Update app.py

app.py

@@ -303,6 +303,31 @@ async def process_file(file_path):
     return str(tmp_file_path)
 
 
+
+import gradio as gr
+import base64, pathlib
+
+def embed_file(file, scale):
+    """根据后缀决定用 PDF 还是 <img>."""
+    path = pathlib.Path(file.name)
+    data = base64.b64encode(path.read_bytes()).decode()
+    if path.suffix.lower() == ".pdf":
+        # PDF：借浏览器内建 viewer，使用 #zoom=xxx 控制
+        return (
+            f'<iframe style="width:100%;height:800px;border:none" '
+            f'src="data:application/pdf;base64,{data}#zoom={int(scale*100)}"></iframe>'
+        )
+    else:
+        # 图片：CSS transform 实现 zoom；支持拖拽滚轮缩放
+        return (
+            f'<div style="overflow:auto;border:1px solid #ccc;'
+            f'width:100%;height:800px;text-align:center">'
+            f'<img src="data:image/{path.suffix[1:]};base64,{data}" '
+            f'style="transform:scale({scale});transform-origin:0 0;" />'
+            f'</div>'
+        )
+
+
 if __name__ == '__main__':
     with gr.Blocks() as demo:
         with gr.Row():
@@ -322,7 +347,14 @@ if __name__ == '__main__':
                 with gr.Row():
                     change_bu = gr.Button('Parse')
                     clear_bu = gr.ClearButton(value='Clear')
-                pdf_show = PDF(label='Preview', interactive=False, visible=True, height=800)
+                # pdf_show = PDF(label='Preview', interactive=False, visible=True, height=800)
+
+                slider = gr.Slider(0.5, 3.0, value=1.0, step=0.1, label="缩放倍数")
+                out = gr.HTML()
+            
+                file.change(embed_file, [file, slider], out)
+                slider.change(embed_file, [file, slider], out)
+