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// 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/accessible_pane_view.h"
#include "base/message_loop/message_loop.h"
#include "ui/accessibility/ax_view_state.h"
#include "ui/views/focus/focus_search.h"
#include "ui/views/focus/view_storage.h"
#include "ui/views/widget/widget.h"
namespace views {
// Create tiny subclass of FocusSearch that overrides GetParent and Contains,
// delegating these to methods in AccessiblePaneView. This is needed so that
// subclasses of AccessiblePaneView can customize the focus search logic and
// include views that aren't part of the AccessiblePaneView's view
// hierarchy in the focus order.
class AccessiblePaneViewFocusSearch : public FocusSearch {
public:
explicit AccessiblePaneViewFocusSearch(AccessiblePaneView* pane_view)
: FocusSearch(pane_view, true, true),
accessible_pane_view_(pane_view) {}
protected:
virtual View* GetParent(View* v) OVERRIDE {
return accessible_pane_view_->ContainsForFocusSearch(root(), v) ?
accessible_pane_view_->GetParentForFocusSearch(v) : NULL;
}
// Returns true if |v| is contained within the hierarchy rooted at |root|.
// Subclasses can override this if they need custom focus search behavior.
virtual bool Contains(View* root, const View* v) OVERRIDE {
return accessible_pane_view_->ContainsForFocusSearch(root, v);
}
private:
AccessiblePaneView* accessible_pane_view_;
DISALLOW_COPY_AND_ASSIGN(AccessiblePaneViewFocusSearch);
};
AccessiblePaneView::AccessiblePaneView()
: pane_has_focus_(false),
allow_deactivate_on_esc_(false),
method_factory_(this),
focus_manager_(NULL),
home_key_(ui::VKEY_HOME, ui::EF_NONE),
end_key_(ui::VKEY_END, ui::EF_NONE),
escape_key_(ui::VKEY_ESCAPE, ui::EF_NONE),
left_key_(ui::VKEY_LEFT, ui::EF_NONE),
right_key_(ui::VKEY_RIGHT, ui::EF_NONE) {
focus_search_.reset(new AccessiblePaneViewFocusSearch(this));
last_focused_view_storage_id_ = ViewStorage::GetInstance()->CreateStorageID();
}
AccessiblePaneView::~AccessiblePaneView() {
if (pane_has_focus_) {
focus_manager_->RemoveFocusChangeListener(this);
}
}
bool AccessiblePaneView::SetPaneFocus(views::View* initial_focus) {
if (!visible())
return false;
if (!focus_manager_)
focus_manager_ = GetFocusManager();
View* focused_view = focus_manager_->GetFocusedView();
if (focused_view && !ContainsForFocusSearch(this, focused_view)) {
ViewStorage* view_storage = ViewStorage::GetInstance();
view_storage->RemoveView(last_focused_view_storage_id_);
view_storage->StoreView(last_focused_view_storage_id_, focused_view);
}
// Use the provided initial focus if it's visible and enabled, otherwise
// use the first focusable child.
if (!initial_focus ||
!ContainsForFocusSearch(this, initial_focus) ||
!initial_focus->visible() ||
!initial_focus->enabled()) {
initial_focus = GetFirstFocusableChild();
}
// Return false if there are no focusable children.
if (!initial_focus)
return false;
focus_manager_->SetFocusedView(initial_focus);
// If we already have pane focus, we're done.
if (pane_has_focus_)
return true;
// Otherwise, set accelerators and start listening for focus change events.
pane_has_focus_ = true;
ui::AcceleratorManager::HandlerPriority normal =
ui::AcceleratorManager::kNormalPriority;
focus_manager_->RegisterAccelerator(home_key_, normal, this);
focus_manager_->RegisterAccelerator(end_key_, normal, this);
focus_manager_->RegisterAccelerator(escape_key_, normal, this);
focus_manager_->RegisterAccelerator(left_key_, normal, this);
focus_manager_->RegisterAccelerator(right_key_, normal, this);
focus_manager_->AddFocusChangeListener(this);
return true;
}
bool AccessiblePaneView::SetPaneFocusAndFocusDefault() {
return SetPaneFocus(GetDefaultFocusableChild());
}
views::View* AccessiblePaneView::GetDefaultFocusableChild() {
return NULL;
}
View* AccessiblePaneView::GetParentForFocusSearch(View* v) {
return v->parent();
}
bool AccessiblePaneView::ContainsForFocusSearch(View* root, const View* v) {
return root->Contains(v);
}
void AccessiblePaneView::RemovePaneFocus() {
focus_manager_->RemoveFocusChangeListener(this);
pane_has_focus_ = false;
focus_manager_->UnregisterAccelerator(home_key_, this);
focus_manager_->UnregisterAccelerator(end_key_, this);
focus_manager_->UnregisterAccelerator(escape_key_, this);
focus_manager_->UnregisterAccelerator(left_key_, this);
focus_manager_->UnregisterAccelerator(right_key_, this);
}
views::View* AccessiblePaneView::GetFirstFocusableChild() {
FocusTraversable* dummy_focus_traversable;
views::View* dummy_focus_traversable_view;
return focus_search_->FindNextFocusableView(
NULL, false, views::FocusSearch::DOWN, false,
&dummy_focus_traversable, &dummy_focus_traversable_view);
}
views::View* AccessiblePaneView::GetLastFocusableChild() {
FocusTraversable* dummy_focus_traversable;
views::View* dummy_focus_traversable_view;
return focus_search_->FindNextFocusableView(
this, true, views::FocusSearch::DOWN, false,
&dummy_focus_traversable, &dummy_focus_traversable_view);
}
////////////////////////////////////////////////////////////////////////////////
// View overrides:
views::FocusTraversable* AccessiblePaneView::GetPaneFocusTraversable() {
if (pane_has_focus_)
return this;
else
return NULL;
}
bool AccessiblePaneView::AcceleratorPressed(
const ui::Accelerator& accelerator) {
views::View* focused_view = focus_manager_->GetFocusedView();
if (!ContainsForFocusSearch(this, focused_view))
return false;
switch (accelerator.key_code()) {
case ui::VKEY_ESCAPE: {
RemovePaneFocus();
View* last_focused_view = ViewStorage::GetInstance()->RetrieveView(
last_focused_view_storage_id_);
if (last_focused_view) {
focus_manager_->SetFocusedViewWithReason(
last_focused_view, FocusManager::kReasonFocusRestore);
} else if (allow_deactivate_on_esc_) {
focused_view->GetWidget()->Deactivate();
}
return true;
}
case ui::VKEY_LEFT:
focus_manager_->AdvanceFocus(true);
return true;
case ui::VKEY_RIGHT:
focus_manager_->AdvanceFocus(false);
return true;
case ui::VKEY_HOME:
focus_manager_->SetFocusedViewWithReason(
GetFirstFocusableChild(), views::FocusManager::kReasonFocusTraversal);
return true;
case ui::VKEY_END:
focus_manager_->SetFocusedViewWithReason(
GetLastFocusableChild(), views::FocusManager::kReasonFocusTraversal);
return true;
default:
return false;
}
}
void AccessiblePaneView::SetVisible(bool flag) {
if (visible() && !flag && pane_has_focus_) {
RemovePaneFocus();
focus_manager_->RestoreFocusedView();
}
View::SetVisible(flag);
}
void AccessiblePaneView::GetAccessibleState(ui::AXViewState* state) {
state->role = ui::AX_ROLE_PANE;
}
void AccessiblePaneView::RequestFocus() {
SetPaneFocusAndFocusDefault();
}
////////////////////////////////////////////////////////////////////////////////
// FocusChangeListener overrides:
void AccessiblePaneView::OnWillChangeFocus(views::View* focused_before,
views::View* focused_now) {
// Act when focus has changed.
}
void AccessiblePaneView::OnDidChangeFocus(views::View* focused_before,
views::View* focused_now) {
if (!focused_now)
return;
views::FocusManager::FocusChangeReason reason =
focus_manager_->focus_change_reason();
if (!ContainsForFocusSearch(this, focused_now) ||
reason == views::FocusManager::kReasonDirectFocusChange) {
// We should remove pane focus (i.e. make most of the controls
// not focusable again) because the focus has left the pane,
// or because the focus changed within the pane due to the user
// directly focusing to a specific view (e.g., clicking on it).
RemovePaneFocus();
}
}
////////////////////////////////////////////////////////////////////////////////
// FocusTraversable overrides:
views::FocusSearch* AccessiblePaneView::GetFocusSearch() {
DCHECK(pane_has_focus_);
return focus_search_.get();
}
views::FocusTraversable* AccessiblePaneView::GetFocusTraversableParent() {
DCHECK(pane_has_focus_);
return NULL;
}
views::View* AccessiblePaneView::GetFocusTraversableParentView() {
DCHECK(pane_has_focus_);
return NULL;
}
} // namespace views
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