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92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsIScrollbarMediator_h___
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#define nsIScrollbarMediator_h___
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#include "nsQueryFrame.h"
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#include "nsCoord.h"
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class nsScrollbarFrame;
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class nsIFrame;
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class nsIScrollbarMediator : public nsQueryFrame
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{
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public:
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NS_DECL_QUERYFRAME_TARGET(nsIScrollbarMediator)
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/**
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* The aScrollbar argument denotes the scrollbar that's firing the notification.
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* aScrollbar is never null.
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* aDirection is either -1, 0, or 1.
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*/
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/**
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* When set to ENABLE_SNAP, additional scrolling will be performed after the
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* scroll operation to maintain the constraints set by CSS Scroll snapping.
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* The additional scrolling may include asynchronous smooth scrolls that
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* continue to animate after the initial scroll position has been set.
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*/
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enum ScrollSnapMode { DISABLE_SNAP, ENABLE_SNAP };
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/**
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* One of the following three methods is called when the scrollbar's button is
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* clicked.
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* @note These methods might destroy the frame, pres shell, and other objects.
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*/
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virtual void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
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ScrollSnapMode aSnap = DISABLE_SNAP) = 0;
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virtual void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
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ScrollSnapMode aSnap = DISABLE_SNAP) = 0;
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virtual void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
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ScrollSnapMode aSnap = DISABLE_SNAP) = 0;
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/**
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* RepeatButtonScroll is called when the scrollbar's button is held down. When the
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* button is first clicked the increment is set; RepeatButtonScroll adds this
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* increment to the current position.
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* @note This method might destroy the frame, pres shell, and other objects.
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*/
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virtual void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) = 0;
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/**
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* aOldPos and aNewPos are scroll positions.
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* The scroll positions start with zero at the left edge; implementors that want
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* zero at the right edge for RTL content will need to adjust accordingly.
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* (See ScrollFrameHelper::ThumbMoved in nsGfxScrollFrame.cpp.)
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* @note This method might destroy the frame, pres shell, and other objects.
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*/
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virtual void ThumbMoved(nsScrollbarFrame* aScrollbar,
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nscoord aOldPos,
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nscoord aNewPos) = 0;
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/**
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* Called when the scroll bar thumb, slider, or any other component is
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* released.
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*/
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virtual void ScrollbarReleased(nsScrollbarFrame* aScrollbar) = 0;
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virtual void VisibilityChanged(bool aVisible) = 0;
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/**
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* Obtain the frame for the horizontal or vertical scrollbar, or null
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* if there is no such box.
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*/
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virtual nsIFrame* GetScrollbarBox(bool aVertical) = 0;
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/**
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* Show or hide scrollbars on 2 fingers touch.
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* Subclasses should call their ScrollbarActivity's corresponding methods.
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*/
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virtual void ScrollbarActivityStarted() const = 0;
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virtual void ScrollbarActivityStopped() const = 0;
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virtual bool IsScrollbarOnRight() const = 0;
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/**
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* Returns true if the mediator is asking the scrollbar to suppress
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* repainting itself on changes.
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*/
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virtual bool ShouldSuppressScrollbarRepaints() const = 0;
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};
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#endif
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