1 // Copyright 2013 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/multiline_example.h" 6 7 #include "base/strings/utf_string_conversions.h" 8 #include "ui/events/event.h" 9 #include "ui/gfx/render_text.h" 10 #include "ui/views/background.h" 11 #include "ui/views/border.h" 12 #include "ui/views/controls/button/checkbox.h" 13 #include "ui/views/controls/label.h" 14 #include "ui/views/controls/textfield/textfield.h" 15 #include "ui/views/layout/grid_layout.h" 16 #include "ui/views/view.h" 17 18 using base::ASCIIToUTF16; 19 20 namespace views { 21 namespace examples { 22 23 namespace { 24 25 gfx::Range ClampRange(gfx::Range range, size_t max) { 26 range.set_start(std::min(range.start(), max)); 27 range.set_end(std::min(range.end(), max)); 28 return range; 29 } 30 31 } // namespace 32 33 // A simple View that hosts a RenderText object. 34 class MultilineExample::RenderTextView : public View { 35 public: 36 RenderTextView() : render_text_(gfx::RenderText::CreateInstance()) { 37 render_text_->SetHorizontalAlignment(gfx::ALIGN_CENTER); 38 render_text_->SetColor(SK_ColorBLACK); 39 render_text_->SetMultiline(true); 40 SetBorder(Border::CreateSolidBorder(2, SK_ColorGRAY)); 41 } 42 43 virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE { 44 View::OnPaint(canvas); 45 render_text_->Draw(canvas); 46 } 47 48 virtual gfx::Size GetPreferredSize() const OVERRIDE { 49 // Turn off multiline mode to get the single-line text size, which is the 50 // preferred size for this view. 51 render_text_->SetMultiline(false); 52 gfx::Size size(render_text_->GetContentWidth(), 53 render_text_->GetStringSize().height()); 54 size.Enlarge(GetInsets().width(), GetInsets().height()); 55 render_text_->SetMultiline(true); 56 return size; 57 } 58 59 virtual int GetHeightForWidth(int w) const OVERRIDE { 60 // TODO(ckocagil): Why does this happen? 61 if (w == 0) 62 return View::GetHeightForWidth(w); 63 const gfx::Rect old_rect = render_text_->display_rect(); 64 gfx::Rect rect = old_rect; 65 rect.set_width(w - GetInsets().width()); 66 render_text_->SetDisplayRect(rect); 67 int height = render_text_->GetStringSize().height() + GetInsets().height(); 68 render_text_->SetDisplayRect(old_rect); 69 return height; 70 } 71 72 void SetText(const base::string16& new_contents) { 73 // Color and style the text inside |test_range| to test colors and styles. 74 const size_t range_max = new_contents.length(); 75 gfx::Range color_range = ClampRange(gfx::Range(1, 21), range_max); 76 gfx::Range bold_range = ClampRange(gfx::Range(4, 10), range_max); 77 gfx::Range italic_range = ClampRange(gfx::Range(7, 13), range_max); 78 79 render_text_->SetText(new_contents); 80 render_text_->SetColor(SK_ColorBLACK); 81 render_text_->ApplyColor(0xFFFF0000, color_range); 82 render_text_->SetStyle(gfx::DIAGONAL_STRIKE, false); 83 render_text_->ApplyStyle(gfx::DIAGONAL_STRIKE, true, color_range); 84 render_text_->SetStyle(gfx::UNDERLINE, false); 85 render_text_->ApplyStyle(gfx::UNDERLINE, true, color_range); 86 render_text_->ApplyStyle(gfx::BOLD, true, bold_range); 87 render_text_->ApplyStyle(gfx::ITALIC, true, italic_range); 88 InvalidateLayout(); 89 } 90 91 private: 92 virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE { 93 gfx::Rect bounds = GetLocalBounds(); 94 bounds.Inset(GetInsets()); 95 render_text_->SetDisplayRect(bounds); 96 } 97 98 scoped_ptr<gfx::RenderText> render_text_; 99 100 DISALLOW_COPY_AND_ASSIGN(RenderTextView); 101 }; 102 103 MultilineExample::MultilineExample() 104 : ExampleBase("Multiline RenderText"), 105 render_text_view_(NULL), 106 label_(NULL), 107 textfield_(NULL), 108 label_checkbox_(NULL) { 109 } 110 111 MultilineExample::~MultilineExample() { 112 } 113 114 void MultilineExample::CreateExampleView(View* container) { 115 const base::string16 kTestString = base::WideToUTF16(L"qwerty" 116 L"\x627\x644\x631\x626\x64A\x633\x64A\x629" 117 L"asdfgh"); 118 119 render_text_view_ = new RenderTextView(); 120 render_text_view_->SetText(kTestString); 121 122 label_ = new Label(); 123 label_->SetText(kTestString); 124 label_->SetMultiLine(true); 125 label_->SetBorder(Border::CreateSolidBorder(2, SK_ColorCYAN)); 126 127 label_checkbox_ = new Checkbox(ASCIIToUTF16("views::Label:")); 128 label_checkbox_->SetChecked(true); 129 label_checkbox_->set_listener(this); 130 label_checkbox_->set_request_focus_on_press(false); 131 132 textfield_ = new Textfield(); 133 textfield_->set_controller(this); 134 textfield_->SetText(kTestString); 135 136 GridLayout* layout = new GridLayout(container); 137 container->SetLayoutManager(layout); 138 139 ColumnSet* column_set = layout->AddColumnSet(0); 140 column_set->AddColumn(GridLayout::LEADING, GridLayout::CENTER, 141 0.0f, GridLayout::USE_PREF, 0, 0); 142 column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 143 1.0f, GridLayout::FIXED, 0, 0); 144 145 layout->StartRow(0, 0); 146 layout->AddView(new Label(ASCIIToUTF16("gfx::RenderText:"))); 147 layout->AddView(render_text_view_); 148 149 layout->StartRow(0, 0); 150 layout->AddView(label_checkbox_); 151 layout->AddView(label_); 152 153 layout->StartRow(0, 0); 154 layout->AddView(new Label(ASCIIToUTF16("Sample Text:"))); 155 layout->AddView(textfield_); 156 } 157 158 void MultilineExample::ContentsChanged(Textfield* sender, 159 const base::string16& new_contents) { 160 render_text_view_->SetText(new_contents); 161 if (label_checkbox_->checked()) 162 label_->SetText(new_contents); 163 container()->Layout(); 164 container()->SchedulePaint(); 165 } 166 167 bool MultilineExample::HandleKeyEvent(Textfield* sender, 168 const ui::KeyEvent& key_event) { 169 return false; 170 } 171 172 void MultilineExample::ButtonPressed(Button* sender, const ui::Event& event) { 173 DCHECK_EQ(sender, label_checkbox_); 174 label_->SetText(label_checkbox_->checked() ? textfield_->text() : 175 base::string16()); 176 container()->Layout(); 177 container()->SchedulePaint(); 178 } 179 180 } // namespace examples 181 } // namespace views 182
