I have a function that is linked to a control. If I double click the control the editor will go to the function below.
My question is if I have function below and I know it is linked to a control, is there shortcut to find this control on the screen ?
In some situations there are to many controls and indicators on screen, it is difficult to search all the controls and indicator names in controls and indicator list.
private void MOVE_START_Click(object sender, EventArgs e)
{
}
(I assume you want to find the control in the designer, not at runtime).
You can easily find the control(s) that use this handler by right-clicking the MOVE_START_Click method and selecting "Find All References". It should show something like:
Form1.Designer.cs - (1, 1): button1.Click += new System.EventHandler(MOVE_START_Click);
Then in the designer, just above the properties window, you can select that control from the combobox:
No there is no short cut that gets automatically created.
One thing you could do is have the form with all of the controls on it listen for key down events. First you have to set the KeyPreview property on the form to true then add a KeyDown event listener to the form. After that you can listen for specific hot-keys to be pressed like ctrl-f
private void form_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.F && e.Modifiers == Keys.Control)
{
// Set the control you want to map to the hotkey as active here
myControl.Focus()
}
}
Is there a "generic" event for a Windows Form that will trigger any time the user clicks anything on a form? I need to make sure that a certain text box has input focus at all times, so if the user clicks on a button (or anything else, for that matter), the input focus needs to be redirected to this text box.
Is there an event in the Form class that will handle this, or do I have to handle a Click event to all controls recursively on the form?
I did some digging but I can't find what I want so far.
I actually figured something out - every time the TextBox loses focus, just refocus it.
textBox.LostFocus += TextBox_LostFocus;
private void TextBox_LostFocus(object sender, EventArgs e)
{
textBox.Focus();
}
I'm creating form application on c# . I have dragged a textbox with some text in it.
private void textBox1_Click(object sender, EventArgs e)
{
}
Now what is the event for the onlick on textBox1 ?
I need to add this on that function textBox1.Clear();
P.S I searched everywhere. But all i can find is jquery and javascripts... No c#.
EDIT
I tried onfocus like below..but its not working
private void textBox1_OnFocus(object sender, EventArgs e)
{
MessageBox.Show("dsd");
}
If you want to do something when the control is clicked the handle the Click event, not the TextChanged event. Presumably you just double-clicked the control in the designer. That will only handle the default event. To handle other events, open the Properties window, click the Events button at the top and then double-click the appropriate event.
That said, is Click really appropriate? What if the user enters the TextBox using the Tab key? If what you actually want to do is act when the control gets focus then you should handle the Enter event.
You can handle OnFocus/GotGocus event in the TextBox, and clear the text in the textbox.
Hope this helps.
I have a windows form with a tool strip on it containing a text box and some buttons (think browser url bar with a go button, back, forward)
I want pressing enter to activate the goButton just as clicking it would, which I believe is what TextBox.AcceptsReturn = false is for.
I don't see anything that seems to fit the bill for "tell me what button on the form is the one that we will activate".
What am I missing?
A Form has a default button, but a specific control does not (out of the box anyway).
In your scenario, I would probably handle invoking the goButton.Click event by monitoring the keys pressed waiting for the Enter key to be pressed.
The easiest way is to set the forms "Accept Button" to the button control you want. This can be done in the designer.
I know this is an Old Question, but for someone who might to to lazy or just a beginner ,
handler might look like too much work ( though it isn't really )
But there is an easier work around for this,
you can make a panel for each of them ( 1 Textbox and 1 Button for Example ) , and set the Defaultbutton for Each panel as you need.
I used this for my site, where I had several Ajax panel , and I Wanted Each to have their own search box on different subjects and work with Enter Button.
Looks like an old question, but I will provide my solution.
private void ChangeDefaultButton()
{
if (this.TextBox.Focused)
{
this.AcceptButton = button;
}
else
{
this.AcceptButton = button1;
}
}
And then add this method to the Focus Events of the text boxes. Like...
private void TextBox_Enter(object sender, EventArgs e)
{
ChangeDefaultButton();
}
And
private void TextBox_Leave(object sender, EventArgs e)
{
ChangeDefaultButton();
}
I'm creating a custom dropdown box, and I want to register when the mouse is clicked outside the dropdown box, in order to hide it. Is it possible to detect a click outside a control? or should I make some mechanism on the containing form and check for mouseclick when any dropdownbox is open?
So I finally understand that you only want it to close when the user clicks outside of it. In that case, the Leave event should work just fine... For some reason, I got the impression you wanted it to close whenever they moved the mouse outside of your custom dropdown. The Leave event is raised whenever your control loses the focus, and if the user clicks on something else, it will certainly lose focus as the thing they clicked on gains the focus.
The documentation also says that this event cascades up and down the control chain as necessary:
The Enter and Leave events are hierarchical and will cascade up and down the parent chain until the appropriate control is reached. For example, assume you have a Form with two GroupBox controls, and each GroupBox control has one TextBox control. When the caret is moved from one TextBox to the other, the Leave event is raised for the TextBox and GroupBox, and the Enter event is raised for the other GroupBox and TextBox.
Overriding your UserControl's OnLeave method is the best way to handle this:
protected override void OnLeave(EventArgs e)
{
// Call the base class
base.OnLeave(e);
// When this control loses the focus, close it
this.Hide();
}
And then for testing purposes, I created a form that shows the drop-down UserControl on command:
public partial class Form1 : Form
{
private UserControl1 customDropDown;
public Form1()
{
InitializeComponent();
// Create the user control
customDropDown = new UserControl1();
// Add it to the form's Controls collection
Controls.Add(customDropDown);
customDropDown.Hide();
}
private void button1_Click(object sender, EventArgs e)
{
// Display the user control
customDropDown.Show();
customDropDown.BringToFront(); // display in front of other controls
customDropDown.Select(); // make sure it gets the focus
}
}
Everything works perfectly with the above code, except for one thing: if the user clicks on a blank area of the form, the UserControl doesn't close. Hmm, why not? Well, because the form itself doesn't want the focus. Only controls can get the focus, and we didn't click on a control. And because nothing else stole the focus, the Leave event never got raised, meaning that the UserControl didn't know it was supposed to close itself.
If you need the UserControl to close itself when the user clicks on a blank area in the form, you need some special case handling for that. Since you say that you're only concerned about clicks, you can just handle the Click event for the form, and set the focus to a different control:
protected override void OnClick(EventArgs e)
{
// Call the base class
base.OnClick(e);
// See if our custom drop-down is visible
if (customDropDown.Visible)
{
// Set the focus to a different control on the form,
// which will force the drop-down to close
this.SelectNextControl(customDropDown, true, true, true, true);
}
}
Yes, this last part feels like a hack. The better solution, as others have mentioned, is to use the SetCapture function to instruct Windows to capture the mouse over your UserControl's window. The control's Capture property provides an even simpler way to do the same thing.
Technically, you'll need to p/invoke SetCapture() in order to receive click events that happen outside of your control.
But in your case, handling the Leave event, as #Martin suggests, should be sufficient.
EDIT: While looking for an usage example for SetCapture(), I came across the Control.Capture property, of which I was not aware. Using that property means you won't have to p/invoke anything, which is always a good thing in my book.
So, you'll have to set Capture to true when showing the dropdown, then determine if the mouse pointer lies inside the control in your click event handler and, if it doesn't, set Capture to false and close the dropdown.
UPDATE:
You can also use the Control.Focused property to determine if the control has got or lost focus when using a keyboard or mouse instead of using the Capture with the same example provided in the MSDN Capture page.
Handle the Form's MouseDown event, or override the Form's OnMouseDown
method:
enter code here
And then:
protected override void OnMouseDown(MouseEventArgs e)
{
if (!theListBox.Bounds.Contains(e.Location))
{
theListBox.Visible = false;
}
}
The Contains method old System.Drawing.Rectangle can be used to indicate if
a point is contained inside a rectangle. The Bounds property of a Control is
the outer Rectangle defined by the edges of the Control. The Location
property of the MouseEventArgs is the Point relative to the Control which
received the MouseDown event. The Bounds property of a Control in a Form is
relative to the Form.
You are probably looking for the leave event:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.leave.aspx
Leave occurs when the input focus leaves the control.
I just wanted to share this. It is probably not a good way of doing it that way, but looks like it works for drop down panel that closes on fake "MouseLeave", I tried to hide it on Panel MouseLeave but it does not work because moving from panel to button leaves the panel because the button is not the panel itself. Probably there is better way of doing this but I am sharing this because I used about 7 hours figuring out how to get it to work. Thanks to #FTheGodfather
But it works only if the mouse moves on the form. If there is a panel this will not work.
private void click_to_show_Panel_button_MouseDown(object sender, MouseEventArgs e)
{
item_panel1.Visible = true; //Menu Panel
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if (!item_panel1.Bounds.Contains(e.Location))
{
item_panel1.Visible = false; // Menu panel
}
}
I've done this myself, and this is how I did it.
When the drop down is opened, register a click event on the control's parent form:
this.Form.Click += new EventHandler(CloseDropDown);
But this only takes you half the way. You probably want your drop down to close also when the current window gets deactivated. The most reliable way of detecting this has for me been through a timer that checks which window is currently active:
[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern IntPtr GetForegroundWindow();
and
var timer = new Timer();
timer.Interval = 100;
timer.Tick += (sender, args) =>
{
IntPtr f = GetForegroundWindow();
if (this.Form == null || f != this.Form.Handle)
{
CloseDropDown();
}
};
You should of course only let the timer run when the drop down is visible. Also, there's probably a few other events on the parent form you'd want to register when the drop down is opened:
this.Form.LocationChanged += new EventHandler(CloseDropDown);
this.Form.SizeChanged += new EventHandler(CloseDropDown);
Just don't forget to unregister all these events in the CloseDropDown method :)
EDIT:
I forgot, you should also register the Leave event on you control to see if another control gets activated/clicked:
this.Leave += new EventHandler(CloseDropDown);
I think I've got it now, this should cover all bases. Let me know if I'm missing something.
If you have Form, you can simply use Deactivate event just like this :
protected override void OnDeactivate(EventArgs e)
{
this.Dispose();
}