Simple text layer with ScreenAnnotation

[Anthra]

Hi,

I'm encoutering some issue when I try to do a simple text layer for providing shortcuts to user.

I'm not able to switch visibility between two annotation using their visible attribute. When I do setCollapsed with false, the two annotations are visible.

Here is the code of my layer:

public class HelpLayer extends RenderableLayer{

    private Color color = Color.white;

    private String collapsedText = "Press 'h' to show keyboard shortcuts";
    private String expandedText  = "Press 'h' to hide keyboard shortcuts\nexpanded";

    ScreenAnnotation collapsedAnnotation;
    ScreenAnnotation expandedAnnotation;

    private boolean collapsed = true;

    public HelpLayer() {
        this.collapsedAnnotation = new ScreenAnnotation(collapsedText, new Point(50, 50));
        AnnotationAttributes annotationAttributes = new AnnotationAttributes();
        annotationAttributes.setTextColor(this.color);
        annotationAttributes.setImageSource(null);
        annotationAttributes.setFrameShape(AVKey.SHAPE_NONE);
        annotationAttributes.setAdjustWidthToText(AVKey.SIZE_FIT_TEXT);
        this.collapsedAnnotation.setAttributes(annotationAttributes);
        this.addRenderable(this.collapsedAnnotation);

        this.expandedAnnotation = new ScreenAnnotation(expandedText, new Point(50, 50));
        annotationAttributes = new AnnotationAttributes();
        annotationAttributes.setTextColor(this.color);
        annotationAttributes.setImageSource(null);
        annotationAttributes.setFrameShape(AVKey.SHAPE_NONE);
        annotationAttributes.setAdjustWidthToText(AVKey.SIZE_FIT_TEXT);
        this.expandedAnnotation.setAttributes(annotationAttributes);
        this.addRenderable(this.expandedAnnotation);

        update();
    }

    private synchronized void update()
    {
        collapsedAnnotation.getAttributes().setVisible(collapsed);
        expandedAnnotation.getAttributes().setVisible(!collapsed);
    }

    /**
     * @return the collapsed
     */
    public boolean isCollapsed() {
        return collapsed;
    }

    /**
     * @param collapsed the collapsed to set
     */
    public void setCollapsed(boolean collapsed) {
        this.collapsed = collapsed;
        update();
    }

}

Thanks in advance for all the help you could provide.

[BuM]

Hi there,

I tried your class and never experience both ScreenAnnotations at the same time.

However, often changing the Annotation has no visible effect at all, so I needed to add a redrawNow() (redraw() might work, too) to see the change immediately. Maybe this will solve your problem, too? Here are my changes:

public class HelpLayer extends RenderableLayer{

    private WorldWindow wwd;
	
    private Color color = Color.white;

    private String collapsedText = "Press 'h' to show keyboard shortcuts";
    private String expandedText  = "Press 'h' to hide keyboard shortcuts\nexpanded";

    ScreenAnnotation collapsedAnnotation;
    ScreenAnnotation expandedAnnotation;

    private boolean collapsed = true;

    public HelpLayer(WorldWindow wwd) {
    	this.wwd = wwd;
    	
        this.collapsedAnnotation = new ScreenAnnotation(collapsedText, new Point(50, 50));
        AnnotationAttributes annotationAttributes = new AnnotationAttributes();
        annotationAttributes.setTextColor(this.color);
        annotationAttributes.setImageSource(null);
        annotationAttributes.setFrameShape(AVKey.SHAPE_NONE);
        annotationAttributes.setAdjustWidthToText(AVKey.SIZE_FIT_TEXT);
        this.collapsedAnnotation.setAttributes(annotationAttributes);
        this.addRenderable(this.collapsedAnnotation);

        this.expandedAnnotation = new ScreenAnnotation(expandedText, new Point(50, 50));
        annotationAttributes = new AnnotationAttributes();
        annotationAttributes.setTextColor(this.color);
        annotationAttributes.setImageSource(null);
        annotationAttributes.setFrameShape(AVKey.SHAPE_NONE);
        annotationAttributes.setAdjustWidthToText(AVKey.SIZE_FIT_TEXT);
        this.expandedAnnotation.setAttributes(annotationAttributes);
        this.addRenderable(this.expandedAnnotation);

        update();
    }

    private synchronized void update()
    {
        collapsedAnnotation.getAttributes().setVisible(collapsed);
        expandedAnnotation.getAttributes().setVisible(!collapsed);
        wwd.redrawNow();
    }

    /**
     * @return the collapsed
     */
    public boolean isCollapsed() {
        return collapsed;
    }

    /**
     * @param collapsed the collapsed to set
     */
    public void setCollapsed(boolean collapsed) {
        this.collapsed = collapsed;
        update();
    }

}

[Anthra]

It works! Thx a lot.