From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 layout/forms/nsListControlFrame.cpp | 1211 +++++++++++++++++++++++++++++++++++
 1 file changed, 1211 insertions(+)
 create mode 100644 layout/forms/nsListControlFrame.cpp

(limited to 'layout/forms/nsListControlFrame.cpp')

diff --git a/layout/forms/nsListControlFrame.cpp b/layout/forms/nsListControlFrame.cpp
new file mode 100644
index 0000000000..44ce9fde13
--- /dev/null
+++ b/layout/forms/nsListControlFrame.cpp
@@ -0,0 +1,1211 @@
+/* -*- 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 "nscore.h"
+#include "nsCOMPtr.h"
+#include "nsUnicharUtils.h"
+#include "nsListControlFrame.h"
+#include "HTMLSelectEventListener.h"
+#include "nsGkAtoms.h"
+#include "nsComboboxControlFrame.h"
+#include "nsFontMetrics.h"
+#include "nsIScrollableFrame.h"
+#include "nsCSSRendering.h"
+#include "nsLayoutUtils.h"
+#include "nsDisplayList.h"
+#include "nsContentUtils.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/HTMLOptGroupElement.h"
+#include "mozilla/dom/HTMLOptionsCollection.h"
+#include "mozilla/dom/HTMLSelectElement.h"
+#include "mozilla/dom/MouseEvent.h"
+#include "mozilla/dom/MouseEventBinding.h"
+#include "mozilla/EventStateManager.h"
+#include "mozilla/LookAndFeel.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/StaticPrefs_browser.h"
+#include "mozilla/StaticPrefs_ui.h"
+#include "mozilla/TextEvents.h"
+#include <algorithm>
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+// Static members
+nsListControlFrame* nsListControlFrame::mFocused = nullptr;
+
+//---------------------------------------------------------
+nsListControlFrame* NS_NewListControlFrame(PresShell* aPresShell,
+                                           ComputedStyle* aStyle) {
+  nsListControlFrame* it =
+      new (aPresShell) nsListControlFrame(aStyle, aPresShell->GetPresContext());
+
+  it->AddStateBits(NS_FRAME_INDEPENDENT_SELECTION);
+
+  return it;
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsListControlFrame)
+
+nsListControlFrame::nsListControlFrame(ComputedStyle* aStyle,
+                                       nsPresContext* aPresContext)
+    : nsHTMLScrollFrame(aStyle, aPresContext, kClassID, false),
+      mMightNeedSecondPass(false),
+      mHasPendingInterruptAtStartOfReflow(false),
+      mForceSelection(false) {
+  mChangesSinceDragStart = false;
+
+  mIsAllContentHere = false;
+  mIsAllFramesHere = false;
+  mHasBeenInitialized = false;
+  mNeedToReset = true;
+  mPostChildrenLoadedReset = false;
+}
+
+nsListControlFrame::~nsListControlFrame() = default;
+
+Maybe<nscoord> nsListControlFrame::GetNaturalBaselineBOffset(
+    WritingMode aWM, BaselineSharingGroup aBaselineGroup,
+    BaselineExportContext) const {
+  // Unlike scroll frames which we inherit from, we don't export a baseline.
+  return Nothing{};
+}
+// for Bug 47302 (remove this comment later)
+void nsListControlFrame::Destroy(DestroyContext& aContext) {
+  // get the receiver interface from the browser button's content node
+  NS_ENSURE_TRUE_VOID(mContent);
+
+  // Clear the frame pointer on our event listener, just in case the
+  // event listener can outlive the frame.
+
+  mEventListener->Detach();
+  nsHTMLScrollFrame::Destroy(aContext);
+}
+
+void nsListControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                                          const nsDisplayListSet& aLists) {
+  // We allow visibility:hidden <select>s to contain visible options.
+
+  // Don't allow painting of list controls when painting is suppressed.
+  // XXX why do we need this here? we should never reach this. Maybe
+  // because these can have widgets? Hmm
+  if (aBuilder->IsBackgroundOnly()) return;
+
+  DO_GLOBAL_REFLOW_COUNT_DSP("nsListControlFrame");
+
+  nsHTMLScrollFrame::BuildDisplayList(aBuilder, aLists);
+}
+
+HTMLOptionElement* nsListControlFrame::GetCurrentOption() const {
+  return mEventListener->GetCurrentOption();
+}
+
+/**
+ * This is called by the SelectsAreaFrame, which is the same
+ * as the frame returned by GetOptionsContainer. It's the frame which is
+ * scrolled by us.
+ * @param aPt the offset of this frame, relative to the rendering reference
+ * frame
+ */
+void nsListControlFrame::PaintFocus(DrawTarget* aDrawTarget, nsPoint aPt) {
+  if (mFocused != this) return;
+
+  nsIFrame* containerFrame = GetOptionsContainer();
+  if (!containerFrame) return;
+
+  nsIFrame* childframe = nullptr;
+  nsCOMPtr<nsIContent> focusedContent = GetCurrentOption();
+  if (focusedContent) {
+    childframe = focusedContent->GetPrimaryFrame();
+  }
+
+  nsRect fRect;
+  if (childframe) {
+    // get the child rect
+    fRect = childframe->GetRect();
+    // get it into our coordinates
+    fRect.MoveBy(childframe->GetParent()->GetOffsetTo(this));
+  } else {
+    float inflation = nsLayoutUtils::FontSizeInflationFor(this);
+    fRect.x = fRect.y = 0;
+    if (GetWritingMode().IsVertical()) {
+      fRect.width = GetScrollPortRect().width;
+      fRect.height = CalcFallbackRowBSize(inflation);
+    } else {
+      fRect.width = CalcFallbackRowBSize(inflation);
+      fRect.height = GetScrollPortRect().height;
+    }
+    fRect.MoveBy(containerFrame->GetOffsetTo(this));
+  }
+  fRect += aPt;
+
+  const auto* domOpt = HTMLOptionElement::FromNodeOrNull(focusedContent);
+  const bool isSelected = domOpt && domOpt->Selected();
+
+  // Set up back stop colors and then ask L&F service for the real colors
+  nscolor color =
+      LookAndFeel::Color(isSelected ? LookAndFeel::ColorID::Selecteditemtext
+                                    : LookAndFeel::ColorID::Selecteditem,
+                         this);
+
+  nsCSSRendering::PaintFocus(PresContext(), aDrawTarget, fRect, color);
+}
+
+void nsListControlFrame::InvalidateFocus() {
+  if (mFocused != this) return;
+
+  nsIFrame* containerFrame = GetOptionsContainer();
+  if (containerFrame) {
+    containerFrame->InvalidateFrame();
+  }
+}
+
+NS_QUERYFRAME_HEAD(nsListControlFrame)
+  NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
+  NS_QUERYFRAME_ENTRY(nsISelectControlFrame)
+  NS_QUERYFRAME_ENTRY(nsListControlFrame)
+NS_QUERYFRAME_TAIL_INHERITING(nsHTMLScrollFrame)
+
+#ifdef ACCESSIBILITY
+a11y::AccType nsListControlFrame::AccessibleType() {
+  return a11y::eHTMLSelectListType;
+}
+#endif
+
+// Return true if we found at least one <option> or non-empty <optgroup> label
+// that has a frame.  aResult will be the maximum BSize of those.
+static bool GetMaxRowBSize(nsIFrame* aContainer, WritingMode aWM,
+                           nscoord* aResult) {
+  bool found = false;
+  for (nsIFrame* child : aContainer->PrincipalChildList()) {
+    if (child->GetContent()->IsHTMLElement(nsGkAtoms::optgroup)) {
+      // An optgroup; drill through any scroll frame and recurse.  |inner| might
+      // be null here though if |inner| is an anonymous leaf frame of some sort.
+      auto inner = child->GetContentInsertionFrame();
+      if (inner && GetMaxRowBSize(inner, aWM, aResult)) {
+        found = true;
+      }
+    } else {
+      // an option or optgroup label
+      bool isOptGroupLabel =
+          child->Style()->IsPseudoElement() &&
+          aContainer->GetContent()->IsHTMLElement(nsGkAtoms::optgroup);
+      nscoord childBSize = child->BSize(aWM);
+      // XXX bug 1499176: skip empty <optgroup> labels (zero bsize) for now
+      if (!isOptGroupLabel || childBSize > nscoord(0)) {
+        found = true;
+        *aResult = std::max(childBSize, *aResult);
+      }
+    }
+  }
+  return found;
+}
+
+//-----------------------------------------------------------------
+// Main Reflow for ListBox/Dropdown
+//-----------------------------------------------------------------
+
+nscoord nsListControlFrame::CalcBSizeOfARow() {
+  // Calculate the block size in our writing mode of a single row in the
+  // listbox or dropdown list by using the tallest thing in the subtree,
+  // since there may be option groups in addition to option elements,
+  // either of which may be visible or invisible, may use different
+  // fonts, etc.
+  nscoord rowBSize(0);
+  if (GetContainSizeAxes().mBContained ||
+      !GetMaxRowBSize(GetOptionsContainer(), GetWritingMode(), &rowBSize)) {
+    // We don't have any <option>s or <optgroup> labels with a frame.
+    // (Or we're size-contained in block axis, which has the same outcome for
+    // our sizing.)
+    float inflation = nsLayoutUtils::FontSizeInflationFor(this);
+    rowBSize = CalcFallbackRowBSize(inflation);
+  }
+  return rowBSize;
+}
+
+nscoord nsListControlFrame::GetPrefISize(gfxContext* aRenderingContext) {
+  nscoord result;
+  DISPLAY_PREF_INLINE_SIZE(this, result);
+
+  // Always add scrollbar inline sizes to the pref-inline-size of the
+  // scrolled content. Combobox frames depend on this happening in the
+  // dropdown, and standalone listboxes are overflow:scroll so they need
+  // it too.
+  WritingMode wm = GetWritingMode();
+  Maybe<nscoord> containISize = ContainIntrinsicISize();
+  result = containISize ? *containISize
+                        : GetScrolledFrame()->GetPrefISize(aRenderingContext);
+  LogicalMargin scrollbarSize(wm, GetDesiredScrollbarSizes());
+  result = NSCoordSaturatingAdd(result, scrollbarSize.IStartEnd(wm));
+  return result;
+}
+
+nscoord nsListControlFrame::GetMinISize(gfxContext* aRenderingContext) {
+  nscoord result;
+  DISPLAY_MIN_INLINE_SIZE(this, result);
+
+  // Always add scrollbar inline sizes to the min-inline-size of the
+  // scrolled content. Combobox frames depend on this happening in the
+  // dropdown, and standalone listboxes are overflow:scroll so they need
+  // it too.
+  WritingMode wm = GetWritingMode();
+  Maybe<nscoord> containISize = ContainIntrinsicISize();
+  result = containISize ? *containISize
+                        : GetScrolledFrame()->GetMinISize(aRenderingContext);
+  LogicalMargin scrollbarSize(wm, GetDesiredScrollbarSizes());
+  result += scrollbarSize.IStartEnd(wm);
+
+  return result;
+}
+
+void nsListControlFrame::Reflow(nsPresContext* aPresContext,
+                                ReflowOutput& aDesiredSize,
+                                const ReflowInput& aReflowInput,
+                                nsReflowStatus& aStatus) {
+  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
+  NS_WARNING_ASSERTION(aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE,
+                       "Must have a computed inline size");
+
+  SchedulePaint();
+
+  mHasPendingInterruptAtStartOfReflow = aPresContext->HasPendingInterrupt();
+
+  // If all the content and frames are here
+  // then initialize it before reflow
+  if (mIsAllContentHere && !mHasBeenInitialized) {
+    if (!mIsAllFramesHere) {
+      CheckIfAllFramesHere();
+    }
+    if (mIsAllFramesHere && !mHasBeenInitialized) {
+      mHasBeenInitialized = true;
+    }
+  }
+
+  MarkInReflow();
+  // Due to the fact that our intrinsic block size depends on the block
+  // sizes of our kids, we end up having to do two-pass reflow, in
+  // general -- the first pass to find the intrinsic block size and a
+  // second pass to reflow the scrollframe at that block size (which
+  // will size the scrollbars correctly, etc).
+  //
+  // Naturally, we want to avoid doing the second reflow as much as
+  // possible. We can skip it in the following cases (in all of which the first
+  // reflow is already happening at the right block size):
+  bool autoBSize = (aReflowInput.ComputedBSize() == NS_UNCONSTRAINEDSIZE);
+  Maybe<nscoord> containBSize = ContainIntrinsicBSize(NS_UNCONSTRAINEDSIZE);
+  bool usingContainBSize =
+      autoBSize && containBSize && *containBSize != NS_UNCONSTRAINEDSIZE;
+
+  mMightNeedSecondPass = [&] {
+    if (!autoBSize) {
+      // We're reflowing with a constrained computed block size -- just use that
+      // block size.
+      return false;
+    }
+    if (!IsSubtreeDirty() && !aReflowInput.ShouldReflowAllKids()) {
+      // We're not dirty and have no dirty kids and shouldn't be reflowing all
+      // kids. In this case, our cached max block size of a child is not going
+      // to change.
+      return false;
+    }
+    if (usingContainBSize) {
+      // We're size-contained in the block axis. In this case the size of a row
+      // doesn't depend on our children (it's the "fallback" size).
+      return false;
+    }
+    // We might need to do a second pass. If we do our first reflow using our
+    // cached max block size of a child, then compute the new max block size,
+    // and it's the same as the old one, we might still skip it (see the
+    // IsScrollbarUpdateSuppressed() check).
+    return true;
+  }();
+
+  ReflowInput state(aReflowInput);
+  int32_t length = GetNumberOfRows();
+
+  nscoord oldBSizeOfARow = BSizeOfARow();
+
+  if (!HasAnyStateBits(NS_FRAME_FIRST_REFLOW) && autoBSize) {
+    // When not doing an initial reflow, and when the block size is
+    // auto, start off with our computed block size set to what we'd
+    // expect our block size to be.
+    nscoord computedBSize = CalcIntrinsicBSize(oldBSizeOfARow, length);
+    computedBSize = state.ApplyMinMaxBSize(computedBSize);
+    state.SetComputedBSize(computedBSize);
+  }
+
+  if (usingContainBSize) {
+    state.SetComputedBSize(*containBSize);
+  }
+
+  nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
+
+  if (!mMightNeedSecondPass) {
+    NS_ASSERTION(!autoBSize || BSizeOfARow() == oldBSizeOfARow,
+                 "How did our BSize of a row change if nothing was dirty?");
+    NS_ASSERTION(!autoBSize || !HasAnyStateBits(NS_FRAME_FIRST_REFLOW) ||
+                     usingContainBSize,
+                 "How do we not need a second pass during initial reflow at "
+                 "auto BSize?");
+    NS_ASSERTION(!IsScrollbarUpdateSuppressed(),
+                 "Shouldn't be suppressing if we don't need a second pass!");
+    if (!autoBSize || usingContainBSize) {
+      // Update our mNumDisplayRows based on our new row block size now
+      // that we know it.  Note that if autoBSize and we landed in this
+      // code then we already set mNumDisplayRows in CalcIntrinsicBSize.
+      //  Also note that we can't use BSizeOfARow() here because that
+      // just uses a cached value that we didn't compute.
+      nscoord rowBSize = CalcBSizeOfARow();
+      if (rowBSize == 0) {
+        // Just pick something
+        mNumDisplayRows = 1;
+      } else {
+        mNumDisplayRows = std::max(1, state.ComputedBSize() / rowBSize);
+      }
+    }
+
+    return;
+  }
+
+  mMightNeedSecondPass = false;
+
+  // Now see whether we need a second pass.  If we do, our
+  // nsSelectsAreaFrame will have suppressed the scrollbar update.
+  if (!IsScrollbarUpdateSuppressed()) {
+    // All done.  No need to do more reflow.
+    return;
+  }
+
+  SetSuppressScrollbarUpdate(false);
+
+  // Gotta reflow again.
+  // XXXbz We're just changing the block size here; do we need to dirty
+  // ourselves or anything like that?  We might need to, per the letter
+  // of the reflow protocol, but things seem to work fine without it...
+  // Is that just an implementation detail of nsHTMLScrollFrame that
+  // we're depending on?
+  nsHTMLScrollFrame::DidReflow(aPresContext, &state);
+
+  // Now compute the block size we want to have
+  nscoord computedBSize = CalcIntrinsicBSize(BSizeOfARow(), length);
+  computedBSize = state.ApplyMinMaxBSize(computedBSize);
+  state.SetComputedBSize(computedBSize);
+
+  // XXXbz to make the ascent really correct, we should add our
+  // mComputedPadding.top to it (and subtract it from descent).  Need that
+  // because nsGfxScrollFrame just adds in the border....
+  aStatus.Reset();
+  nsHTMLScrollFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
+}
+
+bool nsListControlFrame::ShouldPropagateComputedBSizeToScrolledContent() const {
+  return true;
+}
+
+//---------------------------------------------------------
+nsContainerFrame* nsListControlFrame::GetContentInsertionFrame() {
+  return GetOptionsContainer()->GetContentInsertionFrame();
+}
+
+//---------------------------------------------------------
+bool nsListControlFrame::ExtendedSelection(int32_t aStartIndex,
+                                           int32_t aEndIndex, bool aClearAll) {
+  return SetOptionsSelectedFromFrame(aStartIndex, aEndIndex, true, aClearAll);
+}
+
+//---------------------------------------------------------
+bool nsListControlFrame::SingleSelection(int32_t aClickedIndex,
+                                         bool aDoToggle) {
+#ifdef ACCESSIBILITY
+  nsCOMPtr<nsIContent> prevOption = mEventListener->GetCurrentOption();
+#endif
+  bool wasChanged = false;
+  // Get Current selection
+  if (aDoToggle) {
+    wasChanged = ToggleOptionSelectedFromFrame(aClickedIndex);
+  } else {
+    wasChanged =
+        SetOptionsSelectedFromFrame(aClickedIndex, aClickedIndex, true, true);
+  }
+  AutoWeakFrame weakFrame(this);
+  ScrollToIndex(aClickedIndex);
+  if (!weakFrame.IsAlive()) {
+    return wasChanged;
+  }
+
+  mStartSelectionIndex = aClickedIndex;
+  mEndSelectionIndex = aClickedIndex;
+  InvalidateFocus();
+
+#ifdef ACCESSIBILITY
+  FireMenuItemActiveEvent(prevOption);
+#endif
+
+  return wasChanged;
+}
+
+void nsListControlFrame::InitSelectionRange(int32_t aClickedIndex) {
+  //
+  // If nothing is selected, set the start selection depending on where
+  // the user clicked and what the initial selection is:
+  // - if the user clicked *before* selectedIndex, set the start index to
+  //   the end of the first contiguous selection.
+  // - if the user clicked *after* the end of the first contiguous
+  //   selection, set the start index to selectedIndex.
+  // - if the user clicked *within* the first contiguous selection, set the
+  //   start index to selectedIndex.
+  // The last two rules, of course, boil down to the same thing: if the user
+  // clicked >= selectedIndex, return selectedIndex.
+  //
+  // This makes it so that shift click works properly when you first click
+  // in a multiple select.
+  //
+  int32_t selectedIndex = GetSelectedIndex();
+  if (selectedIndex >= 0) {
+    // Get the end of the contiguous selection
+    RefPtr<dom::HTMLOptionsCollection> options = GetOptions();
+    NS_ASSERTION(options, "Collection of options is null!");
+    uint32_t numOptions = options->Length();
+    // Push i to one past the last selected index in the group.
+    uint32_t i;
+    for (i = selectedIndex + 1; i < numOptions; i++) {
+      if (!options->ItemAsOption(i)->Selected()) {
+        break;
+      }
+    }
+
+    if (aClickedIndex < selectedIndex) {
+      // User clicked before selection, so start selection at end of
+      // contiguous selection
+      mStartSelectionIndex = i - 1;
+      mEndSelectionIndex = selectedIndex;
+    } else {
+      // User clicked after selection, so start selection at start of
+      // contiguous selection
+      mStartSelectionIndex = selectedIndex;
+      mEndSelectionIndex = i - 1;
+    }
+  }
+}
+
+static uint32_t CountOptionsAndOptgroups(nsIFrame* aFrame) {
+  uint32_t count = 0;
+  for (nsIFrame* child : aFrame->PrincipalChildList()) {
+    nsIContent* content = child->GetContent();
+    if (content) {
+      if (content->IsHTMLElement(nsGkAtoms::option)) {
+        ++count;
+      } else {
+        RefPtr<HTMLOptGroupElement> optgroup =
+            HTMLOptGroupElement::FromNode(content);
+        if (optgroup) {
+          nsAutoString label;
+          optgroup->GetLabel(label);
+          if (label.Length() > 0) {
+            ++count;
+          }
+          count += CountOptionsAndOptgroups(child);
+        }
+      }
+    }
+  }
+  return count;
+}
+
+uint32_t nsListControlFrame::GetNumberOfRows() {
+  return ::CountOptionsAndOptgroups(GetContentInsertionFrame());
+}
+
+//---------------------------------------------------------
+bool nsListControlFrame::PerformSelection(int32_t aClickedIndex, bool aIsShift,
+                                          bool aIsControl) {
+  bool wasChanged = false;
+
+  if (aClickedIndex == kNothingSelected && !mForceSelection) {
+    // Ignore kNothingSelected unless the selection is forced
+  } else if (GetMultiple()) {
+    if (aIsShift) {
+      // Make sure shift+click actually does something expected when
+      // the user has never clicked on the select
+      if (mStartSelectionIndex == kNothingSelected) {
+        InitSelectionRange(aClickedIndex);
+      }
+
+      // Get the range from beginning (low) to end (high)
+      // Shift *always* works, even if the current option is disabled
+      int32_t startIndex;
+      int32_t endIndex;
+      if (mStartSelectionIndex == kNothingSelected) {
+        startIndex = aClickedIndex;
+        endIndex = aClickedIndex;
+      } else if (mStartSelectionIndex <= aClickedIndex) {
+        startIndex = mStartSelectionIndex;
+        endIndex = aClickedIndex;
+      } else {
+        startIndex = aClickedIndex;
+        endIndex = mStartSelectionIndex;
+      }
+
+      // Clear only if control was not pressed
+      wasChanged = ExtendedSelection(startIndex, endIndex, !aIsControl);
+      AutoWeakFrame weakFrame(this);
+      ScrollToIndex(aClickedIndex);
+      if (!weakFrame.IsAlive()) {
+        return wasChanged;
+      }
+
+      if (mStartSelectionIndex == kNothingSelected) {
+        mStartSelectionIndex = aClickedIndex;
+      }
+#ifdef ACCESSIBILITY
+      nsCOMPtr<nsIContent> prevOption = GetCurrentOption();
+#endif
+      mEndSelectionIndex = aClickedIndex;
+      InvalidateFocus();
+
+#ifdef ACCESSIBILITY
+      FireMenuItemActiveEvent(prevOption);
+#endif
+    } else if (aIsControl) {
+      wasChanged = SingleSelection(aClickedIndex, true);  // might destroy us
+    } else {
+      wasChanged = SingleSelection(aClickedIndex, false);  // might destroy us
+    }
+  } else {
+    wasChanged = SingleSelection(aClickedIndex, false);  // might destroy us
+  }
+
+  return wasChanged;
+}
+
+//---------------------------------------------------------
+bool nsListControlFrame::HandleListSelection(dom::Event* aEvent,
+                                             int32_t aClickedIndex) {
+  MouseEvent* mouseEvent = aEvent->AsMouseEvent();
+  bool isControl;
+#ifdef XP_MACOSX
+  isControl = mouseEvent->MetaKey();
+#else
+  isControl = mouseEvent->CtrlKey();
+#endif
+  bool isShift = mouseEvent->ShiftKey();
+  return PerformSelection(aClickedIndex, isShift,
+                          isControl);  // might destroy us
+}
+
+//---------------------------------------------------------
+void nsListControlFrame::CaptureMouseEvents(bool aGrabMouseEvents) {
+  if (aGrabMouseEvents) {
+    PresShell::SetCapturingContent(mContent, CaptureFlags::IgnoreAllowedState);
+  } else {
+    nsIContent* capturingContent = PresShell::GetCapturingContent();
+    if (capturingContent == mContent) {
+      // only clear the capturing content if *we* are the ones doing the
+      // capturing (or if the dropdown is hidden, in which case NO-ONE should
+      // be capturing anything - it could be a scrollbar inside this listbox
+      // which is actually grabbing
+      // This shouldn't be necessary. We should simply ensure that events
+      // targeting scrollbars are never visible to DOM consumers.
+      PresShell::ReleaseCapturingContent();
+    }
+  }
+}
+
+//---------------------------------------------------------
+nsresult nsListControlFrame::HandleEvent(nsPresContext* aPresContext,
+                                         WidgetGUIEvent* aEvent,
+                                         nsEventStatus* aEventStatus) {
+  NS_ENSURE_ARG_POINTER(aEventStatus);
+
+  /*const char * desc[] = {"eMouseMove",
+                          "NS_MOUSE_LEFT_BUTTON_UP",
+                          "NS_MOUSE_LEFT_BUTTON_DOWN",
+                          "<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>",
+                          "NS_MOUSE_MIDDLE_BUTTON_UP",
+                          "NS_MOUSE_MIDDLE_BUTTON_DOWN",
+                          "<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>","<NA>",
+                          "NS_MOUSE_RIGHT_BUTTON_UP",
+                          "NS_MOUSE_RIGHT_BUTTON_DOWN",
+                          "eMouseOver",
+                          "eMouseOut",
+                          "NS_MOUSE_LEFT_DOUBLECLICK",
+                          "NS_MOUSE_MIDDLE_DOUBLECLICK",
+                          "NS_MOUSE_RIGHT_DOUBLECLICK",
+                          "NS_MOUSE_LEFT_CLICK",
+                          "NS_MOUSE_MIDDLE_CLICK",
+                          "NS_MOUSE_RIGHT_CLICK"};
+  int inx = aEvent->mMessage - eMouseEventFirst;
+  if (inx >= 0 && inx <= (NS_MOUSE_RIGHT_CLICK - eMouseEventFirst)) {
+    printf("Mouse in ListFrame %s [%d]\n", desc[inx], aEvent->mMessage);
+  } else {
+    printf("Mouse in ListFrame <UNKNOWN> [%d]\n", aEvent->mMessage);
+  }*/
+
+  if (nsEventStatus_eConsumeNoDefault == *aEventStatus) return NS_OK;
+
+  // disabled state affects how we're selected, but we don't want to go through
+  // nsHTMLScrollFrame if we're disabled.
+  if (IsContentDisabled()) {
+    return nsIFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
+  }
+
+  return nsHTMLScrollFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
+}
+
+//---------------------------------------------------------
+void nsListControlFrame::SetInitialChildList(ChildListID aListID,
+                                             nsFrameList&& aChildList) {
+  if (aListID == FrameChildListID::Principal) {
+    // First check to see if all the content has been added
+    mIsAllContentHere = Select().IsDoneAddingChildren();
+    if (!mIsAllContentHere) {
+      mIsAllFramesHere = false;
+      mHasBeenInitialized = false;
+    }
+  }
+  nsHTMLScrollFrame::SetInitialChildList(aListID, std::move(aChildList));
+}
+
+HTMLSelectElement& nsListControlFrame::Select() const {
+  return *static_cast<HTMLSelectElement*>(GetContent());
+}
+
+//---------------------------------------------------------
+void nsListControlFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
+                              nsIFrame* aPrevInFlow) {
+  nsHTMLScrollFrame::Init(aContent, aParent, aPrevInFlow);
+
+  // we shouldn't have to unregister this listener because when
+  // our frame goes away all these content node go away as well
+  // because our frame is the only one who references them.
+  // we need to hook up our listeners before the editor is initialized
+  mEventListener = new HTMLSelectEventListener(
+      Select(), HTMLSelectEventListener::SelectType::Listbox);
+
+  mStartSelectionIndex = kNothingSelected;
+  mEndSelectionIndex = kNothingSelected;
+}
+
+dom::HTMLOptionsCollection* nsListControlFrame::GetOptions() const {
+  return Select().Options();
+}
+
+dom::HTMLOptionElement* nsListControlFrame::GetOption(uint32_t aIndex) const {
+  return Select().Item(aIndex);
+}
+
+NS_IMETHODIMP
+nsListControlFrame::OnOptionSelected(int32_t aIndex, bool aSelected) {
+  if (aSelected) {
+    ScrollToIndex(aIndex);
+  }
+  return NS_OK;
+}
+
+void nsListControlFrame::OnContentReset() { ResetList(true); }
+
+void nsListControlFrame::ResetList(bool aAllowScrolling) {
+  // if all the frames aren't here
+  // don't bother reseting
+  if (!mIsAllFramesHere) {
+    return;
+  }
+
+  if (aAllowScrolling) {
+    mPostChildrenLoadedReset = true;
+
+    // Scroll to the selected index
+    int32_t indexToSelect = kNothingSelected;
+
+    HTMLSelectElement* selectElement = HTMLSelectElement::FromNode(mContent);
+    if (selectElement) {
+      indexToSelect = selectElement->SelectedIndex();
+      AutoWeakFrame weakFrame(this);
+      ScrollToIndex(indexToSelect);
+      if (!weakFrame.IsAlive()) {
+        return;
+      }
+    }
+  }
+
+  mStartSelectionIndex = kNothingSelected;
+  mEndSelectionIndex = kNothingSelected;
+  InvalidateFocus();
+  // Combobox will redisplay itself with the OnOptionSelected event
+}
+
+void nsListControlFrame::SetFocus(bool aOn, bool aRepaint) {
+  InvalidateFocus();
+
+  if (aOn) {
+    mFocused = this;
+  } else {
+    mFocused = nullptr;
+  }
+
+  InvalidateFocus();
+}
+
+void nsListControlFrame::GetOptionText(uint32_t aIndex, nsAString& aStr) {
+  aStr.Truncate();
+  if (dom::HTMLOptionElement* optionElement = GetOption(aIndex)) {
+    optionElement->GetRenderedLabel(aStr);
+  }
+}
+
+int32_t nsListControlFrame::GetSelectedIndex() {
+  dom::HTMLSelectElement* select =
+      dom::HTMLSelectElement::FromNodeOrNull(mContent);
+  return select->SelectedIndex();
+}
+
+uint32_t nsListControlFrame::GetNumberOfOptions() {
+  dom::HTMLOptionsCollection* options = GetOptions();
+  if (!options) {
+    return 0;
+  }
+
+  return options->Length();
+}
+
+//----------------------------------------------------------------------
+// nsISelectControlFrame
+//----------------------------------------------------------------------
+bool nsListControlFrame::CheckIfAllFramesHere() {
+  // XXX Need to find a fail proof way to determine that
+  // all the frames are there
+  mIsAllFramesHere = true;
+
+  // now make sure we have a frame each piece of content
+
+  return mIsAllFramesHere;
+}
+
+NS_IMETHODIMP
+nsListControlFrame::DoneAddingChildren(bool aIsDone) {
+  mIsAllContentHere = aIsDone;
+  if (mIsAllContentHere) {
+    // Here we check to see if all the frames have been created
+    // for all the content.
+    // If so, then we can initialize;
+    if (!mIsAllFramesHere) {
+      // if all the frames are now present we can initialize
+      if (CheckIfAllFramesHere()) {
+        mHasBeenInitialized = true;
+        ResetList(true);
+      }
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsListControlFrame::AddOption(int32_t aIndex) {
+#ifdef DO_REFLOW_DEBUG
+  printf("---- Id: %d nsLCF %p Added Option %d\n", mReflowId, this, aIndex);
+#endif
+
+  if (!mIsAllContentHere) {
+    mIsAllContentHere = Select().IsDoneAddingChildren();
+    if (!mIsAllContentHere) {
+      mIsAllFramesHere = false;
+      mHasBeenInitialized = false;
+    } else {
+      mIsAllFramesHere =
+          (aIndex == static_cast<int32_t>(GetNumberOfOptions() - 1));
+    }
+  }
+
+  // Make sure we scroll to the selected option as needed
+  mNeedToReset = true;
+
+  if (!mHasBeenInitialized) {
+    return NS_OK;
+  }
+
+  mPostChildrenLoadedReset = mIsAllContentHere;
+  return NS_OK;
+}
+
+static int32_t DecrementAndClamp(int32_t aSelectionIndex, int32_t aLength) {
+  return aLength == 0 ? nsListControlFrame::kNothingSelected
+                      : std::max(0, aSelectionIndex - 1);
+}
+
+NS_IMETHODIMP
+nsListControlFrame::RemoveOption(int32_t aIndex) {
+  MOZ_ASSERT(aIndex >= 0, "negative <option> index");
+
+  // Need to reset if we're a dropdown
+  if (mStartSelectionIndex != kNothingSelected) {
+    NS_ASSERTION(mEndSelectionIndex != kNothingSelected, "");
+    int32_t numOptions = GetNumberOfOptions();
+    // NOTE: numOptions is the new number of options whereas aIndex is the
+    // unadjusted index of the removed option (hence the <= below).
+    NS_ASSERTION(aIndex <= numOptions, "out-of-bounds <option> index");
+
+    int32_t forward = mEndSelectionIndex - mStartSelectionIndex;
+    int32_t* low = forward >= 0 ? &mStartSelectionIndex : &mEndSelectionIndex;
+    int32_t* high = forward >= 0 ? &mEndSelectionIndex : &mStartSelectionIndex;
+    if (aIndex < *low) *low = ::DecrementAndClamp(*low, numOptions);
+    if (aIndex <= *high) *high = ::DecrementAndClamp(*high, numOptions);
+    if (forward == 0) *low = *high;
+  } else
+    NS_ASSERTION(mEndSelectionIndex == kNothingSelected, "");
+
+  InvalidateFocus();
+  return NS_OK;
+}
+
+//---------------------------------------------------------
+// Set the option selected in the DOM.  This method is named
+// as it is because it indicates that the frame is the source
+// of this event rather than the receiver.
+bool nsListControlFrame::SetOptionsSelectedFromFrame(int32_t aStartIndex,
+                                                     int32_t aEndIndex,
+                                                     bool aValue,
+                                                     bool aClearAll) {
+  using OptionFlag = HTMLSelectElement::OptionFlag;
+  RefPtr<HTMLSelectElement> selectElement =
+      HTMLSelectElement::FromNode(mContent);
+
+  HTMLSelectElement::OptionFlags mask = OptionFlag::Notify;
+  if (mForceSelection) {
+    mask += OptionFlag::SetDisabled;
+  }
+  if (aValue) {
+    mask += OptionFlag::IsSelected;
+  }
+  if (aClearAll) {
+    mask += OptionFlag::ClearAll;
+  }
+
+  return selectElement->SetOptionsSelectedByIndex(aStartIndex, aEndIndex, mask);
+}
+
+bool nsListControlFrame::ToggleOptionSelectedFromFrame(int32_t aIndex) {
+  RefPtr<HTMLOptionElement> option = GetOption(static_cast<uint32_t>(aIndex));
+  NS_ENSURE_TRUE(option, false);
+
+  RefPtr<HTMLSelectElement> selectElement =
+      HTMLSelectElement::FromNode(mContent);
+
+  HTMLSelectElement::OptionFlags mask = HTMLSelectElement::OptionFlag::Notify;
+  if (!option->Selected()) {
+    mask += HTMLSelectElement::OptionFlag::IsSelected;
+  }
+
+  return selectElement->SetOptionsSelectedByIndex(aIndex, aIndex, mask);
+}
+
+// Dispatch event and such
+bool nsListControlFrame::UpdateSelection() {
+  if (mIsAllFramesHere) {
+    // if it's a combobox, display the new text. Note that after
+    // FireOnInputAndOnChange we might be dead, as that can run script.
+    AutoWeakFrame weakFrame(this);
+    if (mIsAllContentHere) {
+      RefPtr listener = mEventListener;
+      listener->FireOnInputAndOnChange();
+    }
+    return weakFrame.IsAlive();
+  }
+  return true;
+}
+
+NS_IMETHODIMP_(void)
+nsListControlFrame::OnSetSelectedIndex(int32_t aOldIndex, int32_t aNewIndex) {
+#ifdef ACCESSIBILITY
+  nsCOMPtr<nsIContent> prevOption = GetCurrentOption();
+#endif
+
+  AutoWeakFrame weakFrame(this);
+  ScrollToIndex(aNewIndex);
+  if (!weakFrame.IsAlive()) {
+    return;
+  }
+  mStartSelectionIndex = aNewIndex;
+  mEndSelectionIndex = aNewIndex;
+  InvalidateFocus();
+
+#ifdef ACCESSIBILITY
+  if (aOldIndex != aNewIndex) {
+    FireMenuItemActiveEvent(prevOption);
+  }
+#endif
+}
+
+//----------------------------------------------------------------------
+// End nsISelectControlFrame
+//----------------------------------------------------------------------
+
+class AsyncReset final : public Runnable {
+ public:
+  AsyncReset(nsListControlFrame* aFrame, bool aScroll)
+      : Runnable("AsyncReset"), mFrame(aFrame), mScroll(aScroll) {}
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override {
+    if (mFrame.IsAlive()) {
+      static_cast<nsListControlFrame*>(mFrame.GetFrame())->ResetList(mScroll);
+    }
+    return NS_OK;
+  }
+
+ private:
+  WeakFrame mFrame;
+  bool mScroll;
+};
+
+nsresult nsListControlFrame::SetFormProperty(nsAtom* aName,
+                                             const nsAString& aValue) {
+  if (nsGkAtoms::selected == aName) {
+    return NS_ERROR_INVALID_ARG;  // Selected is readonly according to spec.
+  } else if (nsGkAtoms::selectedindex == aName) {
+    // You shouldn't be calling me for this!!!
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // We should be told about selectedIndex by the DOM element through
+  // OnOptionSelected
+
+  return NS_OK;
+}
+
+void nsListControlFrame::DidReflow(nsPresContext* aPresContext,
+                                   const ReflowInput* aReflowInput) {
+  bool wasInterrupted = !mHasPendingInterruptAtStartOfReflow &&
+                        aPresContext->HasPendingInterrupt();
+
+  nsHTMLScrollFrame::DidReflow(aPresContext, aReflowInput);
+
+  if (mNeedToReset && !wasInterrupted) {
+    mNeedToReset = false;
+    // Suppress scrolling to the selected element if we restored scroll
+    // history state AND the list contents have not changed since we loaded
+    // all the children AND nothing else forced us to scroll by calling
+    // ResetList(true). The latter two conditions are folded into
+    // mPostChildrenLoadedReset.
+    //
+    // The idea is that we want scroll history restoration to trump ResetList
+    // scrolling to the selected element, when the ResetList was probably only
+    // caused by content loading normally.
+    const bool scroll = !DidHistoryRestore() || mPostChildrenLoadedReset;
+    nsContentUtils::AddScriptRunner(new AsyncReset(this, scroll));
+  }
+
+  mHasPendingInterruptAtStartOfReflow = false;
+}
+
+#ifdef DEBUG_FRAME_DUMP
+nsresult nsListControlFrame::GetFrameName(nsAString& aResult) const {
+  return MakeFrameName(u"ListControl"_ns, aResult);
+}
+#endif
+
+nscoord nsListControlFrame::GetBSizeOfARow() { return BSizeOfARow(); }
+
+bool nsListControlFrame::IsOptionInteractivelySelectable(int32_t aIndex) const {
+  auto& select = Select();
+  if (HTMLOptionElement* item = select.Item(aIndex)) {
+    return IsOptionInteractivelySelectable(&select, item);
+  }
+  return false;
+}
+
+bool nsListControlFrame::IsOptionInteractivelySelectable(
+    HTMLSelectElement* aSelect, HTMLOptionElement* aOption) {
+  return !aSelect->IsOptionDisabled(aOption) && aOption->GetPrimaryFrame();
+}
+
+nscoord nsListControlFrame::CalcFallbackRowBSize(float aFontSizeInflation) {
+  RefPtr<nsFontMetrics> fontMet =
+      nsLayoutUtils::GetFontMetricsForFrame(this, aFontSizeInflation);
+  return fontMet->MaxHeight();
+}
+
+nscoord nsListControlFrame::CalcIntrinsicBSize(nscoord aBSizeOfARow,
+                                               int32_t aNumberOfOptions) {
+  mNumDisplayRows = Select().Size();
+  if (mNumDisplayRows < 1) {
+    mNumDisplayRows = 4;
+  }
+  return mNumDisplayRows * aBSizeOfARow;
+}
+
+#ifdef ACCESSIBILITY
+void nsListControlFrame::FireMenuItemActiveEvent(nsIContent* aPreviousOption) {
+  if (mFocused != this) {
+    return;
+  }
+
+  nsIContent* optionContent = GetCurrentOption();
+  if (aPreviousOption == optionContent) {
+    // No change
+    return;
+  }
+
+  if (aPreviousOption) {
+    FireDOMEvent(u"DOMMenuItemInactive"_ns, aPreviousOption);
+  }
+
+  if (optionContent) {
+    FireDOMEvent(u"DOMMenuItemActive"_ns, optionContent);
+  }
+}
+#endif
+
+nsresult nsListControlFrame::GetIndexFromDOMEvent(dom::Event* aMouseEvent,
+                                                  int32_t& aCurIndex) {
+  if (PresShell::GetCapturingContent() != mContent) {
+    // If we're not capturing, then ignore movement in the border
+    nsPoint pt =
+        nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(aMouseEvent, this);
+    nsRect borderInnerEdge = GetScrollPortRect();
+    if (!borderInnerEdge.Contains(pt)) {
+      return NS_ERROR_FAILURE;
+    }
+  }
+
+  RefPtr<dom::HTMLOptionElement> option;
+  for (nsCOMPtr<nsIContent> content =
+           PresContext()->EventStateManager()->GetEventTargetContent(nullptr);
+       content && !option; content = content->GetParent()) {
+    option = dom::HTMLOptionElement::FromNode(content);
+  }
+
+  if (option) {
+    aCurIndex = option->Index();
+    MOZ_ASSERT(aCurIndex >= 0);
+    return NS_OK;
+  }
+
+  return NS_ERROR_FAILURE;
+}
+
+nsresult nsListControlFrame::HandleLeftButtonMouseDown(
+    dom::Event* aMouseEvent) {
+  int32_t selectedIndex;
+  if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
+    // Handle Like List
+    CaptureMouseEvents(true);
+    AutoWeakFrame weakFrame(this);
+    bool change =
+        HandleListSelection(aMouseEvent, selectedIndex);  // might destroy us
+    if (!weakFrame.IsAlive()) {
+      return NS_OK;
+    }
+    mChangesSinceDragStart = change;
+  }
+  return NS_OK;
+}
+
+nsresult nsListControlFrame::HandleLeftButtonMouseUp(dom::Event* aMouseEvent) {
+  if (!StyleVisibility()->IsVisible()) {
+    return NS_OK;
+  }
+  // Notify
+  if (mChangesSinceDragStart) {
+    // reset this so that future MouseUps without a prior MouseDown
+    // won't fire onchange
+    mChangesSinceDragStart = false;
+    RefPtr listener = mEventListener;
+    listener->FireOnInputAndOnChange();
+    // Note that `this` may be dead now, as the above call runs script.
+  }
+  return NS_OK;
+}
+
+nsresult nsListControlFrame::DragMove(dom::Event* aMouseEvent) {
+  NS_ASSERTION(aMouseEvent, "aMouseEvent is null.");
+
+  int32_t selectedIndex;
+  if (NS_SUCCEEDED(GetIndexFromDOMEvent(aMouseEvent, selectedIndex))) {
+    // Don't waste cycles if we already dragged over this item
+    if (selectedIndex == mEndSelectionIndex) {
+      return NS_OK;
+    }
+    MouseEvent* mouseEvent = aMouseEvent->AsMouseEvent();
+    NS_ASSERTION(mouseEvent, "aMouseEvent is not a MouseEvent!");
+    bool isControl;
+#ifdef XP_MACOSX
+    isControl = mouseEvent->MetaKey();
+#else
+    isControl = mouseEvent->CtrlKey();
+#endif
+    AutoWeakFrame weakFrame(this);
+    // Turn SHIFT on when you are dragging, unless control is on.
+    bool wasChanged = PerformSelection(selectedIndex, !isControl, isControl);
+    if (!weakFrame.IsAlive()) {
+      return NS_OK;
+    }
+    mChangesSinceDragStart = mChangesSinceDragStart || wasChanged;
+  }
+  return NS_OK;
+}
+
+//----------------------------------------------------------------------
+// Scroll helpers.
+//----------------------------------------------------------------------
+void nsListControlFrame::ScrollToIndex(int32_t aIndex) {
+  if (aIndex < 0) {
+    // XXX shouldn't we just do nothing if we're asked to scroll to
+    // kNothingSelected?
+    ScrollTo(nsPoint(0, 0), ScrollMode::Instant);
+  } else {
+    RefPtr<dom::HTMLOptionElement> option =
+        GetOption(AssertedCast<uint32_t>(aIndex));
+    if (option) {
+      ScrollToFrame(*option);
+    }
+  }
+}
+
+void nsListControlFrame::ScrollToFrame(dom::HTMLOptionElement& aOptElement) {
+  // otherwise we find the content's frame and scroll to it
+  if (nsIFrame* childFrame = aOptElement.GetPrimaryFrame()) {
+    RefPtr<mozilla::PresShell> presShell = PresShell();
+    presShell->ScrollFrameIntoView(childFrame, Nothing(), ScrollAxis(),
+                                   ScrollAxis(),
+                                   ScrollFlags::ScrollOverflowHidden |
+                                       ScrollFlags::ScrollFirstAncestorOnly);
+  }
+}
+
+void nsListControlFrame::UpdateSelectionAfterKeyEvent(
+    int32_t aNewIndex, uint32_t aCharCode, bool aIsShift, bool aIsControlOrMeta,
+    bool aIsControlSelectMode) {
+  // If you hold control, but not shift, no key will actually do anything
+  // except space.
+  AutoWeakFrame weakFrame(this);
+  bool wasChanged = false;
+  if (aIsControlOrMeta && !aIsShift && aCharCode != ' ') {
+#ifdef ACCESSIBILITY
+    nsCOMPtr<nsIContent> prevOption = GetCurrentOption();
+#endif
+    mStartSelectionIndex = aNewIndex;
+    mEndSelectionIndex = aNewIndex;
+    InvalidateFocus();
+    ScrollToIndex(aNewIndex);
+    if (!weakFrame.IsAlive()) {
+      return;
+    }
+
+#ifdef ACCESSIBILITY
+    FireMenuItemActiveEvent(prevOption);
+#endif
+  } else if (aIsControlSelectMode && aCharCode == ' ') {
+    wasChanged = SingleSelection(aNewIndex, true);
+  } else {
+    wasChanged = PerformSelection(aNewIndex, aIsShift, aIsControlOrMeta);
+  }
+  if (wasChanged && weakFrame.IsAlive()) {
+    // dispatch event, update combobox, etc.
+    UpdateSelection();
+  }
+}
-- 
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