ui/views/examples/text_example.cc

   1 // Copyright (c) 2012 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/text_example.h"
   6
   7 #include "base/strings/utf_string_conversions.h"
   8 #include "ui/gfx/canvas.h"
   9 #include "ui/gfx/font_list.h"
  10 #include "ui/views/border.h"
  11 #include "ui/views/controls/button/checkbox.h"
  12 #include "ui/views/controls/combobox/combobox.h"
  13 #include "ui/views/controls/label.h"
  14 #include "ui/views/examples/example_combobox_model.h"
  15 #include "ui/views/layout/grid_layout.h"
  16 #include "ui/views/view.h"
  17
  18 namespace views {
  19 namespace examples {
  20
  21 namespace {
  22
  23 // Number of columns in the view layout.
  24 const int kNumColumns = 10;
  25
  26 const char kShortText[] = "The quick brown fox jumps over the lazy dog.";
  27 const char kLongText[] =
  28     "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod "
  29     "tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim "
  30     "veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea "
  31     "commodo consequat.\nDuis aute irure dolor in reprehenderit in voluptate "
  32     "velit esse cillum dolore eu fugiat nulla pariatur.\n\nExcepteur sint "
  33     "occaecat cupidatat non proident, sunt in culpa qui officia deserunt "
  34     "mollit anim id est laborum.";
  35 const char kAmpersandText[] =
  36     "The quick && &brown fo&x jumps over the lazy dog.";
  37 const wchar_t kRightToLeftText[] =
  38     L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd! "
  39     L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd! "
  40     L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd! "
  41     L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd! "
  42     L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd! "
  43     L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd! "
  44     L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd! "
  45     L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd!";
  46
  47 const char* kTextExamples[] = { "Short", "Long", "Ampersands", "RTL Hebrew", };
  48 const char* kElideBehaviors[] = { "Elide", "No Elide", "Fade", };
  49 const char* kPrefixOptions[] = { "Default", "Show", "Hide", };
  50 const char* kHorizontalAligments[] = { "Default", "Left", "Center", "Right", };
  51
  52 // Toggles bit |flag| on |flags| based on state of |checkbox|.
  53 void SetFlagFromCheckbox(Checkbox* checkbox, int* flags, int flag) {
  54   if (checkbox->checked())
  55     *flags |= flag;
  56   else
  57     *flags &= ~flag;
  58 }
  59
  60 }  // namespace
  61
  62 // TextExample's content view, which draws stylized string.
  63 class TextExample::TextExampleView : public View {
  64  public:
  65   TextExampleView()
  66     : text_(base::ASCIIToUTF16(kShortText)),
  67       flags_(0),
  68       halo_(false),
  69       elide_(gfx::NO_ELIDE) {
  70   }
  71
  72   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
  73     View::OnPaint(canvas);
  74     const gfx::Rect bounds = GetContentsBounds();
  75     const SkColor color = SK_ColorDKGRAY;
  76     if (elide_ == gfx::FADE_TAIL) {
  77       canvas->DrawFadedString(text_, font_list_, color, bounds, flags_);
  78     } else if (halo_) {
  79       canvas->DrawStringRectWithHalo(text_, font_list_, color, SK_ColorYELLOW,
  80                                      bounds, flags_);
  81     } else {
  82       canvas->DrawStringRectWithFlags(text_, font_list_, color, bounds, flags_);
  83     }
  84   }
  85
  86   int flags() const { return flags_; }
  87   void set_flags(int flags) { flags_ = flags; }
  88   void set_text(const base::string16& text) { text_ = text; }
  89   void set_halo(bool halo) { halo_ = halo; }
  90   void set_elide(gfx::ElideBehavior elide) { elide_ = elide; }
  91
  92   int GetStyle() const { return font_list_.GetFontStyle(); }
  93   void SetStyle(int style) { font_list_ = font_list_.DeriveWithStyle(style); }
  94
  95  private:
  96   // The font used for drawing the text.
  97   gfx::FontList font_list_;
  98
  99   // The text to draw.
 100   base::string16 text_;
 101
 102   // Text flags for passing to |DrawStringRect()|.
 103   int flags_;
 104
 105   // A flag to draw a halo around the text.
 106   bool halo_;
 107
 108   // The eliding, fading, or truncating behavior.
 109   gfx::ElideBehavior elide_;
 110
 111   DISALLOW_COPY_AND_ASSIGN(TextExampleView);
 112 };
 113
 114 TextExample::TextExample() : ExampleBase("Text Styles") {}
 115
 116 TextExample::~TextExample() {
 117   // Remove the views first as some reference combobox models.
 118   container()->RemoveAllChildViews(true);
 119 }
 120
 121 Checkbox* TextExample::AddCheckbox(GridLayout* layout, const char* name) {
 122   Checkbox* checkbox = new Checkbox(base::ASCIIToUTF16(name));
 123   checkbox->set_listener(this);
 124   layout->AddView(checkbox);
 125   return checkbox;
 126 }
 127
 128 Combobox* TextExample::AddCombobox(GridLayout* layout,
 129                                    const char* name,
 130                                    const char** strings,
 131                                    int count) {
 132   layout->StartRow(0, 0);
 133   layout->AddView(new Label(base::ASCIIToUTF16(name)));
 134   ExampleComboboxModel* model = new ExampleComboboxModel(strings, count);
 135   example_combobox_model_.push_back(model);
 136   Combobox* combobox = new Combobox(model);
 137   combobox->SetSelectedIndex(0);
 138   combobox->set_listener(this);
 139   layout->AddView(combobox, kNumColumns - 1, 1);
 140   return combobox;
 141 }
 142
 143 void TextExample::CreateExampleView(View* container) {
 144   text_view_ = new TextExampleView;
 145   text_view_->SetBorder(Border::CreateSolidBorder(1, SK_ColorGRAY));
 146   GridLayout* layout = new GridLayout(container);
 147   container->SetLayoutManager(layout);
 148   layout->AddPaddingRow(0, 8);
 149
 150   ColumnSet* column_set = layout->AddColumnSet(0);
 151   column_set->AddPaddingColumn(0, 8);
 152   column_set->AddColumn(GridLayout::LEADING, GridLayout::FILL,
 153                         0.1f, GridLayout::USE_PREF, 0, 0);
 154   for (int i = 0; i < kNumColumns - 1; i++)
 155     column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 156                           0.1f, GridLayout::USE_PREF, 0, 0);
 157   column_set->AddPaddingColumn(0, 8);
 158
 159   h_align_cb_ = AddCombobox(layout, "H-Align", kHorizontalAligments,
 160                             arraysize(kHorizontalAligments));
 161   eliding_cb_ = AddCombobox(layout, "Eliding", kElideBehaviors,
 162                             arraysize(kElideBehaviors));
 163   prefix_cb_ = AddCombobox(layout, "Prefix", kPrefixOptions,
 164                            arraysize(kPrefixOptions));
 165   text_cb_ = AddCombobox(layout, "Example Text", kTextExamples,
 166                          arraysize(kTextExamples));
 167
 168   layout->StartRow(0, 0);
 169   multiline_checkbox_ = AddCheckbox(layout, "Multiline");
 170   break_checkbox_ = AddCheckbox(layout, "Character Break");
 171   halo_checkbox_ = AddCheckbox(layout, "Halo");
 172   bold_checkbox_ = AddCheckbox(layout, "Bold");
 173   italic_checkbox_ = AddCheckbox(layout, "Italic");
 174   underline_checkbox_ = AddCheckbox(layout, "Underline");
 175
 176   layout->AddPaddingRow(0, 20);
 177   column_set = layout->AddColumnSet(1);
 178   column_set->AddPaddingColumn(0, 16);
 179   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 180                         1, GridLayout::USE_PREF, 0, 0);
 181   column_set->AddPaddingColumn(0, 16);
 182   layout->StartRow(1, 1);
 183   layout->AddView(text_view_);
 184   layout->AddPaddingRow(0, 8);
 185 }
 186
 187 void TextExample::ButtonPressed(Button* button, const ui::Event& event) {
 188   int flags = text_view_->flags();
 189   int style = text_view_->GetStyle();
 190   SetFlagFromCheckbox(multiline_checkbox_, &flags, gfx::Canvas::MULTI_LINE);
 191   SetFlagFromCheckbox(break_checkbox_, &flags, gfx::Canvas::CHARACTER_BREAK);
 192   SetFlagFromCheckbox(bold_checkbox_, &style, gfx::Font::BOLD);
 193   SetFlagFromCheckbox(italic_checkbox_, &style, gfx::Font::ITALIC);
 194   SetFlagFromCheckbox(underline_checkbox_, &style, gfx::Font::UNDERLINE);
 195   text_view_->set_halo(halo_checkbox_->checked());
 196   text_view_->set_flags(flags);
 197   text_view_->SetStyle(style);
 198   text_view_->SchedulePaint();
 199 }
 200
 201 void TextExample::OnPerformAction(Combobox* combobox) {
 202   int flags = text_view_->flags();
 203   if (combobox == h_align_cb_) {
 204     flags &= ~(gfx::Canvas::TEXT_ALIGN_LEFT |
 205                gfx::Canvas::TEXT_ALIGN_CENTER |
 206                gfx::Canvas::TEXT_ALIGN_RIGHT);
 207     switch (combobox->selected_index()) {
 208       case 0:
 209         break;
 210       case 1:
 211         flags |= gfx::Canvas::TEXT_ALIGN_LEFT;
 212         break;
 213       case 2:
 214         flags |= gfx::Canvas::TEXT_ALIGN_CENTER;
 215         break;
 216       case 3:
 217         flags |= gfx::Canvas::TEXT_ALIGN_RIGHT;
 218         break;
 219     }
 220   } else if (combobox == text_cb_) {
 221     switch (combobox->selected_index()) {
 222       case 0:
 223         text_view_->set_text(base::ASCIIToUTF16(kShortText));
 224         break;
 225       case 1:
 226         text_view_->set_text(base::ASCIIToUTF16(kLongText));
 227         break;
 228       case 2:
 229         text_view_->set_text(base::ASCIIToUTF16(kAmpersandText));
 230         break;
 231       case 3:
 232         text_view_->set_text(base::WideToUTF16(kRightToLeftText));
 233         break;
 234     }
 235   } else if (combobox == eliding_cb_) {
 236     switch (combobox->selected_index()) {
 237       case 0:
 238         text_view_->set_elide(gfx::ELIDE_TAIL);
 239         break;
 240       case 1:
 241         text_view_->set_elide(gfx::NO_ELIDE);
 242         break;
 243       case 2:
 244         text_view_->set_elide(gfx::FADE_TAIL);
 245         break;
 246     }
 247   } else if (combobox == prefix_cb_) {
 248     flags &= ~(gfx::Canvas::SHOW_PREFIX | gfx::Canvas::HIDE_PREFIX);
 249     switch (combobox->selected_index()) {
 250       case 0:
 251         break;
 252       case 1:
 253         flags |= gfx::Canvas::SHOW_PREFIX;
 254         break;
 255       case 2:
 256         flags |= gfx::Canvas::HIDE_PREFIX;
 257         break;
 258     }
 259   }
 260   text_view_->set_flags(flags);
 261   text_view_->SchedulePaint();
 262 }
 263
 264 }  // namespace examples
 265 }  // namespace views