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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/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
    216