Annotation Creation Click Drag instead of two clicks

Answered

Hi, in the Dynamically Create Annotations demo, the method on how annotations are created is by (for example a line):

1) First Click on the annotation button
2) Click on the SciChart Surface. This creates the first point of a line
3) Click again on the end point of the line.

Instead of having to do two clicks, is there a way to click and drag instead? eg.

1) First Click on the annotation button
2) Click on the SciChart Surface. This creates the first point of a line
3) drag to the end point of the line.

I just want to mimic Microsoft power point behaviour as our users are more familiar with it.

Thanks

WPF Annotations

Azrin Sani asked 5 years ago

You must login to post comments

Answers (2)

Best Answer

This is useful, our users also complained about the nonstandard two click process to add annotations. However using this modification causes a crash upon adding HorizontalLineAnnotation and VerticalLineAnnotation, and TextAnnotation does not work either. As these annotations work fine with 1 click, there is an easy workaround for this of course:

public class CustomAnnotationCreationModifier : AnnotationCreationModifier
{
    public override void OnModifierMouseDown(ModifierMouseArgs e)
    {
        if (AnnotationType != typeof (TextAnnotation)
            && AnnotationType != typeof (HorizontalLineAnnotation)
            && AnnotationType != typeof (VerticalLineAnnotation))
        {
            OnModifierMouseUp(e);
        }
    }
}

jack.parkinson@shell.com answered 5 years ago

You must login to post comments

Hi Azrin,

Thanks for writing to us. To achive desired behavior please try to create custom AnnotationCreationModifier with next code:

public class CustomAnnotationCreationModifier : AnnotationCreationModifier
{
    public override void OnModifierMouseDown(ModifierMouseArgs e)
    {
        OnModifierMouseUp(e);
    }
}

By default AnnotationCreationModifier uses only mouse up event. When first mouse up occurs – modifier creates and places annotation, on second mouse up – annotation is fully created and AnnotationCreated event fires. With provided code – annotation is created when mouse down occurs and AnnotationCreated event is raised on mouse up event.