gecko-dev/layout/forms/nsHTMLButtonControlFrame.cpp

402 строки
14 KiB
C++

/* -*- 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 "nsINameSpaceManager.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)
{
}
NS_IMETHODIMP
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;
}
NS_IMETHODIMP
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.GetWritingMode());
ReflowChild(aFirstKid, aPresContext,
contentsDesiredSize, contentsReflowState,
xoffset,
focusPadding.top + aButtonReflowState.ComputedPhysicalBorderPadding().top,
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 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);
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::AppendFrames(ChildListID aListID,
nsFrameList& aFrameList)
{
NS_NOTREACHED("unsupported operation");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
NS_NOTREACHED("unsupported operation");
return NS_ERROR_UNEXPECTED;
}
NS_IMETHODIMP
nsHTMLButtonControlFrame::RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame)
{
NS_NOTREACHED("unsupported operation");
return NS_ERROR_UNEXPECTED;
}