This topic describes some of the available events triggered by common user interactions in the xamGantt™ control.
The following topics are prerequisites to understanding this topic:
This topic contains the following sections:
The following table lists some of the events invoked while manipulating the xamGantt control user interface.
These events have the suffix “ing” or “ed” appended to them, reflecting the order in which they occur.
The (-ing) events are cancelable and are invoked before the (-ed) events.
The code snippet demonstrates how to disable milestones dragging.
The XamGantt TaskBarDragging event is handled in order to check if a task is a milestone and if it is – cancel its dragging.
In XAML:
<ig:ListBackedProject x:Name="dataProvider" TaskItemsSource="{Binding Tasks}">
<ig:ListBackedProject.TaskPropertyMappings>
<!-- Add Project Task Property Mappings Here -->
</ig:ListBackedProject.TaskPropertyMappings>
</ig:ListBackedProject>
<ig:XamGantt x:Name="gantt"
Project="{Binding ElementName=dataProvider}"
TaskBarDragging="gantt_TaskBarDragging"/>In C#:
private void gantt_TaskBarDragging(object sender, GanttTaskBarDraggingEventArgs e)
{
// If a task is a milestone, prevent dragging
if (e.Task.IsMilestone)
{
e.Cancel = true;
}
}In Visual Basic:
Private Sub gantt_TaskBarDragging(sender As Object, e As GanttTaskBarDraggingEventArgs)
' If a task is a milestone, prevent dragging
If e.Task.IsMilestone Then
e.Cancel = True
End If
End SubThe following table lists some of Project class events that are invoked while manipulating the project and project tasks.
These events have the suffix “ing” or “ed” appended to them, reflecting the order in which they occur.
The (-ing) events are cancelable and are invoked before the (-ed) events. Both events handlers expose information about the ProjectTask associated with the event.
The code snippet demonstrates how deleting a task may be confirmed or canceled depending on the user actions.
After a right mouse click on a task in the xamGantt grid area, a context menu appears with the Delete option. If a user chooses to delete the selected task, a message box displays with two button options – OK and Cancel. If a user clicks the Cancel button, the deleting event is omitted. If the user clicks the OK button, the task is deleted.
In XAML:
<ig:ListBackedProject x:Name="dataProvider"
TaskItemsSource="{Binding Tasks}"
TaskDeleting="dataProvider_TaskDeleting">
<ig:ListBackedProject.TaskPropertyMappings>
<!-- Add Project Task Property Mappings Here -->
</ig:ListBackedProject.TaskPropertyMappings>
</ig:ListBackedProject>
<ig:XamGantt x:Name="gantt"
Project="{Binding ElementName=dataProvider}" />In C#:
using Infragistics.Controls.Schedules;
private void dataProvider_TaskDeleting(object sender, ProjectTaskDeletingEventArgs e)
{
string msg = String.Format("Are you sure you want to delete {0} task?", e.Task.TaskName);
MessageBoxResult result = MessageBox.Show(msg, "Confirmation", MessageBoxButton.OKCancel);
if (result == MessageBoxResult.Cancel)
{
// Cancel task deletion
e.Cancel = true;
}
}In Visual Basic:
Imports Infragistics.Controls.Schedules
Private Sub dataProvider_TaskDeleting(sender As System.Object, e As ProjectTaskDeletingEventArgs)
Dim msg As String = [String].Format("Are you sure you want to delete {0} task?", e.Task.TaskName)
Dim result As MessageBoxResult = MessageBox.Show(msg, "Confirmation", MessageBoxButton.OKCancel)
If result = MessageBoxResult.Cancel Then
' Cancel task deletion
e.Cancel = True
End If
End SubThe following topics provide additional information related to this topic.