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Caches parent DC to be used for GetSystemAttributes, needed for getting scrollbar information (in pixels). r=dcone b=24367

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rods%netscape.com 2000-02-03 15:42:27 +00:00
parent 87ab8dd44a
commit 0644d8c077
2 changed files with 13 additions and 13 deletions
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25
gfx/src/ps/nsDeviceContextPS.cpp
View File

@ -39,7 +39,7 @@ nsDeviceContextPS :: nsDeviceContextPS()
NS_INIT_REFCNT();
mSpec = nsnull;
mParentDeviceContext = nsnull;
}
/** ---------------------------------------------------
@ -59,6 +59,7 @@ PRInt32 i, n;
}
mFontMetrics.Clear();
NS_IF_RELEASE(mSpec);
NS_IF_RELEASE(mParentDeviceContext);
}
@ -79,7 +80,7 @@ NS_IMPL_ISUPPORTS_INHERITED(nsDeviceContextPS,
* @update 12/21/98 dwc
*/
NS_IMETHODIMP
nsDeviceContextPS::InitDeviceContextPS(nsIDeviceContext *aCreatingDeviceContext,nsIDeviceContext *aPrinterContext)
nsDeviceContextPS::InitDeviceContextPS(nsIDeviceContext *aCreatingDeviceContext,nsIDeviceContext *aParentContext)
{
float origscale, newscale;
float t2d, a2d;
@ -90,15 +91,18 @@ float t2d, a2d;
mPixelsToTwips = 1.0f / mTwipsToPixels;
GetTwipsToDevUnits(newscale);
aPrinterContext->GetTwipsToDevUnits(origscale);
aParentContext->GetTwipsToDevUnits(origscale);
mCPixelScale = newscale / origscale;
aPrinterContext->GetTwipsToDevUnits(t2d);
aPrinterContext->GetAppUnitsToDevUnits(a2d);
aParentContext->GetTwipsToDevUnits(t2d);
aParentContext->GetAppUnitsToDevUnits(a2d);
mAppUnitsToDevUnits = (a2d / t2d) * mTwipsToPixels;
mDevUnitsToAppUnits = 1.0f / mAppUnitsToDevUnits;
mParentDeviceContext = aParentContext;
NS_ASSERTION(mParentDeviceContext, "aCreatingDeviceContext cannot be NULL!!!");
NS_ADDREF(mParentDeviceContext);
return NS_OK;
}
@ -231,15 +235,10 @@ NS_IMETHODIMP nsDeviceContextPS :: CheckFontExistence(const nsString& aFontName)
NS_IMETHODIMP nsDeviceContextPS :: GetSystemAttribute(nsSystemAttrID anID, SystemAttrStruct * aInfo) const
{
switch (anID) {
case 0:
break;
default:
break;
if (mParentDeviceContext != nsnull) {
return mParentDeviceContext->GetSystemAttribute(anID, aInfo);
}
return NS_OK;
return NS_ERROR_FAILURE;
}
/** ---------------------------------------------------

1
gfx/src/ps/nsDeviceContextPS.h
View File

@ -88,6 +88,7 @@ protected:
nsDrawingSurface mSurface;
PRUint32 mDepth;
nsIDeviceContextSpec *mSpec;
nsIDeviceContext *mParentDeviceContext;
nsVoidArray mFontMetrics; // we are not using the normal font cache, this is special for PostScript.
nsPostScriptObj *mPSObj;