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view.cc
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// Copyright (c) 2010 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 "views/view.h"
#include <algorithm>
#ifndef NDEBUG
#include <iostream>
#endif
#include "app/drag_drop_types.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/scoped_handle.h"
#include "base/utf_string_conversions.h"
#include "gfx/canvas_skia.h"
#include "gfx/path.h"
#include "third_party/skia/include/core/SkShader.h"
#include "views/background.h"
#include "views/layout_manager.h"
#include "views/views_delegate.h"
#include "views/widget/root_view.h"
#include "views/widget/tooltip_manager.h"
#include "views/widget/widget.h"
#include "views/window/window.h"
#if defined(OS_WIN)
#include "views/accessibility/view_accessibility.h"
#endif
#if defined(OS_LINUX)
#include "app/scoped_handle_gtk.h"
#endif
namespace views {
// static
ViewsDelegate* ViewsDelegate::views_delegate = NULL;
// static
char View::kViewClassName[] = "views/View";
// static
const int View::kShowFolderDropMenuDelay = 400;
/////////////////////////////////////////////////////////////////////////////
//
// View - constructors, destructors, initialization
//
/////////////////////////////////////////////////////////////////////////////
View::View()
: id_(0),
group_(-1),
enabled_(true),
focusable_(false),
accessibility_focusable_(false),
bounds_(0, 0, 0, 0),
needs_layout_(true),
parent_(NULL),
is_visible_(true),
is_parent_owned_(true),
notify_when_visible_bounds_in_root_changes_(false),
registered_for_visible_bounds_notification_(false),
accelerator_registration_delayed_(false),
next_focusable_view_(NULL),
previous_focusable_view_(NULL),
accelerator_focus_manager_(NULL),
registered_accelerator_count_(0),
context_menu_controller_(NULL),
drag_controller_(NULL),
flip_canvas_on_paint_for_rtl_ui_(false) {
}
View::~View() {
if (parent_)
parent_->RemoveChildView(this);
int c = static_cast<int>(child_views_.size());
while (--c >= 0) {
child_views_[c]->SetParent(NULL);
if (child_views_[c]->IsParentOwned())
delete child_views_[c];
}
#if defined(OS_WIN)
if (view_accessibility_.get())
view_accessibility_->set_view(NULL);
#endif
}
/////////////////////////////////////////////////////////////////////////////
//
// View - sizing
//
/////////////////////////////////////////////////////////////////////////////
gfx::Rect View::GetBounds(PositionMirroringSettings settings) const {
gfx::Rect bounds(bounds_);
// If the parent uses an RTL UI layout and if we are asked to transform the
// bounds to their mirrored position if necessary, then we should shift the
// rectangle appropriately.
if (settings == APPLY_MIRRORING_TRANSFORMATION)
bounds.set_x(MirroredX());
return bounds;
}
// y(), width() and height() are agnostic to the RTL UI layout of the
// parent view. x(), on the other hand, is not.
int View::GetX(PositionMirroringSettings settings) const {
return settings == IGNORE_MIRRORING_TRANSFORMATION ? x() : MirroredX();
}
void View::SetBounds(const gfx::Rect& bounds) {
if (bounds == bounds_) {
if (needs_layout_) {
needs_layout_ = false;
Layout();
}
return;
}
gfx::Rect prev = bounds_;
bounds_ = bounds;
bool size_changed = prev.size() != bounds_.size();
bool position_changed = prev.origin() != bounds_.origin();
if (size_changed || position_changed) {
DidChangeBounds(prev, bounds_);
RootView* root = GetRootView();
if (root)
root->ViewBoundsChanged(this, size_changed, position_changed);
}
}
gfx::Rect View::GetLocalBounds(bool include_border) const {
if (include_border || !border_.get())
return gfx::Rect(0, 0, width(), height());
gfx::Insets insets;
border_->GetInsets(&insets);
return gfx::Rect(insets.left(), insets.top(),
std::max(0, width() - insets.width()),
std::max(0, height() - insets.height()));
}
gfx::Point View::GetPosition() const {
return gfx::Point(GetX(APPLY_MIRRORING_TRANSFORMATION), y());
}
gfx::Size View::GetPreferredSize() {
if (layout_manager_.get())
return layout_manager_->GetPreferredSize(this);
return gfx::Size();
}
int View::GetBaseline() {
return -1;
}
void View::SizeToPreferredSize() {
gfx::Size prefsize = GetPreferredSize();
if ((prefsize.width() != width()) || (prefsize.height() != height()))
SetBounds(x(), y(), prefsize.width(), prefsize.height());
}
void View::PreferredSizeChanged() {
InvalidateLayout();
if (parent_)
parent_->ChildPreferredSizeChanged(this);
}
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::DidChangeBounds(const gfx::Rect& previous,
const gfx::Rect& current) {
needs_layout_ = false;
Layout();
}
void View::ScrollRectToVisible(const gfx::Rect& rect) {
View* parent = GetParent();
// 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(GetX(APPLY_MIRRORING_TRANSFORMATION), y());
parent->ScrollRectToVisible(scroll_rect);
}
}
/////////////////////////////////////////////////////////////////////////////
//
// View - 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);
SchedulePaint();
}
// 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 = GetChildViewCount(); i < count; ++i) {
View* child = GetChildViewAt(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);
}
////////////////////////////////////////////////////////////////////////////////
//
// View - Right-to-left UI layout
//
////////////////////////////////////////////////////////////////////////////////
int View::MirroredX() const {
View* parent = GetParent();
return parent ? parent->MirroredLeftPointForRect(bounds_) : x();
}
int View::MirroredLeftPointForRect(const gfx::Rect& bounds) const {
return base::i18n::IsRTL() ?
(width() - bounds.x() - bounds.width()) : bounds.x();
}
////////////////////////////////////////////////////////////////////////////////
//
// View - states
//
////////////////////////////////////////////////////////////////////////////////
bool View::IsEnabled() const {
return enabled_;
}
void View::SetEnabled(bool state) {
if (enabled_ != state) {
enabled_ = state;
SchedulePaint();
}
}
void View::SetFocusable(bool focusable) {
focusable_ = focusable;
}
bool View::IsFocusableInRootView() const {
return IsFocusable() && IsVisibleInRootView();
}
bool View::IsAccessibilityFocusableInRootView() const {
return (focusable_ || accessibility_focusable_) && IsEnabled() &&
IsVisibleInRootView();
}
FocusManager* View::GetFocusManager() {
Widget* widget = GetWidget();
return widget ? widget->GetFocusManager() : NULL;
}
bool View::HasFocus() {
FocusManager* focus_manager = GetFocusManager();
if (focus_manager)
return focus_manager->GetFocusedView() == this;
return false;
}
void View::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();
// Notify assistive technologies of the focus change.
NotifyAccessibilityEvent(AccessibilityTypes::EVENT_FOCUS);
}
void View::NotifyAccessibilityEvent(AccessibilityTypes::Event event_type) {
NotifyAccessibilityEvent(event_type, true);
}
void View::SetHotTracked(bool flag) {
}
/////////////////////////////////////////////////////////////////////////////
//
// View - painting
//
/////////////////////////////////////////////////////////////////////////////
void View::SchedulePaint(const gfx::Rect& r, bool urgent) {
if (!IsVisible())
return;
if (parent_) {
// Translate the requested paint rect to the parent's coordinate system
// then pass this notification up to the parent.
gfx::Rect paint_rect = r;
paint_rect.Offset(GetPosition());
parent_->SchedulePaint(paint_rect, urgent);
}
}
void View::SchedulePaint() {
SchedulePaint(GetLocalBounds(true), false);
}
void View::Paint(gfx::Canvas* canvas) {
PaintBackground(canvas);
PaintFocusBorder(canvas);
PaintBorder(canvas);
}
void View::PaintBackground(gfx::Canvas* canvas) {
if (background_.get())
background_->Paint(canvas, this);
}
void View::PaintBorder(gfx::Canvas* canvas) {
if (border_.get())
border_->Paint(*this, canvas);
}
void View::PaintFocusBorder(gfx::Canvas* canvas) {
if (HasFocus() && (IsFocusable() || IsAccessibilityFocusableInRootView()))
canvas->DrawFocusRect(0, 0, width(), height());
}
void View::PaintChildren(gfx::Canvas* canvas) {
for (int i = 0, count = GetChildViewCount(); i < count; ++i) {
View* child = GetChildViewAt(i);
if (!child) {
NOTREACHED() << "Should not have a NULL child View for index in bounds";
continue;
}
child->ProcessPaint(canvas);
}
}
void View::ProcessPaint(gfx::Canvas* canvas) {
if (!IsVisible())
return;
// We're going to modify the canvas, save it's state first.
canvas->Save();
// 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.
if (canvas->ClipRectInt(MirroredX(), y(), width(), height())) {
// Non-empty clip, translate the graphics such that 0,0 corresponds to
// where this view is located (related to its parent).
canvas->TranslateInt(MirroredX(), y());
// If the View we are about to paint requested the canvas to be flipped, we
// should change the transform appropriately.
canvas->Save();
if (FlipCanvasOnPaintForRTLUI()) {
canvas->TranslateInt(width(), 0);
canvas->ScaleInt(-1, 1);
}
Paint(canvas);
// We must undo the canvas mirroring 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.
canvas->Restore();
PaintChildren(canvas);
}
// Restore the canvas's original transform.
canvas->Restore();
}
void View::PaintNow() {
if (!IsVisible())
return;
View* view = GetParent();
if (view)
view->PaintNow();
}
gfx::Insets View::GetInsets() const {
gfx::Insets insets;
if (border_.get())
border_->GetInsets(&insets);
return insets;
}
gfx::NativeCursor View::GetCursorForPoint(Event::EventType event_type,
const gfx::Point& p) {
return NULL;
}
bool View::HitTest(const gfx::Point& l) const {
if (l.x() >= 0 && l.x() < width() && l.y() >= 0 && l.y() < height()) {
if (HasHitTestMask()) {
gfx::Path mask;
GetHitTestMask(&mask);
ScopedRegion rgn(mask.CreateNativeRegion());
// TODO: can this use SkRegion's contains instead?
#if defined(OS_WIN)
return !!PtInRegion(rgn, l.x(), l.y());
#elif defined(TOOLKIT_USES_GTK)
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;
}
void View::SetContextMenuController(ContextMenuController* menu_controller) {
context_menu_controller_ = menu_controller;
}
void View::ShowContextMenu(const gfx::Point& p, bool is_mouse_gesture) {
if (!context_menu_controller_)
return;
context_menu_controller_->ShowContextMenu(this, p, is_mouse_gesture);
}
/////////////////////////////////////////////////////////////////////////////
//
// View - tree
//
/////////////////////////////////////////////////////////////////////////////
bool View::ProcessMousePressed(const MouseEvent& e, DragInfo* drag_info) {
const bool enabled = IsEnabled();
int drag_operations =
(enabled && e.IsOnlyLeftMouseButton() && HitTest(e.location())) ?
GetDragOperations(e.location()) : 0;
ContextMenuController* context_menu_controller = e.IsRightMouseButton() ?
context_menu_controller_ : 0;
const bool result = OnMousePressed(e);
// WARNING: we may have been deleted, don't use any View variables;
if (!enabled)
return result;
if (drag_operations != DragDropTypes::DRAG_NONE) {
drag_info->PossibleDrag(e.location());
return true;
}
return !!context_menu_controller || result;
}
bool View::ProcessMouseDragged(const MouseEvent& e, 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() - e.x(),
drag_info->start_pt.y() - e.y())) {
if (!drag_controller_ ||
drag_controller_->CanStartDrag(this, drag_info->start_pt, e.location()))
DoDrag(e, drag_info->start_pt);
} else {
if (OnMouseDragged(e))
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& e, bool canceled) {
if (!canceled && context_menu_controller_ && e.IsOnlyRightMouseButton()) {
// Assume that if there is a context menu controller we won't be deleted
// from mouse released.
gfx::Point location(e.location());
OnMouseReleased(e, canceled);
if (HitTest(location)) {
ConvertPointToScreen(this, &location);
ShowContextMenu(location, true);
}
} else {
OnMouseReleased(e, canceled);
}
// WARNING: we may have been deleted.
}
#if defined(TOUCH_UI)
bool View::ProcessTouchEvent(const TouchEvent& e) {
// TODO(rjkroege): Implement a grab scheme similar to as
// as is found in MousePressed.
const bool result = OnTouchEvent(e);
return result;
}
#endif
void View::AddChildView(View* v) {
AddChildView(static_cast<int>(child_views_.size()), v);
}
void View::AddChildView(int index, View* v) {
CHECK(v != this) << "You cannot add a view as its own child";
// Remove the view from its current parent if any.
if (v->GetParent())
v->GetParent()->RemoveChildView(v);
// Sets the prev/next focus views.
InitFocusSiblings(v, index);
// Let's insert the view.
child_views_.insert(child_views_.begin() + index, v);
v->SetParent(this);
for (View* p = this; p; p = p->GetParent())
p->ViewHierarchyChangedImpl(false, true, this, v);
v->PropagateAddNotifications(this, v);
UpdateTooltip();
RootView* root = GetRootView();
if (root)
RegisterChildrenForVisibleBoundsNotification(root, v);
if (layout_manager_.get())
layout_manager_->ViewAdded(this, v);
}
View* View::GetChildViewAt(int index) const {
return index < GetChildViewCount() ? child_views_[index] : NULL;
}
int View::GetChildViewCount() const {
return static_cast<int>(child_views_.size());
}
bool View::HasChildView(View* a_view) {
return find(child_views_.begin(),
child_views_.end(),
a_view) != child_views_.end();
}
void View::RemoveChildView(View* a_view) {
DoRemoveChildView(a_view, true, true, false);
}
void View::RemoveAllChildViews(bool delete_views) {
ViewList::iterator iter;
while ((iter = child_views_.begin()) != child_views_.end()) {
DoRemoveChildView(*iter, false, false, delete_views);
}
UpdateTooltip();
}
void View::DoDrag(const MouseEvent& e, const gfx::Point& press_pt) {
int drag_operations = GetDragOperations(press_pt);
if (drag_operations == 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.
RootView* root_view = GetRootView();
root_view->StartDragForViewFromMouseEvent(this, data, drag_operations);
}
void View::DoRemoveChildView(View* a_view,
bool update_focus_cycle,
bool update_tool_tip,
bool delete_removed_view) {
#ifndef NDEBUG
DCHECK(!IsProcessingPaint()) << "Should not be removing a child view " <<
"during a paint, this will seriously " <<
"mess things up!";
#endif
DCHECK(a_view);
const ViewList::iterator i = find(child_views_.begin(),
child_views_.end(),
a_view);
if (i != child_views_.end()) {
if (update_focus_cycle) {
// Let's remove the view from the focus traversal.
View* next_focusable = a_view->next_focusable_view_;
View* prev_focusable = a_view->previous_focusable_view_;
if (prev_focusable)
prev_focusable->next_focusable_view_ = next_focusable;
if (next_focusable)
next_focusable->previous_focusable_view_ = prev_focusable;
}
RootView* root = GetRootView();
if (root)
UnregisterChildrenForVisibleBoundsNotification(root, a_view);
a_view->PropagateRemoveNotifications(this);
a_view->SetParent(NULL);
if (delete_removed_view && a_view->IsParentOwned())
delete a_view;
child_views_.erase(i);
}
if (update_tool_tip)
UpdateTooltip();
if (layout_manager_.get())
layout_manager_->ViewRemoved(this, a_view);
}
void View::PropagateRemoveNotifications(View* parent) {
for (int i = 0, count = GetChildViewCount(); i < count; ++i)
GetChildViewAt(i)->PropagateRemoveNotifications(parent);
for (View* v = this; v; v = v->GetParent())
v->ViewHierarchyChangedImpl(true, false, parent, this);
}
void View::PropagateAddNotifications(View* parent, View* child) {
for (int i = 0, count = GetChildViewCount(); i < count; ++i)
GetChildViewAt(i)->PropagateAddNotifications(parent, child);
ViewHierarchyChangedImpl(true, true, parent, child);
}
bool View::IsFocusable() const {
return focusable_ && IsEnabled() && IsVisible();
}
void View::PropagateThemeChanged() {
for (int i = GetChildViewCount() - 1; i >= 0; --i)
GetChildViewAt(i)->PropagateThemeChanged();
OnThemeChanged();
}
void View::PropagateLocaleChanged() {
for (int i = GetChildViewCount() - 1; i >= 0; --i)
GetChildViewAt(i)->PropagateLocaleChanged();
OnLocaleChanged();
}
#ifndef NDEBUG
bool View::IsProcessingPaint() const {
return GetParent() && GetParent()->IsProcessingPaint();
}
#endif
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;
}
bool View::HasHitTestMask() const {
return false;
}
void View::GetHitTestMask(gfx::Path* mask) const {
DCHECK(mask);
}
void View::ViewHierarchyChanged(bool is_add,
View* parent,
View* child) {
}
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);
}
}
ViewHierarchyChanged(is_add, parent, child);
parent->needs_layout_ = true;
}
void View::PropagateVisibilityNotifications(View* start, bool is_visible) {
for (int i = 0, count = GetChildViewCount(); i < count; ++i)
GetChildViewAt(i)->PropagateVisibilityNotifications(start, is_visible);
VisibilityChanged(start, is_visible);
}
void View::VisibilityChanged(View* starting_from, bool is_visible) {
}
void View::PropagateNativeViewHierarchyChanged(bool attached,
gfx::NativeView native_view,
RootView* root_view) {
for (int i = 0, count = GetChildViewCount(); i < count; ++i)
GetChildViewAt(i)->PropagateNativeViewHierarchyChanged(attached,
native_view,
root_view);
NativeViewHierarchyChanged(attached, native_view, root_view);
}
void View::NativeViewHierarchyChanged(bool attached,
gfx::NativeView native_view,
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;
}
}
}
void View::SetNotifyWhenVisibleBoundsInRootChanges(bool value) {
if (notify_when_visible_bounds_in_root_changes_ == value)
return;
notify_when_visible_bounds_in_root_changes_ = value;
RootView* root = GetRootView();
if (root) {
if (value)
root->RegisterViewForVisibleBoundsNotification(this);
else
root->UnregisterViewForVisibleBoundsNotification(this);
}
}
bool View::GetNotifyWhenVisibleBoundsInRootChanges() {
return notify_when_visible_bounds_in_root_changes_;
}
View* View::GetViewForPoint(const gfx::Point& point) {
// Walk the child Views recursively looking for the View that most
// tightly encloses the specified point.
for (int i = GetChildViewCount() - 1; i >= 0; --i) {
View* child = GetChildViewAt(i);
if (!child->IsVisible())
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->GetViewForPoint(point_in_child_coords);
}
return this;
}
Widget* View::GetWidget() const {
// The root view holds a reference to this view hierarchy's Widget.
return parent_ ? parent_->GetWidget() : NULL;
}
Window* View::GetWindow() const {
Widget* widget = GetWidget();
return widget ? widget->GetWindow() : NULL;
}
bool View::ContainsNativeView(gfx::NativeView native_view) const {
for (int i = 0, count = GetChildViewCount(); i < count; ++i) {
if (GetChildViewAt(i)->ContainsNativeView(native_view))
return true;
}
return false;
}
// Get the containing RootView
RootView* View::GetRootView() {
Widget* widget = GetWidget();
return widget ? widget->GetRootView() : NULL;
}
View* View::GetViewByID(int id) const {
if (id == id_)
return const_cast<View*>(this);
for (int i = 0, count = GetChildViewCount(); i < count; ++i) {
View* child = GetChildViewAt(i);
View* view = child->GetViewByID(id);
if (view)
return view;
}
return NULL;
}
void View::GetViewsWithGroup(int group_id, std::vector<View*>* out) {
if (group_ == group_id)
out->push_back(this);
for (int i = 0, count = GetChildViewCount(); i < count; ++i)
GetChildViewAt(i)->GetViewsWithGroup(group_id, out);
}
View* View::GetSelectedViewForGroup(int group_id) {
std::vector<View*> views;
GetRootView()->GetViewsWithGroup(group_id, &views);
if (views.size() > 0)
return views[0];
else
return NULL;
}
void View::SetID(int id) {
id_ = id;
}
int View::GetID() const {
return 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_;
}
void View::SetParent(View* parent) {
if (parent != parent_)
parent_ = parent;
}
bool View::IsParentOf(View* v) const {
DCHECK(v);
View* parent = v->GetParent();
while (parent) {
if (this == parent)
return true;
parent = parent->GetParent();
}
return false;
}
int View::GetChildIndex(const View* v) const {
for (int i = 0, count = GetChildViewCount(); i < count; i++) {
if (v == GetChildViewAt(i))
return i;
}
return -1;
}
///////////////////////////////////////////////////////////////////////////////
//
// View - focus
//
///////////////////////////////////////////////////////////////////////////////
View* View::GetNextFocusableView() {
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;
}
void View::InitFocusSiblings(View* v, int index) {
int child_count = static_cast<int>(child_views_.size());
if (child_count == 0) {
v->next_focusable_view_ = NULL;
v->previous_focusable_view_ = NULL;
} else {
if (index == child_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 (std::vector<View*>::iterator iter = child_views_.begin();
iter != child_views_.end(); ++iter) {
if (!(*iter)->next_focusable_view_) {
last_focusable_view = *iter;
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 = child_views_[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 = child_views_[index]->GetPreviousFocusableView();
v->previous_focusable_view_ = prev;
v->next_focusable_view_ = child_views_[index];
if (prev)
prev->next_focusable_view_ = v;
child_views_[index]->previous_focusable_view_ = v;
}
}
}
#ifndef NDEBUG
void View::PrintViewHierarchy() {
PrintViewHierarchyImp(0);
}
void View::PrintViewHierarchyImp(int indent) {
std::wostringstream buf;
int ind = indent;
while (ind-- > 0)
buf << L' ';
buf << UTF8ToWide(GetClassName());
buf << L' ';
buf << GetID();
buf << L' ';
buf << bounds_.x() << L"," << bounds_.y() << L",";
buf << bounds_.right() << L"," << bounds_.bottom();
buf << L' ';
buf << this;
VLOG(1) << buf.str();
std::cout << buf.str() << std::endl;
for (int i = 0, count = GetChildViewCount(); i < count; ++i)
GetChildViewAt(i)->PrintViewHierarchyImp(indent + 2);
}