Merge pull request #162 from namiwang/img-src-asset

asset support for <img>

Author: Sub6Resources

lib/rich_text_parser.dart

@@ -787,6 +787,59 @@ class HtmlRichTextParser extends StatelessWidget {
                       }
                     },
                   ));
+                } else if (node.attributes['src'].startsWith('asset:')) {
+                  final assetPath = node.attributes['src'].replaceFirst('asset:', '');
+                  precacheImage(
+                    AssetImage(assetPath),
+                    buildContext,
+                    onError: onImageError ?? (_, __) {},
+                  );
+                  parseContext.rootWidgetList.add(GestureDetector(
+                    child: Image.asset(
+                      assetPath,
+                      frameBuilder: (context, child, frame, _) {
+                        if (node.attributes['alt'] != null && frame == null) {
+                          return BlockText(
+                            child: RichText(
+                              textAlign: TextAlign.center,
+                              text: TextSpan(
+                                text: node.attributes['alt'],
+                                style: nextContext.childStyle,
+                              ),
+                            ),
+                            shrinkToFit: shrinkToFit,
+                          );
+                        }
+                        if (frame != null) {
+                          return child;
+                        }
+                        return Container();
+                      },
+                      width: (width ?? -1) > 0 ? width : null,
+                      height: (height ?? -1) > 0 ? height : null,
+                      scale: imageProperties?.scale ?? 1.0,
+                      matchTextDirection:
+                          imageProperties?.matchTextDirection ?? false,
+                      centerSlice: imageProperties?.centerSlice,
+                      filterQuality:
+                          imageProperties?.filterQuality ?? FilterQuality.low,
+                      alignment: imageProperties?.alignment ?? Alignment.center,
+                      colorBlendMode: imageProperties?.colorBlendMode,
+                      fit: imageProperties?.fit,
+                      color: imageProperties?.color,
+                      repeat: imageProperties?.repeat ?? ImageRepeat.noRepeat,
+                      semanticLabel: imageProperties?.semanticLabel,
+                      excludeFromSemantics:
+                          (imageProperties?.semanticLabel == null)
+                              ? true
+                              : false,
+                    ),
+                    onTap: () {
+                      if (onImageTap != null) {
+                        onImageTap(node.attributes['src']);
+                      }
+                    },
+                  ));
                 } else {
                   precacheImage(
                     NetworkImage(node.attributes['src']),