createDarkSplashImageDrawable function

Implementation

Future<void> createDarkSplashImageDrawable({
  String? darkImage,
  String? color,
  String? gravity,
  String? darkBackgroundImageSource,
  String? backgroundImageGravity,
}) async {
  if (darkImage == null && darkBackgroundImageSource == null && color == null) {
    return;
  }

  // Verify dark image exists if provided
  if (darkImage != null && !await File(darkImage).exists()) {
    throw SplashMasterException(
        message: 'Dark splash image not found at $darkImage.');
  }

  const androidDrawableFolder = CmdStrings.androidDrawableDarkDirectory;
  const splashImagePath =
      '$androidDrawableFolder/${AndroidStrings.splashScreenDarkXml}';
  final file = File(splashImagePath);

  final xml = await file.create(recursive: true);

  final builder = XmlBuilder();

  builder.processing(AndroidStrings.xml, AndroidStrings.xmlVersion);

  /// Creating a layer-list element and its attributes
  builder.element(AndroidStrings.layerListElement, nest: () {
    builder.attribute(
      AndroidStrings.xmlnsAndroidAttr,
      AndroidStrings.xmlnsAndroidAttrValue,
    );

    /// Creates item element and attributes for color
    if (color != null) {
      builder.element(
        AndroidStrings.itemElement,
        nest: () {
          builder.attribute(
            AndroidStrings.androidDrawableAttr,
            AndroidStrings.androidDrawableAttrVal,
          );
        },
      );
    }

    /// Creates item element and attributes for dark background image
    if (darkBackgroundImageSource != null) {
      builder.element(AndroidStrings.itemElement, nest: () {
        builder.element(AndroidStrings.bitmapAttrVal, nest: () {
          builder.attribute(
            AndroidStrings.androidGravityAttr,
            backgroundImageGravity ??
                AndroidStrings.defaultAndroidGravityAttrVal,
          );
          builder.attribute(
            AndroidStrings.androidSrcAttr,
            AndroidStrings.androidDarkBackgroundSrcAttrVal,
          );
          builder.attribute(
            AndroidStrings.androidTileModeAttr,
            AndroidStrings.androidTileModeAttrVal,
          );
        });
      });
    }

    /// Creates item element and attributes for image (only if dark image exists)
    if (darkImage != null) {
      builder.element(AndroidStrings.itemElement, nest: () {
        builder.element(AndroidStrings.bitmapAttrVal, nest: () {
          builder.attribute(
            AndroidStrings.androidGravityAttr,
            gravity ?? AndroidStrings.defaultAndroidGravityAttrVal,
          );
          builder.attribute(
            AndroidStrings.androidSrcAttr,
            AndroidStrings.androidDarkSrcAttrVal,
          );
          builder.attribute(
            AndroidStrings.androidTileModeAttr,
            AndroidStrings.androidTileModeAttrVal,
          );
        });
      });
    }
  });

  final document = builder.buildDocument();
  await xml.writeAsString(document.toXmlString(pretty: true));
}