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gecko-dev/view/public/nsIViewManager.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* 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
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* 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
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsIViewManager_h___
#define nsIViewManager_h___
#include "nscore.h"
#include "nsIView.h"
#include "nsColor.h"
#include "nsEvent.h"
class nsIScrollableView;
class nsIWidget;
class nsICompositeListener;
struct nsRect;
class nsRegion;
class nsIDeviceContext;
class nsIViewObserver;
enum nsRectVisibility {
nsRectVisibility_kVisible,
nsRectVisibility_kAboveViewport,
nsRectVisibility_kBelowViewport,
nsRectVisibility_kLeftOfViewport,
nsRectVisibility_kRightOfViewport,
nsRectVisibility_kZeroAreaRect
};
#define NS_IVIEWMANAGER_IID \
{ 0x3a8863d0, 0xa7f3, 0x11d1, \
{ 0xa8, 0x24, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
class nsIViewManager : public nsISupports
{
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IVIEWMANAGER_IID)
/**
* Initialize the ViewManager
* Note: this instance does not hold a reference to the viewobserver
* because it holds a reference to this instance.
* @result The result of the initialization, NS_OK if no errors
*/
NS_IMETHOD Init(nsIDeviceContext* aContext) = 0;
/**
* Get the root of the view tree.
* @result the root view
*/
NS_IMETHOD GetRootView(nsIView *&aView) = 0;
/**
* Set the root of the view tree. Does not destroy the current root view.
* At least one of following must be true:
* a) the aWidget parameter is an nsIWidget instance to render into
* that is not owned by any view and aView has no widget, or
* b) aView has a nsIWidget instance and aWidget is null, or
* c) aView has a parent view managed by a different view manager and
* aWidget is null
* @param aView view to set as root
* @param aWidget widget to render into. (Can not be owned by a view)
*/
NS_IMETHOD SetRootView(nsIView *aView, nsIWidget* aWidget = nsnull) = 0;
/**
* Get/Set the offset within the root widget (see above) at which to render.
* @param aX out parameter for offset X in window in twips
* @param aY out parameter for offset Y in window in twips
*/
NS_IMETHOD GetWindowOffset(nscoord *aX, nscoord *aY) = 0;
NS_IMETHOD SetWindowOffset(nscoord aX, nscoord aY) = 0;
/**
* Get the dimensions of the root window. The dimensions are in
* twips
* @param aWidth out parameter for width of window in twips
* @param aHeight out parameter for height of window in twips
*/
NS_IMETHOD GetWindowDimensions(nscoord *aWidth, nscoord *aHeight) = 0;
/**
* Set the dimensions of the root window.
* Called if the root window is resized. The dimensions are in
* twips
* @param aWidth of window in twips
* @param aHeight of window in twips
*/
NS_IMETHOD SetWindowDimensions(nscoord aWidth, nscoord aHeight) = 0;
/**
* Called to force a redrawing of any dirty areas.
*/
NS_IMETHOD Composite(void) = 0;
/**
* Called to inform the view manager that the entire area of a view
* is dirty and needs to be redrawn.
* @param aView view to paint. should be root view
* @param aUpdateFlags see bottom of nsIViewManager.h for description
*/
NS_IMETHOD UpdateView(nsIView *aView, PRUint32 aUpdateFlags) = 0;
/**
* Called to inform the view manager that some portion of a view
* is dirty and needs to be redrawn. The rect passed in
* should be in the view's coordinate space.
* @param aView view to paint. should be root view
* @param rect rect to mark as damaged
* @param aUpdateFlags see bottom of nsIViewManager.h for description
*/
NS_IMETHOD UpdateView(nsIView *aView, const nsRect &aRect, PRUint32 aUpdateFlags) = 0;
/**
* Called to inform the view manager that it should redraw all views.
* @param aView view to paint. should be root view
* @param aUpdateFlags see bottom of nsIViewManager.h for description
*/
NS_IMETHOD UpdateAllViews(PRUint32 aUpdateFlags) = 0;
/**
* Called to dispatch an event to the appropriate view. Often called
* as a result of receiving a mouse or keyboard event from the widget
* event system.
* @param event event to dispatch
* @result event handling status
*/
NS_IMETHOD DispatchEvent(nsGUIEvent *aEvent, nsEventStatus* aStatus) = 0;
/**
* Used to grab/capture all mouse events for a specific view,
* irrespective of the cursor position at which the
* event occurred.
* @param aView view to capture mouse events
* @result event handling status
*/
NS_IMETHOD GrabMouseEvents(nsIView *aView, PRBool& aResult) = 0;
/**
* Used to grab/capture all keyboard events for a specific view,
* irrespective of the cursor position at which the
* event occurred.
* @param aView view to capture keyboard events
* @result event handling status
*/
NS_IMETHOD GrabKeyEvents(nsIView *aView, PRBool& aResult) = 0;
/**
* Get the current view, if any, that's capturing mouse events.
* @result view that is capturing mouse events or nsnull
*/
NS_IMETHOD GetMouseEventGrabber(nsIView *&aView) = 0;
/**
* Get the current view, if any, that's capturing keyboard events.
* @result view that is capturing keyboard events or nsnull
*/
NS_IMETHOD GetKeyEventGrabber(nsIView *&aView) = 0;
/**
* Given a parent view, insert another view as its child.
* aSibling and aAbove control the "document order" for the insertion.
* If aSibling is null, the view is inserted at the end of the document order
* if aAfter is PR_TRUE, otherwise it is inserted at the beginning.
* If aSibling is non-null, then if aAfter is PR_TRUE, the view is inserted
* after the sibling in document order (appearing above the sibling unless
* overriden by z-order).
* If it is PR_FALSE, the view is inserted before the sibling.
* The view manager generates the appopriate dirty regions.
* @param aParent parent view
* @param aChild child view
* @param aSibling sibling view
* @param aAfter after or before in the document order
*/
NS_IMETHOD InsertChild(nsIView *aParent, nsIView *aChild, nsIView *aSibling,
PRBool aAfter) = 0;
/**
* Given a parent view, insert a placeholder for a view that logically
* belongs to this parent but has to be moved somewhere else for geometry
* reasons ("fixed" positioning).
* @param aParent parent view
* @param aChild child view
* @param aSibling sibling view
* @param aAfter after or before in the document order
*/
NS_IMETHOD InsertZPlaceholder(nsIView *aParent, nsIView *aChild, nsIView *aSibling,
PRBool aAfter) = 0;
/**
* Remove a specific child view from its parent. This will NOT remove its placeholder
* if there is one.
* The view manager generates the appropriate dirty regions.
* @param aParent parent view
* @param aChild child view
*/
NS_IMETHOD RemoveChild(nsIView *aChild) = 0;
/**
* Move a view to the specified position, provided in parent coordinates.
* The new position is the (0, 0) origin for the view's coordinate system.
* The view's bounds may extend above or to the left of this point.
* The view manager generates the appropriate dirty regions.
* @param aView view to move
* @param aX x value for new view position
* @param aY y value for new view position
*/
NS_IMETHOD MoveViewTo(nsIView *aView, nscoord aX, nscoord aY) = 0;
/**
* Resize a view. In addition to setting the width and height, you can
* set the x and y of its bounds relative to its position. Negative x and y
* will let the view extend above and to the left of the (0,0) point in its
* coordinate system.
* The view manager generates the appropriate dirty regions.
* @param aView view to move
* @param the new bounds relative to the current position
* @param RepaintExposedAreaOnly
* if PR_TRUE Repaint only the expanded or contracted region,
* if PR_FALSE Repaint the union of the old and new rectangles.
*/
NS_IMETHOD ResizeView(nsIView *aView, const nsRect &aRect,
PRBool aRepaintExposedAreaOnly = PR_FALSE) = 0;
/**
* Set the region to which a view's children are clipped.
* The view itself is not clipped to this region; this allows for effects where part of the view is
* drawn outside the clip region (e.g., its borders and background).
* The view manager generates the appropriate dirty regions.
* @param aView view to set clipping for
* @param aRegion
* if null then no clipping is required; everything the view paints is guaranteed
* to be inside its bounds, and all child views will also be inside this view's bounds.
* if non-null, then we will clip this view's child views to the region.
* The child views need not be within the bounds of this view, but the
* region must lie entirely inside this view's bounds. The view manager copies the region.
*
* XXX Currently we only support regions consisting of a single rectangle.
*/
NS_IMETHOD SetViewChildClipRegion(nsIView *aView, const nsRegion *aRegion) = 0;
/**
* Set the visibility of a view.
* The view manager generates the appropriate dirty regions.
* @param aView view to change visibility state of
* @param visible new visibility state
*/
NS_IMETHOD SetViewVisibility(nsIView *aView, nsViewVisibility aVisible) = 0;
/**
* Set the z-index of a view. Positive z-indices mean that a view
* is above its parent in z-order. Negative z-indices mean that a
* view is below its parent.
* The view manager generates the appropriate dirty regions.
* @param aAutoZIndex indicate that the z-index of a view is "auto". An "auto" z-index
* means that the view does not define a new stacking context,
* which means that the z-indicies of the view's children are
* relative to the view's siblings.
* @param aView view to change z depth of
* @param aZindex explicit z depth
* @param aTopMost used when this view is z-index:auto to compare against
* other z-index:auto views.
* PR_TRUE if the view should be topmost when compared with
* other z-index:auto views.
*/
NS_IMETHOD SetViewZIndex(nsIView *aView, PRBool aAutoZIndex, PRInt32 aZindex, PRBool aTopMost = PR_FALSE) = 0;
/**
* Set whether the view "floats" above all other views,
* which tells the compositor not to consider higher views in
* the view hierarchy that would geometrically intersect with
* this view. This is a hack, but it fixes some problems with
* views that need to be drawn in front of all other views.
*/
NS_IMETHOD SetViewFloating(nsIView *aView, PRBool aFloatingView) = 0;
/**
* Set whether the view can be bitblitted during scrolling.
*/
NS_IMETHOD SetViewBitBltEnabled(nsIView *aView, PRBool aEnable) = 0;
/**
* Set whether the view's children should be searched during event processing.
*/
NS_IMETHOD SetViewCheckChildEvents(nsIView *aView, PRBool aEnable) = 0;
/**
* Used set the transparency status of the content in a view. see
* nsIView.HasTransparency().
* @param aTransparent PR_TRUE if there are transparent areas, PR_FALSE otherwise.
*/
NS_IMETHOD SetViewContentTransparency(nsIView *aView, PRBool aTransparent) = 0;
/**
* Note: This didn't exist in 4.0. Called to set the opacity of a view.
* A value of 0.0 means completely transparent. A value of 1.0 means
* completely opaque.
* @param opacity new opacity value
*/
NS_IMETHOD SetViewOpacity(nsIView *aView, float aOpacity) = 0;
/**
* Set the view observer associated with this manager
* @param aObserver - new observer
* @result error status
*/
NS_IMETHOD SetViewObserver(nsIViewObserver *aObserver) = 0;
/**
* Get the view observer associated with this manager
* @param aObserver - out parameter for observer
* @result error status
*/
NS_IMETHOD GetViewObserver(nsIViewObserver *&aObserver) = 0;
/**
* Get the device context associated with this manager
* @result device context
*/
NS_IMETHOD GetDeviceContext(nsIDeviceContext *&aContext) = 0;
/**
* prevent the view manager from refreshing.
* @return error status
*/
NS_IMETHOD DisableRefresh(void) = 0;
/**
* allow the view manager to refresh. this may cause a synchronous
* paint to occur inside the call.
* @param aUpdateFlags see bottom of nsIViewManager.h for description
* @return error status
*/
NS_IMETHOD EnableRefresh(PRUint32 aUpdateFlags) = 0;
/**
* prevents the view manager from refreshing. allows UpdateView()
* to notify widgets of damaged regions that should be repainted
* when the batch is ended.
* @return error status
*/
NS_IMETHOD BeginUpdateViewBatch(void) = 0;
/**
* allow the view manager to refresh any damaged areas accumulated
* after the BeginUpdateViewBatch() call. this may cause a
* synchronous paint to occur inside the call if aUpdateFlags NS_VMREFRESH_IMMEDIATE is set
* @param aUpdateFlags see bottom of nsIViewManager.h for description
* @return error status
*/
NS_IMETHOD EndUpdateViewBatch(PRUint32 aUpdateFlags) = 0;
/**
* set the view that is is considered to be the root scrollable
* view for the document.
* @param aScrollable root scrollable view
* @return error status
*/
NS_IMETHOD SetRootScrollableView(nsIScrollableView *aScrollable) = 0;
/**
* get the view that is is considered to be the root scrollable
* view for the document.
* @param aScrollable out parameter for root scrollable view
* @return error status
*/
NS_IMETHOD GetRootScrollableView(nsIScrollableView **aScrollable) = 0;
/**
* Display the specified view. Used when printing.
*/
NS_IMETHOD Display(nsIView *aView, nscoord aX, nscoord aY, const nsRect& aClipRect) = 0;
/**
* Add a listener to the view manager's composite listener list.
* @param aListener - new listener
* @result error status
*/
NS_IMETHOD AddCompositeListener(nsICompositeListener *aListener) = 0;
/**
* Remove a listener from the view manager's composite listener list.
* @param aListener - listener to remove
* @result error status
*/
NS_IMETHOD RemoveCompositeListener(nsICompositeListener *aListener) = 0;
/**
* Retrieve the widget that a view renders into.
* The view must be in the view hierarchy.
* @param aView the view to get the widget for
* @param aWidget the widget that aView renders into.
* @result error status
*/
NS_IMETHOD GetWidgetForView(nsIView *aView, nsIWidget **aWidget) = 0;
/**
* Retrieve the widget that a view manager renders into
* @param aWidget the widget that aView renders into.
* @result error status
*/
NS_IMETHOD GetWidget(nsIWidget **aWidget) = 0;
/**
* Force update of view manager widget
* Callers should use UpdateView(view, NS_VMREFRESH_IMMEDIATE) in most cases instead
* @result error status
*/
NS_IMETHOD ForceUpdate() = 0;
/**
* Turn widget on or off widget movement caching
*/
NS_IMETHOD IsCachingWidgetChanges(PRBool* aCaching)=0;
/**
* Pass true to cache widget changes. pass false to stop. When false is passed
* All widget changes will be applied.
*/
NS_IMETHOD CacheWidgetChanges(PRBool aCache)=0;
/**
* Control double buffering of the display. If double buffering
* is enabled the viewmanager is allowed to render to an offscreen
* drawing surface before copying to the display in order to prevent
* flicker. If it is disabled all rendering will appear directly on the
* the display. The display is double buffered by default.
* @param aDoubleBuffer PR_TRUE to enable double buffering
* PR_FALSE to disable double buffering
*/
NS_IMETHOD AllowDoubleBuffering(PRBool aDoubleBuffer)=0;
/**
* Indicate whether the viewmanager is currently painting
*
* @param aPainting PR_TRUE if the viewmanager is painting
* PR_FALSE otherwise
*/
NS_IMETHOD IsPainting(PRBool& aIsPainting)=0;
/**
* Flush pending invalidates which have been queued up
* between DisableRefresh and EnableRefresh calls.
*/
NS_IMETHOD FlushPendingInvalidates()=0;
/**
* Set the default background color that the view manager should use
* to paint otherwise unowned areas. If the color isn't known, just set
* it to zero (which means 'transparent' since the color is RGBA).
*
* @param aColor the default background color
*/
NS_IMETHOD SetDefaultBackgroundColor(nscolor aColor)=0;
/**
* Retrieve the default background color.
*
* @param aColor the default background color
*/
NS_IMETHOD GetDefaultBackgroundColor(nscolor* aColor)=0;
/**
* Retrieve the time of the last user event. User events
* include mouse and keyboard events. The viewmanager
* saves the time of the last user event.
*
* @param aTime Last user event time in microseconds
*/
NS_IMETHOD GetLastUserEventTime(PRUint32& aTime)=0;
/**
* Determine if a rectangle specified in the view's coordinate system
* is completely, or partially visible.
* @param aView view that aRect coordinates are specified relative to
* @param aRect rectangle in twips to test for visibility
* @param aMinTwips is the min. pixel rows or cols at edge of screen
* needed for object to be counted visible
* @param aRectVisibility returns eVisible if the rect is visible,
* otherwise it returns an enum indicating why not
*/
NS_IMETHOD GetRectVisibility(nsIView *aView, const nsRect &aRect,
PRUint16 aMinTwips,
nsRectVisibility *aRectVisibility)=0;
};
//update view now?
#define NS_VMREFRESH_IMMEDIATE 0x0002
//prevent "sync painting"
#define NS_VMREFRESH_NO_SYNC 0x0004
//animate scroll operation
#define NS_VMREFRESH_SMOOTHSCROLL 0x0008
#endif // nsIViewManager_h___
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