c# determine in witch text box is cursor?

Question

3.00/5 (2 votes)

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C#

private void cutToolStripMenuItem_Click(object sender, EventArgs e)
{
    if (textBox1.SelectionLength > 0)
        textBox1.Cut();
}

private void copyToolStripMenuItem_Click(object sender, EventArgs e)
{
        if (textBox1.SelectionLength > 0)
            textBox1.Copy();
}

private void pasteToolStripMenuItem_Click(object sender, EventArgs e)
{
    if (Clipboard.GetDataObject().GetDataPresent(DataFormats.Text))
    {
            textBox1.Paste();
    }
}

private void undoToolStripMenuItem_Click(object sender, EventArgs e)
{
    if (textBox1.CanUndo)
    {
        textBox1.Undo();
        textBox1.ClearUndo();
    }
}

I make this code but i dont know how to copy, paste and cut text box where is cursor? Not textbox1 like in this code?

Posted 17-Apr-13 9:36am

ant 385

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Comments

Sergey Alexandrovich Kryukov 17-Apr-13 15:43pm

Witch means this:
http://en.wikipedia.org/wiki/Witchcraft

Sorry, I did not mean to make fun of your English or anything like that, I just advise you to use a spell checker. Spell checkers are anywhere, so this is a matter of mere politeness.
And "which text box is cursor" is also unclear. Do you mean which text box has a (usually blinking) cursor indicating where the keyboard input currently goes, also know as "caret"? Or something else?

—SA

Sergey Alexandrovich Kryukov 17-Apr-13 15:47pm

And you always need to tag the UI library you are using or application type (WPF? Forms? ASP.NET? Silverlight? something else?).
—SA

3 solutions

Solution 2

You could do this using the events GotFocus and LostFocus. Everytime one of your multiple textboxes receives the focus (GotFocus event) set a variable of type TextBox in your Form to the TextBox that just received the GotFocus event. When any other control receives the focus set that same variable to null. This way you'll be able to tell if one of your textboxes was active before the menu strip had been clicked. If anything else beside the textboxes had the focus before the click the variable will be set to null.
In your tool strip menu click events just use the textbox variable instead of TextBox1.

Regards,

— Manfred

Posted 17-Apr-13 10:23am

Manfred Rudolf Bihy

Comments

Sergey Alexandrovich Kryukov 17-Apr-13 16:27pm

Good points, a 5.
—SA

Maciej Los 17-Apr-13 18:09pm

Agree, +5!

Sergey Alexandrovich Kryukov 17-Apr-13 18:56pm

Maciej, Manfred,

Unfortunately, I could not read Maciej's joke and tell my related one: someone removed the thread:
http://www.codeproject.com/Questions/579571/Forumplusinplusasp-netpluscplus-23

This is the second time today when I loose my answer due to removed question. Are we facing a kind of sabotage?

—SA

Maciej Los 17-Apr-13 19:01pm

Sometimes it happens twice in a day...

Sergey Alexandrovich Kryukov 17-Apr-13 19:07pm

I believe that. Actually, the post is marked "Closed", not "Deleted", I don't know what it is. Perhaps one of administrators though we're going too much off-topic.
—SA

Manfred Rudolf Bihy 18-Apr-13 3:20am

As of now I'm missing 4.49 % of my Solutions because of deletions. I'm not really worried about it though. I think some OP's delete their Posts even when they've got an answer. Maybe it should be handled like in the other fora. Any thread that has a reply to it cannot be deleted not even by OP.

Cheers!

Sergey Alexandrovich Kryukov 18-Apr-13 9:50am

Really?! (Why so precise figure? Did you count?) That's more than I would think.
Some posts deserve to be deleted even with answers, the problem is who decides it.

I would not worry too much, too, excluding one case: I keep some permalink URLs in my records for reuse. If such pages are deleted, that's really a waste of time, if not worse: the case when the answer is referenced earlier and deleted later.

Maybe your idea about protection from deletion could improve things.

—SA

Manfred Rudolf Bihy 18-Apr-13 15:53pm

That's quite easy to figure out. On the Membership page there in the contribution list the figure for Q&A answers is given counting all non deleted answers. Klicking on that link will take you to the list of all answers you have given along with the Count including those that were deleted, as These deleted answers are included in that list.
For me the first list says 1616 and the detailed list says 1692. The rest is a little bit of applied maths. I reckon you can work it out. ;)

Sergey Alexandrovich Kryukov 18-Apr-13 16:04pm

Yes, thank you, Manfred. I know, but it does not indicate who deleted what.
And I also noticed "Close" status, which is different from "Deleted". Do you know how it may come?
—SA

Manfred Rudolf Bihy 18-Apr-13 16:15pm

Well you did ask "Why so precise figure? Did you Count?". So I thought I'd tell you how I figured it out without counting. :)
As to the closed Status I can only guess, but I think I remember something a while back when a question was closed because enough People voted it as "Not a question". In that case I do remember seeing also a list of people who voted it as such. I do think though that knowing why a question was deleted is more important than knowing who actually did it. Have you raised the issue yet in "Sugs and Bugs"? This whole issue is a two edged sword. Being able to delete SPAM fast is the good part even if there is an answer to that post, but being able to delete questions where somebody has given time and thought to a well conceived solution is the bad part. There are always two (or even more) ways to look at such things.

Sergey Alexandrovich Kryukov 18-Apr-13 16:43pm

Yes, yes, later you did. I just was surprised that you actually came to an exact figure.

I did not see much of reports due to not-a-question reasons because in most cases I immediately remove non-question. I think it's not a big harm to those who did not bother about asking a question because they can always re-post in a better way but filters out many which won't ever be a question (this practice confirms it, to certain extent)...
Unfortunately, at this time, "delete" image is not showing again, probably another cycle of site code upgrade...

And this is a double-edged sword too, because, if I did not delete them, some of the posts are so bad (I don't even mention commercial spam), that members reports on the account itself... :-)

—SA

Solution 3

As Sergey Alexandrovich Kryukov said :

You can use the Control property Focused like that :

C#

foreach (Control item in this.Controls)
            {
                if (item.Focused&&item.GetType()==typeof(TextBox))
                {
                    MessageBox.Show("I'm the textbox focused");
                }
            }

Or for more easy and direct approach with ActiveControl :

C#

if (ActiveControl.GetType() == typeof(TextBox))
            {
                MessageBox.Show(ActiveControl.ToString());
            }

Sorry if you feel that is a repost.

Posted 17-Apr-13 19:30pm

Thomas Barbare

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-04-17T09:55:00

Please see my comment to the question. I think my assumption is correct. You are probably looking at the text input cursor, also know as caret. The idea is: you need a control having a focus, and the focus always means keyboard focus. Only one control at a time, in the whole system, has a focus, and the input goes there. The focus does not have to be in the top-level windows, but typically it is there. All .NET libraries returns the focus to a previously focused control when a window/form is activated. That's basically all.

The libraries of .NET FCL usually provide class members to check up if some control currently has focus (which can be named Focused, IsFocused), and windows/control has a method to determine if there is a focused control in its hierarchy of children, such as ContainsFoculs. It can also return a control currently owning the focus or virtual focus (a control which may or may not be focused but is supposed to get focus if the form/window is shown and activated), such as ActiveControl.

As you did not properly tag your UI library, you will have to find relevant methods by yourself, but this is really easy, with the use of appropriate MSDN help page.

—SA