Page Navigation

/**
 *  Page Navigation
 *
 *  Author: steve
 *  Date: 2013-08-23
 */
 
preferences {
	page(name:"A", title:"A", content:"A", params:["foo":1])
	page(name:"B", title:"B", content:"B", params:["foo":1])
	page(name:"C", title:"C", content:"C", params:["foo":1])
	page(name:"D", title:"D", content:"D", params:["foo":1])
	page(name:"E", title:"E", content:"E", params:["foo":1])
}

def A(params) {

	log.debug "params: ${params}"
	log.debug "state: ${state}"

	int foo = params.foo ?: 0
	params.foo = foo + 1
    
    int a = state.a ? state.a as int : 0
    a++
    state.a = a
    
	dynamicPage(name:"A", title:"A", nextPage:"B", params:params) {
    	section ("This is A")
    	section ("Next: B")
    	section ("Previous: null")
        section ("params.foo = ${params.foo}")
        section ("state.a = ${a}")
    }
}

def B(params) {

	log.debug "params: ${params}"
	log.debug "state: ${state}"

	int foo = params.foo ?: 0
	params.foo = foo + 1
    
    int b = state.b ? state.b as int : 0
    state.b = b + 1
    
	dynamicPage(name:"B", title:"B", nextPage:"C", params:params){
    	section ("This is B")
    	section ("Next: C")
    	section ("Previous: null")
        section ("params.foo = ${params.foo}")
        section ("state.b = ${state.b}")
    }
}

def C(params) {

	log.debug "params: ${params}"
	log.debug "state: ${state}"

	int foo = params.foo ?: 0
	params.foo = foo + 1
    
    int c = state.c ? state.c as int : 0
    state.c = c + 1
    
	dynamicPage(name:"C", title:"C", nextPage:"D", previousPage:"E", params:params){
    	section ("This is C")
    	section ("Next: D")
    	section ("Previous: E")
        section ("params.foo = ${params.foo}")
        section ("state.c = ${state.c}")
    }
}

def D(params) {

	log.debug "params: ${params}"
	log.debug "state: ${state}"

	int foo = params.foo ?: 0
	params.foo = foo + 1
    
    int d = state.d ? state.d as int : 0
    d++
    state.d = d
    
	def installable = d > 5
    
	dynamicPage(name:"D", title:"D", previousPage:"B", params:params, install:installable){
    	section ("This is D")
    	section ("Next: null")
    	section ("Previous: B")
        section ("params.foo = ${params.foo}")
        section ("state.d = ${state.d}")
    }
}

def E(params) {

	log.debug "params: ${params}"
	log.debug "state: ${state}"

	int foo = params.foo ?: 0
	params.foo = foo + 1
    
    int e = state.e ? state.e as int : 0
    e++
    state.e = e
    
	dynamicPage(name:"E", title:"E", previousPage:"B", nextPage:"D"){
    	section ("This is E")
    	section ("Next: D")
    	section ("Previous: C")
        section ("params.foo = ${params.foo}")
        section ("state.e = ${state.e}")
    }
}

def installed() {
	log.debug "Installed with settings: ${settings}"

	initialize()
}

def updated() {
	log.debug "Updated with settings: ${settings}"

	unsubscribe()
	initialize()
}

def initialize() {
	// TODO: subscribe to attributes, devices, locations, etc.
}