fix: process pdf once

app.py

@@ -143,7 +143,8 @@ with gr.Blocks() as demo:
 
     with gr.Row():
         with gr.Column(scale=1):
-            selected_image = gr.Image(label="选中的图片", type="filepath")
+            selected_image = gr.State(value=None)  # 使用 gr.State 来存储选中的图片路径
+            preview_image = gr.Image(label="选中的图片", type="filepath")
             got_mode = gr.Dropdown(
                 choices=[
                     "plain texts OCR",
@@ -163,10 +164,11 @@ with gr.Blocks() as demo:
         with gr.Column(scale=2):
             ocr_output = gr.HTML(label="识别结果")
 
-    def select_image(evt: gr.SelectData):
-        return evt.value
+    def select_image(evt: gr.SelectData, gallery):
+        selected = gallery[evt.index]
+        return selected, selected
 
-    image_gallery.select(select_image, None, selected_image)
+    image_gallery.select(select_image, image_gallery, [selected_image, preview_image])
     convert_button.click(convert_pdf_to_images, inputs=[pdf_input], outputs=[gr.Textbox(visible=False), image_gallery])
     ocr_button.click(ocr_process, inputs=[selected_image, got_mode, ocr_color, ocr_box], outputs=ocr_output)