GanttControl.CustomDrawTaskDependency Event
Fires before a task dependency line 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.v24.2.dll
NuGet Package: DevExpress.Win.Gantt
#Declaration
[DXCategory("Events")]
public event CustomDrawTaskDependencyEventHandler CustomDrawTaskDependency
#Event Data
The CustomDrawTaskDependency event's data class is CustomDrawTaskDependencyEventArgs. The following properties provide information specific to this event:
Property | Description |
---|---|
Appearance | Provides access to appearance settings that specify the dependency line background color. |
Cache |
Provides access to the drawing surface and a cache of brushes, pens, fonts, and other graphics.
Inherited from Custom |
Handled |
Gets or sets whether the event is handled and allows you to prevent the control from drawing the visual element in its default appearance.
Inherited from Custom |
Lines |
Provides access to the collection of Rectangle |
Predecessor |
Gets the predecessor node. |
State | Gets the object state: normal, hot tracked, pressed, disabled, or selected. |
Successor |
Gets the successor node. |
The event data class exposes the following methods:
Method | Description |
---|---|
Default |
Draws the task dependency line. |
#Example
The code below shows how to highlight specific tasks and dependencies.
HashSet<int> tasks = 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(tasks.Contains(taskId)) {
e.Appearance.BackColor = DXSkinColors.FillColors.Warning;
e.Appearance.ProgressColor = DXSkinColors.FillColors.Warning;
}
};
ganttControl.CustomDrawTaskDependency += (sender, e) => {
int predecessorId = Convert.ToInt32(e.PredecessorNode.GetValue("Id"));
int successorId = Convert.ToInt32(e.SuccessorNode.GetValue("Id"));
if(tasks.Contains(predecessorId) && tasks.Contains(successorId)) {
e.Appearance.BackColor = DXSkinColors.FillColors.Warning;
}
};