1 files changed, 169 insertions, 0 deletions
diff --git a/layout/xul/tree/nsTreeColFrame.cpp b/layout/xul/tree/nsTreeColFrame.cpp
new file mode 100644
index 0000000000..d075da8a72
--- /dev/null
+++ b/layout/xul/tree/nsTreeColFrame.cpp
@@ -0,0 +1,169 @@
+/* -*- 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 "nsTreeColFrame.h"
+
+#include "mozilla/ComputedStyle.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/dom/XULTreeElement.h"
+#include "mozilla/CSSOrderAwareFrameIterator.h"
+#include "nsCOMPtr.h"
+#include "nsGkAtoms.h"
+#include "nsIContent.h"
+#include "nsNameSpaceManager.h"
+#include "nsTreeColumns.h"
+#include "nsDisplayList.h"
+#include "nsTreeBodyFrame.h"
+#include "nsXULElement.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+//
+// NS_NewTreeColFrame
+//
+// Creates a new col frame
+//
+nsIFrame* NS_NewTreeColFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
+  return new (aPresShell) nsTreeColFrame(aStyle, aPresShell->GetPresContext());
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsTreeColFrame)
+
+// Destructor
+nsTreeColFrame::~nsTreeColFrame() = default;
+
+void nsTreeColFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
+                          nsIFrame* aPrevInFlow) {
+  nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
+  InvalidateColumns();
+}
+
+void nsTreeColFrame::DestroyFrom(nsIFrame* aDestructRoot,
+                                 PostDestroyData& aPostDestroyData) {
+  InvalidateColumns(false);
+  nsBoxFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
+}
+
+nsresult nsTreeColFrame::AttributeChanged(int32_t aNameSpaceID,
+                                          nsAtom* aAttribute,
+                                          int32_t aModType) {
+  nsresult rv =
+      nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
+
+  if (aAttribute == nsGkAtoms::primary) {
+    InvalidateColumns();
+  }
+
+  return rv;
+}
+
+void nsTreeColFrame::SetXULBounds(nsBoxLayoutState& aBoxLayoutState,
+                                  const nsRect& aRect,
+                                  bool aRemoveOverflowArea) {
+  nscoord oldWidth = mRect.width;
+
+  nsBoxFrame::SetXULBounds(aBoxLayoutState, aRect, aRemoveOverflowArea);
+  if (mRect.width != oldWidth) {
+    RefPtr<XULTreeElement> tree = GetTree();
+    if (tree) {
+      tree->Invalidate();
+    }
+  }
+}
+
+XULTreeElement* nsTreeColFrame::GetTree() {
+  nsIContent* parent = mContent->GetParent();
+  return parent ? XULTreeElement::FromNodeOrNull(parent->GetParent()) : nullptr;
+}
+
+void nsTreeColFrame::InvalidateColumns(bool aCanWalkFrameTree) {
+  RefPtr<XULTreeElement> tree = GetTree();
+  if (!tree) {
+    return;
+  }
+
+  nsTreeBodyFrame* body = aCanWalkFrameTree
+                              ? tree->GetTreeBodyFrame(FlushType::None)
+                              : tree->GetCachedTreeBodyFrame();
+
+  if (!body) {
+    return;
+  }
+
+  RefPtr<nsTreeColumns> columns = body->Columns();
+  if (!columns) {
+    return;
+  }
+
+  columns->InvalidateColumns();
+}
+
+namespace mozilla {
+
+class nsDisplayXULTreeColSplitterTarget final : public nsDisplayItem {
+ public:
+  nsDisplayXULTreeColSplitterTarget(nsDisplayListBuilder* aBuilder,
+                                    nsIFrame* aFrame)
+      : nsDisplayItem(aBuilder, aFrame) {
+    MOZ_COUNT_CTOR(nsDisplayXULTreeColSplitterTarget);
+  }
+  MOZ_COUNTED_DTOR_OVERRIDE(nsDisplayXULTreeColSplitterTarget)
+
+  virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
+                       HitTestState* aState,
+                       nsTArray<nsIFrame*>* aOutFrames) override;
+  NS_DISPLAY_DECL_NAME("XULTreeColSplitterTarget",
+                       TYPE_XUL_TREE_COL_SPLITTER_TARGET)
+};
+
+void nsDisplayXULTreeColSplitterTarget::HitTest(
+    nsDisplayListBuilder* aBuilder, const nsRect& aRect, HitTestState* aState,
+    nsTArray<nsIFrame*>* aOutFrames) {
+  nsRect rect = aRect - ToReferenceFrame();
+  // If we are in either in the first 4 pixels or the last 4 pixels, we're going
+  // to do something really strange.  Check for an adjacent splitter.
+  bool left = false;
+  bool right = false;
+  if (mFrame->GetSize().width - nsPresContext::CSSPixelsToAppUnits(4) <=
+      rect.XMost()) {
+    right = true;
+  } else if (nsPresContext::CSSPixelsToAppUnits(4) > rect.x) {
+    left = true;
+  }
+
+  // Swap left and right for RTL trees in order to find the correct splitter
+  if (mFrame->StyleVisibility()->mDirection == StyleDirection::Rtl) {
+    std::swap(left, right);
+  }
+
+  if (left || right) {
+    nsIFrame* child = nsBoxFrame::SlowOrdinalGroupAwareSibling(mFrame, right);
+    // We are a header. Look for the correct splitter.
+    if (child && child->GetContent()->IsXULElement(nsGkAtoms::splitter)) {
+      aOutFrames->AppendElement(child);
+    }
+  }
+}
+
+}  // namespace mozilla
+
+void nsTreeColFrame::BuildDisplayListForChildren(
+    nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) {
+  if (!aBuilder->IsForEventDelivery()) {
+    nsBoxFrame::BuildDisplayListForChildren(aBuilder, aLists);
+    return;
+  }
+
+  nsDisplayListCollection set(aBuilder);
+  nsBoxFrame::BuildDisplayListForChildren(aBuilder, set);
+
+  WrapListsInRedirector(aBuilder, set, aLists);
+
+  aLists.Content()->AppendNewToTop<nsDisplayXULTreeColSplitterTarget>(aBuilder,
+                                                                      this);
+}