Limit Tabs / Forms
Posted: Thu Jan 16, 2020 4:45 pmIs there a way to limit the number of forms/tabs that a user can open in the MDI Parent?
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Posted: Thu Jan 16, 2020 4:45 pmRe: Limit Tabs / Forms
Posted: Thu Jan 16, 2020 4:46 pmSound like a job for a plugin.
Re: Limit Tabs / Forms
Posted: Thu Jan 16, 2020 4:48 pmYeah I know that but not where to start???
Re: Limit Tabs / Forms
Posted: Thu Jan 16, 2020 4:49 pm- Code: Select all
Manager.MDIParentForm.MdiChildren
Re: Limit Tabs / Forms
Posted: Thu Jan 16, 2020 4:50 pmSBarnes wrote:Yeah I know that but not where to start???
Manager has a property, MDIParentForm and that has a property OwnedForms which is a list of Form. Use the count of that to see if you have exceeded your imposed limit in a handler of the Manager.FormFactory BeforeFormStart event.
Re: Limit Tabs / Forms
Posted: Thu Jan 16, 2020 4:51 pmYou are making it too easy for him Mike 
Re: Limit Tabs / Forms
Posted: Thu Jan 16, 2020 4:52 pmScott.Pearce wrote:You are making it too easy for him Mike
Sorry - I didn't realise we were supposed to be making it difficult.
Re: Limit Tabs / Forms
Posted: Thu Jan 16, 2020 4:55 pmNo if you wanted to make it difficult you would have given me the code in CIL but it's not April yet 
Re: Limit Tabs / Forms
Posted: Thu Jan 16, 2020 5:53 pmAh see you promised not to make it difficult and unless I've missed something I found a bug in the below code only the After Start message shows up and looking in Just Decompile in the form Factory BeforeFormStart is declared but never checked for being set and called and OwnedForms.Length is always zero.
- Code: Select all
public class ApplicationManagerPlugin : System.MarshalByRefObject, JiwaFinancials.Jiwa.JiwaApplication.IJiwaApplicationManagerPlugin
{
public override object InitializeLifetimeService()
{
// returning null here will prevent the lease manager
// from deleting the Object.
return null;
}
public void Setup(JiwaFinancials.Jiwa.JiwaApplication.Plugin.Plugin Plugin)
{
//System.Diagnostics.Debugger.Launch();
Plugin.Manager.FormFactory.BeforeFormStart += BeforeFormStart;
Plugin.Manager.FormFactory.AfterFormStart += AfterFormStart;
}
public void BeforeFormStart(JiwaFinancials.Jiwa.JiwaApplication.Forms.Form form, string RecordID, bool NewRecord, object OwnerForm)
{
System.Windows.Forms.MessageBox.Show("Before form start " + form.Manager.MDIParentForm.MdiChildren.Length.ToString());
}
public void AfterFormStart(JiwaFinancials.Jiwa.JiwaApplication.IJiwaForm JiwaForm)
{
System.Windows.Forms.MessageBox.Show("After form start " + JiwaForm.Manager.MDIParentForm.MdiChildren.Length.ToString());
}
}
Re: Limit Tabs / Forms
Posted: Fri Jan 17, 2020 9:06 amOk, then use the property Scott suggested - Manager.MDIParentForm.MdiChildren.
I only suggested OwnedForms because in our LogOff method we use that to close all open forms - whether they are MDI Children or not:
I only suggested OwnedForms because in our LogOff method we use that to close all open forms - whether they are MDI Children or not:
- Code: Select all
Public Sub LogOff()
Dim cancelargs As New System.ComponentModel.CancelEventArgs
RaiseEvent LoggingOff(cancelargs)
If cancelargs.Cancel = False Then
If Not MDIParentForm Is Nothing Then
For Each form As Form In MDIParentForm.OwnedForms
form.Close()
Next
End If
...