Events in Windows Forms TabControl (TabControlAdv)

4 Feb 202524 minutes to read

AfterEdit event

This AfterEdit event occurs after text editing is completed. It is fired even if no changes are made.

Event data

The Edit Event Handler receives an argument of type EditEventArgs containing data related to this event. The EditEventArgs property provides information specific to this event.

private void tabControlAdv1_AfterEdit(object sender, Syncfusion.Windows.Forms.Tools.EditEventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write(" AfterEdit event is triggered");

//Gets the edited text in the output window.

Console.Write("Edit text :" + e.EditText.ToString());

}
Private Sub tabControlAdv1_AfterEditEvent(ByVal sender As Object, ByVal e As Syncfusion.Windows.Forms.Tools.EditEventArgs)

'Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write(" AfterEdit event is triggered")

'Gets the edited text in the output window.

Console.Write("Edit text :" + e.EditText.ToString())

End Sub

BeforeEdit event

This BeforeEdit event occurs when the text enters into Edit mode.

Event data

This Event Handler receives an argument of type EditEventArgs containing data related to this event. The EditEventArgs property provides information specific to this event.

Member Description
EditText Gets the edited text. 
private void tabControlAdv1_BeforeEditEvent(object sender, Syncfusion.Windows.Forms.Tools.EditEventArgs e)

{

//Below line will be displayed in the output window, when this event is fired.

Console.Write("BeforeEdit event is triggered");

//Gets the edited text in the output window.

Console.Write("Edit text :" + e.EditText.ToString());

}
Private Sub tabControlAdv1_BeforeEditEvent(ByVal sender As Object, ByVal e As Syncfusion.Windows.Forms.Tools.EditEventArgs)

'Below line will be displayed in the output window, when this event is fired.

Console.Write("BeforeEdit event is triggered")

'Gets the edited text in the output window.

Console.Write("Edit text :" + e.EditText.ToString())

End Sub

BackgroundImageChanged event

This BackgroundImageChanged event is fired when the value of the BackgroundImage property is changed in the TabControlAdv.

private void tabControlAdv1_BackgroundImageChanged(object sender, System.Windows.Forms.EventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Background Image event is raised");

}
Private Sub tabControlAdv1_BackgroundImageChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.EventArgs)

'Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Background Image event is raised")

End Sub

BackgroundImageLayoutChanged event

This BackgroundImageLayoutChanged event is fired when the value of the BackgroundImageLayout property is changed in the TabControlAdv.

private void tabControlAdv1_BackgroundImageLayoutChanged(object sender, System.Windows.Forms.EventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("BackgroundImageLayoutChanged event is raised");

}
Private Sub tabControlAdv1_BackgroundImageLayout(ByVal sender As Object, ByVal e As System.Windows.Forms.EventArgs)

'Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("BackgroundImageLayoutChanged event is raised")

End Sub

BackColorChanged event

This BackColorChanged event is fired when the value of the BackColor property is changed in the TabControlAdv.

// Set the new back color.

this.tabControlAdv1.BackColor = System.Drawing.Color.Aqua;

// Set the active tab color for the TabControlAdv to highlight the activated tab in the control.

this.tabControlAdv1.ActiveTabColor = System.Drawing.Color.Bisque;



// Handle the BackColorChanged event.

this.tabControlAdv1.BackColorChanged+=new EventHandler(tabControlAdv1_BackColorChanged);

private void tabControlAdv1_BackColorChanged(object sender, EventArgs e)

{

Console.Write("BackColorChanged event is raised");

}
' Set the new back color. 

Me.tabControlAdv1.BackColor = System.Drawing.Color.Aqua 

' Set the active tab color for the TabControlAdv to highlight the activated tab in the control. 

Me.tabControlAdv1.ActiveTabColor = System.Drawing.Color.Bisque 



' Handle the BackColorChanged event. 

AddHandler Me.tabControlAdv1.BackColorChanged, AddressOf tabControlAdv1_BackColorChanged 

Private Sub tabControlAdv1_BackColorChanged(ByVal sender As Object, ByVal e As EventArgs)

   Console.Write("BackColorChanged event is raised")

End Sub

ControlAdded event

This ControlAdded event occurs when a new control is added to the TabControlAdv.

Event data

This Event Handler receives an argument of type ControlEventArgs containing data related to this event. The following ControlEventArgs property provides information specific to this event.

Member Description
Control Gets the control object used by this event. 
private void tabControlAdv1_ControlAdded(object sender, System.Windows.Forms.ControlEventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Control Added event is raised");

//Gets the control object used by this event.

Console.Write("Control Name :" + e.Control.ToString());

}
Private Sub tabControlAdv1_ControlAdded(ByVal sender As Object, ByVal e As System.Windows.Forms.ControlEventArgs)

'Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Control Added event is raised")

'Gets the control object used by this event.

Console.Write("Control Name :" + e.Control.ToString())

End Sub

ControlRemoved event

This ControlRemoved event occurs when a new control is removed from this TabControlAdv.

Event data

This Event Handler receives an argument of type ControlEventArgs containing data related to this event. The following ControlEventArgs property provides information specific to this event.

Member Description
Control Gets the control object used by this event.

NOTE

The TabControlAdv.RemoveAll method removes all the TabPages and additional controls from the TabControlAdv.

private void tabControlAdv1_ControlRemoved(object sender, System.Windows.Forms.ControlEventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Control Removed event is raised");

//Gets the control object used by this event.

Console.Write("Control Name :" + e.Control.ToString());

}
Private Sub tabControlAdv1_ControlRemoved(ByVal sender As Object, ByVal e As System.Windows.Forms.ControlEventArgs)

'Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Control Removed event is raised")

'Gets the control object used by this event.

Console.Write("Control Name :" + e.Control.ToString())

End Sub

DrawItem event

This DrawItem event is triggered whenever a particular item or area needs to be painted. Below is an example which draws the background and the interior by handling this event.

Event data

This Event Handler receives an argument of type DrawTabEventArgs containing data related to this event. The DrawTabEventArgs properties provide information specific to this event.

NOTE

The TabControlAdv.OnDrawItem method raises the DrawItem event.

private void tabControlAdv1_DrawItem(object sender, Syncfusion.Windows.Forms.Tools.DrawTabEventArgs drawItemInfo)

{

drawItemInfo.DrawBackground();

drawItemInfo.DrawInterior();

switch(this.comboBox1.SelectedIndex)

{

case 0:this.Tab_DrawItemYahooMessengerLike(sender, drawItemInfo);

break;

case 1: this.Tab_DrawItemMSNMessengerLike(sender, drawItemInfo);

break;

}

}
Private Sub tabControlExt1_DrawItem(ByVal sender As System.Object, ByVal drawItemInfo As Syncfusion.Windows.Forms.Tools.DrawTabEventArgs) Handles tabControlExt1.DrawItem

drawItemInfo.DrawBackground()

drawItemInfo.DrawInterior()

Select Case Me.comboBox1.SelectedIndex

Case 0

Me.Tab_DrawItemYahooMessengerLike(sender, drawItemInfo)

'End Section

Case 1

Me.Tab_DrawItemMSNMessengerLike(sender, drawItemInfo)

'End Section

End Select

End Sub

ForeColorChanged event

This ForeColorChanged event is raised when the value of the ForeColor property is changed on the TabControlAdv.

private void tabControlAdv1_ForeColorChanged(object sender, System.Windows.Forms.EventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("ForeColor Changed event is raised");

}
Private Sub tabControlAdv1_ForeColorChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.EventArgs)

'Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("ForeColor Changed event is raised")

End Sub

LabelEditChanged event

This LabelEditChanged event is triggered when the LabelEdit property is changed in the TabControlAdv.

// Set the LabelEdit property.

this.tabControlAdv1.LabelEdit = true;

// Handle the LabelEditChanged event.

this.tabControlAdv1.LabelEditChanged+=new EventHandler(tabControlAdv1_LabelEditChanged);

private void tabControlAdv1_LabelEditChanged(object sender, EventArgs e)

{

// Below line will be displayed in the output window at runtime, when this event is fired.

Console.Write("LabelEditChanged event is raised");

}
' Set the LabelEdit property. 

Me.tabControlAdv1.LabelEdit = True 

' Handle the LabelEditChanged event. 

AddHandler Me.tabControlAdv1.LabelEditChanged, AddressOf tabControlAdv1_LabelEditChanged 



Private Sub tabControlAdv1_LabelEditChanged(ByVal sender As Object, ByVal e As EventArgs)

' Below line will be displayed in the output window at runtime, when this event is fired. 

Console.Write("LabelEditChanged event is raised")

End Sub

LabelEditTextChanged event

This LabelEditTextChanged event is triggered when the original text of the Tab is changed.

// Set the LabelEdit property to True, to enable editing of the TabPage's captions.

this.tabControlAdv1.LabelEdit = true;

// Set the text for the TabPage.

this.tabPageAdv1.Text = "Tab1";

// Set the font of the text for the TabPage.

this.tabControlAdv1.Font = new System.Drawing.Font("Comic Sans MS", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));



// Handle the LabelEditTextChanged event.

this.tabControlAdv1.LabelEditTextChanged+=new EventHandler(tabControlAdv1_LabelEditTextChanged);



private void tabControlAdv1_LabelEditTextChanged(object sender, EventArgs e)

{

// Below line will be displayed in the output window at runtime, when text is edited.

Console.Write("LabelEditTextChanged event is raised");

}
' Set the LabelEdit property to True, to enable editing of the TabPages' captions. 

Me.tabControlAdv1.LabelEdit = True 

' Set the text for the TabPage. 

Me.tabPageAdv1.Text = "Tab1" 

' Set the font of the text for the TabPage. 

Me.tabControlAdv1.Font = New System.Drawing.Font("Comic Sans MS", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CByte((0))) 



' Handle the LabelEditTextChanged event. 

AddHandler Me.tabControlAdv1.LabelEditTextChanged, AddressOf tabControlAdv1_LabelEditTextChanged 



Private Sub tabControlAdv1_LabelEditTextChanged(ByVal sender As Object, ByVal e As EventArgs)

   'Below line will be displayed in the output window at runtime, when text is edited. 

   Console.Write("LabelEditTextChanged event is raised")

End Sub

PaddingChanged event

This PaddingChanged event occurs when the Padding property is changed in the TabControlAdv.

private void tabControlAdv1_PaddingChanged(object sender, System.Windows.Forms.EventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Padding Changed event is raised");

}
Private Sub tabControlAdv1_PaddingChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.EventArgs)

'Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Padding Changed event is raised")

End Sub

Paint event

This Paint event occurs when a TabControlAdv needs re-painting.

Event data

This Event Handler receives an argument of type PaintEventArgs containing data related to this event. The PaintEventArgs property provides information specific to this event.

private void tabControlAdv1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)

{

if(this.ClientRectangle.Width > 0 && this.ClientRectangle.Height > 0)

{

LinearGradientBrush linearBrush = new LinearGradientBrush(this.ClientRectangle, SystemColors.Control, SystemColors.ControlDark, LinearGradientMode.Horizontal);

e.Graphics.FillRectangle(linearBrush, this.ClientRectangle);

}

}
Private Sub tabControlAdv1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs)

If Me.ClientRectangle.Width > 0 AndAlso Me.ClientRectangle.Height > 0 Then

Dim linearBrush As LinearGradientBrush = New LinearGradientBrush(Me.ClientRectangle, SystemColors.Control, SystemColors.ControlDark, LinearGradientMode.Horizontal)

e.Graphics.FillRectangle(linearBrush, Me.ClientRectangle)

End If

End Sub

PreviewKeyDown event

This PreviewKeyDown event occurs before the KeyDown event when a key is pressed, while focus is on the TabControlAdv.

Event data

This Event Handler receives an argument of type PreviewKeyDownEventArgs containing data related to this event. The following PreviewKeyDownEventArgs properties provide information specific to this event.

private void tabControlAdv1_PreviewKeyDown(object sender, System.Windows.Forms.PreviewKeyDownEventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("PreviewKeyDown event is raised");

//The below code prints the KeyCode, KeyValue, KeyData and Modifiers in the output window at run-time.

Console.Write("Key code :" + e.KeyCode.ToString() + "\n" + "Key Value :" + e.KeyValue.ToString() + "\n" + "Key Data:" + e.KeyData.ToString() + "\n" + "Modifiers:" + e.Modifiers.ToString());

}
Private Sub tabControlAdv1_PreviewKeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.PreviewKeyDownEventArgs)

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("PreviewKeyDown event is raised")

'The below code prints the KeyCode, KeyValue, KeyData and Modifiers in the output window at run-time.

Console.Write("Key code :" + e.KeyCode.ToString() + "\n" + "Key Value :" + e.KeyValue.ToString() + "\n" + "Key Data:" + e.KeyData.ToString() + "\n" + "Modifiers:" + e.Modifiers.ToString())

End Sub

RegionChanged event

This RegionChanged event is raised when the value of the Region property is changed in the TabControlAdv.

private void tabControlAdv1_RegionChanged(object sender, System.Windows.Forms.EventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Region Changed event is raised");

}
Private Sub tabControlAdv1_RegionChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.EventArgs)

'Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("Region Changed event is raised")

End Sub

TabPrimitiveClick event

This TabPrimitiveClick event occurs before the NavigationButton click.

Event data

This Event Handler receives an argument of type TabPrimitiveClickEventArgs containing data related to this event. The following TabPrimitiveClickEventArgs properties provide information specific to this event.

private void tabControlAdv4_TabPrimitiveClick(object sender, Syncfusion.Windows.Forms.Tools.TabPrimitiveClickEventArgs e)

{

if(e.TabPrimitive.Name == "CustomAbout")

{

DemoCommon.AboutForm ab=new DemoCommon.AboutForm( AppDomain.CurrentDomain.GetAssemblies());

ab.ShowDialog();

}

//This event can be canceled using the code given below.

e.Cancel = true;

//This code displays the primitive that gets clicked during this event.

Console.Write("TabPrimitiveClick:" + e.TabPrimitive.ToString());

}
Private Sub tabControlAdv4_TabPrimitiveClick(ByVal sender As Object, ByVal e As Syncfusion.Windows.Forms.Tools.TabPrimitiveClickEventArgs)

If e.TabPrimitive.Name = "CustomAbout" Then

Dim ab As DemoCommon.AboutForm = New DemoCommon.AboutForm(AppDomain.CurrentDomain.GetAssemblies)

ab.ShowDialog()

End If

'this event can be canceled using the code given below.

e.Cancel = True

'This code displays the primitive that gets clicked during this event.

Console.Write("TabPrimitiveClick:" + e.TabPrimitive.ToString())

End Sub

SelectedIndexChanging event

SelectedIndexChanging event occurs while changing the SelectedIndex or SelectedTab of the TabControlAdv. Tab Selection can be restricted by setting args.Cancel to true.

private void TabControlAdv1_SelectedIndexChanging(object sender, SelectedIndexChangingEventArgs args)

{

if(this.tabControlAdv1.TabPages[args.NewSelectedIndex].Text == "TabPageAdv 2")

{

args.Cancel = true;

}

}
Private Sub TabControlAdv1_SelectedIndexChanging(ByVal sender As Object, ByVal args As SelectedIndexChangingEventArgs)

If Me.tabControlAdv1.TabPages(args.NewSelectedIndex).Text = "TabPageAdv 2" Then

args.Cancel = True

End If

End Sub

SelectedIndexChanged event

SelectedIndexChanged event occurs when the SelectedIndex or SelectedTab of the TabControlAdv is changed.

private void TabControlAdv1_SelectedIndexChanged(object sender, EventArgs e)

{

foreach (TabPageAdv item in this.tabControlAdv1.TabPages)

{

if (this.tabControlAdv1.SelectedTab == item)

{ 

Console.WriteLine("Selected Tab:" + item.Text);                    

}               

}

}
Private Sub TabControlAdv1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)

For Each item As TabPageAdv In Me.tabControlAdv1.TabPages

If Me.tabControlAdv1.SelectedTab = item Then

Console.WriteLine("Selected Tab:" & item.Text)

End If

Next

End Sub

TabsOrderChanged event

This TabsOrderChanged event occurs when the order of the tabs are changed in the TabControlAdv.

// Set the UserMoveTabs property to True, to drag and drop tabs during runtime.

this.tabControlAdv1.UserMoveTabs = true;



// Handle the TabsOrderChanged event.

this.tabControlAdv1.TabsOrderChanged+=new EventHandler(tabControlAdv1_TabsOrderChanged);

}



private void tabControlAdv1_TabsOrderChanged(object sender, EventArgs e)

{

// Below line will be displayed in the output window at run-time, when a tab is dragged and dropped at another location.

Console.Write("TabsOrderChanged event is raised");

}
' Set the UserMoveTabs property to True, to drag and drop tabs during runtime. 

Me.tabControlAdv1.UserMoveTabs = True 



' Handle the TabsOrderChanged event. 

AddHandler Me.tabControlAdv1.TabsOrderChanged, AddressOf tabControlAdv1_TabsOrderChanged 

Private Sub tabControlAdv1_TabsOrderChanged(ByVal sender As Object, ByVal e As EventArgs)

   ' Below line will be displayed in the output window at run-time, when a tab is dragged and dropped at another location. 

   Console.Write("TabsOrderChanged event is raised")

End Sub

NOTE

The TabControlAdv.OnTabsOrderChanged method raises the OnTabsOrderChanged event.

TextChanged event

This TextChanged event occurs when the value of the Text property is changed.

private void tabControlAdv1_TextChanged(object sender, System.Windows.Forms.EventArgs e)

{

//Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("TextChanged event is raised");

}
Private Sub tabControlAdv1_TextChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.EventArgs)

'Below line will be displayed in the output window at run-time, when this event is fired.

Console.Write("TextChanged event is raised")

End Sub

The TabPageAdv.Closed event is raised when a TapPage is closed using close button.

private void tabPageAdv1_Closed(object sender, EventArgs e)

{

   this.tabPageAdv5 = new Syncfusion.Windows.Forms.Tools.TabPageAdv();

   this.tabPageAdv5.Text = "New Tab";

   this.tabControlAdv1.TabPages.Add(this.tabPageAdv5);

}
Private Sub tabPageAdv1_Closed(ByVal sender As Object, ByVal e As EventArgs)

Me.tabPageAdv5 = New Syncfusion.Windows.Forms.Tools.TabPageAdv() 

Me.tabPageAdv5.Text = "New Tab" 

Me.tabControlAdv1.TabPages.Add(Me.tabPageAdv5)

End Sub

Closing event

The Closing event is raised when a Tab page is closed.

private void tabPageAdv1_Closing(object sender, TabPageAdvClosingEventArgs args)

{

   tabControlAdv1.BorderStyle = BorderStyle.FixedSingle;

   tabControlAdv1.BorderColor = Color.Red;

   //Cancels the tab page closing

   args.Cancel = true;

}
Private Sub tabPageAdv1_Closing(ByVal sender As Object, ByVal args As TabPageAdvClosingEventArgs)

   tabControlAdv1.BorderStyle = BorderStyle.FixedSingle

   tabControlAdv1.BorderColor = Color.Red

   'Cancels the tab page closing 

   args.Cancel = True

End Sub