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lightning-sunbird  0.9+nobinonly
nsChildWindow.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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00015  * The Original Code is mozilla.org code.
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00017  * The Initial Developer of the Original Code is
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00024  * Alternatively, the contents of this file may be used under the terms of
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00037 
00038 #include "nsChildWindow.h"
00039 #include "nsCOMPtr.h"
00040 #include "nsRegionPool.h"
00041 
00042 //-------------------------------------------------------------------------
00043 //
00044 //-------------------------------------------------------------------------
00045 
00046 nsChildWindow::nsChildWindow() : nsWindow()
00047 {
00048        WIDGET_SET_CLASSNAME("nsChildWindow");
00049        mClipChildren = PR_FALSE;
00050        mClipSiblings = PR_FALSE;
00051 }
00052 
00053 
00054 nsChildWindow::~nsChildWindow()
00055 {
00056 }
00057 
00058 //-------------------------------------------------------------------------
00059 //
00060 //
00061 //-------------------------------------------------------------------------
00062 
00063 nsresult nsChildWindow::StandardCreate(nsIWidget *aParent,
00064                       const nsRect &aRect,
00065                       EVENT_CALLBACK aHandleEventFunction,
00066                       nsIDeviceContext *aContext,
00067                       nsIAppShell *aAppShell,
00068                       nsIToolkit *aToolkit,
00069                       nsWidgetInitData *aInitData,
00070                       nsNativeWidget aNativeParent)     // should always be nil here
00071 {
00072        if (aInitData)
00073        {
00074               mClipChildren = aInitData->clipChildren;
00075               mClipSiblings = aInitData->clipSiblings;
00076        }
00077 
00078        return Inherited::StandardCreate(aParent,
00079                       aRect,
00080                       aHandleEventFunction,
00081                       aContext,
00082                       aAppShell,
00083                       aToolkit,
00084                       aInitData,
00085                       aNativeParent);
00086 }
00087 
00088 //-------------------------------------------------------------------------
00089 //
00090 //
00091 //-------------------------------------------------------------------------
00092 
00093 void nsChildWindow::CalcWindowRegions()
00094 {
00095   Inherited::CalcWindowRegions();
00096 
00097   // clip the siblings out of the window region and visRegion 
00098   if (mClipSiblings && mParent && !mIsTopWidgetWindow) {
00099     // need to walk the siblings backwards, to get clipping right.
00100     nsWindow* sibling = NS_STATIC_CAST(nsWindow*, mParent->GetLastChild());
00101     if (!sibling)
00102       return;
00103 
00104     StRegionFromPool siblingRgn;
00105     if (siblingRgn == nsnull)
00106       return;
00107 
00108     do {
00109       if (sibling == NS_STATIC_CAST(nsWindow*, this))
00110         break;
00111 
00112       PRBool visible;
00113       sibling->IsVisible(visible);
00114       if (visible && !sibling->IsTopLevelWidgetWindow()) {
00115         // don't clip if not visible or if a top-level window.
00116         // get sibling's bounds in parent's coordinate system.
00117         nsRect siblingRect;
00118         sibling->GetBounds(siblingRect);
00119 
00120         // transform from parent's coordinate system to widget coordinates.
00121         siblingRect.MoveBy(-mBounds.x, -mBounds.y);
00122 
00123         Rect macRect;
00124         ::SetRect(&macRect, siblingRect.x, siblingRect.y,
00125                   siblingRect.XMost(), siblingRect.YMost());
00126         ::RectRgn(siblingRgn, &macRect);
00127         ::DiffRgn(mWindowRegion, siblingRgn, mWindowRegion);
00128         ::DiffRgn(mVisRegion, siblingRgn, mVisRegion);
00129       }
00130       sibling = NS_STATIC_CAST(nsWindow*, sibling->GetPrevSibling());
00131     } while (sibling);
00132   }
00133 }