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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.
#ifndef ASH_UTILITY_PARTIAL_SCREENSHOT_CONTROLLER_H_
#define ASH_UTILITY_PARTIAL_SCREENSHOT_CONTROLLER_H_
#include <map>
#include "ash/ash_export.h"
#include "ash/shell_observer.h"
#include "base/memory/scoped_ptr.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/display_observer.h"
#include "ui/gfx/geometry/point.h"
namespace aura {
class Window;
}
namespace ui {
class LocatedEvent;
}
namespace ash {
class ScreenshotDelegate;
// This class controls a session of taking partial screenshot, i.e.: drawing
// region rectangles during drag, and changing the mouse cursor to indicate
// the current mode.
// This class does not use aura::Window / views::Widget intentionally to avoid
// the conflicts of window manager features like mouse captures or window focus.
class ASH_EXPORT PartialScreenshotController : public ui::EventHandler,
public gfx::DisplayObserver {
public:
PartialScreenshotController();
~PartialScreenshotController() override;
// Starts the UI for taking partial screenshot; dragging to select a region.
// PartialScreenshotController manage their own lifetime so caller must not
// delete the returned values.
void StartPartialScreenshotSession(ScreenshotDelegate* screenshot_delegate);
private:
friend class PartialScreenshotControllerTest;
class ScopedCursorSetter;
class PartialScreenshotLayer;
// Starts, ends, cancels, or updates the region selection.
void MaybeStart(const ui::LocatedEvent& event);
void Complete();
void Cancel();
void Update(const ui::LocatedEvent& event);
// ui::EventHandler:
void OnKeyEvent(ui::KeyEvent* event) override;
void OnMouseEvent(ui::MouseEvent* event) override;
void OnTouchEvent(ui::TouchEvent* event) override;
// gfx::DisplayObserver:
void OnDisplayAdded(const gfx::Display& new_display) override;
void OnDisplayRemoved(const gfx::Display& old_display) override;
void OnDisplayMetricsChanged(const gfx::Display& display,
uint32_t changed_metrics) override;
// The data to build the screenshot region.
gfx::Point start_position_;
aura::Window* root_window_;
// Layers to create the visual effect of region selection.
std::map<aura::Window*, PartialScreenshotLayer*> layers_;
// The object to specify the crosshair cursor.
scoped_ptr<ScopedCursorSetter> cursor_setter_;
// ScreenshotDelegate to take the actual screenshot. No ownership.
ScreenshotDelegate* screenshot_delegate_;
DISALLOW_COPY_AND_ASSIGN(PartialScreenshotController);
};
} // namespace ash
#endif // #ifndef ASH_WM_PARTIAL_SCREENSHOT_VIEW_H_
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