DesignerGlyph.CanBeActivated 屬性

定義

命名空間:

System.Workflow.ComponentModel.Design

組件:

System.Workflow.ComponentModel.dll

取得值，指出 DesignerGlyph 是否可以在與其相關的 ActivityDesigner 上取得焦點。

C#

public virtual bool CanBeActivated { get; }

屬性值

Boolean

如果可以啟動設計工具圖像，則為 true；否則為 false。 預設為 false。

範例

下列程式碼範例將示範 CanBeActivated 屬性的實作。 這個範例來自＜追蹤設定檔設計工具 SDK＞範例。 如需詳細資訊，請參閱 追蹤配置文件設計工具範例。

C#

/// <summary>
/// This glyph shows that the activity's track point is not correctly configured
/// </summary>
internal sealed class ErrorActivityGlyph : DesignerGlyph
{
    static Bitmap image = Resources.error;
    string errorMessage;

    internal ErrorActivityGlyph(string errorMessage)
    {
        this.errorMessage = errorMessage;
    }

    public override bool CanBeActivated
    {
        get
        {
            return true;
        }
    }

    /// <summary>
    /// Display an error message when this glyph is clicked
    /// </summary>
    /// <param name="designer"></param>
    protected override void OnActivate(ActivityDesigner designer)
    {
        MessageBox.Show(errorMessage);
    }

    public override Rectangle GetBounds(ActivityDesigner designer, bool activated)
    {
        Rectangle imageBounds = new Rectangle();
        if (image != null)
        {
            imageBounds.Size = image.Size;
            imageBounds.Location = new Point(designer.Bounds.Right - imageBounds.Size.Width / 4, designer.Bounds.Top - imageBounds.Size.Height / 2);
        }
        return imageBounds;
    }

    protected override void OnPaint(Graphics graphics, bool activated, AmbientTheme ambientTheme, ActivityDesigner designer)
    {
        image.MakeTransparent(Color.FromArgb(255, 255, 255));
        if (image != null)
        {
            graphics.DrawImage(image, GetBounds(designer, activated), new Rectangle(Point.Empty, image.Size), GraphicsUnit.Pixel);
        }
    }
}

適用於