NativeScript/ui/image/image.android.ts

import imageCommon = require("ui/image/image-common");
import dependencyObservable = require("ui/core/dependency-observable");
import proxy = require("ui/core/proxy");
import enums = require("ui/enums");

global.moduleMerge(imageCommon, exports);

function onStretchPropertyChanged(data: dependencyObservable.PropertyChangeData) {
    var image = <Image>data.object;
    if (!image.android) {
        return;
    }

    switch (data.newValue) {
        case enums.Stretch.aspectFit:
            image.android.setScaleType(android.widget.ImageView.ScaleType.FIT_CENTER);
            break;
        case enums.Stretch.aspectFill:
            image.android.setScaleType(android.widget.ImageView.ScaleType.CENTER_CROP);
            break;
        case enums.Stretch.fill:
            image.android.setScaleType(android.widget.ImageView.ScaleType.FIT_XY);
            break;
        case enums.Stretch.none:
        default:
            image.android.setScaleType(android.widget.ImageView.ScaleType.MATRIX);
            break;
    }
}

function onImageSourcePropertyChanged(data: dependencyObservable.PropertyChangeData) {
    var image = <Image>data.object;
    if (!image.android) {
        return;
    }

    image._setNativeImage(data.newValue ? data.newValue.android : null);
}

// register the setNativeValue callback
(<proxy.PropertyMetadata>imageCommon.Image.imageSourceProperty.metadata).onSetNativeValue = onImageSourcePropertyChanged;
(<proxy.PropertyMetadata>imageCommon.Image.stretchProperty.metadata).onSetNativeValue = onStretchPropertyChanged;

export class Image extends imageCommon.Image {
    private _android: android.widget.ImageView;

    get android(): android.widget.ImageView {
        return this._android;
    }

    public _createUI() {
        this._android = new android.widget.ImageView(this._context);
    }

    public _setNativeImage(nativeImage: any) {
        this.android.setImageBitmap(nativeImage);
    }
}