tubestation/layout/xul/tree/nsTreeColFrame.cpp

/* -*- 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)

  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) {
  nsBoxFrame::BuildDisplayListForChildren(aBuilder, aLists);
  if (aBuilder->IsForEventDelivery()) {
    aLists.Content()->AppendNewToTop<nsDisplayXULTreeColSplitterTarget>(
        aBuilder, this);
  }
}