void
nsHTMLButtonControlFrame::ReflowButtonContents(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aButtonDesiredSize,
const nsHTMLReflowState& aButtonReflowState,
nsIFrame* aFirstKid)
{
WritingMode wm = GetWritingMode();
LogicalSize availSize = aButtonReflowState.ComputedSize(wm);
availSize.BSize(wm) = NS_INTRINSICSIZE;
// Buttons have some bonus renderer-determined border/padding,
// which occupies part of the button's content-box area:
LogicalMargin focusPadding =
LogicalMargin(wm, mRenderer.GetAddedButtonBorderAndPadding());
// See whether out availSize's inline-size is big enough. If it's
// smaller than our intrinsic min iSize, that means that the kid
// wouldn't really fit. In that case, we overflow into our internal
// focuspadding (which other browsers don't have) so that there's a
// little more space for it.
// Note that GetMinISize includes the focusPadding.
nscoord IOverflow = GetMinISize(aButtonReflowState.rendContext) -
aButtonReflowState.ComputedISize();
nscoord IFocusPadding = focusPadding.IStartEnd(wm);
nscoord focusPaddingReduction = std::min(IFocusPadding,
std::max(IOverflow, 0));
if (focusPaddingReduction > 0) {
nscoord startReduction = focusPadding.IStart(wm);
if (focusPaddingReduction != IFocusPadding) {
startReduction = NSToCoordRound(startReduction *
(float(focusPaddingReduction) /
float(IFocusPadding)));
}
focusPadding.IStart(wm) -= startReduction;
focusPadding.IEnd(wm) -= focusPaddingReduction - startReduction;
}
// shorthand for a value we need to use in a bunch of places
const LogicalMargin& clbp = aButtonReflowState.ComputedLogicalBorderPadding();
// Indent the child inside us by the focus border. We must do this separate
// from the regular border.
availSize.ISize(wm) -= focusPadding.IStartEnd(wm);
LogicalPoint childPos(wm);
childPos.I(wm) = focusPadding.IStart(wm) + clbp.IStart(wm);
availSize.ISize(wm) = std::max(availSize.ISize(wm), 0);
// Give child a clone of the button's reflow state, with height/width reduced
// by focusPadding, so that descendants with height:100% don't protrude.
nsHTMLReflowState adjustedButtonReflowState =
CloneReflowStateWithReducedContentBox(aButtonReflowState,
focusPadding.GetPhysicalMargin(wm));
nsHTMLReflowState contentsReflowState(aPresContext,
adjustedButtonReflowState,
aFirstKid, availSize);
nsReflowStatus contentsReflowStatus;
nsHTMLReflowMetrics contentsDesiredSize(aButtonReflowState);
childPos.B(wm) = 0; // This will be set properly later, after reflowing the
// child to determine its size.
// We just pass a dummy containerSize here, as the child will be
// repositioned later by FinishReflowChild.
nsSize dummyContainerSize;
ReflowChild(aFirstKid, aPresContext,
contentsDesiredSize, contentsReflowState,
wm, childPos, dummyContainerSize, 0, contentsReflowStatus);
MOZ_ASSERT(NS_FRAME_IS_COMPLETE(contentsReflowStatus),
"We gave button-contents frame unconstrained available height, "
"so it should be complete");
// Compute the button's content-box size:
LogicalSize buttonContentBox(wm);
if (aButtonReflowState.ComputedBSize() != NS_INTRINSICSIZE) {
// Button has a fixed block-size -- that's its content-box bSize.
buttonContentBox.BSize(wm) = aButtonReflowState.ComputedBSize();
} else {
// Button is intrinsically sized -- it should shrinkwrap the
// button-contents' bSize, plus any focus-padding space:
buttonContentBox.BSize(wm) =
contentsDesiredSize.BSize(wm) + focusPadding.BStartEnd(wm);
// Make sure we obey min/max-bSize in the case when we're doing intrinsic
// sizing (we get it for free when we have a non-intrinsic
// aButtonReflowState.ComputedBSize()). Note that we do this before
// adjusting for borderpadding, since mComputedMaxBSize and
// mComputedMinBSize are content bSizes.
buttonContentBox.BSize(wm) =
NS_CSS_MINMAX(buttonContentBox.BSize(wm),
aButtonReflowState.ComputedMinBSize(),
aButtonReflowState.ComputedMaxBSize());
}
if (aButtonReflowState.ComputedISize() != NS_INTRINSICSIZE) {
buttonContentBox.ISize(wm) = aButtonReflowState.ComputedISize();
} else {
buttonContentBox.ISize(wm) =
contentsDesiredSize.ISize(wm) + focusPadding.IStartEnd(wm);
buttonContentBox.ISize(wm) =
NS_CSS_MINMAX(buttonContentBox.ISize(wm),
aButtonReflowState.ComputedMinISize(),
aButtonReflowState.ComputedMaxISize());
}
// Center child in the block-direction in the button
// (technically, inside of the button's focus-padding area)
nscoord extraSpace =
buttonContentBox.BSize(wm) - focusPadding.BStartEnd(wm) -
contentsDesiredSize.BSize(wm);
childPos.B(wm) = std::max(0, extraSpace / 2);
// Adjust childPos.B() to be in terms of the button's frame-rect, instead of
// its focus-padding rect:
childPos.B(wm) += focusPadding.BStart(wm) + clbp.BStart(wm);
nsSize containerSize =
(buttonContentBox + clbp.Size(wm)).GetPhysicalSize(wm);
// Place the child
FinishReflowChild(aFirstKid, aPresContext,
contentsDesiredSize, &contentsReflowState,
wm, childPos, containerSize, 0);
// Make sure we have a useful 'ascent' value for the child
if (contentsDesiredSize.BlockStartAscent() ==
nsHTMLReflowMetrics::ASK_FOR_BASELINE) {
WritingMode wm = aButtonReflowState.GetWritingMode();
contentsDesiredSize.SetBlockStartAscent(aFirstKid->GetLogicalBaseline(wm));
}
// OK, we're done with the child frame.
// Use what we learned to populate the button frame's reflow metrics.
// * Button's height & width are content-box size + border-box contribution:
aButtonDesiredSize.SetSize(wm,
LogicalSize(wm, aButtonReflowState.ComputedISize() + clbp.IStartEnd(wm),
buttonContentBox.BSize(wm) + clbp.BStartEnd(wm)));
// * Button's ascent is its child's ascent, plus the child's block-offset
// within our frame... unless it's orthogonal, in which case we'll use the
// contents inline-size as an approximation for now.
// XXX is there a better strategy? should we include border-padding?
if (aButtonDesiredSize.GetWritingMode().IsOrthogonalTo(wm)) {
aButtonDesiredSize.SetBlockStartAscent(contentsDesiredSize.ISize(wm));
} else {
aButtonDesiredSize.SetBlockStartAscent(contentsDesiredSize.BlockStartAscent() +
childPos.B(wm));
}
aButtonDesiredSize.SetOverflowAreasToDesiredBounds();
}
