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Bug 575294. part=3/5 r=roc

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This commit is contained in:
Mats Palmgren 2012-06-23 03:13:56 +02:00
parent 6b60df46d6
commit 5a1b6fa425
1 changed files with 16 additions and 4 deletions
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20
layout/forms/nsListControlFrame.cpp
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@ -584,10 +584,22 @@ nsListControlFrame::ReflowAsDropdown(nsPresContext* aPresContext,
} else {
nscoord bp = aReflowState.mComputedBorderPadding.TopBottom();
nscoord availableHeight = NS_MAX(above, below) - bp;
nscoord height = NS_MIN(visibleHeight, availableHeight);
PRInt32 rows = height / heightOfARow;
mNumDisplayRows = clamped(rows, 1, kMaxDropDownRows);
nscoord newHeight = mNumDisplayRows * heightOfARow;
nscoord newHeight;
PRInt32 rows;
if (visibleHeight <= availableHeight) {
// The dropdown fits in the available height.
rows = GetNumberOfOptions();
mNumDisplayRows = clamped(rows, 1, kMaxDropDownRows);
if (mNumDisplayRows == rows) {
newHeight = visibleHeight; // use the exact height
} else {
newHeight = mNumDisplayRows * heightOfARow; // approximate
}
} else {
rows = availableHeight / heightOfARow;
mNumDisplayRows = clamped(rows, 1, kMaxDropDownRows);
newHeight = mNumDisplayRows * heightOfARow; // approximate
}
state.SetComputedHeight(newHeight);
mDropdownCanGrow = visibleHeight - newHeight >= heightOfARow &&
mNumDisplayRows != kMaxDropDownRows;