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How to receive keyboard event in myUserControl? (Read 483 times)

GrandSon YaBB Newbies Offline I Love MindFusion! Posts: 8 Joined: Nov 26^th, 2023	How to receive keyboard event in myUserControl? Nov 26^th, 2023 at 3:50am	Print Post
	I implemented user-control(named MyControl) that have Label and RichTextBox. And I set it ControlNode.Control. MyControl want keyboard event (e.g. F2 key down). I can handled KeyDown event where MyControl on the Form directly, but set MyControl to ControlNode.Control MyControl_KeyDown method wasn't called. Below methods could't my problem. Code DiagramView.Focus(); Diagram.Selection.AddItem(ControlNode); DiagramView.Select(); MyControl.Focus(); Can MyControl on the ControlNode.Control receive Keyboard event directly?If can, how to reveive? Now, I have passed event to MyControl when ControlNode received KeyDown event. Is there alternative (better) way? I use MindFusion.Diagramming 7.0.0.


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Slavcho YaBB Moderator Offline tech.support Posts: 3173 Joined: Oct 19^th, 2005	Re: How to receive keyboard event in myUserControl? Reply #1 - Nov 26^th, 2023 at 5:28pm	Print Post
	Hi, I've played a bit with focus: 1. The Focus() method doesn't seem to work from form's constructor nor Loaded event; e.g. you could print CanFocus value to verify. The earliest focus worked for me is form's OnShown event: Code protected override void OnShown(EventArgs e) { var control = new MyControl(); var node = new ControlNode(diagramView, control); diagramView.Diagram.Nodes.Add(node); Debug.WriteLine(control.CanFocus); control.Focus(); } 2. Then actually the rich-text child control shows it has focus and keyboard events are received by it. So instead of control.KeyDown, handle richtext.KeyDown. If you prefer handling in user control, I've found it's possible to detect F2 in ProcessKeyPreview override: Code public partial class MyControl : UserControl { public MyControl() { InitializeComponent(); } void richTextBox1_KeyDown(object sender, KeyEventArgs e) { Debug.WriteLine("richTextBox1_KeyDown"); } const int WM_KEYDOWN = 0x100; const int WM_KEYUP = 0x101; protected override bool ProcessKeyPreview(ref Message m) { if (m.Msg == WM_KEYDOWN && (Keys)m.WParam == Keys.F2) Debug.WriteLine("F2"); return base.ProcessKeyPreview(ref m); } } Regards, Slavcho Mindfusion


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GrandSon YaBB Newbies Offline I Love MindFusion! Posts: 8 Joined: Nov 26^th, 2023	Re: How to receive keyboard event in myUserControl? Reply #2 - Nov 27^th, 2023 at 12:44am	Print Post
	Thanks slavcho. I focused MyControl in DiagramView_Click, and I key pressed then I could get KeyDown event directly.


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Slavcho YaBB Moderator Offline tech.support Posts: 3173 Joined: Oct 19^th, 2005	Re: How to receive keyboard event in myUserControl? Reply #3 - Nov 27^th, 2023 at 9:57am	Print Post
	Hi, I'm receiving direct MyControl_KeyDown events too if the rich-text is disabled. Do you need detecting F2 to enable the textbox and let users type? So if that's the only situation when you need to handle keyboard event on the user control, I guess UserControl.KeyDown should work fine. If you need to detect keys while rich-text is active, you might have to go through ProcessKeyPreview or handle textbox' own events. Regards, Slavcho Mindfusion


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