1 files changed, 222 insertions, 0 deletions
diff --git a/layout/forms/nsMeterFrame.cpp b/layout/forms/nsMeterFrame.cpp
new file mode 100644
index 0000000000..76e569226c
--- /dev/null
+++ b/layout/forms/nsMeterFrame.cpp
@@ -0,0 +1,222 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "mozilla/PresShell.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/HTMLMeterElement.h"
+#include "nsIContent.h"
+#include "nsLayoutUtils.h"
+#include "nsPresContext.h"
+#include "nsGkAtoms.h"
+#include "nsNameSpaceManager.h"
+#include "nsNodeInfoManager.h"
+#include "nsContentCreatorFunctions.h"
+#include "nsFontMetrics.h"
+#include "nsCSSPseudoElements.h"
+#include "nsStyleConsts.h"
+#include <algorithm>
+
+using namespace mozilla;
+using mozilla::dom::Document;
+using mozilla::dom::Element;
+using mozilla::dom::HTMLMeterElement;
+
+nsIFrame* NS_NewMeterFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
+  return new (aPresShell) nsMeterFrame(aStyle, aPresShell->GetPresContext());
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsMeterFrame)
+
+nsMeterFrame::nsMeterFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+    : nsContainerFrame(aStyle, aPresContext, kClassID), mBarDiv(nullptr) {}
+
+nsMeterFrame::~nsMeterFrame() = default;
+
+void nsMeterFrame::Destroy(DestroyContext& aContext) {
+  NS_ASSERTION(!GetPrevContinuation(),
+               "nsMeterFrame should not have continuations; if it does we "
+               "need to call RegUnregAccessKey only for the first.");
+  aContext.AddAnonymousContent(mBarDiv.forget());
+  nsContainerFrame::Destroy(aContext);
+}
+
+nsresult nsMeterFrame::CreateAnonymousContent(
+    nsTArray<ContentInfo>& aElements) {
+  // Get the NodeInfoManager and tag necessary to create the meter bar div.
+  nsCOMPtr<Document> doc = mContent->GetComposedDoc();
+
+  // Create the div.
+  mBarDiv = doc->CreateHTMLElement(nsGkAtoms::div);
+
+  // Associate ::-moz-meter-bar pseudo-element to the anonymous child.
+  mBarDiv->SetPseudoElementType(PseudoStyleType::mozMeterBar);
+
+  aElements.AppendElement(mBarDiv);
+
+  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,
+                          ReflowOutput& aDesiredSize,
+                          const ReflowInput& aReflowInput,
+                          nsReflowStatus& aStatus) {
+  MarkInReflow();
+  DO_GLOBAL_REFLOW_COUNT("nsMeterFrame");
+  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
+  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
+
+  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.");
+
+  nsIFrame* barFrame = mBarDiv->GetPrimaryFrame();
+  NS_ASSERTION(barFrame, "The meter frame should have a child with a frame!");
+
+  ReflowBarFrame(barFrame, aPresContext, aReflowInput, aStatus);
+
+  const auto wm = aReflowInput.GetWritingMode();
+  aDesiredSize.SetSize(wm, aReflowInput.ComputedSizeWithBorderPadding(wm));
+
+  aDesiredSize.SetOverflowAreasToDesiredBounds();
+  ConsiderChildOverflow(aDesiredSize.mOverflowAreas, barFrame);
+  FinishAndStoreOverflow(&aDesiredSize);
+
+  aStatus.Reset();  // This type of frame can't be split.
+}
+
+void nsMeterFrame::ReflowBarFrame(nsIFrame* aBarFrame,
+                                  nsPresContext* aPresContext,
+                                  const ReflowInput& aReflowInput,
+                                  nsReflowStatus& aStatus) {
+  bool vertical = ResolvedOrientationIsVertical();
+  WritingMode wm = aBarFrame->GetWritingMode();
+  LogicalSize availSize = aReflowInput.ComputedSize(wm);
+  availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
+  ReflowInput reflowInput(aPresContext, aReflowInput, aBarFrame, availSize);
+  nscoord size =
+      vertical ? aReflowInput.ComputedHeight() : aReflowInput.ComputedWidth();
+  nscoord xoffset = aReflowInput.ComputedPhysicalBorderPadding().left;
+  nscoord yoffset = aReflowInput.ComputedPhysicalBorderPadding().top;
+
+  auto* meterElement = static_cast<HTMLMeterElement*>(GetContent());
+  size = NSToCoordRound(size * meterElement->Position());
+
+  if (!vertical && wm.IsPhysicalRTL()) {
+    xoffset += aReflowInput.ComputedWidth() - size;
+  }
+
+  // The bar position is *always* constrained.
+  if (vertical) {
+    // We want the bar to begin at the bottom.
+    yoffset += aReflowInput.ComputedHeight() - size;
+
+    size -= reflowInput.ComputedPhysicalMargin().TopBottom() +
+            reflowInput.ComputedPhysicalBorderPadding().TopBottom();
+    size = std::max(size, 0);
+    reflowInput.SetComputedHeight(size);
+  } else {
+    size -= reflowInput.ComputedPhysicalMargin().LeftRight() +
+            reflowInput.ComputedPhysicalBorderPadding().LeftRight();
+    size = std::max(size, 0);
+    reflowInput.SetComputedWidth(size);
+  }
+
+  xoffset += reflowInput.ComputedPhysicalMargin().left;
+  yoffset += reflowInput.ComputedPhysicalMargin().top;
+
+  ReflowOutput barDesiredSize(reflowInput);
+  ReflowChild(aBarFrame, aPresContext, barDesiredSize, reflowInput, xoffset,
+              yoffset, ReflowChildFlags::Default, aStatus);
+  FinishReflowChild(aBarFrame, aPresContext, barDesiredSize, &reflowInput,
+                    xoffset, yoffset, ReflowChildFlags::Default);
+}
+
+nsresult nsMeterFrame::AttributeChanged(int32_t aNameSpaceID,
+                                        nsAtom* 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!");
+    PresShell()->FrameNeedsReflow(barFrame, IntrinsicDirty::None,
+                                  NS_FRAME_IS_DIRTY);
+    InvalidateFrame();
+  }
+
+  return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
+}
+
+LogicalSize nsMeterFrame::ComputeAutoSize(
+    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
+    nscoord aAvailableISize, const LogicalSize& aMargin,
+    const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
+    ComputeSizeFlags aFlags) {
+  RefPtr<nsFontMetrics> fontMet =
+      nsLayoutUtils::GetFontMetricsForFrame(this, 1.0f);
+
+  const WritingMode wm = GetWritingMode();
+  LogicalSize autoSize(wm);
+  autoSize.BSize(wm) = autoSize.ISize(wm) =
+      fontMet->Font().size.ToAppUnits();  // 1em
+
+  if (ResolvedOrientationIsVertical() == wm.IsVertical()) {
+    autoSize.ISize(wm) *= 5;  // 5em
+  } else {
+    autoSize.BSize(wm) *= 5;  // 5em
+  }
+
+  return autoSize.ConvertTo(aWM, wm);
+}
+
+nscoord nsMeterFrame::GetMinISize(gfxContext* aRenderingContext) {
+  RefPtr<nsFontMetrics> fontMet =
+      nsLayoutUtils::GetFontMetricsForFrame(this, 1.0f);
+
+  nscoord minISize = fontMet->Font().size.ToAppUnits();  // 1em
+
+  if (ResolvedOrientationIsVertical() == GetWritingMode().IsVertical()) {
+    // The orientation is inline
+    minISize *= 5;  // 5em
+  }
+
+  return minISize;
+}
+
+nscoord nsMeterFrame::GetPrefISize(gfxContext* 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()->EffectiveAppearance() == StyleAppearance::Meter &&
+         !Style()->HasAuthorSpecifiedBorderOrBackground() && barFrame &&
+         barFrame->StyleDisplay()->EffectiveAppearance() ==
+             StyleAppearance::Meterchunk &&
+         !barFrame->Style()->HasAuthorSpecifiedBorderOrBackground();
+}