If the cursor is in a specific textBox, delete only that textBox text with a button click

Question

I am building a simple calculator. I have three textBoxes: textBox1 (first operand), textBox2 (second operand), and textBox3 (result). I have numerous operand functions that can be performed. I also have a button that will clear all fields, as well as other functions.

I am having difficulty with the code needed to delete the text in a specific textbox with a button only when the cursor is in that textbox.

Ex: if cursor is in textBox1, the button only clears that textbox.

Any help is much appreciated.

Thanks.

score 2 · Accepted Answer · edited May 23 '17 at 10:28

2

When the Button is clicked it will gain focus.

So you need to keep track of which of your TextBoxes got focus last.

Create a class level variable for that:

TextBox focusedTextBox = null;

Now hook up this event with the Enter event of all three TextBoxes:

private void textBoxes_Enter(object sender, EventArgs e)
{
    focusedTextBox = sender as TextBox;
}

Then this will only clear the one your user was in last:

private void buttonClearCurrent_Click(object sender, EventArgs e)
{
    if (focusedTextBox != null) focusedTextBox.Text = "";
}

edited May 23 '17 at 10:28

Community

1
1

answered Apr 02 '16 at 07:09

TaW

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Thank you, this is exactly what I was having a problem with. I appreciate your help. – E. My Apr 02 '16 at 17:37

score 0 · Answer 2 · answered Apr 02 '16 at 00:35

0

In this case you have to use the Focused property in the textbox. But you need to make a loop to identify which text box is focused.

like:

var focusedControl;
foreach(var control in this.Controls)
{
    if(control is TextBox)
    {
        if(control.Focused)
        {
           focusedControl = control;
           break;
        }
    }
}

answered Apr 02 '16 at 00:35

Henrique

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This will not work when clicking the Button. He needs to keep track before! – TaW Apr 02 '16 at 06:58
Yep...you are right...your solution is a better way..thx..=D @Taw – Henrique Apr 02 '16 at 10:15

score 0 · Answer 3 · answered Apr 02 '16 at 00:40

0

You can use event: "MouseHover" or "MouseClick" and set textBox1.Text=""

answered Apr 02 '16 at 00:40

TariqN

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If the cursor is in a specific textBox, delete only that textBox text with a button click

3 Answers3