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Diffstat (limited to 'old-apps/projects/src/app/pages/nav/js/_1_diagonal-movement.js')
| -rw-r--r-- | old-apps/projects/src/app/pages/nav/js/_1_diagonal-movement.js | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/old-apps/projects/src/app/pages/nav/js/_1_diagonal-movement.js b/old-apps/projects/src/app/pages/nav/js/_1_diagonal-movement.js new file mode 100644 index 0000000..ed4a47d --- /dev/null +++ b/old-apps/projects/src/app/pages/nav/js/_1_diagonal-movement.js @@ -0,0 +1,296 @@ +// 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); + }; +}()); + |
