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/* <copyright>
This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
(c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved.
</copyright> */
var Montage = require("montage/core/core").Montage,
Component = require("montage/ui/component").Component;
exports.RuleList = Montage.create(Component, {
focusDelegate : { value: null },
ruleNodeName : { value: 'li' },
_needsScrollToBottom: { value: null },
childComponents : {
value: [],
distinct: true
},
rulesToDraw : {
value: [],
distinct: true
},
rulesToRemove : {
value: [],
distinct: true
},
update : {
value: function(rules) {
this.childComponents.forEach(function(component) {
component.update();
}, this);
}
},
_rules: { value: null },
rules: {
get: function() {
return this._rules;
},
set: function(list) {
if(!list) {
return null;
}
var foundIndices = [];
//// Iterate existing rules, update those which rule exists in new
//// rule list
this.childComponents.forEach(function(ruleComponent, i, drawnRules) {
//// If rule exists in new list, update it
var index = list.indexOf(ruleComponent.rule);
if(ruleComponent.rule.type === 'inline') {
//// Let's emulate finding the line rule at the first index
index = 0;
}
if(index !== -1) {
// found rule in our component list, or it's the inline rule
ruleComponent.update();
foundIndices.push(index);
} else if(!rule.applied) { /// remove rule (unless unapplied)
this.rulesToRemove.push(ruleComponent);
}
}, this);
//// Find rules to add
list.forEach(function(rule, index) {
//// If we haven't updated the rule already,
//// we're dealing with a new rule to add
if(foundIndices.indexOf(index) === -1) {
this.addRule(rule, index);
}
}, this);
this._rules = list;
this.needsDraw = true;
}
},
addRule: {
value: function(rule, atIndex, applies, drawCallback) {
var insertIndex = atIndex || this.childComponents.length;
this.rulesToDraw.push({
rule: rule,
index: insertIndex,
instance : null,
applies : applies,
callback : drawCallback
});
this.needsDraw = true;
}
},
removeRule: {
value: function(ruleComponent) {
this.rulesToRemove.push(ruleComponent);
this.needsDraw = true;
}
},
willDraw : {
value: function() {
this.rulesToDraw.forEach(function(ruleObj) {
var el = document.createElement(this.ruleNodeName);
var componentBase = this.supportedRules[ruleObj.rule.type],
instance;
///// Draw the rule if we have a template for the rule type
if(!componentBase) { return false; }
instance = Montage.create(componentBase);
instance.element = document.createElement(this.ruleNodeName);
instance.rule = ruleObj.rule;
instance.applied = ruleObj.applies;
if(this.focusDelegate) {
instance.focusDelegate = this.focusDelegate;
}
ruleObj.instance = instance;
}, this);
}
},
draw : {
value: function() {
///// If needed, scroll to bottom
if(this._needsScrollToBottom) {
///// Make sure the appended rule item is visible (scrolled-to)
this.element.scrollTop = this.element.offsetHeight;
console.log("Scroll top:", this.element.scrollTop);
this._needsScrollToBottom = false;
}
//// Iterate through all rules needing removal
console.log("Rule List :: Rules to draw:,", this.rulesToDraw.length);
this.rulesToRemove.forEach(function(ruleComponent) {
var componentIndex = this.childComponents.indexOf(ruleComponent);
this.childComponents.splice(componentIndex, 1);
this.element.removeChild(ruleComponent.element);
}, this);
//// Iterate through all rules that need draw and append them
this.rulesToDraw.forEach(function(ruleObj) {
var ruleAtIndex = this.childComponents[ruleObj.index];
if(ruleAtIndex) {
//// Insert rule at appropriate index
this.element.insertBefore(ruleObj.instance.element, ruleAtIndex.element);
} else {
this.element.appendChild(ruleObj.instance.element);
}
this._needsScrollToBottom = this.needsDraw = true;
this.childComponents.push(ruleObj.instance);
ruleObj.instance.needsDraw = true;
}, this);
}
},
didDraw : {
value: function() {
this.rulesToDraw.forEach(function(ruleObj) {
if(typeof ruleObj.callback === 'function') {
ruleObj.callback(ruleObj.instance);
}
});
this.rulesToRemove.forEach(function(ruleObj) {
ruleObj.instance = null;
}, this);
///// Null out any rules that were just drawn
this.rulesToDraw.length = 0;
this.rulesToRemove.length = 0;
this.parentComponent.ruleListDrawn = true;
this.parentComponent.needsDraw = true;
}
}
});
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