definitions fixed

ui/core/control-state-change.ios.ts

@@ -0,0 +1,62 @@
+/* tslint:disable:no-unused-variable */
+import definition = require("ui/core/control-state-change");
+import visualStateConstants = require("ui/styling/visual-state-constants");
+
+var ObserverClass = NSObject.extend(
+    {
+        observeValueForKeyPathOfObjectChangeContext: function (path: string, obj: Object, change: NSDictionary, context: any) {
+            if (path === "selected") {
+                this["_owner"]._onSelectedChanged();
+            } else if (path === "enabled") {
+                this["_owner"]._onEnabledChanged();
+            } else if (path === "highlighted") {
+                this["_owner"]._onHighlightedChanged();
+            }
+        }
+    },
+    {
+    });
+
+export class ControlStateChangeListener implements definition.ControlStateChangeListener {
+    private _observer: NSObject;
+    private _states: string[];
+    private _control: UIControl;
+
+    private _callback: (state: string) => void;
+
+    constructor(control: UIControl, callback: (state: string) => void) {
+        this._observer = ObserverClass.alloc();
+        this._observer["_owner"] = this;
+
+        // TODO: Commenting for now, needs revision later since we must detach the observers upon control deallocation
+        //control.addObserverForKeyPathOptionsContext(this._observer, "selected", NSKeyValueObservingOptions.NSKeyValueObservingOptionNew, null);
+        //control.addObserverForKeyPathOptionsContext(this._observer, "enabled", NSKeyValueObservingOptions.NSKeyValueObservingOptionNew, null);
+        //control.addObserverForKeyPathOptionsContext(this._observer, "highlighted", NSKeyValueObservingOptions.NSKeyValueObservingOptionNew, null);
+
+        this._control = control;
+        this._callback = callback;
+    }
+
+    private _onEnabledChanged() {
+        this._updateState();
+    }
+
+    private _onSelectedChanged() {
+        this._updateState();
+    }
+
+    private _onHighlightedChanged() {
+        this._updateState();
+    }
+
+    private _updateState() {
+        var state = visualStateConstants.Normal;
+        if (this._control.highlighted) {
+            state = visualStateConstants.Pressed;
+        } else if (this._control.highlighted) {
+            // TODO:
+        }
+
+        this._callback(state);
+    }
+}