bool CXbtFile::HasImageAlpha() const
{
CXBTFFrame frame;
if (!GetFirstFrame(frame))
return false;
return frame.HasAlpha();
}
uint32_t CXbtFile::GetImageFormat() const
{
CXBTFFrame frame;
if (!GetFirstFrame(frame))
return false;
return frame.GetFormat();
}
bool
nsListBoxBodyFrame::ContinueReflow(nscoord height)
{
#ifdef ACCESSIBILITY
if (nsIPresShell::IsAccessibilityActive()) {
// Create all the frames at once so screen readers and
// onscreen keyboards can see the full list right away
return true;
}
#endif
if (height <= 0) {
nsIFrame* lastChild = GetLastFrame();
nsIFrame* startingPoint = mBottomFrame;
if (startingPoint == nsnull) {
// We just want to delete everything but the first item.
startingPoint = GetFirstFrame();
}
if (lastChild != startingPoint) {
// We have some hangers on (probably caused by shrinking the size of the window).
// Nuke them.
nsIFrame* currFrame = startingPoint->GetNextSibling();
nsBoxLayoutState state(PresContext());
nsCSSFrameConstructor* fc =
PresContext()->PresShell()->FrameConstructor();
fc->BeginUpdate();
while (currFrame) {
nsIFrame* nextFrame = currFrame->GetNextSibling();
RemoveChildFrame(state, currFrame);
currFrame = nextFrame;
}
fc->EndUpdate();
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
return false;
}
else
return true;
}
void
nsListBoxBodyFrame::DestroyRows(PRInt32& aRowsToLose)
{
// We need to destroy frames until our row count has been properly
// reduced. A reflow will then pick up and create the new frames.
nsIFrame* childFrame = GetFirstFrame();
nsBoxLayoutState state(PresContext());
nsCSSFrameConstructor* fc = PresContext()->PresShell()->FrameConstructor();
fc->BeginUpdate();
while (childFrame && aRowsToLose > 0) {
--aRowsToLose;
nsIFrame* nextFrame = childFrame->GetNextSibling();
RemoveChildFrame(state, childFrame);
mTopFrame = childFrame = nextFrame;
}
fc->EndUpdate();
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
//
// Get the nsIBox for the first visible listitem, and if none exists,
// create one.
//
nsIBox*
nsListBoxBodyFrame::GetFirstItemBox(PRInt32 aOffset, bool* aCreated)
{
if (aCreated)
*aCreated = false;
// Clear ourselves out.
mBottomFrame = mTopFrame;
if (mTopFrame) {
return mTopFrame->IsBoxFrame() ? static_cast<nsIBox*>(mTopFrame) : nsnull;
}
// top frame was cleared out
mTopFrame = GetFirstFrame();
mBottomFrame = mTopFrame;
if (mTopFrame && mRowsToPrepend <= 0) {
return mTopFrame->IsBoxFrame() ? static_cast<nsIBox*>(mTopFrame) : nsnull;
}
// At this point, we either have no frames at all,
// or the user has scrolled upwards, leaving frames
// to be created at the top. Let's determine which
// content needs a new frame first.
nsCOMPtr<nsIContent> startContent;
if (mTopFrame && mRowsToPrepend > 0) {
// We need to insert rows before the top frame
nsIContent* topContent = mTopFrame->GetContent();
nsIContent* topParent = topContent->GetParent();
PRInt32 contentIndex = topParent->IndexOf(topContent);
contentIndex -= aOffset;
if (contentIndex < 0)
return nsnull;
startContent = topParent->GetChildAt(contentIndex - mRowsToPrepend);
} else {
// This will be the first item frame we create. Use the content
// at the current index, which is the first index scrolled into view
GetListItemContentAt(mCurrentIndex+aOffset, getter_AddRefs(startContent));
}
if (startContent) {
nsIFrame* existingFrame;
if (!IsListItemChild(this, startContent, &existingFrame)) {
return GetFirstItemBox(++aOffset, aCreated);
}
if (existingFrame) {
return existingFrame->IsBoxFrame() ? existingFrame : nsnull;
}
// Either append the new frame, or prepend it (at index 0)
// XXX check here if frame was even created, it may not have been if
// display: none was on listitem content
bool isAppend = mRowsToPrepend <= 0;
nsPresContext* presContext = PresContext();
nsCSSFrameConstructor* fc = presContext->PresShell()->FrameConstructor();
nsIFrame* topFrame = nsnull;
fc->CreateListBoxContent(presContext, this, nsnull, startContent,
&topFrame, isAppend, false, nsnull);
mTopFrame = topFrame;
if (mTopFrame) {
if (aCreated)
*aCreated = true;
mBottomFrame = mTopFrame;
return mTopFrame->IsBoxFrame() ? static_cast<nsIBox*>(mTopFrame) : nsnull;
} else
return GetFirstItemBox(++aOffset, 0);
}
return nsnull;
}
