T-573 修复封面画廊候选图宽度

app/gui/tabs/generate.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from PySide6.QtCore import QEvent
+from PySide6.QtCore import QEvent, QSize
 
 from ..models import GenerateTaskTableModel
 from ..widgets import *
@@ -188,13 +188,14 @@ class CoverGalleryDialog(QDialog):
         self.status_label.setWordWrap(True)
         layout.addWidget(self.status_label)
 
-        scroll = QScrollArea()
-        scroll.setObjectName("coverGalleryScrollArea")
-        scroll.setWidgetResizable(False)
-        scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
-        scroll.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
-        content = QWidget()
-        self.candidate_layout = QHBoxLayout(content)
+        self.candidate_scroll = QScrollArea()
+        self.candidate_scroll.setObjectName("coverGalleryScrollArea")
+        self.candidate_scroll.setWidgetResizable(False)
+        self.candidate_scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
+        self.candidate_scroll.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
+        self.candidate_content = QWidget()
+        self.candidate_content.setObjectName("coverGalleryCandidateContent")
+        self.candidate_layout = QHBoxLayout(self.candidate_content)
         self.candidate_layout.setContentsMargins(0, 0, 0, 0)
         self.candidate_layout.setSpacing(12)
         if self.candidates:
@@ -207,8 +208,9 @@ class CoverGalleryDialog(QDialog):
             empty_label.setMinimumSize(320, self.THUMBNAIL_SIZE)
             empty_label.setAlignment(Qt.AlignCenter)
             self.candidate_layout.addWidget(empty_label)
-        scroll.setWidget(content)
-        layout.addWidget(scroll, 1)
+        self._sync_candidate_content_size()
+        self.candidate_scroll.setWidget(self.candidate_content)
+        layout.addWidget(self.candidate_scroll, 1)
         return panel
 
     def _candidate_item(self, candidate_path, index):
@@ -252,6 +254,38 @@ class CoverGalleryDialog(QDialog):
         layout.addStretch(1)
         return item
 
+    def _sync_candidate_content_size(self):
+        layout = getattr(self, "candidate_layout", None)
+        content = getattr(self, "candidate_content", None)
+        if layout is None or content is None:
+            return
+        layout.activate()
+        margins = layout.contentsMargins()
+        spacing = max(0, layout.spacing())
+        hint = layout.sizeHint()
+        if self.candidates:
+            candidate_count = len(self.candidates)
+            min_width = (
+                margins.left()
+                + margins.right()
+                + candidate_count * (self.THUMBNAIL_SIZE + 16)
+                + max(0, candidate_count - 1) * spacing
+            )
+        else:
+            min_width = margins.left() + margins.right() + 320
+        min_height = max(
+            self.THUMBNAIL_SIZE,
+            hint.height(),
+            content.minimumHeight(),
+        )
+        size = QSize(max(min_width, hint.width()), min_height)
+        content.setMinimumSize(size)
+        content.resize(size)
+        content.updateGeometry()
+        scroll = getattr(self, "candidate_scroll", None)
+        if scroll is not None:
+            scroll.updateGeometry()
+
     def _sync_initial_selection(self):
         for candidate_path, radio in self.candidate_buttons.items():
             if _same_file(candidate_path, self.current_path):
@@ -560,6 +594,7 @@ class CoverGalleryDialog(QDialog):
             empty_label.setMinimumSize(320, self.THUMBNAIL_SIZE)
             empty_label.setAlignment(Qt.AlignCenter)
             self.candidate_layout.addWidget(empty_label)
+        self._sync_candidate_content_size()
         self._install_navigation_event_filters()
 
     def _on_regenerate_progress(self, payload):