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uiProperty

This commit is contained in:
Tony Garnock-Jones 2016-05-15 14:58:13 -04:00
parent b92c439f07
commit 152a76af5e
1 changed files with 77 additions and 39 deletions
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116
js/src/ui.js
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@ -63,6 +63,9 @@ var uiFragmentExists = Struct.makeConstructor('ui-fragment-exists', ['fragmentId
// already present. (See the implementation for details.)
var uiAttribute = Struct.makeConstructor('ui-attribute', ['selector', 'attribute', 'value']);
// Assertion. Similar to uiAttribute, but for properties of DOM nodes.
var uiProperty = Struct.makeConstructor('ui-property', ['selector', 'property', 'value']);
// Messages.
// NOTE: These do not treat "class" specially!
var setAttribute = Struct.makeConstructor('set-ui-attribute', ['selector', 'attribute', 'value']);
@ -120,7 +123,16 @@ function spawnUIDriver(options) {
new DemandMatcher([uiAttribute(_$('selector'), _$('attribute'), _$('value'))],
[Patch.advertise(uiAttribute(_$('selector'), _$('attribute'), _$('value')))],
function (c) {
Dataspace.spawn(new UIAttribute(c.selector, c.attribute, c.value));
Dataspace.spawn(new UIAttribute(
c.selector, c.attribute, c.value, 'attribute'));
}));
Dataspace.spawn(
new DemandMatcher([uiProperty(_$('selector'), _$('property'), _$('value'))],
[Patch.advertise(uiProperty(_$('selector'), _$('property'), _$('value')))],
function (c) {
Dataspace.spawn(new UIAttribute(
c.selector, c.property, c.value, 'property'));
}));
Dataspace.spawn(new AttributeUpdater());
@ -430,24 +442,31 @@ UIFragment.prototype.handleDomEvent = function (c, e) {
///////////////////////////////////////////////////////////////////////////
function UIAttribute(selector, attribute, value) {
function UIAttribute(selector, key, value, kind) {
if (['attribute', 'property'].indexOf(kind) === -1) {
throw new Error("UIAttribute: kind must be 'attribute' or 'property'; got " + kind);
}
this.selector = selector;
this.attribute = attribute;
this.key = key;
this.value = value;
this.kind = kind;
this.savedValues = [];
// ^ Array of {node: DOMNode, value: (U Null String)}, when attribute !== 'class'.
// ^ Array of {node: DOMNode}, when attribute === 'class'.
// ^ Array of {node: DOMNode, value: (U Null String)},
// when attribute !== 'class' or kind !== 'attribute'.
// ^ Array of {node: DOMNode},
// when attribute === 'class' and kind === 'attribute'.
}
UIAttribute.prototype.boot = function () {
var a = uiAttribute(this.selector, this.attribute, this.value);
var a = ((this.kind === 'attribute') ? uiAttribute : uiProperty)(this.selector, this.key, this.value);
this.install();
return Patch.sub(a).andThen(Patch.pub(a));
};
UIAttribute.prototype.trapexit = function () {
console.log('UIAttribute trapexit running', this.selector, this.attribute, this.value);
console.log('UIAttribute trapexit running', this.selector, this.key, this.value, this.kind);
this.restoreSavedValues();
};
@ -458,20 +477,27 @@ function splitClassValue(v) {
UIAttribute.prototype.install = function () {
var self = this;
var nodes = Array.prototype.slice.call(document.querySelectorAll(self.selector));
nodes.forEach(function (node) {
if (self.attribute === 'class') {
// Deliberately maintains duplicates, so we don't interfere with
// potential other UIAttribute instances on the same objects for
// the same attribute. See also restoreSavedValues.
var existing = splitClassValue(node.getAttribute('class'));
var toAdd = splitClassValue(self.value);
self.savedValues.push({node: node});
node.setAttribute('class', existing.concat(toAdd).join(' '));
} else {
self.savedValues.push({node: node, value: node.getAttribute(self.attribute)});
node.setAttribute(self.attribute, self.value);
selectorMatch(document, self.selector).forEach(function (node) {
switch (self.kind) {
case 'attribute':
if (self.key === 'class') {
// Deliberately maintains duplicates, so we don't interfere
// with potential other UIAttribute instances on the same
// objects for the same attribute. See also
// restoreSavedValues.
var existing = splitClassValue(node.getAttribute('class'));
var toAdd = splitClassValue(self.value);
self.savedValues.push({node: node});
node.setAttribute('class', existing.concat(toAdd).join(' '));
} else {
self.savedValues.push({node: node, value: node.getAttribute(self.key)});
node.setAttribute(self.key, self.value);
}
break;
case 'property':
self.savedValues.push({node: node, value: node[self.key]});
node[self.key] = self.value;
break;
}
});
};
@ -479,24 +505,35 @@ UIAttribute.prototype.install = function () {
UIAttribute.prototype.restoreSavedValues = function () {
var self = this;
self.savedValues.forEach(function (entry) {
if (self.attribute === 'class') {
var existing = splitClassValue(entry.node.getAttribute('class'));
var toRemove = splitClassValue(self.value);
toRemove.forEach(function (v) {
var i = existing.indexOf(v);
if (i !== -1) { existing.splice(i, 1); }
});
if (existing.length === 0) {
entry.node.removeAttribute('class');
} else {
entry.node.setAttribute('class', existing.join(' '));
}
} else {
if (entry.value === null) {
entry.node.removeAttribute(self.attribute);
} else {
entry.node.setAttribute(self.attribute, entry.value);
}
switch (self.kind) {
case 'attribute':
if (self.key === 'class') {
var existing = splitClassValue(entry.node.getAttribute('class'));
var toRemove = splitClassValue(self.value);
toRemove.forEach(function (v) {
var i = existing.indexOf(v);
if (i !== -1) { existing.splice(i, 1); }
});
if (existing.length === 0) {
entry.node.removeAttribute('class');
} else {
entry.node.setAttribute('class', existing.join(' '));
}
} else {
if (entry.value === null) {
entry.node.removeAttribute(self.key);
} else {
entry.node.setAttribute(self.key, entry.value);
}
}
break;
case 'property':
if (typeof entry.value === 'undefined') {
delete entry.node[self.key];
} else {
entry.node[self.key] = entry.value;
}
break;
}
});
self.savedValues = [];
@ -683,6 +720,7 @@ module.exports.uiEvent = uiEvent;
module.exports.uiFragment = uiFragment;
module.exports.uiFragmentExists = uiFragmentExists;
module.exports.uiAttribute = uiAttribute;
module.exports.uiProperty = uiProperty;
module.exports.setAttribute = setAttribute;
module.exports.removeAttribute = removeAttribute;
module.exports.setProperty = setProperty;