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      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   virtual 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   virtual 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
    118