Databases
StackOverflow2013
Postsdbo
POReading from the keyboard
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POReading from the keyboard
    primarykey
    data
    text
    <p>I made a complex calculator in <code>C#</code> with two textboxes and buttons. I would like to operate the calculator using only the keyboard. I put the same code in <code>textbox1_Keypress</code>, <code>textbox2_Keypress</code> and in <code>Form_Keypress</code>. </p> <ol> <li>If the focus was in any of the textbox, the code works well but it writes the arithmetic sign in the textbox and I have to erase it manually to enter another value. How to make it not show in the textbox?</li> <li>Although I used the same code also in <code>Form_keypress</code> but whenever I'm out of the textboxes, the code won't work.</li> </ol> <p>Any suggestions about how to make the form response immediately for the keyboard at anytime and no matter where the focus was?</p> <pre><code>private void textBox1_TextChanged(object sender, EventArgs e) { if (textBox1.Text != "") { double d; if (flag == 1) { Double.TryParse(textBox1.Text, out d); getOperand.Real = d; } else if (flag == 2) { Double.TryParse(textBox1.Text, out d); getOperand.Magnitude = d; } } } private void textBox2_TextChanged(object sender, EventArgs e) { if (textBox2.Text != "") { double d; if (flag == 1) { Double.TryParse(textBox2.Text, out d); getOperand.Imag = d; } else if (flag == 2) { Double.TryParse(textBox2.Text, out d); getOperand.Angle = d; } } } private void textBox2_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == '+') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 1; } else if (e.KeyChar == '-') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 2; } else if (e.KeyChar == '*') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 3; } else if (e.KeyChar == '/') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 4; } else if (e.KeyChar == '=') { operand2.Real = getOperand.Real; operand2.Imag = getOperand.Imag; switch (flag1) { case 1: operand1 = operand1 + operand2; break; case 2: operand1 = operand1 - operand2; break; case 3: operand1 = operand1 * operand2; break; case 4: operand1 = operand1 / operand2; break; } if (flag == 1) { textBox1.Text = string.Format("{0:F2}", operand1.Real.ToString()); textBox2.Text = string.Format("{0:F2}", operand1.Imag.ToString()); } else if (flag == 2) { textBox1.Text = string.Format("{0:F2}", operand1.Magnitude.ToString()); textBox2.Text = string.Format("{0:F2}", operand1.Angle.ToString()); } // MessageBox.Show(string.Format("{0:D2}", operand1.Real.ToString())); // MessageBox.Show(string.Format("{0:D2}", operand1.Imag.ToString())); listBox1.Items.Add(operand1); } } private void Form1_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == '+') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 1; } else if (e.KeyChar == '-') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 2; } else if (e.KeyChar == '*') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 3; } else if (e.KeyChar == '/') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 4; } else if (e.KeyChar == '=') { operand2.Real = getOperand.Real; operand2.Imag = getOperand.Imag; switch (flag1) { case 1: operand1 = operand1 + operand2; break; case 2: operand1 = operand1 - operand2; break; case 3: operand1 = operand1 * operand2; break; case 4: operand1 = operand1 / operand2; break; } if (flag == 1) { textBox1.Text = string.Format("{0:F2}", operand1.Real.ToString()); textBox2.Text = string.Format("{0:F2}", operand1.Imag.ToString()); } else if (flag == 2) { textBox1.Text = string.Format("{0:F2}", operand1.Magnitude.ToString()); textBox2.Text = string.Format("{0:F2}", operand1.Angle.ToString()); } // MessageBox.Show(string.Format("{0:D2}", operand1.Real.ToString())); // MessageBox.Show(string.Format("{0:D2}", operand1.Imag.ToString())); listBox1.Items.Add(operand1); } } private void textBox2_KeyDown(object sender, KeyEventArgs e) { } private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == '+') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 1; } else if (e.KeyChar == '-') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 2; } else if (e.KeyChar == '*') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 3; } else if (e.KeyChar == '/') { operand1.Real = getOperand.Real; operand1.Imag = getOperand.Imag; flag1 = 4; } else if (e.KeyChar == '=') { operand2.Real = getOperand.Real; operand2.Imag = getOperand.Imag; switch (flag1) { case 1: operand1 = operand1 + operand2; break; case 2: operand1 = operand1 - operand2; break; case 3: operand1 = operand1 * operand2; break; case 4: operand1 = operand1 / operand2; break; } if (flag == 1) { textBox1.Text = string.Format("{0:F2}", operand1.Real.ToString()); textBox2.Text = string.Format("{0:F2}", operand1.Imag.ToString()); } else if (flag == 2) { textBox1.Text = string.Format("{0:F2}", operand1.Magnitude.ToString()); textBox2.Text = string.Format("{0:F2}", operand1.Angle.ToString()); } // MessageBox.Show(string.Format("{0:D2}", operand1.Real.ToString())); // MessageBox.Show(string.Format("{0:D2}", operand1.Imag.ToString())); listBox1.Items.Add(operand1); } } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USPicrofo Software
    1. USjoseph
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POReading from the keyboard
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POReading from the keyboard
      1. This table or related slice is empty.
      1. VTDownMod
    3. VO
      singulars
      1. POReading from the keyboard
      1. This table or related slice is empty.
      1. VTUpMod
    1. COPlease show some relevant code (i.e. the code from the `Keypress` handlers). Have you done any research? Have you looked at the [`KeyPreview`](http://msdn.microsoft.com/en-us/library/system.windows.forms.form.keypreview.aspx) property?
      singulars
      1. POReading from the keyboard
      1. USCodeCaster
    2. COi put true for KeyPreview.
      singulars
      1. POReading from the keyboard
      1. USjoseph
    3. COi just added the code to the question
      singulars
      1. POReading from the keyboard
      1. USjoseph
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload