How to disable the parent form when a child form is active?
C#WinformsC# Problem Overview
How to disable a parent form when child form is active using c#?
C# Solutions
Solution 1 - C#
Have you tried using Form.ShowDialog() instead of Form.Show()?
ShowDialog shows your window as modal, which means you cannot interact with the parent form until it closes.
Solution 2 - C#
Are you calling ShowDialog()
or just Show()
on your child form from the parent form?
ShowDialog
will "block" the user from interacting with the form which is passed as a parameter to ShowDialog
.
Within the parent you might call something like:
MyChildForm childForm = new MyChildForm();
childForm.ShowDialog(this);
where this
is the parent form.
Solution 3 - C#
Its simple, use
Form.ShowDialog();
Instead of
Form.Show();
While using Form.ShowDialog()
, you cannot interact with the parent form until it closes.
Solution 4 - C#
What you could do, is to make sure to pass the parent form as the owner when showing the child form:
Form newForm = new ChildForm();
newForm.Show(this);
Then, in the child form, set up event handlers for the Activated
and Deactivate
events:
private void Form_Activated(object sender, System.EventArgs e)
{
if (this.Owner != null)
{
this.Owner.Enabled = false;
}
}
private void Form_Deactivate(object sender, System.EventArgs e)
{
if (this.Owner != null)
{
this.Owner.Enabled = true;
}
}
However, this will result in a truly wierd behaviour; while you will not be able to go back and interact with the parent form immediately, activating any other application will enable it, and then the user can interact with it.
If you want to make the child form modal, use ShowDialog
instead:
Form newForm = new ChildForm();
newForm.ShowDialog(this);
Solution 5 - C#
While using the previously mentioned childForm.ShowDialog(this) will disable your main form, it still doesent look very disabled. However if you call Enabled = false before ShowDialog() and Enable = true after you call ShowDialog() the main form will even look like it is disabled.
var childForm = new Form();
Enabled = false;
childForm .ShowDialog(this);
Enabled = true;
Solution 6 - C#
ChildForm child = new ChildForm();
child.Owner = this;
child.Show();
// In ChildForm_Load:
private void ChildForm_Load(object sender, EventArgs e)
{
this.Owner.Enabled = false;
}
private void ChildForm_Closed(object sender, EventArgs e)
{
this.Owner.Enabled = true;
}
Solution 7 - C#
Form1 frmnew = new Form1();
frmnew.ShowDialog();
Solution 8 - C#
@Melodia
Sorry for this is not C# code but this is what you would want, besides translating this should be easy.
FORM1
Private Sub Form1_MouseEnter(sender As Object, e As EventArgs) Handles MyBase.MouseEnter
Me.Focus()
Me.Enabled = True
Form2.Enabled = False
End Sub
Private Sub Form1_MouseLeave(sender As Object, e As EventArgs) Handles MyBase.MouseLeave
Form2.Enabled = True
Form2.Focus()
End Sub
FORM2
Private Sub Form2_MouseEnter(sender As Object, e As EventArgs) Handles MyBase.MouseEnter
Me.Focus()
Me.Enabled = True
Form1.Enabled = False
End Sub
Private Sub Form2_MouseLeave(sender As Object, e As EventArgs) Handles MyBase.MouseLeave
Form1.Enabled = True
Form1.Focus()
End Sub
Hope this helps
Solution 9 - C#
You can do that with the following:
Form3 formshow = new Form3();
formshow.ShowDialog();
Solution 10 - C#
You can also use MDIParent-child form. Set the child form's parent as MDI Parent
Eg
child.MdiParent = parentForm;
child.Show();
In this case just 1 form will be shown and the child forms will come inside the parent. Hope this helps
Solution 11 - C#
For me this work for example here what happen is the main menu will be disabled when you open the registration form.
frmUserRegistration frmMainMenu = new frmUserRegistration();
frmMainMenu.ShowDialog(this);
Solution 12 - C#
If you are just trying to simulate a Form.ShowDialog call but WITHOUT blocking anything (kinda like a Simulated Dialog Form) you can try using Form.Show() and as soon as you show the simulated dialog form then immediately disable all other windows using something like...
private void DisableAllWindows()
{
foreach (Form f in Application.OpenForms)
if (f.Name != this.Name)f.Enabled = false;
else f.Focus();
}
Then when you close your "pseudo-dialog form" be sure to call....
private void EnableAllWindows()
{
foreach (Form f in Application.OpenForms) f.Enabled = true;
}
Solution 13 - C#
Why not just have the parent wait for the child to close. This is more than you need.
// Execute child process
System.Diagnostics.Process proc =
System.Diagnostics.Process.Start("notepad.exe");
proc.WaitForExit();