From 5c87d98c0b3383c7ad63f0b69e36110b915e36c2 Mon Sep 17 00:00:00 2001
From: Robert Zorko <robertz@gurucue.com>
Date: Tue, 22 Sep 2015 18:13:31 +0200
Subject: enabled buttons in the navigation header (at least buttons on the
 left side of the bar), renamed stateMachine to navigation

---
 js/codeq/navigation.js | 104 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 js/codeq/navigation.js

(limited to 'js/codeq/navigation.js')

diff --git a/js/codeq/navigation.js b/js/codeq/navigation.js
new file mode 100644
index 0000000..4445a3d
--- /dev/null
+++ b/js/codeq/navigation.js
@@ -0,0 +1,104 @@
+/**
+ * Created by robert on 9/15/15.
+ */
+(function() {
+    codeq.makeStateMachine = function (def) {
+        var currState = null;
+        return {
+            'transition': function (name) {
+                var newState = def[name];
+                if (!newState) {
+                    codeq.log.error('Cannot transition to state ' + name + ': it is not defined');
+                    return;
+                }
+                if (newState === currState) {
+                    codeq.log.info('Will not transition between identical states: ' + name);
+                    return;
+                }
+                if (currState !== null) currState.exit();
+                currState = newState;
+                currState.enter.apply(currState, Array.prototype.slice.apply(arguments, [1]));
+            },
+            'destroy': function () {
+                if (currState !== null) currState.exit();
+                currState = null;
+            },
+            'register': function (name, state) {
+                if (name in def) codeq.log.error('The state ' + name + ' is already registered, overriding');
+                def[name] = state;
+            }
+        }
+    };
+
+
+    //the global state machine is a bit different - so it'll be implemented here
+    var makeGlobalStateMachine = function (def) {
+        var currState = null;
+        var stateChangeFun = function historyStateChangeHandler() {
+            var historyState = History.getState();
+            codeq.globalStateMachine.actualTransition.apply(codeq.globalStateMachine, $.merge([historyState.data.state] ,historyState.data.params));
+        };
+        History.Adapter.bind(window, 'statechange', stateChangeFun);
+        //prepare the history state change listener
+        return {
+            'transition': function (name) {
+                var newState = def[name];
+                if (!newState) {
+                    codeq.log.error('Cannot transition to state ' + name + ': it is not defined');
+                    return;
+                }
+                if (newState === currState) {
+                    codeq.log.info('Will not transition between identical states: ' + name);
+                    return;
+                }
+
+                if(History.getState().data.state === name) codeq.globalStateMachine.actualTransition.apply(codeq.globalStateMachine,Array.prototype.slice.apply(arguments, [0]));//special case which happens if the user refreshes while in the login screen (history state doesn't change because it goes from login to login and the above listener doesn't trigger)
+                try {
+                    History.pushState({'state': name, 'params': Array.prototype.slice.apply(arguments, [1])}, null, '?s=' + name);
+                }
+                catch (e) {
+                    codeq.log.error('init: History.pushState() failed for new state ' + name+'. Error:'+e);
+                }
+            },
+            'destroy': function () {
+                if (currState !== null) currState.exit();
+                currState = null;
+                History.Adapter.unbind(window, 'statechange', stateChangeFun);
+            },
+            'register': function (name, state) {
+                if (name in def) codeq.log.error('The state ' + name + ' is already registered, overriding');
+                def[name] = state;
+            },
+            'actualTransition': function (name) {
+                var newState = def[name];//if the newState is not the same as the old or if it doesn't exist at all is already checked at this point
+                if (currState) currState.exit();
+                currState = newState;
+                currState.enter.apply(currState, Array.prototype.slice.apply(arguments, [1]));
+            }
+        }
+    };
+    codeq.globalStateMachine = makeGlobalStateMachine({});
+
+
+    //setup all the buttons in the banner
+    $('#navigation-login').on('click', function(e){
+        codeq.globalStateMachine.transition('login');
+        e.preventDefault();//prevent this since we'll trigger a page reload otherwise
+    });
+    $('#navigation-language').on('click', function(e){
+        codeq.globalStateMachine.transition('language');
+        e.preventDefault();
+    });
+    $('#navigation-problem').on('click', function(e){
+        codeq.globalStateMachine.transition('problem');
+        e.preventDefault();
+    });
+    $('#navigation-python').on('click', function(e){
+        codeq.globalStateMachine.transition('python');
+        e.preventDefault();
+    });
+    $('#navigation-prolog').on('click', function(e){
+        codeq.globalStateMachine.transition('prolog');
+        e.preventDefault();
+    });
+})();
\ No newline at end of file
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