third_party/WebKit/Source/core/editing/DragCaretController.cpp

   1 /*
   2  * Copyright (C) 2004, 2008, 2009, 2010 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "core/editing/DragCaretController.h"
  28
  29 #include "core/editing/EditingUtilities.h"
  30 #include "core/layout/LayoutView.h"
  31 #include "core/paint/DeprecatedPaintLayer.h"
  32
  33 namespace blink {
  34
  35 DragCaretController::DragCaretController()
  36     : CaretBase(Visible)
  37 {
  38 }
  39
  40 PassOwnPtrWillBeRawPtr<DragCaretController> DragCaretController::create()
  41 {
  42     return adoptPtrWillBeNoop(new DragCaretController);
  43 }
  44
  45 bool DragCaretController::isContentRichlyEditable() const
  46 {
  47     return isRichlyEditablePosition(m_position.deepEquivalent());
  48 }
  49
  50 void DragCaretController::setCaretPosition(const PositionWithAffinity& position)
  51 {
  52     // for querying Layer::compositingState()
  53     // This code is probably correct, since it doesn't occur in a stack that
  54     // involves updating compositing state.
  55     DisableCompositingQueryAsserts disabler;
  56
  57     if (Node* node = m_position.deepEquivalent().anchorNode())
  58         invalidateCaretRect(node);
  59     m_position = createVisiblePosition(position);
  60     Document* document = nullptr;
  61     if (Node* node = m_position.deepEquivalent().anchorNode()) {
  62         invalidateCaretRect(node);
  63         document = &node->document();
  64     }
  65     if (m_position.isNull() || m_position.isOrphan()) {
  66         clearCaretRect();
  67     } else {
  68         document->updateLayoutTreeIfNeeded();
  69         updateCaretRect(m_position);
  70     }
  71 }
  72
  73 static bool removingNodeRemovesPosition(Node& node, const Position& position)
  74 {
  75     if (!position.anchorNode())
  76         return false;
  77
  78     if (position.anchorNode() == node)
  79         return true;
  80
  81     if (!node.isElementNode())
  82         return false;
  83
  84     Element& element = toElement(node);
  85     return element.containsIncludingShadowDOM(position.anchorNode());
  86 }
  87
  88 void DragCaretController::nodeWillBeRemoved(Node& node)
  89 {
  90     if (!hasCaret() || !node.inActiveDocument())
  91         return;
  92
  93     if (!removingNodeRemovesPosition(node, m_position.deepEquivalent()))
  94         return;
  95
  96     m_position.deepEquivalent().document()->layoutView()->clearSelection();
  97     clear();
  98 }
  99
 100 DEFINE_TRACE(DragCaretController)
 101 {
 102     visitor->trace(m_position);
 103 }
 104
 105 LayoutBlock* DragCaretController::caretLayoutObject() const
 106 {
 107     return CaretBase::caretLayoutObject(m_position.deepEquivalent().anchorNode());
 108 }
 109
 110 bool DragCaretController::isContentEditable() const
 111 {
 112     return rootEditableElementOf(m_position);
 113 }
 114
 115 void DragCaretController::paintDragCaret(LocalFrame* frame, GraphicsContext* p, const LayoutPoint& paintOffset, const LayoutRect& clipRect) const
 116 {
 117     if (m_position.deepEquivalent().anchorNode()->document().frame() == frame)
 118         paintCaret(m_position.deepEquivalent().anchorNode(), p, paintOffset, clipRect);
 119 }
 120
 121 } // namespace blink