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https://gitlab.winehq.org/wine/wine-gecko.git
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216 lines
8.3 KiB
C++
216 lines
8.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* interface that provides scroll APIs implemented by scrollable frames
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*/
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#ifndef nsIScrollFrame_h___
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#define nsIScrollFrame_h___
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#include "nsISupports.h"
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#include "nsCoord.h"
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#include "nsPresContext.h"
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#include "nsIFrame.h" // to get nsIBox, which is a typedef
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class nsBoxLayoutState;
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class nsIScrollPositionListener;
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/**
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* Interface for frames that are scrollable. This interface exposes
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* APIs for examining scroll state, observing changes to scroll state,
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* and triggering scrolling.
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*/
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class nsIScrollableFrame : public nsQueryFrame {
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public:
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NS_DECL_QUERYFRAME_TARGET(nsIScrollableFrame)
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/**
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* Get the frame for the content that we are scrolling within
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* this scrollable frame.
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*/
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virtual nsIFrame* GetScrolledFrame() const = 0;
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typedef nsPresContext::ScrollbarStyles ScrollbarStyles;
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/**
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* Get the styles (NS_STYLE_OVERFLOW_SCROLL, NS_STYLE_OVERFLOW_HIDDEN,
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* or NS_STYLE_OVERFLOW_AUTO) governing the horizontal and vertical
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* scrollbars for this frame.
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*/
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virtual ScrollbarStyles GetScrollbarStyles() const = 0;
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enum { HORIZONTAL = 0x01, VERTICAL = 0x02 };
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/**
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* Return the scrollbars which are visible. It's OK to call this during reflow
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* of the scrolled contents, in which case it will reflect the current
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* assumptions about scrollbar visibility.
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*/
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virtual PRUint32 GetScrollbarVisibility() const = 0;
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/**
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* Return the actual sizes of all possible scrollbars. Returns 0 for scrollbar
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* positions that don't have a scrollbar or where the scrollbar is not visible.
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* Do not call this while this frame's descendants are being reflowed, it won't be
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* accurate.
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*/
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virtual nsMargin GetActualScrollbarSizes() const = 0;
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/**
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* Return the sizes of all scrollbars assuming that any scrollbars that could
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* be visible due to overflowing content, are. This can be called during reflow
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* of the scrolled contents.
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*/
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virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState) = 0;
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/**
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* Return the sizes of all scrollbars assuming that any scrollbars that could
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* be visible due to overflowing content, are. This can be called during reflow
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* of the scrolled contents.
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*/
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virtual nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
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nsRenderingContext* aRC) = 0;
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/**
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* Get the area of the scrollport relative to the origin of this frame's
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* border-box.
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* This is the area of this frame minus border and scrollbars.
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*/
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virtual nsRect GetScrollPortRect() const = 0;
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/**
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* Get the offset of the scrollport origin relative to the scrolled
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* frame origin. Typically the position will be non-negative.
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* This will always be a multiple of device pixels.
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*/
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virtual nsPoint GetScrollPosition() const = 0;
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/**
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* Get the area that must contain the scroll position. Typically
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* (but not always, e.g. for RTL content) x and y will be 0, and
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* width or height will be nonzero if the content can be scrolled in
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* that direction. Since scroll positions must be a multiple of
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* device pixels, the range extrema will also be a multiple of
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* device pixels.
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*/
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virtual nsRect GetScrollRange() const = 0;
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/**
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* Return how much we would try to scroll by in each direction if
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* asked to scroll by one "line" vertically and horizontally.
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*/
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virtual nsSize GetLineScrollAmount() const = 0;
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/**
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* Return how much we would try to scroll by in each direction if
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* asked to scroll by one "page" vertically and horizontally.
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*/
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virtual nsSize GetPageScrollAmount() const = 0;
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/**
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* When a scroll operation is requested, we ask for instant, smooth or normal
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* scrolling. SMOOTH will only be smooth if smooth scrolling is actually
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* enabled. INSTANT is always synchronous, NORMAL can be asynchronous.
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* If an INSTANT request happens while a smooth or async scroll is already in
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* progress, the async scroll is interrupted and we instantly scroll to the
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* destination.
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*/
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enum ScrollMode { INSTANT, SMOOTH, NORMAL };
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/**
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* Clamps aScrollPosition to GetScrollRange and sets the scroll position
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* to that value.
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*/
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virtual void ScrollTo(nsPoint aScrollPosition, ScrollMode aMode) = 0;
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/**
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* When scrolling by a relative amount, we can choose various units.
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*/
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enum ScrollUnit { DEVICE_PIXELS, LINES, PAGES, WHOLE };
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/**
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* Modifies the current scroll position by aDelta units given by aUnit,
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* clamping it to GetScrollRange. If WHOLE is specified as the unit,
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* content is scrolled all the way in the direction(s) given by aDelta.
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* @param aOverflow if non-null, returns the amount that scrolling
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* was clamped by in each direction (how far we moved the scroll position
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* to bring it back into the legal range). This is never negative. The
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* values are in device pixels.
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*/
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virtual void ScrollBy(nsIntPoint aDelta, ScrollUnit aUnit, ScrollMode aMode,
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nsIntPoint* aOverflow = nsnull) = 0;
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/**
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* This tells the scroll frame to try scrolling to the scroll
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* position that was restored from the history. This must be called
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* at least once after state has been restored. It is called by the
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* scrolled frame itself during reflow, but sometimes state can be
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* restored after reflows are done...
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* XXX should we take an aMode parameter here? Currently it's instant.
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*/
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virtual void ScrollToRestoredPosition() = 0;
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/**
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* Add a scroll position listener. This listener must be removed
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* before it is destroyed.
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*/
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virtual void AddScrollPositionListener(nsIScrollPositionListener* aListener) = 0;
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/**
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* Remove a scroll position listener.
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*/
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virtual void RemoveScrollPositionListener(nsIScrollPositionListener* aListener) = 0;
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/**
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* Obtain the XUL box for the horizontal or vertical scrollbar, or null
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* if there is no such box. Avoid using this, but may be useful for
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* setting up a scrollbar mediator if you want to redirect scrollbar
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* input.
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*/
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virtual nsIBox* GetScrollbarBox(bool aVertical) = 0;
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/**
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* Internal method used by scrollbars to notify their scrolling
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* container of changes.
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*/
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virtual void CurPosAttributeChanged(nsIContent* aChild) = 0;
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/**
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* Allows the docshell to request that the scroll frame post an event
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* after being restored from history.
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*/
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NS_IMETHOD PostScrolledAreaEventForCurrentArea() = 0;
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/**
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* Returns true if this scrollframe is being "actively scrolled".
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* This basically means that we should allocate resources in the
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* expectation that scrolling is going to happen.
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*/
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virtual bool IsScrollingActive() = 0;
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};
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#endif
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