The Tor Browser: layout/forms/nsHTMLButtonControlFrame.cpp@6474c204b198 (annotated)

layout/forms/nsHTMLButtonControlFrame.cpp@6474c204b198 (annotated)

layout/forms/nsHTMLButtonControlFrame.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- 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 "nsStyleSet.h"
 #include "nsDisplayList.h"
 #include <algorithm>
 using namespace mozilla;
 nsIFrame*
 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,
               nsIFrame*        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);
 }
 void
 nsHTMLButtonControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                            const nsRect&           aDirtyRect,
                                            const nsDisplayListSet& aLists)
 {
   nsDisplayList onTop;
   if (IsVisibleForPainting(aBuilder)) {
     mRenderer.DisplayButton(aBuilder, aLists.BorderBackground(), &onTop);
   }
   nsDisplayListCollection set;
   // Do not allow the child subtree to receive events.
   if (!aBuilder->IsForEventDelivery()) {
     DisplayListClipState::AutoSaveRestore clipState(aBuilder);
     if (IsInput() || StyleDisplay()->mOverflowX != NS_STYLE_OVERFLOW_VISIBLE) {
       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::GetMinWidth(nsRenderingContext* aRenderingContext)
 {
   nscoord result;
   DISPLAY_MIN_WIDTH(this, result);
   nsIFrame* kid = mFrames.FirstChild();
   result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
                                                 kid,
                                                 nsLayoutUtils::MIN_WIDTH);
   result += mRenderer.GetAddedButtonBorderAndPadding().LeftRight();
   return result;
 }
 nscoord
 nsHTMLButtonControlFrame::GetPrefWidth(nsRenderingContext* aRenderingContext)
 {
   nscoord result;
   DISPLAY_PREF_WIDTH(this, result);
   nsIFrame* kid = mFrames.FirstChild();
   result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
                                                 kid,
                                                 nsLayoutUtils::PREF_WIDTH);
   result += mRenderer.GetAddedButtonBorderAndPadding().LeftRight();
   return result;
 }
 nsresult
 nsHTMLButtonControlFrame::Reflow(nsPresContext* aPresContext,
                                nsHTMLReflowMetrics& aDesiredSize,
                                const nsHTMLReflowState& aReflowState,
                                nsReflowStatus& aStatus)
 {
   DO_GLOBAL_REFLOW_COUNT("nsHTMLButtonControlFrame");
   DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
   NS_PRECONDITION(aReflowState.ComputedWidth() != NS_INTRINSICSIZE,
                   "Should have real computed width 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);
   ConsiderChildOverflow(aDesiredSize.mOverflowAreas, firstKid);
   aStatus = NS_FRAME_COMPLETE;
   FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize,
                                  aReflowState, aStatus);
   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
   return NS_OK;
 }
 // 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)
 {
   // Buttons have some bonus renderer-determined border/padding,
   // which occupies part of the button's content-box area:
   const nsMargin focusPadding = mRenderer.GetAddedButtonBorderAndPadding();
   nsSize availSize(aButtonReflowState.ComputedWidth(), NS_INTRINSICSIZE);
   // Indent the child inside us by the focus border. We must do this separate
   // from the regular border.
   availSize.width -= focusPadding.LeftRight();
   // See whether out availSize's width is big enough.  If it's smaller than our
   // intrinsic min width, that means that the kid wouldn't really fit; for a
   // better look in such cases we adjust the available width and our left
   // offset to allow the kid to spill left into our padding.
   nscoord xoffset = focusPadding.left +
     aButtonReflowState.ComputedPhysicalBorderPadding().left;
   nscoord extrawidth = GetMinWidth(aButtonReflowState.rendContext) -
     aButtonReflowState.ComputedWidth();
   if (extrawidth > 0) {
     nscoord extraleft = extrawidth / 2;
     nscoord extraright = extrawidth - extraleft;
     NS_ASSERTION(extraright >=0, "How'd that happen?");
     // Do not allow the extras to be bigger than the relevant padding
     extraleft = std::min(extraleft, aButtonReflowState.ComputedPhysicalPadding().left);
     extraright = std::min(extraright, aButtonReflowState.ComputedPhysicalPadding().right);
     xoffset -= extraleft;
     availSize.width += extraleft + extraright;
   }
   availSize.width = std::max(availSize.width,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);
   nsHTMLReflowState contentsReflowState(aPresContext,
                                         adjustedButtonReflowState,
                                         aFirstKid, availSize);
   nsReflowStatus contentsReflowStatus;
   nsHTMLReflowMetrics contentsDesiredSize(aButtonReflowState);
   ReflowChild(aFirstKid, aPresContext,
               contentsDesiredSize, contentsReflowState,
               xoffset,
               focusPadding.top + aButtonReflowState.ComputedPhysicalBorderPadding().top,
 , 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 height:
   nscoord buttonContentBoxHeight = 0;
   if (aButtonReflowState.ComputedHeight() != NS_INTRINSICSIZE) {
     // Button has a fixed height -- that's its content-box height.
     buttonContentBoxHeight = aButtonReflowState.ComputedHeight();
   } else {
     // Button is intrinsically sized -- it should shrinkwrap the
     // button-contents' height, plus any focus-padding space:
     buttonContentBoxHeight =
       contentsDesiredSize.Height() + focusPadding.TopBottom();
     // Make sure we obey min/max-height in the case when we're doing intrinsic
     // sizing (we get it for free when we have a non-intrinsic
     // aButtonReflowState.ComputedHeight()).  Note that we do this before
     // adjusting for borderpadding, since mComputedMaxHeight and
     // mComputedMinHeight are content heights.
     buttonContentBoxHeight =
       NS_CSS_MINMAX(buttonContentBoxHeight,
                     aButtonReflowState.ComputedMinHeight(),
                     aButtonReflowState.ComputedMaxHeight());
   }
   // Center child vertically in the button
   // (technically, inside of the button's focus-padding area)
   nscoord extraSpace =
     buttonContentBoxHeight - focusPadding.TopBottom() -
     contentsDesiredSize.Height();
   nscoord yoffset = std::max(0, extraSpace / 2);
   // Adjust yoffset to be in terms of the button's frame-rect, instead of
   // its focus-padding rect:
   yoffset += focusPadding.top + aButtonReflowState.ComputedPhysicalBorderPadding().top;
   // Place the child
   FinishReflowChild(aFirstKid, aPresContext,
                     contentsDesiredSize, &contentsReflowState,
                     xoffset, yoffset, 0);
   // Make sure we have a useful 'ascent' value for the child
   if (contentsDesiredSize.TopAscent() == nsHTMLReflowMetrics::ASK_FOR_BASELINE) {
     contentsDesiredSize.SetTopAscent(aFirstKid->GetBaseline());
   }
   // 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.Width() = aButtonReflowState.ComputedWidth() +
     aButtonReflowState.ComputedPhysicalBorderPadding().LeftRight();
   aButtonDesiredSize.Height() = buttonContentBoxHeight +
     aButtonReflowState.ComputedPhysicalBorderPadding().TopBottom();
   //  * Button's ascent is its child's ascent, plus the child's y-offset
   // within our frame:
   aButtonDesiredSize.SetTopAscent(contentsDesiredSize.TopAscent() + yoffset);
   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);
 }
 nsresult
 nsHTMLButtonControlFrame::AppendFrames(ChildListID     aListID,
                                        nsFrameList&    aFrameList)
 {
   NS_NOTREACHED("unsupported operation");
   return NS_ERROR_UNEXPECTED;
 }
 nsresult
 nsHTMLButtonControlFrame::InsertFrames(ChildListID     aListID,
                                        nsIFrame*       aPrevFrame,
                                        nsFrameList&    aFrameList)
 {
   NS_NOTREACHED("unsupported operation");
   return NS_ERROR_UNEXPECTED;
 }
 nsresult
 nsHTMLButtonControlFrame::RemoveFrame(ChildListID     aListID,
                                       nsIFrame*       aOldFrame)
 {
   NS_NOTREACHED("unsupported operation");
   return NS_ERROR_UNEXPECTED;
 }

The Tor Browser / annotate

layout/forms/nsHTMLButtonControlFrame.cpp@6474c204b198 (annotated)

layout/forms/nsHTMLButtonControlFrame.cpp