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/gfx/geometry/vector2d.h"
   9 #include "ui/views/background.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/controls/textfield/textfield.h"
  15 #include "ui/views/examples/example_combobox_model.h"
  16 #include "ui/views/layout/box_layout.h"
  17 #include "ui/views/layout/grid_layout.h"
  18 #include "ui/views/view.h"
  19
  20 using base::ASCIIToUTF16;
  21 using base::WideToUTF16;
  22
  23 namespace views {
  24 namespace examples {
  25
  26 namespace {
  27
  28 const char* kElideBehaviors[] = { "No Elide", "Truncate", "Elide Head",
  29     "Elide Middle", "Elide Tail", "Elide Email", "Fade Tail" };
  30 const char* kAlignments[] = { "Left", "Center", "Right", "Head" };
  31
  32 // A Label with a clamped preferred width to demonstrate eliding or wrapping.
  33 class PreferredSizeLabel : public Label {
  34  public:
  35   PreferredSizeLabel() : Label() {
  36     SetBorder(Border::CreateSolidBorder(1, SK_ColorGRAY));
  37   }
  38   ~PreferredSizeLabel() override {}
  39
  40   // Label:
  41   gfx::Size GetPreferredSize() const override {
  42     return gfx::Size(50, Label::GetPreferredSize().height());
  43   }
  44
  45  private:
  46   DISALLOW_COPY_AND_ASSIGN(PreferredSizeLabel);
  47 };
  48
  49 }  // namespace
  50
  51 LabelExample::LabelExample()
  52     : ExampleBase("Label"),
  53       textfield_(NULL),
  54       alignment_(NULL),
  55       elide_behavior_(NULL),
  56       multiline_(NULL),
  57       shadows_(NULL),
  58       custom_label_(NULL) {
  59 }
  60
  61 LabelExample::~LabelExample() {
  62   // Remove the views first as some reference combobox models.
  63   container()->RemoveAllChildViews(true);
  64 }
  65
  66 void LabelExample::CreateExampleView(View* container) {
  67   // A very simple label example, followed by additional helpful examples.
  68   container->SetLayoutManager(new BoxLayout(BoxLayout::kVertical, 0, 0, 10));
  69   Label* label = new Label(ASCIIToUTF16("Hello world!"));
  70   container->AddChildView(label);
  71
  72   const wchar_t hello_world_hebrew[] =
  73       L"\x5e9\x5dc\x5d5\x5dd \x5d4\x5e2\x5d5\x5dc\x5dd!";
  74   label = new Label(WideToUTF16(hello_world_hebrew));
  75   label->SetHorizontalAlignment(gfx::ALIGN_RIGHT);
  76   container->AddChildView(label);
  77
  78   label = new Label(WideToUTF16(L"A UTF16 surrogate pair: \x5d0\x5b0"));
  79   label->SetHorizontalAlignment(gfx::ALIGN_RIGHT);
  80   container->AddChildView(label);
  81
  82   label = new Label(ASCIIToUTF16("A left-aligned blue label."));
  83   label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
  84   label->SetEnabledColor(SK_ColorBLUE);
  85   container->AddChildView(label);
  86
  87   label = new Label(WideToUTF16(L"Password!"));
  88   label->SetObscured(true);
  89   container->AddChildView(label);
  90
  91   label = new Label(ASCIIToUTF16("A Courier-18 label with shadows."));
  92   label->SetFontList(gfx::FontList("Courier, 18px"));
  93   gfx::ShadowValues shadows(1,
  94                             gfx::ShadowValue(gfx::Vector2d(), 1, SK_ColorRED));
  95   gfx::ShadowValue shadow(gfx::Vector2d(2, 2), 0, SK_ColorGRAY);
  96   shadows.push_back(shadow);
  97   label->SetShadows(shadows);
  98   container->AddChildView(label);
  99
 100   label = new PreferredSizeLabel();
 101   label->SetText(ASCIIToUTF16("A long label will elide toward its logical end "
 102       "if the text's width exceeds the label's available width."));
 103   container->AddChildView(label);
 104
 105   label = new PreferredSizeLabel();
 106   label->SetText(ASCIIToUTF16("A multi-line label will wrap onto subsequent "
 107     "lines if the text's width exceeds the label's available width, which is "
 108     "helpful for extemely long text used to demonstrate line wrapping."));
 109   label->SetMultiLine(true);
 110   container->AddChildView(label);
 111
 112   AddCustomLabel(container);
 113 }
 114
 115 void LabelExample::ButtonPressed(Button* button, const ui::Event& event) {
 116   if (button == multiline_) {
 117     custom_label_->SetMultiLine(multiline_->checked());
 118   } else if (button == shadows_) {
 119     gfx::ShadowValues shadows;
 120     if (shadows_->checked()) {
 121       shadows.push_back(gfx::ShadowValue(gfx::Vector2d(), 1, SK_ColorRED));
 122       shadows.push_back(gfx::ShadowValue(gfx::Vector2d(2, 2), 0, SK_ColorGRAY));
 123     }
 124     custom_label_->SetShadows(shadows);
 125   }
 126   custom_label_->parent()->parent()->Layout();
 127   custom_label_->SchedulePaint();
 128 }
 129
 130 void LabelExample::OnPerformAction(Combobox* combobox) {
 131   if (combobox == alignment_) {
 132     custom_label_->SetHorizontalAlignment(
 133         static_cast<gfx::HorizontalAlignment>(combobox->selected_index()));
 134   } else if (combobox == elide_behavior_) {
 135     custom_label_->SetElideBehavior(
 136         static_cast<gfx::ElideBehavior>(combobox->selected_index()));
 137   }
 138 }
 139
 140 void LabelExample::ContentsChanged(Textfield* sender,
 141                                    const base::string16& new_contents) {
 142   custom_label_->SetText(new_contents);
 143   custom_label_->parent()->parent()->Layout();
 144 }
 145
 146 void LabelExample::AddCustomLabel(View* container) {
 147   View* control_container = new View();
 148   control_container->SetBorder(Border::CreateSolidBorder(2, SK_ColorGRAY));
 149   control_container->set_background(
 150       Background::CreateSolidBackground(SK_ColorLTGRAY));
 151   GridLayout* layout = GridLayout::CreatePanel(control_container);
 152   control_container->SetLayoutManager(layout);
 153
 154   ColumnSet* column_set = layout->AddColumnSet(0);
 155   column_set->AddColumn(GridLayout::LEADING, GridLayout::FILL,
 156                         0.0f, GridLayout::USE_PREF, 0, 0);
 157   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 158                         1.0f, GridLayout::USE_PREF, 0, 0);
 159
 160   layout->StartRow(0, 0);
 161   layout->AddView(new Label(ASCIIToUTF16("Content: ")));
 162   textfield_ = new Textfield();
 163   textfield_->SetText(ASCIIToUTF16("Use the provided controls to configure the "
 164       "content and presentation of this custom label."));
 165   textfield_->SetSelectionRange(gfx::Range());
 166   textfield_->set_controller(this);
 167   layout->AddView(textfield_);
 168
 169   alignment_ = AddCombobox(layout, "Alignment: ", kAlignments,
 170                            arraysize(kAlignments));
 171   elide_behavior_ = AddCombobox(layout, "Elide Behavior: ", kElideBehaviors,
 172                                 arraysize(kElideBehaviors));
 173
 174   column_set = layout->AddColumnSet(1);
 175   column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING,
 176                         0, GridLayout::USE_PREF, 0, 0);
 177   column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING,
 178                         0, GridLayout::USE_PREF, 0, 0);
 179   layout->StartRow(0, 1);
 180   multiline_ = new Checkbox(base::ASCIIToUTF16("Multiline"));
 181   multiline_->set_listener(this);
 182   layout->AddView(multiline_);
 183   shadows_ = new Checkbox(base::ASCIIToUTF16("Shadows"));
 184   shadows_->set_listener(this);
 185   layout->AddView(shadows_);
 186   layout->AddPaddingRow(0, 8);
 187
 188   column_set = layout->AddColumnSet(2);
 189   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 190                         1, GridLayout::USE_PREF, 0, 0);
 191   layout->StartRow(0, 2);
 192   custom_label_ = new PreferredSizeLabel();
 193   custom_label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 194   custom_label_->SetElideBehavior(gfx::NO_ELIDE);
 195   custom_label_->SetText(textfield_->text());
 196   layout->AddView(custom_label_);
 197
 198   container->AddChildView(control_container);
 199 }
 200
 201 Combobox* LabelExample::AddCombobox(GridLayout* layout,
 202                                     const char* name,
 203                                     const char** strings,
 204                                     int count) {
 205   layout->StartRow(0, 0);
 206   layout->AddView(new Label(base::ASCIIToUTF16(name)));
 207   ExampleComboboxModel* model = new ExampleComboboxModel(strings, count);
 208   example_combobox_models_.push_back(model);
 209   Combobox* combobox = new Combobox(model);
 210   combobox->SetSelectedIndex(0);
 211   combobox->set_listener(this);
 212   layout->AddView(combobox);
 213   return combobox;
 214 }
 215
 216 }  // namespace examples
 217 }  // namespace views