gecko/layout/xul/nsIScrollbarMediator.h

66 lines
2.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsIScrollbarMediator_h___
#define nsIScrollbarMediator_h___
#include "nsQueryFrame.h"
#include "nsCoord.h"
class nsScrollbarFrame;
class nsIDOMEventTarget;
class nsIFrame;
class nsIScrollbarMediator : public nsQueryFrame
{
public:
NS_DECL_QUERYFRAME_TARGET(nsIScrollbarMediator)
/**
* The aScrollbar argument denotes the scrollbar that's firing the notification.
* aScrollbar is never null.
* aDirection is either -1, 0, or 1.
*/
/**
* One of the following three methods is called when the scrollbar's button is
* clicked.
* @note These methods might destroy the frame, pres shell, and other objects.
*/
virtual void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection) = 0;
virtual void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection) = 0;
virtual void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection) = 0;
/**
* RepeatButtonScroll is called when the scrollbar's button is held down. When the
* button is first clicked the increment is set; RepeatButtonScroll adds this
* increment to the current position.
* @note This method might destroy the frame, pres shell, and other objects.
*/
virtual void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) = 0;
/**
* aOldPos and aNewPos are scroll positions.
* @note This method might destroy the frame, pres shell, and other objects.
*/
virtual void ThumbMoved(nsScrollbarFrame* aScrollbar,
nscoord aOldPos,
nscoord aNewPos) = 0;
virtual void VisibilityChanged(bool aVisible) = 0;
/**
* Obtain the frame for the horizontal or vertical scrollbar, or null
* if there is no such box.
*/
virtual nsIFrame* GetScrollbarBox(bool aVertical) = 0;
/**
* Show or hide scrollbars on 2 fingers touch.
* Subclasses should call their ScrollbarActivity's corresponding methods.
*/
virtual void ScrollbarActivityStarted() const = 0;
virtual void ScrollbarActivityStopped() const = 0;
};
#endif