Added support for initiating and completing click-and-drag operations using the keyboard

Author: miroiu

CHANGELOG.md

@@ -21,13 +21,13 @@
 >	- Added Select, BeginSelecting, UpdateSelection, EndSelecting, CancelSelecting and AllowSelectionCancellation to NodifyEditor
 >	- Added IsDragging, BeginDragging, UpdateDragging, EndDragging and CancelDragging to NodifyEditor
 >	- Added AlignSelection and AlignContainers methods to NodifyEditor
->	- Added HasCustomContextMenu dependency property to NodifyEditor and ItemContainer
+>	- Added HasCustomContextMenu dependency property to NodifyEditor, ItemContainer and Connector
 >	- Added Select, BeginDragging, UpdateDragging, EndDragging and CancelDragging to ItemContainer
 >	- Added PreserveSelectionOnRightClick configuration field to ItemContainer
 >	- Added BeginConnecting, UpdatePendingConnection, EndConnecting, CancelConnecting and RemoveConnections methods to Connector
 >	- Added a custom MouseGesture with support for key combinations
 >	- Added InputProcessor to NodifyEditor, ItemContainer and Connector, enabling the extension of controls with custom states
->	- Added ElementOperationState to simplify the creation of complex control states
+>	- Added DragState to simplify creating click-and-drag operations, with support for initiating and completing them using the keyboard
 >	- Move the viewport to the mouse position when zooming on the Minimap if ResizeToViewport is false
 > - Bugfixes:
 >	- Fixed an issue where the ItemContainer was selected by releasing the mouse button on it, even when the mouse was not captured
@@ -38,6 +38,7 @@
 >	- Fixed an issue where controls would capture the mouse unnecessarily; they now capture it only in response to a defined gesture
 >	- Fixed an issue where the minimap could update the viewport without having the mouse captured
 >	- Fixed ItemContainer.Select and NodifyEditor.SelectArea to clear the existing selection and select the containers within the same transaction
+>	- Fixed an issue where editor operations failed to cancel upon losing mouse capture.
 	
 #### **Version 6.6.0**
 

Nodify/Connections/Connector.cs

@@ -376,7 +376,15 @@ protected override void OnKeyUp(KeyEventArgs e)
 
         /// <inheritdoc />
         protected override void OnKeyDown(KeyEventArgs e)
-            => InputProcessor.Process(e);
+        {
+            InputProcessor.Process(e);
+
+            // Release the mouse capture if all the mouse buttons are released and there's no sticky connection pending
+            if (!IsPendingConnection && IsMouseCaptured && Mouse.RightButton == MouseButtonState.Released && Mouse.LeftButton == MouseButtonState.Released && Mouse.MiddleButton == MouseButtonState.Released)
+            {
+                ReleaseMouseCapture();
+            }
+        }
 
         #endregion
 

Nodify/ItemContainer.cs

@@ -396,7 +396,15 @@ protected override void OnLostMouseCapture(MouseEventArgs e)
 
         /// <inheritdoc />
         protected override void OnKeyUp(KeyEventArgs e)
-            => InputProcessor.Process(e);
+        {
+            InputProcessor.Process(e);
+
+            // Release the mouse capture if all the mouse buttons are released
+            if (IsMouseCaptured && Mouse.RightButton == MouseButtonState.Released && Mouse.LeftButton == MouseButtonState.Released && Mouse.MiddleButton == MouseButtonState.Released)
+            {
+                ReleaseMouseCapture();
+            }
+        }
 
         /// <inheritdoc />
         protected override void OnKeyDown(KeyEventArgs e)

Nodify/NodifyEditor.cs

@@ -837,7 +837,15 @@ protected override void OnLostMouseCapture(MouseEventArgs e)
 
         /// <inheritdoc />
         protected override void OnKeyUp(KeyEventArgs e)
-            => InputProcessor.Process(e);
+        {
+            InputProcessor.Process(e);
+
+            // Release the mouse capture if all the mouse buttons are released
+            if (IsMouseCaptured && Mouse.RightButton == MouseButtonState.Released && Mouse.LeftButton == MouseButtonState.Released && Mouse.MiddleButton == MouseButtonState.Released)
+            {
+                ReleaseMouseCapture();
+            }
+        }
 
         /// <inheritdoc />
         protected override void OnKeyDown(KeyEventArgs e)