Re: [Vala] Access Clutter Script Actor in Event handler

[tomw <tomw ubilix com>]

Hi, 

if you want to pass user data to a signal handler you should connect the
signal in the code rather than by the script. The vala code may look
like this:  

using Clutter;
using GLib;

public bool button_press (Actor actor, Script ui) {   
   stdout.printf("button press event");
   Rectangle rect = (Rectangle)ui.get_object ("rectangle"); 
   rect.set_color(Color.from_string("white"));
   
   return true;
}

public bool key_pressed (KeyEvent event) {
        stdout.printf ("Key pressed : %d \n", event.hardware_keycode);
        Clutter.main_quit ();
        
        return true;
        
        }

int main (string[] args) {
   
  //Stage stage = Stage.get_default();
  string filename = "gui_test.json";
  
  if (Clutter.init(ref args) != Clutter.InitError.SUCCESS) {
    stdout.printf("Error Initializing Clutter");
    return 1;
  }

  Script ui = new Script();
  uint merge_id = ui.load_from_file (filename);
  if (merge_id == 0)
    {
       stdout.printf("%s", "Error Loading ClutterScript");
       return 1;
    }

  //ui.connect_signals (null);

  Stage stage = (Stage)ui.get_object ("stage");
  stage.button_press_event.connect (() => {button_press (stage, ui);
return true;}); 
  stage.key_press_event.connect (key_pressed);
  stage.show_all();
  Clutter.main();
  return 0;
}


and the json-file (slightly simpler) like this:

[
  {
    "id" : "stage",
    "type" : "ClutterStage",
    "width" : 300,
    "height" : 300,
    "color" : "#335",
    "signals" : [
        { "name" : "hide", "handler" : "clutter_main_quit" }
    ],
    "children" : [ 
        {
                "id" : "rectangle",
                "type" : "ClutterRectangle",
                "width" : 200,
                "height" : 200,
                "x" : 50,
                "y" : 50,
                "color" : "#a90",
                "rotation-center-z-gravity" : "center",
                "reactive" : true
        }

    ]
  }
]




On Mi, 2012-01-25 at 16:55 -0500, Brian Duffy wrote:
> using Clutter;
> using GLib;
>
>
> bool button_press (ButtonEvent event, Script ui) {   // wrong
>    stdout.printf("%s", "button press event");
>    Rectangle rect = (Rectangle)ui.get_object ("rectangle");  // this
> segfaults
>    //rect.set_color(Color.from_string("white"));
>    return true;
> }
>
>
> int main (string[] args) {
>
>   //Stage stage = Stage.get_default();
>   string filename = "gui_test.json";
>
>   if (Clutter.init(ref args) != Clutter.InitError.SUCCESS) {
>     stdout.printf("%s", "Error Initializing Clutter");
>     return 1;
>   }
>
>   Script ui = new Script();
>   uint merge_id = ui.load_from_file (filename);
>   if (merge_id == 0)
>     {
>        stdout.printf("%s", "Error Loading ClutterScript");
>        return 1;
>     }
>
>   ui.connect_signals (ui);
>
>   Stage stage = (Stage)ui.get_object ("stage");
>   /* make the objects in the script available to all signals
>    * by passing the script as the second argument
>    * to clutter_script_connect_signals()
>    */
>
>   stage.show_all();
>
>   Clutter.main();
>
>   return 0;
> }