Merge pull request #344 from sevoku/add-text-cursor-selection

[MAC] add missing cursor position and selection support to TextEntryBackend

Xwt.Mac/Xwt.Mac/ComboBoxEntryBackend.cs

@@ -102,6 +102,9 @@ namespace Xwt.Mac
 		ITextEntryEventSink entryEventSink;
 		ApplicationContext context;
 
+		int cacheSelectionStart, cacheSelectionLength;
+		bool checkMouseMovement;
+
 		public MacComboBox (IComboBoxEventSink eventSink, ApplicationContext context)
 		{
 			this.context = context;
@@ -127,6 +130,125 @@ namespace Xwt.Mac
 			if (entryEventSink != null) {
 				context.InvokeUserCode (delegate {
 					entryEventSink.OnChanged ();
+					entryEventSink.OnSelectionChanged ();
+				});
+			}
+		}
+		public override void KeyUp (NSEvent theEvent)
+		{
+			base.KeyUp (theEvent);
+			HandleSelectionChanged ();
+		}
+
+
+		NSTrackingArea trackingArea;
+		public override void UpdateTrackingAreas ()
+		{
+			if (trackingArea != null) {
+				RemoveTrackingArea (trackingArea);
+				trackingArea.Dispose ();
+			}
+			System.Drawing.RectangleF viewBounds = this.Bounds;
+			var options = NSTrackingAreaOptions.MouseMoved | NSTrackingAreaOptions.ActiveInKeyWindow | NSTrackingAreaOptions.MouseEnteredAndExited;
+			trackingArea = new NSTrackingArea (viewBounds, options, this, null);
+			AddTrackingArea (trackingArea);
+		}
+
+		public override void RightMouseDown (NSEvent theEvent)
+		{
+			base.RightMouseDown (theEvent);
+			var p = ConvertPointFromView (theEvent.LocationInWindow, null);
+			ButtonEventArgs args = new ButtonEventArgs ();
+			args.X = p.X;
+			args.Y = p.Y;
+			args.Button = PointerButton.Right;
+			context.InvokeUserCode (delegate {
+				eventSink.OnButtonPressed (args);
+			});
+		}
+
+		public override void RightMouseUp (NSEvent theEvent)
+		{
+			base.RightMouseUp (theEvent);
+			var p = ConvertPointFromView (theEvent.LocationInWindow, null);
+			ButtonEventArgs args = new ButtonEventArgs ();
+			args.X = p.X;
+			args.Y = p.Y;
+			args.Button = PointerButton.Right;
+			context.InvokeUserCode (delegate {
+				eventSink.OnButtonReleased (args);
+			});
+		}
+
+		public override void MouseDown (NSEvent theEvent)
+		{
+			base.MouseDown (theEvent);
+			var p = ConvertPointFromView (theEvent.LocationInWindow, null);
+			ButtonEventArgs args = new ButtonEventArgs ();
+			args.X = p.X;
+			args.Y = p.Y;
+			args.Button = PointerButton.Left;
+			context.InvokeUserCode (delegate {
+				eventSink.OnButtonPressed (args);
+			});
+		}
+
+		public override void MouseUp (NSEvent theEvent)
+		{
+			base.MouseUp (theEvent);
+			var p = ConvertPointFromView (theEvent.LocationInWindow, null);
+			ButtonEventArgs args = new ButtonEventArgs ();
+			args.X = p.X;
+			args.Y = p.Y;
+			args.Button = (PointerButton) theEvent.ButtonNumber + 1;
+			context.InvokeUserCode (delegate {
+				eventSink.OnButtonReleased (args);
+			});
+		}
+
+		public override void MouseEntered (NSEvent theEvent)
+		{
+			base.MouseEntered (theEvent);
+			checkMouseMovement = true;
+			context.InvokeUserCode (delegate {
+				eventSink.OnMouseEntered ();
+			});
+		}
+
+		public override void MouseExited (NSEvent theEvent)
+		{
+			base.MouseExited (theEvent);
+			context.InvokeUserCode (delegate {
+				eventSink.OnMouseExited ();
+			});
+			checkMouseMovement = false;
+			HandleSelectionChanged ();
+		}
+
+		public override void MouseMoved (NSEvent theEvent)
+		{
+			base.MouseMoved (theEvent);
+			if (!checkMouseMovement)
+				return;
+			var p = ConvertPointFromView (theEvent.LocationInWindow, null);
+			MouseMovedEventArgs args = new MouseMovedEventArgs ((long) TimeSpan.FromSeconds (theEvent.Timestamp).TotalMilliseconds, p.X, p.Y);
+			context.InvokeUserCode (delegate {
+				eventSink.OnMouseMoved (args);
+			});
+			if (checkMouseMovement)
+				HandleSelectionChanged ();
+		}
+
+		void HandleSelectionChanged ()
+		{
+			if (entryEventSink == null || CurrentEditor == null)
+				return;
+			if (cacheSelectionStart != CurrentEditor.SelectedRange.Location ||
+			    cacheSelectionLength != CurrentEditor.SelectedRange.Length) {
+				cacheSelectionStart = CurrentEditor.SelectedRange.Location;
+				cacheSelectionLength = CurrentEditor.SelectedRange.Length;
+				context.InvokeUserCode (delegate {
+					entryEventSink.OnSelectionChanged ();
 				});
 			}
 		}

Xwt.Mac/Xwt.Mac/TextEntryBackend.cs

@@ -32,6 +32,9 @@ namespace Xwt.Mac
 {
 	public class TextEntryBackend: ViewBackend<NSView,ITextEntryEventSink>, ITextEntryBackend
 	{
+		int cacheSelectionStart, cacheSelectionLength;
+		bool checkMouseSelection;
+
 		public TextEntryBackend ()
 		{
 		}
@@ -51,6 +54,18 @@ namespace Xwt.Mac
 				ViewObject = new CustomAlignedContainer (EventSink, ApplicationContext, (NSView)view);
 				MultiLine = false;
 			}
+
+			Frontend.MouseEntered += delegate {
+				checkMouseSelection = true;
+			};
+			Frontend.MouseExited += delegate {
+				checkMouseSelection = false;
+				HandleSelectionChanged ();
+			};
+			Frontend.MouseMoved += delegate {
+				if (checkMouseSelection)
+					HandleSelectionChanged ();
+			};
 		}
 		
 		protected override void OnSizeToFit ()
@@ -140,13 +155,78 @@ namespace Xwt.Mac
 			}
 		}
 
-		public int CursorPosition { get; set; }
+		public int CursorPosition { 
+			get {
+				if (Widget.CurrentEditor == null)
+					return 0;
+				return Widget.CurrentEditor.SelectedRange.Location;
+			}
+			set {
+				Widget.CurrentEditor.SelectedRange = new MonoMac.Foundation.NSRange (value, SelectionLength);
+				HandleSelectionChanged ();
+			}
+		}
 
-		public int SelectionStart { get; set; }
+		public int SelectionStart { 
+			get {
+				if (Widget.CurrentEditor == null)
+					return 0;
+				return Widget.CurrentEditor.SelectedRange.Location;
+			}
+			set {
+				Widget.CurrentEditor.SelectedRange = new MonoMac.Foundation.NSRange (value, SelectionLength);
+				HandleSelectionChanged ();
+			}
+		}
 
-		public int SelectionLength { get; set; }
+		public int SelectionLength { 
+			get {
+				if (Widget.CurrentEditor == null)
+					return 0;
+				return Widget.CurrentEditor.SelectedRange.Length;
+			}
+			set {
+				Widget.CurrentEditor.SelectedRange = new MonoMac.Foundation.NSRange (SelectionStart, value);
+				HandleSelectionChanged ();
+			}
+		}
 
-		public string SelectedText { get; set; }
+		public string SelectedText { 
+			get {
+				if (Widget.CurrentEditor == null)
+					return String.Empty;
+				int start = SelectionStart;
+				int end = start + SelectionLength;
+				if (start == end) return String.Empty;
+				try {
+					return Text.Substring (start, end - start);
+				} catch {
+					return String.Empty;
+				}
+			}
+			set {
+				int cacheSelStart = SelectionStart;
+				int pos = cacheSelStart;
+				if (SelectionLength > 0) {
+					Text = Text.Remove (pos, SelectionLength).Insert (pos, value);
+				}
+				SelectionStart = pos;
+				SelectionLength = value.Length;
+				HandleSelectionChanged ();
+			}
+		}
+
+		void HandleSelectionChanged ()
+		{
+			if (cacheSelectionStart != SelectionStart ||
+			    cacheSelectionLength != SelectionLength) {
+				cacheSelectionStart = SelectionStart;
+				cacheSelectionLength = SelectionLength;
+				ApplicationContext.InvokeUserCode (delegate {
+					EventSink.OnSelectionChanged ();
+				});
+			}
+		}
 
 		public override void SetFocus ()
 		{
@@ -179,8 +259,20 @@ namespace Xwt.Mac
 			base.DidChange (notification);
 			context.InvokeUserCode (delegate {
 				eventSink.OnChanged ();
+				eventSink.OnSelectionChanged ();
 			});
 		}
+
+		int cachedCursorPosition;
+		public override void KeyUp (NSEvent theEvent)
+		{
+			base.KeyUp (theEvent);
+			if (cachedCursorPosition != CurrentEditor.SelectedRange.Location)
+				context.InvokeUserCode (delegate {
+				eventSink.OnSelectionChanged ();
+			});
+			cachedCursorPosition = CurrentEditor.SelectedRange.Location;
+		}
 	}
 }