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/Caret.h" 28 29 #include "core/dom/Document.h" 30 #include "core/editing/htmlediting.h" 31 #include "core/frame/LocalFrame.h" 32 #include "core/frame/Settings.h" 33 #include "core/rendering/RenderBlock.h" 34 #include "core/rendering/RenderView.h" 35 #include "platform/graphics/GraphicsContext.h" 36 37 namespace WebCore { 38 39 CaretBase::CaretBase(CaretVisibility visibility) 40 : m_caretRectNeedsUpdate(true) 41 , m_caretVisibility(visibility) 42 { 43 } 44 45 DragCaretController::DragCaretController() 46 : CaretBase(Visible) 47 { 48 } 49 50 PassOwnPtrWillBeRawPtr<DragCaretController> DragCaretController::create() 51 { 52 return adoptPtrWillBeNoop(new DragCaretController); 53 } 54 55 bool DragCaretController::isContentRichlyEditable() const 56 { 57 return isRichlyEditablePosition(m_position.deepEquivalent()); 58 } 59 60 void DragCaretController::setCaretPosition(const VisiblePosition& position) 61 { 62 if (Node* node = m_position.deepEquivalent().deprecatedNode()) 63 invalidateCaretRect(node); 64 m_position = position; 65 setCaretRectNeedsUpdate(); 66 Document* document = 0; 67 if (Node* node = m_position.deepEquivalent().deprecatedNode()) { 68 invalidateCaretRect(node); 69 document = &node->document(); 70 } 71 if (m_position.isNull() || m_position.isOrphan()) 72 clearCaretRect(); 73 else 74 updateCaretRect(document, m_position); 75 } 76 77 static bool removingNodeRemovesPosition(Node& node, const Position& position) 78 { 79 if (!position.anchorNode()) 80 return false; 81 82 if (position.anchorNode() == node) 83 return true; 84 85 if (!node.isElementNode()) 86 return false; 87 88 Element& element = toElement(node); 89 return element.containsIncludingShadowDOM(position.anchorNode()); 90 } 91 92 void DragCaretController::nodeWillBeRemoved(Node& node) 93 { 94 if (!hasCaret() || !node.inActiveDocument()) 95 return; 96 97 if (!removingNodeRemovesPosition(node, m_position.deepEquivalent())) 98 return; 99 100 m_position.deepEquivalent().document()->renderView()->clearSelection(); 101 clear(); 102 } 103 104 void DragCaretController::trace(Visitor* visitor) 105 { 106 visitor->trace(m_position); 107 } 108 109 void CaretBase::clearCaretRect() 110 { 111 m_caretLocalRect = LayoutRect(); 112 } 113 114 static inline bool caretRendersInsideNode(Node* node) 115 { 116 return node && !isRenderedTable(node) && !editingIgnoresContent(node); 117 } 118 119 RenderObject* CaretBase::caretRenderer(Node* node) 120 { 121 if (!node) 122 return 0; 123 124 RenderObject* renderer = node->renderer(); 125 if (!renderer) 126 return 0; 127 128 // if caretNode is a block and caret is inside it then caret should be painted by that block 129 bool paintedByBlock = renderer->isRenderBlock() && caretRendersInsideNode(node); 130 return paintedByBlock ? renderer : renderer->containingBlock(); 131 } 132 133 bool CaretBase::updateCaretRect(Document* document, const VisiblePosition& caretPosition) 134 { 135 document->updateRenderTreeIfNeeded(); 136 m_caretLocalRect = LayoutRect(); 137 138 m_caretRectNeedsUpdate = false; 139 140 if (caretPosition.isNull()) 141 return false; 142 143 ASSERT(caretPosition.deepEquivalent().deprecatedNode()->renderer()); 144 145 // First compute a rect local to the renderer at the selection start. 146 RenderObject* renderer; 147 LayoutRect localRect = caretPosition.localCaretRect(renderer); 148 149 // Get the renderer that will be responsible for painting the caret 150 // (which is either the renderer we just found, or one of its containers). 151 RenderObject* caretPainter = caretRenderer(caretPosition.deepEquivalent().deprecatedNode()); 152 153 // Compute an offset between the renderer and the caretPainter. 154 bool unrooted = false; 155 while (renderer != caretPainter) { 156 RenderObject* containerObject = renderer->container(); 157 if (!containerObject) { 158 unrooted = true; 159 break; 160 } 161 localRect.move(renderer->offsetFromContainer(containerObject, localRect.location())); 162 renderer = containerObject; 163 } 164 165 if (!unrooted) 166 m_caretLocalRect = localRect; 167 168 return true; 169 } 170 171 RenderObject* DragCaretController::caretRenderer() const 172 { 173 return CaretBase::caretRenderer(m_position.deepEquivalent().deprecatedNode()); 174 } 175 176 IntRect CaretBase::absoluteBoundsForLocalRect(Node* node, const LayoutRect& rect) const 177 { 178 RenderObject* caretPainter = caretRenderer(node); 179 if (!caretPainter) 180 return IntRect(); 181 182 LayoutRect localRect(rect); 183 if (caretPainter->isBox()) 184 toRenderBox(caretPainter)->flipForWritingMode(localRect); 185 return caretPainter->localToAbsoluteQuad(FloatRect(localRect)).enclosingBoundingBox(); 186 } 187 188 void CaretBase::repaintCaretForLocalRect(Node* node, const LayoutRect& rect) 189 { 190 RenderObject* caretPainter = caretRenderer(node); 191 if (!caretPainter) 192 return; 193 194 // FIXME: Need to over-paint 1 pixel to workaround some rounding problems. 195 // https://bugs.webkit.org/show_bug.cgi?id=108283 196 LayoutRect inflatedRect = rect; 197 inflatedRect.inflate(1); 198 199 caretPainter->invalidatePaintRectangle(inflatedRect); 200 } 201 202 bool CaretBase::shouldRepaintCaret(const RenderView* view, bool isContentEditable) const 203 { 204 ASSERT(view); 205 bool caretBrowsing = false; 206 if (FrameView* frameView = view->frameView()) { 207 LocalFrame& frame = frameView->frame(); // The frame where the selection started 208 caretBrowsing = frame.settings() && frame.settings()->caretBrowsingEnabled(); 209 } 210 return (caretBrowsing || isContentEditable); 211 } 212 213 void CaretBase::invalidateCaretRect(Node* node, bool caretRectChanged) 214 { 215 // EDIT FIXME: This is an unfortunate hack. 216 // Basically, we can't trust this layout position since we 217 // can't guarantee that the check to see if we are in unrendered 218 // content will work at this point. We may have to wait for 219 // a layout and re-render of the document to happen. So, resetting this 220 // flag will cause another caret layout to happen the first time 221 // that we try to paint the caret after this call. That one will work since 222 // it happens after the document has accounted for any editing 223 // changes which may have been done. 224 // And, we need to leave this layout here so the caret moves right 225 // away after clicking. 226 m_caretRectNeedsUpdate = true; 227 228 if (caretRectChanged) 229 return; 230 231 if (RenderView* view = node->document().renderView()) { 232 if (shouldRepaintCaret(view, node->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable))) 233 repaintCaretForLocalRect(node, localCaretRectWithoutUpdate()); 234 } 235 } 236 237 void CaretBase::paintCaret(Node* node, GraphicsContext* context, const LayoutPoint& paintOffset, const LayoutRect& clipRect) const 238 { 239 if (m_caretVisibility == Hidden) 240 return; 241 242 LayoutRect drawingRect = localCaretRectWithoutUpdate(); 243 RenderObject* renderer = caretRenderer(node); 244 if (renderer && renderer->isBox()) 245 toRenderBox(renderer)->flipForWritingMode(drawingRect); 246 drawingRect.moveBy(roundedIntPoint(paintOffset)); 247 LayoutRect caret = intersection(drawingRect, clipRect); 248 if (caret.isEmpty()) 249 return; 250 251 Color caretColor = Color::black; 252 253 Element* element; 254 if (node->isElementNode()) 255 element = toElement(node); 256 else 257 element = node->parentElement(); 258 259 if (element && element->renderer()) 260 caretColor = element->renderer()->resolveColor(CSSPropertyColor); 261 262 context->fillRect(caret, caretColor); 263 } 264 265 void DragCaretController::paintDragCaret(LocalFrame* frame, GraphicsContext* p, const LayoutPoint& paintOffset, const LayoutRect& clipRect) const 266 { 267 if (m_position.deepEquivalent().deprecatedNode()->document().frame() == frame) 268 paintCaret(m_position.deepEquivalent().deprecatedNode(), p, paintOffset, clipRect); 269 } 270 271 } 272