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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.
#ifndef ASH_DISPLAY_MOUSE_CURSOR_EVENT_FILTER_H
#define ASH_DISPLAY_MOUSE_CURSOR_EVENT_FILTER_H
#include "ash/ash_export.h"
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/rect.h"
namespace aura {
class RootWindow;
class Window;
}
namespace ash {
class DisplayController;
namespace internal {
class SharedDisplayEdgeIndicator;
// An event filter that controls mouse location in extended desktop
// environment.
class ASH_EXPORT MouseCursorEventFilter : public ui::EventHandler {
public:
enum MouseWarpMode {
WARP_ALWAYS, // Always warp the mouse when possible.
WARP_DRAG, // Used when dragging a window. Top and bottom
// corner of the shared edge is reserved for window
// snapping.
WARP_NONE, // No mouse warping. Used when resizing the window.
};
MouseCursorEventFilter();
virtual ~MouseCursorEventFilter();
void set_mouse_warp_mode(MouseWarpMode mouse_warp_mode) {
mouse_warp_mode_ = mouse_warp_mode;
}
// Shows/Hide the indicator for window dragging. The |from|
// is the window where the dragging started.
void ShowSharedEdgeIndicator(const aura::Window* from);
void HideSharedEdgeIndicator();
// Overridden from ui::EventHandler:
virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
private:
friend class DragWindowResizerTest;
friend class MouseCursorEventFilterTest;
FRIEND_TEST_ALL_PREFIXES(MouseCursorEventFilterTest, DoNotWarpTwice);
FRIEND_TEST_ALL_PREFIXES(MouseCursorEventFilterTest, SetMouseWarpModeFlag);
FRIEND_TEST_ALL_PREFIXES(MouseCursorEventFilterTest,
IndicatorBoundsTestOnRight);
FRIEND_TEST_ALL_PREFIXES(MouseCursorEventFilterTest,
IndicatorBoundsTestOnLeft);
FRIEND_TEST_ALL_PREFIXES(MouseCursorEventFilterTest,
IndicatorBoundsTestOnTopBottom);
FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, WarpMousePointer);
void reset_was_mouse_warped_for_test() { was_mouse_warped_ = false; }
// Warps the mouse cursor to an alternate root window when the
// |point_in_screen|, which is the location of the mouse cursor,
// hits or exceeds the edge of the |target_root| and the mouse cursor
// is considered to be in an alternate display. Returns true if
// the cursor was moved.
bool WarpMouseCursorIfNecessary(aura::Window* target_root,
const gfx::Point& point_in_screen);
void UpdateHorizontalIndicatorWindowBounds();
void UpdateVerticalIndicatorWindowBounds();
MouseWarpMode mouse_warp_mode_;
// This flag is used to suppress the accidental mouse warp back to the
// original display.
bool was_mouse_warped_;
// The bounds for warp hole windows. |dst_indicator_bounds_| is kept
// in the instance for testing.
gfx::Rect src_indicator_bounds_;
gfx::Rect dst_indicator_bounds_;
// The root window in which the dragging started.
const aura::Window* drag_source_root_;
float scale_when_drag_started_;
// Shows the area where a window can be dragged in to/out from
// another display.
scoped_ptr<SharedDisplayEdgeIndicator> shared_display_edge_indicator_;
DISALLOW_COPY_AND_ASSIGN(MouseCursorEventFilter);
};
} // namespace internal
} // namespace ash
#endif // ASH_DISPLAY_MOUSE_CURSOR_EVENT_FILTER_H
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