Touch

The RadSyntaxEditor comes with out-of-the-box support for touch gestures.

When using touch, touch selector markers appear when the user taps on the editor. Swiping 30 pixels around them moves the selection's start/end. Switching to a mouse device hides the markers. The markers are also hidden during a swipe or pinch. Swiping over the line numbers selects each of the lines the swipe passes over.

RadSyntaxEditor Touch Support

Supported Touch Gestures

Gesture RadSyntaxEditor Action
Tap Moves the caret under the finger
Double Tap Selects the word under the finger
Pinch Scales the document (the ScaleFactor changes)
Swipe Scrolls the document
Swipe inertia Scrolls the document continuously with increased speed

Override Default Touch Logic

If you wish to implement your own touch logic, you can override the InitializeTouch method of the RadSyntaxEditor.

Example 1: Default InitializeTouch method

    protected override void InitializeTouch(SyntaxEditorPresenter presenter) 
    { 
        TouchManager.AddSwipeEventHandler(presenter, new SwipeEventHandler(OnSwipe)); 
        base.InitializeTouch(presenter); 
    } 
 
    private void OnSwipe(object sender, SwipeEventArgs args) 
    { 
        // your custom logic for swiping 
        args.Handled = true; // you can omit this if your custom logic does not contradict with the default logic 
    } 

You can read the following article article, which describes all of the events exposed by the TouchManager.

Increase Markers Drag Area

By default, dragging the markers is possible if the swipe occurs up to 30 pixels from their center. This area can be controlled via the TouchMarkerDragDistance property of the RadSyntaxEditor control.

Example 2: Increase markers drag area

this.syntaxEditor.TouchMarkerDragDistance = 40; 

See Also

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