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Document new approach to styles.

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This commit is contained in:
Jürg Lehni 2013-04-19 19:51:04 -07:00
parent f51dc65cca
commit 41a58acb8c
1 changed files with 17 additions and 5 deletions
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22
src/style/Style.js
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@ -95,7 +95,15 @@ var Style = this.Style = Base.extend(new function() {
set = 'set' + part,
get = 'get' + part;
// Define getters and setters to be injected into this class
// Define getters and setters to be injected into this class.
// This is how style values are handled:
// - Style values are all stored in this._values
// - The style object starts with an empty _values object, with fallback
// on _defaults through code in the getter below.
// - Only the styles that are explicitely set on the object get defined
// in _values.
// - Color values are not stored as converted colors immediately. The
// raw value is stored, and conversion only happens in the getter.
fields[set] = function(value) {
var children = this._item && this._item._children;
// Clone color objects since they reference their owner
@ -107,13 +115,15 @@ var Style = this.Style = Base.extend(new function() {
children[i]._style[set](value);
} else {
var old = this._values[key];
if (old === undefined || !Base.equals(old, value)) {
if (old != value) {
if (isColor) {
if (old)
delete old._owner;
if (value && value.constructor === Color)
value._owner = this._item;
}
// Note: We do not convert the values to Colors in the
// setter. This only happens once the getter is called.
this._values[key] = value;
// Notify the item of the style change STYLE is always set,
// additional flags come from flags, as used for STROKE:
@ -136,8 +146,10 @@ var Style = this.Style = Base.extend(new function() {
if (value && value.clone)
value = value.clone();
this._values[key] = value;
} else if (isColor && !(value instanceof Color)) {
this._values[key] = value = Color.read([value], 0, 0, true, true);
} else if (isColor && !(value && value.constructor === Color)) {
// Convert to a Color and stored result of conversion.
this._values[key] = value = Color.read(
[value], 0, 0, true, true); // readNull
if (value)
value._owner = this._item;
}
@ -171,7 +183,7 @@ var Style = this.Style = Base.extend(new function() {
return fields;
}, /** @lends Style# */{
initialize: function(style) {
// Keep values in a separate object that we can iterate over.
// We keep values in a separate object that we can iterate over.
this._values = {};
if (this._item instanceof TextItem)
this._defaults = this._textDefaults;