ui/views/examples/label_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/label_example.h"
   6
   7 #include "base/strings/utf_string_conversions.h"
   8 #include "ui/views/background.h"
   9 #include "ui/views/border.h"
  10 #include "ui/views/controls/button/checkbox.h"
  11 #include "ui/views/controls/combobox/combobox.h"
  12 #include "ui/views/controls/label.h"
  13 #include "ui/views/controls/textfield/textfield.h"
  14 #include "ui/views/examples/example_combobox_model.h"
  15 #include "ui/views/layout/box_layout.h"
  16 #include "ui/views/layout/grid_layout.h"
  17 #include "ui/views/view.h"
  18
  19 using base::ASCIIToUTF16;
  20 using base::WideToUTF16;
  21
  22 namespace views {
  23 namespace examples {
  24
  25 namespace {
  26
  27 const char* kElideBehaviors[] = { "No Elide", "Truncate", "Elide Head",
  28     "Elide Middle", "Elide Tail", "Elide Email", "Fade Tail" };
  29 const char* kAlignments[] = { "Left", "Center", "Right", "Head" };
  30
  31 // A Label with a clamped preferred width to demonstrate eliding or wrapping.
  32 class PreferredSizeLabel : public Label {
  33  public:
  34   PreferredSizeLabel() : Label() {
  35     SetBorder(Border::CreateSolidBorder(1, SK_ColorGRAY));
  36   }
  37   virtual ~PreferredSizeLabel() {}
  38
  39   // Label:
  40   virtual gfx::Size GetPreferredSize() const OVERRIDE {
  41     return gfx::Size(50, Label::GetPreferredSize().height());
  42   }
  43
  44  private:
  45   DISALLOW_COPY_AND_ASSIGN(PreferredSizeLabel);
  46 };
  47
  48 }  // namespace
  49
  50 LabelExample::LabelExample()
  51     : ExampleBase("Label"),
  52       textfield_(NULL),
  53       alignment_(NULL),
  54       elide_behavior_(NULL),
  55       multiline_(NULL),
  56       shadows_(NULL),
  57       custom_label_(NULL) {
  58 }
  59
  60 LabelExample::~LabelExample() {
  61   // Remove the views first as some reference combobox models.
  62   container()->RemoveAllChildViews(true);
  63 }
  64
  65 void LabelExample::CreateExampleView(View* container) {
  66   // A very simple label example, followed by additional helpful examples.
  67   container->SetLayoutManager(new BoxLayout(BoxLayout::kVertical, 0, 0, 10));
  68   Label* label = new Label(ASCIIToUTF16("Hello world!"));
  69   container->AddChildView(label);
  70
  71   const wchar_t hello_world_hebrew[] =
  72       L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd!";
  73   label = new Label(WideToUTF16(hello_world_hebrew));
  74   label->SetHorizontalAlignment(gfx::ALIGN_RIGHT);
  75   container->AddChildView(label);
  76
  77   label = new Label(WideToUTF16(L"A UTF16 surrogate pair: \x5d0\x5b0"));
  78   label->SetHorizontalAlignment(gfx::ALIGN_RIGHT);
  79   container->AddChildView(label);
  80
  81   label = new Label(ASCIIToUTF16("A left-aligned blue label."));
  82   label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
  83   label->SetEnabledColor(SK_ColorBLUE);
  84   container->AddChildView(label);
  85
  86   label = new Label(WideToUTF16(L"Password!"));
  87   label->SetObscured(true);
  88   container->AddChildView(label);
  89
  90   label = new Label(ASCIIToUTF16("A Courier-18 label with shadows."));
  91   label->SetFontList(gfx::FontList("Courier, 18px"));
  92   gfx::ShadowValues shadows(1, gfx::ShadowValue(gfx::Point(), 1, SK_ColorRED));
  93   gfx::ShadowValue shadow(gfx::Point(2, 2), 0, SK_ColorGRAY);
  94   shadows.push_back(shadow);
  95   label->SetShadows(shadows);
  96   container->AddChildView(label);
  97
  98   label = new PreferredSizeLabel();
  99   label->SetText(ASCIIToUTF16("A long label will elide toward its logical end "
 100       "if the text's width exceeds the label's available width."));
 101   container->AddChildView(label);
 102
 103   label = new PreferredSizeLabel();
 104   label->SetText(ASCIIToUTF16("A multi-line label will wrap onto subsequent "
 105     "lines if the text's width exceeds the label's available width, which is "
 106     "helpful for extemely long text used to demonstrate line wrapping."));
 107   label->SetMultiLine(true);
 108   container->AddChildView(label);
 109
 110   AddCustomLabel(container);
 111 }
 112
 113 void LabelExample::ButtonPressed(Button* button, const ui::Event& event) {
 114   if (button == multiline_) {
 115     custom_label_->SetMultiLine(multiline_->checked());
 116   } else if (button == shadows_) {
 117     gfx::ShadowValues shadows;
 118     if (shadows_->checked()) {
 119       shadows.push_back(gfx::ShadowValue(gfx::Point(), 1, SK_ColorRED));
 120       shadows.push_back(gfx::ShadowValue(gfx::Point(2, 2), 0, SK_ColorGRAY));
 121     }
 122     custom_label_->SetShadows(shadows);
 123   }
 124   custom_label_->parent()->parent()->Layout();
 125   custom_label_->SchedulePaint();
 126 }
 127
 128 void LabelExample::OnPerformAction(Combobox* combobox) {
 129   if (combobox == alignment_) {
 130     custom_label_->SetHorizontalAlignment(
 131         static_cast<gfx::HorizontalAlignment>(combobox->selected_index()));
 132   } else if (combobox == elide_behavior_) {
 133     custom_label_->SetElideBehavior(
 134         static_cast<gfx::ElideBehavior>(combobox->selected_index()));
 135   }
 136 }
 137
 138 void LabelExample::ContentsChanged(Textfield* sender,
 139                                    const base::string16& new_contents) {
 140   custom_label_->SetText(new_contents);
 141   custom_label_->parent()->parent()->Layout();
 142 }
 143
 144 void LabelExample::AddCustomLabel(View* container) {
 145   View* control_container = new View();
 146   control_container->SetBorder(Border::CreateSolidBorder(2, SK_ColorGRAY));
 147   control_container->set_background(
 148       Background::CreateSolidBackground(SK_ColorLTGRAY));
 149   GridLayout* layout = GridLayout::CreatePanel(control_container);
 150   control_container->SetLayoutManager(layout);
 151
 152   ColumnSet* column_set = layout->AddColumnSet(0);
 153   column_set->AddColumn(GridLayout::LEADING, GridLayout::FILL,
 154                         0.0f, GridLayout::USE_PREF, 0, 0);
 155   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 156                         1.0f, GridLayout::USE_PREF, 0, 0);
 157
 158   layout->StartRow(0, 0);
 159   layout->AddView(new Label(ASCIIToUTF16("Content: ")));
 160   textfield_ = new Textfield();
 161   textfield_->SetText(ASCIIToUTF16("Use the provided controls to configure the "
 162       "content and presentation of this custom label."));
 163   textfield_->SetSelectionRange(gfx::Range());
 164   textfield_->set_controller(this);
 165   layout->AddView(textfield_);
 166
 167   alignment_ = AddCombobox(layout, "Alignment: ", kAlignments,
 168                            arraysize(kAlignments));
 169   elide_behavior_ = AddCombobox(layout, "Elide Behavior: ", kElideBehaviors,
 170                                 arraysize(kElideBehaviors));
 171
 172   column_set = layout->AddColumnSet(1);
 173   column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING,
 174                         0, GridLayout::USE_PREF, 0, 0);
 175   column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING,
 176                         0, GridLayout::USE_PREF, 0, 0);
 177   layout->StartRow(0, 1);
 178   multiline_ = new Checkbox(base::ASCIIToUTF16("Multiline"));
 179   multiline_->set_listener(this);
 180   layout->AddView(multiline_);
 181   shadows_ = new Checkbox(base::ASCIIToUTF16("Shadows"));
 182   shadows_->set_listener(this);
 183   layout->AddView(shadows_);
 184   layout->AddPaddingRow(0, 8);
 185
 186   column_set = layout->AddColumnSet(2);
 187   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 188                         1, GridLayout::USE_PREF, 0, 0);
 189   layout->StartRow(0, 2);
 190   custom_label_ = new PreferredSizeLabel();
 191   custom_label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 192   custom_label_->SetElideBehavior(gfx::NO_ELIDE);
 193   custom_label_->SetText(textfield_->text());
 194   layout->AddView(custom_label_);
 195
 196   container->AddChildView(control_container);
 197 }
 198
 199 Combobox* LabelExample::AddCombobox(GridLayout* layout,
 200                                     const char* name,
 201                                     const char** strings,
 202                                     int count) {
 203   layout->StartRow(0, 0);
 204   layout->AddView(new Label(base::ASCIIToUTF16(name)));
 205   ExampleComboboxModel* model = new ExampleComboboxModel(strings, count);
 206   example_combobox_models_.push_back(model);
 207   Combobox* combobox = new Combobox(model);
 208   combobox->SetSelectedIndex(0);
 209   combobox->set_listener(this);
 210   layout->AddView(combobox);
 211   return combobox;
 212 }
 213
 214 }  // namespace examples
 215 }  // namespace views