Event

[Thomas]

Hi there

I build a class "ButtonClas s" with two private
Buttons, "OK" And "Cancel".
Now, I would like to use this class in a Windowsform for
example three times.

ButtonClass c1 = new ButtonClass();
ButtonClass c2 = new ButtonClass();
ButtonClass c3 = new ButtonClass();

I assume the EventListener and its function is in the
ButtonClass. How do I know know which Button was pressed,
because I have just one Listener for each of the Buttons?

Thanks for helping

Thomas

[Thomas]

Re: Event

Hi Mikael

Thank you for helping. I'll try it this evening.

[color=blue]
>-----Original Message-----
>Hi Thomas!
>
>In your case your buttonclass would have to throw events[/color]
that is picked up[color=blue]
>by your main class.
>
>First of you need to create delegates that tells[/color]
everyone what the event[color=blue]
>should look like. Place this outside your class.
>
>public delegate void OkClickEventHan dler(object sender,[/color]
EventArgs e);[color=blue]
>public delegate void CancelClickEven tHandler(object[/color]
sender, EventArgs e);[color=blue]
>
>public class ButtonClass
>{
> //Now inside your buttonclass you add the events so[/color]
that they can be[color=blue]
>fired.
> public event EventHandler OkClick;
> public event EventHandler CancelClick;
>
> //This is not really nessessary to have, but I[/color]
usually have it anyway[color=blue]
>since it
> //keeps things simple and that you might want to[/color]
change the event a bit[color=blue]
>if
> //you inherit from the ButtonClass
>
> protected virtual void OnOkClick(Event Args e)
> {
> if (OkClick != null) //If someone is ready to[/color]
handle the event[color=blue]
> {
> OkClick(this, e); //Fire the event
> }
> }
>
> protected virtual void OnCancelClick(E ventArgs e)
> {
> if (CancelClick != null) //If someone is ready[/color]
to handle the event[color=blue]
> {
> CancelClick(thi s, e); //Fire the event
> }
> }
>
> private void okButton_Click( object sender,[/color]
System.EventArg s e) //The[color=blue]
>basic event fired by clicking the button
> {
> OnOkClick(Event Args.Emtpy); //Try to fire the[/color]
event if someone is[color=blue]
>listening for it
> }
>
> private void cancelButton_Cl ick(object sender,[/color]
System.EventArg s e)[color=blue]
> {
> OnCancelClick(E ventArgs.Empty) ;
> }
>}
>
>In your main class you need to listen for the events[/color]
that the buttonclass[color=blue]
>fires. Unless you do this you will never know when a[/color]
button i pressed. So in[color=blue]
>your main class you need to do this
>
>ButtonClass bc01 = new ButtonClass();
>bc01.OkClick += new EventHandler(bc 01_OkClick); //Start[/color]
listening for ok[color=blue]
>button click in buttonclass bc01
>bc01.CancelCli ck += new EventHandler(bc 01_CancelClick) ;
>
>ButtonClass bc02 = new ButtonClass();
>bc02.OkClick += new EventHandler(bc 02_OkClick);
>bc02.CancelCli ck += new EventHandler(bc 02_CancelClick) ;
>And so on.
>
>Finally you need a method that handles the events that[/color]
has been fired[color=blue]
>
>private void bc01_OkClick(ob ject sender, EventArgs e)
>{
> //Do what you want to do if they press OK in bc01
>}
>
>This way you know exactly which ButtonControl is[/color]
throwing the event and[color=blue]
>which button in the control also.
>
>I hope this helps you out. Personally I got tired of[/color]
doing all these steps[color=blue]
>so I made a smal event generator that does this stuff[/color]
for me. Just copy and[color=blue]
>paste, which is quite nice and timesaving :)
>
>//Mikael
>
>
>
>"Thomas" <thomas_koller@ freesurf.ch> wrote in message
>news:0a9501c36 244$132adc20$a5 01280a@phx.gbl. ..[color=green]
>> Hi there
>>
>> I build a class "ButtonClas s" with two private
>> Buttons, "OK" And "Cancel".
>> Now, I would like to use this class in a Windowsform[/color][/color]
for[color=blue][color=green]
>> example three times.
>>
>> ButtonClass c1 = new ButtonClass();
>> ButtonClass c2 = new ButtonClass();
>> ButtonClass c3 = new ButtonClass();
>>
>> I assume the EventListener and its function is in the
>> ButtonClass. How do I know know which Button was[/color][/color]
pressed,[color=blue][color=green]
>> because I have just one Listener for each of the[/color][/color]
Buttons?[color=blue][color=green]
>>
>> Thanks for helping
>>
>> Thomas[/color]
>
>
>.
>[/color]

[Prateek]

Re: Event

Hi,

I maybe wrong here but from what I gather you have a class called
ButtonClass and this class implements the click event. Now, you have created
three ButtonClass objects and want to know which button was pressed in the
click event handler.. I assume you can use the this keyword in the
ButtonClass which will refer to the current object that raised the click
event...

Again, I may have made a mistake in understanding your query..

-Prateek

"Thomas" <thomas_koller@ freesurf.ch> wrote in message
news:0a9501c362 44$132adc20$a50 1280a@phx.gbl.. .
Hi there

I build a class "ButtonClas s" with two private
Buttons, "OK" And "Cancel".
Now, I would like to use this class in a Windowsform for
example three times.

ButtonClass c1 = new ButtonClass();
ButtonClass c2 = new ButtonClass();
ButtonClass c3 = new ButtonClass();

I assume the EventListener and its function is in the
ButtonClass. How do I know know which Button was pressed,
because I have just one Listener for each of the Buttons?

Thanks for helping

Thomas