[Feature] Allow more complexe gestures

[ndegheselle]

Hi, would like to have more customizable / complexe gestures for states.

Problem : Users are used to the navigation of softwares like photoshop or paint.net and want the same feel (Ctrl + Scroll = zoom, Left Click + Space = Pan, Scroll = Pan vertically, Scroll + Shift = Pan horizontally).

Solution : Allow more complexe gestures on states :

• Mix mouse and keyboard events (for Left Click + Space)
• Separate handling of vertical and horizontal panning

Here is a fork feature/extended-gestures where I did one possible implementation of that, there is still some things that could be checked :

• Handling panning with keyboard
• Regroup the pan vertical / horizontal gestures like the SelectionGestures

Unrelated in the fork : I also added custom cursors for panning which is unrelated but would be cool

[miroiu]

Hi, the following code allows zooming with Ctrl + Scroll and panning with Space + Left Click in the playground app:

Click to expand code block

```csharp public partial class NodifyEditorView : UserControl { public NodifyEditor EditorInstance => Editor; private EditorGestures DefaultEditorGestures { get; set; } public NodifyEditorView() { InitializeComponent(); DefaultEditorGestures = new EditorGestures(); DefaultEditorGestures.Editor.ZoomModifierKey = ModifierKeys.Control; EditorGestures.Mappings.Apply(DefaultEditorGestures); } private void Minimap_Zoom(object sender, ZoomEventArgs e) { EditorInstance.ZoomAtPosition(e.Zoom, e.Location); } protected override void OnKeyDown(KeyEventArgs e) { if (e.Key == Key.Space) { EditorGestures.Mappings.Apply(PanningGestureMappings.Instance); Cursor = Cursors.Hand; } } protected override void OnKeyUp(KeyEventArgs e) { if (e.Key == Key.Space) { EditorGestures.Mappings.Apply(DefaultEditorGestures); Cursor = Cursors.Arrow; } } } internal class PanningGestureMappings : EditorGestures { public static readonly PanningGestureMappings Instance = new PanningGestureMappings(); public PanningGestureMappings() { Editor.Pan.Value = new AnyGesture(new MouseGesture(MouseAction.LeftClick)); Editor.Selection.Apply(SelectionGestures.None); Editor.Cutting.Value = MultiGesture.None; ItemContainer.Selection.Apply(SelectionGestures.None); ItemContainer.Drag.Value = MultiGesture.None; Connector.Connect.Value = MultiGesture.None; } } ```

Things I need to think about:

• allow clicking through ItemContainer and Connector while in panning mode
• ~pan with scroll wheel~ - fixed in #147