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Bug 333659. Relanding new nsLayoutUtils APIs --- shouldn't affect current code. r=dbaron

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This commit is contained in:
roc+%cs.cmu.edu 2007-01-17 02:37:19 +00:00
parent e6589f0930
commit f526665413
2 changed files with 46 additions and 0 deletions
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32
layout/base/nsLayoutUtils.cpp
View File

@ -58,6 +58,7 @@
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsFrameManager.h"
#include "nsBlockFrame.h"
#ifdef MOZ_SVG_FOREIGNOBJECT
#include "nsSVGForeignObjectFrame.h"
@ -998,6 +999,37 @@ nsLayoutUtils::GetFontMetricsForFrame(nsIFrame* aFrame,
*aFontMetrics);
}
nsIFrame*
nsLayoutUtils::FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame)
{
nsIFrame* result = aDescendantFrame;
while (result) {
nsIFrame* parent = result->GetParent();
if (parent == aParent) {
break;
}
// The frame is not an immediate child of aParent so walk up another level
result = parent;
}
return result;
}
nsBlockFrame*
nsLayoutUtils::FindNearestBlockAncestor(nsIFrame* aFrame)
{
nsIFrame* nextAncestor;
for (nextAncestor = aFrame->GetParent(); nextAncestor;
nextAncestor = nextAncestor->GetParent()) {
nsBlockFrame* block;
if (NS_SUCCEEDED(nextAncestor->QueryInterface(kBlockFrameCID, (void**)&block)))
return block;
}
return nsnull;
}
nsIFrame*
nsLayoutUtils::GetParentOrPlaceholderFor(nsFrameManager* aFrameManager,
nsIFrame* aFrame)

14
layout/base/nsLayoutUtils.h
View File

@ -56,6 +56,8 @@ class nsIFontMetrics;
#include "nsStyleSet.h"
#include "nsIView.h"
class nsBlockFrame;
/**
* nsLayoutUtils is a namespace class used for various helper
* functions that are useful in multiple places in layout. The goal
@ -432,6 +434,18 @@ public:
static nsresult GetFontMetricsForFrame(nsIFrame* aFrame,
nsIFontMetrics** aFontMetrics);
/**
* Find the immediate child of aParent whose frame subtree contains
* aDescendantFrame. Returns null if aDescendantFrame is not a descendant
* of aParent.
*/
static nsIFrame* FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame);
/**
* Find the nearest ancestor that's a block
*/
static nsBlockFrame* FindNearestBlockAncestor(nsIFrame* aFrame);
/**
* If aFrame is an out of flow frame, return its placeholder, otherwise
* return its parent.