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-rw-r--r--layout/forms/nsHTMLButtonControlFrame.cpp465
1 files changed, 465 insertions, 0 deletions
diff --git a/layout/forms/nsHTMLButtonControlFrame.cpp b/layout/forms/nsHTMLButtonControlFrame.cpp
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+++ b/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,
+ ReflowOutput& aDesiredSize,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus)
+{
+ MarkInReflow();
+ DO_GLOBAL_REFLOW_COUNT("nsHTMLButtonControlFrame");
+ DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
+
+ NS_PRECONDITION(aReflowInput.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
+ // !aReflowInput.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,
+ aReflowInput, 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,
+ aReflowInput, 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, aReflowInput, 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 ReflowInput
+CloneReflowInputWithReducedContentBox(
+ const ReflowInput& aButtonReflowInput,
+ const nsMargin& aFocusPadding)
+{
+ nscoord adjustedWidth =
+ aButtonReflowInput.ComputedWidth() - aFocusPadding.LeftRight();
+ adjustedWidth = std::max(0, adjustedWidth);
+
+ // (Only adjust height if it's an actual length.)
+ nscoord adjustedHeight = aButtonReflowInput.ComputedHeight();
+ if (adjustedHeight != NS_INTRINSICSIZE) {
+ adjustedHeight -= aFocusPadding.TopBottom();
+ adjustedHeight = std::max(0, adjustedHeight);
+ }
+
+ ReflowInput clone(aButtonReflowInput);
+ clone.SetComputedWidth(adjustedWidth);
+ clone.SetComputedHeight(adjustedHeight);
+
+ return clone;
+}
+
+void
+nsHTMLButtonControlFrame::ReflowButtonContents(nsPresContext* aPresContext,
+ ReflowOutput& aButtonDesiredSize,
+ const ReflowInput& aButtonReflowInput,
+ nsIFrame* aFirstKid)
+{
+ WritingMode wm = GetWritingMode();
+ LogicalSize availSize = aButtonReflowInput.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(aButtonReflowInput.mRenderingContext) -
+ aButtonReflowInput.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 = aButtonReflowInput.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.
+ ReflowInput adjustedButtonReflowInput =
+ CloneReflowInputWithReducedContentBox(aButtonReflowInput,
+ focusPadding.GetPhysicalMargin(wm));
+
+ ReflowInput contentsReflowInput(aPresContext,
+ adjustedButtonReflowInput,
+ aFirstKid, availSize);
+
+ nsReflowStatus contentsReflowStatus;
+ ReflowOutput contentsDesiredSize(aButtonReflowInput);
+ 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, contentsReflowInput,
+ 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 (aButtonReflowInput.ComputedBSize() != NS_INTRINSICSIZE) {
+ // Button has a fixed block-size -- that's its content-box bSize.
+ buttonContentBox.BSize(wm) = aButtonReflowInput.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
+ // aButtonReflowInput.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),
+ aButtonReflowInput.ComputedMinBSize(),
+ aButtonReflowInput.ComputedMaxBSize());
+ }
+ if (aButtonReflowInput.ComputedISize() != NS_INTRINSICSIZE) {
+ buttonContentBox.ISize(wm) = aButtonReflowInput.ComputedISize();
+ } else {
+ buttonContentBox.ISize(wm) =
+ contentsDesiredSize.ISize(wm) + focusPadding.IStartEnd(wm);
+ buttonContentBox.ISize(wm) =
+ NS_CSS_MINMAX(buttonContentBox.ISize(wm),
+ aButtonReflowInput.ComputedMinISize(),
+ aButtonReflowInput.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, &contentsReflowInput,
+ wm, childPos, containerSize, 0);
+
+ // Make sure we have a useful 'ascent' value for the child
+ if (contentsDesiredSize.BlockStartAscent() ==
+ ReflowOutput::ASK_FOR_BASELINE) {
+ WritingMode wm = aButtonReflowInput.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, aButtonReflowInput.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