1 files changed, 213 insertions, 0 deletions
diff --git a/layout/forms/nsRangeFrame.h b/layout/forms/nsRangeFrame.h
new file mode 100644
index 0000000000..4d2073aa50
--- /dev/null
+++ b/layout/forms/nsRangeFrame.h
@@ -0,0 +1,213 @@
+/* -*- 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/. */
+
+#ifndef nsRangeFrame_h___
+#define nsRangeFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Decimal.h"
+#include "mozilla/EventForwards.h"
+#include "nsContainerFrame.h"
+#include "nsIAnonymousContentCreator.h"
+#include "nsIDOMEventListener.h"
+#include "nsCOMPtr.h"
+#include "nsTArray.h"
+
+class nsDisplayRangeFocusRing;
+
+namespace mozilla {
+class ListMutationObserver;
+class PresShell;
+namespace dom {
+class Event;
+class HTMLInputElement;
+}  // namespace dom
+}  // namespace mozilla
+
+class nsRangeFrame final : public nsContainerFrame,
+                           public nsIAnonymousContentCreator {
+  friend nsIFrame* NS_NewRangeFrame(mozilla::PresShell* aPresShell,
+                                    ComputedStyle* aStyle);
+
+  void Init(nsIContent* aContent, nsContainerFrame* aParent,
+            nsIFrame* aPrevInFlow) override;
+
+  friend class nsDisplayRangeFocusRing;
+
+  explicit nsRangeFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);
+  virtual ~nsRangeFrame();
+
+  typedef mozilla::PseudoStyleType PseudoStyleType;
+  typedef mozilla::dom::Element Element;
+
+ public:
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS(nsRangeFrame)
+
+  // nsIFrame overrides
+  void Destroy(DestroyContext&) override;
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        const nsDisplayListSet& aLists) override;
+
+  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+                      const ReflowInput& aReflowInput,
+                      nsReflowStatus& aStatus) override;
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const override {
+    return MakeFrameName(u"Range"_ns, aResult);
+  }
+#endif
+
+#ifdef ACCESSIBILITY
+  virtual mozilla::a11y::AccType AccessibleType() override;
+#endif
+
+  // nsIAnonymousContentCreator
+  virtual nsresult CreateAnonymousContent(
+      nsTArray<ContentInfo>& aElements) override;
+  virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
+                                        uint32_t aFilter) override;
+
+  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                    int32_t aModType) override;
+
+  mozilla::LogicalSize ComputeAutoSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;
+
+  virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
+  virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;
+
+  /**
+   * Returns true if the slider's thumb moves horizontally, or else false if it
+   * moves vertically.
+   */
+  bool IsHorizontal() const;
+
+  /**
+   * Returns true if the slider is oriented along the inline axis.
+   */
+  bool IsInlineOriented() const {
+    return IsHorizontal() != GetWritingMode().IsVertical();
+  }
+
+  /**
+   * Returns true if the slider's thumb moves right-to-left for increasing
+   * values; only relevant when IsHorizontal() is true.
+   */
+  bool IsRightToLeft() const {
+    MOZ_ASSERT(IsHorizontal());
+    return GetWritingMode().IsPhysicalRTL();
+  }
+
+  /**
+   * Returns true if the range progresses upwards (for vertical ranges in
+   * horizontal writing mode, or for bidi-RTL in vertical mode). Only
+   * relevant when IsHorizontal() is false.
+   */
+  bool IsUpwards() const {
+    MOZ_ASSERT(!IsHorizontal());
+    mozilla::WritingMode wm = GetWritingMode();
+    return wm.GetBlockDir() == mozilla::WritingMode::eBlockTB ||
+           wm.GetInlineDir() == mozilla::WritingMode::eInlineBTT;
+  }
+
+  double GetMin() const;
+  double GetMax() const;
+  double GetValue() const;
+
+  /**
+   * Returns the input element's value as a fraction of the difference between
+   * the input's minimum and its maximum (i.e. returns 0.0 when the value is
+   * the same as the minimum, and returns 1.0 when the value is the same as the
+   * maximum).
+   */
+  double GetValueAsFractionOfRange();
+
+  /**
+   * Returns the given value as a fraction of the difference between the input's
+   * minimum and its maximum (i.e. returns 0.0 when the value is the same as the
+   * input's minimum, and returns 1.0 when the value is the same as the input's
+   * maximum).
+   */
+  double GetDoubleAsFractionOfRange(const mozilla::Decimal& value);
+
+  /**
+   * Returns whether the frame and its child should use the native style.
+   */
+  bool ShouldUseNativeStyle() const;
+
+  mozilla::Decimal GetValueAtEventPoint(mozilla::WidgetGUIEvent* aEvent);
+
+  /**
+   * Helper that's used when the value of the range changes to reposition the
+   * thumb, resize the range-progress element, and schedule a repaint. (This
+   * does not reflow, since the position and size of the thumb and
+   * range-progress element do not affect the position or size of any other
+   * frames.)
+   */
+  void UpdateForValueChange();
+
+  nsTArray<mozilla::Decimal> TickMarks();
+
+  /**
+   * Returns the given value's offset from the range's nearest list tick mark
+   * or NaN if there are no tick marks.
+   */
+  mozilla::Decimal NearestTickMark(const mozilla::Decimal& aValue);
+
+ protected:
+  mozilla::dom::HTMLInputElement& InputElement() const;
+
+ private:
+  // Return our preferred size in the cross-axis (the axis perpendicular
+  // to the direction of movement of the thumb).
+  nscoord AutoCrossSize(mozilla::Length aEm);
+
+  // Helper function which reflows the anonymous div frames.
+  void ReflowAnonymousContent(nsPresContext* aPresContext,
+                              ReflowOutput& aDesiredSize,
+                              const ReflowInput& aReflowInput);
+
+  void DoUpdateThumbPosition(nsIFrame* aThumbFrame, const nsSize& aRangeSize);
+
+  void DoUpdateRangeProgressFrame(nsIFrame* aProgressFrame,
+                                  const nsSize& aRangeSize);
+
+  /**
+   * The div used to show the ::-moz-range-track pseudo-element.
+   * @see nsRangeFrame::CreateAnonymousContent
+   */
+  nsCOMPtr<Element> mTrackDiv;
+
+  /**
+   * The div used to show the ::-moz-range-progress pseudo-element, which is
+   * used to (optionally) style the specific chunk of track leading up to the
+   * thumb's current position.
+   * @see nsRangeFrame::CreateAnonymousContent
+   */
+  nsCOMPtr<Element> mProgressDiv;
+
+  /**
+   * The div used to show the ::-moz-range-thumb pseudo-element.
+   * @see nsRangeFrame::CreateAnonymousContent
+   */
+  nsCOMPtr<Element> mThumbDiv;
+
+  /**
+   * This mutation observer is used to invalidate paint when the @list changes,
+   * when a @list exists.
+   */
+  RefPtr<mozilla::ListMutationObserver> mListMutationObserver;
+};
+
+#endif