//
// Get the nsIBox for the next visible listitem after aBox, and if none
// exists, create one.
//
nsIBox*
nsListBoxBodyFrame::GetNextItemBox(nsIBox* aBox, PRInt32 aOffset,
bool* aCreated)
{
if (aCreated)
*aCreated = false;
nsIFrame* result = aBox->GetNextSibling();
if (!result || result == mLinkupFrame || mRowsToPrepend > 0) {
// No result found. See if there's a content node that wants a frame.
nsIContent* prevContent = aBox->GetContent();
nsIContent* parentContent = prevContent->GetParent();
PRInt32 i = parentContent->IndexOf(prevContent);
PRUint32 childCount = parentContent->GetChildCount();
if (((PRUint32)i + aOffset + 1) < childCount) {
// There is a content node that wants a frame.
nsIContent *nextContent = parentContent->GetChildAt(i + aOffset + 1);
nsIFrame* existingFrame;
if (!IsListItemChild(this, nextContent, &existingFrame)) {
return GetNextItemBox(aBox, ++aOffset, aCreated);
}
if (!existingFrame) {
// Either append the new frame, or insert it after the current frame
bool isAppend = result != mLinkupFrame && mRowsToPrepend <= 0;
nsIFrame* prevFrame = isAppend ? nsnull : aBox;
nsPresContext* presContext = PresContext();
nsCSSFrameConstructor* fc = presContext->PresShell()->FrameConstructor();
fc->CreateListBoxContent(presContext, this, prevFrame, nextContent,
&result, isAppend, false, nsnull);
if (result) {
if (aCreated)
*aCreated = true;
} else
return GetNextItemBox(aBox, ++aOffset, aCreated);
} else {
result = existingFrame;
}
mLinkupFrame = nsnull;
}
}
if (!result)
return nsnull;
mBottomFrame = result;
NS_ASSERTION(!result->IsBoxFrame() || result->GetParent() == this,
"returning frame that is not in childlist");
return result->IsBoxFrame() ? result : nsnull;
}
//
// Get the nsIBox for the next visible listitem after aBox, and if none
// exists, create one.
//
nsIBox*
nsListBoxBodyFrame::GetNextItemBox(nsIBox* aBox, PRInt32 aOffset,
PRBool* aCreated)
{
if (aCreated)
*aCreated = PR_FALSE;
nsIFrame* result = aBox->GetNextSibling();
if (!result || result == mLinkupFrame || mRowsToPrepend > 0) {
// No result found. See if there's a content node that wants a frame.
nsIContent* prevContent = aBox->GetContent();
nsIContent* parentContent = prevContent->GetParent();
PRInt32 i = parentContent->IndexOf(prevContent);
PRUint32 childCount = parentContent->GetChildCount();
if (((PRUint32)i + aOffset + 1) < childCount) {
// There is a content node that wants a frame.
nsIContent *nextContent = parentContent->GetChildAt(i + aOffset + 1);
// Either append the new frame, or insert it after the current frame
PRBool isAppend = result != mLinkupFrame && mRowsToPrepend <= 0;
nsIFrame* prevFrame = isAppend ? nsnull : aBox;
nsPresContext* presContext = PresContext();
nsCSSFrameConstructor* fc = presContext->PresShell()->FrameConstructor();
fc->CreateListBoxContent(presContext, this, prevFrame, nextContent,
&result, isAppend, PR_FALSE, nsnull);
if (result) {
if (aCreated)
*aCreated = PR_TRUE;
} else
return GetNextItemBox(aBox, ++aOffset, aCreated);
mLinkupFrame = nsnull;
}
}
if (!result)
return nsnull;
mBottomFrame = result;
return result->IsBoxFrame() ? result : nsnull;
}
void
nsListBoxBodyFrame::CreateRows()
{
// Get our client rect.
nsRect clientRect;
GetClientRect(clientRect);
// Get the starting y position and the remaining available
// height.
nscoord availableHeight = GetAvailableHeight();
if (availableHeight <= 0) {
bool fixed = (GetFixedRowSize() != -1);
if (fixed)
availableHeight = 10;
else
return;
}
// get the first tree box. If there isn't one create one.
bool created = false;
nsIBox* box = GetFirstItemBox(0, &created);
nscoord rowHeight = GetRowHeightAppUnits();
while (box) {
if (created && mRowsToPrepend > 0)
--mRowsToPrepend;
// if the row height is 0 then fail. Wait until someone
// laid out and sets the row height.
if (rowHeight == 0)
return;
availableHeight -= rowHeight;
// should we continue? Is the enought height?
if (!ContinueReflow(availableHeight))
break;
// get the next tree box. Create one if needed.
box = GetNextItemBox(box, 0, &created);
}
mRowsToPrepend = 0;
mLinkupFrame = nsnull;
}
