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      1 /*
      2  * Copyright (C) 2005, 2007, 2008 Apple Inc. All rights reserved.
      3  * Copyright (C) 2011 Google Inc. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "config.h"
     33 #include "public/web/mac/WebSubstringUtil.h"
     34 
     35 #import <Cocoa/Cocoa.h>
     36 
     37 #include "bindings/v8/ExceptionStatePlaceholder.h"
     38 #include "core/dom/Document.h"
     39 #include "core/dom/Element.h"
     40 #include "core/dom/Node.h"
     41 #include "core/dom/Range.h"
     42 #include "core/editing/FrameSelection.h"
     43 #include "core/editing/PlainTextRange.h"
     44 #include "core/editing/TextIterator.h"
     45 #include "core/frame/FrameView.h"
     46 #include "core/frame/LocalFrame.h"
     47 #include "core/html/HTMLElement.h"
     48 #include "core/rendering/HitTestResult.h"
     49 #include "core/rendering/RenderObject.h"
     50 #include "core/rendering/style/RenderStyle.h"
     51 #include "platform/fonts/Font.h"
     52 #include "platform/mac/ColorMac.h"
     53 #include "public/platform/WebRect.h"
     54 #include "public/web/WebHitTestResult.h"
     55 #include "public/web/WebRange.h"
     56 #include "public/web/WebView.h"
     57 #include "web/WebLocalFrameImpl.h"
     58 
     59 using namespace WebCore;
     60 
     61 static NSAttributedString* attributedSubstringFromRange(const Range* range)
     62 {
     63     NSMutableAttributedString* string = [[NSMutableAttributedString alloc] init];
     64     NSMutableDictionary* attrs = [NSMutableDictionary dictionary];
     65     size_t length = range->endOffset() - range->startOffset();
     66 
     67     unsigned position = 0;
     68     for (TextIterator it(range); !it.atEnd() && [string length] < length; it.advance()) {
     69         unsigned numCharacters = it.length();
     70         if (!numCharacters)
     71             continue;
     72 
     73         Node* container = it.range()->startContainer();
     74         RenderObject* renderer = container->renderer();
     75         ASSERT(renderer);
     76         if (!renderer)
     77             continue;
     78 
     79         RenderStyle* style = renderer->style();
     80         NSFont* font = style->font().primaryFont()->getNSFont();
     81         // If the platform font can't be loaded, it's likely that the site is
     82         // using a web font. For now, just use the default font instead.
     83         // TODO(rsesek): Change the font activation flags to allow other processes
     84         // to use the font.
     85         if (!font)
     86           font = [NSFont systemFontOfSize:style->font().fontDescription().computedSize()];
     87         [attrs setObject:font forKey:NSFontAttributeName];
     88 
     89         if (style->visitedDependentColor(CSSPropertyColor).alpha())
     90             [attrs setObject:nsColor(style->visitedDependentColor(CSSPropertyColor)) forKey:NSForegroundColorAttributeName];
     91         else
     92             [attrs removeObjectForKey:NSForegroundColorAttributeName];
     93         if (style->visitedDependentColor(CSSPropertyBackgroundColor).alpha())
     94             [attrs setObject:nsColor(style->visitedDependentColor(CSSPropertyBackgroundColor)) forKey:NSBackgroundColorAttributeName];
     95         else
     96             [attrs removeObjectForKey:NSBackgroundColorAttributeName];
     97 
     98         Vector<UChar> characters;
     99         it.appendTextTo(characters);
    100         NSString* substring =
    101             [[[NSString alloc] initWithCharacters:characters.data()
    102                                            length:characters.size()] autorelease];
    103         [string replaceCharactersInRange:NSMakeRange(position, 0)
    104                               withString:substring];
    105         [string setAttributes:attrs range:NSMakeRange(position, numCharacters)];
    106         position += numCharacters;
    107     }
    108     return [string autorelease];
    109 }
    110 
    111 namespace blink {
    112 
    113 NSAttributedString* WebSubstringUtil::attributedWordAtPoint(WebView* view, WebPoint point, WebPoint& baselinePoint)
    114 {
    115     HitTestResult result = view->hitTestResultAt(point);
    116     if (!result.targetNode())
    117       return nil;
    118     LocalFrame* frame = result.targetNode()->document().frame();
    119     FrameView* frameView = frame->view();
    120 
    121     RefPtrWillBeRawPtr<Range> range = frame->rangeForPoint(result.roundedPointInInnerNodeFrame());
    122     if (!range)
    123         return nil;
    124 
    125     // Expand to word under point.
    126     VisibleSelection selection(range.get());
    127     selection.expandUsingGranularity(WordGranularity);
    128     RefPtrWillBeRawPtr<Range> wordRange = selection.toNormalizedRange();
    129 
    130     // Convert to NSAttributedString.
    131     NSAttributedString* string = attributedSubstringFromRange(wordRange.get());
    132 
    133     // Compute bottom left corner and convert to AppKit coordinates.
    134     IntRect stringRect = enclosingIntRect(wordRange->boundingRect());
    135     IntPoint stringPoint = stringRect.minXMaxYCorner();
    136     stringPoint.setY(frameView->height() - stringPoint.y());
    137 
    138     // Adjust for the font's descender. AppKit wants the baseline point.
    139     if ([string length]) {
    140         NSDictionary* attributes = [string attributesAtIndex:0 effectiveRange:NULL];
    141         NSFont* font = [attributes objectForKey:NSFontAttributeName];
    142         if (font)
    143             stringPoint.move(0, ceil(-[font descender]));
    144     }
    145 
    146     baselinePoint = stringPoint;
    147     return string;
    148 }
    149 
    150 NSAttributedString* WebSubstringUtil::attributedSubstringInRange(WebLocalFrame* webFrame, size_t location, size_t length)
    151 {
    152     LocalFrame* frame = toWebLocalFrameImpl(webFrame)->frame();
    153     if (frame->view()->needsLayout())
    154         frame->view()->layout();
    155 
    156     Element* editable = frame->selection().rootEditableElementOrDocumentElement();
    157     ASSERT(editable);
    158     RefPtrWillBeRawPtr<Range> range(PlainTextRange(location, location + length).createRange(*editable));
    159     if (!range)
    160         return nil;
    161 
    162     return attributedSubstringFromRange(range.get());
    163 }
    164 
    165 } // namespace blink
    166