Add a DialogExample example to views_examples

ui/views/examples/dialog_example.h

Index: ui/views/examples/dialog_example.h
diff --git a/ui/views/examples/dialog_example.h b/ui/views/examples/dialog_example.h
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+// Copyright 2017 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.
+
+#ifndef UI_VIEWS_EXAMPLES_DIALOG_EXAMPLE_H_
+#define UI_VIEWS_EXAMPLES_DIALOG_EXAMPLE_H_
+
+#include "base/macros.h"
+#include "ui/base/models/simple_combobox_model.h"
+#include "ui/views/controls/button/button.h"
+#include "ui/views/controls/combobox/combobox_listener.h"
+#include "ui/views/controls/textfield/textfield_controller.h"
+#include "ui/views/examples/example_base.h"
+
+namespace views {
+
+class Checkbox;
+class Combobox;
+class DialogDelegate;
+class GridLayout;
+class Label;
+class LabelButton;
+class Textfield;
+
+namespace examples {
+
+// An example that exercises BubbleDialogDelegateView or DialogDelegateView.
+class VIEWS_EXAMPLES_EXPORT DialogExample : public ExampleBase,
+                                            public ButtonListener,
+                                            public TextfieldController,
+                                            public ComboboxListener {
+ public:
+  DialogExample();
+  ~DialogExample() override;
+
+  // ExampleBase:
+  void CreateExampleView(View* container) override;
+
+ private:
+  template <class>
+  class Delegate;
+  class Bubble;
+  class Dialog;
+
+  // Helper methods to setup the configuration Views.
+  void StartRowWithLabel(GridLayout* layout, const char* label);
+  void StartTextfieldRow(GridLayout* layout,
+                         Textfield** member,
+                         const char* label,
+                         const char* value);
+  void AddCheckbox(GridLayout* layout, Checkbox** member);
+
+  // Interrogates the configuration Views for DialogDelegate.
+  ui::ModalType GetModalType() const;
+  int GetDialogButtons() const;
+
+  // Invoked when the dialog is closing.
+  bool AllowDialogClose(bool accept);
+
+  // Resize the dialog Widget to match the preferred size. Triggers Layout().
+  void ResizeDialog();
+
+  // ButtonListener:
+  void ButtonPressed(Button* sender, const ui::Event& event) override;
+
+  // TextfieldController:
+  void ContentsChanged(Textfield* sender,
+                       const base::string16& new_contents) override;
+
+  // ComboboxListener:
+  void OnPerformAction(Combobox* combobox) override;
+
+  DialogDelegate* last_dialog_ = nullptr;
+  Label* last_body_label_ = nullptr;
+
+  Textfield* title_;
+  Textfield* body_;
+  Textfield* ok_button_label_;
+  Checkbox* has_ok_button_;
+  Textfield* cancel_button_label_;
+  Checkbox* has_cancel_button_;
+  Textfield* extra_button_label_;
+  Checkbox* has_extra_button_;
+  Combobox* mode_;
+  Checkbox* bubble_;
+  Checkbox* persistent_bubble_;
+  LabelButton* show_;
+  ui::SimpleComboboxModel mode_model_;
+
+  DISALLOW_COPY_AND_ASSIGN(DialogExample);
+};
+
+}  // namespace examples
+}  // namespace views
+
+#endif  // UI_VIEWS_EXAMPLES_DIALOG_EXAMPLE_H_