views/examples/widget_example.h

   1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef VIEWS_EXAMPLES_WIDGET_EXAMPLE_H_
   6 #define VIEWS_EXAMPLES_WIDGET_EXAMPLE_H_
   7
   8 #include "views/background.h"
   9 #include "views/controls/button/text_button.h"
  10 #include "views/examples/example_base.h"
  11 #include "views/fill_layout.h"
  12 #include "views/view.h"
  13 #include "views/widget/root_view.h"
  14 #include "views/widget/widget.h"
  15
  16 namespace examples {
  17
  18 // WidgetExample demonstrates how to create a popup widget.
  19 class WidgetExample : public ExampleBase, public views::ButtonListener {
  20  public:
  21   explicit WidgetExample(ExamplesMain* main) : ExampleBase(main) {
  22   }
  23
  24   virtual ~WidgetExample() {}
  25
  26   virtual std::wstring GetExampleTitle() {
  27     return L"Widget";
  28   }
  29
  30   virtual void CreateExampleView(views::View* container) {
  31     create_button_ = new views::TextButton(this, L"Create a popup widget");
  32     container->SetLayoutManager(new views::FillLayout);
  33     container->AddChildView(create_button_);
  34     // We'll create close_button_ and popup_widget_, when the create button
  35     // is clicked.
  36     close_button_ = NULL;
  37     popup_widget_ = NULL;
  38   }
  39
  40  private:
  41   // ButtonListner implementation.
  42   virtual void ButtonPressed(views::Button* sender, const views::Event& event) {
  43     if (sender == create_button_) {
  44       // Disable the create button.
  45       create_button_->SetEnabled(false);
  46
  47       // Create a popup widget.
  48       popup_widget_ = views::Widget::CreatePopupWidget(
  49         views::Widget::NotTransparent,
  50         views::Widget::AcceptEvents,
  51         views::Widget::DeleteOnDestroy);
  52
  53       // Compute where to place the popup widget.
  54       // We'll place it right below the create_button_.
  55       gfx::Point point = create_button_->GetPosition();
  56       // The position in point is relative to the parent. Make it absolute.
  57       views::View::ConvertPointToScreen(create_button_, &point);
  58       // Add the height of create_button_.
  59       point.Offset(0, create_button_->size().height());
  60       gfx::Rect bounds(point.x(), point.y(), 200, 300);
  61
  62       // Initialize the popup widget with the computed bounds.
  63       popup_widget_->Init(NULL, bounds);
  64
  65       // Add a button to close the popup widget.
  66       close_button_ = new views::TextButton(this, L"Close");
  67       views::View* widget_container = new views::View;
  68       widget_container->SetLayoutManager(new views::FillLayout);
  69       widget_container->set_background(
  70         views::Background::CreateStandardPanelBackground());
  71       widget_container->AddChildView(close_button_);
  72       popup_widget_->GetRootView()->SetContentsView(widget_container);
  73
  74       // Show the popup widget.
  75       popup_widget_->Show();
  76     } else if (sender == close_button_) {
  77       // Close the popup widget. This will delete popup_widget_ as
  78       // DeleteOnDestroy is specified when the widget was created.
  79       // Views on the widget will also be deleted.
  80       popup_widget_->Close();
  81       // Re-enable the create button.
  82       create_button_->SetEnabled(true);
  83       close_button_ = NULL;
  84       popup_widget_ = NULL;
  85     }
  86   }
  87
  88   views::TextButton* create_button_;
  89   views::TextButton* close_button_;
  90   views::Widget* popup_widget_;
  91
  92   DISALLOW_COPY_AND_ASSIGN(WidgetExample);
  93 };
  94
  95 }  // namespace examples
  96
  97 #endif  // VIEWS_EXAMPLES_WIDGET_EXAMPLE_H_
  98