I have to catch when the user is pressing the up arrow on the keyboard, while the button has the focus. I have written this code to handle the KeyUp event for the button:
private void btnValider_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Up)
{
//do stuff
}
}
but this function didn't handle pressing the up arrow key.
I don't know if it what i want to do is possible or if i have to handle this event from the form ?
As Hans Passant suggested,
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == Keys.Up && btnValider.Focused)
{
MessageBox.Show("hit");
return true;
}
else
return base.ProcessCmdKey(ref msg, keyData);
}
handle key down event for the button.
Related
I am trying to disable tab key from datagridview, also to create my own event on it. Also if it is possible to disable up,down,right,left and enter key.
OnLoad Event
this.dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter;
On KeyDownEvent
private void gridInvoice_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Tab)
{
//SelectNextControl(dataGridView1, true, true, true, true);
// or Parent.SelectNextControl() if the grid is an only child, etc.
e.Handled = true;
}
}
With code above tab key it works. I moves to next cell. How can i prevent this?
You have to use PreviewKeyDown event instead of KeyDown.
According to Microsoft Control.PreviewKeyDown Event Description
Some key presses, such as the TAB, RETURN, ESC, and arrow keys, are typically ignored by some controls because they are not considered input key presses.
You need to insert the code below in PreviewKeyDown event if you want to use KeyDown event when Tab is pressed.
if (e.KeyCode == Keys.Tab) { e.IsInputKey = true; }
When in editmode thanks to Jimi
I'm sorry I thought the problem too simple. How about this. You can override ProcessCmdKey to ignore Tab when you in editmode of your DGV. Is it too brute?
I think this is simple than make a new edit control but not elegance too.
protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData)
{
if (keyData == Keys.Tab && dataGridView1.EditingControl != null) { return true; }
else return base.ProcessCmdKey(ref msg, keyData);
}
from Similar problem
I'm trying to call function with left and right buttons on keyboard, but not sure how to do it proper way.
In result of this attempt, pressing on left/right keyboard keys just switches between GUI elements usual way, and does not works for given functions. Not sure what is wrong here:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Right)
{
func1();
}
else if (e.KeyCode == Keys.Left)
{
func2();
}
}
An alternative to enabling keypreview as mentioned in some comments would be to override the ProcessCmdKey Method.
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == Keys.Right)
{
func1();
return true;
}
else if (keyData == Keys.Left)
{
func2();
return true;
}
return base.ProcessCmdKey(ref msg, keyData);
}
Please see this MSDN article for more information.
The code you have works correctly, you're just not allowed to press anything beforehand. I think you're looking for a general keydown as shown here
I currently have the following event handler which catches the Ctrl+Enter key combo in my Form code:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter && e.Control)
{
// Stuff
}
}
I also have two non-ReadOnly TextBoxes in the form, one of which is multiline, while the other one isn't. Whenever I hit Ctrl+Enter, the event does get handled, but it also registers as an Enter keypress when the focus is in either TextBox. What I want to do is register the key combo without the Enter keypress modifying the text in either box. Is there any way I could go about doing this?
Your best choice is use ProcessCmdKey: Just add this to your Form add it will work:
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == (Keys.Control | Keys.Enter))
{
// Stuff
return true;
}
return base.ProcessCmdKey(ref msg, keyData);
}
You should use the PreviewKeyDown event instead and set the IsInputKey property accordingly:
private void Form1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
if (e.KeyCode == Keys.Enter && e.Control)
{
// Stuff
e.IsInputKey = false;
}
}
UPDATE: From the name of your handler, I guess you added it to the Form's KeyPress/KeyDown/PreviewKeyDown event. Instead you should register the method I showed above with each TextBox's PreviewKeyDown event.
To not destroy what already works for you, you may leave your code as it is and just add a handler to the TextBox's PreviewKeyDown event where you set IsInputKey to false for the specified keys, but don't do your // Stuff.
I made a program in WinForms that shows a blank screen, and then if you press Enter then something happens..
well i used this code:
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
label1.Visible = false;
Colors.Start();
}
Now when I tried to add some buttons to the blank screen, the option to click on Enter just don't work anymore... no matter what I do. and please don't earse this question, I'm kind of new in programming and I know there's alot of questions like that one, but I couldn't understand them...
thanks
Is the form's AcceptButton property assigned to a button?
If so, that could be grabbing the Enter keystroke first.
An example of the suggestion by Hans Passant:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == Keys.Enter)
{
MessageBox.Show("Enter");
return true; // optionally prevent further action(s) on Enter; such as Button clicks
}
return base.ProcessCmdKey(ref msg, keyData);
}
}
Note that if you return true, then controls like the buttons will not get the Enter keystroke.
I want to have the Esc key undo any changes to a textbox since it got focus.
I have the text, but can't seem to figure out how to capture the Esc key. Both KeyUp and KeyPressed don't seem to get it.
This should work. How are you handling the event?
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Escape)
{
MessageBox.Show("Escape Pressed");
}
}
Edit in reply to comment - Try overriding ProcessCmdKey instead:
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == Keys.Escape && myTextBox.Focused)
{
MessageBox.Show("Escape Pressed");
}
return base.ProcessCmdKey(ref msg, keyData);
}
is this what you're looking for?
string origStr = String.Empty;
private void txtOrig_Enter(object sender, EventArgs e)
{
origStr = txtOrig.Text;
}
private void txtOrig_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == Convert.ToChar(Keys.Escape))
{
txtOrig.Text = origStr;
}
}
Supposedly some keys are not considered "input keys" and so are not listened to by default. You need to handle PreviewKeyDown first to enable it.
myTextBox.PreviewKeyDown += (s, e) => {
if (e.KeyCode == Keys.Escape) {
e.IsInputKey = true;
Debug.Print("ESC should get handled now.");
}
};
However, results from testing say otherwise, so it may depend on framework version. For me, whether I do that or not, KeyDown does not get called for ESC, and whether I do that or not, KeyPress DOES get called for ESC. This is while a TextBox has focus, so it may also depend on the control.