NativeScript/nativescript-core/ui/styling/background.android.ts

import { View } from "../core/view";
import { LinearGradient } from "./linear-gradient";

import { isDataURI, isFileOrResourcePath, layout, RESOURCE_PREFIX, FILE_PREFIX } from "../../utils/utils";
import { parse } from "../../css-value";
import { path, knownFolders } from "../../file-system";
import * as application from "../../application";
import { profile } from "../../profiling";
export * from "./background-common";

interface AndroidView {
    _cachedDrawable: android.graphics.drawable.Drawable.ConstantState | android.graphics.drawable.Drawable;
}

// TODO: Change this implementation to use
// We are using "ad" here to avoid namespace collision with the global android object
export module ad {
    let SDK: number;
    function getSDK() {
        if (!SDK) {
            SDK = android.os.Build.VERSION.SDK_INT;
        }

        return SDK;
    }

    function isSetColorFilterOnlyWidget(nativeView: android.view.View): boolean {
        return (
            nativeView instanceof android.widget.Button ||
            (nativeView instanceof androidx.appcompat.widget.Toolbar
                && getSDK() >= 21 // There is an issue with the DrawableContainer which was fixed for API version 21 and above: https://code.google.com/p/android/issues/detail?id=60183
            )
        );
    }

    export function onBackgroundOrBorderPropertyChanged(view: View) {
        const nativeView = <android.view.View>view.nativeViewProtected;
        if (!nativeView) {
            return;
        }

        const background = view.style.backgroundInternal;
        let drawable = nativeView.getBackground();
        const androidView = <any>view as AndroidView;
        // use undefined as not set. getBackground will never return undefined only Drawable or null;
        if (androidView._cachedDrawable === undefined && drawable) {
            const constantState = drawable.getConstantState();
            androidView._cachedDrawable = constantState || drawable;
        }

        if (isSetColorFilterOnlyWidget(nativeView)
            && drawable
            && !background.hasBorderWidth()
            && !background.hasBorderRadius()
            && !background.clipPath
            && !background.image
            && background.color) {

            if (drawable instanceof org.nativescript.widgets.BorderDrawable && androidView._cachedDrawable) {
                if (!(androidView._cachedDrawable instanceof android.graphics.drawable.Drawable.ConstantState)) {
                    return;
                }

                drawable = androidView._cachedDrawable.newDrawable(nativeView.getResources());
                nativeView.setBackground(drawable);
            }

            const backgroundColor = (<any>drawable).backgroundColor = background.color.android;
            drawable.mutate();
            drawable.setColorFilter(backgroundColor, android.graphics.PorterDuff.Mode.SRC_IN);
            drawable.invalidateSelf(); // Make sure the drawable is invalidated. Android forgets to invalidate it in some cases: toolbar
            (<any>drawable).backgroundColor = backgroundColor;
        } else if (!background.isEmpty()) {
            let backgroundDrawable = drawable as org.nativescript.widgets.BorderDrawable;
            if (!(drawable instanceof org.nativescript.widgets.BorderDrawable)) {
                backgroundDrawable = new org.nativescript.widgets.BorderDrawable(layout.getDisplayDensity(), view.toString());
                refreshBorderDrawable(view, backgroundDrawable);
                nativeView.setBackground(backgroundDrawable);
            } else {
                refreshBorderDrawable(view, backgroundDrawable);
            }
        } else {
            const cachedDrawable = androidView._cachedDrawable;
            let defaultDrawable: android.graphics.drawable.Drawable = null;
            if (cachedDrawable) {
                if (cachedDrawable instanceof android.graphics.drawable.Drawable.ConstantState) {
                    defaultDrawable = cachedDrawable.newDrawable(nativeView.getResources());
                } else if (cachedDrawable instanceof android.graphics.drawable.Drawable) {
                    defaultDrawable = cachedDrawable;
                }
            }

            nativeView.setBackground(defaultDrawable);
        }

        // TODO: Can we move BorderWidths as separate native setter?
        // This way we could skip setPadding if borderWidth is not changed.
        const leftPadding = Math.ceil(view.effectiveBorderLeftWidth + view.effectivePaddingLeft);
        const topPadding = Math.ceil(view.effectiveBorderTopWidth + view.effectivePaddingTop);
        const rightPadding = Math.ceil(view.effectiveBorderRightWidth + view.effectivePaddingRight);
        const bottomPadding = Math.ceil(view.effectiveBorderBottomWidth + view.effectivePaddingBottom);

        nativeView.setPadding(
            leftPadding,
            topPadding,
            rightPadding,
            bottomPadding
        );
    }
}

function fromBase64(source: string): android.graphics.Bitmap {
    const bytes = android.util.Base64.decode(source, android.util.Base64.DEFAULT);

    return android.graphics.BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
}

function fromGradient(gradient: LinearGradient): org.nativescript.widgets.LinearGradientDefinition {
    const colors = Array.create("int", gradient.colorStops.length);
    const stops = Array.create("float", gradient.colorStops.length);
    let hasStops = false;
    gradient.colorStops.forEach((stop, index) => {
        colors[index] = stop.color.android;
        if (stop.offset) {
            stops[index] = stop.offset.value;
            hasStops = true;
        }
    });

    const alpha = gradient.angle / (Math.PI * 2);
    const startX = Math.pow(
        Math.sin(Math.PI * (alpha + 0.75)),
        2
    );
    const startY = Math.pow(
        Math.sin(Math.PI * (alpha + 0.5)),
        2
    );
    const endX = Math.pow(
        Math.sin(Math.PI * (alpha + 0.25)),
        2
    );
    const endY = Math.pow(
        Math.sin(Math.PI * alpha),
        2
    );

    return new org.nativescript.widgets.LinearGradientDefinition(startX, startY, endX, endY, colors, hasStops ? stops : null);
}

const pattern: RegExp = /url\(('|")(.*?)\1\)/;
function refreshBorderDrawable(this: void, view: View, borderDrawable: org.nativescript.widgets.BorderDrawable) {
    const nativeView = <android.view.View>view.nativeViewProtected;
    const context = nativeView.getContext();

    const background = view.style.backgroundInternal;
    if (background) {
        const backgroundPositionParsedCSSValues = createNativeCSSValueArray(background.position);
        const backgroundSizeParsedCSSValues = createNativeCSSValueArray(background.size);
        const blackColor = -16777216; //android.graphics.Color.BLACK;

        let imageUri: string;
        if (background.image && typeof background.image === "string") {
            imageUri = background.image;
            const match = imageUri.match(pattern);
            if (match && match[2]) {
                imageUri = match[2];
            }
        }

        let bitmap: android.graphics.Bitmap = null;
        if (isDataURI(imageUri)) {
            const base64Data = imageUri.split(",")[1];
            if (base64Data !== undefined) {
                bitmap = fromBase64(base64Data);
                imageUri = null;
            }
        } else if (isFileOrResourcePath(imageUri)) {
            if (imageUri.indexOf(RESOURCE_PREFIX) !== 0) {
                let fileName = imageUri;
                if (fileName.indexOf("~/") === 0) {
                    fileName = path.join(knownFolders.currentApp().path, fileName.replace("~/", ""));
                }

                imageUri = FILE_PREFIX + fileName;
            }
        }

        let gradient: org.nativescript.widgets.LinearGradientDefinition = null;
        if (background.image && background.image instanceof LinearGradient) {
            gradient = fromGradient(background.image);
        }

        borderDrawable.refresh(
            background.borderTopColor ? background.borderTopColor.android : blackColor,
            background.borderRightColor ? background.borderRightColor.android : blackColor,
            background.borderBottomColor ? background.borderBottomColor.android : blackColor,
            background.borderLeftColor ? background.borderLeftColor.android : blackColor,

            background.borderTopWidth,
            background.borderRightWidth,
            background.borderBottomWidth,
            background.borderLeftWidth,

            background.borderTopLeftRadius,
            background.borderTopRightRadius,
            background.borderBottomRightRadius,
            background.borderBottomLeftRadius,

            background.clipPath,

            background.color ? background.color.android : 0,
            imageUri,
            bitmap,
            gradient,
            context,
            background.repeat,
            background.position,
            backgroundPositionParsedCSSValues,
            background.size,
            backgroundSizeParsedCSSValues
        );
        //console.log(`>>> ${borderDrawable.toDebugString()}`);
    }
}

function createNativeCSSValueArray(css: string): native.Array<org.nativescript.widgets.CSSValue> {
    if (!css) {
        return null;
    }

    const cssValues = parse(css);
    const nativeArray = Array.create(org.nativescript.widgets.CSSValue, cssValues.length);
    for (let i = 0, length = cssValues.length; i < length; i++) {
        nativeArray[i] = new org.nativescript.widgets.CSSValue(
            cssValues[i].type,
            cssValues[i].string,
            cssValues[i].unit,
            cssValues[i].value
        );
    }

    return nativeArray;
}

export enum CacheMode {
    none,
    memory,
    diskAndMemory
}

let currentCacheMode: CacheMode;
let imageFetcher: org.nativescript.widgets.image.Fetcher;

export function initImageCache(context: android.content.Context, mode = CacheMode.diskAndMemory, memoryCacheSize: number = 0.25, diskCacheSize: number = 10 * 1024 * 1024): void {
    if (currentCacheMode === mode) {
        return;
    }

    currentCacheMode = mode;
    if (!imageFetcher) {
        imageFetcher = org.nativescript.widgets.image.Fetcher.getInstance(context);
    } else {
        imageFetcher.clearCache();
    }

    const params = new org.nativescript.widgets.image.Cache.CacheParams();
    params.memoryCacheEnabled = mode !== CacheMode.none;
    params.setMemCacheSizePercent(memoryCacheSize); // Set memory cache to % of app memory
    params.diskCacheEnabled = mode === CacheMode.diskAndMemory;
    params.diskCacheSize = diskCacheSize;
    const imageCache = org.nativescript.widgets.image.Cache.getInstance(params);
    imageFetcher.addImageCache(imageCache);
    imageFetcher.initCache();
}

function onLivesync(args): void {
    if (imageFetcher) {
        imageFetcher.clearCache();
    }
}
application.on("livesync", onLivesync);

application.android.on("activityStarted", profile("initImageCache", args => {
    if (!imageFetcher) {
        initImageCache(args.activity);
    } else {
        imageFetcher.initCache();
    }
}));

application.android.on("activityStopped", profile("closeImageCache", args => {
    if (imageFetcher) {
        imageFetcher.closeCache();
    }
}));