Here is a question submitted by an ADN developer that could be turned into an interesting post:
I created a texbox through the Ribbon runtime API, I would now want to get notified whenever the textbox is getting or losing focus, so I can perform some custom actions, like highlighting corresponding entities for example.
Solution
The RibbonTextBox derives from the "System.Windows.Controls.TextBox" object, so here is a way to retrieve keyboard focus notifications for it:
[CommandMethod("RibbonTextBox")]
public void RibbonTextBox()
{
Autodesk.Windows.RibbonControl ribbonControl =
Autodesk.Windows.ComponentManager.Ribbon;
RibbonTab Tab = new RibbonTab();
Tab.Title = "Test Ribbon";
Tab.Id = "TESTRIBBON_TAB_ID";
ribbonControl.Tabs.Add(Tab);
Autodesk.Windows.RibbonPanelSource srcPanel =
new RibbonPanelSource();
srcPanel.Title = "Panel1";
RibbonPanel Panel = new RibbonPanel();
Panel.Source = srcPanel;
Tab.Panels.Add(Panel);
MyTextBox textbox = new MyTextBox();
textbox.Width = 100;
textbox.IsEmptyTextValid = false;
textbox.AcceptTextOnLostFocus = true;
textbox.InvokesCommand = true;
textbox.CommandHandler = new TextboxCommandHandler();
srcPanel.Items.Add(textbox);
Tab.IsActive = true;
}
public class TextboxCommandHandler :
System.Windows.Input.ICommand
{
public bool CanExecute(object
parameter)
{
return true;
}
public event EventHandler CanExecuteChanged;
public void Execute(object parameter)
{
RibbonTextBox textbox = parameter as RibbonTextBox;
if (textbox != null)
{
Document doc = Autodesk.AutoCAD.ApplicationServices.
Application.DocumentManager.MdiActiveDocument;
doc.Editor.WriteMessage("\nRibbon Textbox: "
+ textbox.TextValue + "\n");
}
}
}
public class MyTextBox : RibbonTextBox
{
public MyTextBox()
{
EventManager.RegisterClassHandler(
typeof(System.Windows.Controls.TextBox),
System.Windows.Controls.TextBox.GotKeyboardFocusEvent,
new RoutedEventHandler(OnGotFocus));
EventManager.RegisterClassHandler(
typeof(System.Windows.Controls.TextBox),
System.Windows.Controls.TextBox.LostKeyboardFocusEvent,
new RoutedEventHandler(OnLostFocus));
}
void OnGotFocus(object sender, RoutedEventArgs e)
{
if (e.Source != null)
{
System.Windows.Controls.TextBox element =
e.Source as System.Windows.Controls.TextBox;
if (element != null)
{
MyTextBox ribbonItem =
element.DataContext as MyTextBox;
if (ribbonItem != null)
{
Document doc = Autodesk.AutoCAD.
ApplicationServices.Application.
DocumentManager.MdiActiveDocument;
doc.Editor.WriteMessage(
"\nTextbox got focus :)\n");
}
}
}
}
void OnLostFocus(object sender, RoutedEventArgs e)
{
if (e.Source != null)
{
System.Windows.Controls.TextBox element =
e.Source as System.Windows.Controls.TextBox;
if (element != null)
 
; {
MyTextBox ribbonItem =
element.DataContext as MyTextBox;
if (ribbonItem != null)
{
Document doc = Autodesk.AutoCAD.
ApplicationServices.Application.
DocumentManager.MdiActiveDocument;
doc.Editor.WriteMessage(
"\nTextbox lost focus :(\n");
}
}
}
}
}
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