How to detect when Tab Control loses its focus

[=?Utf-8?B?RWl0YW4=?=]

Hello,

I have a WinForm application. The form has one Tab Control and one
ToolStrip. I would like to know what would be the best way to detect when
the user is "leaving" the Tab Control and "moving" into ToolStrip.

Thank you
EitanB

[=?Utf-8?B?QWRyaWFuIFZvaWN1?=]

You can handle the 'Leave' event of the TabControl to know when this object
loses focus and the 'Enter' event of the ToolStrip to know when the toolstrip
gets the focus.

Adrian.
--
[Please mark my answer if it was helpful to you]


"Eitan" wrote:

Hello,

I have a WinForm application. The form has one Tab Control and one
ToolStrip. I would like to know what would be the best way to detect when
the user is "leaving" the Tab Control and "moving" into ToolStrip.

Thank you
EitanB

[=?Utf-8?B?RWl0YW4=?=]

Hello,

The leave on the Tab Control is not triggered when I press one of the
controls on the ToolStrip..... It only triggers when I switch tabs.

Thank you
Eitan

"Adrian Voicu" wrote:

>
You can handle the 'Leave' event of the TabControl to know when this object
loses focus and the 'Enter' event of the ToolStrip to know when the toolstrip
gets the focus.

Adrian.
--
[Please mark my answer if it was helpful to you]


"Eitan" wrote:

Hello,

I have a WinForm application. The form has one Tab Control and one
ToolStrip. I would like to know what would be the best way to detect when
the user is "leaving" the Tab Control and "moving" into ToolStrip.

Thank you
EitanB

[Peter Duniho]

Eitan wrote:

Hello,

I have a WinForm application. The form has one Tab Control and one
ToolStrip. I would like to know what would be the best way to detect when
the user is "leaving" the Tab Control and "moving" into ToolStrip.

I would expect the Enter and Leave events in the Control class to
provide that information. Is this not working for you?

[=?Utf-8?B?RWl0YW4=?=]

Hello,

The Leave on the Tab Control is not triggered when I press one of the
controls on the ToolStrip..... It only triggers when I switch between tabs
on the Tab Control....

Thank you
Eitan
"Peter Duniho" wrote:

Eitan wrote:

Hello,

I have a WinForm application. The form has one Tab Control and one
ToolStrip. I would like to know what would be the best way to detect when
the user is "leaving" the Tab Control and "moving" into ToolStrip.

I would expect the Enter and Leave events in the Control class to
provide that information. Is this not working for you?

[Peter Duniho]

Eitan wrote:

Hello,

The Leave on the Tab Control is not triggered when I press one of the
controls on the ToolStrip..... It only triggers when I switch between tabs
on the Tab Control....

But do you not get an Enter event for the ToolStrip?

It seems to me that if you don't get a Leave event for the Tab Control,
the technically the Tab Control hasn't actually lost focus. So in some
respect, you are asking the wrong question. Perhaps you should look
more closely at what UI changes actually occur when what you think is
focus changing happens.

All that said, there's always the WndProc. You can override the WndProc
for the Tab Control and see what messages are sent when the UI changes
in the way you want to detect (for example, use Debug.WriteLine() to
trace the message values). Then you can either take advantage of that
information to find a managed way to handle the change, or just keep the
WndProc overridden and watch for those same messages.

Pete

[=?Utf-8?B?RWl0YW4=?=]

The TabControl is loosing the focus you are right.

Using the WndProc might be a good idea. How would one trap the WndProc
messages?

Thank you,
Eitan

"Peter Duniho" wrote:

Eitan wrote:

Hello,

The Leave on the Tab Control is not triggered when I press one of the
controls on the ToolStrip..... It only triggers when I switch between tabs
on the Tab Control....

But do you not get an Enter event for the ToolStrip?

It seems to me that if you don't get a Leave event for the Tab Control,
the technically the Tab Control hasn't actually lost focus. So in some
respect, you are asking the wrong question. Perhaps you should look
more closely at what UI changes actually occur when what you think is
focus changing happens.

All that said, there's always the WndProc. You can override the WndProc
for the Tab Control and see what messages are sent when the UI changes
in the way you want to detect (for example, use Debug.WriteLine() to
trace the message values). Then you can either take advantage of that
information to find a managed way to handle the change, or just keep the
WndProc overridden and watch for those same messages.

Pete

[Peter Duniho]

Eitan wrote:

The TabControl is loosing the focus you are right.

Using the WndProc might be a good idea. How would one trap the WndProc
messages?

http://msdn2.microsoft.com/en-us/lib...l.wndproc.aspx

[=?Utf-8?B?RWl0YW4=?=]

Thanks
Eitan

"Peter Duniho" wrote:

Eitan wrote:

The TabControl is loosing the focus you are right.

Using the WndProc might be a good idea. How would one trap the WndProc
messages?

http://msdn2.microsoft.com/en-us/lib...l.wndproc.aspx

[=?Utf-8?B?RWl0YW4=?=]

I read the article with the example for a form. How ever, how would I
overide the WndProc for a control (TabPage) on the form?

In my case, the form is defined as:
public partial class WeldProgramSetup : Form

My TabControl is defined as:
private System.Windows.Forms.TabControl tabControl_WP_ChannelInfo;

and my TabPage is defined as:
private System.Windows.Forms.TabPage tabPage_WP_Flow;

Thank you,
Eitan

"Peter Duniho" wrote:

Eitan wrote:

The TabControl is loosing the focus you are right.

Using the WndProc might be a good idea. How would one trap the WndProc
messages?

http://msdn2.microsoft.com/en-us/lib...l.wndproc.aspx

[Peter Duniho]

Eitan wrote:

I read the article with the example for a form. How ever, how would I
overide the WndProc for a control (TabPage) on the form?

The same way you do it for a form: you create a new class that inherits
the class you want to override, and use that class in place of the
original one.

Pete

[zacks]

On Aug 15, 12:34 pm, Eitan <[e-mail]:

Hello,

I have a WinForm application. The form has one Tab Control and one
ToolStrip. I would like to know what would be the best way to detect when
the user is "leaving" the Tab Control and "moving" into ToolStrip.

Thank you
EitanB

I use the Validating Event handler.

http://msdn2.microsoft.com/en-us/lib...alidating.aspx