Open a .chm help file when F1 is pressed while mouse is over label

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Hello All,

Could you please help me to implement help functionality on my windows form?

I am trying to implement help functionality on my Windows forms where I need to display some data. I have an issue to associate the label with help file. The label is located on user control. I need to be able to open help file when I press F1 key while my mouse is over label.

The help functionally is working for text boxes but I can not get it for labels where some data are displayed.

Lora

Posted 12-May-11 15:53pm

Pora2

Updated 12-May-11 18:18pm

Sandeep Mewara

v2

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Sandeep Mewara 13-May-11 0:17am

~~K1?~~ ... F1 I think... typo.

Pora2 2-Jun-11 23:36pm

Thanks! My question is answered.

3 solutions

Solution 3

You may consider below code as well

C#

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            //Make Sure Form gets the key.
            KeyPreview = true;
        }

        protected override void OnKeyDown(KeyEventArgs e)
        {
            base.OnKeyDown(e);
            //1. Check Wether Key is F1
            //2. Chek mouse is over label or not
            if(e.KeyCode == Keys.F1 && label1.ClientRectangle.Contains(label1.PointToClient(MousePosition)))
            {
                //Open CHM file
            }
        }
    }

Posted 12-May-11 19:44pm

Manish Ranjan Kumar

Comments

Rojeh 13-May-11 4:06am

good one, my 5

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*dan!sh* · Accepted Answer · 2011-05-12T18:31:00

That may be because the label is not the focussed control. You can set the focus to the label in it's MouseHover event handler. Then, you will have to associate the label control with your HelpProvider control. Once you have done this, it should work fine. Following code snippets should help.

Event handlers for the label:

private void LabelMouseHover(object sender, MouseEventArgs e){
(sender as Label).Focus();
}

private void LabelMouseLeave(object sender, MouseEventArgs e){
(sender as Label).Focused = false; // Not sure if you can set this property, no VS and I am lazy enough to search. You can ignore this handler if you may
}

For your HelpProvider cotnrol, there is a method like SetShowHelp (or something similar) you can call that method and associate the help with the label.

Once you are done, set mouse over label and press F1: voila! it should work. :)

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-05-12T18:45:00

Just a note: this would be non-standard behavior which would make getting context-sensitive help counter-intuitive. Normal context-sensitive help behavior is based on focused control and/or selection, regardless of the mouse position.

Mouse position is intuitively viewed by the users as volatile: if the user is actively moving the mouse and can immediately see some visual feedback of mouse-over event such as color effect on control, it is always noticeable. When the user uses keyboard, she or he does not pay attention for the mouse position.

By these reasons, it's hard to expect the user gets how the mouse position affects the help on F1. Don't do it; design more expected and natural context-sensitive help based on keyboard focus. Alternatively, give up context-sensitive help and make just invocation of general help on F1, unconditionally.

—SA

Open a .chm help file when F1 is pressed while mouse is over label

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