CODEWITHSUNDEEP
c#.netwinforms
lievendf
lievendf

Reputation: 90

Form.Owner - Owned forms not closing/hiding recursively

MSDN documentation states:

When a form is owned by another form, it is closed or hidden with the owner form. For example, consider a form named Form2 that is owned by a form named Form1. If Form1 is closed or minimized, Form2 is also closed or hidden.

Apparently the hiding isn't working recursively? When I have a stack of 4 forms who are parented to each other (GrandChildForm.Owner = Child; ChildForm.Owner = ParentForm; etc.), minimizing any one of them only minimizes it's direct child too.

Similar effect when closing one of these forms, only the FormClosing/Closed events of the direct child are raised, but not for the other accestors. Again the docs don't state that this doesn't work recursively:

If a form has any child or owned forms, a FormClosing event is also raised for each one. If any one of the forms cancels the event, none of the forms are closed.

What I'm trying to achieve:

Should this be implemented using extra event handling (subscribing to the Owner's FormClosing/FormClosed/SizeChanged events) or am I missing something here?

Upvotes: 2

Views: 3055

Answers (1)

Dima
Dima

Reputation: 1761

You can inherit your form from this class: 

public class AdvancedForm : Form
{
    protected override void OnFormClosing(FormClosingEventArgs e)
    {
        foreach (Form f in this.OwnedForms)
        {
            f.Close();
        }

        base.OnFormClosing(e);
    }

    protected override void OnSizeChanged(EventArgs e)
    {
        base.OnSizeChanged(e);

        foreach (AdvancedForm f in this.OwnedForms)
        {
            switch (this.WindowState)
            {
                case FormWindowState.Minimized:
                case FormWindowState.Normal:
                    f.WindowState = this.WindowState;
                    break;

                case FormWindowState.Maximized:
                    // just restore owned forms to their original sizes when parent form is maximized
                    f.WindowState = FormWindowState.Normal;
                    break;
            }

            // OnSizeChanged must be called, as changing WindowState property
            // does not raise SizeChanged event
            f.OnSizeChanged(EventArgs.Empty);
        }

    }
}

Or just use code from this class in "Closing" and "SizeChanged" event handlers.

Upvotes: 3

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