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Mivhak.component('horizontal-scrollbar', { |
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template: '<div class="mivhak-scrollbar mivhak-h-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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minWidth: 50, |
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state: { |
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a: 0, // The total width of the editor |
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b: 0, // The width of the viewport, excluding padding |
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c: 0, // The width of the viewport, including padding |
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d: 0, // The calculated width of the thumb |
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l: 0 // The current left 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 $this = this; |
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$(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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this.refresh(); |
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}, |
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updateState: function() { |
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var oldState = $.extend({}, this.state); |
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this.state.a = this.getEditorWidth(); |
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this.state.b = this.$outer.parent().width(); |
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this.state.c = this.state.b - this.mivhakInstance.options.padding*2; |
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this.state.d = Math.max(this.state.c*this.state.b/this.state.a,this.minWidth); |
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this.state.l *= 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 $this = this, oldLeft = this.state.l; |
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raf(function(){ |
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if($this.updateState()) |
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{ |
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if($this.getDifference() > 0) |
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{ |
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$this.doScroll('left',oldLeft-$this.state.l); |
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$this.$el.css({width: $this.state.d + 'px', left: 0}); |
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$this.moveBar(); |
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} |
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else |
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{ |
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$this.doScroll('left',$this.state.l); |
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$this.$el.css({width: 0}); |
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} |
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} |
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}); |
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}, |
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dragDealer: function(){ |
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var $this = this, |
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lastPageX; |
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this.$el.on('mousedown.drag', function(e) { |
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lastPageX = e.pageX; |
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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.pageX - lastPageX, |
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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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lastPageX = e.pageX; |
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raf(function(){ |
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didScroll = $this.doScroll(delta > 0 ? 'right' : 'left', Math.abs(delta*$this.getEditorWidth()/$this.$outer.parent().width())); |
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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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left: (this.state.b-this.state.d)/(this.state.a-this.state.c)*this.state.l + '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('left' === dir) |
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{ |
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remaining = s.l; |
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didScroll = remaining > 0 ? Math.min(remaining,delta) : 0; |
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s.l -= didScroll; |
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} |
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if('right' === dir) |
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{ |
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remaining = this.getDifference() - s.l; |
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didScroll = remaining > 0 ? Math.min(remaining,delta) : 0; |
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s.l += didScroll; |
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} |
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this.$inner.find('.ace_content').css({'margin-left': -s.l}); |
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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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* Calculate the editor's width based on the number of lines |
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*/ |
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getEditorWidth: function() { |
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return this.$inner.find('.ace_content').width(); |
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} |
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} |
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}); |
askupasoftware /
mivhak.js
