forked from NativeScript/NativeScript
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathbindable.ts
More file actions
391 lines (336 loc) · 13.5 KB
/
bindable.ts
File metadata and controls
391 lines (336 loc) · 13.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
import observable = require("data/observable");
import definition = require("ui/core/bindable");
import dependencyObservable = require("ui/core/dependency-observable");
import weakEvents = require("ui/core/weak-event-listener");
import appModule = require("application");
import types = require("utils/types");
import trace = require("trace");
import polymerExpressions = require("js-libs/polymer-expressions");
import bindingBuilder = require("../builder/binding-builder");
import viewModule = require("ui/core/view");
var bindingContextProperty = new dependencyObservable.Property(
"bindingContext",
"Bindable",
new dependencyObservable.PropertyMetadata(undefined, dependencyObservable.PropertyMetadataSettings.Inheritable, onBindingContextChanged)
);
function onBindingContextChanged(data: dependencyObservable.PropertyChangeData) {
var bindable = <Bindable>data.object;
bindable._onBindingContextChanged(data.oldValue, data.newValue);
}
var contextKey = "context";
export class Bindable extends dependencyObservable.DependencyObservable implements definition.Bindable {
public static bindingContextProperty = bindingContextProperty;
// TODO: Implement with WeakRef to prevent memory leaks.
private _bindings = {};
get bindingContext(): Object {
return this._getValue(Bindable.bindingContextProperty);
}
set bindingContext(value: Object) {
this._setValue(Bindable.bindingContextProperty, value);
}
public bind(options: definition.BindingOptions, source?: Object) {
var binding: Binding = this._bindings[options.targetProperty];
if (binding) {
binding.unbind();
}
binding = new Binding(this, options);
this._bindings[options.targetProperty] = binding;
var bindingSource = source;
if (!bindingSource) {
bindingSource = this.bindingContext;
binding.sourceIsBindingContext = true;
}
if (!types.isNullOrUndefined(bindingSource)) {
binding.bind(bindingSource);
}
}
public unbind(property: string) {
var binding: Binding = this._bindings[property];
if (binding) {
binding.unbind();
delete this._bindings[property];
}
}
public _updateTwoWayBinding(propertyName: string, value: any) {
var binding: Binding = this._bindings[propertyName];
if (binding) {
binding.updateTwoWay(value);
}
}
public _setCore(data: observable.PropertyChangeData) {
super._setCore(data);
this._updateTwoWayBinding(data.propertyName, data.value);
}
public _onPropertyChanged(property: dependencyObservable.Property, oldValue: any, newValue: any) {
trace.write("Bindable._onPropertyChanged(" + this + ") " + property.name, trace.categories.Binding);
super._onPropertyChanged(property, oldValue, newValue);
if (this instanceof viewModule.View) {
if (property.metadata.inheritable && (<viewModule.View>(<any>this))._isInheritedChange() === true) {
return;
}
}
var binding = this._bindings[property.name];
if (binding && !binding.updating) {
if (binding.options.twoWay) {
trace.write("_updateTwoWayBinding(" + this + "): " + property.name, trace.categories.Binding);
this._updateTwoWayBinding(property.name, newValue);
}
else {
trace.write("_onPropertyChanged(" + this + ") removing binding for property: " + property.name, trace.categories.Binding);
this.unbind(property.name);
}
}
}
public _onBindingContextChanged(oldValue: any, newValue: any) {
var binding: Binding;
for (var p in this._bindings) {
binding = this._bindings[p];
if (binding.updating || !binding.sourceIsBindingContext) {
continue;
}
trace.write(
"Binding target: " + binding.target.get() +
" targetProperty: " + binding.options.targetProperty +
" to the changed context: " + newValue, trace.categories.Binding);
binding.unbind();
if (!types.isNullOrUndefined(newValue)) {
binding.bind(newValue);
}
}
}
}
export class Binding {
options: definition.BindingOptions;
updating = false;
sourceIsBindingContext: boolean;
source: WeakRef<Object>;
target: WeakRef<Bindable>;
private sourceOptions: { instance: WeakRef<any>; property: any };
private targetOptions: { instance: WeakRef<any>; property: any };
constructor(target: Bindable, options: definition.BindingOptions) {
this.target = new WeakRef(target);
this.options = options;
}
public bind(obj: Object) {
if (types.isNullOrUndefined(obj)) {
throw new Error("Expected valid object reference as a source in the Binding.bind method.");
}
/* tslint:disable */
if (typeof (obj) === "number") {
obj = new Number(obj);
}
if (typeof (obj) === "boolean") {
obj = new Boolean(obj);
}
if (typeof (obj) === "string") {
obj = new String(obj);
}
/* tslint:enable */
this.source = new WeakRef(obj);
this.updateTarget(this.getSourceProperty());
if (!this.sourceOptions) {
this.sourceOptions = this.resolveOptions(this.source, this.options.sourceProperty);
}
if (this.sourceOptions) {
var sourceOptionsInstance = this.sourceOptions.instance.get();
if (sourceOptionsInstance instanceof observable.Observable) {
weakEvents.addWeakEventListener(
sourceOptionsInstance,
observable.Observable.propertyChangeEvent,
this.onSourcePropertyChanged,
this);
}
}
}
public unbind() {
if (!this.source) {
return;
}
if (this.sourceOptions) {
var sourceOptionsInstance = this.sourceOptions.instance.get();
if (sourceOptionsInstance) {
weakEvents.removeWeakEventListener(sourceOptionsInstance,
observable.Observable.propertyChangeEvent,
this.onSourcePropertyChanged,
this);
}
}
if (this.source) {
this.source.clear();
}
if (this.sourceOptions) {
this.sourceOptions.instance.clear();
this.sourceOptions = undefined;
}
if (this.targetOptions) {
this.targetOptions = undefined;
}
}
public updateTwoWay(value: any) {
if (this.updating) {
return;
}
if (this.options.twoWay) {
if (this.options.expression) {
var changedModel = {};
changedModel[bindingBuilder.bindingConstants.bindingValueKey] = value;
var sourcePropertyName = "";
if (this.sourceOptions) {
sourcePropertyName = this.sourceOptions.property;
}
else if (typeof this.options.sourceProperty === "string" && this.options.sourceProperty.indexOf(".") === -1) {
sourcePropertyName = this.options.sourceProperty;
}
if (sourcePropertyName !== "") {
changedModel[sourcePropertyName] = value;
}
var expressionValue = this._getExpressionValue(this.options.expression, true, changedModel);
if (expressionValue instanceof Error) {
trace.write((<Error>expressionValue).message, trace.categories.Binding, trace.messageType.error);
}
else {
this.updateSource(expressionValue);
}
}
else {
this.updateSource(value);
}
}
}
private _getExpressionValue(expression: string, isBackConvert: boolean, changedModel: any): any {
try {
var exp = polymerExpressions.PolymerExpressions.getExpression(expression);
if (exp) {
var context = this.source && this.source.get && this.source.get() || global;
var model = {};
for (var prop in appModule.resources) {
if (appModule.resources.hasOwnProperty(prop) && !context.hasOwnProperty(prop)) {
context[prop] = appModule.resources[prop];
}
}
model[contextKey] = context;
return exp.getValue(model, isBackConvert, changedModel);
}
return new Error(expression + " is not a valid expression.");
}
catch (e) {
var errorMessage = "Run-time error occured in file: " + e.sourceURL + " at line: " + e.line + " and column: " + e.column;
return new Error(errorMessage);
}
}
public onSourcePropertyChanged(data: observable.PropertyChangeData) {
if (this.options.expression) {
var expressionValue = this._getExpressionValue(this.options.expression, false, undefined);
if (expressionValue instanceof Error) {
trace.write((<Error>expressionValue).message, trace.categories.Binding, trace.messageType.error);
}
else {
this.updateTarget(expressionValue);
}
} else if (data.propertyName === this.options.sourceProperty) {
this.updateTarget(data.value);
}
}
private getSourceProperty() {
if (this.options.expression) {
var changedModel = {};
changedModel[bindingBuilder.bindingConstants.bindingValueKey] = this.source.get();
var expressionValue = this._getExpressionValue(this.options.expression, false, changedModel);
if (expressionValue instanceof Error) {
trace.write((<Error>expressionValue).message, trace.categories.Binding, trace.messageType.error);
}
else {
return expressionValue;
}
}
if (!this.sourceOptions) {
this.sourceOptions = this.resolveOptions(this.source, this.options.sourceProperty);
}
var value;
if (this.sourceOptions) {
var sourceOptionsInstance = this.sourceOptions.instance.get();
if (this.sourceOptions.property === bindingBuilder.bindingConstants.bindingValueKey) {
value = sourceOptionsInstance;
}
else if (sourceOptionsInstance instanceof observable.Observable) {
value = sourceOptionsInstance.get(this.sourceOptions.property);
}
else if (sourceOptionsInstance && this.sourceOptions.property &&
this.sourceOptions.property in sourceOptionsInstance) {
value = sourceOptionsInstance[this.sourceOptions.property];
}
}
return value;
}
private updateTarget(value: any) {
if (this.updating || (!this.target || !this.target.get())) {
return;
}
if (!this.targetOptions) {
this.targetOptions = this.resolveOptions(this.target, this.options.targetProperty);
}
this.updateOptions(this.targetOptions, value);
}
private updateSource(value: any) {
if (this.updating || (!this.source || !this.source.get())) {
return;
}
if (!this.sourceOptions) {
this.sourceOptions = this.resolveOptions(this.source, this.options.sourceProperty);
}
this.updateOptions(this.sourceOptions, value);
}
private resolveOptions(obj: WeakRef<any>, property: string): { instance: any; property: any } {
var options;
if (property === bindingBuilder.bindingConstants.bindingValueKey) {
options = {
instance: obj,
property: property
};
return options;
}
if (types.isString(property) && property.indexOf(".") !== -1) {
var properties = property.split(".");
var i: number;
var currentObject = obj.get();
for (i = 0; i < properties.length - 1; i++) {
currentObject = currentObject[properties[i]];
}
if (!types.isNullOrUndefined(currentObject)) {
options = {
instance: new WeakRef(currentObject),
property: properties[properties.length - 1]
}
}
} else {
options = {
instance: obj,
property: property
}
}
return options;
}
private updateOptions(options: { instance: WeakRef<any>; property: any }, value: any) {
var optionsInstance;
if (options && options.instance) {
optionsInstance = options.instance.get();
}
if (!optionsInstance) {
return;
}
this.updating = true;
try {
if (optionsInstance instanceof observable.Observable) {
optionsInstance.set(options.property, value);
} else {
optionsInstance[options.property] = value;
}
}
catch (ex) {
trace.write("Binding error while setting property " + options.property + " of " + optionsInstance + ": " + ex,
trace.categories.Binding,
trace.messageType.error);
}
this.updating = false;
}
}