/*
* Copyright (C) 2005, 2007, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
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* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/core/editing/substring_util.h"
#import <Cocoa/Cocoa.h>
#include "base/apple/bridging.h"
#include "base/apple/scoped_cftyperef.h"
#include "third_party/blink/renderer/core/css/properties/longhands.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/node.h"
#include "third_party/blink/renderer/core/editing/editor.h"
#include "third_party/blink/renderer/core/editing/ephemeral_range.h"
#include "third_party/blink/renderer/core/editing/frame_selection.h"
#include "third_party/blink/renderer/core/editing/iterators/text_iterator.h"
#include "third_party/blink/renderer/core/editing/plain_text_range.h"
#include "third_party/blink/renderer/core/editing/selection_template.h"
#include "third_party/blink/renderer/core/editing/visible_selection.h"
#include "third_party/blink/renderer/core/editing/visible_units.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/local_frame_view.h"
#include "third_party/blink/renderer/core/frame/visual_viewport.h"
#include "third_party/blink/renderer/core/frame/web_frame_widget_impl.h"
#include "third_party/blink/renderer/core/html/html_element.h"
#include "third_party/blink/renderer/core/layout/hit_test_result.h"
#include "third_party/blink/renderer/core/layout/layout_object.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/fonts/font.h"
#include "third_party/blink/renderer/platform/mac/color_mac.h"
namespace blink {
namespace {
NSString* const kCrBaselineOffset = @"kCrBaselineOffset";
NSAttributedString* AttributedSubstringFromRange(LocalFrame* frame,
const EphemeralRange& range) {
NSMutableAttributedString* string = [[NSMutableAttributedString alloc] init];
NSMutableDictionary* attrs = [NSMutableDictionary dictionary];
size_t length = range.EndPosition().ComputeOffsetInContainerNode() -
range.StartPosition().ComputeOffsetInContainerNode();
unsigned position = 0;
// TODO(editing-dev): The use of updateStyleAndLayout
// needs to be audited. see http://crbug.com/590369 for more details.
range.StartPosition().GetDocument()->UpdateStyleAndLayout(
DocumentUpdateReason::kEditing);
for (TextIterator it(range.StartPosition(), range.EndPosition());
!it.AtEnd() && [string length] < length; it.Advance()) {
unsigned num_characters = it.length();
if (!num_characters) {
continue;
}
const Node& container = it.CurrentContainer();
const LayoutObject* layout_object = container.GetLayoutObject();
if (!layout_object) {
continue;
}
// There are two ways that the size of text can be affected by the user. One
// is the page scale factor, which is what the user changes by pinching on
// the trackpad. The other is zooming, which combines 1. the effect of users
// using ⌘+/⌘- and 2. implementing the device scale factor (this is an
// implementation feature called "zoom-for-dsf"). The zoom value is baked
// into the font size, so to calculate the font size needed for display, the
// device scale factor must be divided out from the font size and the page
// scale factor must be multiplied in.
const ComputedStyle* style = layout_object->Style();
const SimpleFontData* primaryFont = style->GetFont().PrimaryFont();
const FontPlatformData& font_platform_data = primaryFont->PlatformData();
const float page_scale_factor = frame->GetPage()->PageScaleFactor();
const float device_scale_factor =
frame->GetWidgetForLocalRoot()->DIPsToBlinkSpace(1.0f);
attrs[kCrBaselineOffset] =
@(primaryFont->GetFontMetrics().Descent() * page_scale_factor);
NSFont* original_font =
base::apple::CFToNSPtrCast(font_platform_data.CtFont());
const CGFloat desired_size =
font_platform_data.size() * page_scale_factor / device_scale_factor;
NSFont* font = nil;
if (original_font) {
font = [original_font fontWithSize:desired_size];
}
// If the platform font can't be loaded, or the size is incorrect comparing
// to the computed style, it's likely that the site is using a web font.
// For now, just use the default font instead.
// TODO(rsesek): Change the font activation flags to allow other processes
// to use the font.
// TODO(shuchen): Support scaling the font as necessary according to CSS
// transforms, not just pinch-zoom.
if (!font || floor(font_platform_data.size()) !=
floor(original_font.fontDescriptor.pointSize)) {
font = [NSFont systemFontOfSize:style->GetFont()
.GetFontDescription()
.ComputedSize() *
page_scale_factor / device_scale_factor];
}
attrs[NSFontAttributeName] = font;
if (!style->VisitedDependentColor(GetCSSPropertyColor())
.IsFullyTransparent()) {
attrs[NSForegroundColorAttributeName] =
NsColor(style->VisitedDependentColor(GetCSSPropertyColor()));
} else {
[attrs removeObjectForKey:NSForegroundColorAttributeName];
}
if (!style->VisitedDependentColor(GetCSSPropertyBackgroundColor())
.IsFullyTransparent()) {
attrs[NSBackgroundColorAttributeName] = NsColor(
style->VisitedDependentColor(GetCSSPropertyBackgroundColor()));
} else {
[attrs removeObjectForKey:NSBackgroundColorAttributeName];
}
NSString* substring = it.GetTextState().GetTextForTesting();
[string replaceCharactersInRange:NSMakeRange(position, 0)
withString:substring];
[string setAttributes:attrs range:NSMakeRange(position, num_characters)];
position += num_characters;
}
return string;
}
gfx::Point GetBaselinePoint(LocalFrameView* frame_view,
const EphemeralRange& range,
NSAttributedString* string) {
gfx::Rect string_rect = frame_view->FrameToViewport(FirstRectForRange(range));
gfx::Point string_point = string_rect.bottom_left();
// Adjust for the font's descender. AppKit wants the baseline point.
if (string.length) {
NSDictionary* attributes = [string attributesAtIndex:0
effectiveRange:nullptr];
if (NSNumber* descender = attributes[kCrBaselineOffset]) {
string_point.Offset(0, -ceil(descender.doubleValue));
}
}
return string_point;
}
} // namespace
base::apple::ScopedCFTypeRef<CFAttributedStringRef>
SubstringUtil::AttributedWordAtPoint(WebFrameWidgetImpl* frame_widget,
gfx::Point point,
gfx::Point& baseline_point) {
HitTestResult result = frame_widget->CoreHitTestResultAt(gfx::PointF(point));
if (!result.InnerNode()) {
return base::apple::ScopedCFTypeRef<CFAttributedStringRef>();
}
LocalFrame* frame = result.InnerNode()->GetDocument().GetFrame();
EphemeralRange range =
frame->GetEditor().RangeForPoint(result.RoundedPointInInnerNodeFrame());
if (range.IsNull()) {
return base::apple::ScopedCFTypeRef<CFAttributedStringRef>();
}
// Expand to word under point.
const SelectionInDOMTree selection = ExpandWithGranularity(
SelectionInDOMTree::Builder().SetBaseAndExtent(range).Build(),
TextGranularity::kWord);
const EphemeralRange word_range = NormalizeRange(selection);
// Convert to CFAttributedStringRef.
NSAttributedString* string = AttributedSubstringFromRange(frame, word_range);
baseline_point = GetBaselinePoint(frame->View(), word_range, string);
return base::apple::ScopedCFTypeRef<CFAttributedStringRef>(
base::apple::NSToCFOwnershipCast(string));
}
base::apple::ScopedCFTypeRef<CFAttributedStringRef>
SubstringUtil::AttributedSubstringInRange(LocalFrame* frame,
wtf_size_t location,
wtf_size_t length,
gfx::Point& baseline_point) {
frame->View()->UpdateStyleAndLayout();
Element* editable = frame->Selection().RootEditableElementOrDocumentElement();
if (!editable) {
return base::apple::ScopedCFTypeRef<CFAttributedStringRef>();
}
const EphemeralRange ephemeral_range(
PlainTextRange(location, location + length).CreateRange(*editable));
if (ephemeral_range.IsNull()) {
return base::apple::ScopedCFTypeRef<CFAttributedStringRef>();
}
NSAttributedString* string =
AttributedSubstringFromRange(frame, ephemeral_range);
baseline_point = GetBaselinePoint(frame->View(), ephemeral_range, string);
return base::apple::ScopedCFTypeRef<CFAttributedStringRef>(
base::apple::NSToCFOwnershipCast(string));
}
} // namespace blink
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