SplitContainer Panel Resize Issue
The General Problem
The application is C# WinForms .Net 4.0.
I have a SplitContainer that takes up most of the form, it is set to Anchor in all directions so it re-sizes along with the form. The left panel (Panel1) has a simple menu, no problems here. The right panel (Panel2) is more complex and contains a number of nested tab controls (with lots of controls) - it is painfully complex, but it's not changing.
The problem is that re-sizing the form doesn't work so well. In fact, if you resize by dragging the edges slowly then it works ok, but drag quickly or use the "restore" button (top-right of form) then the issue occurs.
My Control Hierarchy
The following is a simple example of my control hierarchy, its definitely a cut down version but does highlight the nested tab control which may help with replication:
Debug Details
After some debugging it appears that it is in fact Panel2 (a child of the split container) that doesn't resize properly, and the actual SplitContainer itself resizes fine.
Here are the debug values that show this...
Full width form, before resize:
splitContainerMain.Width: 1479
splitContainerMain.Panel2.Width: 1206
panelCenter.Width: 1203
tabControlMain.Width: 1215
All as expected, splitContainerMain.Panel2.Width is smaller than splitContainerMain.Width .
After resize where the issue occurs:
splitContainerMain.Width: 815
splitContainerMain.Panel2.Width: 1206
panelCenter.Width: 1203
tabControlMain.Width: 1215
As can be seen, the splitContainerMain.Width has resized as desired, but the splitContainerMain.Panel2.Width and subsequently its children have not.
NOTE : Please remember, the width updates correctly if I manually resize the form slowly - this is not a problem with me not correctly setting any anchors.
My Efforts So Far
I am wondering if the issue is related to this problem here, but I am not prepared to create a new "MySplitContainer" to try and solve this problem.
What I have tried to do is use various Form resize events and try to set the widths manually, but to no avail. I think what I would like to try is to set the Panel2.Width value from within an event of some sort.
What I Am Looking For
splitContainerMain.Panel2.Width to resize correctly when the splitContainerMain size changes? Panel2.Width should be? And how can I set that value from the Form.Resize event? (or another event?) From what I see u should set anchor to none for controls that are creating problem including splitcontainer pannels.
Also I would suggest to use dock fill property to best use the splitcontainers.
If need further help please provide designer file so can have a better look.
Exactly the same problem, below code worked for me:
On tableBorder
Dock = DockStyle.Fill;
On split Container, (no anchoring)
Dock = DockStyle.None;
On tableBorder SizeChanged event
private void tableBorder_SizeChanged(object sender, EventArgs e)
{
new Thread(() => { resizeMe(); }).Start();
}
private void resizeMe()
{
Thread.Sleep(100);
this.BeginInvoke((Action)(() => {
doIt();
}));
}
private void doIt()
{
splitContainer.Height = tableBorder.Height;
splitContainer.Width = tableBorder.Width;
}
There is a small lag, but works
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