michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsMeterFrame.h"
michael@0: 
michael@0: #include "nsIContent.h"
michael@0: #include "nsPresContext.h"
michael@0: #include "nsGkAtoms.h"
michael@0: #include "nsNameSpaceManager.h"
michael@0: #include "nsIDocument.h"
michael@0: #include "nsIPresShell.h"
michael@0: #include "nsNodeInfoManager.h"
michael@0: #include "nsINodeInfo.h"
michael@0: #include "nsContentCreatorFunctions.h"
michael@0: #include "nsContentUtils.h"
michael@0: #include "nsFormControlFrame.h"
michael@0: #include "nsFontMetrics.h"
michael@0: #include "mozilla/dom/Element.h"
michael@0: #include "mozilla/dom/HTMLMeterElement.h"
michael@0: #include "nsContentList.h"
michael@0: #include "nsStyleSet.h"
michael@0: #include "nsThemeConstants.h"
michael@0: #include <algorithm>
michael@0: 
michael@0: using mozilla::dom::Element;
michael@0: using mozilla::dom::HTMLMeterElement;
michael@0: 
michael@0: nsIFrame*
michael@0: NS_NewMeterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
michael@0: {
michael@0:   return new (aPresShell) nsMeterFrame(aContext);
michael@0: }
michael@0: 
michael@0: NS_IMPL_FRAMEARENA_HELPERS(nsMeterFrame)
michael@0: 
michael@0: nsMeterFrame::nsMeterFrame(nsStyleContext* aContext)
michael@0:   : nsContainerFrame(aContext)
michael@0:   , mBarDiv(nullptr)
michael@0: {
michael@0: }
michael@0: 
michael@0: nsMeterFrame::~nsMeterFrame()
michael@0: {
michael@0: }
michael@0: 
michael@0: void
michael@0: nsMeterFrame::DestroyFrom(nsIFrame* aDestructRoot)
michael@0: {
michael@0:   NS_ASSERTION(!GetPrevContinuation(),
michael@0:                "nsMeterFrame should not have continuations; if it does we "
michael@0:                "need to call RegUnregAccessKey only for the first.");
michael@0:   nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
michael@0:   nsContentUtils::DestroyAnonymousContent(&mBarDiv);
michael@0:   nsContainerFrame::DestroyFrom(aDestructRoot);
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsMeterFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
michael@0: {
michael@0:   // Get the NodeInfoManager and tag necessary to create the meter bar div.
michael@0:   nsCOMPtr<nsIDocument> doc = mContent->GetDocument();
michael@0: 
michael@0:   // Create the div.
michael@0:   mBarDiv = doc->CreateHTMLElement(nsGkAtoms::div);
michael@0: 
michael@0:   // Associate ::-moz-meter-bar pseudo-element to the anonymous child.
michael@0:   nsCSSPseudoElements::Type pseudoType = nsCSSPseudoElements::ePseudo_mozMeterBar;
michael@0:   nsRefPtr<nsStyleContext> newStyleContext = PresContext()->StyleSet()->
michael@0:     ResolvePseudoElementStyle(mContent->AsElement(), pseudoType,
michael@0:                               StyleContext(), mBarDiv->AsElement());
michael@0: 
michael@0:   if (!aElements.AppendElement(ContentInfo(mBarDiv, newStyleContext))) {
michael@0:     return NS_ERROR_OUT_OF_MEMORY;
michael@0:   }
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsMeterFrame::AppendAnonymousContentTo(nsBaseContentList& aElements,
michael@0:                                        uint32_t aFilter)
michael@0: {
michael@0:   aElements.MaybeAppendElement(mBarDiv);
michael@0: }
michael@0: 
michael@0: NS_QUERYFRAME_HEAD(nsMeterFrame)
michael@0:   NS_QUERYFRAME_ENTRY(nsMeterFrame)
michael@0:   NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
michael@0: NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
michael@0: 
michael@0: 
michael@0: nsresult nsMeterFrame::Reflow(nsPresContext*           aPresContext,
michael@0:                                    nsHTMLReflowMetrics&     aDesiredSize,
michael@0:                                    const nsHTMLReflowState& aReflowState,
michael@0:                                    nsReflowStatus&          aStatus)
michael@0: {
michael@0:   DO_GLOBAL_REFLOW_COUNT("nsMeterFrame");
michael@0:   DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
michael@0: 
michael@0:   NS_ASSERTION(mBarDiv, "Meter bar div must exist!");
michael@0:   NS_ASSERTION(!GetPrevContinuation(),
michael@0:                "nsMeterFrame should not have continuations; if it does we "
michael@0:                "need to call RegUnregAccessKey only for the first.");
michael@0: 
michael@0:   if (mState & NS_FRAME_FIRST_REFLOW) {
michael@0:     nsFormControlFrame::RegUnRegAccessKey(this, true);
michael@0:   }
michael@0: 
michael@0:   nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();
michael@0:   NS_ASSERTION(barFrame, "The meter frame should have a child with a frame!");
michael@0: 
michael@0:   ReflowBarFrame(barFrame, aPresContext, aReflowState, aStatus);
michael@0: 
michael@0:   aDesiredSize.Width() = aReflowState.ComputedWidth() +
michael@0:                        aReflowState.ComputedPhysicalBorderPadding().LeftRight();
michael@0:   aDesiredSize.Height() = aReflowState.ComputedHeight() +
michael@0:                         aReflowState.ComputedPhysicalBorderPadding().TopBottom();
michael@0: 
michael@0:   aDesiredSize.SetOverflowAreasToDesiredBounds();
michael@0:   ConsiderChildOverflow(aDesiredSize.mOverflowAreas, barFrame);
michael@0:   FinishAndStoreOverflow(&aDesiredSize);
michael@0: 
michael@0:   aStatus = NS_FRAME_COMPLETE;
michael@0: 
michael@0:   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsMeterFrame::ReflowBarFrame(nsIFrame*                aBarFrame,
michael@0:                              nsPresContext*           aPresContext,
michael@0:                              const nsHTMLReflowState& aReflowState,
michael@0:                              nsReflowStatus&          aStatus)
michael@0: {
michael@0:   bool vertical = StyleDisplay()->mOrient == NS_STYLE_ORIENT_VERTICAL;
michael@0:   nsHTMLReflowState reflowState(aPresContext, aReflowState, aBarFrame,
michael@0:                                 nsSize(aReflowState.ComputedWidth(),
michael@0:                                        NS_UNCONSTRAINEDSIZE));
michael@0:   nscoord size = vertical ? aReflowState.ComputedHeight()
michael@0:                           : aReflowState.ComputedWidth();
michael@0:   nscoord xoffset = aReflowState.ComputedPhysicalBorderPadding().left;
michael@0:   nscoord yoffset = aReflowState.ComputedPhysicalBorderPadding().top;
michael@0: 
michael@0:   // NOTE: Introduce a new function getPosition in the content part ?
michael@0:   HTMLMeterElement* meterElement = static_cast<HTMLMeterElement*>(mContent);
michael@0: 
michael@0:   double max = meterElement->Max();
michael@0:   double min = meterElement->Min();
michael@0:   double value = meterElement->Value();
michael@0: 
michael@0:   double position = max - min;
michael@0:   position = position != 0 ? (value - min) / position : 1;
michael@0: 
michael@0:   size = NSToCoordRound(size * position);
michael@0: 
michael@0:   if (!vertical && StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
michael@0:     xoffset += aReflowState.ComputedWidth() - size;
michael@0:   }
michael@0: 
michael@0:   // The bar position is *always* constrained.
michael@0:   if (vertical) {
michael@0:     // We want the bar to begin at the bottom.
michael@0:     yoffset += aReflowState.ComputedHeight() - size;
michael@0: 
michael@0:     size -= reflowState.ComputedPhysicalMargin().TopBottom() +
michael@0:             reflowState.ComputedPhysicalBorderPadding().TopBottom();
michael@0:     size = std::max(size, 0);
michael@0:     reflowState.SetComputedHeight(size);
michael@0:   } else {
michael@0:     size -= reflowState.ComputedPhysicalMargin().LeftRight() +
michael@0:             reflowState.ComputedPhysicalBorderPadding().LeftRight();
michael@0:     size = std::max(size, 0);
michael@0:     reflowState.SetComputedWidth(size);
michael@0:   }
michael@0: 
michael@0:   xoffset += reflowState.ComputedPhysicalMargin().left;
michael@0:   yoffset += reflowState.ComputedPhysicalMargin().top;
michael@0: 
michael@0:   nsHTMLReflowMetrics barDesiredSize(reflowState);
michael@0:   ReflowChild(aBarFrame, aPresContext, barDesiredSize, reflowState, xoffset,
michael@0:               yoffset, 0, aStatus);
michael@0:   FinishReflowChild(aBarFrame, aPresContext, barDesiredSize, &reflowState,
michael@0:                     xoffset, yoffset, 0);
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsMeterFrame::AttributeChanged(int32_t  aNameSpaceID,
michael@0:                                nsIAtom* aAttribute,
michael@0:                                int32_t  aModType)
michael@0: {
michael@0:   NS_ASSERTION(mBarDiv, "Meter bar div must exist!");
michael@0: 
michael@0:   if (aNameSpaceID == kNameSpaceID_None &&
michael@0:       (aAttribute == nsGkAtoms::value ||
michael@0:        aAttribute == nsGkAtoms::max   ||
michael@0:        aAttribute == nsGkAtoms::min )) {
michael@0:     nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();
michael@0:     NS_ASSERTION(barFrame, "The meter frame should have a child with a frame!");
michael@0:     PresContext()->PresShell()->FrameNeedsReflow(barFrame,
michael@0:                                                  nsIPresShell::eResize,
michael@0:                                                  NS_FRAME_IS_DIRTY);
michael@0:     InvalidateFrame();
michael@0:   }
michael@0: 
michael@0:   return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
michael@0:                                             aModType);
michael@0: }
michael@0: 
michael@0: nsSize
michael@0: nsMeterFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
michael@0:                               nsSize aCBSize, nscoord aAvailableWidth,
michael@0:                               nsSize aMargin, nsSize aBorder,
michael@0:                               nsSize aPadding, bool aShrinkWrap)
michael@0: {
michael@0:   nsRefPtr<nsFontMetrics> fontMet;
michael@0:   NS_ENSURE_SUCCESS(nsLayoutUtils::GetFontMetricsForFrame(this,
michael@0:                                                           getter_AddRefs(fontMet)),
michael@0:                     nsSize(0, 0));
michael@0: 
michael@0:   nsSize autoSize;
michael@0:   autoSize.height = autoSize.width = fontMet->Font().size; // 1em
michael@0: 
michael@0:   if (StyleDisplay()->mOrient == NS_STYLE_ORIENT_VERTICAL) {
michael@0:     autoSize.height *= 5; // 5em
michael@0:   } else {
michael@0:     autoSize.width *= 5; // 5em
michael@0:   }
michael@0: 
michael@0:   return autoSize;
michael@0: }
michael@0: 
michael@0: nscoord
michael@0: nsMeterFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
michael@0: {
michael@0:   nsRefPtr<nsFontMetrics> fontMet;
michael@0:   NS_ENSURE_SUCCESS(
michael@0:       nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fontMet)), 0);
michael@0: 
michael@0:   nscoord minWidth = fontMet->Font().size; // 1em
michael@0: 
michael@0:   if (StyleDisplay()->mOrient == NS_STYLE_ORIENT_AUTO ||
michael@0:       StyleDisplay()->mOrient == NS_STYLE_ORIENT_HORIZONTAL) {
michael@0:     // The orientation is horizontal
michael@0:     minWidth *= 5; // 5em
michael@0:   }
michael@0: 
michael@0:   return minWidth;
michael@0: }
michael@0: 
michael@0: nscoord
michael@0: nsMeterFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
michael@0: {
michael@0:   return GetMinWidth(aRenderingContext);
michael@0: }
michael@0: 
michael@0: bool
michael@0: nsMeterFrame::ShouldUseNativeStyle() const
michael@0: {
michael@0:   // Use the native style if these conditions are satisfied:
michael@0:   // - both frames use the native appearance;
michael@0:   // - neither frame has author specified rules setting the border or the
michael@0:   //   background.
michael@0:   return StyleDisplay()->mAppearance == NS_THEME_METERBAR &&
michael@0:          mBarDiv->GetPrimaryFrame()->StyleDisplay()->mAppearance == NS_THEME_METERBAR_CHUNK &&
michael@0:          !PresContext()->HasAuthorSpecifiedRules(const_cast<nsMeterFrame*>(this),
michael@0:                                                  NS_AUTHOR_SPECIFIED_BORDER | NS_AUTHOR_SPECIFIED_BACKGROUND) &&
michael@0:          !PresContext()->HasAuthorSpecifiedRules(mBarDiv->GetPrimaryFrame(),
michael@0:                                                  NS_AUTHOR_SPECIFIED_BORDER | NS_AUTHOR_SPECIFIED_BACKGROUND);
michael@0: }
michael@0: 
michael@0: Element*
michael@0: nsMeterFrame::GetPseudoElement(nsCSSPseudoElements::Type aType)
michael@0: {
michael@0:   if (aType == nsCSSPseudoElements::ePseudo_mozMeterBar) {
michael@0:     return mBarDiv;
michael@0:   }
michael@0: 
michael@0:   return nsContainerFrame::GetPseudoElement(aType);
michael@0: }