gecko-dev/layout/forms/nsHTMLButtonControlFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsHTMLButtonControlFrame.h"
#include "nsContainerFrame.h"
#include "nsIFormControlFrame.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsButtonFrameRenderer.h"
#include "nsCSSAnonBoxes.h"
#include "nsFormControlFrame.h"
#include "nsNameSpaceManager.h"
#include "nsDisplayList.h"
#include <algorithm>
using namespace mozilla;
nsContainerFrame*
NS_NewHTMLButtonControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsHTMLButtonControlFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsHTMLButtonControlFrame)
nsHTMLButtonControlFrame::nsHTMLButtonControlFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext)
{
}
nsHTMLButtonControlFrame::~nsHTMLButtonControlFrame()
{
}
void
nsHTMLButtonControlFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
nsContainerFrame::DestroyFrom(aDestructRoot);
}
void
nsHTMLButtonControlFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
mRenderer.SetFrame(this, PresContext());
}
NS_QUERYFRAME_HEAD(nsHTMLButtonControlFrame)
NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
#ifdef ACCESSIBILITY
a11y::AccType
nsHTMLButtonControlFrame::AccessibleType()
{
return a11y::eHTMLButtonType;
}
#endif
nsIAtom*
nsHTMLButtonControlFrame::GetType() const
{
return nsGkAtoms::HTMLButtonControlFrame;
}
void
nsHTMLButtonControlFrame::SetFocus(bool aOn, bool aRepaint)
{
}
nsresult
nsHTMLButtonControlFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
// if disabled do nothing
if (mRenderer.isDisabled()) {
return NS_OK;
}
// mouse clicks are handled by content
// we don't want our children to get any events. So just pass it to frame.
return nsFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
bool
nsHTMLButtonControlFrame::ShouldClipPaintingToBorderBox()
{
return IsInput() || StyleDisplay()->mOverflowX != NS_STYLE_OVERFLOW_VISIBLE;
}
void
nsHTMLButtonControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
// Clip to our border area for event hit testing.
Maybe<DisplayListClipState::AutoSaveRestore> eventClipState;
const bool isForEventDelivery = aBuilder->IsForEventDelivery();
if (isForEventDelivery) {
eventClipState.emplace(aBuilder);
nsRect rect(aBuilder->ToReferenceFrame(this), GetSize());
nscoord radii[8];
bool hasRadii = GetBorderRadii(radii);
eventClipState->ClipContainingBlockDescendants(rect, hasRadii ? radii : nullptr);
}
nsDisplayList onTop;
if (IsVisibleForPainting(aBuilder)) {
mRenderer.DisplayButton(aBuilder, aLists.BorderBackground(), &onTop);
}
nsDisplayListCollection set;
// Do not allow the child subtree to receive events.
if (!isForEventDelivery) {
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
if (ShouldClipPaintingToBorderBox()) {
nsMargin border = StyleBorder()->GetComputedBorder();
nsRect rect(aBuilder->ToReferenceFrame(this), GetSize());
rect.Deflate(border);
nscoord radii[8];
bool hasRadii = GetPaddingBoxBorderRadii(radii);
clipState.ClipContainingBlockDescendants(rect, hasRadii ? radii : nullptr);
}
BuildDisplayListForChild(aBuilder, mFrames.FirstChild(), aDirtyRect, set,
DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT);
// That should put the display items in set.Content()
}
// Put the foreground outline and focus rects on top of the children
set.Content()->AppendToTop(&onTop);
set.MoveTo(aLists);
DisplayOutline(aBuilder, aLists);
// to draw border when selected in editor
DisplaySelectionOverlay(aBuilder, aLists.Content());
}
nscoord
nsHTMLButtonControlFrame::GetMinISize(nsRenderingContext* aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
nsIFrame* kid = mFrames.FirstChild();
result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
kid,
nsLayoutUtils::MIN_ISIZE);
result += GetWritingMode().IsVertical()
? mRenderer.GetAddedButtonBorderAndPadding().TopBottom()
: mRenderer.GetAddedButtonBorderAndPadding().LeftRight();
return result;
}
nscoord
nsHTMLButtonControlFrame::GetPrefISize(nsRenderingContext* aRenderingContext)
{
nscoord result;
DISPLAY_PREF_WIDTH(this, result);
nsIFrame* kid = mFrames.FirstChild();
result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
kid,
nsLayoutUtils::PREF_ISIZE);
result += GetWritingMode().IsVertical()
? mRenderer.GetAddedButtonBorderAndPadding().TopBottom()
: mRenderer.GetAddedButtonBorderAndPadding().LeftRight();
return result;
}
void
nsHTMLButtonControlFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsHTMLButtonControlFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
NS_PRECONDITION(aReflowState.ComputedISize() != NS_INTRINSICSIZE,
"Should have real computed inline-size by now");
if (mState & NS_FRAME_FIRST_REFLOW) {
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), true);
}
// Reflow the child
nsIFrame* firstKid = mFrames.FirstChild();
MOZ_ASSERT(firstKid, "Button should have a child frame for its contents");
MOZ_ASSERT(!firstKid->GetNextSibling(),
"Button should have exactly one child frame");
MOZ_ASSERT(firstKid->StyleContext()->GetPseudo() ==
nsCSSAnonBoxes::buttonContent,
"Button's child frame has unexpected pseudo type!");
// XXXbz Eventually we may want to check-and-bail if
// !aReflowState.ShouldReflowAllKids() &&
// !NS_SUBTREE_DIRTY(firstKid).
// We'd need to cache our ascent for that, of course.
// Reflow the contents of the button.
// (This populates our aDesiredSize, too.)
ReflowButtonContents(aPresContext, aDesiredSize,
aReflowState, firstKid);
if (!ShouldClipPaintingToBorderBox()) {
ConsiderChildOverflow(aDesiredSize.mOverflowAreas, firstKid);
}
// else, we ignore child overflow -- anything that overflows beyond our
// own border-box will get clipped when painting.
aStatus = NS_FRAME_COMPLETE;
FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize,
aReflowState, aStatus);
// We're always complete and we don't support overflow containers
// so we shouldn't have a next-in-flow ever.
aStatus = NS_FRAME_COMPLETE;
MOZ_ASSERT(!GetNextInFlow());
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}
// Helper-function that lets us clone the button's reflow state, but with its
// ComputedWidth and ComputedHeight reduced by the amount of renderer-specific
// focus border and padding that we're using. (This lets us provide a more
// appropriate content-box size for descendents' percent sizes to resolve
// against.)
static nsHTMLReflowState
CloneReflowStateWithReducedContentBox(
const nsHTMLReflowState& aButtonReflowState,
const nsMargin& aFocusPadding)
{
nscoord adjustedWidth =
aButtonReflowState.ComputedWidth() - aFocusPadding.LeftRight();
adjustedWidth = std::max(0, adjustedWidth);
// (Only adjust height if it's an actual length.)
nscoord adjustedHeight = aButtonReflowState.ComputedHeight();
if (adjustedHeight != NS_INTRINSICSIZE) {
adjustedHeight -= aFocusPadding.TopBottom();
adjustedHeight = std::max(0, adjustedHeight);
}
nsHTMLReflowState clone(aButtonReflowState);
clone.SetComputedWidth(adjustedWidth);
clone.SetComputedHeight(adjustedHeight);
return clone;
}
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();
}
nsresult nsHTMLButtonControlFrame::SetFormProperty(nsIAtom* aName, const nsAString& aValue)
{
if (nsGkAtoms::value == aName) {
return mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::value,
aValue, true);
}
return NS_OK;
}
nsStyleContext*
nsHTMLButtonControlFrame::GetAdditionalStyleContext(int32_t aIndex) const
{
return mRenderer.GetStyleContext(aIndex);
}
void
nsHTMLButtonControlFrame::SetAdditionalStyleContext(int32_t aIndex,
nsStyleContext* aStyleContext)
{
mRenderer.SetStyleContext(aIndex, aStyleContext);
}
#ifdef DEBUG
void
nsHTMLButtonControlFrame::AppendFrames(ChildListID aListID,
nsFrameList& aFrameList)
{
MOZ_CRASH("unsupported operation");
}
void
nsHTMLButtonControlFrame::InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
MOZ_CRASH("unsupported operation");
}
void
nsHTMLButtonControlFrame::RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame)
{
MOZ_CRASH("unsupported operation");
}
#endif