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      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
    266