I have gridviewname_CellClick(object sender, GridViewCellEventArgs e) event. I want this event to be called in Form load.
When i try
gridviewname_CellClick(sender,e)- i get exception as e as not an event of GridViewCellEventArgs, how to call this on form load?
Any inputs?
It can't be done. I suggest that you put your codes from GrisViewName_Click in another function then call that in your form load & GrisViewName_Click events.
In general, you should not call event handlers directly.
Instead, you should move the event handler code to a separate function, then call that function in the handler and wherever else you want.
To answer the question, you need to create your own GridViewCellEventArgs instance and pass it to the handler function.
Related
How I can check if event was fired programmatically?
Namely I have an Ext.tree.Panel and listen for it selectionchange event. How I can check within handler if event was fired manually by user (row click) or via select() method?
option 1 :
For most of the events eOpts arguments is passed to event. Depending on the event this is fill by ExtJs. If event is fired manually thus eOpts is never filled or filled customly.
option 2:
If manual event firing is happens in code you can manipulate add a custom argument
As far as I know and my research there is no solution based on scope of selectionchange event. However from a design perspective this is how it should be since selectionchange event should not depend on caller. From what is told I can say that 2 different event is needed. Where different action is taken. (which is the definition of an event :))
Therefore my suggestion is to override select method and fire a custom event in which you do what you want do differently. If needed in rowclick event another custom event can be fired.
You can override this in subclasses or you can use Ext.override for global scope.
You can't, really. The "best" way would be to listen for an itemclick event and check whether the selectionchange event fired within some small threshold amount.
I have some stuff in the OnShow event of a main form that fills a few listboxes with a procedure StuffLB. I need these listboxes refilled after any of my other forms have been shown with a call to ShowModal.
After such a modal form closes, the main form is just repainted there where the modal form was and its OnShow event does not fire.
The only way I can get the OnShow event to fire is by:
frmM.Hide;
frmB.ShowModal;
frmM.Show;
Is the only way I can get the listboxes filled to use the StuffLB call after every ShowModal call on sub forms? I have about 25 forms that are available.
I would had hoped that OnShow meant when it was shown again, either in part or in full.
I'd appreciate any help or suggestions.
OnShow event fires when form becomes visible. What you may use is OnActivate event. However, since it is your code that calls ShowModal of another form, just put required code in a separate method and call here and in FormShow.
Is there a way to know if a Windows Form is closing?
I would have to know from another class with a reference to the windows form. Something like:
if WinForm.IsClosing then ....
How about using the event Form.FormClosing Event
The FormClosing event occurs as the form is being closed. When a form
is closed, it is disposed, releasing all resources associated with the
form. If you cancel this event, the form remains opened. To cancel the
closure of a form, set the Cancel property of the FormClosingEventArgs
passed to your event handler to true.
I am developing application using ExtJS 4.1. I have one spinner field and I want to change value of that method programatically. I have set up listeners like change, spinup and spindown for this same spinner field.
Now I would like to know how to prevent listener method of these events getting fired only when I change the value of spinner field through my program?
For example,
var mySpinner = Ext.ComponentQuery.query('#foopanel > #mySpinner')[0];
mySpinner.setValue(2000);
When mySpinner.setValue(2000); line is executed, change event of mySpinner gets fired and as I have listener method for this change event, that listener method is executed.
Is it possible to prevent invocation of change event listener method?
Thanks..
You could suspend all events by calling
mySpinner.suspendEvents();
mySpinner.setValue(2000);
mySpinner.resumeEvents();
That would be the cleanest an easiest way IMO
And that's also a usecase why this methods exist
i have a windows form that inherites from another windows form in the same project,
the problem is when i click a button in the inherited form the eventhandler fires twice
performing the event in the parent form and then performs the event in the inherited form
.
any suggestions?
http://www.metacafe.com/watch/852308/inheritied_forms_c/
in this video u will see what am doing exactly and the problem am facing is in the end of this video .. u will see exactly what i mean –
This is the way it's supposed to work. You have two event handlers, both are executed. I would suggest the following:
In the parent form, add a method
Protected Overridable Sub OnOKButtonClick()
MsgBox("Parent Form OK Button Clicked")
End Sub
which you call from the button's click event. In the inherited form, remove the button click event handler, and override the OnButtonClick method
Protected Overrides Sub OnOKButtonClick()
MsgBox("Inherited Form OK Button Clicked")
End Sub
This should accomplish what you are after.