buildMessageContent method

Implementation

@override
Widget buildMessageContent(BuildContext context, String? refName) {
  RCIMIWMediaMessage imageMessage = message as RCIMIWMediaMessage;
  //如果没有原图，下载原图
  if (imageMessage.local == null || imageMessage.local!.isEmpty) {
    context.read<RCKChatProvider>().downloadMediaMessage(imageMessage);
  }

  // 使用配置的图片样式
  final imageStyleConfig = config?.imageStyleConfig;
  final double maxWidth = imageStyleConfig?.maxWidth ?? 80;
  final double maxHeight = imageStyleConfig?.maxHeight ?? 150;
  final double scale = imageStyleConfig?.scale ?? 1.0;
  final BoxFit fit = imageStyleConfig?.fit ?? BoxFit.contain;
  final double borderRadius = imageStyleConfig?.borderRadius ?? 8.0;

  if (message is RCIMIWImageMessage) {
    RCIMIWImageMessage imageMessage = message as RCIMIWImageMessage;

    final double maxW = maxWidth * scale;
    final double maxH = maxHeight * scale;
    final String b64 = imageMessage.thumbnailBase64String ?? '';

    final natural = ImageUtil.getBase64NaturalSize(b64);
    final double ratio =
        (natural != null && natural.width > 0 && natural.height > 0)
            ? natural.width / natural.height
            : 3 / 4;

    double w = maxW;
    double h = w / ratio;
    if (h > maxH) {
      h = maxH;
      w = h * ratio;
    }

    return ClipRRect(
      borderRadius: BorderRadius.circular(borderRadius),
      child: SizedBox(
        width: w,
        height: h,
        child: ImageUtil.getImageWidget(
          "",
          thumbnailBase64String: b64,
          fit: fit,
        ),
      ),
    );
  } else if (message is RCIMIWGIFMessage) {
    RCIMIWGIFMessage gifMessage = message as RCIMIWGIFMessage;
    String? filePath = gifMessage.local;

    if (filePath != null &&
        filePath.startsWith('file://') &&
        Platform.isAndroid) {
      filePath = filePath.substring(7);
    }

    final double maxW = maxWidth * scale;
    final double maxH = maxHeight * scale;

    // 优先使用模型自带尺寸，否则尝试从本地文件解尺寸，最后兜底比例
    double? modelW = (gifMessage.width ?? 0).toDouble();
    double? modelH = (gifMessage.height ?? 0).toDouble();
    double? ratio;

    if ((modelW > 0) && (modelH > 0)) {
      ratio = modelW / modelH;
    } else if (filePath != null && filePath.isNotEmpty) {
      final natural = ImageUtil.getFileNaturalSize(filePath);
      if (natural != null && natural.width > 0 && natural.height > 0) {
        ratio = natural.width / natural.height;
      }
    }

    ratio ??= 1.0; // GIF 兜底为 1:1

    double w = maxW;
    double h = w / ratio;
    if (h > maxH) {
      h = maxH;
      w = h * ratio;
    }

    Widget child;
    if (filePath != null && filePath.isNotEmpty) {
      child = ImageUtil.getImageWidget(
        filePath,
        fit: fit,
        notInAssets: true,
      );
    } else {
      child = ImageUtil.getImageWidget(
        gifMessage.remote ?? "",
        fit: fit,
      );
    }

    return ClipRRect(
      borderRadius: BorderRadius.circular(borderRadius),
      child: SizedBox(
        width: w,
        height: h,
        child: child,
      ),
    );
  }
  return Container();
}