Update app.py

app.py

@@ -1,57 +1,30 @@
 # pdf_viewer_app.py
-import base64
-from pathlib import Path
-from typing import Union, BinaryIO
 import gradio as gr
 
 
-def pdf_to_html(
-    pdf: Union[str, Path, bytes, BinaryIO],
-    scale: float = 1.0,
-    height: int = 800,
-) -> str:
-    """把 PDF 转成可嵌入浏览器的 HTML 片段（<iframe> + Blob URL）"""
-    # 读取二进制
-    if isinstance(pdf, (str, Path)):
-        raw = Path(pdf).read_bytes()
-    elif isinstance(pdf, bytes):
-        raw = pdf
-    else:  # file-like
-        raw = pdf.read()
+def render_markdown(text: str):
+    return text or ""
 
-    b64 = base64.b64encode(raw).decode()
-    zoom = int(scale * 100)  # 转百分比
 
-    return f"""
-<div style="width:100%;height:{height}px;">
-  <iframe id="pdf_view" style="width:100%;height:100%;border:none;"></iframe>
-</div>
-<script>
-const bytes = Uint8Array.from(atob("{b64}"), c => c.charCodeAt(0));
-const blob  = new Blob([bytes], {{type:"application/pdf"}});
-const url   = URL.createObjectURL(blob);
-document.getElementById("pdf_view").src = url + "#zoom={zoom}";
-</script>
-"""
+if __name__ == "__main__":
+    with gr.Blocks() as demo:
+        input_md = gr.Textbox(
+            label="Input",
+            placeholder="Type Markdown/LaTeX here...",
+            lines=12,
+        )
+        render_btn = gr.Button("Render", variant="primary")
 
+        md = gr.Markdown(
+            label="Markdown rendering",
+            show_copy_button=True,
+            line_breaks=True,
+        )
 
-def show_pdf(file_obj, scale):
-    if file_obj is None:
-        return "<p style='color:gray'>请先上传 PDF 文件</p>"
-    return pdf_to_html(file_obj, scale)
+        render_btn.click(
+            fn=render_markdown,
+            inputs=input_md,
+            outputs=md,
+        )
 
-
-with gr.Blocks(title="自定义 PDF 预览") as demo:
-    gr.Markdown("## 📄 PDF 预览 Demo（Blob URL + iframe）")
-
-    with gr.Row():
-        uploader = gr.File(label="上传 PDF", file_types=[".pdf"])
-        zoom = gr.Slider(0.5, 3, value=1, step=0.1, label="缩放倍数")
-
-    html_out = gr.HTML()  # 关闭净化，允许 <script>
-
-    # 事件绑定
-    uploader.change(show_pdf, [uploader, zoom], html_out)
-    zoom.change(show_pdf, [uploader, zoom], html_out)
-
-demo.launch()
+    demo.launch()