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Bug 761188 - reuse layout code for accessible boundaries calculation, r=tbsaunde, f=bz

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This commit is contained in:
Alexander Surkov 2012-06-10 22:31:27 +09:00
parent 6865bb0c16
commit eeae34a2b5
1 changed files with 6 additions and 80 deletions
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86
accessible/src/generic/Accessible.cpp
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@ -881,89 +881,15 @@ Accessible::GetDeepestChildAtPoint(PRInt32 aX, PRInt32 aY,
void
Accessible::GetBoundsRect(nsRect& aTotalBounds, nsIFrame** aBoundingFrame)
{
/*
* This method is used to determine the bounds of a content node.
* Because HTML wraps and links are not always rectangular, this
* method uses the following algorithm:
*
* 1) Start with an empty rectangle
* 2) Add the rect for the primary frame from for the DOM node.
* 3) For each next frame at the same depth with the same DOM node, add that rect to total
* 4) If that frame is an inline frame, search deeper at that point in the tree, adding all rects
*/
// Initialization area
*aBoundingFrame = nsnull;
nsIFrame* firstFrame = GetFrame();
if (!firstFrame)
return;
// Find common relative parent
// This is an ancestor frame that will incompass all frames for this content node.
// We need the relative parent so we can get absolute screen coordinates
nsIFrame *ancestorFrame = firstFrame;
while (ancestorFrame) {
*aBoundingFrame = ancestorFrame;
// If any other frame type, we only need to deal with the primary frame
// Otherwise, there may be more frames attached to the same content node
if (ancestorFrame->GetType() != nsGkAtoms::inlineFrame &&
ancestorFrame->GetType() != nsGkAtoms::textFrame)
break;
ancestorFrame = ancestorFrame->GetParent();
}
nsIFrame *iterFrame = firstFrame;
nsCOMPtr<nsIContent> firstContent(mContent);
nsIContent* iterContent = firstContent;
PRInt32 depth = 0;
// Look only at frames below this depth, or at this depth (if we're still on the content node we started with)
while (iterContent == firstContent || depth > 0) {
// Coordinates will come back relative to parent frame
nsRect currFrameBounds = iterFrame->GetRect();
// Make this frame's bounds relative to common parent frame
currFrameBounds +=
iterFrame->GetParent()->GetOffsetToExternal(*aBoundingFrame);
// Add this frame's bounds to total
aTotalBounds.UnionRect(aTotalBounds, currFrameBounds);
nsIFrame *iterNextFrame = nsnull;
if (iterFrame->GetType() == nsGkAtoms::inlineFrame) {
// Only do deeper bounds search if we're on an inline frame
// Inline frames can contain larger frames inside of them
iterNextFrame = iterFrame->GetFirstPrincipalChild();
}
if (iterNextFrame)
++depth; // Child was found in code above this: We are going deeper in this iteration of the loop
else {
// Use next sibling if it exists, or go back up the tree to get the first next-in-flow or next-sibling
// within our search
while (iterFrame) {
iterNextFrame = iterFrame->GetNextContinuation();
if (!iterNextFrame)
iterNextFrame = iterFrame->GetNextSibling();
if (iterNextFrame || --depth < 0)
break;
iterFrame = iterFrame->GetParent();
}
}
// Get ready for the next round of our loop
iterFrame = iterNextFrame;
if (iterFrame == nsnull)
break;
iterContent = nsnull;
if (depth == 0)
iterContent = iterFrame->GetContent();
nsIFrame* frame = GetFrame();
if (frame) {
*aBoundingFrame = nsLayoutUtils::GetContainingBlockForClientRect(frame);
aTotalBounds = nsLayoutUtils::
GetAllInFlowRectsUnion(frame, *aBoundingFrame,
nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS);
}
}
/* void getBounds (out long x, out long y, out long width, out long height); */
NS_IMETHODIMP
Accessible::GetBounds(PRInt32* aX, PRInt32* aY,