NativeScript/tns-core-modules/ui/switch/switch.android.ts

import {
    SwitchBase, Color, colorProperty, backgroundColorProperty, backgroundInternalProperty, checkedProperty, offBackgroundColorProperty
} from "./switch-common";

export * from "./switch-common";

interface CheckedChangeListener {
    new(owner: Switch): android.widget.CompoundButton.OnCheckedChangeListener;
}

let CheckedChangeListener: CheckedChangeListener;

function initializeCheckedChangeListener(): void {
    if (CheckedChangeListener) {
        return;
    }

    @Interfaces([android.widget.CompoundButton.OnCheckedChangeListener])
    class CheckedChangeListenerImpl extends java.lang.Object implements android.widget.CompoundButton.OnCheckedChangeListener {
        constructor(private owner: Switch) {
            super();

            return global.__native(this);
        }

        onCheckedChanged(buttonView: android.widget.CompoundButton, isChecked: boolean): void {
            const owner = this.owner;
            checkedProperty.nativeValueChange(owner, isChecked);
        }
    }

    CheckedChangeListener = CheckedChangeListenerImpl;
}

export class Switch extends SwitchBase {
    nativeViewProtected: android.widget.Switch;
    public checked: boolean;

    public createNativeView() {
        return new android.widget.Switch(this._context);
    }

    public initNativeView(): void {
        super.initNativeView();
        const nativeView = this.nativeViewProtected;
        initializeCheckedChangeListener();
        const listener = new CheckedChangeListener(this);
        nativeView.setOnCheckedChangeListener(listener);
        (<any>nativeView).listener = listener;
    }

    public disposeNativeView() {
        const nativeView: any = this.nativeViewProtected;
        nativeView.listener.owner = null;
        super.disposeNativeView();
    }

    private setNativeBackgroundColor(value: string | number | Color) {
        if (value instanceof Color) {
            this.nativeViewProtected.getTrackDrawable().setColorFilter(value.android, android.graphics.PorterDuff.Mode.SRC_IN);
        } else {
            this.nativeViewProtected.getTrackDrawable().clearColorFilter();
        }
    }

    _onCheckedPropertyChanged(newValue: boolean) {
        if (this.offBackgroundColor) {
            if (!newValue) {
                this.setNativeBackgroundColor(this.offBackgroundColor);
            } else {
                this.setNativeBackgroundColor(this.backgroundColor);
            }
        }
    }

    [checkedProperty.getDefault](): boolean {
        return false;
    }
    [checkedProperty.setNative](value: boolean) {
        this.nativeViewProtected.setChecked(value);
    }

    [colorProperty.getDefault](): number {
        return -1;
    }
    [colorProperty.setNative](value: number | Color) {
        if (value instanceof Color) {
            this.nativeViewProtected.getThumbDrawable().setColorFilter(value.android, android.graphics.PorterDuff.Mode.SRC_IN);
        } else {
            this.nativeViewProtected.getThumbDrawable().clearColorFilter();
        }
    }

    [backgroundColorProperty.getDefault](): number {
        return -1;
    }
    [backgroundColorProperty.setNative](value: number | Color) {
        if (!this.offBackgroundColor || this.checked) {
            this.setNativeBackgroundColor(value);
        }
    }

    [backgroundInternalProperty.getDefault](): any {
        return null;
    }
    [backgroundInternalProperty.setNative](value: any) {
        //
    }

    [offBackgroundColorProperty.getDefault](): number {
        return -1;
    }
    [offBackgroundColorProperty.setNative](value: number | Color) {
        if (!this.checked) {
            this.setNativeBackgroundColor(value);
        }
    }
}