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JS refactor #781

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311 changes: 162 additions & 149 deletions jsbits/delegate.js
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Original file line number Diff line number Diff line change
@@ -1,158 +1,171 @@
window = typeof window === 'undefined' ? {} : window;
window['oldCallbacks'] = [];
window['currentCallbacks'] = [];

/* Callbacks in ghcjs need to be released. With this function one can register
callbacks that should be released right before diffing.
*/
window['registerCallback'] = function registerCallback(cb) {
window['currentCallbacks'].push(cb);
};

/* Swaps out the new calbacks for old callbacks.
The old callbacks should be cleared once the new callbacks have replaced them.
*/
window['swapCallbacks'] = function swapCallbacks() {
window['oldCallbacks'] = window['currentCallbacks'];
window['currentCallbacks'] = [];
};

/* This releases the old callbacks. */
window['releaseCallbacks'] = function releaseCallbacks() {
for (var i in window['oldCallbacks'])
h$release(window['oldCallbacks'][i]);

window['oldCallbacks'] = [];
};

/* event delegation algorithm */
window['delegate'] = function (mount, events, getVTree) {
for (var event in events)
mount.addEventListener
( events[event][0]
, function (e) { window['listener'](e, mount, getVTree); }
, events[event][1]
);
};

window['listener'] = function(e, mount, getVTree) {
getVTree(function (obj) {
window['delegateEvent'](e, obj, window['buildTargetToElement'](mount, e.target), []);
});
}

/* event delegation algorithm */
window['undelegate'] = function (mount, events, getVTree) {
for (var event in events)
mount.removeEventListener
( events[event][0]
, function (e) { window['listener'](e, mount, getVTree); }
, events[event][1]
);
};

/* Accumulate parent stack as well for propagation */
window['delegateEvent'] = function (event, obj, stack, parentStack) {

/* base case, not found */
if (!stack.length) return;

/* stack not length 1, recurse */
else if (stack.length > 1) {
parentStack.unshift(obj);
for (var o = 0; o < obj.children.length; o++) {
if (obj['type'] === 'vcomp') continue;
if (obj.children[o]['domRef'] === stack[1]) {
delegateEvent( event, obj.children[o], stack.slice(1), parentStack );
break;
window['miso'] = window['miso'] || {};

window['miso']['event'] = (function () {

var oldCallbacks = [];
var currentCallbacks = [];

/* Callbacks in ghcjs need to be released. With this function one can register
callbacks that should be released right before diffing.
*/
var registerCallback = function (cb) {
currentCallbacks.push(cb);
};

/* Swaps out the new calbacks for old callbacks.
The old callbacks should be cleared once the new callbacks have replaced them.
*/
var swapCallbacks = function() {
oldCallbacks = currentCallbacks;
currentCallbacks = [];
};

/* This releases the old callbacks. */
var releaseCallbacks = function () {
for (var i in oldCallbacks) {
if (h$release) {
// dmj: figure out what this is for the WASM backend
h$release(oldCallbacks[i]);
}
}
oldCallbacks = [];
};

/* event delegation algorithm */
var delegate = function (mount, events, getVTree) {
for (var event in events)
mount.addEventListener
( events[event][0]
, function (e) { listener(e, mount, getVTree); }
, events[event][1]
);
};

var listener = function(e, mount, getVTree) {
getVTree(function (obj) {
delegateEvent(e, obj, buildTargetToElement(mount, e.target), []);
});
}

/* stack.length == 1 */
else {
var eventObj = obj['events'][event.type];
if (eventObj) {
var options = eventObj.options;
if (options['preventDefault'])
event.preventDefault();
eventObj['runEvent'](event);
if (!options['stopPropagation'])
window['propagateWhileAble'] (parentStack, event);
} else {
/* still propagate to parent handlers even if event not defined */
window['propagateWhileAble'] (parentStack, event);

/* event delegation algorithm */
var undelegate = function (mount, events, getVTree) {
for (var event in events)
mount.removeEventListener
( events[event][0]
, function (e) { listener(e, mount, getVTree); }
, events[event][1]
);
};

/* Accumulate parent stack as well for propagation */
var delegateEvent = function (event, obj, stack, parentStack) {

/* base case, not found */
if (!stack.length) return;

/* stack not length 1, recurse */
else if (stack.length > 1) {
parentStack.unshift(obj);
for (var o = 0; o < obj.children.length; o++) {
if (obj['type'] === 'vcomp') continue;
if (obj.children[o]['domRef'] === stack[1]) {
delegateEvent( event, obj.children[o], stack.slice(1), parentStack );
break;
}
}
}
}
};

window['buildTargetToElement'] = function buildTargetToElement (element, target) {
var stack = [];
while (element !== target) {
stack.unshift (target);
target = target.parentNode;
}
return stack;
};

window['propagateWhileAble'] = function propagateWhileAble (parentStack, event) {
for (var i = 0; i < parentStack.length; i++) {
if (parentStack[i]['events'][event.type]) {
var eventObj = parentStack[i]['events'][event.type], options = eventObj['options'];
if (options['preventDefault']) event.preventDefault();
eventObj['runEvent'](event);
if (options['stopPropagation']) {
event.stopPropagation();
break;

/* stack.length == 1 */
else {
var eventObj = obj['events'][event.type];
if (eventObj) {
var options = eventObj.options;
if (options['preventDefault'])
event.preventDefault();
eventObj['runEvent'](event);
if (!options['stopPropagation'])
propagateWhileAble (parentStack, event);
} else {
/* still propagate to parent handlers even if event not defined */
propagateWhileAble (parentStack, event);
}
}
}
};

/* Walks down obj following the path described by `at`, then filters primitive
values (string, numbers and booleans)*/
window['objectToJSON'] = function objectToJSON (at, obj) {
/* If at is of type [[MisoString]] */
if (typeof at[0] == 'object') {
var ret = [];
for (var i = 0; i < at.length; i++)
ret.push(window['objectToJSON'](at[i], obj));
return ret;
}

for (var i in at) obj = obj[at[i]];

/* If obj is a list-like object */
var newObj;
if (obj instanceof Array || ('length' in obj && obj['localName'] !== 'select')) {
newObj = [];
for (var i = 0; i < obj.length; i++)
newObj.push(window['objectToJSON']([], obj[i]));
};

var buildTargetToElement = function (element, target) {
var stack = [];
while (element !== target) {
stack.unshift (target);
target = target.parentNode;
}
return stack;
};

var propagateWhileAble = function (parentStack, event) {
for (var i = 0; i < parentStack.length; i++) {
if (parentStack[i]['events'][event.type]) {
var eventObj = parentStack[i]['events'][event.type], options = eventObj['options'];
if (options['preventDefault']) event.preventDefault();
eventObj['runEvent'](event);
if (options['stopPropagation']) {
event.stopPropagation();
break;
}
}
}
};

/* Walks down obj following the path described by `at`, then filters primitive
values (string, numbers and booleans)*/
var objectToJSON = function (at, obj) {
/* If at is of type [[MisoString]] */
if (typeof at[0] == 'object') {
var ret = [];
for (var i = 0; i < at.length; i++)
ret.push(window['objectToJSON'](at[i], obj));
return ret;
}

for (var i in at) obj = obj[at[i]];

/* If obj is a list-like object */
var newObj;
if (obj instanceof Array || ('length' in obj && obj['localName'] !== 'select')) {
newObj = [];
for (var i = 0; i < obj.length; i++)
newObj.push(window['objectToJSON']([], obj[i]));
return newObj;
}

/* If obj is a non-list-like object */
newObj = {};
for (var i in getAllPropertyNames(obj)){
/* bug in safari, throws TypeError if the following fields are referenced on a checkbox */
/* https://stackoverflow.com/a/25569117/453261 */
/* https://html.spec.whatwg.org/multipage/input.html#do-not-apply */
if ((obj['localName'] === 'input') && (i === 'selectionDirection' || i === 'selectionStart' || i === 'selectionEnd'))
continue;
if (typeof obj[i] == 'string' || typeof obj[i] == 'number' || typeof obj[i] == 'boolean')
newObj[i] = obj[i];
}
return newObj;
}
};

/* get static and dynamic properties */
function getAllPropertyNames(obj) {
var props = {}, i = 0;
do {
var names = Object.getOwnPropertyNames(obj);
for (i = 0; i < names.length; i++) {
props [names[i]] = null;
}
} while (obj = Object.getPrototypeOf(obj));
return props;
};

/* If obj is a non-list-like object */
newObj = {};
for (var i in getAllPropertyNames(obj)){
/* bug in safari, throws TypeError if the following fields are referenced on a checkbox */
/* https://stackoverflow.com/a/25569117/453261 */
/* https://html.spec.whatwg.org/multipage/input.html#do-not-apply */
if ((obj['localName'] === 'input') && (i === 'selectionDirection' || i === 'selectionStart' || i === 'selectionEnd'))
continue;
if (typeof obj[i] == 'string' || typeof obj[i] == 'number' || typeof obj[i] == 'boolean')
newObj[i] = obj[i];
}
return newObj;
};
return {
'delegate' : delegate,
'undelegate' : undelegate
};

/* get static and dynamic properties */
function getAllPropertyNames(obj) {
var props = {}, i = 0;
do {
var names = Object.getOwnPropertyNames(obj);
for (i = 0; i < names.length; i++) {
props [names[i]] = null;
}
} while (obj = Object.getPrototypeOf(obj));
return props;
};
})()
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