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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include "build/build_config.h"
#include "cc/paint/paint_canvas.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/render_text.h"
#include "ui/gfx/skia_util.h"
#include "ui/gfx/text_elider.h"
#include "ui/gfx/text_utils.h"
namespace gfx {
namespace {
// Strips accelerator character prefixes in |text| if needed, based on |flags|.
// Returns a range in |text| to underline or Range::InvalidRange() if
// underlining is not needed.
Range StripAcceleratorChars(int flags, std::u16string* text) {
if (flags & Canvas::SHOW_PREFIX) {
int char_pos = -1;
int char_span = 0;
*text = LocateAndRemoveAcceleratorChar(*text, &char_pos, &char_span);
if (char_pos != -1)
return Range(char_pos, char_pos + char_span);
} else if (flags & Canvas::HIDE_PREFIX) {
*text = RemoveAccelerator(*text);
}
return Range::InvalidRange();
}
// Elides |text| and adjusts |range| appropriately. If eliding causes |range|
// to no longer point to the same character in |text|, |range| is made invalid.
void ElideTextAndAdjustRange(const FontList& font_list,
float width,
std::u16string* text,
Range* range) {
const char16_t start_char =
(range->IsValid() ? text->at(range->start()) : u'\0');
*text = ElideText(*text, font_list, width, ELIDE_TAIL);
if (!range->IsValid())
return;
if (range->start() >= text->length() ||
text->at(range->start()) != start_char) {
*range = Range::InvalidRange();
}
}
// Updates |render_text| from the specified parameters.
void UpdateRenderText(const Rect& rect,
const std::u16string& text,
const FontList& font_list,
int flags,
SkColor color,
RenderText* render_text) {
render_text->SetFontList(font_list);
render_text->SetText(text);
render_text->SetCursorEnabled(false);
render_text->SetDisplayRect(rect);
// Set the text alignment explicitly based on the directionality of the UI,
// if not specified.
if (!(flags & (Canvas::TEXT_ALIGN_CENTER |
Canvas::TEXT_ALIGN_RIGHT |
Canvas::TEXT_ALIGN_LEFT |
Canvas::TEXT_ALIGN_TO_HEAD))) {
flags |= Canvas::DefaultCanvasTextAlignment();
}
if (flags & Canvas::TEXT_ALIGN_TO_HEAD)
render_text->SetHorizontalAlignment(ALIGN_TO_HEAD);
else if (flags & Canvas::TEXT_ALIGN_RIGHT)
render_text->SetHorizontalAlignment(ALIGN_RIGHT);
else if (flags & Canvas::TEXT_ALIGN_CENTER)
render_text->SetHorizontalAlignment(ALIGN_CENTER);
else
render_text->SetHorizontalAlignment(ALIGN_LEFT);
render_text->set_subpixel_rendering_suppressed(
(flags & Canvas::NO_SUBPIXEL_RENDERING) != 0);
render_text->SetColor(color);
const int font_style = font_list.GetFontStyle();
render_text->SetStyle(TEXT_STYLE_ITALIC, (font_style & Font::ITALIC) != 0);
render_text->SetStyle(TEXT_STYLE_UNDERLINE,
(font_style & Font::UNDERLINE) != 0);
render_text->SetWeight(font_list.GetFontWeight());
}
} // namespace
// static
void Canvas::SizeStringFloat(const std::u16string& text,
const FontList& font_list,
float* width,
float* height,
int line_height,
int flags) {
DCHECK_GE(*width, 0);
DCHECK_GE(*height, 0);
if ((flags & MULTI_LINE) && *width != 0) {
WordWrapBehavior wrap_behavior = TRUNCATE_LONG_WORDS;
if (flags & CHARACTER_BREAKABLE)
wrap_behavior = WRAP_LONG_WORDS;
else if (!(flags & NO_ELLIPSIS))
wrap_behavior = ELIDE_LONG_WORDS;
std::vector<std::u16string> strings;
ElideRectangleText(text, font_list, *width, INT_MAX, wrap_behavior,
&strings);
Rect rect(base::saturated_cast<int>(*width), INT_MAX);
std::unique_ptr<RenderText> render_text = RenderText::CreateRenderText();
UpdateRenderText(rect, std::u16string(), font_list, flags, 0,
render_text.get());
float h = 0;
float w = 0;
for (size_t i = 0; i < strings.size(); ++i) {
StripAcceleratorChars(flags, &strings[i]);
render_text->SetText(strings[i]);
const SizeF& string_size = render_text->GetStringSizeF();
w = std::max(w, string_size.width());
h += (i > 0 && line_height > 0) ?
std::max(static_cast<float>(line_height), string_size.height())
: string_size.height();
}
*width = w;
*height = h;
} else {
std::unique_ptr<RenderText> render_text = RenderText::CreateRenderText();
Rect rect(base::saturated_cast<int>(*width),
base::saturated_cast<int>(*height));
std::u16string adjusted_text = text;
StripAcceleratorChars(flags, &adjusted_text);
UpdateRenderText(rect, adjusted_text, font_list, flags, 0,
render_text.get());
const SizeF& string_size = render_text->GetStringSizeF();
*width = string_size.width();
*height = string_size.height();
}
}
void Canvas::DrawStringRectWithFlags(const std::u16string& text,
const FontList& font_list,
SkColor color,
const Rect& text_bounds,
int flags) {
if (!IntersectsClipRect(RectToSkRect(text_bounds)))
return;
canvas_->save();
ClipRect(text_bounds);
Rect rect(text_bounds);
std::unique_ptr<RenderText> render_text = RenderText::CreateRenderText();
if (flags & MULTI_LINE) {
WordWrapBehavior wrap_behavior = IGNORE_LONG_WORDS;
if (flags & CHARACTER_BREAKABLE)
wrap_behavior = WRAP_LONG_WORDS;
else if (!(flags & NO_ELLIPSIS))
wrap_behavior = ELIDE_LONG_WORDS;
std::vector<std::u16string> strings;
ElideRectangleText(text, font_list,
static_cast<float>(text_bounds.width()),
text_bounds.height(), wrap_behavior, &strings);
for (size_t i = 0; i < strings.size(); i++) {
Range range = StripAcceleratorChars(flags, &strings[i]);
UpdateRenderText(rect, strings[i], font_list, flags, color,
render_text.get());
int line_padding = 0;
const int line_height = render_text->GetStringSize().height();
// TODO(msw|asvitkine): Center Windows multi-line text: crbug.com/107357
#if !defined(OS_WIN)
if (i == 0) {
// TODO(msw|asvitkine): Support multi-line text with varied heights.
const int text_height = strings.size() * line_height - line_padding;
rect += Vector2d(0, (text_bounds.height() - text_height) / 2);
}
#endif
rect.set_height(line_height - line_padding);
if (range.IsValid())
render_text->ApplyStyle(TEXT_STYLE_UNDERLINE, true, range);
render_text->SetDisplayRect(rect);
render_text->Draw(this);
rect += Vector2d(0, line_height);
}
} else {
std::u16string adjusted_text = text;
Range range = StripAcceleratorChars(flags, &adjusted_text);
bool elide_text = ((flags & NO_ELLIPSIS) == 0);
#if defined(OS_LINUX) || defined(OS_CHROMEOS)
// On Linux, eliding really means fading the end of the string. But only
// for LTR text. RTL text is still elided (on the left) with "...".
if (elide_text) {
render_text->SetText(adjusted_text);
if (render_text->GetDisplayTextDirection() == base::i18n::LEFT_TO_RIGHT) {
render_text->SetElideBehavior(FADE_TAIL);
elide_text = false;
}
}
#endif
if (elide_text) {
ElideTextAndAdjustRange(font_list,
static_cast<float>(text_bounds.width()),
&adjusted_text, &range);
}
UpdateRenderText(rect, adjusted_text, font_list, flags, color,
render_text.get());
if (range.IsValid())
render_text->ApplyStyle(TEXT_STYLE_UNDERLINE, true, range);
render_text->Draw(this);
}
canvas_->restore();
}
} // namespace gfx
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