I want to set the focus on a popup form I have created when the mouse hover it,
I checked MSDN and they said to use the SetFocuse method but it does not work.
I tried this:
private void POPUPmainmanue_MouseHover(object sender, EventArgs e)
{
POPUPmainmanue.SetFocus();
}
It's strange but I could find no SetFocus() method for a Form on MSDN.
However, using the Activate() methods works well enough.
private void POPUPmainmanue_MouseHover(object sender, EventArgs e)
{
POPUPmainmanue.Activate();
}
Also, always make sure you do not forget to set the EventHandler:
POPUPmainmanue.MouseHover += POPUPmainmanue_MouseHover;
You also did not mention whether you are using WinForms or WPF, although I think it's the former as you say 'form'. Again, what exactly is POPUPmainmanue? A form? I don't think so. A form does not have a SetFocus() method.
I don't think it's easy to implement, cause it's not very clear the question:
It's possible to set focus on textbox when the mouse hovers the form, and another more clear possiblity to set focus on a form when a form opens.
this.BringToFront();
this.Activate();
Related
I have a WindowForm and some controls on it.
My point is that when I click button "?" on top-right of the datagridview, it will show a picture box and when I click outside the pictureBox, it must invisible.
My MainForm
MyPictureBox
I have searched some topics on this site, but some dont work, some work partly. Like
this.
I also tried:
void pictureBox1_LostFocus(object sender, EventArgs e)
{
if (pictureBox1.Visible)
pictureBox1.Visible = false;
}
But when I click on button2, button3, ... The pictureBox wasn't invisible.
Any solution will be highly appreciated.
I think your pictureBox1 isn't losing focus, cause it never actually GOT focused. Set it to be focused after making it visible.
Oh, I have encountered this before...
I was making a Label that you could double click and it would allow you to edit the Label.Text, like a TextBox. However, I was having problems hooking into the events to know when the user had clicked off the Control and wished to stop editing. I tried Control.LostFocus, and Control.Leave, but nothing. I even got frustrated/desperate and tried some silly ones like Control.Invalidated.
What I ended up having to do was subscribe to the Click event of the Form/Container/Control behind it.
However, putting the responsibility of wiring up this event into the Form that wants to use it is poor design. What you can do, however is to make the constructor to Control class require a reference to the owner/parent/container as a parameter. That way, the requirements are not hidden, they must be satisfied before you can get a object instance, and the control can wired up to the Form.Click within itself, where that logic belongs.
private Form owner;
public EditLabel(Form Owner)
{
this.owner = Owner;
owner.Click += EndEditing;
}
Add this method in designer.cs:
pictureBoxEvent this.MouseLeave += new EventHandler(pictureBox_MouseLeave);
Add this code in cs file:
private void pictureBox_MouseLeave(object sender, EventArgs e)
{
pictureBox1.Visible = false;
}
I created a UserControl with the buttons Save, Close and Cancel. I want to close the form without saving on the Cancel button, prompt a message to save on the Close button and Save without closing on the Save button. Normally, I would have used this.Close() on the Cancel button, but the UserControl doesn't have such an option. So I guess I have to set a property for that.
Scrolling down the "Questions that may already have your answer" section, I came across this question: How to close a ChildWindow from an UserControl button loaded inside it? I used the following C# code:
private void btnCancel_Click(object sender, EventArgs e)
{
ProjectInfo infoScreen = (ProjectInfo)this.Parent;
infoScreen.Close();
}
This does the job for one screen, but I wonder if I have to apply this code for all the screen I have? I think there should be a more efficient way. So my question is: Do I need to apply this code for every form I have, or is there another (more efficient) way?
you can use
((Form)this.TopLevelControl).Close();
you can use the FindForm method available for any control:
private void btnCancel_Click(object sender, EventArgs e)
{
Form tmp = this.FindForm();
tmp.Close();
tmp.Dispose();
}
Do not forget to Dispose the form to release resources.
Hope this helps.
You also can close one form in any part of the code using a remote thread:
MyNamespace.MyForm FormThread = (MyNamespace.MyForm)Application.OpenForms["MyForm"];
FormThread.Close();
I found the simple answer :) I all ready thought of something like that.
To close a WinForm in a ButtonClicked Event inside a UserControl use the following code:
private void btnCancel_Click(object sender, EventArgs e)
{
Form someForm = (Form)this.Parent;
someForm.Close();
}
I'm trying to call a method as soon as a TextBox on my screen gets 'un-focused' if that makes any sense? The user types in a username and as soon as that textbox loses focus I want to fire an event that checks if that username is indeed available.
Thanks!
There is a Control.Leave in C#, which I think is perfect for your purpose.
you can go to events of the textbox in visual studio, and find the Leave event.
The code generated will be like :
private void txtbox_Leave(object sender, EventArgs e)
{
//Check for available operation Code
}
Please explore the LostFocus event in a textbox. Hope it helps
select your object and to choose the panel of the properties and click on event.To unroll until LEAVE and double-click above.that will give you:
private void object_Leave( object sender, EventArgs e)
{
////put your code here
}
In WPF Try this:
TextBox.LostFocus
This will work:
Go to the "properties" of your textbox. You will see a yellow lightning bolt in the first line tab. There you will find all possible events that can be triggered. Search for "Leave" entry, double-click it. There you can put whatever you want.
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 am working on a C# WinForm application.
I want to trigger some processing once the form has been "shown" and the layout of the form is complete.
I am using the "_Shown" event, but this seems to trigger before the layout of the form has completed. Is there event I can use that fires once the layout is complete?
Put Application.DoEvents() at the start of the form's Shown event handler. This will force all the controls to be rendered.
I don't see an event after Shown you can use for this purpose. Could you not use a timer to delay your processing in the Shown event?
An old trick in VB6 used to be to use the Paint event:
bool firstShown = false;
void form_Paint(Object sender, EventArgs e) {
if ( !firstShown ) {
YourMethodThatNeedsToRunOnShown();
firstShown = true;
}
//the rest of your paint method (if any)
}
It is a little hacky, but it does work
This works for me and is much less "hacky" than other suggestions:
protected override void OnLayout(LayoutEventArgs levent)
{
base.OnLayout(levent);
if(someControl == null)
return; // be careful of OnLayout being called multiple times
// otherwise, do some stuff here, set control sizes, etc.
}
AS far as I can remember the event order is something like
Form.Load
Form.Layout
Form.VisibleChanged
Form.GotFocus
Form.Activated
Form.Shown
So if something is still happening after Form.Show it's because of the way you coded it.
Are you maybe creating the form dynamically?
The best solution is the Shown() event: http://msdn.microsoft.com/en-us/library/system.windows.forms.form.shown.aspx
"The Shown event is only raised the first time a form is displayed; subsequently minimizing, maximizing, restoring, hiding, showing, or invalidating and repainting will not raise this event."
Try using Form.GotFocus (inherited from control)..
something like this.
private void Form1_Load(object sender, EventArgs e)
{
this.GotFocus += new EventHandler(Form1_gotFocus);
this.Focus();
}
private void Form1_gotFocus(object sender, EventArgs e)
{
// You will need to Switch focus from form at the end of this function,
//to make sure it doesnt keep Firing.
}
According To msdn , the following happens:
When you change the focus by using the keyboard (TAB, SHIFT+TAB, and so on), by calling the Select or SelectNextControl methods, or by setting the ContainerControl..::.ActiveControl property to the current form, focus events occur in the following order:
Enter
GotFocus
Leave
Validating
Validated
LostFocus