Prepare to use gfx::RenderText in views::Label.

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"
@@ skipping 10 matching lines @@
 namespace examples {
 
 namespace {
 
 gfx::Range ClampRange(gfx::Range range, size_t max) {
   range.set_start(std::min(range.start(), max));
   range.set_end(std::min(range.end(), max));
   return range;
 }
 
+// A Label with a clamped preferred width to demonstrate wrapping.
+class PreferredSizeLabel : public Label {
+ public:
+  PreferredSizeLabel() : Label() {}
+  virtual ~PreferredSizeLabel() {}
+
+  // Label:
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
+    return gfx::Size(50, Label::GetPreferredSize().height());
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PreferredSizeLabel);
+};
+
 }  // 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 71 matching lines @@
 }
 
 void MultilineExample::CreateExampleView(View* container) {
   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(kTestString);
 
-  label_ = new Label();
+  label_ = new PreferredSizeLabel();
   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();
@@ skipping 24 matching lines @@
 
 void MultilineExample::ContentsChanged(Textfield* sender,
                                        const base::string16& new_contents) {
   render_text_view_->SetText(new_contents);
   if (label_checkbox_->checked())
     label_->SetText(new_contents);
   container()->Layout();
   container()->SchedulePaint();
 }
 
-bool MultilineExample::HandleKeyEvent(Textfield* sender,
-                                      const ui::KeyEvent& key_event) {
-  return false;
-}
-
 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