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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 | |
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