blob: 7498131a6c01025ab902558dc4828579c0af106f [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 "ash/wm/wm_toplevel_window_event_handler.h"
#include "ash/shell.h"
#include "ash/wm/resize_shadow_controller.h"
#include "ash/wm/tablet_mode/tablet_mode_controller.h"
#include "ash/wm/window_resizer.h"
#include "ash/wm/window_state.h"
#include "ash/wm/window_state_observer.h"
#include "ash/wm/window_util.h"
#include "ash/wm/wm_event.h"
#include "ui/aura/client/window_types.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/aura/window_observer.h"
#include "ui/base/hit_test.h"
#include "ui/events/event.h"
namespace ash {
namespace wm {
namespace {
// Returns whether |window| can be moved via a two finger drag given
// the hittest results of the two fingers.
bool CanStartTwoFingerMove(aura::Window* window,
int window_component1,
int window_component2) {
// We allow moving a window via two fingers when the hittest components are
// HTCLIENT. This is done so that a window can be dragged via two fingers when
// the tab strip is full and hitting the caption area is difficult. We check
// the window type and the state type so that we do not steal touches from the
// web contents.
if (window->type() != aura::client::WINDOW_TYPE_NORMAL ||
!GetWindowState(window)->IsNormalOrSnapped()) {
return false;
}
int component1_behavior =
WindowResizer::GetBoundsChangeForWindowComponent(window_component1);
int component2_behavior =
WindowResizer::GetBoundsChangeForWindowComponent(window_component2);
return (component1_behavior & WindowResizer::kBoundsChange_Resizes) == 0 &&
(component2_behavior & WindowResizer::kBoundsChange_Resizes) == 0;
}
// Returns whether |window| can be moved or resized via one finger given
// |window_component|.
bool CanStartOneFingerDrag(int window_component) {
return WindowResizer::GetBoundsChangeForWindowComponent(window_component) !=
0;
}
void ShowResizeShadow(aura::Window* window, int component) {
// Window resize in tablet mode is disabled (except in splitscreen).
if (Shell::Get()
->tablet_mode_controller()
->IsTabletModeWindowManagerEnabled()) {
return;
}
ResizeShadowController* resize_shadow_controller =
Shell::Get()->resize_shadow_controller();
if (resize_shadow_controller)
resize_shadow_controller->ShowShadow(window, component);
}
void HideResizeShadow(aura::Window* window) {
ResizeShadowController* resize_shadow_controller =
Shell::Get()->resize_shadow_controller();
if (resize_shadow_controller)
resize_shadow_controller->HideShadow(window);
}
} // namespace
// ScopedWindowResizer ---------------------------------------------------------
// Wraps a WindowResizer and installs an observer on its target window. When
// the window is destroyed ResizerWindowDestroyed() is invoked back on the
// WmToplevelWindowEventHandler to clean up.
class WmToplevelWindowEventHandler::ScopedWindowResizer
: public aura::WindowObserver,
public wm::WindowStateObserver {
public:
ScopedWindowResizer(WmToplevelWindowEventHandler* handler,
std::unique_ptr<WindowResizer> resizer);
~ScopedWindowResizer() override;
// Returns true if the drag moves the window and does not resize.
bool IsMove() const;
WindowResizer* resizer() { return resizer_.get(); }
// WindowObserver overrides:
void OnWindowDestroying(aura::Window* window) override;
// WindowStateObserver overrides:
void OnPreWindowStateTypeChange(wm::WindowState* window_state,
mojom::WindowStateType type) override;
private:
WmToplevelWindowEventHandler* handler_;
std::unique_ptr<WindowResizer> resizer_;
// Whether ScopedWindowResizer grabbed capture.
bool grabbed_capture_;
DISALLOW_COPY_AND_ASSIGN(ScopedWindowResizer);
};
WmToplevelWindowEventHandler::ScopedWindowResizer::ScopedWindowResizer(
WmToplevelWindowEventHandler* handler,
std::unique_ptr<WindowResizer> resizer)
: handler_(handler), resizer_(std::move(resizer)), grabbed_capture_(false) {
aura::Window* target = resizer_->GetTarget();
target->AddObserver(this);
GetWindowState(target)->AddObserver(this);
if (!target->HasCapture()) {
grabbed_capture_ = true;
target->SetCapture();
}
}
WmToplevelWindowEventHandler::ScopedWindowResizer::~ScopedWindowResizer() {
aura::Window* target = resizer_->GetTarget();
target->RemoveObserver(this);
GetWindowState(target)->RemoveObserver(this);
if (grabbed_capture_)
target->ReleaseCapture();
}
bool WmToplevelWindowEventHandler::ScopedWindowResizer::IsMove() const {
return resizer_->details().bounds_change ==
WindowResizer::kBoundsChange_Repositions;
}
void WmToplevelWindowEventHandler::ScopedWindowResizer::
OnPreWindowStateTypeChange(wm::WindowState* window_state,
mojom::WindowStateType old) {
handler_->CompleteDrag(DragResult::SUCCESS);
}
void WmToplevelWindowEventHandler::ScopedWindowResizer::OnWindowDestroying(
aura::Window* window) {
DCHECK_EQ(resizer_->GetTarget(), window);
handler_->ResizerWindowDestroyed();
}
// WmToplevelWindowEventHandler
// --------------------------------------------------
WmToplevelWindowEventHandler::WmToplevelWindowEventHandler()
: first_finger_hittest_(HTNOWHERE) {
Shell::Get()->window_tree_host_manager()->AddObserver(this);
}
WmToplevelWindowEventHandler::~WmToplevelWindowEventHandler() {
Shell::Get()->window_tree_host_manager()->RemoveObserver(this);
}
void WmToplevelWindowEventHandler::OnKeyEvent(ui::KeyEvent* event) {
if (window_resizer_.get() && event->type() == ui::ET_KEY_PRESSED &&
event->key_code() == ui::VKEY_ESCAPE) {
CompleteDrag(DragResult::REVERT);
}
}
void WmToplevelWindowEventHandler::OnMouseEvent(ui::MouseEvent* event,
aura::Window* target) {
UpdateGestureTarget(nullptr);
if (event->handled())
return;
if ((event->flags() &
(ui::EF_MIDDLE_MOUSE_BUTTON | ui::EF_RIGHT_MOUSE_BUTTON)) != 0)
return;
if (event->type() == ui::ET_MOUSE_CAPTURE_CHANGED) {
// Capture is grabbed when both gesture and mouse drags start. Handle
// capture loss regardless of which type of drag is in progress.
HandleCaptureLost(event);
return;
}
if (in_gesture_drag_)
return;
switch (event->type()) {
case ui::ET_MOUSE_PRESSED:
HandleMousePressed(target, event);
break;
case ui::ET_MOUSE_DRAGGED:
HandleDrag(target, event);
break;
case ui::ET_MOUSE_RELEASED:
HandleMouseReleased(target, event);
break;
case ui::ET_MOUSE_MOVED:
HandleMouseMoved(target, event);
break;
case ui::ET_MOUSE_EXITED:
HandleMouseExited(target, event);
break;
default:
break;
}
}
void WmToplevelWindowEventHandler::OnGestureEvent(ui::GestureEvent* event,
aura::Window* target) {
if (event->type() == ui::ET_GESTURE_END)
UpdateGestureTarget(nullptr);
else if (event->type() == ui::ET_GESTURE_BEGIN)
UpdateGestureTarget(target, event->location());
if (event->handled())
return;
if (!target->delegate())
return;
if (window_resizer_.get() && !in_gesture_drag_)
return;
if (window_resizer_.get() &&
window_resizer_->resizer()->GetTarget() != target) {
return;
}
if (event->details().touch_points() > 2) {
if (CompleteDrag(DragResult::SUCCESS))
event->StopPropagation();
return;
}
switch (event->type()) {
case ui::ET_GESTURE_TAP_DOWN: {
int component = GetNonClientComponent(target, event->location());
if (!(WindowResizer::GetBoundsChangeForWindowComponent(component) &
WindowResizer::kBoundsChange_Resizes))
return;
ShowResizeShadow(target, component);
return;
}
case ui::ET_GESTURE_END: {
HideResizeShadow(target);
if (window_resizer_.get() &&
(event->details().touch_points() == 1 ||
!CanStartOneFingerDrag(first_finger_hittest_))) {
CompleteDrag(DragResult::SUCCESS);
event->StopPropagation();
}
return;
}
case ui::ET_GESTURE_BEGIN: {
if (event->details().touch_points() == 1) {
first_finger_touch_point_ = event->location();
aura::Window::ConvertPointToTarget(target, target->parent(),
&first_finger_touch_point_);
first_finger_hittest_ =
GetNonClientComponent(target, event->location());
} else if (window_resizer_.get()) {
if (!window_resizer_->IsMove()) {
// The transition from resizing with one finger to resizing with two
// fingers causes unintended resizing because the location of
// ET_GESTURE_SCROLL_UPDATE jumps from the position of the first
// finger to the position in the middle of the two fingers. For this
// reason two finger resizing is not supported.
CompleteDrag(DragResult::SUCCESS);
event->StopPropagation();
}
} else {
int second_finger_hittest =
GetNonClientComponent(target, event->location());
if (CanStartTwoFingerMove(target, first_finger_hittest_,
second_finger_hittest)) {
AttemptToStartDrag(target, first_finger_touch_point_, HTCAPTION,
::wm::WINDOW_MOVE_SOURCE_TOUCH, EndClosure());
event->StopPropagation();
}
}
return;
}
case ui::ET_GESTURE_SCROLL_BEGIN: {
// The one finger drag is not started in ET_GESTURE_BEGIN to avoid the
// window jumping upon initiating a two finger drag. When a one finger
// drag is converted to a two finger drag, a jump occurs because the
// location of the ET_GESTURE_SCROLL_UPDATE event switches from the single
// finger's position to the position in the middle of the two fingers.
if (window_resizer_.get())
return;
int component = GetNonClientComponent(target, event->location());
if (!CanStartOneFingerDrag(component))
return;
gfx::Point location_in_parent = event->location();
aura::Window::ConvertPointToTarget(target, target->parent(),
&location_in_parent);
AttemptToStartDrag(target, location_in_parent, component,
::wm::WINDOW_MOVE_SOURCE_TOUCH, EndClosure());
event->StopPropagation();
return;
}
default:
break;
}
if (!window_resizer_.get())
return;
switch (event->type()) {
case ui::ET_GESTURE_SCROLL_UPDATE:
HandleDrag(target, event);
event->StopPropagation();
return;
case ui::ET_GESTURE_SCROLL_END:
// We must complete the drag here instead of as a result of ET_GESTURE_END
// because otherwise the drag will be reverted when EndMoveLoop() is
// called.
// TODO(pkotwicz): Pass drag completion status to
// WindowMoveClient::EndMoveLoop().
CompleteDrag(DragResult::SUCCESS);
event->StopPropagation();
return;
case ui::ET_SCROLL_FLING_START:
FALLTHROUGH;
case ui::ET_GESTURE_SWIPE:
HandleFlingOrSwipe(event);
return;
default:
return;
}
}
bool WmToplevelWindowEventHandler::AttemptToStartDrag(
aura::Window* window,
const gfx::Point& point_in_parent,
int window_component,
::wm::WindowMoveSource source,
EndClosure end_closure) {
if (!PrepareForDrag(window, point_in_parent, window_component, source)) {
// Treat failure to start as a revert.
if (end_closure)
std::move(end_closure).Run(DragResult::REVERT);
return false;
}
end_closure_ = std::move(end_closure);
in_gesture_drag_ = (source == ::wm::WINDOW_MOVE_SOURCE_TOUCH);
return true;
}
void WmToplevelWindowEventHandler::RevertDrag() {
CompleteDrag(DragResult::REVERT);
}
bool WmToplevelWindowEventHandler::PrepareForDrag(
aura::Window* window,
const gfx::Point& point_in_parent,
int window_component,
::wm::WindowMoveSource source) {
if (window_resizer_)
return false;
std::unique_ptr<WindowResizer> resizer(
CreateWindowResizer(window, point_in_parent, window_component, source));
if (!resizer)
return false;
window_resizer_ =
std::make_unique<ScopedWindowResizer>(this, std::move(resizer));
return true;
}
bool WmToplevelWindowEventHandler::CompleteDrag(DragResult result) {
UpdateGestureTarget(nullptr);
if (!window_resizer_)
return false;
std::unique_ptr<ScopedWindowResizer> resizer(std::move(window_resizer_));
switch (result) {
case DragResult::SUCCESS:
resizer->resizer()->CompleteDrag();
break;
case DragResult::REVERT:
resizer->resizer()->RevertDrag();
break;
case DragResult::WINDOW_DESTROYED:
// We explicitly do not invoke RevertDrag() since that may do things to
// the window that was destroyed.
break;
}
first_finger_hittest_ = HTNOWHERE;
in_gesture_drag_ = false;
if (end_closure_)
std::move(end_closure_).Run(result);
return true;
}
void WmToplevelWindowEventHandler::HandleMousePressed(aura::Window* target,
ui::MouseEvent* event) {
if (event->phase() != ui::EP_PRETARGET || !target->delegate())
return;
// We also update the current window component here because for the
// mouse-drag-release-press case, where the mouse is released and
// pressed without mouse move event.
int component = GetNonClientComponent(target, event->location());
if ((event->flags() & (ui::EF_IS_DOUBLE_CLICK | ui::EF_IS_TRIPLE_CLICK)) ==
0 &&
WindowResizer::GetBoundsChangeForWindowComponent(component)) {
gfx::Point location_in_parent = event->location();
aura::Window::ConvertPointToTarget(target, target->parent(),
&location_in_parent);
AttemptToStartDrag(target, location_in_parent, component,
::wm::WINDOW_MOVE_SOURCE_MOUSE, EndClosure());
// Set as handled so that other event handlers do no act upon the event
// but still receive it so that they receive both parts of each pressed/
// released pair.
event->SetHandled();
} else {
CompleteDrag(DragResult::SUCCESS);
}
}
void WmToplevelWindowEventHandler::HandleMouseReleased(aura::Window* target,
ui::MouseEvent* event) {
if (event->phase() == ui::EP_PRETARGET)
CompleteDrag(DragResult::SUCCESS);
}
void WmToplevelWindowEventHandler::HandleDrag(aura::Window* target,
ui::LocatedEvent* event) {
// This function only be triggered to move window
// by mouse drag or touch move event.
DCHECK(event->type() == ui::ET_MOUSE_DRAGGED ||
event->type() == ui::ET_TOUCH_MOVED ||
event->type() == ui::ET_GESTURE_SCROLL_UPDATE);
// Drag actions are performed pre-target handling to prevent spurious mouse
// moves from the move/size operation from being sent to the target.
if (event->phase() != ui::EP_PRETARGET)
return;
if (!window_resizer_)
return;
gfx::Point location_in_parent = event->location();
aura::Window::ConvertPointToTarget(target, target->parent(),
&location_in_parent);
window_resizer_->resizer()->Drag(location_in_parent, event->flags());
event->StopPropagation();
}
void WmToplevelWindowEventHandler::HandleMouseMoved(aura::Window* target,
ui::LocatedEvent* event) {
// Shadow effects are applied after target handling. Note that we don't
// respect ER_HANDLED here right now since we have not had a reason to allow
// the target to cancel shadow rendering.
if (event->phase() != ui::EP_POSTTARGET || !target->delegate())
return;
// TODO(jamescook): Move the resize cursor update code into here from
// CompoundEventFilter?
if (event->flags() & ui::EF_IS_NON_CLIENT) {
int component = GetNonClientComponent(target, event->location());
ShowResizeShadow(target, component);
} else {
HideResizeShadow(target);
}
}
void WmToplevelWindowEventHandler::HandleMouseExited(aura::Window* target,
ui::LocatedEvent* event) {
// Shadow effects are applied after target handling. Note that we don't
// respect ER_HANDLED here right now since we have not had a reason to allow
// the target to cancel shadow rendering.
if (event->phase() != ui::EP_POSTTARGET)
return;
HideResizeShadow(target);
}
void WmToplevelWindowEventHandler::HandleCaptureLost(ui::LocatedEvent* event) {
if (event->phase() == ui::EP_PRETARGET) {
// We complete the drag instead of reverting it, as reverting it will result
// in a weird behavior when a dragged tab produces a modal dialog while the
// drag is in progress. crbug.com/558201.
CompleteDrag(DragResult::SUCCESS);
}
}
void WmToplevelWindowEventHandler::HandleFlingOrSwipe(ui::GestureEvent* event) {
UpdateGestureTarget(nullptr);
if (!window_resizer_)
return;
std::unique_ptr<ScopedWindowResizer> resizer(std::move(window_resizer_));
resizer->resizer()->FlingOrSwipe(event);
first_finger_hittest_ = HTNOWHERE;
in_gesture_drag_ = false;
if (end_closure_)
std::move(end_closure_).Run(DragResult::SUCCESS);
}
void WmToplevelWindowEventHandler::ResizerWindowDestroyed() {
CompleteDrag(DragResult::WINDOW_DESTROYED);
}
void WmToplevelWindowEventHandler::OnDisplayConfigurationChanging() {
CompleteDrag(DragResult::REVERT);
}
void WmToplevelWindowEventHandler::OnWindowDestroying(aura::Window* window) {
DCHECK_EQ(gesture_target_, window);
if (gesture_target_ == window)
UpdateGestureTarget(nullptr);
}
void WmToplevelWindowEventHandler::UpdateGestureTarget(
aura::Window* target,
const gfx::Point& location) {
event_location_in_gesture_target_ = location;
if (gesture_target_ == target)
return;
if (gesture_target_)
gesture_target_->RemoveObserver(this);
gesture_target_ = target;
if (gesture_target_)
gesture_target_->AddObserver(this);
}
} // namespace wm
} // namespace ash