ui/views/controls/message_box_view.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/controls/message_box_view.h"
   6
   7 #include "base/i18n/rtl.h"
   8 #include "base/message_loop/message_loop.h"
   9 #include "base/strings/string_split.h"
  10 #include "base/strings/utf_string_conversions.h"
  11 #include "ui/accessibility/ax_view_state.h"
  12 #include "ui/base/clipboard/clipboard.h"
  13 #include "ui/base/clipboard/scoped_clipboard_writer.h"
  14 #include "ui/views/controls/button/checkbox.h"
  15 #include "ui/views/controls/label.h"
  16 #include "ui/views/controls/link.h"
  17 #include "ui/views/controls/scroll_view.h"
  18 #include "ui/views/controls/textfield/textfield.h"
  19 #include "ui/views/layout/box_layout.h"
  20 #include "ui/views/layout/grid_layout.h"
  21 #include "ui/views/layout/layout_constants.h"
  22 #include "ui/views/widget/widget.h"
  23 #include "ui/views/window/client_view.h"
  24 #include "ui/views/window/dialog_delegate.h"
  25
  26 namespace {
  27
  28 const int kDefaultMessageWidth = 320;
  29
  30 // Paragraph separators are defined in
  31 // http://www.unicode.org/Public/6.0.0/ucd/extracted/DerivedBidiClass.txt
  32 //
  33 // # Bidi_Class=Paragraph_Separator
  34 //
  35 // 000A          ; B # Cc       <control-000A>
  36 // 000D          ; B # Cc       <control-000D>
  37 // 001C..001E    ; B # Cc   [3] <control-001C>..<control-001E>
  38 // 0085          ; B # Cc       <control-0085>
  39 // 2029          ; B # Zp       PARAGRAPH SEPARATOR
  40 bool IsParagraphSeparator(base::char16 c) {
  41   return ( c == 0x000A || c == 0x000D || c == 0x001C || c == 0x001D ||
  42            c == 0x001E || c == 0x0085 || c == 0x2029);
  43 }
  44
  45 // Splits |text| into a vector of paragraphs.
  46 // Given an example "\nabc\ndef\n\n\nhij\n", the split results should be:
  47 // "", "abc", "def", "", "", "hij", and "".
  48 void SplitStringIntoParagraphs(const base::string16& text,
  49                                std::vector<base::string16>* paragraphs) {
  50   paragraphs->clear();
  51
  52   size_t start = 0;
  53   for (size_t i = 0; i < text.length(); ++i) {
  54     if (IsParagraphSeparator(text[i])) {
  55       paragraphs->push_back(text.substr(start, i - start));
  56       start = i + 1;
  57     }
  58   }
  59   paragraphs->push_back(text.substr(start, text.length() - start));
  60 }
  61
  62 }  // namespace
  63
  64 namespace views {
  65
  66 ///////////////////////////////////////////////////////////////////////////////
  67 // MessageBoxView, public:
  68
  69 MessageBoxView::InitParams::InitParams(const base::string16& message)
  70     : options(NO_OPTIONS),
  71       message(message),
  72       message_width(kDefaultMessageWidth),
  73       inter_row_vertical_spacing(kRelatedControlVerticalSpacing) {}
  74
  75 MessageBoxView::InitParams::~InitParams() {
  76 }
  77
  78 MessageBoxView::MessageBoxView(const InitParams& params)
  79     : prompt_field_(NULL),
  80       checkbox_(NULL),
  81       link_(NULL),
  82       message_width_(params.message_width) {
  83   Init(params);
  84 }
  85
  86 MessageBoxView::~MessageBoxView() {}
  87
  88 base::string16 MessageBoxView::GetInputText() {
  89   return prompt_field_ ? prompt_field_->text() : base::string16();
  90 }
  91
  92 bool MessageBoxView::IsCheckBoxSelected() {
  93   return checkbox_ ? checkbox_->checked() : false;
  94 }
  95
  96 void MessageBoxView::SetCheckBoxLabel(const base::string16& label) {
  97   if (!checkbox_)
  98     checkbox_ = new Checkbox(label);
  99   else
 100     checkbox_->SetText(label);
 101   ResetLayoutManager();
 102 }
 103
 104 void MessageBoxView::SetCheckBoxSelected(bool selected) {
 105   if (!checkbox_)
 106     return;
 107   checkbox_->SetChecked(selected);
 108 }
 109
 110 void MessageBoxView::SetLink(const base::string16& text,
 111                              LinkListener* listener) {
 112   if (text.empty()) {
 113     DCHECK(!listener);
 114     delete link_;
 115     link_ = NULL;
 116   } else {
 117     DCHECK(listener);
 118     if (!link_) {
 119       link_ = new Link();
 120       link_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 121     }
 122     link_->SetText(text);
 123     link_->set_listener(listener);
 124   }
 125   ResetLayoutManager();
 126 }
 127
 128 void MessageBoxView::GetAccessibleState(ui::AXViewState* state) {
 129   state->role = ui::AX_ROLE_ALERT;
 130 }
 131
 132 ///////////////////////////////////////////////////////////////////////////////
 133 // MessageBoxView, View overrides:
 134
 135 void MessageBoxView::ViewHierarchyChanged(
 136     const ViewHierarchyChangedDetails& details) {
 137   if (details.child == this && details.is_add) {
 138     if (prompt_field_)
 139       prompt_field_->SelectAll(true);
 140
 141     NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 142   }
 143 }
 144
 145 bool MessageBoxView::AcceleratorPressed(const ui::Accelerator& accelerator) {
 146   // We only accepts Ctrl-C.
 147   DCHECK(accelerator.key_code() == 'C' && accelerator.IsCtrlDown());
 148
 149   // We must not intercept Ctrl-C when we have a text box and it's focused.
 150   if (prompt_field_ && prompt_field_->HasFocus())
 151     return false;
 152
 153   ui::ScopedClipboardWriter scw(ui::CLIPBOARD_TYPE_COPY_PASTE);
 154   base::string16 text = message_labels_[0]->text();
 155   for (size_t i = 1; i < message_labels_.size(); ++i)
 156     text += message_labels_[i]->text();
 157   scw.WriteText(text);
 158   return true;
 159 }
 160
 161 ///////////////////////////////////////////////////////////////////////////////
 162 // MessageBoxView, private:
 163
 164 void MessageBoxView::Init(const InitParams& params) {
 165   if (params.options & DETECT_DIRECTIONALITY) {
 166     std::vector<base::string16> texts;
 167     SplitStringIntoParagraphs(params.message, &texts);
 168     for (size_t i = 0; i < texts.size(); ++i) {
 169       Label* message_label = new Label(texts[i]);
 170       // Avoid empty multi-line labels, which have a height of 0.
 171       message_label->SetMultiLine(!texts[i].empty());
 172       message_label->SetAllowCharacterBreak(true);
 173       message_label->SetHorizontalAlignment(gfx::ALIGN_TO_HEAD);
 174       message_labels_.push_back(message_label);
 175     }
 176   } else {
 177     Label* message_label = new Label(params.message);
 178     message_label->SetMultiLine(true);
 179     message_label->SetAllowCharacterBreak(true);
 180     message_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 181     message_labels_.push_back(message_label);
 182   }
 183
 184   if (params.options & HAS_PROMPT_FIELD) {
 185     prompt_field_ = new Textfield;
 186     prompt_field_->SetText(params.default_prompt);
 187   }
 188
 189   inter_row_vertical_spacing_ = params.inter_row_vertical_spacing;
 190
 191   ResetLayoutManager();
 192 }
 193
 194 void MessageBoxView::ResetLayoutManager() {
 195   // Initialize the Grid Layout Manager used for this dialog box.
 196   GridLayout* layout = GridLayout::CreatePanel(this);
 197   SetLayoutManager(layout);
 198
 199   // Add the column set for the message displayed at the top of the dialog box.
 200   const int message_column_view_set_id = 0;
 201   ColumnSet* column_set = layout->AddColumnSet(message_column_view_set_id);
 202   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
 203                         GridLayout::FIXED, message_width_, 0);
 204
 205   // Column set for extra elements, if any.
 206   const int extra_column_view_set_id = 1;
 207   if (prompt_field_ || checkbox_ || link_) {
 208     column_set = layout->AddColumnSet(extra_column_view_set_id);
 209     column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
 210                           GridLayout::USE_PREF, 0, 0);
 211   }
 212
 213   const int kMaxScrollViewHeight = 600;
 214   views::View* message_contents = new views::View();
 215   message_contents->SetLayoutManager(
 216       new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));
 217   for (size_t i = 0; i < message_labels_.size(); ++i)
 218     message_contents->AddChildView(message_labels_[i]);
 219   ScrollView* scroll_view = new views::ScrollView();
 220   scroll_view->ClipHeightTo(0, kMaxScrollViewHeight);
 221   scroll_view->SetContents(message_contents);
 222   layout->StartRow(0, message_column_view_set_id);
 223   layout->AddView(scroll_view);
 224
 225   if (prompt_field_) {
 226     layout->AddPaddingRow(0, inter_row_vertical_spacing_);
 227     layout->StartRow(0, extra_column_view_set_id);
 228     layout->AddView(prompt_field_);
 229   }
 230
 231   if (checkbox_) {
 232     layout->AddPaddingRow(0, inter_row_vertical_spacing_);
 233     layout->StartRow(0, extra_column_view_set_id);
 234     layout->AddView(checkbox_);
 235   }
 236
 237   if (link_) {
 238     layout->AddPaddingRow(0, inter_row_vertical_spacing_);
 239     layout->StartRow(0, extra_column_view_set_id);
 240     layout->AddView(link_);
 241   }
 242 }
 243
 244 }  // namespace views