gecko/layout/forms/nsMeterFrame.cpp
2012-06-10 19:44:50 -04:00

280 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 "nsIDOMHTMLMeterElement.h"
#include "nsIContent.h"
#include "prtypes.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsINameSpaceManager.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsNodeInfoManager.h"
#include "nsINodeInfo.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentUtils.h"
#include "nsFormControlFrame.h"
#include "nsFontMetrics.h"
#include "mozilla/dom/Element.h"
nsIFrame*
NS_NewMeterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMeterFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMeterFrame)
nsMeterFrame::nsMeterFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext)
, mBarDiv(nsnull)
{
}
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->GetDocument();
nsCOMPtr<nsINodeInfo> nodeInfo;
nodeInfo = doc->NodeInfoManager()->GetNodeInfo(nsGkAtoms::div, nsnull,
kNameSpaceID_XHTML,
nsIDOMNode::ELEMENT_NODE);
NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);
// Create the div.
nsresult rv = NS_NewHTMLElement(getter_AddRefs(mBarDiv), nodeInfo.forget(),
mozilla::dom::NOT_FROM_PARSER);
NS_ENSURE_SUCCESS(rv, rv);
// 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,
GetStyleContext());
if (!aElements.AppendElement(ContentInfo(mBarDiv, newStyleContext))) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
void
nsMeterFrame::AppendAnonymousContentTo(nsBaseContentList& aElements,
PRUint32 aFilter)
{
aElements.MaybeAppendElement(mBarDiv);
}
NS_QUERYFRAME_HEAD(nsMeterFrame)
NS_QUERYFRAME_ENTRY(nsMeterFrame)
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
NS_IMETHODIMP nsMeterFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
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.width = aReflowState.ComputedWidth() +
aReflowState.mComputedBorderPadding.LeftRight();
aDesiredSize.height = aReflowState.ComputedHeight() +
aReflowState.mComputedBorderPadding.TopBottom();
aDesiredSize.height = NS_CSS_MINMAX(aDesiredSize.height,
aReflowState.mComputedMinHeight,
aReflowState.mComputedMaxHeight);
aDesiredSize.SetOverflowAreasToDesiredBounds();
ConsiderChildOverflow(aDesiredSize.mOverflowAreas, barFrame);
FinishAndStoreOverflow(&aDesiredSize);
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return NS_OK;
}
void
nsMeterFrame::ReflowBarFrame(nsIFrame* aBarFrame,
nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
bool vertical = GetStyleDisplay()->mOrient == NS_STYLE_ORIENT_VERTICAL;
nsHTMLReflowState reflowState(aPresContext, aReflowState, aBarFrame,
nsSize(aReflowState.ComputedWidth(),
NS_UNCONSTRAINEDSIZE));
nscoord size = vertical ? aReflowState.ComputedHeight()
: aReflowState.ComputedWidth();
nscoord xoffset = aReflowState.mComputedBorderPadding.left;
nscoord yoffset = aReflowState.mComputedBorderPadding.top;
// NOTE: Introduce a new function getPosition in the content part ?
double position, max, min, value;
nsCOMPtr<nsIDOMHTMLMeterElement> meterElement =
do_QueryInterface(mContent);
meterElement->GetMax(&max);
meterElement->GetMin(&min);
meterElement->GetValue(&value);
position = max - min;
position = position != 0 ? (value - min) / position : 1;
size = NSToCoordRound(size * position);
if (!vertical && GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
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.mComputedMargin.TopBottom() +
reflowState.mComputedBorderPadding.TopBottom();
size = NS_MAX(size, 0);
reflowState.SetComputedHeight(size);
} else {
size -= reflowState.mComputedMargin.LeftRight() +
reflowState.mComputedBorderPadding.LeftRight();
size = NS_MAX(size, 0);
reflowState.SetComputedWidth(size);
}
xoffset += reflowState.mComputedMargin.left;
yoffset += reflowState.mComputedMargin.top;
nsHTMLReflowMetrics barDesiredSize;
ReflowChild(aBarFrame, aPresContext, barDesiredSize, reflowState, xoffset,
yoffset, 0, aStatus);
FinishReflowChild(aBarFrame, aPresContext, &reflowState, barDesiredSize,
xoffset, yoffset, 0);
}
NS_IMETHODIMP
nsMeterFrame::AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 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);
Invalidate(GetVisualOverflowRectRelativeToSelf());
}
return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
aModType);
}
nsSize
nsMeterFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder,
nsSize aPadding, bool aShrinkWrap)
{
nsRefPtr<nsFontMetrics> fontMet;
NS_ENSURE_SUCCESS(nsLayoutUtils::GetFontMetricsForFrame(this,
getter_AddRefs(fontMet)),
nsSize(0, 0));
nsSize autoSize;
autoSize.height = autoSize.width = fontMet->Font().size; // 1em
if (GetStyleDisplay()->mOrient == NS_STYLE_ORIENT_VERTICAL) {
autoSize.height *= 5; // 5em
} else {
autoSize.width *= 5; // 5em
}
return autoSize;
}
nscoord
nsMeterFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
{
nsRefPtr<nsFontMetrics> fontMet;
NS_ENSURE_SUCCESS(
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fontMet)), 0);
nscoord minWidth = fontMet->Font().size; // 1em
if (GetStyleDisplay()->mOrient == NS_STYLE_ORIENT_HORIZONTAL) {
minWidth *= 5; // 5em
}
return minWidth;
}
nscoord
nsMeterFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
{
return GetMinWidth(aRenderingContext);
}
bool
nsMeterFrame::ShouldUseNativeStyle() const
{
// 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 GetStyleDisplay()->mAppearance == NS_THEME_METERBAR &&
mBarDiv->GetPrimaryFrame()->GetStyleDisplay()->mAppearance == NS_THEME_METERBAR_CHUNK &&
!PresContext()->HasAuthorSpecifiedRules(const_cast<nsMeterFrame*>(this),
NS_AUTHOR_SPECIFIED_BORDER | NS_AUTHOR_SPECIFIED_BACKGROUND) &&
!PresContext()->HasAuthorSpecifiedRules(mBarDiv->GetPrimaryFrame(),
NS_AUTHOR_SPECIFIED_BORDER | NS_AUTHOR_SPECIFIED_BACKGROUND);
}