1 files changed, 465 insertions, 0 deletions
diff --git a/layout/forms/nsHTMLButtonControlFrame.cpp b/layout/forms/nsHTMLButtonControlFrame.cpp
new file mode 100644
index 000000000..ef9459ef2
--- /dev/null
+++ b/layout/forms/nsHTMLButtonControlFrame.cpp
@@ -0,0 +1,465 @@
+/* -*- 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