DisappearingLineIndicator - SyntaxEditor for Windows Forms Forum

Posted 19 years ago by byperman - Sint-Niklaas, Belgium

Hi,

I'm trying to implement a DisappearingLineIndicator, similar to the DisappearingIndicator that highlights a line (changing the backcolor) instead of making the text bold.

I'm not really sure how to do this, however. Could anyone tell me how to do this?

Thanks,
Brecht

/// <summary>
    /// Summary description for DisappearingLineIndicator.
    /// </summary>
    public class DisappearingLineIndicator : SpanIndicator
    {
        private Timer f_timer;

        private Color f_color;

        private HighlightingStyle f_style;

        public DisappearingLineIndicator(int milliSeconds, Color color) : base("DissapearingLineIndicator", 10, false, IndicatorMarks.StyleAssignment)
        {
            f_color = color;
            f_style = new HighlightingStyle("DisappearingLineIndicator", "DisappearingLineIndicator", Color.White, f_color, false, false, false);
            f_timer = new Timer(milliSeconds);
            f_timer.Elapsed += new ElapsedEventHandler(f_timer_Elapsed);
        }

        protected override void DrawMarks(Graphics g, Rectangle bounds)
        {
        }


        protected override HighlightingStyle GetHighlightingStyle()
        {
            return f_style;
        }

        protected override void OnAdded(IndicatorEventArgs e)
        {
            base.OnAdded (e);
            f_timer.Start();
        }

        private void f_timer_Elapsed(object sender, ElapsedEventArgs e)
        {
            f_timer.Stop();
            // Something should happen here...
        }
    }

Comments (4)

Posted 19 years ago by Actipro Software Support - Cleveland, OH, USA

Looks like you almost have it... in ours, we have this code related to the timer:

/// <summary>
/// Occurs when the timer expires.
/// </summary>
/// <param name="sender">Sender of the event.</param>
/// <param name="e">An <c>IndicatorEventArgs</c> that contains the event data.</param>
private void timer_Tick(object sender, EventArgs e) {
    // Disable the timer
    timer.Enabled = false;

    // Unbind the indicator if bound
    if (this.IsBound)
        this.Document.Indicators.Remove(this);
}

/// <summary>
/// Creates a timer.
/// </summary>
private void CreateTimer() {
    // Kill any existing timer
    if (timer != null) {
        try {
            timer.Enabled = false;
            timer.Tick -= new EventHandler(timer_Tick);
            timer.Dispose();
            timer = null;
        }
        catch {}
    }

    // Create the timer
    timer = new Timer();
    timer.Enabled    = false;
    timer.Interval    = milliseconds;
    timer.Tick += new EventHandler(timer_Tick);
}

/// <summary>
/// Occurs when the indicator is added to a <see cref="Document"/>.
/// </summary>
/// <param name="e">An <c>IndicatorEventArgs</c> that contains the event data.</param>
protected override void OnAdded(IndicatorEventArgs e) {
    // Call the base method
    base.OnAdded(e);

    // Enable the timer
    this.CreateTimer();
    timer.Enabled = true;
}

Actipro Software Support

Posted 19 years ago by byperman - Sint-Niklaas, Belgium

Ok, thanks.

Where did you get the Document reference in the timer_Tick-method? That seems to be the key...

Posted 19 years ago by Actipro Software Support - Cleveland, OH, USA

Oh shoot... it's an internal property. Didn't notice that. I'll make it public for the next maint release for you.

Actipro Software Support

Posted 19 years ago by byperman - Sint-Niklaas, Belgium

Great, thanks!

[Modified at 08/16/2005 07:34 AM]

The latest build of this product (v24.1.0) was released 3 months ago, which was after the last post in this thread.

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