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// Copyright (c) 2013 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 UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_H_
#define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_H_
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "ui/events/platform/platform_event_dispatcher.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/gfx/vector2d_f.h"
#include "ui/views/widget/desktop_aura/x11_whole_screen_move_loop_delegate.h"
typedef struct _XDisplay XDisplay;
namespace aura {
class Window;
}
namespace ui {
class ScopedEventDispatcher;
}
namespace views {
class Widget;
// Runs a nested message loop and grabs the mouse. This is used to implement
// dragging.
class X11WholeScreenMoveLoop : public ui::PlatformEventDispatcher {
public:
explicit X11WholeScreenMoveLoop(X11WholeScreenMoveLoopDelegate* delegate);
virtual ~X11WholeScreenMoveLoop();
// ui:::PlatformEventDispatcher:
virtual bool CanDispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
virtual uint32_t DispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
// Runs the nested message loop. While the mouse is grabbed, use |cursor| as
// the mouse cursor. Returns true if the move-loop is completed successfully.
// If the pointer-grab fails, or the move-loop is canceled by the user (e.g.
// by pressing escape), then returns false.
bool RunMoveLoop(aura::Window* window, gfx::NativeCursor cursor);
// Updates the cursor while the move loop is running.
void UpdateCursor(gfx::NativeCursor cursor);
// Ends the RunMoveLoop() that's currently in progress.
void EndMoveLoop();
// Sets an image to be used during the drag.
void SetDragImage(const gfx::ImageSkia& image, gfx::Vector2dF offset);
private:
// Grabs the pointer and keyboard, setting the mouse cursor to |cursor|.
// Returns true if the grab was successful.
bool GrabPointerAndKeyboard(gfx::NativeCursor cursor);
// Creates an input-only window to be used during the drag.
Window CreateDragInputWindow(XDisplay* display);
// Creates a window to show the drag image during the drag.
void CreateDragImageWindow();
// Checks to see if |in_image| is an image that has any visible regions
// (defined as having a pixel with alpha > 32). If so, return true.
bool CheckIfIconValid();
// Dispatch mouse movement event to |delegate_| in a posted task.
void DispatchMouseMovement();
X11WholeScreenMoveLoopDelegate* delegate_;
// Are we running a nested message loop from RunMoveLoop()?
bool in_move_loop_;
scoped_ptr<ui::ScopedEventDispatcher> nested_dispatcher_;
bool should_reset_mouse_flags_;
// An invisible InputOnly window . We create this window so we can track the
// cursor wherever it goes on screen during a drag, since normal windows
// don't receive pointer motion events outside of their bounds.
::Window grab_input_window_;
base::Closure quit_closure_;
// Keeps track of whether the move-loop is cancled by the user (e.g. by
// pressing escape).
bool canceled_;
// Keeps track of whether we still have a pointer grab at the end of the loop.
bool has_grab_;
// A Widget is created during the drag if there is an image available to be
// used during the drag.
scoped_ptr<Widget> drag_widget_;
gfx::ImageSkia drag_image_;
gfx::Vector2dF drag_offset_;
XMotionEvent last_xmotion_;
base::WeakPtrFactory<X11WholeScreenMoveLoop> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(X11WholeScreenMoveLoop);
};
} // namespace views
#endif // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_H_