| // 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/controls/label.h" |
| |
| #include <stddef.h> |
| |
| #include <algorithm> |
| #include <cmath> |
| #include <limits> |
| #include <utility> |
| #include <vector> |
| |
| #include "base/i18n/rtl.h" |
| #include "base/logging.h" |
| #include "base/memory/ptr_util.h" |
| #include "base/profiler/scoped_tracker.h" |
| #include "base/strings/string_split.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "ui/accessibility/ax_node_data.h" |
| #include "ui/base/clipboard/scoped_clipboard_writer.h" |
| #include "ui/base/cursor/cursor.h" |
| #include "ui/base/default_style.h" |
| #include "ui/base/material_design/material_design_controller.h" |
| #include "ui/gfx/canvas.h" |
| #include "ui/gfx/color_utils.h" |
| #include "ui/gfx/geometry/insets.h" |
| #include "ui/gfx/text_elider.h" |
| #include "ui/native_theme/native_theme.h" |
| #include "ui/strings/grit/ui_strings.h" |
| #include "ui/views/background.h" |
| #include "ui/views/controls/menu/menu_runner.h" |
| #include "ui/views/focus/focus_manager.h" |
| #include "ui/views/native_cursor.h" |
| #include "ui/views/selection_controller.h" |
| |
| namespace views { |
| // static |
| const char Label::kViewClassName[] = "Label"; |
| const int Label::kFocusBorderPadding = 1; |
| |
| Label::Label() : Label(base::string16()) { |
| } |
| |
| Label::Label(const base::string16& text) |
| : Label(text, style::CONTEXT_LABEL, style::STYLE_PRIMARY) {} |
| |
| Label::Label(const base::string16& text, int text_context, int text_style) |
| : context_menu_contents_(this) { |
| Init(text, style::GetFont(text_context, text_style)); |
| } |
| |
| Label::Label(const base::string16& text, const CustomFont& font) |
| : context_menu_contents_(this) { |
| Init(text, font.font_list); |
| } |
| |
| Label::~Label() { |
| } |
| |
| // static |
| const gfx::FontList& Label::GetDefaultFontList() { |
| return style::GetFont(style::CONTEXT_LABEL, style::STYLE_PRIMARY); |
| } |
| |
| void Label::SetFontList(const gfx::FontList& font_list) { |
| is_first_paint_text_ = true; |
| render_text_->SetFontList(font_list); |
| ResetLayout(); |
| } |
| |
| void Label::SetText(const base::string16& new_text) { |
| if (new_text == text()) |
| return; |
| is_first_paint_text_ = true; |
| render_text_->SetText(new_text); |
| ResetLayout(); |
| stored_selection_range_ = gfx::Range::InvalidRange(); |
| } |
| |
| void Label::SetAutoColorReadabilityEnabled(bool enabled) { |
| if (auto_color_readability_ == enabled) |
| return; |
| is_first_paint_text_ = true; |
| auto_color_readability_ = enabled; |
| RecalculateColors(); |
| } |
| |
| void Label::SetEnabledColor(SkColor color) { |
| if (enabled_color_set_ && requested_enabled_color_ == color) |
| return; |
| is_first_paint_text_ = true; |
| requested_enabled_color_ = color; |
| enabled_color_set_ = true; |
| RecalculateColors(); |
| } |
| |
| void Label::SetDisabledColor(SkColor color) { |
| if (disabled_color_set_ && requested_disabled_color_ == color) |
| return; |
| is_first_paint_text_ = true; |
| requested_disabled_color_ = color; |
| disabled_color_set_ = true; |
| RecalculateColors(); |
| } |
| |
| void Label::SetBackgroundColor(SkColor color) { |
| if (background_color_set_ && background_color_ == color) |
| return; |
| is_first_paint_text_ = true; |
| background_color_ = color; |
| background_color_set_ = true; |
| RecalculateColors(); |
| } |
| |
| void Label::SetSelectionTextColor(SkColor color) { |
| if (selection_text_color_set_ && requested_selection_text_color_ == color) |
| return; |
| is_first_paint_text_ = true; |
| requested_selection_text_color_ = color; |
| selection_text_color_set_ = true; |
| RecalculateColors(); |
| } |
| |
| void Label::SetSelectionBackgroundColor(SkColor color) { |
| if (selection_background_color_set_ && selection_background_color_ == color) |
| return; |
| is_first_paint_text_ = true; |
| selection_background_color_ = color; |
| selection_background_color_set_ = true; |
| RecalculateColors(); |
| } |
| |
| void Label::SetShadows(const gfx::ShadowValues& shadows) { |
| // TODO(mukai): early exit if the specified shadows are same. |
| is_first_paint_text_ = true; |
| render_text_->set_shadows(shadows); |
| ResetLayout(); |
| } |
| |
| void Label::SetSubpixelRenderingEnabled(bool subpixel_rendering_enabled) { |
| if (subpixel_rendering_enabled_ == subpixel_rendering_enabled) |
| return; |
| is_first_paint_text_ = true; |
| subpixel_rendering_enabled_ = subpixel_rendering_enabled; |
| RecalculateColors(); |
| } |
| |
| void Label::SetHorizontalAlignment(gfx::HorizontalAlignment alignment) { |
| // If the UI layout is right-to-left, flip the alignment direction. |
| if (base::i18n::IsRTL() && |
| (alignment == gfx::ALIGN_LEFT || alignment == gfx::ALIGN_RIGHT)) { |
| alignment = (alignment == gfx::ALIGN_LEFT) ? |
| gfx::ALIGN_RIGHT : gfx::ALIGN_LEFT; |
| } |
| if (horizontal_alignment() == alignment) |
| return; |
| is_first_paint_text_ = true; |
| render_text_->SetHorizontalAlignment(alignment); |
| ResetLayout(); |
| } |
| |
| void Label::SetLineHeight(int height) { |
| if (line_height() == height) |
| return; |
| is_first_paint_text_ = true; |
| render_text_->SetMinLineHeight(height); |
| ResetLayout(); |
| } |
| |
| void Label::SetMultiLine(bool multi_line) { |
| DCHECK(!multi_line || (elide_behavior_ == gfx::ELIDE_TAIL || |
| elide_behavior_ == gfx::NO_ELIDE)); |
| if (this->multi_line() == multi_line) |
| return; |
| is_first_paint_text_ = true; |
| multi_line_ = multi_line; |
| if (render_text_->MultilineSupported()) |
| render_text_->SetMultiline(multi_line); |
| render_text_->SetReplaceNewlineCharsWithSymbols(!multi_line); |
| ResetLayout(); |
| } |
| |
| void Label::SetObscured(bool obscured) { |
| if (this->obscured() == obscured) |
| return; |
| is_first_paint_text_ = true; |
| render_text_->SetObscured(obscured); |
| if (obscured) |
| SetSelectable(false); |
| ResetLayout(); |
| } |
| |
| void Label::SetAllowCharacterBreak(bool allow_character_break) { |
| const gfx::WordWrapBehavior behavior = |
| allow_character_break ? gfx::WRAP_LONG_WORDS : gfx::TRUNCATE_LONG_WORDS; |
| if (render_text_->word_wrap_behavior() == behavior) |
| return; |
| render_text_->SetWordWrapBehavior(behavior); |
| if (multi_line()) { |
| is_first_paint_text_ = true; |
| ResetLayout(); |
| } |
| } |
| |
| void Label::SetElideBehavior(gfx::ElideBehavior elide_behavior) { |
| DCHECK(!multi_line() || (elide_behavior_ == gfx::ELIDE_TAIL || |
| elide_behavior_ == gfx::NO_ELIDE)); |
| if (elide_behavior_ == elide_behavior) |
| return; |
| is_first_paint_text_ = true; |
| elide_behavior_ = elide_behavior; |
| ResetLayout(); |
| } |
| |
| void Label::SetTooltipText(const base::string16& tooltip_text) { |
| DCHECK(handles_tooltips_); |
| tooltip_text_ = tooltip_text; |
| } |
| |
| void Label::SetHandlesTooltips(bool enabled) { |
| handles_tooltips_ = enabled; |
| } |
| |
| void Label::SizeToFit(int fixed_width) { |
| DCHECK(multi_line()); |
| DCHECK_EQ(0, max_width_); |
| fixed_width_ = fixed_width; |
| SizeToPreferredSize(); |
| } |
| |
| void Label::SetMaximumWidth(int max_width) { |
| DCHECK(multi_line()); |
| DCHECK_EQ(0, fixed_width_); |
| max_width_ = max_width; |
| SizeToPreferredSize(); |
| } |
| |
| base::string16 Label::GetDisplayTextForTesting() { |
| ClearRenderTextLines(); |
| MaybeBuildRenderTextLines(); |
| base::string16 result; |
| if (lines_.empty()) |
| return result; |
| result.append(lines_[0]->GetDisplayText()); |
| for (size_t i = 1; i < lines_.size(); ++i) { |
| result.append(1, '\n'); |
| result.append(lines_[i]->GetDisplayText()); |
| } |
| return result; |
| } |
| |
| bool Label::IsSelectionSupported() const { |
| return !obscured() && render_text_->IsSelectionSupported(); |
| } |
| |
| bool Label::SetSelectable(bool value) { |
| if (value == selectable()) |
| return true; |
| |
| if (!value) { |
| ClearSelection(); |
| stored_selection_range_ = gfx::Range::InvalidRange(); |
| selection_controller_.reset(); |
| return true; |
| } |
| |
| DCHECK(!stored_selection_range_.IsValid()); |
| if (!IsSelectionSupported()) |
| return false; |
| |
| selection_controller_ = base::MakeUnique<SelectionController>(this); |
| return true; |
| } |
| |
| bool Label::HasSelection() const { |
| const gfx::RenderText* render_text = GetRenderTextForSelectionController(); |
| return render_text ? !render_text->selection().is_empty() : false; |
| } |
| |
| void Label::SelectAll() { |
| gfx::RenderText* render_text = GetRenderTextForSelectionController(); |
| if (!render_text) |
| return; |
| render_text->SelectAll(false); |
| SchedulePaint(); |
| } |
| |
| void Label::ClearSelection() { |
| gfx::RenderText* render_text = GetRenderTextForSelectionController(); |
| if (!render_text) |
| return; |
| render_text->ClearSelection(); |
| SchedulePaint(); |
| } |
| |
| void Label::SelectRange(const gfx::Range& range) { |
| gfx::RenderText* render_text = GetRenderTextForSelectionController(); |
| if (render_text && render_text->SelectRange(range)) |
| SchedulePaint(); |
| } |
| |
| gfx::Insets Label::GetInsets() const { |
| gfx::Insets insets = View::GetInsets(); |
| if (focus_behavior() != FocusBehavior::NEVER) { |
| insets += gfx::Insets(kFocusBorderPadding, kFocusBorderPadding, |
| kFocusBorderPadding, kFocusBorderPadding); |
| } |
| return insets; |
| } |
| |
| int Label::GetBaseline() const { |
| return GetInsets().top() + font_list().GetBaseline(); |
| } |
| |
| gfx::Size Label::GetPreferredSize() const { |
| // Return a size of (0, 0) if the label is not visible and if the |
| // |collapse_when_hidden_| flag is set. |
| // TODO(munjal): This logic probably belongs to the View class. But for now, |
| // put it here since putting it in View class means all inheriting classes |
| // need to respect the |collapse_when_hidden_| flag. |
| if (!visible() && collapse_when_hidden_) |
| return gfx::Size(); |
| |
| if (multi_line() && fixed_width_ != 0 && !text().empty()) |
| return gfx::Size(fixed_width_, GetHeightForWidth(fixed_width_)); |
| |
| gfx::Size size(GetTextSize()); |
| const gfx::Insets insets = GetInsets(); |
| size.Enlarge(insets.width(), insets.height()); |
| |
| if (multi_line() && max_width_ != 0 && max_width_ < size.width()) |
| return gfx::Size(max_width_, GetHeightForWidth(max_width_)); |
| |
| return size; |
| } |
| |
| gfx::Size Label::GetMinimumSize() const { |
| if (!visible() && collapse_when_hidden_) |
| return gfx::Size(); |
| |
| gfx::Size size(0, font_list().GetHeight()); |
| if (elide_behavior_ == gfx::ELIDE_HEAD || |
| elide_behavior_ == gfx::ELIDE_MIDDLE || |
| elide_behavior_ == gfx::ELIDE_TAIL || |
| elide_behavior_ == gfx::ELIDE_EMAIL) { |
| size.set_width(gfx::Canvas::GetStringWidth( |
| base::string16(gfx::kEllipsisUTF16), font_list())); |
| } |
| if (!multi_line()) |
| size.SetToMin(GetTextSize()); |
| size.Enlarge(GetInsets().width(), GetInsets().height()); |
| return size; |
| } |
| |
| int Label::GetHeightForWidth(int w) const { |
| if (!visible() && collapse_when_hidden_) |
| return 0; |
| |
| w -= GetInsets().width(); |
| int height = 0; |
| if (!multi_line() || text().empty() || w <= 0) { |
| height = std::max(line_height(), font_list().GetHeight()); |
| } else if (render_text_->MultilineSupported()) { |
| // SetDisplayRect() has a side effect for later calls of GetStringSize(). |
| // Be careful to invoke |render_text_->SetDisplayRect(gfx::Rect())| to |
| // cancel this effect before the next time GetStringSize() is called. |
| // It would be beneficial not to cancel here, considering that some layout |
| // managers invoke GetHeightForWidth() for the same width multiple times |
| // and |render_text_| can cache the height. |
| render_text_->SetDisplayRect(gfx::Rect(0, 0, w, 0)); |
| height = render_text_->GetStringSize().height(); |
| } else { |
| std::vector<base::string16> lines = GetLinesForWidth(w); |
| height = lines.size() * std::max(line_height(), font_list().GetHeight()); |
| } |
| height -= gfx::ShadowValue::GetMargin(render_text_->shadows()).height(); |
| return height + GetInsets().height(); |
| } |
| |
| void Label::Layout() { |
| ClearRenderTextLines(); |
| } |
| |
| const char* Label::GetClassName() const { |
| return kViewClassName; |
| } |
| |
| View* Label::GetTooltipHandlerForPoint(const gfx::Point& point) { |
| if (!handles_tooltips_ || |
| (tooltip_text_.empty() && !ShouldShowDefaultTooltip())) |
| return NULL; |
| |
| return HitTestPoint(point) ? this : NULL; |
| } |
| |
| bool Label::CanProcessEventsWithinSubtree() const { |
| return !!GetRenderTextForSelectionController(); |
| } |
| |
| WordLookupClient* Label::GetWordLookupClient() { |
| return this; |
| } |
| |
| void Label::GetAccessibleNodeData(ui::AXNodeData* node_data) { |
| node_data->role = ui::AX_ROLE_STATIC_TEXT; |
| node_data->AddStateFlag(ui::AX_STATE_READ_ONLY); |
| // Note that |render_text_| is never elided (see the comment in Init() too). |
| node_data->SetName(render_text_->GetDisplayText()); |
| } |
| |
| bool Label::GetTooltipText(const gfx::Point& p, base::string16* tooltip) const { |
| if (!handles_tooltips_) |
| return false; |
| |
| if (!tooltip_text_.empty()) { |
| tooltip->assign(tooltip_text_); |
| return true; |
| } |
| |
| if (ShouldShowDefaultTooltip()) { |
| // Note that |render_text_| is never elided (see the comment in Init() too). |
| tooltip->assign(render_text_->GetDisplayText()); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void Label::OnEnabledChanged() { |
| ApplyTextColors(); |
| View::OnEnabledChanged(); |
| } |
| |
| std::unique_ptr<gfx::RenderText> Label::CreateRenderText( |
| const base::string16& text, |
| gfx::HorizontalAlignment alignment, |
| gfx::DirectionalityMode directionality, |
| gfx::ElideBehavior elide_behavior) const { |
| std::unique_ptr<gfx::RenderText> render_text( |
| render_text_->CreateInstanceOfSameType()); |
| render_text->SetHorizontalAlignment(alignment); |
| render_text->SetDirectionalityMode(directionality); |
| render_text->SetElideBehavior(elide_behavior); |
| render_text->SetObscured(obscured()); |
| render_text->SetMinLineHeight(line_height()); |
| render_text->SetFontList(font_list()); |
| render_text->set_shadows(shadows()); |
| render_text->SetCursorEnabled(false); |
| render_text->SetText(text); |
| return render_text; |
| } |
| |
| void Label::PaintText(gfx::Canvas* canvas) { |
| MaybeBuildRenderTextLines(); |
| |
| for (size_t i = 0; i < lines_.size(); ++i) |
| lines_[i]->Draw(canvas); |
| |
| #if DCHECK_IS_ON() |
| // Attempt to ensure that if we're using subpixel rendering, we're painting |
| // to an opaque background. What we don't want to find is an ancestor in the |
| // hierarchy that paints to a non-opaque layer. |
| if (lines_.empty() || lines_[0]->subpixel_rendering_suppressed()) |
| return; |
| |
| for (View* view = this; view; view = view->parent()) { |
| if (view->background() && |
| SkColorGetA(view->background()->get_color()) == SK_AlphaOPAQUE) |
| break; |
| |
| if (view->layer() && view->layer()->fills_bounds_opaquely()) { |
| DLOG(WARNING) << "Ancestor view has a non-opaque layer: " |
| << view->GetClassName() << " with ID " << view->id(); |
| break; |
| } |
| } |
| #endif |
| } |
| |
| void Label::OnBoundsChanged(const gfx::Rect& previous_bounds) { |
| if (previous_bounds.size() != size()) |
| InvalidateLayout(); |
| } |
| |
| void Label::OnPaint(gfx::Canvas* canvas) { |
| View::OnPaint(canvas); |
| if (is_first_paint_text_) { |
| // TODO(ckocagil): Remove ScopedTracker below once crbug.com/441028 is |
| // fixed. |
| tracked_objects::ScopedTracker tracking_profile( |
| FROM_HERE_WITH_EXPLICIT_FUNCTION("441028 First PaintText()")); |
| |
| is_first_paint_text_ = false; |
| PaintText(canvas); |
| } else { |
| PaintText(canvas); |
| } |
| |
| // Check for IsAccessibilityFocusable() to prevent drawing a focus rect for |
| // non-focusable labels with selection, which are given focus explicitly in |
| // OnMousePressed. |
| if (HasFocus() && !ui::MaterialDesignController::IsSecondaryUiMaterial() && |
| IsAccessibilityFocusable()) { |
| canvas->DrawFocusRect(GetFocusBounds()); |
| } |
| } |
| |
| void Label::OnNativeThemeChanged(const ui::NativeTheme* theme) { |
| UpdateColorsFromTheme(theme); |
| } |
| |
| gfx::NativeCursor Label::GetCursor(const ui::MouseEvent& event) { |
| return GetRenderTextForSelectionController() ? GetNativeIBeamCursor() |
| : gfx::kNullCursor; |
| } |
| |
| void Label::OnFocus() { |
| gfx::RenderText* render_text = GetRenderTextForSelectionController(); |
| if (render_text) { |
| render_text->set_focused(true); |
| SchedulePaint(); |
| } |
| View::OnFocus(); |
| } |
| |
| void Label::OnBlur() { |
| gfx::RenderText* render_text = GetRenderTextForSelectionController(); |
| if (render_text) { |
| render_text->set_focused(false); |
| SchedulePaint(); |
| } |
| View::OnBlur(); |
| } |
| |
| bool Label::OnMousePressed(const ui::MouseEvent& event) { |
| if (!GetRenderTextForSelectionController()) |
| return false; |
| |
| const bool had_focus = HasFocus(); |
| |
| // RequestFocus() won't work when the label has FocusBehavior::NEVER. Hence |
| // explicitly set the focused view. |
| // TODO(karandeepb): If a widget with a label having FocusBehavior::NEVER as |
| // the currently focused view (due to selection) was to lose focus, focus |
| // won't be restored to the label (and hence a text selection won't be drawn) |
| // when the widget gets focus again. Fix this. |
| // Tracked in https://crbug.com/630365. |
| if ((event.IsOnlyLeftMouseButton() || event.IsOnlyRightMouseButton()) && |
| GetFocusManager() && !had_focus) { |
| GetFocusManager()->SetFocusedView(this); |
| } |
| |
| #if defined(OS_LINUX) && !defined(OS_CHROMEOS) |
| if (event.IsOnlyMiddleMouseButton() && GetFocusManager() && !had_focus) |
| GetFocusManager()->SetFocusedView(this); |
| #endif |
| |
| return selection_controller_->OnMousePressed( |
| event, false, had_focus ? SelectionController::FOCUSED |
| : SelectionController::UNFOCUSED); |
| } |
| |
| bool Label::OnMouseDragged(const ui::MouseEvent& event) { |
| if (!GetRenderTextForSelectionController()) |
| return false; |
| |
| return selection_controller_->OnMouseDragged(event); |
| } |
| |
| void Label::OnMouseReleased(const ui::MouseEvent& event) { |
| if (!GetRenderTextForSelectionController()) |
| return; |
| |
| selection_controller_->OnMouseReleased(event); |
| } |
| |
| void Label::OnMouseCaptureLost() { |
| if (!GetRenderTextForSelectionController()) |
| return; |
| |
| selection_controller_->OnMouseCaptureLost(); |
| } |
| |
| bool Label::OnKeyPressed(const ui::KeyEvent& event) { |
| if (!GetRenderTextForSelectionController()) |
| return false; |
| |
| const bool shift = event.IsShiftDown(); |
| const bool control = event.IsControlDown(); |
| const bool alt = event.IsAltDown() || event.IsAltGrDown(); |
| |
| switch (event.key_code()) { |
| case ui::VKEY_C: |
| if (control && !alt && HasSelection()) { |
| CopyToClipboard(); |
| return true; |
| } |
| break; |
| case ui::VKEY_INSERT: |
| if (control && !shift && HasSelection()) { |
| CopyToClipboard(); |
| return true; |
| } |
| break; |
| case ui::VKEY_A: |
| if (control && !alt && !text().empty()) { |
| SelectAll(); |
| DCHECK(HasSelection()); |
| UpdateSelectionClipboard(); |
| return true; |
| } |
| break; |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| bool Label::AcceleratorPressed(const ui::Accelerator& accelerator) { |
| // Allow the "Copy" action from the Chrome menu to be invoked. E.g., if a user |
| // selects a Label on a web modal dialog. "Select All" doesn't appear in the |
| // Chrome menu so isn't handled here. |
| if (accelerator.key_code() == ui::VKEY_C && accelerator.IsCtrlDown()) { |
| CopyToClipboard(); |
| return true; |
| } |
| return false; |
| } |
| |
| bool Label::CanHandleAccelerators() const { |
| // Focus needs to be checked since the accelerator for the Copy command from |
| // the Chrome menu should only be handled when the current view has focus. See |
| // related comment in BrowserView::CutCopyPaste. |
| return HasFocus() && GetRenderTextForSelectionController() && |
| View::CanHandleAccelerators(); |
| } |
| |
| void Label::OnDeviceScaleFactorChanged(float device_scale_factor) { |
| View::OnDeviceScaleFactorChanged(device_scale_factor); |
| // When the device scale factor is changed, some font rendering parameters is |
| // changed (especially, hinting). The bounding box of the text has to be |
| // re-computed based on the new parameters. See crbug.com/441439 |
| ResetLayout(); |
| } |
| |
| void Label::VisibilityChanged(View* starting_from, bool is_visible) { |
| if (!is_visible) |
| ClearRenderTextLines(); |
| } |
| |
| void Label::ShowContextMenuForView(View* source, |
| const gfx::Point& point, |
| ui::MenuSourceType source_type) { |
| if (!GetRenderTextForSelectionController()) |
| return; |
| |
| context_menu_runner_.reset( |
| new MenuRunner(&context_menu_contents_, MenuRunner::HAS_MNEMONICS | |
| MenuRunner::CONTEXT_MENU | |
| MenuRunner::ASYNC)); |
| ignore_result(context_menu_runner_->RunMenuAt( |
| GetWidget(), nullptr, gfx::Rect(point, gfx::Size()), MENU_ANCHOR_TOPLEFT, |
| source_type)); |
| } |
| |
| bool Label::GetDecoratedWordAtPoint(const gfx::Point& point, |
| gfx::DecoratedText* decorated_word, |
| gfx::Point* baseline_point) { |
| gfx::RenderText* render_text = GetRenderTextForSelectionController(); |
| return render_text |
| ? render_text->GetDecoratedWordAtPoint(point, decorated_word, |
| baseline_point) |
| : false; |
| } |
| |
| gfx::RenderText* Label::GetRenderTextForSelectionController() { |
| return const_cast<gfx::RenderText*>( |
| static_cast<const Label*>(this)->GetRenderTextForSelectionController()); |
| } |
| |
| bool Label::IsReadOnly() const { |
| return true; |
| } |
| |
| bool Label::SupportsDrag() const { |
| // TODO(crbug.com/661379): Labels should support dragging selected text. |
| return false; |
| } |
| |
| bool Label::HasTextBeingDragged() const { |
| return false; |
| } |
| |
| void Label::SetTextBeingDragged(bool value) { |
| NOTREACHED(); |
| } |
| |
| int Label::GetViewHeight() const { |
| return height(); |
| } |
| |
| int Label::GetViewWidth() const { |
| return width(); |
| } |
| |
| int Label::GetDragSelectionDelay() const { |
| // Labels don't need to use a repeating timer to update the drag selection. |
| // Since the cursor is disabled for labels, a selection outside the display |
| // area won't change the text in the display area. It is expected that all the |
| // text will fit in the display area for labels anyway. |
| return 0; |
| } |
| |
| void Label::OnBeforePointerAction() {} |
| |
| void Label::OnAfterPointerAction(bool text_changed, bool selection_changed) { |
| DCHECK(!text_changed); |
| if (selection_changed) |
| SchedulePaint(); |
| } |
| |
| bool Label::PasteSelectionClipboard() { |
| NOTREACHED(); |
| return false; |
| } |
| |
| void Label::UpdateSelectionClipboard() { |
| #if defined(OS_LINUX) && !defined(OS_CHROMEOS) |
| if (!obscured()) { |
| ui::ScopedClipboardWriter(ui::CLIPBOARD_TYPE_SELECTION) |
| .WriteText(GetSelectedText()); |
| } |
| #endif |
| } |
| |
| bool Label::IsCommandIdChecked(int command_id) const { |
| return true; |
| } |
| |
| bool Label::IsCommandIdEnabled(int command_id) const { |
| switch (command_id) { |
| case IDS_APP_COPY: |
| return HasSelection() && !obscured(); |
| case IDS_APP_SELECT_ALL: |
| return GetRenderTextForSelectionController() && !text().empty(); |
| } |
| return false; |
| } |
| |
| void Label::ExecuteCommand(int command_id, int event_flags) { |
| switch (command_id) { |
| case IDS_APP_COPY: |
| CopyToClipboard(); |
| break; |
| case IDS_APP_SELECT_ALL: |
| SelectAll(); |
| DCHECK(HasSelection()); |
| UpdateSelectionClipboard(); |
| break; |
| default: |
| NOTREACHED(); |
| } |
| } |
| |
| bool Label::GetAcceleratorForCommandId(int command_id, |
| ui::Accelerator* accelerator) const { |
| switch (command_id) { |
| case IDS_APP_COPY: |
| *accelerator = ui::Accelerator(ui::VKEY_C, ui::EF_CONTROL_DOWN); |
| return true; |
| |
| case IDS_APP_SELECT_ALL: |
| *accelerator = ui::Accelerator(ui::VKEY_A, ui::EF_CONTROL_DOWN); |
| return true; |
| |
| default: |
| return false; |
| } |
| } |
| |
| const gfx::RenderText* Label::GetRenderTextForSelectionController() const { |
| if (!selectable()) |
| return nullptr; |
| MaybeBuildRenderTextLines(); |
| |
| // This may happen when the content bounds of the view are empty. |
| if (lines_.empty()) |
| return nullptr; |
| |
| DCHECK_EQ(1u, lines_.size()); |
| return lines_[0].get(); |
| } |
| |
| void Label::Init(const base::string16& text, const gfx::FontList& font_list) { |
| render_text_.reset(gfx::RenderText::CreateInstance()); |
| render_text_->SetHorizontalAlignment(gfx::ALIGN_CENTER); |
| render_text_->SetDirectionalityMode(gfx::DIRECTIONALITY_FROM_TEXT); |
| // NOTE: |render_text_| should not be elided at all. This is used to keep some |
| // properties and to compute the size of the string. |
| render_text_->SetElideBehavior(gfx::NO_ELIDE); |
| render_text_->SetFontList(font_list); |
| render_text_->SetCursorEnabled(false); |
| render_text_->SetWordWrapBehavior(gfx::TRUNCATE_LONG_WORDS); |
| |
| elide_behavior_ = gfx::ELIDE_TAIL; |
| stored_selection_range_ = gfx::Range::InvalidRange(); |
| enabled_color_set_ = disabled_color_set_ = background_color_set_ = false; |
| selection_text_color_set_ = selection_background_color_set_ = false; |
| subpixel_rendering_enabled_ = true; |
| auto_color_readability_ = true; |
| multi_line_ = false; |
| UpdateColorsFromTheme(GetNativeTheme()); |
| handles_tooltips_ = true; |
| collapse_when_hidden_ = false; |
| fixed_width_ = 0; |
| max_width_ = 0; |
| is_first_paint_text_ = true; |
| SetText(text); |
| |
| // Only selectable labels will get requests to show the context menu, due to |
| // CanProcessEventsWithinSubtree(). |
| BuildContextMenuContents(); |
| set_context_menu_controller(this); |
| |
| // This allows the BrowserView to pass the copy command from the Chrome menu |
| // to the Label. |
| AddAccelerator(ui::Accelerator(ui::VKEY_C, ui::EF_CONTROL_DOWN)); |
| } |
| |
| void Label::ResetLayout() { |
| InvalidateLayout(); |
| PreferredSizeChanged(); |
| SchedulePaint(); |
| ClearRenderTextLines(); |
| } |
| |
| void Label::MaybeBuildRenderTextLines() const { |
| if (!lines_.empty()) |
| return; |
| |
| gfx::Rect rect = GetContentsBounds(); |
| if (focus_behavior() != FocusBehavior::NEVER) |
| rect.Inset(kFocusBorderPadding, kFocusBorderPadding); |
| if (rect.IsEmpty()) |
| return; |
| rect.Inset(-gfx::ShadowValue::GetMargin(shadows())); |
| |
| gfx::HorizontalAlignment alignment = horizontal_alignment(); |
| gfx::DirectionalityMode directionality = render_text_->directionality_mode(); |
| if (multi_line()) { |
| // Force the directionality and alignment of the first line on other lines. |
| bool rtl = |
| render_text_->GetDisplayTextDirection() == base::i18n::RIGHT_TO_LEFT; |
| if (alignment == gfx::ALIGN_TO_HEAD) |
| alignment = rtl ? gfx::ALIGN_RIGHT : gfx::ALIGN_LEFT; |
| directionality = |
| rtl ? gfx::DIRECTIONALITY_FORCE_RTL : gfx::DIRECTIONALITY_FORCE_LTR; |
| } |
| |
| // Text eliding is not supported for multi-lined Labels. |
| // TODO(mukai): Add multi-lined elided text support. |
| gfx::ElideBehavior elide_behavior = |
| multi_line() ? gfx::NO_ELIDE : elide_behavior_; |
| if (!multi_line() || render_text_->MultilineSupported()) { |
| std::unique_ptr<gfx::RenderText> render_text = |
| CreateRenderText(text(), alignment, directionality, elide_behavior); |
| render_text->SetDisplayRect(rect); |
| render_text->SetMultiline(multi_line()); |
| render_text->SetWordWrapBehavior(render_text_->word_wrap_behavior()); |
| |
| // Setup render text for selection controller. |
| if (selectable()) { |
| render_text->set_focused(HasFocus()); |
| if (stored_selection_range_.IsValid()) |
| render_text->SelectRange(stored_selection_range_); |
| } |
| |
| lines_.push_back(std::move(render_text)); |
| } else { |
| std::vector<base::string16> lines = GetLinesForWidth(rect.width()); |
| if (lines.size() > 1) |
| rect.set_height(std::max(line_height(), font_list().GetHeight())); |
| |
| const int bottom = GetContentsBounds().bottom(); |
| for (size_t i = 0; i < lines.size() && rect.y() <= bottom; ++i) { |
| std::unique_ptr<gfx::RenderText> line = |
| CreateRenderText(lines[i], alignment, directionality, elide_behavior); |
| line->SetDisplayRect(rect); |
| lines_.push_back(std::move(line)); |
| rect.set_y(rect.y() + rect.height()); |
| } |
| // Append the remaining text to the last visible line. |
| for (size_t i = lines_.size(); i < lines.size(); ++i) |
| lines_.back()->SetText(lines_.back()->text() + lines[i]); |
| } |
| |
| stored_selection_range_ = gfx::Range::InvalidRange(); |
| ApplyTextColors(); |
| } |
| |
| gfx::Rect Label::GetFocusBounds() const { |
| MaybeBuildRenderTextLines(); |
| |
| gfx::Rect focus_bounds; |
| if (lines_.empty()) { |
| focus_bounds = gfx::Rect(GetTextSize()); |
| } else { |
| for (size_t i = 0; i < lines_.size(); ++i) { |
| gfx::Point origin; |
| origin += lines_[i]->GetLineOffset(0); |
| focus_bounds.Union(gfx::Rect(origin, lines_[i]->GetStringSize())); |
| } |
| } |
| |
| focus_bounds.Inset(-kFocusBorderPadding, -kFocusBorderPadding); |
| focus_bounds.Intersect(GetLocalBounds()); |
| return focus_bounds; |
| } |
| |
| std::vector<base::string16> Label::GetLinesForWidth(int width) const { |
| std::vector<base::string16> lines; |
| // |width| can be 0 when getting the default text size, in that case |
| // the ideal lines (i.e. broken at newline characters) are wanted. |
| if (width <= 0) { |
| lines = base::SplitString( |
| render_text_->GetDisplayText(), base::string16(1, '\n'), |
| base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL); |
| } else { |
| gfx::ElideRectangleText(render_text_->GetDisplayText(), font_list(), width, |
| std::numeric_limits<int>::max(), |
| render_text_->word_wrap_behavior(), &lines); |
| } |
| return lines; |
| } |
| |
| gfx::Size Label::GetTextSize() const { |
| gfx::Size size; |
| if (text().empty()) { |
| size = gfx::Size(0, std::max(line_height(), font_list().GetHeight())); |
| } else if (!multi_line() || render_text_->MultilineSupported()) { |
| // Cancel the display rect of |render_text_|. The display rect may be |
| // specified in GetHeightForWidth(), and specifying empty Rect cancels |
| // its effect. See also the comment in GetHeightForWidth(). |
| // TODO(mukai): use gfx::Rect() to compute the ideal size rather than |
| // the current width(). See crbug.com/468494, crbug.com/467526, and |
| // the comment for MultilinePreferredSizeTest in label_unittest.cc. |
| render_text_->SetDisplayRect(gfx::Rect(0, 0, width(), 0)); |
| size = render_text_->GetStringSize(); |
| } else { |
| // Get the natural text size, unelided and only wrapped on newlines. |
| std::vector<base::string16> lines = GetLinesForWidth(width()); |
| std::unique_ptr<gfx::RenderText> render_text( |
| gfx::RenderText::CreateInstance()); |
| render_text->SetFontList(font_list()); |
| for (size_t i = 0; i < lines.size(); ++i) { |
| render_text->SetText(lines[i]); |
| const gfx::Size line = render_text->GetStringSize(); |
| size.set_width(std::max(size.width(), line.width())); |
| size.set_height(std::max(line_height(), size.height() + line.height())); |
| } |
| } |
| const gfx::Insets shadow_margin = -gfx::ShadowValue::GetMargin(shadows()); |
| size.Enlarge(shadow_margin.width(), shadow_margin.height()); |
| return size; |
| } |
| |
| void Label::RecalculateColors() { |
| actual_enabled_color_ = auto_color_readability_ ? |
| color_utils::GetReadableColor(requested_enabled_color_, |
| background_color_) : |
| requested_enabled_color_; |
| actual_disabled_color_ = auto_color_readability_ ? |
| color_utils::GetReadableColor(requested_disabled_color_, |
| background_color_) : |
| requested_disabled_color_; |
| actual_selection_text_color_ = |
| auto_color_readability_ |
| ? color_utils::GetReadableColor(requested_selection_text_color_, |
| selection_background_color_) |
| : requested_selection_text_color_; |
| |
| ApplyTextColors(); |
| SchedulePaint(); |
| } |
| |
| void Label::ApplyTextColors() const { |
| SkColor color = enabled() ? actual_enabled_color_ : actual_disabled_color_; |
| bool subpixel_rendering_suppressed = |
| SkColorGetA(background_color_) != SK_AlphaOPAQUE || |
| !subpixel_rendering_enabled_; |
| for (size_t i = 0; i < lines_.size(); ++i) { |
| lines_[i]->SetColor(color); |
| lines_[i]->set_selection_color(actual_selection_text_color_); |
| lines_[i]->set_selection_background_focused_color( |
| selection_background_color_); |
| lines_[i]->set_subpixel_rendering_suppressed(subpixel_rendering_suppressed); |
| } |
| } |
| |
| void Label::UpdateColorsFromTheme(const ui::NativeTheme* theme) { |
| if (!enabled_color_set_) { |
| requested_enabled_color_ = theme->GetSystemColor( |
| ui::NativeTheme::kColorId_LabelEnabledColor); |
| } |
| if (!disabled_color_set_) { |
| requested_disabled_color_ = theme->GetSystemColor( |
| ui::NativeTheme::kColorId_LabelDisabledColor); |
| } |
| if (!background_color_set_) { |
| background_color_ = |
| theme->GetSystemColor(ui::NativeTheme::kColorId_DialogBackground); |
| } |
| if (!selection_text_color_set_) { |
| requested_selection_text_color_ = theme->GetSystemColor( |
| ui::NativeTheme::kColorId_LabelTextSelectionColor); |
| } |
| if (!selection_background_color_set_) { |
| selection_background_color_ = theme->GetSystemColor( |
| ui::NativeTheme::kColorId_LabelTextSelectionBackgroundFocused); |
| } |
| RecalculateColors(); |
| } |
| |
| bool Label::ShouldShowDefaultTooltip() const { |
| const gfx::Size text_size = GetTextSize(); |
| const gfx::Size size = GetContentsBounds().size(); |
| return !obscured() && (text_size.width() > size.width() || |
| (multi_line() && text_size.height() > size.height())); |
| } |
| |
| void Label::ClearRenderTextLines() const { |
| // The HasSelection() call below will build |lines_| in case it is empty. |
| // Return early to avoid this. |
| if (lines_.empty()) |
| return; |
| |
| // Persist the selection range if there is an active selection. |
| if (HasSelection()) { |
| stored_selection_range_ = |
| GetRenderTextForSelectionController()->selection(); |
| } |
| lines_.clear(); |
| } |
| |
| base::string16 Label::GetSelectedText() const { |
| const gfx::RenderText* render_text = GetRenderTextForSelectionController(); |
| return render_text ? render_text->GetTextFromRange(render_text->selection()) |
| : base::string16(); |
| } |
| |
| void Label::CopyToClipboard() { |
| if (!HasSelection() || obscured()) |
| return; |
| ui::ScopedClipboardWriter(ui::CLIPBOARD_TYPE_COPY_PASTE) |
| .WriteText(GetSelectedText()); |
| } |
| |
| void Label::BuildContextMenuContents() { |
| context_menu_contents_.AddItemWithStringId(IDS_APP_COPY, IDS_APP_COPY); |
| context_menu_contents_.AddItemWithStringId(IDS_APP_SELECT_ALL, |
| IDS_APP_SELECT_ALL); |
| } |
| |
| } // namespace views |