New ScrollControl class

This class is used instead of ScrollAdjustment for getting information about
scroll position and extents of a widget.

3 files changed, 121 insertions, 4 deletions

diff --git a/Xwt.Mac/Xwt.Mac.csproj b/Xwt.Mac/Xwt.Mac.csproj
index 9921e770..ecafc808 100644
--- a/Xwt.Mac/Xwt.Mac.csproj
+++ b/Xwt.Mac/Xwt.Mac.csproj
@@ -126,6 +126,7 @@
     <Compile Include="Xwt.Mac\MacKeyboardHandler.cs" />
     <Compile Include="Xwt.Mac\PasswordEntryBackend.cs" />
     <Compile Include="Xwt.Mac\WebViewBackend.cs" />
+    <Compile Include="Xwt.Mac\ScrollControlBackend.cs" />
   </ItemGroup>
   <Import Project="..\BuildHelpers.targets" />
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
diff --git a/Xwt.Mac/Xwt.Mac/ScrollControlBackend.cs b/Xwt.Mac/Xwt.Mac/ScrollControlBackend.cs
new file mode 100644
index 00000000..27c0361e
--- /dev/null
+++ b/Xwt.Mac/Xwt.Mac/ScrollControlBackend.cs
@@ -0,0 +1,116 @@
+// 
+// ScrollControlBackend.cs
+//  
+// Author:
+//       Lluis Sanchez <lluis@xamarin.com>
+// 
+// Copyright (c) 2012 Xamarin Inc
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+using System;
+using Xwt.Backends;
+using MonoMac.AppKit;
+
+
+namespace Xwt.Mac
+{
+	class ScrollControlBackend: IScrollControlBackend
+	{
+		bool vertical;
+		NSScrollView scrollView;
+		IScrollControlEventSink eventSink;
+
+		public ScrollControlBackend (NSScrollView scrollView, bool vertical)
+		{
+			this.vertical = vertical;
+			this.scrollView = scrollView;
+		}
+
+		#region IBackend implementation
+		public void InitializeBackend (object frontend, ApplicationContext context)
+		{
+		}
+
+		public void EnableEvent (object eventId)
+		{
+		}
+
+		public void DisableEvent (object eventId)
+		{
+		}
+		#endregion
+
+		public void NotifyValueChanged ()
+		{
+			eventSink.OnValueChanged ();
+		}
+
+		#region IScrollAdjustmentBackend implementation
+		public void Initialize (IScrollControlEventSink eventSink)
+		{
+			this.eventSink = eventSink;
+		}
+
+		public double Value {
+			get {
+				if (vertical)
+					return scrollView.DocumentVisibleRect.Y;
+				else
+					return scrollView.DocumentVisibleRect.X;
+			}
+			set {
+				if (vertical)
+					scrollView.ScrollPoint (new System.Drawing.PointF (scrollView.DocumentVisibleRect.X, (float)value));
+				else
+					scrollView.ScrollPoint (new System.Drawing.PointF ((float)value, scrollView.DocumentVisibleRect.Y));
+				scrollView.ReflectScrolledClipView (scrollView.ContentView);
+			}
+		}
+
+		public double LowerValue {
+			get {
+				return 0;
+			}
+		}
+
+		public double UpperValue {
+			get { return vertical ? scrollView.ContentSize.Height : scrollView.ContentSize.Width; }
+		}
+
+		public double PageIncrement {
+			get {
+				return vertical ? scrollView.VerticalPageScroll : scrollView.HorizontalPageScroll;
+			}
+		}
+
+		public double PageSize {
+			get {
+				return vertical ? scrollView.DocumentVisibleRect.Height : scrollView.DocumentVisibleRect.Width;
+			}
+		}
+
+		public double StepIncrement {
+			get {
+				return vertical ? scrollView.VerticalLineScroll : scrollView.HorizontalLineScroll;
+			}
+		}
+		#endregion
+	}
+}
+
diff --git a/Xwt.Mac/Xwt.Mac/TableViewBackend.cs b/Xwt.Mac/Xwt.Mac/TableViewBackend.cs
index 331248b4..e50d2ae3 100644
--- a/Xwt.Mac/Xwt.Mac/TableViewBackend.cs
+++ b/Xwt.Mac/Xwt.Mac/TableViewBackend.cs
@@ -113,14 +113,14 @@ namespace Xwt.Mac
 			}
 		}
 
-		public IScrollAdjustmentBackend CreateVerticalScrollAdjustment ()
+		public IScrollControlBackend CreateVerticalScrollControl ()
 		{
-			return new ScrollAdjustmentBackend (scroll, true);
+			return new ScrollControlBackend (scroll, true);
 		}
 
-		public IScrollAdjustmentBackend CreateHorizontalScrollAdjustment ()
+		public IScrollControlBackend CreateHorizontalScrollControl ()
 		{
-			return new ScrollAdjustmentBackend (scroll, false);
+			return new ScrollControlBackend (scroll, false);
 		}
 
 		protected override Size GetNaturalSize ()