class/System.Windows/System.Windows.Controls/TextBox.cs

   1 //
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   4 //
   5 // Copyright (C) 2007 Novell, Inc (http://www.novell.com)
   6 //
   7 // Permission is hereby granted, free of charge, to any person obtaining
   8 // a copy of this software and associated documentation files (the
   9 // "Software"), to deal in the Software without restriction, including
  10 // without limitation the rights to use, copy, modify, merge, publish,
  11 // distribute, sublicense, and/or sell copies of the Software, and to
  12 // permit persons to whom the Software is furnished to do so, subject to
  13 // the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be
  16 // included in all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  22 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using Mono;
  28 using System.Windows;
  29 using System.Windows.Automation.Peers;
  30 using System.Windows.Input;
  31 using System.Windows.Media;
  32 using System.Windows.Documents;
  33 using System.Collections.Generic;
  34
  35 namespace System.Windows.Controls {
  36
  37         [TemplateVisualStateAttribute (Name = "Disabled",       GroupName = "CommonStates")]
  38         [TemplateVisualStateAttribute (Name = "Normal",         GroupName = "CommonStates")]
  39         [TemplateVisualStateAttribute (Name = "MouseOver",      GroupName = "CommonStates")]
  40         [TemplateVisualStateAttribute (Name = "ReadOnly",       GroupName = "CommonStates")]
  41         [TemplateVisualStateAttribute (Name = "Focused",        GroupName = "FocusStates")]
  42         [TemplateVisualStateAttribute (Name = "Unfocused",      GroupName = "FocusStates")]
  43         [TemplatePartAttribute (Name = "ContentElement",                Type = typeof (FrameworkElement))]
  44         [TemplatePartAttribute (Name = "DisabledVisualElement", Type = typeof (FrameworkElement))]
  45         [TemplatePartAttribute (Name = "FocusVisualElement",    Type = typeof (FrameworkElement))]
  46         [TemplatePartAttribute (Name = "ReadOnlyVisualElement", Type = typeof (FrameworkElement))]
  47         [TemplatePartAttribute (Name = "RootElement",                   Type = typeof (FrameworkElement))]
  48         public partial class TextBox : Control {
  49                 object contentElement;
  50
  51                 bool IsFocused {
  52                         get; set;
  53                 }
  54
  55                 bool IsMouseOver {
  56                         get; set;
  57                 }
  58
  59                 internal override void Initialize ()
  60                 {
  61                         base.Initialize ();
  62
  63                         CursorPositionChanged += OnCursorPositionChanged;
  64                         IsEnabledChanged += delegate { ChangeVisualState (); };
  65                         Loaded += delegate { ChangeVisualState (); };
  66                 }
  67
  68                 internal override void InvokeKeyDown (KeyEventArgs k)
  69                 {
  70                         base.InvokeKeyDown (k);
  71
  72                         if (!k.Handled)
  73                                 NativeMethods.text_box_base_on_character_key_down (native, k.NativeHandle);
  74                 }
  75
  76                 protected override void OnKeyDown (KeyEventArgs k)
  77                 {
  78                         // Chain up to our parent first, so that TabNavigation
  79                         // works as well as allowing developers to filter our
  80                         // input.
  81                         base.OnKeyDown (k);
  82
  83                         if (!k.Handled)
  84                                 NativeMethods.text_box_base_on_key_down (native, k.NativeHandle);
  85                 }
  86
  87                 protected override void OnKeyUp (KeyEventArgs k)
  88                 {
  89                         base.OnKeyUp (k);
  90
  91                         if (!k.Handled)
  92                                 NativeMethods.text_box_base_on_key_up (native, k.NativeHandle);
  93                 }
  94
  95                 protected override void OnMouseLeftButtonDown (MouseButtonEventArgs e)
  96                 {
  97                         if (!e.Handled)
  98                                 NativeMethods.text_box_base_on_mouse_left_button_down (native, e.NativeHandle);
  99
 100                         base.OnMouseLeftButtonDown (e);
 101                 }
 102
 103                 protected override void OnMouseLeftButtonUp (MouseButtonEventArgs e)
 104                 {
 105                         if (!e.Handled)
 106                                 NativeMethods.text_box_base_on_mouse_left_button_up (native, e.NativeHandle);
 107
 108                         base.OnMouseLeftButtonUp (e);
 109                 }
 110
 111                 protected override void OnMouseMove (MouseEventArgs e)
 112                 {
 113                         NativeMethods.text_box_base_on_mouse_move (native, e.NativeHandle);
 114                         base.OnMouseMove (e);
 115                 }
 116
 117                 protected override void OnMouseEnter (MouseEventArgs e)
 118                 {
 119                         IsMouseOver = true;
 120                         base.OnMouseEnter (e);
 121                         ChangeVisualState ();
 122                 }
 123
 124                 protected override void OnMouseLeave (MouseEventArgs e)
 125                 {
 126                         IsMouseOver = false;
 127                         base.OnMouseLeave (e);
 128                         ChangeVisualState ();
 129                 }
 130
 131                 protected override void OnGotFocus (RoutedEventArgs e)
 132                 {
 133                         IsFocused = true;
 134                         base.OnGotFocus (e);
 135                         NativeMethods.text_box_base_on_got_focus (native, e.NativeHandle);
 136                         ChangeVisualState ();
 137                 }
 138
 139                 protected override void OnLostFocus (RoutedEventArgs e)
 140                 {
 141                         IsFocused = false;
 142                         base.OnLostFocus (e);
 143                         NativeMethods.text_box_base_on_lost_focus (native, e.NativeHandle);
 144                         ChangeVisualState ();
 145                 }
 146
 147                 public string Text {
 148                         get {
 149                                 return (string)GetValue (TextProperty) ?? "";
 150                         }
 151                         set {
 152                                 if (value == null)
 153                                         throw new ArgumentNullException ("Text cannot be null");
 154                                 SetValue (TextProperty, value);
 155                         }
 156                 }
 157
 158                 public void Select (int start, int length)
 159                 {
 160                         if (start < 0)
 161                                 throw new ArgumentOutOfRangeException ("start");
 162
 163                         if (length < 0)
 164                                 throw new ArgumentOutOfRangeException ("length");
 165
 166                         NativeMethods.text_box_base_select (this.native, start, length);
 167                 }
 168
 169                 public void SelectAll ()
 170                 {
 171                         NativeMethods.text_box_base_select_all (native);
 172                 }
 173
 174                 static UnmanagedEventHandler cursor_position_changed = Events.CreateSafeHandler (cursor_position_changed_cb);
 175                 static UnmanagedEventHandler selection_changed = Events.CreateSafeHandler (selection_changed_cb);
 176                 static UnmanagedEventHandler text_changed = Events.CreateSafeHandler (text_changed_cb);
 177
 178                 static object CursorPositionChangedEvent = new object ();
 179                 static object SelectionChangedEvent = new object ();
 180                 static object TextChangedEvent = new object ();
 181
 182                 void OnCursorPositionChanged (object sender, CursorPositionChangedEventArgs args)
 183                 {
 184                         if (contentElement == null)
 185                                 contentElement = GetTemplateChild ("ContentElement");
 186
 187                         if (contentElement != null && contentElement is ScrollViewer) {
 188                                 ScrollViewer scrollview = contentElement as ScrollViewer;
 189                                 double offset = scrollview.HorizontalOffset;
 190
 191                                 // Note: for horizontal scrollage, we offset by 1.0 pixel for the width of the cursor ibeam
 192
 193                                 if (args.CursorX < offset) {
 194                                         // need to scroll to the left a bit
 195                                         scrollview.ScrollToHorizontalOffset (Math.Max (args.CursorX - 1.0, 0.0));
 196                                 } else if (args.CursorX > offset + scrollview.ViewportWidth) {
 197                                         // need to scroll to the right
 198                                         offset = (args.CursorX + 1.0) - scrollview.ViewportWidth;
 199                                         scrollview.ScrollToHorizontalOffset (offset);
 200                                 }
 201
 202                                 offset = scrollview.VerticalOffset;
 203                                 if (args.CursorY < offset) {
 204                                         // need to scroll up a bit
 205                                         scrollview.ScrollToVerticalOffset (args.CursorY);
 206                                 } else if (args.CursorY + args.CursorHeight > offset + scrollview.ViewportHeight) {
 207                                         // need to scroll down a bit
 208                                         offset = (args.CursorY + args.CursorHeight) - Math.Max (args.CursorHeight, scrollview.ViewportHeight);
 209                                         scrollview.ScrollToVerticalOffset (offset);
 210                                 }
 211                         }
 212                 }
 213
 214                 void InvokeCursorPositionChanged (CursorPositionChangedEventArgs args)
 215                 {
 216                         CursorPositionChangedEventHandler h = (CursorPositionChangedEventHandler) EventList [CursorPositionChangedEvent];
 217
 218                         if (h != null)
 219                                 h (this, args);
 220                 }
 221
 222                 static void cursor_position_changed_cb (IntPtr target, IntPtr calldata, IntPtr closure)
 223                 {
 224                         TextBox textbox = (TextBox) NativeDependencyObjectHelper.FromIntPtr (closure);
 225                         CursorPositionChangedEventArgs args = new CursorPositionChangedEventArgs (calldata);
 226
 227                         textbox.InvokeCursorPositionChanged (args);
 228                 }
 229
 230                 event CursorPositionChangedEventHandler CursorPositionChanged {
 231                         add {
 232                                 RegisterEvent (CursorPositionChangedEvent, "CursorPositionChanged", cursor_position_changed, value);
 233                         }
 234                         remove {
 235                                 UnregisterEvent (CursorPositionChangedEvent, "CursorPositionChanged", cursor_position_changed, value);
 236                         }
 237                 }
 238
 239                 void InvokeSelectionChanged (RoutedEventArgs args)
 240                 {
 241                         RoutedEventHandler h = (RoutedEventHandler) EventList [SelectionChangedEvent];
 242
 243                         if (h != null)
 244                                 h (this, args);
 245                 }
 246
 247                 static void selection_changed_cb (IntPtr target, IntPtr calldata, IntPtr closure)
 248                 {
 249                         TextBox textbox = (TextBox) NativeDependencyObjectHelper.FromIntPtr (closure);
 250                         RoutedEventArgs args = new RoutedEventArgs (calldata, false);
 251
 252                         textbox.InvokeSelectionChanged (args);
 253                 }
 254
 255                 public event RoutedEventHandler SelectionChanged {
 256                         add {
 257                                 RegisterEvent (SelectionChangedEvent, "SelectionChanged", selection_changed, value);
 258                         }
 259                         remove {
 260                                 UnregisterEvent (SelectionChangedEvent, "SelectionChanged", selection_changed, value);
 261                         }
 262                 }
 263
 264                 void InvokeTextChanged (TextChangedEventArgs args)
 265                 {
 266                         TextChangedEventHandler h = (TextChangedEventHandler) EventList [TextChangedEvent];
 267
 268                         if (h != null)
 269                                 h (this, args);
 270                 }
 271
 272                 static void text_changed_cb (IntPtr target, IntPtr calldata, IntPtr closure)
 273                 {
 274                         TextBox textbox = (TextBox) NativeDependencyObjectHelper.FromIntPtr (closure);
 275                         TextChangedEventArgs args = new TextChangedEventArgs (calldata);
 276
 277                         textbox.InvokeTextChanged (args);
 278                 }
 279
 280                 public event TextChangedEventHandler TextChanged {
 281                         add {
 282                                 RegisterEvent (TextChangedEvent, "TextChanged", text_changed, value);
 283                         }
 284                         remove {
 285                                 UnregisterEvent (TextChangedEvent, "TextChanged", text_changed, value);
 286                         }
 287                 }
 288
 289                 void ChangeVisualState ()
 290                 {
 291                         ChangeVisualState (true);
 292                 }
 293
 294                 void ChangeVisualState (bool useTransitions)
 295                 {
 296                         if (!IsEnabled) {
 297                                 VisualStateManager.GoToState (this, "Disabled", useTransitions);
 298                         } else if (IsReadOnly) {
 299                                 VisualStateManager.GoToState (this, "ReadOnly", useTransitions);
 300                         } else if (IsMouseOver) {
 301                                 VisualStateManager.GoToState (this, "MouseOver", useTransitions);
 302                         } else {
 303                                 VisualStateManager.GoToState (this, "Normal", useTransitions);
 304                         }
 305
 306                         if (IsFocused) {
 307                                 VisualStateManager.GoToState (this, "Focused", useTransitions);
 308                         } else {
 309                                 VisualStateManager.GoToState (this, "Unfocused", useTransitions);
 310                         }
 311                 }
 312
 313                 protected override AutomationPeer OnCreateAutomationPeer ()
 314                 {
 315                         return new TextBoxAutomationPeer (this);
 316                 }
 317         }
 318 }