Reordering controls in a regular panel

问题

ContolPanel is type: FlowLayoutPanel sender is a panel that i have a click on.

How do i reorder the order my Usercontrols is set in my FlowLayoutPanel?

This is how i add my Objekts(UserControls) to my FlowLayoutPanel

private void button1_Click_1(object sender, EventArgs e)
    {
        int count = 0;
        var panel = sender as Panel;
        switch (panel.Name)
        {

            case "TypePanel":
                ContolPanel.Controls.Add(new Type().Initialize(_ConnectionStr, _connection, _brugerLNr, _klinikLNr, _speciale, _ICPC, _segmenterStrings).SetModifiedCallBack(FilterModified));
                break;
        }
    }

I add this like 4-5 times and have alot of diffrent once, this this is just one. What is the best method to reorder thies with a "+" and "-" button?

I thouth of saveing all the controls in a List<Controls> And then reorder them with something like

ControlList[1] = ControlList[2]

and then inset all the controls from the list into the FlowLayoutPanel. But this just dosnt seem to work out for me. Is there a easy way of doing this smart?

回答1:

You can add your user controls to a panel and set Dock property of your user controls to DockStyle.Top, then as a good idea change z-order of user control using Parent.SetChildIndex to move it up or down.

To do so, add these two methods to your user controls:

public void MoveUp()
{
    if (this.Parent == null)
        return;

    var index = this.Parent.Controls.GetChildIndex(this);
    if (index <= this.Parent.Controls.Count)
        this.Parent.Controls.SetChildIndex(this, index + 1);
}

public void MoveDown()
{
    if (this.Parent == null)
        return;

    var index = this.Parent.Controls.GetChildIndex(this);
    if (index > 0)
        this.Parent.Controls.SetChildIndex(this, index - 1);
}

Also you can support move up using + and moving down using - keys, by overriding ProcessCmdKey in your user control:

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    switch (keyData)
    {
        case Keys.Add:
            this.MoveUp();
            break;
        case Keys.Subtract:
            this.MoveDown();
            break;
        default:
            break;
    }
    return base.ProcessCmdKey(ref msg, keyData);
}

And also you can add a move up Button and a move down Button in your user control and handle Click event of those buttons in your user control:

private void MoveUpButton_Click(object sender, EventArgs e)
{
    this.MoveUp();
}

private void MoveDownButton_Click(object sender, EventArgs e)
{
    this.MoveDown();
}

Since we created MoveUp and MoveDown public, You can move a user control up and down in form:

myUserControl1.MoveUp();

来源：https://stackoverflow.com/questions/32888790/reordering-controls-in-a-regular-panel

标签

winforms

user-controls

panel