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// Copyright (c) 2010 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 VIEWS_CONTROLS_RESIZE_GRIPPER_H_
#define VIEWS_CONTROLS_RESIZE_GRIPPER_H_
#include <string>
#include "views/controls/image_view.h"
namespace views {
////////////////////////////////////////////////////////////////////////////////
//
// A simple resize gripper (two vertical bars).
//
////////////////////////////////////////////////////////////////////////////////
class ResizeGripper : public ImageView {
public:
//////////////////////////////////////////////////////////////////////////////
//
// The interface needed for getting notified about the resize event.
//
//////////////////////////////////////////////////////////////////////////////
class ResizeGripperDelegate {
public:
// OnResize is sent when resizing is detected. |resize_amount| specifies the
// number of pixels that the user wants to resize by, and can be negative or
// positive (depending on direction of dragging and flips according to
// locale directionality: dragging to the left in LTR locales gives negative
// |resize_amount| but positive amount for RTL). |done_resizing| is true if
// the user has released the mouse.
virtual void OnResize(int resize_amount, bool done_resizing) = 0;
};
explicit ResizeGripper(ResizeGripperDelegate* delegate);
virtual ~ResizeGripper();
// Overridden from views::View:
virtual std::string GetClassName() const;
virtual gfx::NativeCursor GetCursorForPoint(Event::EventType event_type,
const gfx::Point& p);
virtual bool OnMousePressed(const views::MouseEvent& event);
virtual bool OnMouseDragged(const views::MouseEvent& event);
virtual void OnMouseReleased(const views::MouseEvent& event, bool canceled);
virtual bool GetAccessibleRole(AccessibilityTypes::Role* role);
virtual bool GetAccessibleName(std::wstring* name);
virtual void SetAccessibleName(const std::wstring& name);
static const char kViewClassName[];
private:
// Report the amount the user resized by to the delegate, accounting for
// directionality.
void ReportResizeAmount(int resize_amount, bool last_update);
// The delegate to notify when we have updates.
ResizeGripperDelegate* delegate_;
// The mouse position at start (in screen coordinates).
int initial_position_;
// The storage string for the accessibility name associated with this control.
std::wstring accessible_name_;
DISALLOW_COPY_AND_ASSIGN(ResizeGripper);
};
} // namespace views
#endif // VIEWS_CONTROLS_RESIZE_GRIPPER_H_
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