RetroZilla/view/public/nsIView.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 of 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 MPL, 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 MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsIView_h___
#define nsIView_h___
#include "nsCoord.h"
#include "nsRect.h"
#include "nsPoint.h"
#include <stdio.h>
#include "nsIWidget.h"
class nsIViewManager;
class nsIScrollableView;
class nsViewManager;
class nsView;
class nsWeakView;
struct nsRect;
// Enumerated type to indicate the visibility of a layer.
// hide - the layer is not shown.
// show - the layer is shown irrespective of the visibility of
// the layer's parent.
enum nsViewVisibility {
nsViewVisibility_kHide = 0,
nsViewVisibility_kShow = 1
};
// IID for the nsIView interface
#define NS_IVIEW_IID \
{ 0x658f72ee, 0x32ef, 0x4e93, \
{ 0xb8, 0x4e, 0x5f, 0x0f, 0x8f, 0x77, 0xe4, 0x22 } }
// Public view flags are defined in this file
#define NS_VIEW_FLAGS_PUBLIC 0x00FF
// Private view flags are private to the view module,
// and are defined in nsView.h
#define NS_VIEW_FLAGS_PRIVATE 0xFF00
// Public view flags
// The view is transparent
#define NS_VIEW_FLAG_TRANSPARENT 0x0001
// The view is always painted onto a background consisting
// of a uniform field of opaque pixels.
#define NS_VIEW_FLAG_UNIFORM_BACKGROUND 0x0002
// Indicates that the view is using auto z-indexing
#define NS_VIEW_FLAG_AUTO_ZINDEX 0x0004
// Indicates that the view is a floating view.
#define NS_VIEW_FLAG_FLOATING 0x0008
// If set it indicates that this view should be
// displayed above z-index:auto views if this view
// is z-index:auto also
#define NS_VIEW_FLAG_TOPMOST 0x0010
struct nsViewZIndex {
PRBool mIsAuto;
PRInt32 mZIndex;
PRBool mIsTopmost;
nsViewZIndex(PRBool aIsAuto, PRInt32 aZIndex, PRBool aIsTopmost)
: mIsAuto(aIsAuto), mZIndex(aZIndex), mIsTopmost(aIsTopmost) {}
};
//----------------------------------------------------------------------
/**
* View interface
*
* Views are NOT reference counted. Use the Destroy() member function to
* destroy a view.
*
* The lifetime of the view hierarchy is bounded by the lifetime of the
* view manager that owns the views.
*
* Most of the methods here are read-only. To set the corresponding properties
* of a view, go through nsIViewManager.
*/
class nsIView
{
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IVIEW_IID)
/**
* See if this view is scrollable.
* @result an nsIScrollableView* if the view is scrollable, or nsnull if not.
*/
virtual nsIScrollableView* ToScrollableView() { return nsnull; }
/**
* Find the view for the given widget, if there is one.
* @return the view the widget belongs to, or null if the widget doesn't
* belong to any view.
*/
static nsIView* GetViewFor(nsIWidget* aWidget);
/**
* Get the view manager which "owns" the view.
* This method might require some expensive traversal work in the future. If you can get the
* view manager from somewhere else, do that instead.
* @result the view manager
*/
nsIViewManager* GetViewManager() const
{ return NS_REINTERPRET_CAST(nsIViewManager*, mViewManager); }
/**
* Destroy the view.
*
* The view destroys its child views, and destroys and releases its
* widget (if it has one).
*
* Also informs the view manager that the view is destroyed by calling
* SetRootView(NULL) if the view is the root view and calling RemoveChild()
* otherwise.
*/
void Destroy();
/**
* Called to get the position of a view.
* The specified coordinates are in the parent view's coordinate space.
* This is the (0, 0) origin of the coordinate space established by this view.
* @param x out parameter for x position
* @param y out parameter for y position
*/
nsPoint GetPosition() const {
// Call ExternalIsRoot here so that we can get to it from other
// components
NS_ASSERTION(!ExternalIsRoot() || (mPosX == 0 && mPosY == 0),
"root views should always have explicit position of (0,0)");
return nsPoint(mPosX, mPosY);
}
/**
* Called to get the dimensions and position of the view's bounds.
* The view's bounds (x,y) are in the coordinate space of the parent view.
* The view's bounds (x,y) might not be the same as the view's position,
* if the view has content above or to the left of its origin.
* @param aBounds out parameter for bounds
*/
nsRect GetBounds() const { return mDimBounds; }
/**
* Get the offset between the coordinate systems of |this| and aOther.
* Adding the return value to a point in the coordinate system of |this|
* will transform the point to the coordinate system of aOther.
*
* If aOther is null, this will return the offset of |this| from the
* root of the viewmanager tree.
*
* This function is fastest when aOther is an ancestor of |this|.
*
* NOTE: this actually returns the offset from aOther to |this|, but
* that offset is added to transform _coordinates_ from |this| to aOther.
*/
nsPoint GetOffsetTo(const nsIView* aOther) const;
/**
* Get the screen position of the view.
* @return the pixel position of the top-left of the view in screen
* coordinates.
*/
nsIntPoint GetScreenPosition() const;
/**
* Called to query the visibility state of a view.
* @result current visibility state
*/
nsViewVisibility GetVisibility() const { return mVis; }
/**
* Called to query the z-index of a view.
* The z-index is relative to all siblings of the view.
* @result mZIndex: explicit z-index value or 0 if none is set
* mIsAuto: PR_TRUE if the view is zindex:auto
* mIsTopMost: used when this view is zindex:auto
* PR_TRUE if the view is topmost when compared
* with another z-index:auto view
*/
nsViewZIndex GetZIndex() const { return nsViewZIndex((mVFlags & NS_VIEW_FLAG_AUTO_ZINDEX) != 0,
mZIndex,
(mVFlags & NS_VIEW_FLAG_TOPMOST) != 0); }
/**
* Get 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.
* @result PR_TRUE if the view floats, PR_FALSE otherwise.
*/
PRBool GetFloating() const { return (mVFlags & NS_VIEW_FLAG_FLOATING) != 0; }
/**
* Called to query the parent of the view.
* @result view's parent
*/
nsIView* GetParent() const { return NS_REINTERPRET_CAST(nsIView*, mParent); }
/**
* The view's first child is the child which is earliest in document order.
* @result first child
*/
nsIView* GetFirstChild() const { return NS_REINTERPRET_CAST(nsIView*, mFirstChild); }
/**
* Called to query the next sibling of the view.
* @result view's next sibling
*/
nsIView* GetNextSibling() const { return NS_REINTERPRET_CAST(nsIView*, mNextSibling); }
/**
* Note: This didn't exist in 4.0. Called to get the opacity of a view.
* A value of 0.0 means completely transparent. A value of 1.0 means
* completely opaque.
* @result view's opacity value
*/
float GetOpacity() const { return mOpacity; }
/**
* Used to ask a view if it has any areas within its bounding box
* that are transparent. This is not the same as opacity - opacity can
* be set externally, transparency is a quality of the view itself.
* @result Returns PR_TRUE if there are transparent areas, PR_FALSE otherwise.
*/
PRBool IsTransparent() const { return (mVFlags & NS_VIEW_FLAG_TRANSPARENT) != 0; }
/**
* Indicate that this view is always painted onto a uniform field of
* pixels. Thus, even if the view is transparent, it may still be
* bitblit scrollable because the background that shines through
* does not vary with position. Caller must ensure that the pixel
* field belongs to the same element as this view or some ancestor
* element, so that if the pixel field is in some opacity group, then
* this view is also in the opacity group (or some subgroup).
*/
void SetHasUniformBackground(PRBool aUniform) {
if (aUniform) {
mVFlags |= NS_VIEW_FLAG_UNIFORM_BACKGROUND;
} else {
mVFlags &= ~NS_VIEW_FLAG_UNIFORM_BACKGROUND;
}
}
PRBool HasUniformBackground() {
return mVFlags & NS_VIEW_FLAG_UNIFORM_BACKGROUND;
}
/**
* Set the view's link to client owned data.
* @param aData - data to associate with view. nsnull to disassociate
*/
void SetClientData(void *aData) { mClientData = aData; }
/**
* Query the view for it's link to client owned data.
* @result data associated with view or nsnull if there is none.
*/
void* GetClientData() const { return mClientData; }
/**
* Get the nearest widget in this view or a parent of this view and
* the offset from the widget's origin to this view's origin
* @param aOffset the offset from this view's origin to the widget's origin
* (usually positive)
* @return the widget closest to this view; can be null because some view trees
* don't have widgets at all (e.g., printing), but if any view in the view tree
* has a widget, then it's safe to assume this will not return null
* XXX Remove this 'virtual' when gfx+widget are merged into gklayout;
* Mac widget depends on this method, which is BOGUS!
*/
virtual nsIWidget* GetNearestWidget(nsPoint* aOffset) const;
/**
* Create a widget to associate with this view.
* @param aWindowIID IID for Widget type that this view
* should have associated with it. if nsull, then no
* width will be created for this view
* @param aWidgetInitData data used to initialize this view's widget before
* its create is called.
* @param aNative native window that will be used as parent of
* aWindowIID. if nsnull, then parent will be derived from
* parent view and it's ancestors
* @param aWindowType is either content, UI or inherit from parent window.
* This is used to expose what type of window this is to
* assistive technology like screen readers.
* @return error status
*/
nsresult CreateWidget(const nsIID &aWindowIID,
nsWidgetInitData *aWidgetInitData = nsnull,
nsNativeWidget aNative = nsnull,
PRBool aEnableDragDrop = PR_TRUE,
PRBool aResetVisibility = PR_TRUE,
nsContentType aWindowType = eContentTypeInherit);
/**
* In 4.0, the "cutout" nature of a view is queryable.
* If we believe that all cutout view have a native widget, this
* could be a replacement.
* @param aWidget out parameter for widget that this view contains,
* or nsnull if there is none.
*/
nsIWidget* GetWidget() const { return mWindow; }
/**
* Returns PR_TRUE if the view has a widget associated with it.
*/
PRBool HasWidget() const { return mWindow != nsnull; }
#ifdef DEBUG
/**
* Output debug info to FILE
* @param out output file handle
* @param aIndent indentation depth
* NOTE: virtual so that debugging tools not linked into gklayout can access it
*/
virtual void List(FILE* out, PRInt32 aIndent = 0) const;
#endif // DEBUG
/**
* @result true iff this is the root view for its view manager
*/
PRBool IsRoot() const;
virtual PRBool ExternalIsRoot() const;
protected:
nsViewManager *mViewManager;
nsView *mParent;
nsIWidget *mWindow;
nsView *mNextSibling;
nsView *mFirstChild;
void *mClientData;
PRInt32 mZIndex;
nsViewVisibility mVis;
nscoord mPosX, mPosY;
nsRect mDimBounds; // relative to parent
float mOpacity;
PRUint32 mVFlags;
virtual ~nsIView() {}
};
// This is not a real interface! Used only by nsWeakView.
class nsIView_MOZILLA_1_8_BRANCH : public nsIView
{
public:
void SetDeletionObserver(nsWeakView* aDeletionObserver);
protected:
friend class nsWeakView;
nsWeakView* mDeletionObserver;
};
// nsWeakViews must *not* be used in heap!
class nsWeakView
{
public:
nsWeakView(nsIView* aView)
: mPrev(nsnull), mView(NS_STATIC_CAST(nsIView_MOZILLA_1_8_BRANCH*, aView))
{
if (mView) {
mView->SetDeletionObserver(this);
}
}
~nsWeakView()
{
if (mView) {
NS_ASSERTION(mView->mDeletionObserver == this,
"nsWeakViews deleted in wrong order!");
// Clear deletion observer temporarily.
mView->SetDeletionObserver(nsnull);
// Put back the previous deletion observer.
mView->SetDeletionObserver(mPrev);
}
}
PRBool IsAlive() { return !!mView; }
nsIView* GetView() { return mView; }
void SetPrevious(nsWeakView* aWeakView) { mPrev = aWeakView; }
void Clear()
{
if (mPrev) {
mPrev->Clear();
}
mView = nsnull;
}
private:
static void* operator new(size_t) CPP_THROW_NEW { return 0; }
static void operator delete(void*, size_t) {}
nsWeakView* mPrev;
nsIView_MOZILLA_1_8_BRANCH* mView;
};
#endif