// 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 #include "base/debug/trace_event.h" #include "base/logging.h" #include "base/memory/scoped_ptr.h" #include "base/message_loop.h" #include "base/stringprintf.h" #include "base/utf_string_conversions.h" #include "third_party/skia/include/core/SkRect.h" #include "ui/base/accessibility/accessibility_types.h" #include "ui/base/dragdrop/drag_drop_types.h" #include "ui/gfx/canvas_skia.h" #include "ui/gfx/compositor/compositor.h" #include "ui/gfx/compositor/layer.h" #include "ui/gfx/compositor/layer_animator.h" #include "ui/gfx/interpolated_transform.h" #include "ui/gfx/path.h" #include "ui/gfx/point3.h" #include "ui/gfx/transform.h" #include "ui/views/background.h" #include "ui/views/context_menu_controller.h" #include "ui/views/drag_controller.h" #include "ui/views/layout/layout_manager.h" #include "ui/views/views_delegate.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/views/accessibility/native_view_accessibility_win.h" #endif #if defined(TOOLKIT_USES_GTK) #include "ui/base/gtk/scoped_handle_gtk.h" #endif namespace { // Whether to use accelerated compositing when necessary (e.g. when a view has a // transformation). #if defined(VIEWS_COMPOSITOR) bool use_acceleration_when_possible = true; #else bool use_acceleration_when_possible = false; #endif // Saves the drawing state, and restores the state when going out of scope. class ScopedCanvas { public: explicit ScopedCanvas(gfx::Canvas* canvas) : canvas_(canvas) { if (canvas_) canvas_->Save(); } ~ScopedCanvas() { if (canvas_) canvas_->Restore(); } void SetCanvas(gfx::Canvas* canvas) { if (canvas_) canvas_->Restore(); canvas_ = canvas; canvas_->Save(); } private: gfx::Canvas* canvas_; DISALLOW_COPY_AND_ASSIGN(ScopedCanvas); }; // Returns the top view in |view|'s hierarchy. const views::View* GetHierarchyRoot(const views::View* view) { const views::View* root = view; while (root && root->parent()) root = root->parent(); return root; } } // namespace namespace views { // static ViewsDelegate* ViewsDelegate::views_delegate = NULL; // static const char View::kViewClassName[] = "views/View"; //////////////////////////////////////////////////////////////////////////////// // View, public: // TO BE MOVED ----------------------------------------------------------------- void View::SetHotTracked(bool flag) { } bool View::IsHotTracked() const { return false; } // Creation and lifetime ------------------------------------------------------- View::View() : parent_owned_(true), id_(0), group_(-1), parent_(NULL), visible_(true), enabled_(true), painting_enabled_(true), registered_for_visible_bounds_notification_(false), clip_insets_(0, 0, 0, 0), needs_layout_(true), flip_canvas_on_paint_for_rtl_ui_(false), paint_to_layer_(false), accelerator_registration_delayed_(false), accelerator_focus_manager_(NULL), registered_accelerator_count_(0), next_focusable_view_(NULL), previous_focusable_view_(NULL), focusable_(false), accessibility_focusable_(false), context_menu_controller_(NULL), drag_controller_(NULL) { } View::~View() { if (parent_) parent_->RemoveChildView(this); for (Views::const_iterator i(children_.begin()); i != children_.end(); ++i) { (*i)->parent_ = NULL; if ((*i)->parent_owned()) delete *i; } #if defined(OS_WIN) if (native_view_accessibility_win_.get()) native_view_accessibility_win_->set_view(NULL); #endif } // 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(const_cast(this)->GetWidget()); } void View::AddChildView(View* view) { AddChildViewAt(view, child_count()); } void View::AddChildViewAt(View* view, int index) { CHECK_NE(view, this) << "You cannot add a view as its own child"; // If |view| has a parent, remove it from its parent. View* parent = view->parent_; if (parent) parent->RemoveChildView(view); // Sets the prev/next focus views. InitFocusSiblings(view, index); // Let's insert the view. view->parent_ = this; children_.insert(children_.begin() + index, view); for (View* v = this; v; v = v->parent_) v->ViewHierarchyChangedImpl(false, true, this, view); view->PropagateAddNotifications(this, view); UpdateTooltip(); if (GetWidget()) RegisterChildrenForVisibleBoundsNotification(view); if (layout_manager_.get()) layout_manager_->ViewAdded(this, view); if (use_acceleration_when_possible) 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. UpdateLayerVisibility(); } 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()); 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); if (use_acceleration_when_possible) ReorderLayers(); } void View::RemoveChildView(View* view) { DoRemoveChildView(view, true, true, false); } void View::RemoveAllChildViews(bool delete_children) { while (!children_.empty()) DoRemoveChildView(children_.front(), false, false, delete_children); 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(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(); SchedulePaint(); } 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); } 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()) { gfx::Insets insets; border_->GetInsets(&insets); contents_bounds.Inset(insets); } return contents_bounds; } gfx::Rect View::GetLocalBounds() const { return gfx::Rect(gfx::Point(), size()); } gfx::Insets View::GetInsets() const { gfx::Insets insets; if (border_.get()) border_->GetInsets(&insets); return insets; } gfx::Rect View::GetVisibleBounds() const { if (!IsDrawn()) return gfx::Rect(); gfx::Rect vis_bounds(0, 0, width(), height()); gfx::Rect ancestor_bounds; const View* view = this; ui::Transform transform; while (view != NULL && !vis_bounds.IsEmpty()) { transform.ConcatTransform(view->GetTransform()); transform.ConcatTranslate(static_cast(view->GetMirroredX()), static_cast(view->y())); 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 = 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. transform.TransformRectReverse(&vis_bounds); return vis_bounds; } gfx::Rect View::GetScreenBounds() const { gfx::Point origin; View::ConvertPointToScreen(this, &origin); return gfx::Rect(origin, size()); } gfx::Size View::GetPreferredSize() { if (layout_manager_.get()) return layout_manager_->GetPreferredSize(this); return gfx::Size(); } int View::GetBaseline() const { return -1; } 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() { return GetPreferredSize(); } int View::GetHeightForWidth(int w) { 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; // 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; OnEnabledChanged(); } } void View::OnEnabledChanged() { SchedulePaint(); } // Transformations ------------------------------------------------------------- const ui::Transform& View::GetTransform() const { static const ui::Transform* no_op = new ui::Transform; return layer() ? layer()->transform() : *no_op; } void View::SetTransform(const ui::Transform& transform) { if (!transform.HasChange()) { if (layer()) { layer()->SetTransform(transform); if (!paint_to_layer_) DestroyLayer(); } else { // Nothing. } } else { if (!layer()) CreateLayer(); layer()->SetTransform(transform); layer()->ScheduleDraw(); } } void View::SetPaintToLayer(bool paint_to_layer) { paint_to_layer_ = paint_to_layer; if (paint_to_layer_ && !layer()) { CreateLayer(); } else if (!paint_to_layer_ && layer()) { DestroyLayer(); } } // 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& bounds) const { return base::i18n::IsRTL() ? (width() - bounds.x() - bounds.width()) : bounds.x(); } 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. for (int i = 0, count = child_count(); i < count; ++i) { View* child = child_at(i); if (child->needs_layout_ || !layout_manager_.get()) { 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(LayoutManager* layout_manager) { if (layout_manager_.get()) layout_manager_->Uninstalled(this); layout_manager_.reset(layout_manager); if (layout_manager_.get()) layout_manager_->Installed(this); } // Attributes ------------------------------------------------------------------ std::string View::GetClassName() const { return kViewClassName; } View* View::GetAncestorWithClassName(const std::string& name) { for (View* view = this; view; view = view->parent_) { if (view->GetClassName() == name) return view; } return NULL; } const View* View::GetViewByID(int id) const { if (id == id_) return const_cast(this); for (int i = 0, count = child_count(); i < count; ++i) { const View* view = child_at(i)->GetViewByID(id); if (view) return view; } return NULL; } View* View::GetViewByID(int id) { return const_cast(const_cast(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); for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->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::ConvertPointToView(const View* source, const View* target, gfx::Point* point) { if (source == target) return; // |source| can be NULL. const View* root = GetHierarchyRoot(target); if (source) { CHECK_EQ(GetHierarchyRoot(source), root); if (source != root) source->ConvertPointForAncestor(root, point); } if (target != root) target->ConvertPointFromAncestor(root, point); // API defines NULL |source| as returning the point in screen coordinates. if (!source) { *point = point->Subtract( root->GetWidget()->GetClientAreaScreenBounds().origin()); } } // 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); gfx::Rect r = widget->GetClientAreaScreenBounds(); p->SetPoint(p->x() + r.x(), p->y() + r.y()); } } // static void View::ConvertPointFromScreen(const View* dst, gfx::Point* p) { DCHECK(dst); DCHECK(p); const views::Widget* widget = dst->GetWidget(); if (!widget) return; const gfx::Rect r = widget->GetClientAreaScreenBounds(); p->Offset(-r.x(), -r.y()); views::View::ConvertPointFromWidget(dst, p); } gfx::Rect View::ConvertRectToParent(const gfx::Rect& rect) const { gfx::Rect x_rect = rect; GetTransform().TransformRect(&x_rect); x_rect.Offset(GetMirroredPosition()); return 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_ || !painting_enabled_) 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(gfx::Canvas* canvas) { TRACE_EVENT0("views", "View::Paint"); ScopedCanvas scoped_canvas(canvas); // Paint this View and its children, setting the clip rect to the bounds // of this View and translating the origin to the local bounds' top left // point. // // Note that the X (or left) position we pass to ClipRectInt takes into // consideration whether or not the view uses a right-to-left layout so that // we paint our view in its mirrored position if need be. gfx::Rect clip_rect = bounds(); clip_rect.Inset(clip_insets_); if (parent_) clip_rect.set_x(parent_->GetMirroredXForRect(clip_rect)); if (!canvas->ClipRect(clip_rect)) return; // Non-empty clip, translate the graphics such that 0,0 corresponds to // where this view is located (related to its parent). canvas->Translate(GetMirroredPosition()); canvas->Transform(GetTransform()); PaintCommon(canvas); } ThemeProvider* View::GetThemeProvider() const { const Widget* widget = GetWidget(); return widget ? widget->GetThemeProvider() : NULL; } // Accelerated Painting -------------------------------------------------------- // static void View::set_use_acceleration_when_possible(bool use) { use_acceleration_when_possible = use; } // static bool View::get_use_acceleration_when_possible() { return use_acceleration_when_possible; } // Input ----------------------------------------------------------------------- View* View::GetEventHandlerForPoint(const gfx::Point& point) { // Walk the child Views recursively looking for the View that most // tightly encloses the specified point. for (int i = child_count() - 1; i >= 0; --i) { View* child = child_at(i); if (!child->visible()) continue; gfx::Point point_in_child_coords(point); View::ConvertPointToView(this, child, &point_in_child_coords); if (child->HitTest(point_in_child_coords)) return child->GetEventHandlerForPoint(point_in_child_coords); } return this; } gfx::NativeCursor View::GetCursor(const MouseEvent& event) { #if defined(OS_WIN) && !defined(USE_AURA) static HCURSOR arrow = LoadCursor(NULL, IDC_ARROW); return arrow; #else return gfx::kNullCursor; #endif } bool View::HitTest(const gfx::Point& l) const { if (GetLocalBounds().Contains(l)) { if (HasHitTestMask()) { gfx::Path mask; GetHitTestMask(&mask); #if defined(USE_AURA) // TODO: should we use this every where? SkRegion clip_region; clip_region.setRect(0, 0, width(), height()); SkRegion mask_region; return mask_region.setPath(mask, clip_region) && mask_region.contains(l.x(), l.y()); #elif defined(OS_WIN) base::win::ScopedRegion rgn(mask.CreateNativeRegion()); return !!PtInRegion(rgn, l.x(), l.y()); #elif defined(TOOLKIT_USES_GTK) ui::ScopedRegion rgn(mask.CreateNativeRegion()); return gdk_region_point_in(rgn.Get(), l.x(), l.y()); #endif } // No mask, but inside our bounds. return true; } // Outside our bounds. return false; } bool View::OnMousePressed(const MouseEvent& event) { return false; } bool View::OnMouseDragged(const MouseEvent& event) { return false; } void View::OnMouseReleased(const MouseEvent& event) { } void View::OnMouseCaptureLost() { } void View::OnMouseMoved(const MouseEvent& event) { } void View::OnMouseEntered(const MouseEvent& event) { } void View::OnMouseExited(const MouseEvent& event) { } ui::TouchStatus View::OnTouchEvent(const TouchEvent& event) { DVLOG(1) << "visited the OnTouchEvent"; return ui::TOUCH_STATUS_UNKNOWN; } ui::GestureStatus View::OnGestureEvent(const GestureEvent& event) { return ui::GESTURE_STATUS_UNKNOWN; } void View::SetMouseHandler(View *new_mouse_handler) { // It is valid for new_mouse_handler to be NULL if (parent_) parent_->SetMouseHandler(new_mouse_handler); } bool View::OnKeyPressed(const KeyEvent& event) { return false; } bool View::OnKeyReleased(const KeyEvent& event) { return false; } bool View::OnMouseWheel(const MouseWheelEvent& event) { return false; } ui::TextInputClient* View::GetTextInputClient() { return NULL; } InputMethod* View::GetInputMethod() { Widget* widget = GetWidget(); return widget ? widget->GetInputMethod() : NULL; } ui::GestureStatus View::ProcessGestureEvent(const GestureEvent& event) { // TODO(Gajen): Implement a grab scheme similar to as as is found in // MousePressed. return OnGestureEvent(event); } // Accelerators ---------------------------------------------------------------- void View::AddAccelerator(const ui::Accelerator& accelerator) { if (!accelerators_.get()) accelerators_.reset(new std::vector()); DCHECK(std::find(accelerators_->begin(), accelerators_->end(), accelerator) == accelerators_->end()) << "Registering the same accelerator multiple times"; accelerators_->push_back(accelerator); RegisterPendingAccelerators(); } void View::RemoveAccelerator(const ui::Accelerator& accelerator) { if (!accelerators_.get()) { NOTREACHED() << "Removing non-existing accelerator"; return; } std::vector::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 { return enabled() && IsDrawn() && GetWidget() && GetWidget()->IsVisible(); } // 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) { view->previous_focusable_view_ = this; next_focusable_view_ = view; } bool View::IsFocusable() const { return focusable_ && enabled_ && IsDrawn(); } bool View::IsAccessibilityFocusable() const { return (focusable_ || accessibility_focusable_) && 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 && IsFocusable()) focus_manager->SetFocusedView(this); } bool View::SkipDefaultKeyEventProcessing(const KeyEvent& event) { return false; } FocusTraversable* View::GetFocusTraversable() { return NULL; } FocusTraversable* View::GetPaneFocusTraversable() { return NULL; } // Tooltips -------------------------------------------------------------------- bool View::GetTooltipText(const gfx::Point& p, 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, bool is_mouse_gesture) { if (!context_menu_controller_) return; context_menu_controller_->ShowContextMenuForView(this, p, is_mouse_gesture); } // Drag and drop --------------------------------------------------------------- bool View::GetDropFormats( int* formats, std::set* custom_formats) { 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 DropTargetEvent& event) { } int View::OnDragUpdated(const DropTargetEvent& event) { return ui::DragDropTypes::DRAG_NONE; } void View::OnDragExited() { } int View::OnPerformDrop(const DropTargetEvent& event) { return ui::DragDropTypes::DRAG_NONE; } void View::OnDragDone() { } // static bool View::ExceededDragThreshold(int delta_x, int delta_y) { return (abs(delta_x) > GetHorizontalDragThreshold() || abs(delta_y) > GetVerticalDragThreshold()); } // 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); } } 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; } //////////////////////////////////////////////////////////////////////////////// // View, protected: // Size and disposition -------------------------------------------------------- void View::OnBoundsChanged(const gfx::Rect& previous_bounds) { } void View::PreferredSizeChanged() { InvalidateLayout(); if (parent_) parent_->ChildPreferredSizeChanged(this); } bool View::NeedsNotificationWhenVisibleBoundsChange() const { return false; } void View::OnVisibleBoundsChanged() { } // Tree operations ------------------------------------------------------------- void View::ViewHierarchyChanged(bool is_add, View* parent, View* child) { } void View::VisibilityChanged(View* starting_from, bool is_visible) { } void View::NativeViewHierarchyChanged(bool attached, gfx::NativeView native_view, internal::RootView* root_view) { FocusManager* focus_manager = GetFocusManager(); if (!accelerator_registration_delayed_ && accelerator_focus_manager_ && accelerator_focus_manager_ != focus_manager) { UnregisterAccelerators(true); accelerator_registration_delayed_ = true; } if (accelerator_registration_delayed_ && attached) { if (focus_manager) { RegisterPendingAccelerators(); accelerator_registration_delayed_ = false; } } } // Painting -------------------------------------------------------------------- void View::PaintChildren(gfx::Canvas* canvas) { TRACE_EVENT0("views", "View::PaintChildren"); for (int i = 0, count = child_count(); i < count; ++i) if (!child_at(i)->layer()) child_at(i)->Paint(canvas); } void View::OnPaint(gfx::Canvas* canvas) { TRACE_EVENT0("views", "View::OnPaint"); OnPaintBackground(canvas); OnPaintFocusBorder(canvas); OnPaintBorder(canvas); } void View::OnPaintBackground(gfx::Canvas* canvas) { if (background_.get()) { TRACE_EVENT2("views", "View::OnPaintBackground", "width", canvas->GetSkCanvas()->getDevice()->width(), "height", canvas->GetSkCanvas()->getDevice()->height()); background_->Paint(canvas, this); } } void View::OnPaintBorder(gfx::Canvas* canvas) { if (border_.get()) { TRACE_EVENT2("views", "View::OnPaintBorder", "width", canvas->GetSkCanvas()->getDevice()->width(), "height", canvas->GetSkCanvas()->getDevice()->height()); border_->Paint(*this, canvas); } } void View::OnPaintFocusBorder(gfx::Canvas* canvas) { if (HasFocus() && (focusable() || IsAccessibilityFocusable())) { TRACE_EVENT2("views", "views::OnPaintFocusBorder", "width", canvas->GetSkCanvas()->getDevice()->width(), "height", canvas->GetSkCanvas()->getDevice()->height()); canvas->DrawFocusRect(GetLocalBounds()); } } // Accelerated Painting -------------------------------------------------------- void View::SetFillsBoundsOpaquely(bool fills_bounds_opaquely) { // This method should not have the side-effect of creating the layer. if (layer()) layer()->SetFillsBoundsOpaquely(fills_bounds_opaquely); } bool View::SetExternalTexture(ui::Texture* texture) { DCHECK(texture); SetPaintToLayer(true); layer()->SetExternalTexture(texture); // Child views must not paint into the external texture. So make sure each // child view has its own layer to paint into. for (Views::iterator i = children_.begin(); i != children_.end(); ++i) (*i)->SetPaintToLayer(true); SchedulePaintInRect(GetLocalBounds()); return true; } void View::CalculateOffsetToAncestorWithLayer(gfx::Point* offset, ui::Layer** layer_parent) { if (layer()) { if (layer_parent) *layer_parent = layer(); return; } if (!parent_) return; offset->Offset(x(), y()); parent_->CalculateOffsetToAncestorWithLayer(offset, layer_parent); } void View::MoveLayerToParent(ui::Layer* parent_layer, const gfx::Point& point) { gfx::Point local_point(point); if (parent_layer != layer()) local_point.Offset(x(), y()); if (layer() && parent_layer != layer()) { parent_layer->Add(layer()); layer()->SetBounds(gfx::Rect(local_point.x(), local_point.y(), width(), height())); } else { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->MoveLayerToParent(parent_layer, local_point); } } void View::UpdateLayerVisibility() { if (!use_acceleration_when_possible) return; 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 { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->UpdateChildLayerVisibility(ancestor_visible && visible_); } } void View::UpdateChildLayerBounds(const gfx::Point& offset) { if (layer()) { layer()->SetBounds(gfx::Rect(offset.x(), offset.y(), width(), height())); } else { for (int i = 0, count = child_count(); i < count; ++i) { gfx::Point new_offset(offset.x() + child_at(i)->x(), offset.y() + child_at(i)->y()); child_at(i)->UpdateChildLayerBounds(new_offset); } } } void View::OnPaintLayer(gfx::Canvas* canvas) { if (!layer() || !layer()->fills_bounds_opaquely()) canvas->GetSkCanvas()->drawColor(SK_ColorBLACK, SkXfermode::kClear_Mode); PaintCommon(canvas); } void View::ReorderLayers() { View* v = this; while (v && !v->layer()) v = v->parent(); // Forward to widget in case we're in a NativeWidgetAura. if (!v) { if (GetWidget()) GetWidget()->ReorderLayers(); } else { for (Views::const_iterator i(v->children_.begin()); i != v->children_.end(); ++i) (*i)->ReorderChildLayers(v->layer()); } } void View::ReorderChildLayers(ui::Layer* parent_layer) { if (layer()) { DCHECK_EQ(parent_layer, layer()->parent()); parent_layer->StackAtTop(layer()); } else { for (Views::const_iterator i(children_.begin()); i != children_.end(); ++i) (*i)->ReorderChildLayers(parent_layer); } } // Input ----------------------------------------------------------------------- bool View::HasHitTestMask() const { return false; } void View::GetHitTestMask(gfx::Path* mask) const { DCHECK(mask); } // 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. GetWidget()->NotifyAccessibilityEvent( this, ui::AccessibilityTypes::EVENT_FOCUS, true); } void View::OnBlur() { } void View::Focus() { SchedulePaint(); OnFocus(); } void View::Blur() { SchedulePaint(); OnBlur(); } // Tooltips -------------------------------------------------------------------- void View::TooltipTextChanged() { Widget* widget = GetWidget(); // TooltipManager may be null if there is a problem creating it. if (widget && widget->native_widget_private()->GetTooltipManager()) { widget->native_widget_private()->GetTooltipManager()-> TooltipTextChanged(this); } } // Context menus --------------------------------------------------------------- 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 --------------------------------------------------------------- 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() { Widget* widget = GetWidget(); return widget ? widget->dragged_view() == this : false; } // 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]; size_t baseNameIndex = GetClassName().find_last_of('/'); if (baseNameIndex == std::string::npos) baseNameIndex = 0; else baseNameIndex++; 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(GetClassName().substr(baseNameIndex).c_str()); base::snprintf(bounds_buffer, arraysize(bounds_buffer), "\\n bounds: (%d, %d), (%dx%d)", this->bounds().x(), this->bounds().y(), this->bounds().width(), this->bounds().height()); result.append(bounds_buffer); if (layer() && !layer()->hole_rect().IsEmpty()) { base::snprintf(bounds_buffer, arraysize(bounds_buffer), "\\n hole bounds: (%d, %d), (%dx%d)", layer()->hole_rect().x(), layer()->hole_rect().y(), layer()->hole_rect().width(), layer()->hole_rect().height()); result.append(bounds_buffer); } if (GetTransform().HasChange()) { gfx::Point translation; float rotation; gfx::Point3f scale; if (ui::InterpolatedTransform::FactorTRS(GetTransform(), &translation, &rotation, &scale)) { if (translation != gfx::Point(0, 0)) { base::snprintf(bounds_buffer, arraysize(bounds_buffer), "\\n translation: (%d, %d)", translation.x(), translation.y()); result.append(bounds_buffer); } if (fabs(rotation) > 1e-5) { base::snprintf(bounds_buffer, arraysize(bounds_buffer), "\\n rotation: %3.2f", rotation); result.append(bounds_buffer); } if (scale.AsPoint() != gfx::Point(0, 0)) { base::snprintf(bounds_buffer, arraysize(bounds_buffer), "\\n scale: (%2.4f, %2.4f)", scale.x(), scale.y()); result.append(bounds_buffer); } } } result.append("\""); if (!parent_) result.append(", shape=box"); if (layer()) { if (layer()->texture()) 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 (int i = 0, count = view_with_children->child_count(); i < count; ++i) result.append(view_with_children->child_at(i)->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::PaintCommon(gfx::Canvas* canvas) { if (!visible_ || !painting_enabled_) return; { // If the View we are about to paint requested the canvas to be flipped, we // should change the transform appropriately. // The canvas mirroring is undone once the View is done painting so that we // don't pass the canvas with the mirrored transform to Views that didn't // request the canvas to be flipped. ScopedCanvas scoped(canvas); if (FlipCanvasOnPaintForRTLUI()) { canvas->Translate(gfx::Point(width(), 0)); canvas->Scale(-1, 1); } OnPaint(canvas); } PaintChildren(canvas); } // Tree operations ------------------------------------------------------------- void View::DoRemoveChildView(View* view, bool update_focus_cycle, bool update_tool_tip, bool delete_removed_view) { DCHECK(view); const Views::iterator i(std::find(children_.begin(), children_.end(), view)); scoped_ptr view_to_be_deleted; if (i != children_.end()) { if (update_focus_cycle) { // Let's remove the view from the focus traversal. 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; } if (GetWidget()) UnregisterChildrenForVisibleBoundsNotification(view); view->PropagateRemoveNotifications(this); view->parent_ = NULL; view->UpdateLayerVisibility(); if (delete_removed_view && view->parent_owned()) view_to_be_deleted.reset(view); children_.erase(i); } if (update_tool_tip) UpdateTooltip(); if (layout_manager_.get()) layout_manager_->ViewRemoved(this, view); } void View::PropagateRemoveNotifications(View* parent) { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->PropagateRemoveNotifications(parent); for (View* v = this; v; v = v->parent_) v->ViewHierarchyChangedImpl(true, false, parent, this); } void View::PropagateAddNotifications(View* parent, View* child) { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->PropagateAddNotifications(parent, child); ViewHierarchyChangedImpl(true, true, parent, child); } void View::PropagateNativeViewHierarchyChanged(bool attached, gfx::NativeView native_view, internal::RootView* root_view) { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->PropagateNativeViewHierarchyChanged(attached, native_view, root_view); NativeViewHierarchyChanged(attached, native_view, root_view); } void View::ViewHierarchyChangedImpl(bool register_accelerators, bool is_add, View* parent, View* child) { if (register_accelerators) { if (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 { // Delay accelerator registration until visible as we do not have // focus manager until then. accelerator_registration_delayed_ = true; } } else { if (child == this) UnregisterAccelerators(true); } } if (is_add && layer() && !layer()->parent()) { UpdateParentLayer(); } else if (!is_add && child == this) { // Make sure the layers beloning to the subtree rooted at |child| get // removed from layers that do not belong in the same subtree. OrphanLayers(); } ViewHierarchyChanged(is_add, parent, child); parent->needs_layout_ = true; } // Size and disposition -------------------------------------------------------- void View::PropagateVisibilityNotifications(View* start, bool is_visible) { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->PropagateVisibilityNotifications(start, is_visible); VisibilityChangedImpl(start, is_visible); } void View::VisibilityChangedImpl(View* starting_from, bool is_visible) { VisibilityChanged(starting_from, is_visible); } 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 (use_acceleration_when_possible) { if (layer()) { if (parent_) { gfx::Point offset; parent_->CalculateOffsetToAncestorWithLayer(&offset, NULL); offset.Offset(x(), y()); layer()->SetBounds(gfx::Rect(offset, size())); } else { layer()->SetBounds(bounds_); } // TODO(beng): this seems redundant with the SchedulePaint at the top of // this function. explore collapsing. if (previous_bounds.size() != bounds_.size() && !layer()->layer_updated_externally()) { // If our bounds have changed then we need to update the complete // texture. layer()->SchedulePaint(GetLocalBounds()); } } else { // If our bounds have changed, then any descendant layer bounds may // have changed. Update them accordingly. gfx::Point offset; CalculateOffsetToAncestorWithLayer(&offset, NULL); UpdateChildLayerBounds(offset); } } OnBoundsChanged(previous_bounds); if (previous_bounds.size() != size()) { needs_layout_ = false; Layout(); } if (NeedsNotificationWhenVisibleBoundsChange()) 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->NeedsNotificationWhenVisibleBoundsChange()) view->RegisterForVisibleBoundsNotification(); for (int i = 0; i < view->child_count(); ++i) RegisterChildrenForVisibleBoundsNotification(view->child_at(i)); } // static void View::UnregisterChildrenForVisibleBoundsNotification(View* view) { if (view->NeedsNotificationWhenVisibleBoundsChange()) 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(); } // Transformations ------------------------------------------------------------- bool View::GetTransformRelativeTo(const View* ancestor, ui::Transform* transform) const { const View* p = this; while (p && p != ancestor) { transform->ConcatTransform(p->GetTransform()); transform->ConcatTranslate(static_cast(p->GetMirroredX()), static_cast(p->y())); p = p->parent_; } return p == ancestor; } // Coordinate conversion ------------------------------------------------------- bool View::ConvertPointForAncestor(const View* ancestor, gfx::Point* point) const { ui::Transform trans; // TODO(sad): Have some way of caching the transformation results. bool result = GetTransformRelativeTo(ancestor, &trans); gfx::Point3f p(*point); trans.TransformPoint(p); *point = p.AsPoint(); return result; } bool View::ConvertPointFromAncestor(const View* ancestor, gfx::Point* point) const { ui::Transform trans; bool result = GetTransformRelativeTo(ancestor, &trans); gfx::Point3f p(*point); trans.TransformPointReverse(p); *point = p.AsPoint(); return result; } // Accelerated painting -------------------------------------------------------- void View::CreateLayer() { // 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. for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->UpdateChildLayerVisibility(true); layer_.reset(new ui::Layer()); layer_->set_delegate(this); #if !defined(NDEBUG) layer_->set_name(GetClassName()); #endif 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(); } void View::UpdateParentLayers() { // Attach all top-level un-parented layers. if (layer() && !layer()->parent()) { UpdateParentLayer(); } else { for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->UpdateParentLayers(); } } void View::UpdateParentLayer() { if (!layer()) return; ui::Layer* parent_layer = NULL; gfx::Point offset(x(), y()); // TODO(sad): The NULL check here for parent_ essentially is to check if this // is the RootView. Instead of doing this, this function should be made // virtual and overridden from the RootView. if (parent_) parent_->CalculateOffsetToAncestorWithLayer(&offset, &parent_layer); else if (!parent_ && GetWidget()) GetWidget()->CalculateOffsetToAncestorWithLayer(&offset, &parent_layer); ReparentLayer(offset, parent_layer); } 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; } for (int i = 0, count = child_count(); i < count; ++i) child_at(i)->OrphanLayers(); } void View::ReparentLayer(const gfx::Point& offset, ui::Layer* parent_layer) { layer_->SetBounds(gfx::Rect(offset.x(), offset.y(), width(), height())); DCHECK_NE(layer(), parent_layer); if (parent_layer) parent_layer->Add(layer()); layer_->SchedulePaint(GetLocalBounds()); MoveLayerToParent(layer(), gfx::Point()); } void View::DestroyLayer() { ui::Layer* new_parent = layer()->parent(); std::vector children = layer()->children(); for (size_t i = 0; i < children.size(); ++i) { layer()->Remove(children[i]); if (new_parent) new_parent->Add(children[i]); } layer_.reset(); if (new_parent) ReorderLayers(); gfx::Point offset; CalculateOffsetToAncestorWithLayer(&offset, NULL); UpdateChildLayerBounds(offset); SchedulePaint(); } // Input ----------------------------------------------------------------------- bool View::ProcessMousePressed(const MouseEvent& event, DragInfo* drag_info) { int drag_operations = (enabled_ && event.IsOnlyLeftMouseButton() && HitTest(event.location())) ? GetDragOperations(event.location()) : 0; ContextMenuController* context_menu_controller = event.IsRightMouseButton() ? context_menu_controller_ : 0; const bool result = OnMousePressed(event); // WARNING: we may have been deleted, don't use any View variables. if (!enabled_) return result; if (drag_operations != ui::DragDropTypes::DRAG_NONE) { drag_info->PossibleDrag(event.location()); return true; } return !!context_menu_controller || result; } bool View::ProcessMouseDragged(const MouseEvent& event, DragInfo* drag_info) { // 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 = drag_info->possible_drag; if (possible_drag && ExceededDragThreshold( drag_info->start_pt.x() - event.x(), drag_info->start_pt.y() - event.y())) { if (!drag_controller_ || drag_controller_->CanStartDragForView( this, drag_info->start_pt, event.location())) DoDrag(event, drag_info->start_pt); } 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 MouseEvent& event) { if (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 (HitTest(location)) { ConvertPointToScreen(this, &location); ShowContextMenu(location, true); } } else { OnMouseReleased(event); } // WARNING: we may have been deleted. } ui::TouchStatus View::ProcessTouchEvent(const TouchEvent& event) { // TODO(rjkroege): Implement a grab scheme similar to as as is found in // MousePressed. return OnTouchEvent(event); } // 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. // TODO(jcampan): This fails for a view under NativeWidgetGtk with // TYPE_CHILD. (see http://crbug.com/21335) reenable // NOTREACHED assertion and verify accelerators works as // expected. #if defined(OS_WIN) NOTREACHED(); #endif return; } for (std::vector::const_iterator i( accelerators_->begin() + registered_accelerator_count_); i != accelerators_->end(); ++i) { accelerator_focus_manager_->RegisterAccelerator(*i, this); } registered_accelerator_count_ = accelerators_->size(); } void View::UnregisterAccelerators(bool leave_data_intact) { if (!accelerators_.get()) return; if (GetWidget()) { if (accelerator_focus_manager_) { // We may not have a FocusManager if the window containing us is being // closed, in which case the FocusManager is being deleted so there is // nothing to unregister. 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; for (Views::iterator i(children_.begin()); i != children_.end(); ++i) { if (!(*i)->next_focusable_view_) { last_focusable_view = *i; 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; } } } // System events --------------------------------------------------------------- void View::PropagateThemeChanged() { for (int i = child_count() - 1; i >= 0; --i) child_at(i)->PropagateThemeChanged(); OnThemeChanged(); } void View::PropagateLocaleChanged() { for (int i = child_count() - 1; i >= 0; --i) child_at(i)->PropagateLocaleChanged(); OnLocaleChanged(); } // Tooltips -------------------------------------------------------------------- void View::UpdateTooltip() { Widget* widget = GetWidget(); // TODO(beng): The TooltipManager NULL check can be removed when we // consolidate Init() methods and make views_unittests Init() all // Widgets that it uses. if (widget && widget->native_widget_private()->GetTooltipManager()) widget->native_widget_private()->GetTooltipManager()->UpdateTooltip(); } // Drag and drop --------------------------------------------------------------- void View::DoDrag(const MouseEvent& event, const gfx::Point& press_pt) { #if !defined(OS_MACOSX) int drag_operations = GetDragOperations(press_pt); if (drag_operations == ui::DragDropTypes::DRAG_NONE) return; OSExchangeData data; WriteDragData(press_pt, &data); // Message the RootView to do the drag and drop. That way if we're removed // the RootView can detect it and avoid calling us back. GetWidget()->RunShellDrag(this, data, drag_operations); #endif // !defined(OS_MACOSX) } } // namespace views