DrawImageEventArgsDrawFocus Property

This property is used to get or set whether the image map should draw the default focus frame around the active image area.

Definition

Namespace: EWSoftware.ImageMaps.Windows.Forms
Assembly: EWSoftware.ImageMaps.Windows.Forms (in EWSoftware.ImageMaps.Windows.Forms.dll) Version: 2024.12.31.0
C#View SourceRequest Example
public bool DrawFocus { get; set; }

Property Value

Boolean

If true, the image map will draw the default focus frame around the active image area. If false, it will assume that the owner draw event has done so and will not draw it.

For the image map DrawImage event, it defaults to true so that the image map draws the focus frame on the active area. It can be set to false to cancel this behavior.

For the image area DrawImage event, it defaults to false and assumes that the owner draw event will draw some sort of focus indicator for the image area. If this is not the case, you can set it to true to have the image map draw the default focus frame around the active image area.

Example

This is an example of an owner drawn image area event handler. For some other examples, see the demo application. As shown, the image area event properties are not accessible in the designer so you must write code to connect the event handlers. For example, add the code in the form's constructor after the call to InitializeComponent.
C#
public ImageMapEventsForm()
{
    InitializeComponent();

    // Hook up the event handlers.  Since they are not accessible in the
    // designer, we must do it manually.
    ImageAreaBase a = (ImageAreaBase)imMap.Areas[4];
    a.DrawImage += Button_DrawImage;

    a = (ImageAreaBase)imMap.Areas[5];
    a.DrawImage += Button_DrawImage;

    a = (ImageAreaBase)imMap.Areas[6];
    a.DrawImage += Button_DrawImage;

    .
    .
    .
}


/// <summary>
/// Draw the "button" image areas
/// </summary>
/// <param name="sender">The sender of the event (the image area)</param>
/// <param name="e">The event arguments</param>
private void Button_DrawImage(object sender, DrawImageEventArgs e)
{
    ImageAttributes ia;
    Graphics g = e.Graphics;

    // All are ellipse image areas
    ImageAreaEllipse a = (ImageAreaEllipse)sender;
    Rectangle r = a.Ellipse;

    // Offset the area rectangle by the draw event offset
    r.Offset(e.ImageOffset.X, e.ImageOffset.Y);

    if(!a.Enabled)
        ia = iaDisabled;
    else
        ia = iaNormal;

    using TextureBrush tb = new(imgFiller, new Rectangle(0, 0, imgFiller.Width, imgFiller.Height), ia);

    tb.WrapMode = WrapMode.Tile;

    // Translate the brush coordinates to account for the offset
    using Matrix m = new();

    m.Translate(r.X, r.Y);
    tb.Transform = m;

    // If the area is focused or hot lighted, give it a glow effect
    if(e.DrawState == DrawState.Focus || e.DrawState == DrawState.HotLight)
    {
        using GraphicsPath pth = new();

        pth.AddEllipse(r);

        using PathGradientBrush pgb = new(pth);
        pgb.CenterColor = Color.LightSteelBlue;

        if(e.DrawState == DrawState.Focus)
            pgb.SurroundColors = [Color.Yellow];
        else
            pgb.SurroundColors = [Color.Blue];

        pgb.FocusScales = new PointF(0.8f, 0.8f);

        g.FillEllipse(pgb, r);
    }

    // Draw the filler
    g.FillEllipse(tb, r);
    g.DrawString((string)a.Tag, buttonFont, Brushes.Black, r, sfFormat);
}

See Also