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Mivhak.component('vertical-scrollbar', { |
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template: '<div class="mivhak-scrollbar mivhak-v-scrollbar"><div class="mivhak-scrollbar-thumb"></div></div>', |
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props: { |
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editor: null, |
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$inner: null, |
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$outer: null, |
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mivhakInstance: null, |
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minHeight: 50, |
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state: { |
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a: 0, // The total height of the editor |
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b: 0, // The height of the viewport, excluding padding |
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c: 0, // The height of the viewport, including padding |
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d: 0, // The calculated thumb height |
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t: 0 // The current top offset of the viewport |
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}, |
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initialized: false |
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}, |
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methods: { |
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initialize: function() { |
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if(!this.initialized) |
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{ |
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this.initialized = true; |
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this.dragDealer(); |
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var $this = this; |
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this.$inner.on('mousewheel', function(e){$this.onScroll.call(this, e);}); |
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$(window).resize(function(){ |
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if($this.mivhakInstance.state.lineWrap) |
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$this.refresh(); |
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}); |
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} |
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// Refresh anytime initialize is called |
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this.refresh(); |
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}, |
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updateState: function() { |
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var oldState = $.extend({}, this.state); |
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this.state.a = getEditorHeight(this.$inner); |
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this.state.b = this.mivhakInstance.state.height; |
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this.state.c = this.mivhakInstance.state.height-this.mivhakInstance.options.padding*2; |
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this.state.d = Math.max(this.state.c*this.state.b/this.state.a,this.minHeight); |
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this.state.t *= this.state.a/Math.max(oldState.a,1); // Math.max used to prevent division by zero |
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return this.state.a !== oldState.a || this.state.b !== oldState.b; |
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}, |
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refresh: function() { |
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var $this = this, oldTop = this.state.t; |
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raf(function(){ |
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if($this.updateState()) |
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{ |
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if($this.getDifference() > 0) |
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{ |
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$this.doScroll('up',oldTop-$this.state.t); |
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$this.$el.css({height: $this.state.d + 'px', top: 0}); |
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$this.moveBar(); |
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} |
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else |
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{ |
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$this.doScroll('up',$this.state.t); |
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$this.$el.css({height: 0}); |
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} |
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} |
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}); |
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}, |
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onScroll: function(e) { |
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var didScroll; |
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if(e.deltaY > 0) |
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didScroll = this.doScroll('up',e.deltaY*e.deltaFactor); |
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else |
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didScroll = this.doScroll('down',-e.deltaY*e.deltaFactor); |
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if(0 !== didScroll) { |
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this.moveBar(); |
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e.preventDefault(); // Only prevent page scroll if the editor can be scrolled |
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} |
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}, |
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dragDealer: function(){ |
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var $this = this, |
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lastPageY; |
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this.$el.on('mousedown.drag', function(e) { |
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lastPageY = e.pageY; |
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$this.$el.add(document.body).addClass('mivhak-scrollbar-grabbed'); |
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$(document).on('mousemove.drag', drag).on('mouseup.drag', stop); |
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return false; |
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}); |
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function drag(e){ |
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var delta = e.pageY - lastPageY, |
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didScroll; |
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// Bail if the mouse hasn't moved |
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if(!delta) return; |
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lastPageY = e.pageY; |
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raf(function(){ |
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didScroll = $this.doScroll(delta > 0 ? 'down' : 'up', Math.abs(delta*getEditorHeight($this.$inner)/$this.$outer.parent().height())); |
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if(0 !== didScroll) $this.moveBar(); |
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}); |
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} |
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function stop() { |
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$this.$el.add(document.body).removeClass('mivhak-scrollbar-grabbed'); |
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$(document).off("mousemove.drag mouseup.drag"); |
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} |
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}, |
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moveBar: function() { |
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this.$el.css({ |
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top: (this.state.b-this.state.d)/(this.state.a-this.state.c)*this.state.t + 'px' |
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}); |
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}, |
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/** |
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* Scrolls the editor element in the direction given, provided that there |
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* is remaining scroll space |
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* @param {string} dir |
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* @param {int} delta |
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*/ |
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doScroll: function(dir, delta) { |
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var s = this.state, |
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remaining, |
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didScroll; |
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if('up' === dir) |
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{ |
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remaining = s.t; |
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didScroll = remaining > 0 ? Math.min(remaining,delta) : 0; |
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s.t -= didScroll; |
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} |
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if('down' === dir) |
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{ |
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remaining = this.getDifference() - s.t; |
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didScroll = remaining > 0 ? Math.min(remaining,delta) : 0; |
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s.t += didScroll; |
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} |
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this.$inner.css({top: -s.t}); |
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return didScroll; |
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}, |
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/** |
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* Returns the difference between the containing div and the editor div |
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*/ |
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getDifference: function() |
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{ |
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return this.state.a - this.state.c; |
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} |
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} |
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}); |
askupasoftware /
mivhak.js
