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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*
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* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
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* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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*
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#ifndef nsIScrollableView_h___
#define nsIScrollableView_h___
#include "nsCoord.h"
#include "nsIViewManager.h"
#include "nsIView.h"
class nsIView;
class nsIScrollPositionListener;
struct nsMargin;
struct nsSize;
// IID for the nsIScrollableView interface
#define NS_ISCROLLABLEVIEW_IID \
{ 0x36083bcf, 0x61d7, 0x4c24, \
{ 0xa6, 0xd4, 0x2f, 0x05, 0xba, 0x2c, 0x1b, 0x51 } }
/**
* 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:
NS_DECLARE_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;
/**
* 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;
/**
* 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 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 left or right by aNumLinesX columns. Positive values move right.
* Scroll the view up or down by aNumLinesY lines. Positive values move down.
* Prevents scrolling off the end of the view.
* @param aNumLinesX number of lines to scroll the view horizontally
* @param aNumLinesY number of lines to scroll the view vertically
* @return error status
*/
NS_IMETHOD ScrollByLines(PRInt32 aNumLinesX, PRInt32 aNumLinexY) = 0;
/**
* Get the desired size of a page scroll in each dimension.
* ScrollByPages will scroll by independent multiples of these amounts
* unless it hits the edge of the view.
*/
NS_IMETHOD GetPageScrollDistances(nsSize *aDistances) = 0;
/**
* Scroll the view left or right by aNumPagesX pages. Positive values move right.
* Scroll the view up or down by aNumPagesY pages. Positive values move down.
* A page is considered to be the amount displayed by the clip view.
* Prevents scrolling off the end of the view.
* @param aNumPagesX number of pages to scroll the view horizontally
* @param aNumPagesY number of pages to scroll the view vertically
* @return error status
*/
NS_IMETHOD ScrollByPages(PRInt32 aNumPagesX, PRInt32 aNumPagesY) = 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;
/**
* Check the view can scroll from current offset.
* @param aHorizontal If checking to Left or to Right, true. Otherwise, false.
* @param aForward If checking to Right or Bottom, true. Otherwise, false.
* @param aResult If the view can scroll, true. Otherwise, false.
* @return error status
*/
NS_IMETHOD CanScroll(PRBool aHorizontal, PRBool aForward, PRBool &aResult) = 0;
/**
* Returns the view as an nsIView*
*/
NS_IMETHOD_(nsIView*) View() = 0;
/**
* Adds a scroll position listener.
*/
NS_IMETHOD AddScrollPositionListener(nsIScrollPositionListener* aListener) = 0;
/**
* Removes a scroll position listener.
*/
NS_IMETHOD RemoveScrollPositionListener(nsIScrollPositionListener* aListener) = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIScrollableView, NS_ISCROLLABLEVIEW_IID)
//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