Side menu controller

hacking/SideMenuController.js

@@ -0,0 +1,180 @@
+(function(window, document, ionic) {
+
+  SideMenuController = function(options) {
+    var _this = this;
+
+
+    this.left = options.left;
+    this.right = options.right;
+    this.content = options.content;
+      
+    this._rightShowing = false;
+    this._leftShowing = false;
+
+    this.content.onDrag = function(e) {
+      _this._handleDrag(e);
+    };
+
+    this.content.endDrag = function(e) {
+      _this._endDrag(e);
+    };
+
+  };
+
+  SideMenuController.prototype = {
+    toggleLeft: function() {
+      var openAmount = this.getOpenAmount();
+      if(openAmount > 0) {
+        this.openPercentage(0);
+      } else {
+        this.openPercentage(100);
+      }
+    },
+    toggleRight: function() {
+      var openAmount = this.getOpenAmount();
+      if(openAmount < 0) {
+        this.openPercentage(0);
+      } else {
+        this.openPercentage(-100);
+      }
+    },
+    getOpenAmount: function() {
+      return this.content.getTranslateX() || 0;
+    },
+    getOpenRatio: function() {
+      var amount = this.getOpenAmount();
+      if(amount >= 0) {
+        return amount / this.left.width;
+      }
+      return amount / this.right.width;
+    },
+    getOpenPercentage: function() {
+      return this.getOpenRatio() * 100;
+    },
+    openPercentage: function(percentage) {
+      var p = percentage / 100;
+      var maxLeft = this.left.width;
+      var maxRight = this.right.width;
+      if(percentage >= 0) {
+        this.openAmount(maxLeft * p);
+      } else {
+        this.openAmount(maxRight * p);
+      }
+    },
+    openAmount: function(amount) {
+      var maxLeft = this.left.width;
+      var maxRight = this.right.width;
+
+      // Check if we can move to that side, depending if the left/right panel is enabled
+      if((!this.left.isEnabled && amount > 0) || (!this.right.isEnabled && amount < 0)) {
+        return;
+      }
+
+      if((this._leftShowing && amount > maxLeft) || (this._rightShowing && amount < -maxRight)) {
+        return;
+      }
+      
+      this.content.setTranslateX(amount);
+
+      if(amount >= 0) {
+        this._leftShowing = true;
+        this._rightShowing = false;
+
+        // Push the z-index of the right menu down
+        this.right.pushDown();
+        // Bring the z-index of the left menu up
+        this.left.bringUp();
+      } else {
+        this._rightShowing = true;
+        this._leftShowing = false;
+
+        // Bring the z-index of the right menu up
+        this.right.bringUp();
+        // Push the z-index of the left menu down
+        this.left.pushDown();
+      }
+    },
+    snapToRest: function(e) {
+      // We want to animate at the end of this
+      this.content.enableAnimation();
+      this._isDragging = false;
+
+      // Check how much the panel is open after the drag, and
+      // what the drag velocity is
+      var ratio = this.getOpenRatio();
+
+
+      if(ratio == 0)
+        return;
+
+      var velocityThreshold = 0.3;
+      var velocityX = e.gesture.velocityX
+      var direction = e.gesture.direction;
+
+      // Less than half, going left 
+      //if(ratio > 0 && ratio < 0.5 && direction == 'left' && velocityX < velocityThreshold) {
+      //this.openPercentage(0);
+      //}
+
+      var sign = ratio && ratio / Math.abs(ratio);
+
+      // Left panel, More than positive half, too slow
+      if((ratio > 0.5 || ratio < -0.5) && velocityX < velocityThreshold) {
+        this.openPercentage(sign * 100);
+      }
+      // Left or Right Panel, Less than +/- half, too slow
+      else if(ratio <= 0.5 && ratio >= -0.5 && velocityX < velocityThreshold) {
+        this.openPercentage(0);
+      }
+
+      // Left panel, Going left, quickly
+      else if(direction == 'left' && ratio >= 0 && velocityX >= velocityThreshold) {
+        this.openPercentage(0);
+      }
+
+      // Left panel, Going right, quickly
+      else if(direction == 'right' && ratio >= 0 && velocityX >= velocityThreshold) {
+        this.openPercentage(100);
+      }
+
+      // Right panel, Going left, quickly
+      else if(direction == 'left' && ratio <= 0 && velocityX >= velocityThreshold) {
+        this.openPercentage(-100);
+      }
+
+      // Right panel, Going right, quickly
+      else if(direction == 'right' && ratio <= 0 && velocityX >= velocityThreshold) {
+        this.openPercentage(0);
+      } else {
+        this.openPercentage(0);
+      }
+    },
+    _endDrag: function(e) {
+      this.snapToRest(e);
+    },
+    _initDrag: function(e) {
+      this.content.disableAnimation();
+      this._isDragging = true;
+      this._startX = 0;
+      this._offsetX = 0;
+      this._lastX = 0;
+    },
+    _handleDrag: function(e) {
+      if(!this._isDragging) {
+        this._initDrag(e);
+
+        this._startX = e.gesture.touches[0].pageX;
+        this._lastX = this._startX;
+
+        this._offsetX = this.getOpenAmount();
+      }
+      //console.log('Dragging page', this._startX, this._lastX, this._offsetX, e);
+      var newX = this._offsetX + (this._lastX - this._startX);
+
+      this.openAmount(newX);
+
+      this._lastX = e.gesture.touches[0].pageX;
+    }
+  };
+
+})(this, document, ion = this.ionic || {});