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+// File#: _1_diagonal-movement
+// Usage: codyhouse.co/license
+/*
+ Modified version of the jQuery-menu-aim plugin
+ https://github.com/kamens/jQuery-menu-aim
+ - Replaced jQuery with Vanilla JS
+ - Minor changes
+*/
+(function() {
+ var menuAim = function(opts) {
+ init(opts);
+ };
+
+ window.menuAim = menuAim;
+
+ function init(opts) {
+ var activeRow = null,
+ mouseLocs = [],
+ lastDelayLoc = null,
+ timeoutId = null,
+ options = Util.extend({
+ menu: '',
+ rows: false, //if false, get direct children - otherwise pass nodes list
+ submenuSelector: "*",
+ submenuDirection: "right",
+ tolerance: 75, // bigger = more forgivey when entering submenu
+ enter: function(){},
+ exit: function(){},
+ activate: function(){},
+ deactivate: function(){},
+ exitMenu: function(){}
+ }, opts),
+ menu = options.menu;
+
+ var MOUSE_LOCS_TRACKED = 3, // number of past mouse locations to track
+ DELAY = 300; // ms delay when user appears to be entering submenu
+
+ /**
+ * Keep track of the last few locations of the mouse.
+ */
+ var mouseMoveFallback = function(event) {
+ (!window.requestAnimationFrame) ? mousemoveDocument(event) : window.requestAnimationFrame(function(){mousemoveDocument(event);});
+ };
+
+ var mousemoveDocument = function(e) {
+ mouseLocs.push({x: e.pageX, y: e.pageY});
+
+ if (mouseLocs.length > MOUSE_LOCS_TRACKED) {
+ mouseLocs.shift();
+ }
+ };
+
+ /**
+ * Cancel possible row activations when leaving the menu entirely
+ */
+ var mouseleaveMenu = function() {
+ if (timeoutId) {
+ clearTimeout(timeoutId);
+ }
+
+ // If exitMenu is supplied and returns true, deactivate the
+ // currently active row on menu exit.
+ if (options.exitMenu(this)) {
+ if (activeRow) {
+ options.deactivate(activeRow);
+ }
+
+ activeRow = null;
+ }
+ };
+
+ /**
+ * Trigger a possible row activation whenever entering a new row.
+ */
+ var mouseenterRow = function() {
+ if (timeoutId) {
+ // Cancel any previous activation delays
+ clearTimeout(timeoutId);
+ }
+
+ options.enter(this);
+ possiblyActivate(this);
+ },
+ mouseleaveRow = function() {
+ options.exit(this);
+ };
+
+ /*
+ * Immediately activate a row if the user clicks on it.
+ */
+ var clickRow = function() {
+ activate(this);
+ };
+
+ /**
+ * Activate a menu row.
+ */
+ var activate = function(row) {
+ if (row == activeRow) {
+ return;
+ }
+
+ if (activeRow) {
+ options.deactivate(activeRow);
+ }
+
+ options.activate(row);
+ activeRow = row;
+ };
+
+ /**
+ * Possibly activate a menu row. If mouse movement indicates that we
+ * shouldn't activate yet because user may be trying to enter
+ * a submenu's content, then delay and check again later.
+ */
+ var possiblyActivate = function(row) {
+ var delay = activationDelay();
+
+ if (delay) {
+ timeoutId = setTimeout(function() {
+ possiblyActivate(row);
+ }, delay);
+ } else {
+ activate(row);
+ }
+ };
+
+ /**
+ * Return the amount of time that should be used as a delay before the
+ * currently hovered row is activated.
+ *
+ * Returns 0 if the activation should happen immediately. Otherwise,
+ * returns the number of milliseconds that should be delayed before
+ * checking again to see if the row should be activated.
+ */
+ var activationDelay = function() {
+ if (!activeRow || !Util.is(activeRow, options.submenuSelector)) {
+ // If there is no other submenu row already active, then
+ // go ahead and activate immediately.
+ return 0;
+ }
+
+ function getOffset(element) {
+ var rect = element.getBoundingClientRect();
+ return { top: rect.top + window.pageYOffset, left: rect.left + window.pageXOffset };
+ };
+
+ var offset = getOffset(menu),
+ upperLeft = {
+ x: offset.left,
+ y: offset.top - options.tolerance
+ },
+ upperRight = {
+ x: offset.left + menu.offsetWidth,
+ y: upperLeft.y
+ },
+ lowerLeft = {
+ x: offset.left,
+ y: offset.top + menu.offsetHeight + options.tolerance
+ },
+ lowerRight = {
+ x: offset.left + menu.offsetWidth,
+ y: lowerLeft.y
+ },
+ loc = mouseLocs[mouseLocs.length - 1],
+ prevLoc = mouseLocs[0];
+
+ if (!loc) {
+ return 0;
+ }
+
+ if (!prevLoc) {
+ prevLoc = loc;
+ }
+
+ if (prevLoc.x < offset.left || prevLoc.x > lowerRight.x || prevLoc.y < offset.top || prevLoc.y > lowerRight.y) {
+ // If the previous mouse location was outside of the entire
+ // menu's bounds, immediately activate.
+ return 0;
+ }
+
+ if (lastDelayLoc && loc.x == lastDelayLoc.x && loc.y == lastDelayLoc.y) {
+ // If the mouse hasn't moved since the last time we checked
+ // for activation status, immediately activate.
+ return 0;
+ }
+
+ // Detect if the user is moving towards the currently activated
+ // submenu.
+ //
+ // If the mouse is heading relatively clearly towards
+ // the submenu's content, we should wait and give the user more
+ // time before activating a new row. If the mouse is heading
+ // elsewhere, we can immediately activate a new row.
+ //
+ // We detect this by calculating the slope formed between the
+ // current mouse location and the upper/lower right points of
+ // the menu. We do the same for the previous mouse location.
+ // If the current mouse location's slopes are
+ // increasing/decreasing appropriately compared to the
+ // previous's, we know the user is moving toward the submenu.
+ //
+ // Note that since the y-axis increases as the cursor moves
+ // down the screen, we are looking for the slope between the
+ // cursor and the upper right corner to decrease over time, not
+ // increase (somewhat counterintuitively).
+ function slope(a, b) {
+ return (b.y - a.y) / (b.x - a.x);
+ };
+
+ var decreasingCorner = upperRight,
+ increasingCorner = lowerRight;
+
+ // Our expectations for decreasing or increasing slope values
+ // depends on which direction the submenu opens relative to the
+ // main menu. By default, if the menu opens on the right, we
+ // expect the slope between the cursor and the upper right
+ // corner to decrease over time, as explained above. If the
+ // submenu opens in a different direction, we change our slope
+ // expectations.
+ if (options.submenuDirection == "left") {
+ decreasingCorner = lowerLeft;
+ increasingCorner = upperLeft;
+ } else if (options.submenuDirection == "below") {
+ decreasingCorner = lowerRight;
+ increasingCorner = lowerLeft;
+ } else if (options.submenuDirection == "above") {
+ decreasingCorner = upperLeft;
+ increasingCorner = upperRight;
+ }
+
+ var decreasingSlope = slope(loc, decreasingCorner),
+ increasingSlope = slope(loc, increasingCorner),
+ prevDecreasingSlope = slope(prevLoc, decreasingCorner),
+ prevIncreasingSlope = slope(prevLoc, increasingCorner);
+
+ if (decreasingSlope < prevDecreasingSlope && increasingSlope > prevIncreasingSlope) {
+ // Mouse is moving from previous location towards the
+ // currently activated submenu. Delay before activating a
+ // new menu row, because user may be moving into submenu.
+ lastDelayLoc = loc;
+ return DELAY;
+ }
+
+ lastDelayLoc = null;
+ return 0;
+ };
+
+ var reset = function(triggerDeactivate) {
+ if (timeoutId) {
+ clearTimeout(timeoutId);
+ }
+
+ if (activeRow && triggerDeactivate) {
+ options.deactivate(activeRow);
+ }
+
+ activeRow = null;
+ };
+
+ var destroyInstance = function() {
+ menu.removeEventListener('mouseleave', mouseleaveMenu);
+ document.removeEventListener('mousemove', mouseMoveFallback);
+ if(rows.length > 0) {
+ for(var i = 0; i < rows.length; i++) {
+ rows[i].removeEventListener('mouseenter', mouseenterRow);
+ rows[i].removeEventListener('mouseleave', mouseleaveRow);
+ rows[i].removeEventListener('click', clickRow);
+ }
+ }
+
+ };
+
+ /**
+ * Hook up initial menu events
+ */
+ menu.addEventListener('mouseleave', mouseleaveMenu);
+ var rows = (options.rows) ? options.rows : menu.children;
+ if(rows.length > 0) {
+ for(var i = 0; i < rows.length; i++) {(function(i){
+ rows[i].addEventListener('mouseenter', mouseenterRow);
+ rows[i].addEventListener('mouseleave', mouseleaveRow);
+ rows[i].addEventListener('click', clickRow);
+ })(i);}
+ }
+
+ document.addEventListener('mousemove', mouseMoveFallback);
+
+ /* Reset/destroy menu */
+ menu.addEventListener('reset', function(event){
+ reset(event.detail);
+ });
+ menu.addEventListener('destroy', destroyInstance);
+ };
+}());
+