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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 CHROME_BROWSER_UI_PANELS_PANEL_DRAG_CONTROLLER_H_
#define CHROME_BROWSER_UI_PANELS_PANEL_DRAG_CONTROLLER_H_
#include <set>
#include "base/basictypes.h"
#include "ui/gfx/point.h"
class Panel;
class PanelManager;
class PanelStrip;
namespace gfx {
class Rect;
}
// Responsible for handling drags initiated for all panels, including both
// intra-strip and inter-strip drags.
class PanelDragController {
public:
explicit PanelDragController(PanelManager* panel_manager);
~PanelDragController();
// Drags the given panel.
// |mouse_location| is in screen coordinate system.
void StartDragging(Panel* panel, const gfx::Point& mouse_location);
void Drag(const gfx::Point& mouse_location);
void EndDragging(bool cancelled);
// Asynchronous confirmation of panel having been closed.
void OnPanelClosed(Panel* panel);
bool IsDragging() const { return dragging_panel_ != NULL; }
Panel* dragging_panel() const { return dragging_panel_; }
#ifdef UNIT_TEST
static int GetDetachDockedPanelThreshold() {
return kDetachDockedPanelThreshold;
}
static int GetDockDetachedPanelThreshold() {
return kDockDetachedPanelThreshold;
}
#endif
private:
// Helper methods to figure out if the panel can be dragged to other strip.
// Returns target strip/boolean flag, and |new_panel_bounds| if the panel
// can enter other strip at |mouse_location|.
PanelStrip* ComputeDragTargetStrip(
const gfx::Point& mouse_location, gfx::Rect* new_panel_bounds) const;
bool CanDragToDockedStrip(
const gfx::Point& mouse_location, gfx::Rect* new_panel_bounds) const;
bool CanDragToDetachedStrip(
const gfx::Point& mouse_location, gfx::Rect* new_panel_bounds) const;
// The potential panel position is computed based on the fact that the panel
// should follow the mouse movement.
gfx::Point GetPanelPositionForMouseLocation(
const gfx::Point& mouse_location) const;
PanelManager* panel_manager_; // Weak, owns us.
// Panel currently being dragged.
Panel* dragging_panel_;
// The original panel strip when the drag is started.
PanelStrip* dragging_panel_original_strip_;
// The mouse location, in screen coordinates, when StartDragging or Drag was
// pveviously called.
gfx::Point last_mouse_location_;
// The offset from mouse location to the panel position when the drag
// starts.
gfx::Point offset_from_mouse_location_on_drag_start_;
// The minimum distance that the docked panel gets dragged up in order to
// make it free-floating.
static const int kDetachDockedPanelThreshold;
// Indicates how close the bottom of the detached panel is to the bottom of
// the docked area such that the detached panel becomes docked.
static const int kDockDetachedPanelThreshold;
DISALLOW_COPY_AND_ASSIGN(PanelDragController);
};
#endif // CHROME_BROWSER_UI_PANELS_PANEL_DRAG_CONTROLLER_H_
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