[Solved] OO programming and B4W, passing "this" to a manifold callback function
31 December 2015 02:22
Hi,
I don't know if it is the good way, but I am trying to encapsulate some B4W code inside a JS object that I am going to instantiate later.
This object has some properties reflecting its state and some B4W properties and API functions to get a related blender object and bind some sensors to it.
Unfortunately, in the callback function this.prop1 cannot be accessed, and the result is undefined if you click on the object in the 3D scene. Is there a workaround to get the context of "this" instance so that we can r/w the properties of the instance and use its methods in the callback function ?
I don't know if it is the good way, but I am trying to encapsulate some B4W code inside a JS object that I am going to instantiate later.
This object has some properties reflecting its state and some B4W properties and API functions to get a related blender object and bind some sensors to it.
function ModelOBJ() {
// some props
this.prop1 = true;
this.prop2 = 0 ;
...
// some classic JS methods
this.func = function(){
...
}
// some B4W code
this.b4w_obj = m_scs.get_object_by_name('a_blender_obj');
this.b4w_selector = m_ctl.create_selection_sensor(this.b4w_obj)
this.b4w_obj_cb = function (obj, id, pulse){
console.log(this.prop1);
}
m_ctl.create_sensor_manifold(this.b4w_obj, "OK", m_ctl.CT_SHOT,[this.b4w_selector], function(s){return s[0]}, this.b4w_obj_cb);
}
var object1 = new ModelOBJ();
Unfortunately, in the callback function this.prop1 cannot be accessed, and the result is undefined if you click on the object in the 3D scene. Is there a workaround to get the context of "this" instance so that we can r/w the properties of the instance and use its methods in the callback function ?
03 January 2016 05:51
Well, after some substantial searching on the net, the answer was relatively simple. At least, it works rather well right now for my project. I don't know if there are better ways to do that and hope it won't lead to any potential problems, but adding "bind(this)" to the callback function did the trick.
(end of noob alert)
this.b4w_obj_cb = function (obj, id, pulse){
console.log(this.prop1);
}.bind(this);
(end of noob alert)
