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   label = new Label(ASCIIToUTF16("Label with thick border"));
 113   label->SetBorder(Border::CreateSolidBorder(20, SK_ColorRED));
 114   container->AddChildView(label);
 115
 116   AddCustomLabel(container);
 117 }
 118
 119 void LabelExample::ButtonPressed(Button* button, const ui::Event& event) {
 120   if (button == multiline_) {
 121     custom_label_->SetMultiLine(multiline_->checked());
 122   } else if (button == shadows_) {
 123     gfx::ShadowValues shadows;
 124     if (shadows_->checked()) {
 125       shadows.push_back(gfx::ShadowValue(gfx::Vector2d(), 1, SK_ColorRED));
 126       shadows.push_back(gfx::ShadowValue(gfx::Vector2d(2, 2), 0, SK_ColorGRAY));
 127     }
 128     custom_label_->SetShadows(shadows);
 129   }
 130   custom_label_->parent()->parent()->Layout();
 131   custom_label_->SchedulePaint();
 132 }
 133
 134 void LabelExample::OnPerformAction(Combobox* combobox) {
 135   if (combobox == alignment_) {
 136     custom_label_->SetHorizontalAlignment(
 137         static_cast<gfx::HorizontalAlignment>(combobox->selected_index()));
 138   } else if (combobox == elide_behavior_) {
 139     custom_label_->SetElideBehavior(
 140         static_cast<gfx::ElideBehavior>(combobox->selected_index()));
 141   }
 142 }
 143
 144 void LabelExample::ContentsChanged(Textfield* sender,
 145                                    const base::string16& new_contents) {
 146   custom_label_->SetText(new_contents);
 147   custom_label_->parent()->parent()->Layout();
 148 }
 149
 150 void LabelExample::AddCustomLabel(View* container) {
 151   View* control_container = new View();
 152   control_container->SetBorder(Border::CreateSolidBorder(2, SK_ColorGRAY));
 153   control_container->set_background(
 154       Background::CreateSolidBackground(SK_ColorLTGRAY));
 155   GridLayout* layout = GridLayout::CreatePanel(control_container);
 156   control_container->SetLayoutManager(layout);
 157
 158   ColumnSet* column_set = layout->AddColumnSet(0);
 159   column_set->AddColumn(GridLayout::LEADING, GridLayout::FILL,
 160                         0.0f, GridLayout::USE_PREF, 0, 0);
 161   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 162                         1.0f, GridLayout::USE_PREF, 0, 0);
 163
 164   layout->StartRow(0, 0);
 165   layout->AddView(new Label(ASCIIToUTF16("Content: ")));
 166   textfield_ = new Textfield();
 167   textfield_->SetText(ASCIIToUTF16("Use the provided controls to configure the "
 168       "content and presentation of this custom label."));
 169   textfield_->SetSelectionRange(gfx::Range());
 170   textfield_->set_controller(this);
 171   layout->AddView(textfield_);
 172
 173   alignment_ = AddCombobox(layout, "Alignment: ", kAlignments,
 174                            arraysize(kAlignments));
 175   elide_behavior_ = AddCombobox(layout, "Elide Behavior: ", kElideBehaviors,
 176                                 arraysize(kElideBehaviors));
 177
 178   column_set = layout->AddColumnSet(1);
 179   column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING,
 180                         0, GridLayout::USE_PREF, 0, 0);
 181   column_set->AddColumn(GridLayout::LEADING, GridLayout::LEADING,
 182                         0, GridLayout::USE_PREF, 0, 0);
 183   layout->StartRow(0, 1);
 184   multiline_ = new Checkbox(base::ASCIIToUTF16("Multiline"));
 185   multiline_->set_listener(this);
 186   layout->AddView(multiline_);
 187   shadows_ = new Checkbox(base::ASCIIToUTF16("Shadows"));
 188   shadows_->set_listener(this);
 189   layout->AddView(shadows_);
 190   layout->AddPaddingRow(0, 8);
 191
 192   column_set = layout->AddColumnSet(2);
 193   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL,
 194                         1, GridLayout::USE_PREF, 0, 0);
 195   layout->StartRow(0, 2);
 196   custom_label_ = new PreferredSizeLabel();
 197   custom_label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 198   custom_label_->SetElideBehavior(gfx::NO_ELIDE);
 199   custom_label_->SetText(textfield_->text());
 200   layout->AddView(custom_label_);
 201
 202   container->AddChildView(control_container);
 203 }
 204
 205 Combobox* LabelExample::AddCombobox(GridLayout* layout,
 206                                     const char* name,
 207                                     const char** strings,
 208                                     int count) {
 209   layout->StartRow(0, 0);
 210   layout->AddView(new Label(base::ASCIIToUTF16(name)));
 211   ExampleComboboxModel* model = new ExampleComboboxModel(strings, count);
 212   example_combobox_models_.push_back(model);
 213   Combobox* combobox = new Combobox(model);
 214   combobox->SetSelectedIndex(0);
 215   combobox->set_listener(this);
 216   layout->AddView(combobox);
 217   return combobox;
 218 }
 219
 220 }  // namespace examples
 221 }  // namespace views