зеркало из https://github.com/mozilla/gecko-dev.git
482 строки
16 KiB
C++
482 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsIView_h___
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#define nsIView_h___
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#include <stdio.h>
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#include "nsISupports.h"
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#include "nsCoord.h"
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#include "nsIWidget.h"
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#include "nsGUIEvent.h"
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class nsIViewManager;
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class nsIRegion;
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class nsIRenderingContext;
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class nsTransform2D;
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class nsIFrame;
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class nsIViewObserver;
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class nsVoidArray;
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struct nsRect;
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//this is used by the view clipping APIs since the description of
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//a clip rect is different than a rect
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typedef struct
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{
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nscoord mLeft;
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nscoord mRight;
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nscoord mTop;
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nscoord mBottom;
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} nsViewClip;
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// Enumerated type to indicate the visibility of a layer.
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// hide - the layer is not shown.
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// show - the layer is shown irrespective of the visibility of
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// the layer's parent.
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// inherit - the layer inherits its visibility from its parent.
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typedef enum
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{
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nsViewVisibility_kHide = 0,
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nsViewVisibility_kShow = 1,
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nsViewVisibility_kInherit = 2
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} nsViewVisibility;
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// IID for the nsIView interface
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#define NS_IVIEW_IID \
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{ 0xf0a21c40, 0xa7e1, 0x11d1, \
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{ 0xa8, 0x24, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
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//----------------------------------------------------------------------
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/**
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* View interface
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*
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* Views are NOT reference counted. Use the Destroy() member function to
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* destroy a frame.
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*
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* The lifetime of the view hierarchy is bounded by the lifetime of the
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* view manager that owns the views.
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*/
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class nsIView : public nsISupports
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{
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public:
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/**
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* Initialize the view
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* @param aManager view manager that "owns" the view. The view does NOT
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* hold a reference to the view manager
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* @param aBounds initial bounds for view
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* @param aParent intended parent for view. this is not actually set in the
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* nsIView through this method. it is only used by the initialization
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* code to walk up the view tree, if necessary, to find resources.
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* @param aCilpRect initial clip rect of view
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* @param aVisibilityFlag initial visibility state of view
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* @result The result of the initialization, NS_OK if no errors
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*/
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NS_IMETHOD Init(nsIViewManager* aManager,
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const nsRect &aBounds,
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const nsIView *aParent,
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const nsViewClip *aClip = nsnull,
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nsViewVisibility aVisibilityFlag = nsViewVisibility_kShow) = 0;
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/**
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* Destroy the view.
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*
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* The view destroys its child views, and destroys and releases its
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* widget (if it has one).
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*
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* Also informs the view manager that the view is destroyed by calling
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* SetRootView(NULL) if the view is the root view and calling RemoveChild()
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* otherwise.
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*/
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NS_IMETHOD Destroy() = 0;
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/**
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* Get the view manager the "owns" the view
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* @result view manager
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*/
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NS_IMETHOD GetViewManager(nsIViewManager *&aViewMgr) = 0;
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/**
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* Called to indicate that the specified rect of the view
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* needs to be drawn via the rendering context. The rect
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* is specified in view coordinates.
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* @param rc rendering context to paint into
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* @param rect damage area
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* @param aPaintFlags see nsIView.h for flag definitions
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* @return PR_TRUE if the entire clip region has been eliminated, else PR_FALSE
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*/
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NS_IMETHOD Paint(nsIRenderingContext& rc, const nsRect& rect,
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PRUint32 aPaintFlags, PRBool &aResult) = 0;
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/**
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* Called to indicate that the specified region of the view
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* needs to be drawn via the rendering context. The region
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* is specified in view coordinates.
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* @param rc rendering context to paint into
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* @param region damage area
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* @param aPaintFlags see nsIView.h for flag definitions
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* @return PR_TRUE if the entire clip region has been eliminated, else PR_FALSE
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*/
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NS_IMETHOD Paint(nsIRenderingContext& rc, const nsIRegion& region,
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PRUint32 aPaintFlags, PRBool &aResult) = 0;
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/**
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* Called to indicate that the specified event should be handled
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* by the view. This method should return nsEventStatus_eConsumeDoDefault
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* or nsEventStatus_eConsumeNoDefault if the event has been handled.
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* @param event event to process
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* @param aEventFlags see nsIView.h for flag definitions
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* @result processing status
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*/
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NS_IMETHOD HandleEvent(nsGUIEvent *event, PRUint32 aEventFlags, nsEventStatus &aStatus) = 0;
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/**
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* Called to indicate that the position of the view has been changed.
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* The specified coordinates are in the parent view's coordinate space.
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* @param x new x position
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* @param y new y position
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*/
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NS_IMETHOD SetPosition(nscoord x, nscoord y) = 0;
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/**
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* Called to get the position of a view.
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* The specified coordinates are in the parent view's coordinate space.
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* @param x out parameter for x position
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* @param y out parameter for y position
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*/
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NS_IMETHOD GetPosition(nscoord *x, nscoord *y) = 0;
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/**
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* Called to indicate that the dimensions of the view (actually the
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* width and height of the clip) have been changed.
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* @param width new width
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* @param height new height
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*/
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NS_IMETHOD SetDimensions(nscoord width, nscoord height, PRBool aPaint = PR_TRUE) = 0;
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NS_IMETHOD GetDimensions(nscoord *width, nscoord *height) = 0;
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/**
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* Called to indicate that the dimensions and position of the view have
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* been changed.
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* @param aBounds new bounds
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*/
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NS_IMETHOD SetBounds(const nsRect &aBounds, PRBool aPaint = PR_TRUE) = 0;
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/**
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* Called to indicate that the dimensions and position of the view have
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* been changed.
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* @param aX new x position
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* @param aY new y position
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* @param aWidth new width
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* @param aHeight new height
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*/
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NS_IMETHOD SetBounds(nscoord aX, nscoord aY,
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nscoord aWidth, nscoord aHeight,
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PRBool aPaint = PR_TRUE) = 0;
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/**
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* Called to get the dimensions and position of the view.
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* @param aBounds out parameter for bounds
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*/
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NS_IMETHOD GetBounds(nsRect &aBounds) const = 0;
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/**
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* Called to indicate that the clip of the view has been changed.
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* The clip is relative to the origin of the view.
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* @param aLeft new left position
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* @param aTop new top position
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* @param aRight new right position
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* @param aBottom new bottom position
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*/
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NS_IMETHOD SetClip(nscoord aLeft, nscoord aTop, nscoord aRight, nscoord aBottom) = 0;
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/**
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* Called to get the dimensions and position of the clip for the view.
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* @param aLeft left position
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* @param aTop top position
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* @param aRight right position
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* @param aBottom bottom position
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* @result PR_TRUE of there actually is a clip for the view, else PR_FALSE
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*/
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NS_IMETHOD GetClip(nscoord *aLeft, nscoord *aTop, nscoord *aRight, nscoord *aBottom,
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PRBool &aResult) = 0;
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/**
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* Called to indicate that the visibility of a view has been
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* changed.
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* @param visibility new visibility state
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*/
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NS_IMETHOD SetVisibility(nsViewVisibility aVisibility) = 0;
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/**
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* Called to query the visibility state of a view.
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* @result current visibility state
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*/
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NS_IMETHOD GetVisibility(nsViewVisibility &aVisibility) = 0;
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/**
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* Called to indicate that the z-index of a view has been changed.
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* The z-index is relative to all siblings of the view.
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* @param zindex new z depth
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*/
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NS_IMETHOD SetZIndex(PRInt32 aZIndex) = 0;
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/**
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* Called to query the z-index of a view.
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* The z-index is relative to all siblings of the view.
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* @result current z depth
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*/
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NS_IMETHOD GetZIndex(PRInt32 &aZIndex) = 0;
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/**
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* Called to set the parent of the view.
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* @param aParent new parent
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*/
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NS_IMETHOD SetParent(nsIView *aParent) = 0;
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/**
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* Called to query the parent of the view.
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* @result view's parent
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*/
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NS_IMETHOD GetParent(nsIView *&aParent) = 0;
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/**
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* Called to query the next sibling of the view.
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* @result view's next sibling
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*/
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NS_IMETHOD GetNextSibling(nsIView *&aNextSibling) const = 0;
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/**
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* Called to set the next sibling of the view.
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* @param aNextSibling new next sibling
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*/
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NS_IMETHOD SetNextSibling(nsIView* aNextSibling) = 0;
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/**
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* Used to insert a child after the specified sibling. In general,
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* child insertion will happen through the view manager and it
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* will determine the ordering of children in the child list.
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* @param child to insert in this view's child list
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* @param sibling view to set as previous sibling of child
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* if nsnull, then child is inserted at head of list
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*/
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NS_IMETHOD InsertChild(nsIView *aChild, nsIView *aSibling) = 0;
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/**
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* Remove a child from the child list. The removal will be driven
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* through the view manager.
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* @param child to remove
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*/
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NS_IMETHOD RemoveChild(nsIView *aChild) = 0;
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/**
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* Get the number of children for this view.
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* @result child count
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*/
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NS_IMETHOD GetChildCount(PRInt32 &aCount) = 0;
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/**
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* Get a child at a specific index. Could be replaced by some sort of
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* enumeration API.
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* @param index of desired child view
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* @result the view at index or nsnull if there is no such child
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*/
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NS_IMETHOD GetChild(PRInt32 index, nsIView*& aChild) = 0;
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/**
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* Note: This didn't exist in 4.0. This transform might include scaling
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* but probably not rotation for the first pass.
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* @param transform new transformation of view
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*/
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NS_IMETHOD SetTransform(nsTransform2D &aXForm) = 0;
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/**
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* Note: This didn't exist in 4.0. This transform might include scaling
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* but probably not rotation for the first pass.
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* @result view's transformation
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*/
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NS_IMETHOD GetTransform(nsTransform2D &aXForm) = 0;
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/**
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* Note: This didn't exist in 4.0. Called to set the opacity of a view.
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* A value of 0.0 means completely transparent. A value of 1.0 means
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* completely opaque.
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* @param opacity new opacity value
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*/
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NS_IMETHOD SetOpacity(float aOpacity) = 0;
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/**
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* Note: This didn't exist in 4.0. Called to set the opacity of a view.
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* A value of 0.0 means completely transparent. A value of 1.0 means
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* completely opaque.
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* @result view's opacity value
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*/
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NS_IMETHOD GetOpacity(float &aOpacity) = 0;
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/**
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* Used to ask a view if it has any areas within its bounding box
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* that are transparent. This is not the same as opacity - opacity can
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* be set externally, transparency is a quality of the view itself.
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* @result Returns PR_TRUE if there are transparent areas, PR_FALSE otherwise.
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*/
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NS_IMETHOD HasTransparency(PRBool &aTransparent) const = 0;
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/**
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* Used set the transparency status of the content in a view. see
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* HasTransparency().
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* @param aTransparent PR_TRUE if there are transparent areas, PR_FALSE otherwise.
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*/
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NS_IMETHOD SetContentTransparency(PRBool aTransparent) = 0;
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/**
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* Set the view's link to client owned data.
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* @param aData - data to associate with view. nsnull to disassociate
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*/
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NS_IMETHOD SetClientData(void *aData) = 0;
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/**
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* Query the view for it's link to client owned data.
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* @result data associated with view or nsnull if there is none.
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*/
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NS_IMETHOD GetClientData(void *&aData) = 0;
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/**
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* Get the nearest widget in this view or a parent of this view and
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* the offset from the view that contains the widget to this view
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* @param aDx out parameter for x offset
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* @param aDy out parameter for y offset
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* @return widget (if there is one) closest to view
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*/
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NS_IMETHOD GetOffsetFromWidget(nscoord *aDx, nscoord *aDy, nsIWidget *&aWidget) = 0;
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/**
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* Gets the dirty region associated with this view. Used by the view
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* manager.
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*/
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NS_IMETHOD GetDirtyRegion(nsIRegion *&aRegion) = 0;
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/**
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* Sets the dirty region associated with this view. Used by the view
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* manager.
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*/
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NS_IMETHOD SetDirtyRegion(nsIRegion *aRegion) = 0;
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/**
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* Create a widget to associate with this view. This is a helper
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* function for SetWidget.
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* @param aWindowIID IID for Widget type that this view
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* should have associated with it. if nsull, then no
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* width will be created for this view
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* @param aWidgetInitData data used to initialize this view's widget before
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* its create is called.
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* @param aNative native window that will be used as parent of
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* aWindowIID. if nsnull, then parent will be derived from
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* parent view and it's ancestors
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* @return error status
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*/
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NS_IMETHOD CreateWidget(const nsIID &aWindowIID,
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nsWidgetInitData *aWidgetInitData = nsnull,
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nsNativeWidget aNative = nsnull) = 0;
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/**
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* Set the widget associated with this view.
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* @param aWidget widget to associate with view. It is an error
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* to associate a widget with more than one view. To disassociate
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* a widget from a view, use nsnull. If there are no more references
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* to the widget that may have been associated with the view, it will
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* be destroyed.
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* @return error status
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*/
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NS_IMETHOD SetWidget(nsIWidget *aWidget) = 0;
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/**
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* In 4.0, the "cutout" nature of a view is queryable.
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* If we believe that all cutout view have a native widget, this
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* could be a replacement.
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* @param aWidget out parameter for widget that this view contains,
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* or nsnull if there is none.
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*/
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NS_IMETHOD GetWidget(nsIWidget *&aWidget) = 0;
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/**
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* Output debug info to FILE
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* @param out output file handle
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* @param aIndent indentation depth
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*/
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virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const = 0;
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/**
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* Set flags on view to allow customization of view behavior during
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* event handling
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* @param aFlags flags to be added to view
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*/
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NS_IMETHOD SetViewFlags(PRInt32 aFlags) = 0;
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/**
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* Remove flags from view to allow customization of view behavior during
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* event handling
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* @param aFlags flags to be removed from view
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*/
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NS_IMETHOD ClearViewFlags(PRInt32 aFlags) = 0;
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private:
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NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
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NS_IMETHOD_(nsrefcnt) Release(void) = 0;
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};
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//this is passed down to child views during painting and event handling
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//so that a child can determine if it is hidden or shown when it's
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//visibility state is set to inherit
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#define NS_VIEW_FLAG_PARENT_HIDDEN 0x0001
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//when painting, if we have determined that we need to do a combination
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//of front to back and back to front painting, this flag will be set
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//while in the back to front pass
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#define NS_VIEW_FLAG_BACK_TO_FRONT 0x0002
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//during event propagation, see if parent views can handle the event
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#define NS_VIEW_FLAG_CHECK_PARENT 0x0004
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//during event propagation, see if child views can handle the event
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#define NS_VIEW_FLAG_CHECK_CHILDREN 0x0008
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//during event propagation, see if sibling views can handle the event
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#define NS_VIEW_FLAG_CHECK_SIBLINGS 0x0010
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//passed down through the class hierarchy
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//to indicate that the clip is set by an
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//outer class
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#define NS_VIEW_FLAG_CLIP_SET 0x0020
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//when painting, if we have determined that we need to do a combination
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//of front to back and back to front painting, this flag will be set
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//while in the front to back pass
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#define NS_VIEW_FLAG_FRONT_TO_BACK 0x0040
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//temporary hack so that michael can work on the new
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//compositor and make checkins without busting the rest
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//of the world.
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#define NS_VIEW_FLAG_JUST_PAINT 0x0080
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//Flag to determine whether the view will check if events can be handled
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//by its children or just handle the events itself
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#define NS_VIEW_FLAG_DONT_CHECK_CHILDREN 0x0001
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#endif
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