MdiParent Issue

  • Thread starter Thread starter dm_dal
  • Start date Start date
D

dm_dal

All,
I have a c# windows application that I'm working on. The main window
(frmMain) IsMdiContainer is set to true. I have a second form (frm2) that
is instantiated as a MdiChild form.

frm2 is instantiated like thus:

private void initChildForms()
{
Form myForm = new frm2();
myForm.MdiParent = this;
myForm.Show();
}

My issue is that within frm2, when I try to set

this.Height = this.MdiParent.ClientSize.Height;

I get a null exception (MdiParent is null). How else can I get the
MdiParents ClientSize.Height ?
 
You must be calling that too early. Try waiting for the ParentChanged event.
 
Do you want the MDI child to fill the parent's client area? If so, then
after showing the child, thus after childForm.Show(), set the WindowState
property of the child to Maximized.
 
dm_dal said:
I have a c# windows application that I'm working on. The main window
(frmMain) IsMdiContainer is set to true. I have a second form (frm2) that
is instantiated as a MdiChild form.

frm2 is instantiated like thus:

private void initChildForms()
{
Form myForm = new frm2();
myForm.MdiParent = this;
myForm.Show();
}

My issue is that within frm2, when I try to set

this.Height = this.MdiParent.ClientSize.Height;

I get a null exception (MdiParent is null). How else can I get the
MdiParents ClientSize.Height ?
Click to expand...

Where are you calling the code that gets the client size?
 
It's being called in the frm2 constructor, right after the call to
InitializeComponent()

I'm placing two custom controls on frm2 (the first is a custom panel with a
lable and combobox, it's Dock property is set to DockStyle.Top, the second
is a third-party control who's height is determined by the containers
ClientSize.Height). The issue is when I initialize the form, The third party
control fills the form height and the custom panel is overlaid on top of the
third party control. However, if I resize my form when it's running, the
third party control adjust it's size (as it should) and is no longer under
the panel control (this is correct behavior).

So, I figured if I could set frm2's height to samller than I want it
(design-time) then resize it during initization (run-time) then the that
would compensate for the incorrect sizing.

dmy
 
Hi dmy,
You may try putting this statement ,
this.Height = this.MdiParent.ClientSize.Height;
in your On_Activate event handler of your MDI child form.
If you still have problem, please let me know.
Thanks!


Best regards,

Ying-Shen Yu [MSFT]
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security

This posting is provided "AS IS" with no warranties and confers no rights.
You should not reply this mail directly, "Online" should be removed before
sending, Thanks!

--------------------
| From: "dm_dal" <[email protected]>
| References: <[email protected]>
<[email protected]>
| Subject: Re: MdiParent Issue
| Date: Mon, 29 Sep 2003 08:07:32 -0500
| Lines: 49
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|
| It's being called in the frm2 constructor, right after the call to
| InitializeComponent()
|
| I'm placing two custom controls on frm2 (the first is a custom panel with
a
| lable and combobox, it's Dock property is set to DockStyle.Top, the second
| is a third-party control who's height is determined by the containers
| ClientSize.Height). The issue is when I initialize the form, The third
party
| control fills the form height and the custom panel is overlaid on top of
the
| third party control. However, if I resize my form when it's running, the
| third party control adjust it's size (as it should) and is no longer under
| the panel control (this is correct behavior).
|
| So, I figured if I could set frm2's height to samller than I want it
| (design-time) then resize it during initization (run-time) then the that
| would compensate for the incorrect sizing.
|
| dmy
| | > "dm_dal" <[email protected]> scripsit:
| > > I have a c# windows application that I'm working on. The main window
| > > (frmMain) IsMdiContainer is set to true. I have a second form (frm2)
| that
| > > is instantiated as a MdiChild form.
| > >
| > > frm2 is instantiated like thus:
| > >
| > > private void initChildForms()
| > > {
| > > Form myForm = new frm2();
| > > myForm.MdiParent = this;
| > > myForm.Show();
| > > }
| > >
| > > My issue is that within frm2, when I try to set
| > >
| > > this.Height = this.MdiParent.ClientSize.Height;
| > >
| > > I get a null exception (MdiParent is null). How else can I get the
| > > MdiParents ClientSize.Height ?
| >
| > Where are you calling the code that gets the client size?
| >
| > --
| > Herfried K. Wagner
| > MVP · VB Classic, VB.NET
| > <http://www.mvps.org/dotnet>
|
|
|
 
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