Develop Reference

How to trigger event when clicking on a selected tab page header of a tab control

I am doing a Winform application in C# and I have some tab pages, say tabPage1, tabPage2 and tabPage3, in a tab control, and tabPage1 is selected.
I want to trigger event when any tab page header is clicked, but I could do it only for page change (by using SelectedIndexChanged) but not click on a selected tab page header.
I tried with Selecting and Selected events but both of them didn't not work. I searched on MSDN but didn't find any Click event defined on a page header. So how should I achieve this?
One further question, is it possible, and how, to detect DoubleClick on a selected tab page?

Just use the tabcontrol's MouseDoubleClick event. You'll have to iterate the tabs to find out what specific tab was clicked:
private void tabControl1_MouseDoubleClick(object sender, MouseEventArgs e) {
for (int ix = 0; ix < tabControl1.TabCount; ++ix) {
if (tabControl1.GetTabRect(ix).Contains(e.Location)) {
// Found it, do something
//...
break;
}
}
}
Do keep in mind that this is completely undiscoverable to the user, he'll never think to double-click the tab. You'll have to write a manual.

You should be doing your stuff on
TabIndexChanged
If you want to load the contents on your 3rd tab, for example, handle the TabIndexChanged on your tab control, do a switch for each tabPage.Index and then do whatever is needed when user clicks on that tab.

private void tabPage1_Layout(object sender, LayoutEventArgs e)
{
//do something
}

Usercontrol removal

My problem is the following. I have a form which when it loads up invokes a user control onto it. On the user control I have buttons. With the buttons I would like to make the user control disappear with all the buttons and picture boxes on it and make a new user control appear. The appear part is all right but I can't make the user control disappear with all the objects on it.
Can you help me with this one?
So the dispose method closes the usercontrol well, but then I can't make the new user control appear. Code is like this:
akusztikusUserControl auc = new akusztikusUserControl();
public menuUserControl()
{
InitializeComponent();
}
private void akusztikus_btn_Click(object sender, EventArgs e)
{
this.Dispose();
this.Controls.Add(auc);
}
}

Have you considered using Panel or a TableLayoutPanel control ? In both cases you can remove controls through the .controls.remove option
You can then just add the user control to the panel / tablelayoutpanel whenever you need to use it again.

How can I give focus to any Control after a Tab has been selected

I have a problem .. I have an error list form (works as validation summary screen) that displays validation of controls that require to save data but have no values.
This form opened when validation occurs on controls in another form that has tab control contains all controls that have validation.
The problem is when I double click on Error List form, I need cursor focus on tab control that have this control and focus on the control itself
The result : focus happened on tab control only .. but I need to focus on the control also

Use Control.Focus() in your tab selected event handler.

Call Focus() to focus on the next control.

Step 1 : You need to handle the Enter event of the TabPage Control to perform the operations when TabPage gains the focus.
Step 2: You can call Select() function on Required control to gain the Focus.
Try This: if you want to gain the Focus of TextBox control in TabPage2 use this code
tabPage2.Enter += new System.EventHandler(this.tabPage2_Enter);
private void tabPage2_Enter(object sender, EventArgs e)
{
textBox1.Select();
}

I think the trick is to set socus on the tab page first, then set focus on the actual control you want to focus on.
What I was seeing is if the tab page was already selected setting focus to the control works fine. However, if the tab was programmatically activated then setting focus on the control alone does not work.
So this works for me reliably:
// first select and focus the tab
TabsResult.SelectedTab = tabRequest;
TabsResult.SelectedTab.Focus();
// then focus the control
txtRequestUrl.Focus();

Adding close button on tab header in c# winforms [duplicate]

My scenario is the following:
I am working on a winforms application in C# that has a button inside the main page of a tabcontrol that will generate another tabpage each time that it is clicked. Each new tabpage will contain a layout defined by a user control.
My Questions are:
How can I allow the user to then close one of the tabs that were created dynamically at runtime?
How might I go about modifying the tabcontrol itself so that it has a small 'X' in each tab that the user may click on in order to close that particular tab? (Like Firefox has)
How can I expose the SelectedIndex property of the tabcontrol to the user control if I want to close the tab with a button inside the user control instead?

I found this code and was very helpful to me:
private void tabControl_MouseUp(object sender, MouseEventArgs e)
{
// check if the right mouse button was pressed
if(e.Button == MouseButtons.Right)
{
// iterate through all the tab pages
for(int i = 0; i < tabControl1.TabCount; i++)
{
// get their rectangle area and check if it contains the mouse cursor
Rectangle r = tabControl1.GetTabRect(i);
if (r.Contains(e.Location))
{
// show the context menu here
System.Diagnostics.Debug.WriteLine("TabPressed: " + i);
}
}
}
}
TabControl: How To Capture Mouse Right-Click On Tab

I created a derived tab control about one year ago. I am not going to post the source here, because it's about 700 lines long and coded quite messy. Maybe I will find some time to clean the code up and then release it here. For now I will briefly outline the way it is build.
Each tab page has a 'X' icon to the left of the title and the tab pages support reordering by drag and drop and moving them between multiple tab control.
I choose the easy way to get the icon on the tab pages. The tab control has the TabControl.ImageList property and a tab page has a TabPage.ImageIndex property. So I just added three icons to a image list - normal, hover, pressed - and process the mouse events.
With TabControl.GetTabRect() you can test if the mouse is over a specific tab pages and with some math you find if it is over the icon. Then you just need to change the icon depending on the mouse button state and eventually remove the tab page under the mouse if the button was pressed.
The main problem with this solution is, that calculating if the mouse is over the icon requires to know where the icon is painted relative to the tab page and this might change with a new windows version. And the icon is to the left of the title, but that does not look too bad.

I did the following:
on the create (add) TabPage stage, I added a toolStrip
ToolStrip ts = new ToolStrip();
ts.Dock = DockStyle.Top;
ts.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
Then, create the X button and add it to toolstrip
ToolStripButton ToolStripButton = new ToolStripButton("X");
ts.Items.Add(ToolStripButton);
create an event on clicking the X button
ToolStripButton.Click += new EventHandler(ToolStripButton_Click);
add toolstrip to the tabpage
tabControl1.TabPages[curenttabpage].Controls.Add(ts);
now for the ToolStripButton_Click is as follows:
void ToolStripButton_Click(object sender, EventArgs e)
{
ToolStripButton t = (ToolStripButton)(sender);
ToolStrip ts = t.Owner;
TabPage tb = (TabPage)
(ts.Parent);tabControl1.TabPages.Remove(tb);
}
Maybe it is not as you want, but it will work well.

I created a setup that is similar.
Each control that is added to the tab page at runtime is derived from a special base control I created. This base control has a close button (along with some other features such as safe to close flag).
Close tab code I'm using on my base control:
TabPage tabpage = (TabPage)this.Parent;
TabControl tabControl = (TabControl)tabpage.Parent;
tabControl.TabPages.Remove(parent);

I know this is an old thread but I did find this link that will allow you to "hide" tabs in an array and then you can just re-load the tabs you want at run time. I added this more for a place I can easily find it again.

This code might help throgh closing the tab controls with middle mouse click :
private void tabControl1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button != System.Windows.Forms.MouseButtons.Middle)
return;
for (int i = 0; i < MainTabControl.TabPages.Count; i++)
{
if (this.MainTabControl.GetTabRect(i).Contains(e.Location))
{
this.MainTabControl.TabPages.RemoveAt(i);
return;
}
}
}

It´s works!
TabPage tabpage = (TabPage)this.Parent;
TabControl tabControl = (TabControl)tabpage.Parent;
tabControl.TabPages.Remove(tabpage);

TabControl Cancel change of tabs

I am using TabControl_SelectedIndexChanged event when the user change tabs. The TabControl.SelectedIndex / TabControl.SelectedTab return only the new tab. Is there any way I can get the previous tab? Or must I stick with the obvious store the current tab every time I change tabs?
I want to use this to cancel a change of tabs under certain conditions, like there is unsaved changes.

If you want to cancel the change of a tab, you can use the Deselecting event. There you can cancel the change by setting property Cancel of the provided TabControlCancelEventArgs to true.

Check out http://msdn.microsoft.com/en-us/library/system.windows.forms.tabcontrol.selected%28v=vs.80%29.aspx
There are events better suited for what you want to do.

I used tabControl Selected method to prevent users selecting a certain tab, in other word, to disable a tab page.
TabPage currentPage;
private void tabControl1_Selected(object sender, TabControlEventArgs e)
{
if (e.TabPage == tabNotAllowed)
{
tabControl1.SelectedTab = currentPage;
MessageBox.Show("You cannot use the tab you selected.");
}
else
{
currentPage = e.TabPage;
}
}