blob: e114a6f37be6b868c2c68b77d3cb0646360e6ea9 [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/view.h"
#include <algorithm>
#include <memory>
#include <utility>
#include "base/command_line.h"
#include "base/containers/adapters.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/message_loop/message_loop.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "third_party/skia/include/core/SkRect.h"
#include "ui/accessibility/ax_action_data.h"
#include "ui/accessibility/ax_enums.h"
#include "ui/base/cursor/cursor.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/base/ime/input_method.h"
#include "ui/compositor/clip_recorder.h"
#include "ui/compositor/compositor.h"
#include "ui/compositor/dip_util.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_animator.h"
#include "ui/compositor/paint_context.h"
#include "ui/compositor/paint_recorder.h"
#include "ui/compositor/transform_recorder.h"
#include "ui/display/screen.h"
#include "ui/events/base_event_utils.h"
#include "ui/events/event_target_iterator.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/angle_conversions.h"
#include "ui/gfx/geometry/point3_f.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/interpolated_transform.h"
#include "ui/gfx/path.h"
#include "ui/gfx/scoped_canvas.h"
#include "ui/gfx/skia_util.h"
#include "ui/gfx/transform.h"
#include "ui/native_theme/native_theme.h"
#include "ui/views/accessibility/view_accessibility.h"
#include "ui/views/background.h"
#include "ui/views/border.h"
#include "ui/views/context_menu_controller.h"
#include "ui/views/drag_controller.h"
#include "ui/views/layout/layout_manager.h"
#include "ui/views/view_observer.h"
#include "ui/views/views_delegate.h"
#include "ui/views/views_switches.h"
#include "ui/views/widget/native_widget_private.h"
#include "ui/views/widget/root_view.h"
#include "ui/views/widget/tooltip_manager.h"
#include "ui/views/widget/widget.h"
#if defined(OS_WIN)
#include "base/win/scoped_gdi_object.h"
#include "ui/native_theme/native_theme_win.h"
#endif
namespace views {
namespace {
#if defined(OS_WIN)
const bool kContextMenuOnMousePress = false;
#else
const bool kContextMenuOnMousePress = true;
#endif
// Default horizontal drag threshold in pixels.
// Same as what gtk uses.
const int kDefaultHorizontalDragThreshold = 8;
// Default vertical drag threshold in pixels.
// Same as what gtk uses.
const int kDefaultVerticalDragThreshold = 8;
// Returns the top view in |view|'s hierarchy.
const View* GetHierarchyRoot(const View* view) {
const View* root = view;
while (root && root->parent())
root = root->parent();
return root;
}
} // namespace
namespace internal {
#if DCHECK_IS_ON()
class ScopedChildrenLock {
public:
explicit ScopedChildrenLock(const View* view)
: reset_(&view->iterating_, true) {}
~ScopedChildrenLock() {}
private:
base::AutoReset<bool> reset_;
DISALLOW_COPY_AND_ASSIGN(ScopedChildrenLock);
};
#else
class ScopedChildrenLock {
public:
explicit ScopedChildrenLock(const View* view) {}
~ScopedChildrenLock() {}
};
#endif
} // namespace internal
// static
const char View::kViewClassName[] = "View";
////////////////////////////////////////////////////////////////////////////////
// View, public:
// Creation and lifetime -------------------------------------------------------
View::View()
: owned_by_client_(false),
id_(0),
group_(-1),
parent_(NULL),
#if DCHECK_IS_ON()
iterating_(false),
#endif
can_process_events_within_subtree_(true),
visible_(true),
enabled_(true),
notify_enter_exit_on_child_(false),
registered_for_visible_bounds_notification_(false),
needs_layout_(true),
snap_layer_to_pixel_boundary_(false),
flip_canvas_on_paint_for_rtl_ui_(false),
paint_to_layer_(false),
accelerator_focus_manager_(NULL),
registered_accelerator_count_(0),
next_focusable_view_(NULL),
previous_focusable_view_(NULL),
focus_behavior_(FocusBehavior::NEVER),
context_menu_controller_(NULL),
drag_controller_(NULL) {
SetTargetHandler(this);
}
View::~View() {
if (parent_)
parent_->RemoveChildView(this);
{
internal::ScopedChildrenLock lock(this);
for (auto* child : children_) {
child->parent_ = NULL;
if (!child->owned_by_client_)
delete child;
}
}
for (ViewObserver& observer : observers_)
observer.OnViewIsDeleting(this);
}
// Tree operations -------------------------------------------------------------
const Widget* View::GetWidget() const {
// The root view holds a reference to this view hierarchy's Widget.
return parent_ ? parent_->GetWidget() : NULL;
}
Widget* View::GetWidget() {
return const_cast<Widget*>(const_cast<const View*>(this)->GetWidget());
}
void View::AddChildView(View* view) {
if (view->parent_ == this)
return;
AddChildViewAt(view, child_count());
}
void View::AddChildViewAt(View* view, int index) {
CHECK_NE(view, this) << "You cannot add a view as its own child";
DCHECK_GE(index, 0);
DCHECK_LE(index, child_count());
// If |view| has a parent, remove it from its parent.
View* parent = view->parent_;
ui::NativeTheme* old_theme = nullptr;
Widget* old_widget = nullptr;
if (parent) {
old_theme = view->GetNativeTheme();
old_widget = view->GetWidget();
if (parent == this) {
ReorderChildView(view, index);
return;
}
parent->DoRemoveChildView(view, true, true, false, this);
}
// Sets the prev/next focus views.
InitFocusSiblings(view, index);
view->parent_ = this;
#if DCHECK_IS_ON()
DCHECK(!iterating_);
#endif
children_.insert(children_.begin() + index, view);
// Ensure the layer tree matches the view tree before calling to any client
// code. This way if client code further modifies the view tree we are in a
// sane state.
const bool did_reparent_any_layers = view->UpdateParentLayers();
Widget* widget = GetWidget();
if (did_reparent_any_layers && widget)
widget->LayerTreeChanged();
ReorderLayers();
// Make sure the visibility of the child layers are correct.
// If any of the parent View is hidden, then the layers of the subtree
// rooted at |this| should be hidden. Otherwise, all the child layers should
// inherit the visibility of the owner View.
view->UpdateLayerVisibility();
if (widget) {
const ui::NativeTheme* new_theme = view->GetNativeTheme();
if (new_theme != old_theme)
view->PropagateNativeThemeChanged(new_theme);
}
ViewHierarchyChangedDetails details(true, this, view, parent);
for (View* v = this; v; v = v->parent_)
v->ViewHierarchyChangedImpl(false, details);
view->PropagateAddNotifications(details, widget && widget != old_widget);
UpdateTooltip();
if (widget) {
RegisterChildrenForVisibleBoundsNotification(view);
if (view->visible())
view->SchedulePaint();
}
if (layout_manager_.get())
layout_manager_->ViewAdded(this, view);
for (ViewObserver& observer : observers_)
observer.OnChildViewAdded(this, view);
}
void View::ReorderChildView(View* view, int index) {
DCHECK_EQ(view->parent_, this);
if (index < 0)
index = child_count() - 1;
else if (index >= child_count())
return;
if (children_[index] == view)
return;
const Views::iterator i(std::find(children_.begin(), children_.end(), view));
DCHECK(i != children_.end());
#if DCHECK_IS_ON()
DCHECK(!iterating_);
#endif
children_.erase(i);
// Unlink the view first
View* next_focusable = view->next_focusable_view_;
View* prev_focusable = view->previous_focusable_view_;
if (prev_focusable)
prev_focusable->next_focusable_view_ = next_focusable;
if (next_focusable)
next_focusable->previous_focusable_view_ = prev_focusable;
// Add it in the specified index now.
InitFocusSiblings(view, index);
children_.insert(children_.begin() + index, view);
for (ViewObserver& observer : observers_)
observer.OnChildViewReordered(this, view);
ReorderLayers();
}
void View::RemoveChildView(View* view) {
DoRemoveChildView(view, true, true, false, NULL);
}
void View::RemoveAllChildViews(bool delete_children) {
while (!children_.empty())
DoRemoveChildView(children_.front(), false, false, delete_children, NULL);
UpdateTooltip();
}
bool View::Contains(const View* view) const {
for (const View* v = view; v; v = v->parent_) {
if (v == this)
return true;
}
return false;
}
int View::GetIndexOf(const View* view) const {
Views::const_iterator i(std::find(children_.begin(), children_.end(), view));
return i != children_.end() ? static_cast<int>(i - children_.begin()) : -1;
}
// Size and disposition --------------------------------------------------------
void View::SetBounds(int x, int y, int width, int height) {
SetBoundsRect(gfx::Rect(x, y, std::max(0, width), std::max(0, height)));
}
void View::SetBoundsRect(const gfx::Rect& bounds) {
if (bounds == bounds_) {
if (needs_layout_) {
needs_layout_ = false;
Layout();
}
return;
}
if (visible_) {
// Paint where the view is currently.
SchedulePaintBoundsChanged(
bounds_.size() == bounds.size() ? SCHEDULE_PAINT_SIZE_SAME :
SCHEDULE_PAINT_SIZE_CHANGED);
}
gfx::Rect prev = bounds_;
bounds_ = bounds;
BoundsChanged(prev);
for (ViewObserver& observer : observers_)
observer.OnViewBoundsChanged(this);
}
void View::SetSize(const gfx::Size& size) {
SetBounds(x(), y(), size.width(), size.height());
}
void View::SetPosition(const gfx::Point& position) {
SetBounds(position.x(), position.y(), width(), height());
}
void View::SetX(int x) {
SetBounds(x, y(), width(), height());
}
void View::SetY(int y) {
SetBounds(x(), y, width(), height());
}
gfx::Rect View::GetContentsBounds() const {
gfx::Rect contents_bounds(GetLocalBounds());
if (border_.get())
contents_bounds.Inset(border_->GetInsets());
return contents_bounds;
}
gfx::Rect View::GetLocalBounds() const {
return gfx::Rect(size());
}
gfx::Insets View::GetInsets() const {
return border_.get() ? border_->GetInsets() : gfx::Insets();
}
gfx::Rect View::GetVisibleBounds() const {
if (!IsDrawn())
return gfx::Rect();
gfx::Rect vis_bounds(GetLocalBounds());
gfx::Rect ancestor_bounds;
const View* view = this;
gfx::Transform transform;
while (view != NULL && !vis_bounds.IsEmpty()) {
transform.ConcatTransform(view->GetTransform());
gfx::Transform translation;
translation.Translate(static_cast<float>(view->GetMirroredX()),
static_cast<float>(view->y()));
transform.ConcatTransform(translation);
vis_bounds = view->ConvertRectToParent(vis_bounds);
const View* ancestor = view->parent_;
if (ancestor != NULL) {
ancestor_bounds.SetRect(0, 0, ancestor->width(), ancestor->height());
vis_bounds.Intersect(ancestor_bounds);
} else if (!view->GetWidget()) {
// If the view has no Widget, we're not visible. Return an empty rect.
return gfx::Rect();
}
view = ancestor;
}
if (vis_bounds.IsEmpty())
return vis_bounds;
// Convert back to this views coordinate system.
gfx::RectF views_vis_bounds(vis_bounds);
transform.TransformRectReverse(&views_vis_bounds);
// Partially visible pixels should be considered visible.
return gfx::ToEnclosingRect(views_vis_bounds);
}
gfx::Rect View::GetBoundsInScreen() const {
gfx::Point origin;
View::ConvertPointToScreen(this, &origin);
return gfx::Rect(origin, size());
}
gfx::Size View::GetPreferredSize() const {
if (preferred_size_)
return *preferred_size_;
return CalculatePreferredSize();
}
int View::GetBaseline() const {
return -1;
}
void View::SetPreferredSize(const gfx::Size& size) {
if (preferred_size_ && *preferred_size_ == size)
return;
preferred_size_ = size;
PreferredSizeChanged();
}
void View::SizeToPreferredSize() {
gfx::Size prefsize = GetPreferredSize();
if ((prefsize.width() != width()) || (prefsize.height() != height()))
SetBounds(x(), y(), prefsize.width(), prefsize.height());
}
gfx::Size View::GetMinimumSize() const {
return GetPreferredSize();
}
gfx::Size View::GetMaximumSize() const {
return gfx::Size();
}
int View::GetHeightForWidth(int w) const {
if (layout_manager_.get())
return layout_manager_->GetPreferredHeightForWidth(this, w);
return GetPreferredSize().height();
}
void View::SetVisible(bool visible) {
if (visible != visible_) {
// If the View is currently visible, schedule paint to refresh parent.
// TODO(beng): not sure we should be doing this if we have a layer.
if (visible_)
SchedulePaint();
visible_ = visible;
AdvanceFocusIfNecessary();
// Notify the parent.
if (parent_) {
parent_->ChildVisibilityChanged(this);
parent_->NotifyAccessibilityEvent(ui::AX_EVENT_CHILDREN_CHANGED, false);
}
for (ViewObserver& observer : observers_)
observer.OnViewVisibilityChanged(this);
// This notifies all sub-views recursively.
PropagateVisibilityNotifications(this, visible_);
UpdateLayerVisibility();
// If we are newly visible, schedule paint.
if (visible_)
SchedulePaint();
}
}
bool View::IsDrawn() const {
return visible_ && parent_ ? parent_->IsDrawn() : false;
}
void View::SetEnabled(bool enabled) {
if (enabled != enabled_) {
enabled_ = enabled;
AdvanceFocusIfNecessary();
OnEnabledChanged();
for (ViewObserver& observer : observers_)
observer.OnViewEnabledChanged(this);
}
}
void View::OnEnabledChanged() {
SchedulePaint();
}
View::Views View::GetChildrenInZOrder() {
return children_;
}
// Transformations -------------------------------------------------------------
gfx::Transform View::GetTransform() const {
if (!layer())
return gfx::Transform();
gfx::Transform transform = layer()->transform();
gfx::ScrollOffset scroll_offset = layer()->CurrentScrollOffset();
transform.Translate(-scroll_offset.x(), -scroll_offset.y());
return transform;
}
void View::SetTransform(const gfx::Transform& transform) {
if (transform.IsIdentity()) {
if (layer()) {
layer()->SetTransform(transform);
if (!paint_to_layer_)
DestroyLayer();
} else {
// Nothing.
}
} else {
if (!layer())
CreateLayer(ui::LAYER_TEXTURED);
layer()->SetTransform(transform);
layer()->ScheduleDraw();
}
}
void View::SetPaintToLayer(ui::LayerType layer_type) {
if (paint_to_layer_ && (layer()->type() == layer_type))
return;
DestroyLayerImpl(LayerChangeNotifyBehavior::DONT_NOTIFY);
CreateLayer(layer_type);
paint_to_layer_ = true;
// Notify the parent chain about the layer change.
NotifyParentsOfLayerChange();
}
void View::DestroyLayer() {
DestroyLayerImpl(LayerChangeNotifyBehavior::NOTIFY);
}
std::unique_ptr<ui::Layer> View::RecreateLayer() {
std::unique_ptr<ui::Layer> old_layer = LayerOwner::RecreateLayer();
Widget* widget = GetWidget();
if (widget)
widget->LayerTreeChanged();
return old_layer;
}
// RTL positioning -------------------------------------------------------------
gfx::Rect View::GetMirroredBounds() const {
gfx::Rect bounds(bounds_);
bounds.set_x(GetMirroredX());
return bounds;
}
gfx::Point View::GetMirroredPosition() const {
return gfx::Point(GetMirroredX(), y());
}
int View::GetMirroredX() const {
return parent_ ? parent_->GetMirroredXForRect(bounds_) : x();
}
int View::GetMirroredXForRect(const gfx::Rect& rect) const {
return base::i18n::IsRTL() ? (width() - rect.x() - rect.width()) : rect.x();
}
gfx::Rect View::GetMirroredRect(const gfx::Rect& rect) const {
gfx::Rect mirrored_rect = rect;
mirrored_rect.set_x(GetMirroredXForRect(rect));
return mirrored_rect;
}
int View::GetMirroredXInView(int x) const {
return base::i18n::IsRTL() ? width() - x : x;
}
int View::GetMirroredXWithWidthInView(int x, int w) const {
return base::i18n::IsRTL() ? width() - x - w : x;
}
// Layout ----------------------------------------------------------------------
void View::Layout() {
needs_layout_ = false;
// If we have a layout manager, let it handle the layout for us.
if (layout_manager_.get())
layout_manager_->Layout(this);
// Make sure to propagate the Layout() call to any children that haven't
// received it yet through the layout manager and need to be laid out. This
// is needed for the case when the child requires a layout but its bounds
// weren't changed by the layout manager. If there is no layout manager, we
// just propagate the Layout() call down the hierarchy, so whoever receives
// the call can take appropriate action.
internal::ScopedChildrenLock lock(this);
for (auto* child : children_) {
if (child->needs_layout_ || !layout_manager_.get()) {
TRACE_EVENT1("views", "View::Layout", "class", child->GetClassName());
child->needs_layout_ = false;
child->Layout();
}
}
}
void View::InvalidateLayout() {
// Always invalidate up. This is needed to handle the case of us already being
// valid, but not our parent.
needs_layout_ = true;
if (parent_)
parent_->InvalidateLayout();
}
LayoutManager* View::GetLayoutManager() const {
return layout_manager_.get();
}
void View::SetLayoutManager(std::nullptr_t) {
SetLayoutManagerImpl(nullptr);
}
// Attributes ------------------------------------------------------------------
const char* View::GetClassName() const {
return kViewClassName;
}
const View* View::GetAncestorWithClassName(const std::string& name) const {
for (const View* view = this; view; view = view->parent_) {
if (!strcmp(view->GetClassName(), name.c_str()))
return view;
}
return NULL;
}
View* View::GetAncestorWithClassName(const std::string& name) {
return const_cast<View*>(const_cast<const View*>(this)->
GetAncestorWithClassName(name));
}
const View* View::GetViewByID(int id) const {
if (id == id_)
return const_cast<View*>(this);
internal::ScopedChildrenLock lock(this);
for (auto* child : children_) {
const View* view = child->GetViewByID(id);
if (view)
return view;
}
return NULL;
}
View* View::GetViewByID(int id) {
return const_cast<View*>(const_cast<const View*>(this)->GetViewByID(id));
}
void View::SetGroup(int gid) {
// Don't change the group id once it's set.
DCHECK(group_ == -1 || group_ == gid);
group_ = gid;
}
int View::GetGroup() const {
return group_;
}
bool View::IsGroupFocusTraversable() const {
return true;
}
void View::GetViewsInGroup(int group, Views* views) {
if (group_ == group)
views->push_back(this);
internal::ScopedChildrenLock lock(this);
for (auto* child : children_)
child->GetViewsInGroup(group, views);
}
View* View::GetSelectedViewForGroup(int group) {
Views views;
GetWidget()->GetRootView()->GetViewsInGroup(group, &views);
return views.empty() ? NULL : views[0];
}
// Coordinate conversion -------------------------------------------------------
// static
void View::ConvertPointToTarget(const View* source,
const View* target,
gfx::Point* point) {
DCHECK(source);
DCHECK(target);
if (source == target)
return;
const View* root = GetHierarchyRoot(target);
CHECK_EQ(GetHierarchyRoot(source), root);
if (source != root)
source->ConvertPointForAncestor(root, point);
if (target != root)
target->ConvertPointFromAncestor(root, point);
}
// static
void View::ConvertRectToTarget(const View* source,
const View* target,
gfx::RectF* rect) {
DCHECK(source);
DCHECK(target);
if (source == target)
return;
const View* root = GetHierarchyRoot(target);
CHECK_EQ(GetHierarchyRoot(source), root);
if (source != root)
source->ConvertRectForAncestor(root, rect);
if (target != root)
target->ConvertRectFromAncestor(root, rect);
}
// static
void View::ConvertPointToWidget(const View* src, gfx::Point* p) {
DCHECK(src);
DCHECK(p);
src->ConvertPointForAncestor(NULL, p);
}
// static
void View::ConvertPointFromWidget(const View* dest, gfx::Point* p) {
DCHECK(dest);
DCHECK(p);
dest->ConvertPointFromAncestor(NULL, p);
}
// static
void View::ConvertPointToScreen(const View* src, gfx::Point* p) {
DCHECK(src);
DCHECK(p);
// If the view is not connected to a tree, there's nothing we can do.
const Widget* widget = src->GetWidget();
if (widget) {
ConvertPointToWidget(src, p);
*p += widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
}
}
// static
void View::ConvertPointFromScreen(const View* dst, gfx::Point* p) {
DCHECK(dst);
DCHECK(p);
const views::Widget* widget = dst->GetWidget();
if (!widget)
return;
*p -= widget->GetClientAreaBoundsInScreen().OffsetFromOrigin();
ConvertPointFromWidget(dst, p);
}
// static
void View::ConvertRectToScreen(const View* src, gfx::Rect* rect) {
DCHECK(src);
DCHECK(rect);
gfx::Point new_origin = rect->origin();
views::View::ConvertPointToScreen(src, &new_origin);
rect->set_origin(new_origin);
}
gfx::Rect View::ConvertRectToParent(const gfx::Rect& rect) const {
gfx::RectF x_rect = gfx::RectF(rect);
GetTransform().TransformRect(&x_rect);
x_rect.Offset(GetMirroredPosition().OffsetFromOrigin());
// Pixels we partially occupy in the parent should be included.
return gfx::ToEnclosingRect(x_rect);
}
gfx::Rect View::ConvertRectToWidget(const gfx::Rect& rect) const {
gfx::Rect x_rect = rect;
for (const View* v = this; v; v = v->parent_)
x_rect = v->ConvertRectToParent(x_rect);
return x_rect;
}
// Painting --------------------------------------------------------------------
void View::SchedulePaint() {
SchedulePaintInRect(GetLocalBounds());
}
void View::SchedulePaintInRect(const gfx::Rect& rect) {
if (!visible_)
return;
if (layer()) {
layer()->SchedulePaint(rect);
} else if (parent_) {
// Translate the requested paint rect to the parent's coordinate system
// then pass this notification up to the parent.
parent_->SchedulePaintInRect(ConvertRectToParent(rect));
}
}
void View::Paint(const PaintInfo& parent_paint_info) {
if (!ShouldPaint())
return;
const gfx::Rect& parent_bounds =
!parent() ? GetMirroredBounds() : parent()->GetMirroredBounds();
PaintInfo paint_info = PaintInfo::CreateChildPaintInfo(
parent_paint_info, GetMirroredBounds(), parent_bounds.size(),
GetPaintScaleType(), !!layer());
const ui::PaintContext& context = paint_info.context();
bool is_invalidated = true;
if (paint_info.context().CanCheckInvalid()) {
#if DCHECK_IS_ON()
if (!context.is_pixel_canvas()) {
gfx::Vector2d offset;
context.Visited(this);
View* view = this;
while (view->parent() && !view->layer()) {
DCHECK(view->GetTransform().IsIdentity());
offset += view->GetMirroredPosition().OffsetFromOrigin();
view = view->parent();
}
// The offset in the PaintContext should be the offset up to the paint
// root, which we compute and verify here.
DCHECK_EQ(context.PaintOffset().x(), offset.x());
DCHECK_EQ(context.PaintOffset().y(), offset.y());
// The above loop will stop when |view| is the paint root, which should be
// the root of the current paint walk, as verified by storing the root in
// the PaintContext.
DCHECK_EQ(context.RootVisited(), view);
}
#endif
// If the View wasn't invalidated, don't waste time painting it, the output
// would be culled.
is_invalidated =
context.IsRectInvalid(gfx::Rect(paint_info.paint_recording_size()));
}
TRACE_EVENT1("views", "View::Paint", "class", GetClassName());
// If the view is backed by a layer, it should paint with itself as the origin
// rather than relative to its parent.
// TODO(danakj): Rework clip and transform recorder usage here to use
// std::optional once we can do so.
ui::ClipRecorder clip_recorder(parent_paint_info.context());
if (!layer()) {
// Set the clip rect to the bounds of this View, or |clip_path_| if it's
// been set. Note that the X (or left) position we pass to ClipRect takes
// into consideration whether or not the View uses a right-to-left layout so
// that we paint the View in its mirrored position if need be.
if (clip_path_.isEmpty()) {
clip_recorder.ClipRect(gfx::Rect(paint_info.paint_recording_size()) +
paint_info.offset_from_parent());
} else {
gfx::Path clip_path_in_parent = clip_path_;
// Transform |clip_path_| from local space to parent recording space.
gfx::Transform to_parent_recording_space;
to_parent_recording_space.Translate(paint_info.offset_from_parent());
to_parent_recording_space.Scale(
SkFloatToScalar(paint_info.paint_recording_scale_x()),
SkFloatToScalar(paint_info.paint_recording_scale_y()));
clip_path_in_parent.transform(to_parent_recording_space.matrix());
clip_recorder.ClipPathWithAntiAliasing(clip_path_in_parent);
}
}
ui::TransformRecorder transform_recorder(context);
SetupTransformRecorderForPainting(paint_info.offset_from_parent(),
&transform_recorder);
// Note that the cache is not aware of the offset of the view
// relative to the parent since painting is always done relative to
// the top left of the individual view.
if (is_invalidated ||
!paint_cache_.UseCache(context, paint_info.paint_recording_size())) {
ui::PaintRecorder recorder(context, paint_info.paint_recording_size(),
paint_info.paint_recording_scale_x(),
paint_info.paint_recording_scale_y(),
&paint_cache_);
gfx::Canvas* canvas = recorder.canvas();
gfx::ScopedRTLFlipCanvas scoped_canvas(canvas, width(),
flip_canvas_on_paint_for_rtl_ui_);
// Delegate painting the contents of the View to the virtual OnPaint method.
OnPaint(canvas);
}
// View::Paint() recursion over the subtree.
PaintChildren(paint_info);
}
void View::SetBackground(std::unique_ptr<Background> b) {
background_ = std::move(b);
}
void View::SetBorder(std::unique_ptr<Border> b) {
border_ = std::move(b);
}
const ui::ThemeProvider* View::GetThemeProvider() const {
const Widget* widget = GetWidget();
return widget ? widget->GetThemeProvider() : nullptr;
}
const ui::NativeTheme* View::GetNativeTheme() const {
if (native_theme_)
return native_theme_;
if (parent())
return parent()->GetNativeTheme();
const Widget* widget = GetWidget();
if (widget)
return widget->GetNativeTheme();
return ui::NativeTheme::GetInstanceForNativeUi();
}
void View::SetNativeTheme(ui::NativeTheme* theme) {
ui::NativeTheme* original_native_theme = GetNativeTheme();
native_theme_ = theme;
if (native_theme_ != original_native_theme)
PropagateNativeThemeChanged(theme);
}
// RTL painting ----------------------------------------------------------------
void View::EnableCanvasFlippingForRTLUI(bool enable) {
flip_canvas_on_paint_for_rtl_ui_ = enable;
}
// Input -----------------------------------------------------------------------
View* View::GetEventHandlerForPoint(const gfx::Point& point) {
return GetEventHandlerForRect(gfx::Rect(point, gfx::Size(1, 1)));
}
View* View::GetEventHandlerForRect(const gfx::Rect& rect) {
return GetEffectiveViewTargeter()->TargetForRect(this, rect);
}
bool View::CanProcessEventsWithinSubtree() const {
return can_process_events_within_subtree_;
}
View* View::GetTooltipHandlerForPoint(const gfx::Point& point) {
// TODO(tdanderson): Move this implementation into ViewTargetDelegate.
if (!HitTestPoint(point) || !CanProcessEventsWithinSubtree())
return NULL;
// Walk the child Views recursively looking for the View that most
// tightly encloses the specified point.
View::Views children = GetChildrenInZOrder();
DCHECK_EQ(child_count(), static_cast<int>(children.size()));
for (auto* child : base::Reversed(children)) {
if (!child->visible())
continue;
gfx::Point point_in_child_coords(point);
ConvertPointToTarget(this, child, &point_in_child_coords);
View* handler = child->GetTooltipHandlerForPoint(point_in_child_coords);
if (handler)
return handler;
}
return this;
}
gfx::NativeCursor View::GetCursor(const ui::MouseEvent& event) {
#if defined(OS_WIN)
static ui::Cursor arrow;
if (!arrow.platform())
arrow.SetPlatformCursor(LoadCursor(NULL, IDC_ARROW));
return arrow;
#else
return gfx::kNullCursor;
#endif
}
bool View::HitTestPoint(const gfx::Point& point) const {
return HitTestRect(gfx::Rect(point, gfx::Size(1, 1)));
}
bool View::HitTestRect(const gfx::Rect& rect) const {
return GetEffectiveViewTargeter()->DoesIntersectRect(this, rect);
}
bool View::IsMouseHovered() const {
// If we haven't yet been placed in an onscreen view hierarchy, we can't be
// hovered.
if (!GetWidget())
return false;
// If mouse events are disabled, then the mouse cursor is invisible and
// is therefore not hovering over this button.
if (!GetWidget()->IsMouseEventsEnabled())
return false;
gfx::Point cursor_pos(display::Screen::GetScreen()->GetCursorScreenPoint());
ConvertPointFromScreen(this, &cursor_pos);
return HitTestPoint(cursor_pos);
}
bool View::OnMousePressed(const ui::MouseEvent& event) {
return false;
}
bool View::OnMouseDragged(const ui::MouseEvent& event) {
return false;
}
void View::OnMouseReleased(const ui::MouseEvent& event) {
}
void View::OnMouseCaptureLost() {
}
void View::OnMouseMoved(const ui::MouseEvent& event) {
}
void View::OnMouseEntered(const ui::MouseEvent& event) {
}
void View::OnMouseExited(const ui::MouseEvent& event) {
}
void View::SetMouseHandler(View* new_mouse_handler) {
// |new_mouse_handler| may be NULL.
if (parent_)
parent_->SetMouseHandler(new_mouse_handler);
}
bool View::OnKeyPressed(const ui::KeyEvent& event) {
return false;
}
bool View::OnKeyReleased(const ui::KeyEvent& event) {
return false;
}
bool View::OnMouseWheel(const ui::MouseWheelEvent& event) {
return false;
}
void View::OnKeyEvent(ui::KeyEvent* event) {
bool consumed = (event->type() == ui::ET_KEY_PRESSED) ? OnKeyPressed(*event) :
OnKeyReleased(*event);
if (consumed)
event->StopPropagation();
}
void View::OnMouseEvent(ui::MouseEvent* event) {
switch (event->type()) {
case ui::ET_MOUSE_PRESSED:
if (ProcessMousePressed(*event))
event->SetHandled();
return;
case ui::ET_MOUSE_MOVED:
if ((event->flags() & (ui::EF_LEFT_MOUSE_BUTTON |
ui::EF_RIGHT_MOUSE_BUTTON |
ui::EF_MIDDLE_MOUSE_BUTTON)) == 0) {
OnMouseMoved(*event);
return;
}
// FALL-THROUGH
case ui::ET_MOUSE_DRAGGED:
if (ProcessMouseDragged(*event))
event->SetHandled();
return;
case ui::ET_MOUSE_RELEASED:
ProcessMouseReleased(*event);
return;
case ui::ET_MOUSEWHEEL:
if (OnMouseWheel(*event->AsMouseWheelEvent()))
event->SetHandled();
break;
case ui::ET_MOUSE_ENTERED:
if (event->flags() & ui::EF_TOUCH_ACCESSIBILITY)
NotifyAccessibilityEvent(ui::AX_EVENT_HOVER, true);
OnMouseEntered(*event);
break;
case ui::ET_MOUSE_EXITED:
OnMouseExited(*event);
break;
default:
return;
}
}
void View::OnScrollEvent(ui::ScrollEvent* event) {
}
void View::OnTouchEvent(ui::TouchEvent* event) {
NOTREACHED() << "Views should not receive touch events.";
}
void View::OnGestureEvent(ui::GestureEvent* event) {
}
const ui::InputMethod* View::GetInputMethod() const {
Widget* widget = const_cast<Widget*>(GetWidget());
return widget ? const_cast<const ui::InputMethod*>(widget->GetInputMethod())
: nullptr;
}
std::unique_ptr<ViewTargeter> View::SetEventTargeter(
std::unique_ptr<ViewTargeter> targeter) {
std::unique_ptr<ViewTargeter> old_targeter = std::move(targeter_);
targeter_ = std::move(targeter);
return old_targeter;
}
ViewTargeter* View::GetEffectiveViewTargeter() const {
DCHECK(GetWidget());
ViewTargeter* view_targeter = targeter();
if (!view_targeter)
view_targeter = GetWidget()->GetRootView()->targeter();
CHECK(view_targeter);
return view_targeter;
}
WordLookupClient* View::GetWordLookupClient() {
return nullptr;
}
bool View::CanAcceptEvent(const ui::Event& event) {
return IsDrawn();
}
ui::EventTarget* View::GetParentTarget() {
return parent_;
}
std::unique_ptr<ui::EventTargetIterator> View::GetChildIterator() const {
return std::make_unique<ui::EventTargetIteratorPtrImpl<View>>(children_);
}
ui::EventTargeter* View::GetEventTargeter() {
return targeter_.get();
}
void View::ConvertEventToTarget(ui::EventTarget* target,
ui::LocatedEvent* event) {
event->ConvertLocationToTarget(this, static_cast<View*>(target));
}
// Accelerators ----------------------------------------------------------------
void View::AddAccelerator(const ui::Accelerator& accelerator) {
if (!accelerators_.get())
accelerators_.reset(new std::vector<ui::Accelerator>());
if (!base::ContainsValue(*accelerators_.get(), accelerator))
accelerators_->push_back(accelerator);
RegisterPendingAccelerators();
}
void View::RemoveAccelerator(const ui::Accelerator& accelerator) {
if (!accelerators_.get()) {
NOTREACHED() << "Removing non-existing accelerator";
return;
}
std::vector<ui::Accelerator>::iterator i(
std::find(accelerators_->begin(), accelerators_->end(), accelerator));
if (i == accelerators_->end()) {
NOTREACHED() << "Removing non-existing accelerator";
return;
}
size_t index = i - accelerators_->begin();
accelerators_->erase(i);
if (index >= registered_accelerator_count_) {
// The accelerator is not registered to FocusManager.
return;
}
--registered_accelerator_count_;
// Providing we are attached to a Widget and registered with a focus manager,
// we should de-register from that focus manager now.
if (GetWidget() && accelerator_focus_manager_)
accelerator_focus_manager_->UnregisterAccelerator(accelerator, this);
}
void View::ResetAccelerators() {
if (accelerators_.get())
UnregisterAccelerators(false);
}
bool View::AcceleratorPressed(const ui::Accelerator& accelerator) {
return false;
}
bool View::CanHandleAccelerators() const {
const Widget* widget = GetWidget();
if (!enabled() || !IsDrawn() || !widget || !widget->IsVisible())
return false;
#if defined(USE_AURA) && !defined(OS_CHROMEOS)
// Non-ChromeOS aura windows have an associated FocusManagerEventHandler which
// adds currently focused view as an event PreTarget (see
// DesktopNativeWidgetAura::InitNativeWidget). However, the focused view isn't
// always the right view to handle accelerators: It should only handle them
// when active. Only top level widgets can be active, so for child widgets
// check if they are focused instead. ChromeOS also behaves different than
// Linux when an extension popup is about to handle the accelerator.
bool child = widget && widget->GetTopLevelWidget() != widget;
bool focus_in_child =
widget &&
widget->GetRootView()->Contains(GetFocusManager()->GetFocusedView());
if ((child && !focus_in_child) || (!child && !widget->IsActive()))
return false;
#endif
return true;
}
// Focus -----------------------------------------------------------------------
bool View::HasFocus() const {
const FocusManager* focus_manager = GetFocusManager();
return focus_manager && (focus_manager->GetFocusedView() == this);
}
View* View::GetNextFocusableView() {
return next_focusable_view_;
}
const View* View::GetNextFocusableView() const {
return next_focusable_view_;
}
View* View::GetPreviousFocusableView() {
return previous_focusable_view_;
}
void View::SetNextFocusableView(View* view) {
if (view)
view->previous_focusable_view_ = this;
next_focusable_view_ = view;
}
void View::SetFocusBehavior(FocusBehavior focus_behavior) {
if (focus_behavior_ == focus_behavior)
return;
focus_behavior_ = focus_behavior;
AdvanceFocusIfNecessary();
}
bool View::IsFocusable() const {
return focus_behavior_ == FocusBehavior::ALWAYS && enabled_ && IsDrawn();
}
bool View::IsAccessibilityFocusable() const {
return focus_behavior_ != FocusBehavior::NEVER && enabled_ && IsDrawn();
}
FocusManager* View::GetFocusManager() {
Widget* widget = GetWidget();
return widget ? widget->GetFocusManager() : NULL;
}
const FocusManager* View::GetFocusManager() const {
const Widget* widget = GetWidget();
return widget ? widget->GetFocusManager() : NULL;
}
void View::RequestFocus() {
FocusManager* focus_manager = GetFocusManager();
if (focus_manager) {
bool focusable = focus_manager->keyboard_accessible()
? IsAccessibilityFocusable()
: IsFocusable();
if (focusable)
focus_manager->SetFocusedView(this);
}
}
bool View::SkipDefaultKeyEventProcessing(const ui::KeyEvent& event) {
return false;
}
FocusTraversable* View::GetFocusTraversable() {
return NULL;
}
FocusTraversable* View::GetPaneFocusTraversable() {
return NULL;
}
// Tooltips --------------------------------------------------------------------
bool View::GetTooltipText(const gfx::Point& p, base::string16* tooltip) const {
return false;
}
bool View::GetTooltipTextOrigin(const gfx::Point& p, gfx::Point* loc) const {
return false;
}
// Context menus ---------------------------------------------------------------
void View::ShowContextMenu(const gfx::Point& p,
ui::MenuSourceType source_type) {
if (!context_menu_controller_)
return;
context_menu_controller_->ShowContextMenuForView(this, p, source_type);
}
// static
bool View::ShouldShowContextMenuOnMousePress() {
return kContextMenuOnMousePress;
}
gfx::Point View::GetKeyboardContextMenuLocation() {
gfx::Rect vis_bounds = GetVisibleBounds();
gfx::Point screen_point(vis_bounds.x() + vis_bounds.width() / 2,
vis_bounds.y() + vis_bounds.height() / 2);
ConvertPointToScreen(this, &screen_point);
return screen_point;
}
// Drag and drop ---------------------------------------------------------------
bool View::GetDropFormats(int* formats,
std::set<ui::Clipboard::FormatType>* format_types) {
return false;
}
bool View::AreDropTypesRequired() {
return false;
}
bool View::CanDrop(const OSExchangeData& data) {
// TODO(sky): when I finish up migration, this should default to true.
return false;
}
void View::OnDragEntered(const ui::DropTargetEvent& event) {
}
int View::OnDragUpdated(const ui::DropTargetEvent& event) {
return ui::DragDropTypes::DRAG_NONE;
}
void View::OnDragExited() {
}
int View::OnPerformDrop(const ui::DropTargetEvent& event) {
return ui::DragDropTypes::DRAG_NONE;
}
void View::OnDragDone() {
}
// static
bool View::ExceededDragThreshold(const gfx::Vector2d& delta) {
return (abs(delta.x()) > GetHorizontalDragThreshold() ||
abs(delta.y()) > GetVerticalDragThreshold());
}
// Accessibility----------------------------------------------------------------
ViewAccessibility& View::GetViewAccessibility() {
if (!view_accessibility_)
view_accessibility_ = ViewAccessibility::Create(this);
return *view_accessibility_;
}
bool View::HandleAccessibleAction(const ui::AXActionData& action_data) {
switch (action_data.action) {
case ui::AX_ACTION_BLUR:
if (HasFocus()) {
GetFocusManager()->ClearFocus();
return true;
}
break;
case ui::AX_ACTION_DO_DEFAULT: {
const gfx::Point center = GetLocalBounds().CenterPoint();
OnMousePressed(ui::MouseEvent(
ui::ET_MOUSE_PRESSED, center, center, ui::EventTimeForNow(),
ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON));
OnMouseReleased(ui::MouseEvent(
ui::ET_MOUSE_RELEASED, center, center, ui::EventTimeForNow(),
ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON));
return true;
}
case ui::AX_ACTION_FOCUS:
if (IsAccessibilityFocusable()) {
RequestFocus();
return true;
}
break;
case ui::AX_ACTION_SCROLL_TO_MAKE_VISIBLE:
ScrollRectToVisible(GetLocalBounds());
return true;
case ui::AX_ACTION_SHOW_CONTEXT_MENU:
ShowContextMenu(GetBoundsInScreen().CenterPoint(),
ui::MENU_SOURCE_KEYBOARD);
return true;
default:
// Some actions are handled by subclasses of View.
break;
}
return false;
}
gfx::NativeViewAccessible View::GetNativeViewAccessible() {
return GetViewAccessibility().GetNativeObject();
}
void View::NotifyAccessibilityEvent(
ui::AXEvent event_type,
bool send_native_event) {
if (ViewsDelegate::GetInstance())
ViewsDelegate::GetInstance()->NotifyAccessibilityEvent(this, event_type);
if (send_native_event && GetWidget())
GetViewAccessibility().NotifyAccessibilityEvent(event_type);
OnAccessibilityEvent(event_type);
}
void View::OnAccessibilityEvent(ui::AXEvent event_type) {}
// Scrolling -------------------------------------------------------------------
void View::ScrollRectToVisible(const gfx::Rect& rect) {
// We must take RTL UI mirroring into account when adjusting the position of
// the region.
if (parent_) {
gfx::Rect scroll_rect(rect);
scroll_rect.Offset(GetMirroredX(), y());
parent_->ScrollRectToVisible(scroll_rect);
}
}
void View::ScrollViewToVisible() {
ScrollRectToVisible(GetLocalBounds());
}
int View::GetPageScrollIncrement(ScrollView* scroll_view,
bool is_horizontal, bool is_positive) {
return 0;
}
int View::GetLineScrollIncrement(ScrollView* scroll_view,
bool is_horizontal, bool is_positive) {
return 0;
}
void View::AddObserver(ViewObserver* observer) {
CHECK(observer);
observers_.AddObserver(observer);
}
void View::RemoveObserver(ViewObserver* observer) {
observers_.RemoveObserver(observer);
}
bool View::HasObserver(const ViewObserver* observer) const {
return observers_.HasObserver(observer);
}
////////////////////////////////////////////////////////////////////////////////
// View, protected:
// Size and disposition --------------------------------------------------------
gfx::Size View::CalculatePreferredSize() const {
if (layout_manager_.get())
return layout_manager_->GetPreferredSize(this);
return gfx::Size();
}
void View::OnBoundsChanged(const gfx::Rect& previous_bounds) {
}
void View::PreferredSizeChanged() {
InvalidateLayout();
if (parent_)
parent_->ChildPreferredSizeChanged(this);
for (ViewObserver& observer : observers_)
observer.OnViewPreferredSizeChanged(this);
}
bool View::GetNeedsNotificationWhenVisibleBoundsChange() const {
return false;
}
void View::OnVisibleBoundsChanged() {
}
// Tree operations -------------------------------------------------------------
void View::ViewHierarchyChanged(const ViewHierarchyChangedDetails& details) {
}
void View::VisibilityChanged(View* starting_from, bool is_visible) {
}
void View::NativeViewHierarchyChanged() {
FocusManager* focus_manager = GetFocusManager();
if (accelerator_focus_manager_ != focus_manager) {
UnregisterAccelerators(true);
if (focus_manager)
RegisterPendingAccelerators();
}
}
void View::AddedToWidget() {}
void View::RemovedFromWidget() {}
// Painting --------------------------------------------------------------------
void View::PaintChildren(const PaintInfo& paint_info) {
TRACE_EVENT1("views", "View::PaintChildren", "class", GetClassName());
RecursivePaintHelper(&View::Paint, paint_info);
}
void View::OnPaint(gfx::Canvas* canvas) {
TRACE_EVENT1("views", "View::OnPaint", "class", GetClassName());
OnPaintBackground(canvas);
OnPaintBorder(canvas);
}
void View::OnPaintBackground(gfx::Canvas* canvas) {
if (background_) {
TRACE_EVENT0("views", "View::OnPaintBackground");
background_->Paint(canvas, this);
}
}
void View::OnPaintBorder(gfx::Canvas* canvas) {
if (border_) {
TRACE_EVENT0("views", "View::OnPaintBorder");
border_->Paint(*this, canvas);
}
}
// Accelerated Painting --------------------------------------------------------
View::LayerOffsetData View::CalculateOffsetToAncestorWithLayer(
ui::Layer** layer_parent) {
if (layer()) {
if (layer_parent)
*layer_parent = layer();
return LayerOffsetData(layer()->device_scale_factor());
}
if (!parent_)
return LayerOffsetData();
LayerOffsetData offset_data =
parent_->CalculateOffsetToAncestorWithLayer(layer_parent);
return offset_data + GetMirroredPosition().OffsetFromOrigin();
}
void View::UpdateParentLayer() {
if (!layer())
return;
ui::Layer* parent_layer = NULL;
gfx::Vector2d offset(GetMirroredX(), y());
if (parent_) {
offset +=
parent_->CalculateOffsetToAncestorWithLayer(&parent_layer).offset();
}
ReparentLayer(offset, parent_layer);
}
void View::MoveLayerToParent(ui::Layer* parent_layer,
const LayerOffsetData& offset_data) {
LayerOffsetData local_offset_data(offset_data);
if (parent_layer != layer())
local_offset_data += GetMirroredPosition().OffsetFromOrigin();
if (layer() && parent_layer != layer()) {
parent_layer->Add(layer());
SetLayerBounds(size(), local_offset_data);
} else {
internal::ScopedChildrenLock lock(this);
for (auto* child : GetChildrenInZOrder())
child->MoveLayerToParent(parent_layer, local_offset_data);
}
}
void View::UpdateLayerVisibility() {
bool visible = visible_;
for (const View* v = parent_; visible && v && !v->layer(); v = v->parent_)
visible = v->visible();
UpdateChildLayerVisibility(visible);
}
void View::UpdateChildLayerVisibility(bool ancestor_visible) {
if (layer()) {
layer()->SetVisible(ancestor_visible && visible_);
} else {
internal::ScopedChildrenLock lock(this);
for (auto* child : children_)
child->UpdateChildLayerVisibility(ancestor_visible && visible_);
}
}
void View::DestroyLayerImpl(LayerChangeNotifyBehavior notify_parents) {
if (!paint_to_layer_)
return;
paint_to_layer_ = false;
if (!layer())
return;
ui::Layer* new_parent = layer()->parent();
std::vector<ui::Layer*> children = layer()->children();
for (size_t i = 0; i < children.size(); ++i) {
layer()->Remove(children[i]);
if (new_parent)
new_parent->Add(children[i]);
}
LayerOwner::DestroyLayer();
if (new_parent)
ReorderLayers();
UpdateChildLayerBounds(CalculateOffsetToAncestorWithLayer(NULL));
SchedulePaint();
// Notify the parent chain about the layer change.
if (notify_parents == LayerChangeNotifyBehavior::NOTIFY)
NotifyParentsOfLayerChange();
Widget* widget = GetWidget();
if (widget)
widget->LayerTreeChanged();
}
void View::NotifyParentsOfLayerChange() {
// Notify the parent chain about the layer change.
View* view_parent = parent();
while (view_parent) {
view_parent->OnChildLayerChanged(this);
view_parent = view_parent->parent();
}
}
void View::UpdateChildLayerBounds(const LayerOffsetData& offset_data) {
if (layer()) {
SetLayerBounds(size(), offset_data);
} else {
internal::ScopedChildrenLock lock(this);
for (auto* child : children_) {
child->UpdateChildLayerBounds(
offset_data + child->GetMirroredPosition().OffsetFromOrigin());
}
}
}
void View::OnPaintLayer(const ui::PaintContext& context) {
PaintFromPaintRoot(context);
}
void View::OnDeviceScaleFactorChanged(float old_device_scale_factor,
float new_device_scale_factor) {
snap_layer_to_pixel_boundary_ =
(new_device_scale_factor - std::floor(new_device_scale_factor)) != 0.0f;
if (!layer())
return;
// There can be no subpixel offset if the layer has no parent.
if (!parent() || !layer()->parent())
return;
if (layer()->parent() && layer()->GetCompositor() &&
layer()->GetCompositor()->is_pixel_canvas()) {
LayerOffsetData offset_data(
parent()->CalculateOffsetToAncestorWithLayer(nullptr));
offset_data += GetMirroredPosition().OffsetFromOrigin();
SnapLayerToPixelBoundary(offset_data);
} else {
SnapLayerToPixelBoundary(LayerOffsetData());
}
}
void View::ReorderLayers() {
View* v = this;
while (v && !v->layer())
v = v->parent();
Widget* widget = GetWidget();
if (!v) {
if (widget) {
ui::Layer* layer = widget->GetLayer();
if (layer)
widget->GetRootView()->ReorderChildLayers(layer);
}
} else {
v->ReorderChildLayers(v->layer());
}
if (widget) {
// Reorder the widget's child NativeViews in case a child NativeView is
// associated with a view (eg via a NativeViewHost). Always do the
// reordering because the associated NativeView's layer (if it has one)
// is parented to the widget's layer regardless of whether the host view has
// an ancestor with a layer.
widget->ReorderNativeViews();
}
}
void View::ReorderChildLayers(ui::Layer* parent_layer) {
if (layer() && layer() != parent_layer) {
DCHECK_EQ(parent_layer, layer()->parent());
parent_layer->StackAtBottom(layer());
} else {
// Iterate backwards through the children so that a child with a layer
// which is further to the back is stacked above one which is further to
// the front.
View::Views children = GetChildrenInZOrder();
DCHECK_EQ(child_count(), static_cast<int>(children.size()));
for (auto* child : base::Reversed(children))
child->ReorderChildLayers(parent_layer);
}
}
void View::OnChildLayerChanged(View* child) {}
// Input -----------------------------------------------------------------------
View::DragInfo* View::GetDragInfo() {
return parent_ ? parent_->GetDragInfo() : NULL;
}
// Focus -----------------------------------------------------------------------
void View::OnFocus() {
// TODO(beng): Investigate whether it's possible for us to move this to
// Focus().
// By default, we clear the native focus. This ensures that no visible native
// view as the focus and that we still receive keyboard inputs.
FocusManager* focus_manager = GetFocusManager();
if (focus_manager)
focus_manager->ClearNativeFocus();
// TODO(beng): Investigate whether it's possible for us to move this to
// Focus().
// Notify assistive technologies of the focus change.
NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
}
void View::OnBlur() {
}
void View::Focus() {
OnFocus();
ScrollViewToVisible();
}
void View::Blur() {
OnBlur();
}
// Tooltips --------------------------------------------------------------------
void View::TooltipTextChanged() {
Widget* widget = GetWidget();
// TooltipManager may be null if there is a problem creating it.
if (widget && widget->GetTooltipManager())
widget->GetTooltipManager()->TooltipTextChanged(this);
}
// Drag and drop ---------------------------------------------------------------
int View::GetDragOperations(const gfx::Point& press_pt) {
return drag_controller_ ?
drag_controller_->GetDragOperationsForView(this, press_pt) :
ui::DragDropTypes::DRAG_NONE;
}
void View::WriteDragData(const gfx::Point& press_pt, OSExchangeData* data) {
DCHECK(drag_controller_);
drag_controller_->WriteDragDataForView(this, press_pt, data);
}
bool View::InDrag() const {
const Widget* widget = GetWidget();
return widget ? widget->dragged_view() == this : false;
}
int View::GetHorizontalDragThreshold() {
// TODO(jennyz): This value may need to be adjusted for different platforms
// and for different display density.
return kDefaultHorizontalDragThreshold;
}
int View::GetVerticalDragThreshold() {
// TODO(jennyz): This value may need to be adjusted for different platforms
// and for different display density.
return kDefaultVerticalDragThreshold;
}
PaintInfo::ScaleType View::GetPaintScaleType() const {
return PaintInfo::ScaleType::kScaleWithEdgeSnapping;
}
// Debugging -------------------------------------------------------------------
#if !defined(NDEBUG)
std::string View::PrintViewGraph(bool first) {
return DoPrintViewGraph(first, this);
}
std::string View::DoPrintViewGraph(bool first, View* view_with_children) {
// 64-bit pointer = 16 bytes of hex + "0x" + '\0' = 19.
const size_t kMaxPointerStringLength = 19;
std::string result;
if (first)
result.append("digraph {\n");
// Node characteristics.
char p[kMaxPointerStringLength];
const std::string class_name(GetClassName());
size_t base_name_index = class_name.find_last_of('/');
if (base_name_index == std::string::npos)
base_name_index = 0;
else
base_name_index++;
char bounds_buffer[512];
// Information about current node.
base::snprintf(p, arraysize(bounds_buffer), "%p", view_with_children);
result.append(" N");
result.append(p + 2);
result.append(" [label=\"");
result.append(class_name.substr(base_name_index).c_str());
base::snprintf(bounds_buffer,
arraysize(bounds_buffer),
"\\n bounds: (%d, %d), (%dx%d)",
bounds().x(),
bounds().y(),
bounds().width(),
bounds().height());
result.append(bounds_buffer);
gfx::DecomposedTransform decomp;
if (!GetTransform().IsIdentity() &&
gfx::DecomposeTransform(&decomp, GetTransform())) {
base::snprintf(bounds_buffer,
arraysize(bounds_buffer),
"\\n translation: (%f, %f)",
decomp.translate[0],
decomp.translate[1]);
result.append(bounds_buffer);
base::snprintf(bounds_buffer, arraysize(bounds_buffer),
"\\n rotation: %3.2f",
gfx::RadToDeg(std::acos(decomp.quaternion.w()) * 2));
result.append(bounds_buffer);
base::snprintf(bounds_buffer,
arraysize(bounds_buffer),
"\\n scale: (%2.4f, %2.4f)",
decomp.scale[0],
decomp.scale[1]);
result.append(bounds_buffer);
}
result.append("\"");
if (!parent_)
result.append(", shape=box");
if (layer()) {
if (layer()->has_external_content())
result.append(", color=green");
else
result.append(", color=red");
if (layer()->fills_bounds_opaquely())
result.append(", style=filled");
}
result.append("]\n");
// Link to parent.
if (parent_) {
char pp[kMaxPointerStringLength];
base::snprintf(pp, kMaxPointerStringLength, "%p", parent_);
result.append(" N");
result.append(pp + 2);
result.append(" -> N");
result.append(p + 2);
result.append("\n");
}
// Children.
for (auto* child : view_with_children->children_)
result.append(child->PrintViewGraph(false));
if (first)
result.append("}\n");
return result;
}
#endif
////////////////////////////////////////////////////////////////////////////////
// View, private:
// DropInfo --------------------------------------------------------------------
void View::DragInfo::Reset() {
possible_drag = false;
start_pt = gfx::Point();
}
void View::DragInfo::PossibleDrag(const gfx::Point& p) {
possible_drag = true;
start_pt = p;
}
// Painting --------------------------------------------------------------------
void View::SchedulePaintBoundsChanged(SchedulePaintType type) {
// If we have a layer and the View's size did not change, we do not need to
// schedule any paints since the layer will be redrawn at its new location
// during the next Draw() cycle in the compositor.
if (!layer() || type == SCHEDULE_PAINT_SIZE_CHANGED) {
// Otherwise, if the size changes or we don't have a layer then we need to
// use SchedulePaint to invalidate the area occupied by the View.
SchedulePaint();
} else if (parent_ && type == SCHEDULE_PAINT_SIZE_SAME) {
// The compositor doesn't Draw() until something on screen changes, so
// if our position changes but nothing is being animated on screen, then
// tell the compositor to redraw the scene. We know layer() exists due to
// the above if clause.
layer()->ScheduleDraw();
}
}
void View::SchedulePaintOnParent() {
if (parent_) {
// Translate the requested paint rect to the parent's coordinate system
// then pass this notification up to the parent.
parent_->SchedulePaintInRect(ConvertRectToParent(GetLocalBounds()));
}
}
bool View::ShouldPaint() const {
return visible_ && !size().IsEmpty();
}
void View::SetupTransformRecorderForPainting(
const gfx::Vector2d& offset_from_parent,
ui::TransformRecorder* recorder) const {
// If the view is backed by a layer, it should paint with itself as the origin
// rather than relative to its parent.
if (layer())
return;
// Translate the graphics such that 0,0 corresponds to where this View is
// located relative to its parent.
gfx::Transform transform_from_parent;
transform_from_parent.Translate(offset_from_parent.x(),
offset_from_parent.y());
recorder->Transform(transform_from_parent);
}
void View::RecursivePaintHelper(void (View::*func)(const PaintInfo&),
const PaintInfo& info) {
View::Views children = GetChildrenInZOrder();
DCHECK_EQ(child_count(), static_cast<int>(children.size()));
for (auto* child : children) {
if (!child->layer())
(child->*func)(info);
}
}
void View::PaintFromPaintRoot(const ui::PaintContext& parent_context) {
PaintInfo paint_info = PaintInfo::CreateRootPaintInfo(
parent_context, layer() ? layer()->size() : size());
Paint(paint_info);
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDrawViewBoundsRects))
PaintDebugRects(paint_info);
}
void View::PaintDebugRects(const PaintInfo& parent_paint_info) {
if (!ShouldPaint())
return;
const gfx::Rect& parent_bounds = (layer() || !parent())
? GetMirroredBounds()
: parent()->GetMirroredBounds();
PaintInfo paint_info = PaintInfo::CreateChildPaintInfo(
parent_paint_info, GetMirroredBounds(), parent_bounds.size(),
GetPaintScaleType(), !!layer());
const ui::PaintContext& context = paint_info.context();
ui::TransformRecorder transform_recorder(context);
SetupTransformRecorderForPainting(paint_info.offset_from_parent(),
&transform_recorder);
RecursivePaintHelper(&View::PaintDebugRects, paint_info);
// Draw outline rects for debugging.
ui::PaintRecorder recorder(context, paint_info.paint_recording_size(),
paint_info.paint_recording_scale_x(),
paint_info.paint_recording_scale_y(),
&paint_cache_);
gfx::Canvas* canvas = recorder.canvas();
const float scale = canvas->UndoDeviceScaleFactor();
gfx::RectF outline_rect(ScaleToEnclosedRect(GetLocalBounds(), scale));
gfx::RectF content_outline_rect(
ScaleToEnclosedRect(GetContentsBounds(), scale));
if (content_outline_rect != outline_rect) {
content_outline_rect.Inset(0.5f, 0.5f);
const SkColor content_color = SkColorSetARGB(0x30, 0, 0, 0xff);
canvas->DrawRect(content_outline_rect, content_color);
}
outline_rect.Inset(0.5f, 0.5f);
const SkColor color = SkColorSetARGB(0x30, 0xff, 0, 0);
canvas->DrawRect(outline_rect, color);
}
// Tree operations -------------------------------------------------------------
void View::DoRemoveChildView(View* view,
bool update_focus_cycle,
bool update_tool_tip,
bool delete_removed_view,
View* new_parent) {
DCHECK(view);
const Views::iterator i(std::find(children_.begin(), children_.end(), view));
if (i == children_.end())
return;
std::unique_ptr<View> view_to_be_deleted;
if (update_focus_cycle) {
View* next_focusable = view->next_focusable_view_;
View* prev_focusable = view->previous_focusable_view_;
if (prev_focusable)
prev_focusable->next_focusable_view_ = next_focusable;
if (next_focusable)
next_focusable->previous_focusable_view_ = prev_focusable;
}
Widget* widget = GetWidget();
bool is_removed_from_widget = false;
if (widget) {
UnregisterChildrenForVisibleBoundsNotification(view);
if (view->visible())
view->SchedulePaint();
is_removed_from_widget = !new_parent || new_parent->GetWidget() != widget;
if (is_removed_from_widget)
widget->NotifyWillRemoveView(view);
}
// Make sure the layers belonging to the subtree rooted at |view| get
// removed.
view->OrphanLayers();
if (widget)
widget->LayerTreeChanged();
view->PropagateRemoveNotifications(this, new_parent, is_removed_from_widget);
view->parent_ = nullptr;
if (delete_removed_view && !view->owned_by_client_)
view_to_be_deleted.reset(view);
#if DCHECK_IS_ON()
DCHECK(!iterating_);
#endif
children_.erase(i);
if (update_tool_tip)
UpdateTooltip();
if (layout_manager_)
layout_manager_->ViewRemoved(this, view);
for (ViewObserver& observer : observers_)
observer.OnChildViewRemoved(this, view);
}
void View::PropagateRemoveNotifications(View* old_parent,
View* new_parent,
bool is_removed_from_widget) {
{
internal::ScopedChildrenLock lock(this);
for (auto* child : children_) {
child->PropagateRemoveNotifications(old_parent, new_parent,
is_removed_from_widget);
}
}
ViewHierarchyChangedDetails details(false, old_parent, this, new_parent);
for (View* v = this; v; v = v->parent_)
v->ViewHierarchyChangedImpl(true, details);
if (is_removed_from_widget)
RemovedFromWidget();
}
void View::PropagateAddNotifications(const ViewHierarchyChangedDetails& details,
bool is_added_to_widget) {
{
internal::ScopedChildrenLock lock(this);
for (auto* child : children_)
child->PropagateAddNotifications(details, is_added_to_widget);
}
ViewHierarchyChangedImpl(true, details);
if (is_added_to_widget)
AddedToWidget();
}
void View::PropagateNativeViewHierarchyChanged() {
{
internal::ScopedChildrenLock lock(this);
for (auto* child : children_)
child->PropagateNativeViewHierarchyChanged();
}
NativeViewHierarchyChanged();
}
void View::ViewHierarchyChangedImpl(
bool register_accelerators,
const ViewHierarchyChangedDetails& details) {
if (register_accelerators) {
if (details.is_add) {
// If you get this registration, you are part of a subtree that has been
// added to the view hierarchy.
if (GetFocusManager())
RegisterPendingAccelerators();
} else {
if (details.child == this)
UnregisterAccelerators(true);
}
}
ViewHierarchyChanged(details);
details.parent->needs_layout_ = true;
}
void View::PropagateNativeThemeChanged(const ui::NativeTheme* theme) {
if (native_theme_ && native_theme_ != theme)
return;
{
internal::ScopedChildrenLock lock(this);
for (auto* child : children_)
child->PropagateNativeThemeChanged(theme);
}
OnNativeThemeChanged(theme);
for (ViewObserver& observer : observers_)
observer.OnViewNativeThemeChanged(this);
}
// Size and disposition --------------------------------------------------------
void View::PropagateVisibilityNotifications(View* start, bool is_visible) {
{
internal::ScopedChildrenLock lock(this);
for (auto* child : children_)
child->PropagateVisibilityNotifications(start, is_visible);
}
VisibilityChangedImpl(start, is_visible);
}
void View::VisibilityChangedImpl(View* starting_from, bool is_visible) {
VisibilityChanged(starting_from, is_visible);
}
void View::SnapLayerToPixelBoundary(const LayerOffsetData& offset_data) {
if (!layer())
return;
if (snap_layer_to_pixel_boundary_ && layer()->parent() &&
layer()->GetCompositor()) {
if (layer()->GetCompositor()->is_pixel_canvas()) {
layer()->SetSubpixelPositionOffset(offset_data.GetSubpixelOffset());
} else {
ui::SnapLayerToPhysicalPixelBoundary(layer()->parent(), layer());
}
} else {
// Reset the offset.
layer()->SetSubpixelPositionOffset(gfx::Vector2dF());
}
}
void View::BoundsChanged(const gfx::Rect& previous_bounds) {
if (visible_) {
// Paint the new bounds.
SchedulePaintBoundsChanged(
bounds_.size() == previous_bounds.size() ? SCHEDULE_PAINT_SIZE_SAME :
SCHEDULE_PAINT_SIZE_CHANGED);
}
if (layer()) {
if (parent_) {
LayerOffsetData offset_data(
parent_->CalculateOffsetToAncestorWithLayer(nullptr));
offset_data += GetMirroredPosition().OffsetFromOrigin();
SetLayerBounds(size(), offset_data);
} else {
SetLayerBounds(bounds_.size(),
LayerOffsetData() + bounds_.OffsetFromOrigin());
}
// In RTL mode, if our width has changed, our children's mirrored bounds
// will have changed. Update the child's layer bounds, or if it is not a
// layer, the bounds of any layers inside the child.
if (base::i18n::IsRTL() && bounds_.width() != previous_bounds.width()) {
for (int i = 0; i < child_count(); ++i) {
View* child = child_at(i);
child->UpdateChildLayerBounds(
LayerOffsetData(layer()->device_scale_factor(),
child->GetMirroredPosition().OffsetFromOrigin()));
}
}
} else {
// If our bounds have changed, then any descendant layer bounds may have
// changed. Update them accordingly.
UpdateChildLayerBounds(CalculateOffsetToAncestorWithLayer(NULL));
}
OnBoundsChanged(previous_bounds);
if (bounds_ != previous_bounds)
NotifyAccessibilityEvent(ui::AX_EVENT_LOCATION_CHANGED, false);
if (needs_layout_ || previous_bounds.size() != size()) {
needs_layout_ = false;
Layout();
}
if (GetNeedsNotificationWhenVisibleBoundsChange())
OnVisibleBoundsChanged();
// Notify interested Views that visible bounds within the root view may have
// changed.
if (descendants_to_notify_.get()) {
for (Views::iterator i(descendants_to_notify_->begin());
i != descendants_to_notify_->end(); ++i) {
(*i)->OnVisibleBoundsChanged();
}
}
}
// static
void View::RegisterChildrenForVisibleBoundsNotification(View* view) {
if (view->GetNeedsNotificationWhenVisibleBoundsChange())
view->RegisterForVisibleBoundsNotification();
for (int i = 0; i < view->child_count(); ++i)
RegisterChildrenForVisibleBoundsNotification(view->child_at(i));
}
// static
void View::UnregisterChildrenForVisibleBoundsNotification(View* view) {
if (view->GetNeedsNotificationWhenVisibleBoundsChange())
view->UnregisterForVisibleBoundsNotification();
for (int i = 0; i < view->child_count(); ++i)
UnregisterChildrenForVisibleBoundsNotification(view->child_at(i));
}
void View::RegisterForVisibleBoundsNotification() {
if (registered_for_visible_bounds_notification_)
return;
registered_for_visible_bounds_notification_ = true;
for (View* ancestor = parent_; ancestor; ancestor = ancestor->parent_)
ancestor->AddDescendantToNotify(this);
}
void View::UnregisterForVisibleBoundsNotification() {
if (!registered_for_visible_bounds_notification_)
return;
registered_for_visible_bounds_notification_ = false;
for (View* ancestor = parent_; ancestor; ancestor = ancestor->parent_)
ancestor->RemoveDescendantToNotify(this);
}
void View::AddDescendantToNotify(View* view) {
DCHECK(view);
if (!descendants_to_notify_.get())
descendants_to_notify_.reset(new Views);
descendants_to_notify_->push_back(view);
}
void View::RemoveDescendantToNotify(View* view) {
DCHECK(view && descendants_to_notify_.get());
Views::iterator i(std::find(
descendants_to_notify_->begin(), descendants_to_notify_->end(), view));
DCHECK(i != descendants_to_notify_->end());
descendants_to_notify_->erase(i);
if (descendants_to_notify_->empty())
descendants_to_notify_.reset();
}
void View::SetLayoutManagerImpl(std::unique_ptr<LayoutManager> layout_manager) {
// Some code keeps a bare pointer to the layout manager for calling
// derived-class-specific-functions. It's an easy mistake to create a new
// unique_ptr and re-set the layout manager with a new unique_ptr, which
// will cause a crash. Re-setting to null is OK.
CHECK(!layout_manager.get() || layout_manager_.get() != layout_manager.get());
layout_manager_ = std::move(layout_manager);
if (layout_manager_)
layout_manager_->Installed(this);
}
void View::SetLayerBounds(const gfx::Size& size,
const LayerOffsetData& offset_data) {
layer()->SetBounds(gfx::Rect(size) + offset_data.offset());
SnapLayerToPixelBoundary(offset_data);
}
// Transformations -------------------------------------------------------------
bool View::GetTransformRelativeTo(const View* ancestor,
gfx::Transform* transform) const {
const View* p = this;
while (p && p != ancestor) {
transform->ConcatTransform(p->GetTransform());
gfx::Transform translation;
translation.Translate(static_cast<float>(p->GetMirroredX()),
static_cast<float>(p->y()));
transform->ConcatTransform(translation);
p = p->parent_;
}
return p == ancestor;
}
// Coordinate conversion -------------------------------------------------------
bool View::ConvertPointForAncestor(const View* ancestor,
gfx::Point* point) const {
gfx::Transform trans;
// TODO(sad): Have some way of caching the transformation results.
bool result = GetTransformRelativeTo(ancestor, &trans);
auto p = gfx::Point3F(gfx::PointF(*point));
trans.TransformPoint(&p);
*point = gfx::ToFlooredPoint(p.AsPointF());
return result;
}
bool View::ConvertPointFromAncestor(const View* ancestor,
gfx::Point* point) const {
gfx::Transform trans;
bool result = GetTransformRelativeTo(ancestor, &trans);
auto p = gfx::Point3F(gfx::PointF(*point));
trans.TransformPointReverse(&p);
*point = gfx::ToFlooredPoint(p.AsPointF());
return result;
}
bool View::ConvertRectForAncestor(const View* ancestor,
gfx::RectF* rect) const {
gfx::Transform trans;
// TODO(sad): Have some way of caching the transformation results.
bool result = GetTransformRelativeTo(ancestor, &trans);
trans.TransformRect(rect);
return result;
}
bool View::ConvertRectFromAncestor(const View* ancestor,
gfx::RectF* rect) const {
gfx::Transform trans;
bool result = GetTransformRelativeTo(ancestor, &trans);
trans.TransformRectReverse(rect);
return result;
}
// Accelerated painting --------------------------------------------------------
void View::CreateLayer(ui::LayerType layer_type) {
// A new layer is being created for the view. So all the layers of the
// sub-tree can inherit the visibility of the corresponding view.
{
internal::ScopedChildrenLock lock(this);
for (auto* child : children_)
child->UpdateChildLayerVisibility(true);
}
SetLayer(std::make_unique<ui::Layer>(layer_type));
layer()->set_delegate(this);
layer()->set_name(GetClassName());
UpdateParentLayers();
UpdateLayerVisibility();
// The new layer needs to be ordered in the layer tree according
// to the view tree. Children of this layer were added in order
// in UpdateParentLayers().
if (parent())
parent()->ReorderLayers();
Widget* widget = GetWidget();
if (widget)
widget->LayerTreeChanged();
// Before having its own Layer, this View may have painted in to a Layer owned
// by an ancestor View. Scheduling a paint on the parent View will erase this
// View's painting effects on the ancestor View's Layer.
// (See crbug.com/551492)
SchedulePaintOnParent();
}
bool View::UpdateParentLayers() {
// Attach all top-level un-parented layers.
if (layer()) {
if (!layer()->parent()) {
UpdateParentLayer();
return true;
}
// The layers of any child views are already in place, so we can stop
// iterating here.
return false;
}
bool result = false;
internal::ScopedChildrenLock lock(this);
for (auto* child : children_) {
if (child->UpdateParentLayers())
result = true;
}
return result;
}
void View::OrphanLayers() {
if (layer()) {
if (layer()->parent())
layer()->parent()->Remove(layer());
// The layer belonging to this View has already been orphaned. It is not
// necessary to orphan the child layers.
return;
}
internal::ScopedChildrenLock lock(this);
for (auto* child : children_)
child->OrphanLayers();
}
void View::ReparentLayer(const gfx::Vector2d& offset, ui::Layer* parent_layer) {
layer()->SetBounds(GetLocalBounds() + offset);
DCHECK_NE(layer(), parent_layer);
if (parent_layer)
parent_layer->Add(layer());
layer()->SchedulePaint(GetLocalBounds());
MoveLayerToParent(layer(), LayerOffsetData(layer()->device_scale_factor()));
}
// Input -----------------------------------------------------------------------
bool View::ProcessMousePressed(const ui::MouseEvent& event) {
int drag_operations =
(enabled_ && event.IsOnlyLeftMouseButton() &&
HitTestPoint(event.location())) ?
GetDragOperations(event.location()) : 0;
ContextMenuController* context_menu_controller = event.IsRightMouseButton() ?
context_menu_controller_ : 0;
View::DragInfo* drag_info = GetDragInfo();
const bool enabled = enabled_;
const bool result = OnMousePressed(event);
if (!enabled)
return result;
if (event.IsOnlyRightMouseButton() && context_menu_controller &&
kContextMenuOnMousePress) {
// Assume that if there is a context menu controller we won't be deleted
// from mouse pressed.
if (HitTestPoint(event.location())) {
gfx::Point location(event.location());
ConvertPointToScreen(this, &location);
ShowContextMenu(location, ui::MENU_SOURCE_MOUSE);
return true;
}
}
// WARNING: we may have been deleted, don't use any View variables.
if (drag_operations != ui::DragDropTypes::DRAG_NONE) {
drag_info->PossibleDrag(event.location());
return true;
}
return !!context_menu_controller || result;
}
bool View::ProcessMouseDragged(const ui::MouseEvent& event) {
// Copy the field, that way if we're deleted after drag and drop no harm is
// done.
ContextMenuController* context_menu_controller = context_menu_controller_;
const bool possible_drag = GetDragInfo()->possible_drag;
if (possible_drag &&
ExceededDragThreshold(GetDragInfo()->start_pt - event.location()) &&
(!drag_controller_ ||
drag_controller_->CanStartDragForView(
this, GetDragInfo()->start_pt, event.location()))) {
DoDrag(event, GetDragInfo()->start_pt,
ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE);
} else {
if (OnMouseDragged(event))
return true;
// Fall through to return value based on context menu controller.
}
// WARNING: we may have been deleted.
return (context_menu_controller != NULL) || possible_drag;
}
void View::ProcessMouseReleased(const ui::MouseEvent& event) {
if (!kContextMenuOnMousePress && context_menu_controller_ &&
event.IsOnlyRightMouseButton()) {
// Assume that if there is a context menu controller we won't be deleted
// from mouse released.
gfx::Point location(event.location());
OnMouseReleased(event);
if (HitTestPoint(location)) {
ConvertPointToScreen(this, &location);
ShowContextMenu(location, ui::MENU_SOURCE_MOUSE);
}
} else {
OnMouseReleased(event);
}
// WARNING: we may have been deleted.
}
// Accelerators ----------------------------------------------------------------
void View::RegisterPendingAccelerators() {
if (!accelerators_.get() ||
registered_accelerator_count_ == accelerators_->size()) {
// No accelerators are waiting for registration.
return;
}
if (!GetWidget()) {
// The view is not yet attached to a widget, defer registration until then.
return;
}
accelerator_focus_manager_ = GetFocusManager();
if (!accelerator_focus_manager_) {
// Some crash reports seem to show that we may get cases where we have no
// focus manager (see bug #1291225). This should never be the case, just
// making sure we don't crash.
NOTREACHED();
return;
}
for (std::vector<ui::Accelerator>::const_iterator i(
accelerators_->begin() + registered_accelerator_count_);
i != accelerators_->end(); ++i) {
accelerator_focus_manager_->RegisterAccelerator(
*i, ui::AcceleratorManager::kNormalPriority, this);
}
registered_accelerator_count_ = accelerators_->size();
}
void View::UnregisterAccelerators(bool leave_data_intact) {
if (!accelerators_.get())
return;
if (GetWidget()) {
if (accelerator_focus_manager_) {
accelerator_focus_manager_->UnregisterAccelerators(this);
accelerator_focus_manager_ = NULL;
}
if (!leave_data_intact) {
accelerators_->clear();
accelerators_.reset();
}
registered_accelerator_count_ = 0;
}
}
// Focus -----------------------------------------------------------------------
void View::InitFocusSiblings(View* v, int index) {
int count = child_count();
if (count == 0) {
v->next_focusable_view_ = NULL;
v->previous_focusable_view_ = NULL;
} else {
if (index == count) {
// We are inserting at the end, but the end of the child list may not be
// the last focusable element. Let's try to find an element with no next
// focusable element to link to.
View* last_focusable_view = NULL;
{
internal::ScopedChildrenLock lock(this);
for (auto* child : children_) {
if (!child->next_focusable_view_) {
last_focusable_view = child;
break;
}
}
}
if (last_focusable_view == NULL) {
// Hum... there is a cycle in the focus list. Let's just insert ourself
// after the last child.
View* prev = children_[index - 1];
v->previous_focusable_view_ = prev;
v->next_focusable_view_ = prev->next_focusable_view_;
prev->next_focusable_view_->previous_focusable_view_ = v;
prev->next_focusable_view_ = v;
} else {
last_focusable_view->next_focusable_view_ = v;
v->next_focusable_view_ = NULL;
v->previous_focusable_view_ = last_focusable_view;
}
} else {
View* prev = children_[index]->GetPreviousFocusableView();
v->previous_focusable_view_ = prev;
v->next_focusable_view_ = children_[index];
if (prev)
prev->next_focusable_view_ = v;
children_[index]->previous_focusable_view_ = v;
}
}
}
void View::AdvanceFocusIfNecessary() {
// Focus should only be advanced if this is the focused view and has become
// unfocusable. If the view is still focusable or is not focused, we can
// return early avoiding furthur unnecessary checks. Focusability check is
// performed first as it tends to be faster.
if (IsAccessibilityFocusable() || !HasFocus())
return;
FocusManager* focus_manager = GetFocusManager();
if (focus_manager)
focus_manager->AdvanceFocusIfNecessary();
}
// System events ---------------------------------------------------------------
void View::PropagateThemeChanged() {
{
internal::ScopedChildrenLock lock(this);
for (auto* child : base::Reversed(children_))
child->PropagateThemeChanged();
}
OnThemeChanged();
}
void View::PropagateDeviceScaleFactorChanged(float old_device_scale_factor,
float new_device_scale_factor) {
{
internal::ScopedChildrenLock lock(this);
for (auto* child : base::Reversed(children_)) {
child->PropagateDeviceScaleFactorChanged(old_device_scale_factor,
new_device_scale_factor);
}
}