Activate a form and process button click at the same time?

问题

I'm using Windows Forms in C#.

I have a main form with a couple of toolbars that contain toolStripButtons. After working with another form that contains data, the main form loses focus and clicking on a toolStripButton does not trigger OnClick event: the first click activates the main form, and only the second click actually pushes the button. I need the user to click a button only once to trigger a Click event, any ideas on how to do that? Thanks.

Notes:

I was using MDI and there were no problems clicking on the parent's form buttons. But now the paramount is to have forms freely floating across multiple displays.
The worker forms have the main form as the Owner property, this way they stay on top of the main form.
When I click on the button of an inactive form, none of MouseHover, MouseEnter, MouseDown nor MouseUp fires. It's just main form's Activate event that fires.
There is a treeView (inside a tabControl, inside a splitContainer, inside a panel), on the main form. Its items are selected upon a first mouse click, even if the main form is inactive. I guess not all controls are equal!

回答1:

What you need to do is create a class that inherits ToolStrip and handles the WndProc. This is one way to do it. There are others.

private class MyToolStrip : ToolStrip
{
    private const uint WM_LBUTTONDOWN = 0x201;
    private const uint WM_LBUTTONUP   = 0x202;

    private static bool down = false;

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WM_LBUTTONUP && !down)
        {
            m.Msg = (int)WM_LBUTTONDOWN;
            base.WndProc(ref m);
            m.Msg = (int)WM_LBUTTONUP;
        }

        if (m.Msg == WM_LBUTTONDOWN) down = true;
        if (m.Msg == WM_LBUTTONUP)   down = false;
        base.WndProc(ref m);
    }
}

I've also seen this solution:

protected override void WndProc(ref Message m)
{
    // WM_MOUSEACTIVATE = 0x21
    if (m.Msg == WM_MOUSEACTIVATE && this.CanFocus && !this.Focused)
        this.Focus();
    base.WndProc(ref m);
}

I ran into this at the last place I worked, I think the solution I came up with worked more like the latter, but I don't have access to the exact code I used.

回答2:

if u have Form without borders, so this logic was working for you built in :)

form.FormBorderStyle = FormBorderStyle.None

来源：https://stackoverflow.com/questions/6947163/activate-a-form-and-process-button-click-at-the-same-time

标签

winforms

focus

form-control