OF iOS passing TouchDown variables touch.x and touch.y into a class

beginners
#1

Hi
At the moment I have written a bunch of Button classes for iOS use.
My Button class has a TouchDown,TouchUp method which I then call in the TestApp like this:

  
  
#include "testApp.h"  
  
//--------------------------------------------------------------  
void testApp::setup(){	  
	// initialize the accelerometer  
	ofxAccelerometer.setup();  
	  
	//If you want a landscape oreintation   
	//iPhoneSetOrientation(OFXIPHONE_ORIENTATION_LANDSCAPE_RIGHT);  
	  
	ofBackground(127,127,127);  
   mygButton =gButton(20, 20, 80);  
}  
  
//--------------------------------------------------------------  
void testApp::update(){  
  
}  
//--------------------------------------------------------------  
void testApp::draw(){  
	mygButton.draw();  
}  
  
//--------------------------------------------------------------  
void testApp::exit(){  
  
}  
  
//--------------------------------------------------------------  
void testApp::touchDown(ofTouchEventArgs & touch){  
   mygButton.touchDown(touch.x, touch.y);    
}  
  
//--------------------------------------------------------------  
void testApp::touchMoved(ofTouchEventArgs & touch){  
   mygButton.touchDown(touch.x, touch.y);  
}  
  
//--------------------------------------------------------------  
void testApp::touchUp(ofTouchEventArgs & touch){  
    mygButton.touchUp(touch.x, touch.y);  
}

As I am always going to want to use the .touchDown and touchUp methods for every mygButton that I create is there a way to parse the touch events into my button class so I can just instanstiate a mygbutton and then call mygbutton.draw without having to call the touchdown and touch up methods by writing them into the relavent sections in the testApp.mm

Here is my gButton .cpp

  
  
  
#include "gButton.h"  
  
  
gButton::gButton()  
{  
      
}  
  
gButton::gButton(int _x, int _y, int _size)  
{  
    x=_x;  
    y=_y;  
    height= _size;  
    width= _size;  
    has_switched = false;  
}  
  
gButton::gButton(int _x, int _y, int _height, int _width)  
{  
    x=_x;  
    y=_y;  
    height = _height;  
    width =_width;  
    has_switched = false;  
}  
//----------------------------------------------------------  
  
void gButton::draw()  
{  
      
    if (button_state==0) {  
        ofSetColor(100, 0, 100);   // color for state one  
    } else ofSetColor(0, 100, 0);  // color for state two  
      
	ofRect(x, y, width, height);   // what our button will look like i.e. a rectangle  
      
}  
//----------------------------------------------------------  
void gButton::touchDown(float _xPos,float _yPos)  
{  
    xPos=_xPos;  
    yPos=_yPos;  
    //cout<<"x="<<x<<endl;  
  
    if (has_switched) {  
        return;  
    }  
      
    if (xPos>x&&xPos<x+width&&yPos>y&&yPos<y+height) {   // check bounds  
        button_state = !button_state;  
         
        has_switched = true;  
    }  
    cout<<"button state="<<button_state<<endl;  
}  
//----------------------------------------------------------  
void gButton::touchUp(float _xPos, float _yPos) {  
  
    //reset all the buttons...   
    has_switched = false;      
}

I am not trying to do this out of lazyness just curious to see if there is a better way to embed the touch functions that I will always be using into my button class.
I am obviously a beginner to open frameworks and C++ any guidance appreciated
Thanks
GEoff

#2

You could register touch events in your button class-

  
  
// setup inside your gButton constructor  
ofRegisterTouchEvents(this);  
  
// then add the touch events to gButton same as they are in testApp  
void gButton::touchDown(ofTouchEventArgs &touch){ }  
void gButton::touchMoved(ofTouchEventArgs &touch){ }  
void gButton::touchUp(ofTouchEventArgs &touch){ }  
void gButton::touchDoubleTap(ofTouchEventArgs &touch){ }  
void gButton::touchCancelled(ofTouchEventArgs &touch){ }