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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_GTK_H_
#define CHROME_BROWSER_UI_PANELS_PANEL_DRAG_GTK_H_
#pragma once
#include <gtk/gtk.h>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "ui/base/gtk/gtk_signal.h"
class Panel;
class PanelDragDelegate;
// Class for GTK handling of move-drag and resize-drag on a panel.
// Only one type of drag may be active at any time.
// Dragging only begins if the mouse is moved beyond the drag threshold.
// If mouse is released without exceeding the drag threshold, the mouse
// press and release is treated as a mouse click.
class PanelDragGtk {
public:
explicit PanelDragGtk(Panel* panel);
~PanelDragGtk();
GtkWidget* widget() const { return drag_widget_; }
// Sets up mouse and keyboard events processing while the mouse
// is pressed on a window edge.
// |event| is the mouse press event.
// |cursor| is the cursor to display during the drag.
// |edge| is the window edge from which to resize the panel.
void InitialWindowEdgeMousePress(GdkEventButton* event, GdkCursor* cursor,
GdkWindowEdge& edge);
// Sets up mouse and keyboard events processing while the mouse is
// pressed on the titlebar.
// |event| is the mouse press event.
// |titlebar_widget| should handle the mouse release event if the mouse
// is released without exceeding the drag threshold (a mouse click).
void InitialTitlebarMousePress(GdkEventButton* event,
GtkWidget* titlebar_widget);
private:
friend class NativePanelTestingGtk;
enum DragState {
NOT_DRAGGING,
DRAG_CAN_START, // mouse pressed
DRAG_IN_PROGRESS, // mouse moved beyond drag threshold
DRAG_ENDED_WAITING_FOR_MOUSE_RELEASE
};
// Callbacks for GTK mouse and key events.
CHROMEGTK_CALLBACK_1(PanelDragGtk, gboolean, OnMouseMoveEvent,
GdkEventMotion*);
CHROMEGTK_CALLBACK_1(PanelDragGtk, gboolean, OnButtonPressEvent,
GdkEventButton*);
CHROMEGTK_CALLBACK_1(PanelDragGtk, gboolean, OnButtonReleaseEvent,
GdkEventButton*);
CHROMEGTK_CALLBACK_1(PanelDragGtk, gboolean, OnKeyPressEvent,
GdkEventKey*);
CHROMEGTK_CALLBACK_1(PanelDragGtk, gboolean, OnKeyReleaseEvent,
GdkEventKey*);
CHROMEGTK_CALLBACK_1(PanelDragGtk, gboolean, OnGrabBrokenEvent,
GdkEventGrabBroken*);
// Utility to dcheck a bunch of state to ensure a clean slate.
// Returns only if all the dchecks pass.
void AssertCleanState();
void GrabPointerAndKeyboard(GdkEventButton* event,
GdkCursor* cursor);
void ReleasePointerAndKeyboardGrab();
// Ends any drag that is currently in progress (if any).
// Resets all drag state except for pointer and keyboard grabs.
// The grabs are released when the mouse is released to prevent a
// mouse release *after* the drag has ended (e.g. via ESC key) from
// being treated as a mouse click.
void EndDrag(bool canceled);
// Weak pointer to the panel being dragged.
Panel* panel_;
// Invisible event box to receive mouse and key events.
GtkWidget* drag_widget_;
DragState drag_state_;
// A copy of the initial button press event.
GdkEvent* initial_mouse_down_;
// Widget that should process the mouse click if mouse is released
// without exceeding the drag threshold. May be NULL if no click
// handling is necessary.
GtkWidget* click_handler_;
// Delegate for processing drag depends on actual type of drag.
PanelDragDelegate* drag_delegate_;
DISALLOW_COPY_AND_ASSIGN(PanelDragGtk);
};
#endif // CHROME_BROWSER_UI_PANELS_PANEL_DRAG_GTK_H_
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