gecko-dev/view/public/nsIScrollableView.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
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*
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* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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*
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#ifndef nsIScrollableView_h___
#define nsIScrollableView_h___
#include "nsISupports.h"
#include "nsCoord.h"
#include "nsIViewManager.h"
class nsIView;
class nsIScrollPositionListener;
struct nsMargin;
typedef enum {
nsScrollPreference_kAuto = 0,
nsScrollPreference_kNeverScroll,
nsScrollPreference_kAlwaysScroll,
nsScrollPreference_kAlwaysScrollHorizontal,
nsScrollPreference_kAlwaysScrollVertical
} nsScrollPreference;
// the percentage of the page that is scrolled on a page up or down
#define PAGE_SCROLL_PERCENT 0.9
// IID for the nsIScrollableView interface
#define NS_ISCROLLABLEVIEW_IID \
{ 0xc95f1830, 0xc376, 0x11d1, \
{ 0xb7, 0x21, 0x0, 0x60, 0x8, 0x91, 0xd8, 0xc9 } }
/**
* A scrolling view allows an arbitrary view that you supply to be scrolled
* vertically or horizontally (or both). The scrolling view creates and
* manages the scrollbars.
*
* You must use SetScrolledView() to specify the view that is to be scrolled,
* because the scrolled view is made a child of the clip view (an internal
* child view created by the scrolling view).
*
*/
class nsIScrollableView : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISCROLLABLEVIEW_IID)
/**
* Create the controls used to allow scrolling. Call this method
* before anything else is done with the scrollable view.
* @param aNative native widget to use as parent for control widgets
* @return error status
*/
NS_IMETHOD CreateScrollControls(nsNativeWidget aNative = nsnull) = 0;
/**
* Compute the values for the scroll bars and adjust the position
* of the scrolled view as necessary.
* @param aAdjustWidgets if any widgets that are children of the
* scrolled view should be repositioned after rethinking
* the scroll parameters, set this ot PR_TRUE. in general
* this should be true unless you intended to vists the
* child widgets manually.
* @return error status
*/
NS_IMETHOD ComputeScrollOffsets(PRBool aAdjustWidgets = PR_TRUE) = 0;
/**
* Get the dimensions of the container
* @param aWidth return value for width of container
* @param aHeight return value for height of container
*/
NS_IMETHOD GetContainerSize(nscoord *aWidth, nscoord *aHeight) const = 0;
/**
* Set the view that we are scrolling within the scrolling view.
*/
NS_IMETHOD SetScrolledView(nsIView *aScrolledView) = 0;
/**
* Get the view that we are scrolling within the scrolling view.
* @result child view
*/
NS_IMETHOD GetScrolledView(nsIView *&aScrolledView) const = 0;
/**
* Select whether quality level should be displayed in view frame
* @param aShow if PR_TRUE, quality level will be displayed, else hidden
*/
NS_IMETHOD ShowQuality(PRBool aShow) = 0;
/**
* Query whether quality level should be displayed in view frame
* @return if PR_TRUE, quality level will be displayed, else hidden
*/
NS_IMETHOD GetShowQuality(PRBool &aShow) const = 0;
/**
* Select whether quality level should be displayed in view frame
* @param aShow if PR_TRUE, quality level will be displayed, else hidden
*/
NS_IMETHOD SetQuality(nsContentQuality aQuality) = 0;
/**
* Select whether scroll bars should be displayed all the time, never or
* only when necessary.
* @param aPref desired scrollbar selection
*/
NS_IMETHOD SetScrollPreference(nsScrollPreference aPref) = 0;
/**
* Query whether scroll bars should be displayed all the time, never or
* only when necessary.
* @return current scrollbar selection
*/
NS_IMETHOD GetScrollPreference(nsScrollPreference& aScrollPreference) const = 0;
/**
* Get the position of the scrolled view.
*/
NS_IMETHOD GetScrollPosition(nscoord &aX, nscoord& aY) const = 0;
/**
* Scroll the view to the given x,y, update's the scrollbar's thumb
* positions and the view's offset. Clamps the values to be
* legal. Updates the display based on aUpdateFlags.
* @param aX left edge to scroll to
* @param aY top edge to scroll to
* @param aUpdateFlags passed onto nsIViewManager->UpdateView()
* @return error status
*/
NS_IMETHOD ScrollTo(nscoord aX, nscoord aY, PRUint32 aUpdateFlags) = 0;
/**
* Set the amount to inset when positioning the scrollbars and clip view
*/
NS_IMETHOD SetControlInsets(const nsMargin &aInsets) = 0;
/**
* Get the amount to inset when positioning the scrollbars and clip view
*/
NS_IMETHOD GetControlInsets(nsMargin &aInsets) const = 0;
/**
* Get information about whether the vertical and horizontal scrollbars
* are currently visible
*/
NS_IMETHOD GetScrollbarVisibility(PRBool *aVerticalVisible,
PRBool *aHorizontalVisible) const = 0;
/**
* Set the properties describing how scrolling can be performed
* in this scrollable.
* @param aProperties new properties
* @return error status
*/
NS_IMETHOD SetScrollProperties(PRUint32 aProperties) = 0;
/**
* Get the properties describing how scrolling can be performed
* in this scrollable.
* @param aProperties out parameter for current properties
* @return error status
*/
NS_IMETHOD GetScrollProperties(PRUint32 *aProperties) = 0;
/**
* Set the height of a line used for line scrolling.
* @param aHeight new line height in app units. the default
* height is 12 points.
* @return error status
*/
NS_IMETHOD SetLineHeight(nscoord aHeight) = 0;
/**
* Get the height of a line used for line scrolling.
* @param aHeight out parameter for line height
* @return error status
*/
NS_IMETHOD GetLineHeight(nscoord *aHeight) = 0;
/**
* Scroll the view up or down by aNumLines lines. positive
* values move down in the view. Prevents scrolling off the
* end of the view.
* @param aNumLines number of lines to scroll the view by
* @return error status
*/
NS_IMETHOD ScrollByLines(PRInt32 aNumLinesX, PRInt32 aNumLinexY) = 0;
/**
* Scroll the view up or down by aNumPages pages. a page
* is considered to be the amount displayed by the clip view.
* positive values move down in the view. Prevents scrolling
* off the end of the view.
* @param aNumPage number of pages to scroll the view by
* @return error status
*/
NS_IMETHOD ScrollByPages(PRInt32 aNumPages) = 0;
/**
* Scroll the view to the top or bottom of the document depending
* on the value of aTop.
* @param aForward indicates whether to scroll to top or bottom
* @return error status
*/
NS_IMETHOD ScrollByWhole(PRBool aTop) = 0;
/**
* Returns the clip view
*/
NS_IMETHOD GetClipView(const nsIView** aClipView) const = 0;
/**
* Adds a scroll position listener.
*/
NS_IMETHOD AddScrollPositionListener(nsIScrollPositionListener* aListener) = 0;
/**
* Removes a scroll position listener.
*/
NS_IMETHOD RemoveScrollPositionListener(nsIScrollPositionListener* aListener) = 0;
};
//regardless of the transparency or opacity settings
//for this view, it can always be scrolled via a blit
#define NS_SCROLL_PROPERTY_ALWAYS_BLIT 0x0001
//regardless of the transparency or opacity settings
//for this view, it can never be scrolled via a blit
#define NS_SCROLL_PROPERTY_NEVER_BLIT 0x0002
#endif