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