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GanttControl.CustomDrawTask Event

Fires before a task in the chart area is displayed. Provides access to a drawing surface and allows you to draw the task manually.

Namespace: DevExpress.XtraGantt

Assembly: DevExpress.XtraGantt.v20.1.dll

Declaration

[DXCategory("Events")]
public event CustomDrawTaskEventHandler CustomDrawTask
<DXCategory("Events")>
Public Event CustomDrawTask As CustomDrawTaskEventHandler

Event Data

The CustomDrawTask event's data class is CustomDrawTaskEventArgs. The following properties provide information specific to this event:

Property Description
Appearance Provides access to the task's appearance settings.
Duration Gets the task duration.
FinishDate Gets the task finish date.
Info Provides access to view information about the task.
Node Gets the processed node.
Progress Gets the task progress.
StartDate Gets the task start date.
State Gets the object state: normal, hot tracked, pressed, disabled, or selected.

Examples

The code below shows how to indicate a critical path in the project.

HashSet<int> criticalPathIds = new HashSet<int> { 1, 2, 3, 6, 7, 8, 10, 11, 13 };
ganttControl.CustomDrawTask += (sender, e) => {
    int taskId = Convert.ToInt32(e.Node.GetValue("Id"));
    if(criticalPathIds.Contains(taskId)) {
        e.Appearance.BackColor = DXSkinColors.FillColors.Danger;
        e.Appearance.ProgressColor = DXSkinColors.FillColors.Danger;
    }
};
ganttControl.CustomDrawTaskDependency += (sender, e) => {
    int predecessorId = Convert.ToInt32(e.PredecessorNode.GetValue("Id"));
    int successorId = Convert.ToInt32(e.SuccessorNode.GetValue("Id"));
    if(criticalPathIds.Contains(predecessorId) && criticalPathIds.Contains(successorId)) {
        e.Appearance.BackColor = DXSkinColors.FillColors.Danger;
    }
};

The code below shows how to split a task's bar into two bars.

ganttControl.CustomDrawTask += (sender, e) => {
    if(e.Node.Id == 3) {
        e.Appearance.BackColor = DXSkinColors.FillColors.Danger;
        e.Appearance.ProgressColor = DXSkinColors.FillColors.Danger;
        TimeSpan offset = TimeSpan.FromHours(2);
        e.DrawShape(e.Info.StartDate + offset, e.Info.FinishDate - offset);
        e.DrawRightText();
        e.Handled = true;
    }
};
NOTE

Run the Gantt Code Examples demo to see the complete example.

See Also