Add m-esr52 at 52.6.0

1 files changed, 206 insertions, 0 deletions

diff --git a/layout/forms/nsSelectsAreaFrame.cpp b/layout/forms/nsSelectsAreaFrame.cpp
new file mode 100644
index 0000000000..dd613ae9fd
--- /dev/null
+++ b/layout/forms/nsSelectsAreaFrame.cpp
@@ -0,0 +1,206 @@
+/* -*- 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 "nsSelectsAreaFrame.h"
+#include "nsIContent.h"
+#include "nsListControlFrame.h"
+#include "nsDisplayList.h"
+#include "WritingModes.h"
+
+using namespace mozilla;
+
+nsContainerFrame*
+NS_NewSelectsAreaFrame(nsIPresShell* aShell, nsStyleContext* aContext, nsFrameState aFlags)
+{
+  nsSelectsAreaFrame* it = new (aShell) nsSelectsAreaFrame(aContext);
+
+  // We need NS_BLOCK_FLOAT_MGR to ensure that the options inside the select
+  // aren't expanded by right floats outside the select.
+  it->AddStateBits(aFlags | NS_BLOCK_FLOAT_MGR);
+
+  return it;
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsSelectsAreaFrame)
+
+//---------------------------------------------------------
+/**
+ * This wrapper class lets us redirect mouse hits from the child frame of
+ * an option element to the element's own frame.
+ * REVIEW: This is what nsSelectsAreaFrame::GetFrameForPoint used to do
+ */
+class nsDisplayOptionEventGrabber : public nsDisplayWrapList {
+public:
+  nsDisplayOptionEventGrabber(nsDisplayListBuilder* aBuilder,
+                              nsIFrame* aFrame, nsDisplayItem* aItem)
+    : nsDisplayWrapList(aBuilder, aFrame, aItem) {}
+  nsDisplayOptionEventGrabber(nsDisplayListBuilder* aBuilder,
+                              nsIFrame* aFrame, nsDisplayList* aList)
+    : nsDisplayWrapList(aBuilder, aFrame, aList) {}
+  virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
+                       HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) override;
+  virtual bool ShouldFlattenAway(nsDisplayListBuilder* aBuilder) override {
+    return false;
+  }
+  NS_DISPLAY_DECL_NAME("OptionEventGrabber", TYPE_OPTION_EVENT_GRABBER)
+};
+
+void nsDisplayOptionEventGrabber::HitTest(nsDisplayListBuilder* aBuilder,
+    const nsRect& aRect, HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
+{
+  nsTArray<nsIFrame*> outFrames;
+  mList.HitTest(aBuilder, aRect, aState, &outFrames);
+
+  for (uint32_t i = 0; i < outFrames.Length(); i++) {
+    nsIFrame* selectedFrame = outFrames.ElementAt(i);
+    while (selectedFrame &&
+           !(selectedFrame->GetContent() &&
+             selectedFrame->GetContent()->IsHTMLElement(nsGkAtoms::option))) {
+      selectedFrame = selectedFrame->GetParent();
+    }
+    if (selectedFrame) {
+      aOutFrames->AppendElement(selectedFrame);
+    } else {
+      // keep the original result, which could be this frame
+      aOutFrames->AppendElement(outFrames.ElementAt(i));
+    }
+  }
+}
+
+class nsOptionEventGrabberWrapper : public nsDisplayWrapper
+{
+public:
+  nsOptionEventGrabberWrapper() {}
+  virtual nsDisplayItem* WrapList(nsDisplayListBuilder* aBuilder,
+                                  nsIFrame* aFrame, nsDisplayList* aList) {
+    return new (aBuilder) nsDisplayOptionEventGrabber(aBuilder, aFrame, aList);
+  }
+  virtual nsDisplayItem* WrapItem(nsDisplayListBuilder* aBuilder,
+                                  nsDisplayItem* aItem) {
+    return new (aBuilder) nsDisplayOptionEventGrabber(aBuilder, aItem->Frame(), aItem);
+  }
+};
+
+static nsListControlFrame* GetEnclosingListFrame(nsIFrame* aSelectsAreaFrame)
+{
+  nsIFrame* frame = aSelectsAreaFrame->GetParent();
+  while (frame) {
+    if (frame->GetType() == nsGkAtoms::listControlFrame)
+      return static_cast<nsListControlFrame*>(frame);
+    frame = frame->GetParent();
+  }
+  return nullptr;
+}
+
+class nsDisplayListFocus : public nsDisplayItem {
+public:
+  nsDisplayListFocus(nsDisplayListBuilder* aBuilder,
+                     nsSelectsAreaFrame* aFrame) :
+    nsDisplayItem(aBuilder, aFrame) {
+    MOZ_COUNT_CTOR(nsDisplayListFocus);
+  }
+#ifdef NS_BUILD_REFCNT_LOGGING
+  virtual ~nsDisplayListFocus() {
+    MOZ_COUNT_DTOR(nsDisplayListFocus);
+  }
+#endif
+
+  virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override {
+    *aSnap = false;
+    // override bounds because the list item focus ring may extend outside
+    // the nsSelectsAreaFrame
+    nsListControlFrame* listFrame = GetEnclosingListFrame(Frame());
+    return listFrame->GetVisualOverflowRectRelativeToSelf() +
+           listFrame->GetOffsetToCrossDoc(ReferenceFrame());
+  }
+  virtual void Paint(nsDisplayListBuilder* aBuilder,
+                     nsRenderingContext* aCtx) override {
+    nsListControlFrame* listFrame = GetEnclosingListFrame(Frame());
+    // listFrame must be non-null or we wouldn't get called.
+    listFrame->PaintFocus(aCtx->GetDrawTarget(),
+                          aBuilder->ToReferenceFrame(listFrame));
+  }
+  NS_DISPLAY_DECL_NAME("ListFocus", TYPE_LIST_FOCUS)
+};
+
+void
+nsSelectsAreaFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                     const nsRect&           aDirtyRect,
+                                     const nsDisplayListSet& aLists)
+{
+  if (!aBuilder->IsForEventDelivery()) {
+    BuildDisplayListInternal(aBuilder, aDirtyRect, aLists);
+    return;
+  }
+
+  nsDisplayListCollection set;
+  BuildDisplayListInternal(aBuilder, aDirtyRect, set);
+  
+  nsOptionEventGrabberWrapper wrapper;
+  wrapper.WrapLists(aBuilder, this, set, aLists);
+}
+
+void
+nsSelectsAreaFrame::BuildDisplayListInternal(nsDisplayListBuilder*   aBuilder,
+                                             const nsRect&           aDirtyRect,
+                                             const nsDisplayListSet& aLists)
+{
+  nsBlockFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
+
+  nsListControlFrame* listFrame = GetEnclosingListFrame(this);
+  if (listFrame && listFrame->IsFocused()) {
+    // we can't just associate the display item with the list frame,
+    // because then the list's scrollframe won't clip it (the scrollframe
+    // only clips contained descendants).
+    aLists.Outlines()->AppendNewToTop(new (aBuilder)
+      nsDisplayListFocus(aBuilder, this));
+  }
+}
+
+void
+nsSelectsAreaFrame::Reflow(nsPresContext*           aPresContext, 
+                           ReflowOutput&     aDesiredSize,
+                           const ReflowInput& aReflowInput, 
+                           nsReflowStatus&          aStatus)
+{
+  nsListControlFrame* list = GetEnclosingListFrame(this);
+  NS_ASSERTION(list,
+               "Must have an nsListControlFrame!  Frame constructor is "
+               "broken");
+
+  bool isInDropdownMode = list->IsInDropDownMode();
+
+  // See similar logic in nsListControlFrame::Reflow and
+  // nsListControlFrame::ReflowAsDropdown.  We need to match it here.
+  WritingMode wm = aReflowInput.GetWritingMode();
+  nscoord oldBSize;
+  if (isInDropdownMode) {
+    // Store the block size now in case it changes during
+    // nsBlockFrame::Reflow for some odd reason.
+    if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
+      oldBSize = BSize(wm);
+    } else {
+      oldBSize = NS_UNCONSTRAINEDSIZE;
+    }
+  }
+
+  nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
+
+  // Check whether we need to suppress scrollbar updates.  We want to do
+  // that if we're in a possible first pass and our block size of a row
+  // has changed.
+  if (list->MightNeedSecondPass()) {
+    nscoord newBSizeOfARow = list->CalcBSizeOfARow();
+    // We'll need a second pass if our block size of a row changed.  For
+    // comboboxes, we'll also need it if our block size changed.  If
+    // we're going to do a second pass, suppress scrollbar updates for
+    // this pass.
+    if (newBSizeOfARow != mBSizeOfARow ||
+        (isInDropdownMode && (oldBSize != aDesiredSize.BSize(wm) ||
+                              oldBSize != BSize(wm)))) {
+      mBSizeOfARow = newBSizeOfARow;
+      list->SetSuppressScrollbarUpdate(true);
+    }
+  }
+}