touch.md

title	page_title	description	slug	tags	position
Touch	Touch	The RadSyntaxEditor comes with out-of-the-box support for touch gestures.	radsyntaxeditor-touch	touch,radsyntaxeditor	6

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.

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.

[C#] Example 1: Default InitializeTouch method

{{region cs-radsyntaxeditor-touch-0}}

    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
    }

{{endregion}}

You can read the [following article]({%slug touchmanager-events%}) 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.

[C#] Example 2: Increase markers drag area

{{region cs-radsyntaxeditor-touch-1}}

this.syntaxEditor.TouchMarkerDragDistance = 40;

{{endregion}}

See Also

• [Events]({%slug radsyntaxeditor-events%})
• [Commands]({%slug radsyntaxeditor-commands%})