windowsforms-devexpress-dot-xtragantt-dot-ganttcontrol-67954634.md
Fires before a Gantt bar in the chart area is printed. Provides access to the drawing surface and allows you to draw the Gantt bar in a custom way.
Namespace : DevExpress.XtraGantt
Assembly : DevExpress.XtraGantt.v25.2.dll
NuGet Package : DevExpress.Win.Gantt
[DXCategory("Events")]
public event CustomPrintTaskEventHandler CustomPrintTask
<DXCategory("Events")>
Public Event CustomPrintTask As CustomPrintTaskEventHandler
The CustomPrintTask event's data class is CustomPrintTaskEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| Appearance | Provides access to the task’s appearance settings. Inherited from CustomDrawTaskEventArgs. |
| Cache | Provides access to the drawing surface and a cache of brushes, pens, fonts, and other graphics. Inherited from CustomDrawEventArgs. |
| Duration | Gets the task duration. Inherited from CustomDrawTaskEventArgs. |
| FinishDate | Gets the task finish date. Inherited from CustomDrawTaskEventArgs. |
| 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 CustomDrawEventArgs. |
| Info | Provides access to view information about the task. Inherited from CustomDrawTaskEventArgs. |
| Node | Gets the processed node. Inherited from CustomDrawTaskEventArgs. |
| Progress | Gets the task progress. Inherited from CustomDrawTaskEventArgs. |
| StartDate | Gets the task start date. Inherited from CustomDrawTaskEventArgs. |
| State | Gets the object state: normal, hot tracked, pressed, disabled, or selected. Inherited from CustomDrawTaskEventArgs. |
The event data class exposes the following methods:
| Method | Description |
|---|---|
| DefaultDraw() | Draws the visual element in its default appearance. Inherited from CustomDrawEventArgs. |
| DrawBaseline() | Draws the baseline. Inherited from CustomDrawTaskEventArgs. |
| DrawBaseline(RectangleF) | Draws the baseline in the specified bounds. Inherited from CustomDrawTaskEventArgs. |
| DrawHtml(HtmlTemplate, DxHtmlPainterContext, Action<DxHtmlPainterArgs>) | Paints the required HTML template inside an element that raised this event. The context parameter allows you to assign an object that transfers mouse events to template elements. Inherited from CustomDrawTaskEventArgs. |
| DrawHtml(HtmlTemplate, Action<DxHtmlPainterArgs>) | Paints the required HTML template inside an element that raised this event. Inherited from CustomDrawTaskEventArgs. |
| DrawInsideText() | Draws the text inside the bar. Inherited from CustomDrawTaskEventArgs. |
| DrawLeftLinkPoint() | Draws a dependency connection point at the left side of the task. Inherited from CustomDrawTaskEventArgs. |
| DrawLeftText() | Draws the text to the left of the bar. Inherited from CustomDrawTaskEventArgs. |
| DrawLeftText(RectangleF) | Draws the text to the left of the bar within the specified bounds. Inherited from CustomDrawTaskEventArgs. |
| DrawRightLinkPoint() | Draws a dependency connection point at the right side of the task. Inherited from CustomDrawTaskEventArgs. |
| DrawRightText() | Draws the text to the right of the bar. Inherited from CustomDrawTaskEventArgs. |
| DrawRightText(RectangleF) | Draws the text to the left of the bar within the specified bounds. Inherited from CustomDrawTaskEventArgs. |
| DrawShape() | Draws the task shape: bar, summary bar, or milestone. Inherited from CustomDrawTaskEventArgs. |
| DrawShape(DateTime, DateTime) | Draws the task shape (bar, summary bar, or milestone) with an interruption. Inherited from CustomDrawTaskEventArgs. |
| DrawShape(RectangleF, Single) | Draws the task shape: bar, summary bar, or milestone. Inherited from CustomDrawTaskEventArgs. |
| DrawSplit(RectangleF) | Draws a task splitter. Inherited from CustomDrawTaskEventArgs. |
| GetPosition(DateTime) | Returns the horizontal position of the specified date on the timescale. Inherited from CustomDrawTaskEventArgs. |
Before a project is printed or exported, the control raises the following events that allow you to draw visual elements in a custom way:
CustomPrintTask—allows you to draw a Gantt bar. This event is equivalent to the CustomDrawTask event, which allows you to customize a Gantt bar when it is displayed onscreen.
CustomPrintTaskDependency—allows you to draw a dependency line. This event is equivalent to the CustomDrawTaskDependency event, which allows you to customize a dependency line when it is displayed onscreen.
CustomPrintTimescaleColumn—allows you to draw a timescale column (the header, which displays the date, and the chart area). This event is equivalent to the CustomDrawTimescaleColumn event, which allows you to customize a timescale column when it is displayed onscreen.
The code below shows how to highlight specific tasks and dependencies when the project is printed.
Run Demo: Highlight Tasks and Dependencies
HashSet<int> tasks = new HashSet<int> { 1, 2, 3, 6, 7, 8, 10, 11, 13 };
ganttControl.CustomPrintTask += (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.CustomPrintTaskDependency += (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;
}
};
Dim tasks As New HashSet(Of Integer)() From {1, 2, 3, 6, 7, 8, 10, 11, 13}
AddHandler ganttControl.CustomPrintTask, Sub(sender, e)
Dim taskId As Integer = Convert.ToInt32(e.Node.GetValue("Id"))
If tasks.Contains(taskId) Then
e.Appearance.BackColor = DXSkinColors.FillColors.Warning
e.Appearance.ProgressColor = DXSkinColors.FillColors.Warning
End If
End Sub
AddHandler ganttControl.CustomPrintTaskDependency, Sub(sender, e)
Dim predecessorId As Integer = Convert.ToInt32(e.PredecessorNode.GetValue("Id"))
Dim successorId As Integer = Convert.ToInt32(e.SuccessorNode.GetValue("Id"))
If tasks.Contains(predecessorId) AndAlso tasks.Contains(successorId) Then
e.Appearance.BackColor = DXSkinColors.FillColors.Warning
End If
End Sub
The following code snippet (auto-collected from DevExpress Examples) contains a reference to the CustomPrintTask event.
Note
The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.
gantt.CustomDrawTask += Gantt_CustomDrawTask;
gantt.CustomPrintTask += Gantt_CustomPrintTask;
gantt.CustomTaskDisplayText += Gantt_CustomTaskDisplayText;
AddHandler gantt.CustomDrawTask, AddressOf Gantt_CustomDrawTask
AddHandler gantt.CustomPrintTask, AddressOf Gantt_CustomPrintTask
AddHandler gantt.CustomTaskDisplayText, AddressOf Gantt_CustomTaskDisplayText
See Also