Making a custom Event

[sakanac...@gmail.com]

I'm a bit confused on how to make a custom event.

To put it shortly I want to make an event for a class i made.
I'm putting instances of the class in a Gridlayout.
The class is basically a representation of bricks. Each instance is a brick.
I want a collision between my character and the bricks to cause the bricks to break.

But it's impossible to directly access each and every child widget(brick) inside the GridLayout.

So I figured that if I make an event. Then I can bind it to my "brick breaking" function.

I could apply this rule to every instance using KV language,

But I have no idea about how to make events.....
Things like EventDispatcher confuse me

Thanks for any help

[ZenCODE]

Hi there

Try looking here?

http://kivy.org/docs/api-kivy.event.html

See the "register_event_type()" section. Then use the "dispatch()" to trigger it....

Hope that helps?

Peace out

[mathieu....@gmail.com]

I think I had the same problem wich I resolve this way.

First a little explanation of what i had and what i did.

I had several custom widgets into cells of a GridLayout, and bind the 'on_touch_down' to those widgets.
When I touch one the the widget, the event is fired x times ( x = number of instances of the widget ).
I expected the event to be sent only to the widget I touch.

So to get the correct widget at the 'on_touch_down' method, I used
    if self.collide_point ( touch.x, touch.y) :
            #filter to the touchded instance#
            my code. .......

I think your doing a "ball breaker" game ? Maybe you have a clock to move the ball like in the Pong tutorial ? if so, maybe you can check the collision at the ball moving function ?
In the widget class you have a collide_widget method explained here :
http://kivy.org/docs/api-kivy.uix.widget.html?highlight=collide_widget#kivy.uix.widget.Widget.collide_widget

I hope I understand what you where asking for, I post my experience here to get this answer :
why, in my case, the on_touch_down event is call as many times as instances of my widget ?

cheers.
Mathieu

[sakanac...@gmail.com]

Thank you, it worked!

I had the movement going with a clock, so I also decided to also let it check for collisions in my "Update" function
Works perfectly now thanks

I had it typed out like this:

 def update(self,dt):

        self.char.move()

        if self.theX==1:

            self.theY=self.theY-1

            

        if self.theY==0:

            self.char.jirachi= "nin8new.png"

            self.char.width= 100

        

        for child in self.brickHolder.children[:]:

            if child.collide_widget(self.char):

                self.brickBreak()

                print "colli made"

[sakanac...@gmail.com]

One more question

Now that I've got it to collide and break the bricks

is it possible to put this in the form of an Event?

      for child in self.brickHolder.children[:]:

            if child.collide_widget(self.char):

                self.brickBreak()

                print "colli made"

Like, in my brickHolder class

    class brickHolder

    self.register_event_type('on_contact')

    def on_contact(self):
        -When an object touches self......self.dispatch()
    

    .......later on in program

    if Event dispatched= on_contact........ self.brickBreak()

[Mathieu Virbel]

Hi,

All the widgets are based in top of EventDispatcher.

So you can "declare" events like this:

class MyCustomWidget(GridLayout):

    __events__ = ('on_brick_breacked', )

    def on_brick_breacked(self, instance, *args):

        pass

Then, you just need to call "self.dispatch('on_brick_breacked', ...)" somewhere in your widget :)

Mathieu

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