ui/views/examples/scroll_view_example.cc

   1 // Copyright (c) 2011 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 #include "ui/views/examples/scroll_view_example.h"
   6
   7 #include "base/strings/stringprintf.h"
   8 #include "base/strings/utf_string_conversions.h"
   9 #include "ui/views/background.h"
  10 #include "ui/views/controls/button/label_button.h"
  11 #include "ui/views/controls/button/radio_button.h"
  12 #include "ui/views/layout/grid_layout.h"
  13 #include "ui/views/view.h"
  14
  15 using base::ASCIIToUTF16;
  16
  17 namespace views {
  18 namespace examples {
  19
  20 // ScrollView's content, which draws gradient color on background.
  21 // TODO(oshima): add child views as well.
  22 class ScrollViewExample::ScrollableView : public View {
  23  public:
  24   ScrollableView() {
  25     SetColor(SK_ColorRED, SK_ColorCYAN);
  26     AddChildView(new LabelButton(NULL, ASCIIToUTF16("Button")));
  27     AddChildView(new RadioButton(ASCIIToUTF16("Radio Button"), 0));
  28   }
  29
  30   gfx::Size GetPreferredSize() const override {
  31     return gfx::Size(width(), height());
  32   }
  33
  34   void SetColor(SkColor from, SkColor to) {
  35     set_background(Background::CreateVerticalGradientBackground(from, to));
  36   }
  37
  38   void PlaceChildY(int index, int y) {
  39     View* view = child_at(index);
  40     gfx::Size size = view->GetPreferredSize();
  41     view->SetBounds(0, y, size.width(), size.height());
  42   }
  43
  44   void Layout() override {
  45     PlaceChildY(0, 0);
  46     PlaceChildY(1, height() / 2);
  47     SizeToPreferredSize();
  48   }
  49
  50  private:
  51   DISALLOW_COPY_AND_ASSIGN(ScrollableView);
  52 };
  53
  54 ScrollViewExample::ScrollViewExample() : ExampleBase("Scroll View") {
  55 }
  56
  57 ScrollViewExample::~ScrollViewExample() {
  58 }
  59
  60 void ScrollViewExample::CreateExampleView(View* container) {
  61   wide_ = new LabelButton(this, ASCIIToUTF16("Wide"));
  62   tall_ = new LabelButton(this, ASCIIToUTF16("Tall"));
  63   big_square_ = new LabelButton(this, ASCIIToUTF16("Big Square"));
  64   small_square_ = new LabelButton(this, ASCIIToUTF16("Small Square"));
  65   scroll_to_ = new LabelButton(this, ASCIIToUTF16("Scroll to"));
  66   scrollable_ = new ScrollableView();
  67   scroll_view_ = new ScrollView();
  68   scroll_view_->SetContents(scrollable_);
  69   scrollable_->SetBounds(0, 0, 1000, 100);
  70   scrollable_->SetColor(SK_ColorYELLOW, SK_ColorCYAN);
  71
  72   GridLayout* layout = new GridLayout(container);
  73   container->SetLayoutManager(layout);
  74
  75   // Add scroll view.
  76   ColumnSet* column_set = layout->AddColumnSet(0);
  77   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
  78                         GridLayout::USE_PREF, 0, 0);
  79   layout->StartRow(1, 0);
  80   layout->AddView(scroll_view_);
  81
  82   // Add control buttons.
  83   column_set = layout->AddColumnSet(1);
  84   for (int i = 0; i < 5; i++) {
  85     column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
  86                           GridLayout::USE_PREF, 0, 0);
  87   }
  88   layout->StartRow(0, 1);
  89   layout->AddView(wide_);
  90   layout->AddView(tall_);
  91   layout->AddView(big_square_);
  92   layout->AddView(small_square_);
  93   layout->AddView(scroll_to_);
  94 }
  95
  96 void ScrollViewExample::ButtonPressed(Button* sender, const ui::Event& event) {
  97   if (sender == wide_) {
  98     scrollable_->SetBounds(0, 0, 1000, 100);
  99     scrollable_->SetColor(SK_ColorYELLOW, SK_ColorCYAN);
 100   } else if (sender == tall_) {
 101     scrollable_->SetBounds(0, 0, 100, 1000);
 102     scrollable_->SetColor(SK_ColorRED, SK_ColorCYAN);
 103   } else if (sender == big_square_) {
 104     scrollable_->SetBounds(0, 0, 1000, 1000);
 105     scrollable_->SetColor(SK_ColorRED, SK_ColorGREEN);
 106   } else if (sender == small_square_) {
 107     scrollable_->SetBounds(0, 0, 100, 100);
 108     scrollable_->SetColor(SK_ColorYELLOW, SK_ColorGREEN);
 109   } else if (sender == scroll_to_) {
 110     scroll_view_->contents()->ScrollRectToVisible(
 111         gfx::Rect(20, 500, 1000, 500));
 112   }
 113   scroll_view_->Layout();
 114 }
 115
 116 }  // namespace examples
 117 }  // namespace views