gecko-dev/layout/forms/nsMeterFrame.cpp

292 lines
9.7 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 "nsMeterFrame.h"
#include "nsIContent.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsNameSpaceManager.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsNodeInfoManager.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentUtils.h"
#include "nsFormControlFrame.h"
#include "nsFontMetrics.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLMeterElement.h"
#include "nsContentList.h"
#include "nsStyleSet.h"
#include "nsThemeConstants.h"
#include <algorithm>
using namespace mozilla;
using mozilla::dom::Element;
using mozilla::dom::HTMLMeterElement;
nsIFrame*
NS_NewMeterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMeterFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMeterFrame)
nsMeterFrame::nsMeterFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext)
, mBarDiv(nullptr)
{
}
nsMeterFrame::~nsMeterFrame()
{
}
void
nsMeterFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
NS_ASSERTION(!GetPrevContinuation(),
"nsMeterFrame should not have continuations; if it does we "
"need to call RegUnregAccessKey only for the first.");
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
nsContentUtils::DestroyAnonymousContent(&mBarDiv);
nsContainerFrame::DestroyFrom(aDestructRoot);
}
nsresult
nsMeterFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
{
// Get the NodeInfoManager and tag necessary to create the meter bar div.
nsCOMPtr<nsIDocument> doc = mContent->GetComposedDoc();
// Create the div.
mBarDiv = doc->CreateHTMLElement(nsGkAtoms::div);
// Associate ::-moz-meter-bar pseudo-element to the anonymous child.
nsCSSPseudoElements::Type pseudoType = nsCSSPseudoElements::ePseudo_mozMeterBar;
nsRefPtr<nsStyleContext> newStyleContext = PresContext()->StyleSet()->
ResolvePseudoElementStyle(mContent->AsElement(), pseudoType,
StyleContext(), mBarDiv->AsElement());
if (!aElements.AppendElement(ContentInfo(mBarDiv, newStyleContext))) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
void
nsMeterFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
uint32_t aFilter)
{
if (mBarDiv) {
aElements.AppendElement(mBarDiv);
}
}
NS_QUERYFRAME_HEAD(nsMeterFrame)
NS_QUERYFRAME_ENTRY(nsMeterFrame)
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
void
nsMeterFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsMeterFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
NS_ASSERTION(mBarDiv, "Meter bar div must exist!");
NS_ASSERTION(!GetPrevContinuation(),
"nsMeterFrame should not have continuations; if it does we "
"need to call RegUnregAccessKey only for the first.");
if (mState & NS_FRAME_FIRST_REFLOW) {
nsFormControlFrame::RegUnRegAccessKey(this, true);
}
nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();
NS_ASSERTION(barFrame, "The meter frame should have a child with a frame!");
ReflowBarFrame(barFrame, aPresContext, aReflowState, aStatus);
aDesiredSize.SetSize(aReflowState.GetWritingMode(),
aReflowState.ComputedSizeWithBorderPadding());
aDesiredSize.SetOverflowAreasToDesiredBounds();
ConsiderChildOverflow(aDesiredSize.mOverflowAreas, barFrame);
FinishAndStoreOverflow(&aDesiredSize);
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}
void
nsMeterFrame::ReflowBarFrame(nsIFrame* aBarFrame,
nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
bool vertical = ResolvedOrientationIsVertical();
WritingMode wm = aBarFrame->GetWritingMode();
LogicalSize availSize = aReflowState.ComputedSize(wm);
availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
nsHTMLReflowState reflowState(aPresContext, aReflowState,
aBarFrame, availSize);
nscoord size = vertical ? aReflowState.ComputedHeight()
: aReflowState.ComputedWidth();
nscoord xoffset = aReflowState.ComputedPhysicalBorderPadding().left;
nscoord yoffset = aReflowState.ComputedPhysicalBorderPadding().top;
// NOTE: Introduce a new function getPosition in the content part ?
HTMLMeterElement* meterElement = static_cast<HTMLMeterElement*>(mContent);
double max = meterElement->Max();
double min = meterElement->Min();
double value = meterElement->Value();
double position = max - min;
position = position != 0 ? (value - min) / position : 1;
size = NSToCoordRound(size * position);
if (!vertical && (wm.IsVertical() ? wm.IsVerticalRL() : !wm.IsBidiLTR())) {
xoffset += aReflowState.ComputedWidth() - size;
}
// The bar position is *always* constrained.
if (vertical) {
// We want the bar to begin at the bottom.
yoffset += aReflowState.ComputedHeight() - size;
size -= reflowState.ComputedPhysicalMargin().TopBottom() +
reflowState.ComputedPhysicalBorderPadding().TopBottom();
size = std::max(size, 0);
reflowState.SetComputedHeight(size);
} else {
size -= reflowState.ComputedPhysicalMargin().LeftRight() +
reflowState.ComputedPhysicalBorderPadding().LeftRight();
size = std::max(size, 0);
reflowState.SetComputedWidth(size);
}
xoffset += reflowState.ComputedPhysicalMargin().left;
yoffset += reflowState.ComputedPhysicalMargin().top;
nsHTMLReflowMetrics barDesiredSize(reflowState);
ReflowChild(aBarFrame, aPresContext, barDesiredSize, reflowState, xoffset,
yoffset, 0, aStatus);
FinishReflowChild(aBarFrame, aPresContext, barDesiredSize, &reflowState,
xoffset, yoffset, 0);
}
nsresult
nsMeterFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
NS_ASSERTION(mBarDiv, "Meter bar div must exist!");
if (aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::value ||
aAttribute == nsGkAtoms::max ||
aAttribute == nsGkAtoms::min )) {
nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();
NS_ASSERTION(barFrame, "The meter frame should have a child with a frame!");
PresContext()->PresShell()->FrameNeedsReflow(barFrame,
nsIPresShell::eResize,
NS_FRAME_IS_DIRTY);
InvalidateFrame();
}
return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
aModType);
}
LogicalSize
nsMeterFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
WritingMode aWM,
const LogicalSize& aCBSize,
nscoord aAvailableISize,
const LogicalSize& aMargin,
const LogicalSize& aBorder,
const LogicalSize& aPadding,
bool aShrinkWrap)
{
nsRefPtr<nsFontMetrics> fontMet;
NS_ENSURE_SUCCESS(nsLayoutUtils::GetFontMetricsForFrame(this,
getter_AddRefs(fontMet)),
LogicalSize(aWM));
const WritingMode wm = GetWritingMode();
LogicalSize autoSize(wm);
autoSize.BSize(wm) = autoSize.ISize(wm) = fontMet->Font().size; // 1em
if (ResolvedOrientationIsVertical() == wm.IsVertical()) {
autoSize.ISize(wm) *= 5; // 5em
} else {
autoSize.BSize(wm) *= 5; // 5em
}
return autoSize.ConvertTo(aWM, wm);
}
nscoord
nsMeterFrame::GetMinISize(nsRenderingContext *aRenderingContext)
{
nsRefPtr<nsFontMetrics> fontMet;
NS_ENSURE_SUCCESS(
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fontMet)), 0);
nscoord minISize = fontMet->Font().size; // 1em
if (ResolvedOrientationIsVertical() == GetWritingMode().IsVertical()) {
// The orientation is inline
minISize *= 5; // 5em
}
return minISize;
}
nscoord
nsMeterFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
{
return GetMinISize(aRenderingContext);
}
bool
nsMeterFrame::ShouldUseNativeStyle() const
{
nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();
// Use the native style if these conditions are satisfied:
// - both frames use the native appearance;
// - neither frame has author specified rules setting the border or the
// background.
return StyleDisplay()->mAppearance == NS_THEME_METERBAR &&
!PresContext()->HasAuthorSpecifiedRules(this,
NS_AUTHOR_SPECIFIED_BORDER | NS_AUTHOR_SPECIFIED_BACKGROUND) &&
barFrame &&
barFrame->StyleDisplay()->mAppearance == NS_THEME_METERBAR_CHUNK &&
!PresContext()->HasAuthorSpecifiedRules(barFrame,
NS_AUTHOR_SPECIFIED_BORDER | NS_AUTHOR_SPECIFIED_BACKGROUND);
}
Element*
nsMeterFrame::GetPseudoElement(nsCSSPseudoElements::Type aType)
{
if (aType == nsCSSPseudoElements::ePseudo_mozMeterBar) {
return mBarDiv;
}
return nsContainerFrame::GetPseudoElement(aType);
}