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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/wm/overview/transparent_activate_window_button.h"
#include <vector>
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/overview/transparent_activate_window_button_delegate.h"
#include "ui/events/event.h"
#include "ui/events/gesture_event_details.h"
#include "ui/gfx/display.h"
#include "ui/gfx/screen.h"
#include "ui/views/controls/button/button.h"
#include "ui/views/controls/button/custom_button.h"
#include "ui/views/widget/widget.h"
namespace ash {
namespace {
const char kTransparentButtonName[] = "TransparentButton";
// Transparent button that handles events to activate or close windows in
// overview mode.
class TransparentButton
: public views::CustomButton,
public views::ButtonListener {
public:
explicit TransparentButton(TransparentActivateWindowButtonDelegate* delegate);
~TransparentButton() override;
TransparentActivateWindowButtonDelegate* delegate() { return delegate_; }
// views::View:
void OnGestureEvent(ui::GestureEvent* event) override;
const char* GetClassName() const override { return kTransparentButtonName; }
// views::ButtonListener:
void ButtonPressed(views::Button* sender, const ui::Event& event) override;
private:
TransparentActivateWindowButtonDelegate* delegate_;
DISALLOW_COPY_AND_ASSIGN(TransparentButton);
};
TransparentButton::TransparentButton(
TransparentActivateWindowButtonDelegate* delegate)
: CustomButton(this),
delegate_(delegate) {
}
TransparentButton::~TransparentButton() {
}
void TransparentButton::OnGestureEvent(ui::GestureEvent* event) {
// TODO(tdanderson): Re-evaluate whether we want to set capture once
// the a fix has landed to avoid crashing when a window
// having an active gesture sequence is destroyed as a
// result of a gesture in a separate window. Consider using
// a StaticWindowTargeter instead of a transparent overlay
// widget to re-direct input events.
if (event->type() == ui::ET_GESTURE_TAP_DOWN)
GetWidget()->SetCapture(this);
if (event->type() == ui::ET_GESTURE_TAP ||
event->type() == ui::ET_GESTURE_END) {
GetWidget()->ReleaseCapture();
}
CustomButton::OnGestureEvent(event);
event->StopPropagation();
}
void TransparentButton::ButtonPressed(views::Button* sender,
const ui::Event& event) {
delegate_->Select();
}
// Initializes the event handler transparent window.
views::Widget* InitEventHandler(aura::Window* root_window) {
views::Widget* widget = new views::Widget;
views::Widget::InitParams params;
params.type = views::Widget::InitParams::TYPE_POPUP;
params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
params.accept_events = true;
params.parent = Shell::GetContainer(root_window,
kShellWindowId_OverlayContainer);
widget->set_focus_on_creation(false);
widget->Init(params);
widget->Show();
aura::Window* handler = widget->GetNativeWindow();
handler->parent()->StackChildAtBottom(handler);
return widget;
}
} // namespace
TransparentActivateWindowButton::TransparentActivateWindowButton(
aura::Window* root_window,
TransparentActivateWindowButtonDelegate* delegate)
: event_handler_widget_(InitEventHandler(root_window)),
transparent_button_(new TransparentButton(delegate)) {
event_handler_widget_->SetContentsView(transparent_button_);
}
TransparentActivateWindowButton::~TransparentActivateWindowButton() {
}
void TransparentActivateWindowButton::SetAccessibleName(
const base::string16& name) {
transparent_button_->SetAccessibleName(name);
}
void TransparentActivateWindowButton::SetBounds(const gfx::Rect& bounds) {
aura::Window* window = event_handler_widget_->GetNativeWindow();
const gfx::Display& display = gfx::Screen::GetScreenFor(
window)->GetDisplayNearestWindow(window);
// Explicitly specify the display so that the window doesn't change root
// windows and cause the z-order of the transparent overlays to be updated.
window->SetBoundsInScreen(bounds, display);
}
void TransparentActivateWindowButton::SendFocusAlert() const {
event_handler_widget_->GetContentsView()->
NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
}
} // namespace ash
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