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Gestures are now detached when a View is unloaded.

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Rossen Hristov
2015-04-22 09:14:37 +03:00
parent 85ceae7a44
commit c1672346c4
1 changed files with 46 additions and 14 deletions
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60
ui/gestures/gestures.ios.ts
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@ -1,11 +1,8 @@
import common = require("ui/gestures/gestures-common"); import common = require("ui/gestures/gestures-common");
import definition = require("ui/gestures"); import definition = require("ui/gestures");
import view = require("ui/core/view"); import view = require("ui/core/view");
import observable = require("data/observable");
//var OWNER = "_owner"; import trace = require("trace");
//var CALLBACK = "_callback";
//var TYPE = "_type";
//var TARGET = "_target";
// merge the exports of the request file with the exports of this file // merge the exports of the request file with the exports of this file
declare var exports; declare var exports;
@ -57,17 +54,42 @@ export class GesturesObserver implements definition.GesturesObserver {
public _target: view.View; public _target: view.View;
private _recognizers: {}; private _recognizers: {};
private _onTargetLoaded: (data: observable.EventData) => void;
private _onTargetUnloaded: (data: observable.EventData) => void;
constructor(callback: (args: definition.GestureEventData) => void) { constructor(callback: (args: definition.GestureEventData) => void) {
this._callback = callback; this._callback = callback;
this._recognizers = {}; this._recognizers = {};
} }
public observe(target: view.View, type: definition.GestureTypes) { public observe(target: view.View, type: definition.GestureTypes) {
this.disconnect(); if (target) {
this._target = target;
this._onTargetLoaded = args => {
trace.write(this._target + ".target loaded. _nativeView:" + this._target._nativeView, "gestures");
this._attach(target, type);
};
this._onTargetUnloaded = args => {
trace.write(this._target + ".target unloaded. _nativeView:" + this._target._nativeView, "gestures");
this._dettach();
};
this._target = target; target.on(view.knownEvents.loaded, this._onTargetLoaded);
if (this._target && this._target._nativeView && this._target._nativeView.addGestureRecognizer) { target.on(view.knownEvents.unloaded, this._onTargetUnloaded);
var nativeView = <UIView>this._target._nativeView;
if (target.isLoaded) {
this._attach(target, type);
}
}
}
private _attach(target: view.View, type: definition.GestureTypes) {
trace.write(target + "._attach() _nativeView:" + target._nativeView, "gestures");
this._dettach();
if (target && target._nativeView && target._nativeView.addGestureRecognizer) {
var nativeView = <UIView>target._nativeView;
if (type & definition.GestureTypes.tap) { if (type & definition.GestureTypes.tap) {
nativeView.addGestureRecognizer(this._createRecognizer(definition.GestureTypes.tap)); nativeView.addGestureRecognizer(this._createRecognizer(definition.GestureTypes.tap));
@ -88,7 +110,7 @@ export class GesturesObserver implements definition.GesturesObserver {
if (type & definition.GestureTypes.pan) { if (type & definition.GestureTypes.pan) {
nativeView.addGestureRecognizer(this._createRecognizer(definition.GestureTypes.pan, args => { nativeView.addGestureRecognizer(this._createRecognizer(definition.GestureTypes.pan, args => {
this._executeCallback(_getPanData(args, this._target._nativeView)); this._executeCallback(_getPanData(args, target._nativeView));
})); }));
} }
@ -122,9 +144,9 @@ export class GesturesObserver implements definition.GesturesObserver {
} }
} }
public disconnect() { private _dettach() {
trace.write(this._target + "._dettach() _nativeView:" + this._target._nativeView, "gestures");
if (this._target && this._target._nativeView) { if (this._target && this._target._nativeView) {
for (var name in this._recognizers) { for (var name in this._recognizers) {
if (this._recognizers.hasOwnProperty(name)) { if (this._recognizers.hasOwnProperty(name)) {
var item = <RecognizerCache>this._recognizers[name]; var item = <RecognizerCache>this._recognizers[name];
@ -134,11 +156,21 @@ export class GesturesObserver implements definition.GesturesObserver {
item.target = null; item.target = null;
} }
} }
this._recognizers = {}; this._recognizers = {};
} }
}
this._target = null; public disconnect() {
this._dettach();
if (this._target) {
this._target.off(view.knownEvents.loaded, this._onTargetLoaded);
this._target.off(view.knownEvents.unloaded, this._onTargetUnloaded);
this._onTargetLoaded = null;
this._onTargetUnloaded = null;
this._target = null;
}
} }
private _executeCallback(args: definition.GestureEventData) { private _executeCallback(args: definition.GestureEventData) {