More or less implement RenderTextHarfBuzz

ui/views/examples/multiline_example.cc

 // Copyright 2013 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 "ui/views/examples/multiline_example.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/events/event.h"
 #include "ui/gfx/render_text.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/button/checkbox.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/controls/textfield/textfield.h"
 #include "ui/views/layout/grid_layout.h"
 #include "ui/views/view.h"
 
 using base::ASCIIToUTF16;
 
 namespace views {
 namespace examples {
 
+namespace {
+
+gfx::Range ClampRange(gfx::Range range, size_t max) {

[sky, 2014/05/21 16:16:38]

const gfx::Range&

+  range.set_start(std::min(range.start(), max));
+  range.set_end(std::min(range.end(), max));
+  return range;
+}
+
+}  // namespace
+
 // A simple View that hosts a RenderText object.
 class MultilineExample::RenderTextView : public View {
  public:
   RenderTextView() : render_text_(gfx::RenderText::CreateInstance()) {
     render_text_->SetHorizontalAlignment(gfx::ALIGN_CENTER);
     render_text_->SetColor(SK_ColorBLACK);
     render_text_->SetMultiline(true);
     SetBorder(Border::CreateSolidBorder(2, SK_ColorGRAY));
   }
 
@@ skipping 21 matching lines @@
     gfx::Rect rect = old_rect;
     rect.set_width(w - GetInsets().width());
     render_text_->SetDisplayRect(rect);
     int height = render_text_->GetStringSize().height() + GetInsets().height();
     render_text_->SetDisplayRect(old_rect);
     return height;
   }
 
   void SetText(const base::string16& new_contents) {
     // Color and style the text inside |test_range| to test colors and styles.
-    gfx::Range test_range(1, 21);
-    test_range.set_start(std::min(test_range.start(), new_contents.length()));
-    test_range.set_end(std::min(test_range.end(), new_contents.length()));
+    const size_t range_max = new_contents.length();
+    gfx::Range color_range = ClampRange(gfx::Range(1, 21), range_max);
+    gfx::Range bold_range = ClampRange(gfx::Range(4, 10), range_max);
+    gfx::Range italic_range = ClampRange(gfx::Range(7, 13), range_max);
 
     render_text_->SetText(new_contents);
     render_text_->SetColor(SK_ColorBLACK);
-    render_text_->ApplyColor(0xFFFF0000, test_range);
+    render_text_->ApplyColor(0xFFFF0000, color_range);
     render_text_->SetStyle(gfx::DIAGONAL_STRIKE, false);
-    render_text_->ApplyStyle(gfx::DIAGONAL_STRIKE, true, test_range);
+    render_text_->ApplyStyle(gfx::DIAGONAL_STRIKE, true, color_range);
     render_text_->SetStyle(gfx::UNDERLINE, false);
-    render_text_->ApplyStyle(gfx::UNDERLINE, true, test_range);
+    render_text_->ApplyStyle(gfx::UNDERLINE, true, color_range);
+    render_text_->ApplyStyle(gfx::BOLD, true, bold_range);
+    render_text_->ApplyStyle(gfx::ITALIC, true, italic_range);
     InvalidateLayout();
   }
 
  private:
   virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE {
     gfx::Rect bounds = GetLocalBounds();
     bounds.Inset(GetInsets());
     render_text_->SetDisplayRect(bounds);
   }
 
   scoped_ptr<gfx::RenderText> render_text_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextView);
 };
 
 MultilineExample::MultilineExample()
     : ExampleBase("Multiline RenderText"),
       render_text_view_(NULL),
       label_(NULL),
       textfield_(NULL),
       label_checkbox_(NULL) {
 }
 
 MultilineExample::~MultilineExample() {
 }
 
 void MultilineExample::CreateExampleView(View* container) {
-  const char kTestString[] = "test string asdf 1234 test string asdf 1234 "
-                             "test string asdf 1234 test string asdf 1234";
+  const base::string16 kTestString = base::WideToUTF16(L"qwerty"
+      L"\x627\x644\x631\x626\x64A\x633\x64A\x629"
+      L"asdfgh");
 
   render_text_view_ = new RenderTextView();
-  render_text_view_->SetText(ASCIIToUTF16(kTestString));
+  render_text_view_->SetText(kTestString);
 
   label_ = new Label();
-  label_->SetText(ASCIIToUTF16(kTestString));
+  label_->SetText(kTestString);
   label_->SetMultiLine(true);
   label_->SetBorder(Border::CreateSolidBorder(2, SK_ColorCYAN));
 
   label_checkbox_ = new Checkbox(ASCIIToUTF16("views::Label:"));
   label_checkbox_->SetChecked(true);
   label_checkbox_->set_listener(this);
   label_checkbox_->set_request_focus_on_press(false);
 
   textfield_ = new Textfield();
   textfield_->set_controller(this);
-  textfield_->SetText(ASCIIToUTF16(kTestString));
+  textfield_->SetText(kTestString);
 
   GridLayout* layout = new GridLayout(container);
   container->SetLayoutManager(layout);
 
   ColumnSet* column_set = layout->AddColumnSet(0);
   column_set->AddColumn(GridLayout::LEADING, GridLayout::CENTER,
       0.0f, GridLayout::USE_PREF, 0, 0);
   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
       1.0f, GridLayout::FIXED, 0, 0);
 
@@ skipping 27 matching lines @@
 void MultilineExample::ButtonPressed(Button* sender, const ui::Event& event) {
   DCHECK_EQ(sender, label_checkbox_);
   label_->SetText(label_checkbox_->checked() ? textfield_->text() :
                                                base::string16());
   container()->Layout();
   container()->SchedulePaint();
 }
 
 }  // namespace examples
 }  // namespace views