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/base/resource/resource_bundle.h"
   9 #include "ui/gfx/canvas.h"
  10 #include "ui/gfx/font_list.h"
  11 #include "ui/views/border.h"
  12 #include "ui/views/controls/button/checkbox.h"
  13 #include "ui/views/controls/combobox/combobox.h"
  14 #include "ui/views/controls/label.h"
  15 #include "ui/views/examples/example_combobox_model.h"
  16 #include "ui/views/layout/grid_layout.h"
  17 #include "ui/views/view.h"
  18
  19 using base::ASCIIToUTF16;
  20
  21 namespace views {
  22 namespace examples {
  23
  24 namespace {
  25
  26 // Number of columns in the view layout.
  27 const int kNumColumns = 10;
  28
  29 const char kShortText[] = "Batman";
  30 const char kMediumText[] = "The quick brown fox jumps over the lazy dog.";
  31 const char kLongText[] =
  32     "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod "
  33     "tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim "
  34     "veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea "
  35     "commodo consequat. Duis aute irure dolor in reprehenderit in voluptate "
  36     "velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint "
  37     "occaecat cupidatat non proident, sunt in culpa qui officia deserunt "
  38     "mollit anim id est laborum.";
  39 const char kAmpersandText[] =
  40     "The quick && &brown fo&x jumps over the lazy dog.";
  41 const char kNewlineText[] =
  42     "The quick \nbrown fox jumps\n\n over the lazy dog.";
  43
  44 const char* kTextExamples[] = {
  45     "Short",
  46     "Medium",
  47     "Long",
  48     "Ampersands",
  49     "Newlines",
  50 };
  51
  52 const char* kElidingBehaviors[] = {
  53     "Ellipsis",
  54     "None",
  55     "Fade Tail",
  56     "Fade Head",
  57 };
  58
  59 const char* kPrefixOptions[] = {
  60     "Default",
  61     "Show",
  62     "Hide",
  63 };
  64
  65 const char* kHorizontalAligments[] = {
  66     "Default",
  67     "Left",
  68     "Center",
  69     "Right",
  70 };
  71
  72 // Toggles bit |flag| on |flags| based on state of |checkbox|.
  73 void SetFlagFromCheckbox(Checkbox* checkbox, int* flags, int flag) {
  74   if (checkbox->checked())
  75     *flags |= flag;
  76   else
  77     *flags &= ~flag;
  78 }
  79
  80 }  // namespace
  81
  82 // TextExample's content view, which is responsible for drawing a string with
  83 // the specified style.
  84 class TextExample::TextExampleView : public View {
  85  public:
  86   TextExampleView()
  87     : text_(ASCIIToUTF16(kShortText)),
  88       text_flags_(0),
  89       halo_(false),
  90       fade_(false),
  91       fade_mode_(gfx::Canvas::TruncateFadeTail) {
  92   }
  93
  94   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
  95     View::OnPaint(canvas);
  96     const gfx::Rect bounds = GetContentsBounds();
  97
  98     if (fade_) {
  99       canvas->DrawFadeTruncatingStringRect(text_, fade_mode_, font_list_,
 100                                            SK_ColorDKGRAY, bounds);
 101     } else if (halo_) {
 102       canvas->DrawStringRectWithHalo(text_, font_list_, SK_ColorDKGRAY,
 103                                      SK_ColorWHITE, bounds, text_flags_);
 104     } else {
 105       canvas->DrawStringRectWithFlags(text_, font_list_, SK_ColorDKGRAY, bounds,
 106                                       text_flags_);
 107     }
 108   }
 109
 110   int text_flags() const { return text_flags_; }
 111   void set_text_flags(int text_flags) { text_flags_ = text_flags; }
 112
 113   const base::string16& text() const { return text_; }
 114   void set_text(const base::string16& text) { text_ = text; }
 115
 116   bool halo() const { return halo_; }
 117   void set_halo(bool halo) { halo_ = halo; }
 118
 119   bool fade() const { return fade_; }
 120   void set_fade(bool fade) { fade_ = fade; }
 121
 122   gfx::Canvas::TruncateFadeMode fade_mode() const { return fade_mode_; }
 123   void set_fade_mode(gfx::Canvas::TruncateFadeMode mode) { fade_mode_ = mode; }
 124
 125   int GetFontStyle() const {
 126     return font_list_.GetFontStyle();
 127   }
 128   void SetFontStyle(int style) {
 129     font_list_ = font_list_.DeriveWithStyle(style);
 130   }
 131
 132  private:
 133   // The font used for drawing the text.
 134   gfx::FontList font_list_;
 135
 136   // The text to draw.
 137   base::string16 text_;
 138
 139   // Text flags for passing to |DrawStringRect()|.
 140   int text_flags_;
 141
 142   // If |true|, specifies to call |DrawStringWithHalo()| instead of
 143   // |DrawStringRect()|.
 144   bool halo_;
 145
 146   // If |true|, specifies to call |DrawFadeTruncatingString()| instead of
 147   // |DrawStringRect()|.
 148   bool fade_;
 149
 150   // If |fade_| is |true|, fade mode parameter to |DrawFadeTruncatingString()|.
 151   gfx::Canvas::TruncateFadeMode fade_mode_;
 152
 153   DISALLOW_COPY_AND_ASSIGN(TextExampleView);
 154 };
 155
 156 TextExample::TextExample() : ExampleBase("Text Styles") {
 157 }
 158
 159 TextExample::~TextExample() {
 160   // Remove all the views first as some reference models in
 161   // |example_combobox_model_|.
 162   container()->RemoveAllChildViews(true);
 163 }
 164
 165 Checkbox* TextExample::AddCheckbox(GridLayout* layout, const char* name) {
 166   Checkbox* checkbox = new Checkbox(ASCIIToUTF16(name));
 167   checkbox->set_listener(this);
 168   layout->AddView(checkbox);
 169   return checkbox;
 170 }
 171
 172 Combobox* TextExample::AddCombobox(GridLayout* layout,
 173                                    const char* name,
 174                                    const char** strings,
 175                                    int count) {
 176   layout->StartRow(0, 0);
 177   layout->AddView(new Label(ASCIIToUTF16(name)));
 178   ExampleComboboxModel* combobox_model = new ExampleComboboxModel(strings,
 179                                                                   count);
 180   example_combobox_model_.push_back(combobox_model);
 181   Combobox* combobox = new Combobox(combobox_model);
 182   combobox->SetSelectedIndex(0);
 183   combobox->set_listener(this);
 184   layout->AddView(combobox, kNumColumns - 1, 1);
 185   return combobox;
 186 }
 187
 188 void TextExample::CreateExampleView(View* container) {
 189   text_view_ = new TextExampleView;
 190   text_view_->SetBorder(Border::CreateSolidBorder(1, SK_ColorGRAY));
 191
 192   GridLayout* layout = new GridLayout(container);
 193   container->SetLayoutManager(layout);
 194
 195   layout->AddPaddingRow(0, 8);
 196
 197   ColumnSet* column_set = layout->AddColumnSet(0);
 198   column_set->AddPaddingColumn(0, 8);
 199   column_set->AddColumn(GridLayout::LEADING, GridLayout::FILL,
 200                         0.1f, GridLayout::USE_PREF, 0, 0);
 201   for (int i = 0; i < kNumColumns - 1; i++)
 202     column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 203                           0.1f, GridLayout::USE_PREF, 0, 0);
 204   column_set->AddPaddingColumn(0, 8);
 205
 206   h_align_cb_ = AddCombobox(layout,
 207                             "H-Align",
 208                             kHorizontalAligments,
 209                             arraysize(kHorizontalAligments));
 210   eliding_cb_ = AddCombobox(layout,
 211                             "Eliding",
 212                             kElidingBehaviors,
 213                             arraysize(kElidingBehaviors));
 214   prefix_cb_ = AddCombobox(layout,
 215                            "Prefix",
 216                            kPrefixOptions,
 217                            arraysize(kPrefixOptions));
 218   text_cb_ = AddCombobox(layout,
 219                          "Example Text",
 220                          kTextExamples,
 221                          arraysize(kTextExamples));
 222
 223   layout->StartRow(0, 0);
 224   multiline_checkbox_ = AddCheckbox(layout, "Multiline");
 225   break_checkbox_ = AddCheckbox(layout, "Character Break");
 226   halo_checkbox_ = AddCheckbox(layout, "Text Halo");
 227   bold_checkbox_ = AddCheckbox(layout, "Bold");
 228   italic_checkbox_ = AddCheckbox(layout, "Italic");
 229   underline_checkbox_ = AddCheckbox(layout, "Underline");
 230
 231   layout->AddPaddingRow(0, 32);
 232
 233   column_set = layout->AddColumnSet(1);
 234   column_set->AddPaddingColumn(0, 16);
 235   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 236                         1, GridLayout::USE_PREF, 0, 0);
 237   column_set->AddPaddingColumn(0, 16);
 238   layout->StartRow(1, 1);
 239   layout->AddView(text_view_);
 240
 241   layout->AddPaddingRow(0, 8);
 242 }
 243
 244 void TextExample::ButtonPressed(Button* button, const ui::Event& event) {
 245   int flags = text_view_->text_flags();
 246   int style = text_view_->GetFontStyle();
 247   SetFlagFromCheckbox(multiline_checkbox_, &flags, gfx::Canvas::MULTI_LINE);
 248   SetFlagFromCheckbox(break_checkbox_, &flags, gfx::Canvas::CHARACTER_BREAK);
 249   SetFlagFromCheckbox(bold_checkbox_, &style, gfx::Font::BOLD);
 250   SetFlagFromCheckbox(italic_checkbox_, &style, gfx::Font::ITALIC);
 251   SetFlagFromCheckbox(underline_checkbox_, &style, gfx::Font::UNDERLINE);
 252   text_view_->set_halo(halo_checkbox_->checked());
 253   text_view_->set_text_flags(flags);
 254   text_view_->SetFontStyle(style);
 255   text_view_->SchedulePaint();
 256 }
 257
 258 void TextExample::OnPerformAction(Combobox* combobox) {
 259   int text_flags = text_view_->text_flags();
 260   if (combobox == h_align_cb_) {
 261     text_flags &= ~(gfx::Canvas::TEXT_ALIGN_LEFT |
 262                     gfx::Canvas::TEXT_ALIGN_CENTER |
 263                     gfx::Canvas::TEXT_ALIGN_RIGHT);
 264     switch (combobox->selected_index()) {
 265       case 0:
 266         break;
 267       case 1:
 268         text_flags |= gfx::Canvas::TEXT_ALIGN_LEFT;
 269         break;
 270       case 2:
 271         text_flags |= gfx::Canvas::TEXT_ALIGN_CENTER;
 272         break;
 273       case 3:
 274         text_flags |= gfx::Canvas::TEXT_ALIGN_RIGHT;
 275         break;
 276     }
 277   } else if (combobox == text_cb_) {
 278     switch (combobox->selected_index()) {
 279       case 0:
 280         text_view_->set_text(ASCIIToUTF16(kShortText));
 281         break;
 282       case 1:
 283         text_view_->set_text(ASCIIToUTF16(kMediumText));
 284         break;
 285       case 2:
 286         text_view_->set_text(ASCIIToUTF16(kLongText));
 287         break;
 288       case 3:
 289         text_view_->set_text(ASCIIToUTF16(kAmpersandText));
 290         break;
 291       case 4:
 292         text_view_->set_text(ASCIIToUTF16(kNewlineText));
 293         break;
 294     }
 295   } else if (combobox == eliding_cb_) {
 296     switch (combobox->selected_index()) {
 297       case 0:
 298         text_flags &= ~gfx::Canvas::NO_ELLIPSIS;
 299         text_view_->set_fade(false);
 300         break;
 301       case 1:
 302         text_flags |= gfx::Canvas::NO_ELLIPSIS;
 303         text_view_->set_fade(false);
 304         break;
 305       case 2:
 306         text_view_->set_fade_mode(gfx::Canvas::TruncateFadeTail);
 307         text_view_->set_fade(true);
 308         break;
 309       case 3:
 310         text_view_->set_fade_mode(gfx::Canvas::TruncateFadeHead);
 311         text_view_->set_fade(true);
 312         break;
 313     }
 314   } else if (combobox == prefix_cb_) {
 315     text_flags &= ~(gfx::Canvas::SHOW_PREFIX | gfx::Canvas::HIDE_PREFIX);
 316     switch (combobox->selected_index()) {
 317       case 0:
 318         break;
 319       case 1:
 320         text_flags |= gfx::Canvas::SHOW_PREFIX;
 321         break;
 322       case 2:
 323         text_flags |= gfx::Canvas::HIDE_PREFIX;
 324         break;
 325     }
 326   }
 327   text_view_->set_text_flags(text_flags);
 328   text_view_->SchedulePaint();
 329 }
 330
 331 }  // namespace examples
 332 }  // namespace views