refactor(gui): 提取窗口居中逻辑至 CenterOnParentMixin，消除5处重复 showEvent

2026-06-22 01:13:02 +08:00 · 2026-06-19 10:20:35 +08:00
parent 5552af1345
commit 88a74a7a47
6 changed files with 68 additions and 128 deletions
@@ -0,0 +1,49 @@
+# -*- coding: utf-8 -*-
+"""
+Copyright (c) 2026 KenanZhu.
+All rights reserved.
+
+This software is provided "as is", without any warranty of any kind.
+You may use, modify, and distribute this file under the terms of the MIT License.
+See the LICENSE file for details.
+"""
+from PySide6.QtGui import QShowEvent
+
+
+class CenterOnParentMixin:
+    """
+        Mixin that centres the widget relative to its parent on first show,
+        clamping the position to the screen bounds.
+
+        Usage::
+
+            class MyWidget(CenterOnParentMixin, QWidget, Ui_MyWidget):
+                pass
+
+            class MyDialog(CenterOnParentMixin, QDialog):
+                pass
+
+        The mixin must appear **before** QWidget / QDialog in the base list
+        so that ``super().showEvent(event)`` resolves up the MRO correctly.
+    """
+
+    def showEvent(
+        self,
+        event: QShowEvent
+    ):
+
+        super().showEvent(event)
+        if self.parent():
+            screen_rect = self.screen().geometry()
+            target_pos = self.parent().geometry().center()
+            target_pos.setX(target_pos.x() - self.width() // 2)
+            target_pos.setY(target_pos.y() - self.height() // 2)
+            if target_pos.x() < 0:
+                target_pos.setX(0)
+            if target_pos.x() + self.width() > screen_rect.width():
+                target_pos.setX(screen_rect.width() - self.width())
+            if target_pos.y() < 0:
+                target_pos.setY(0)
+            if target_pos.y() + self.height() > screen_rect.height():
+                target_pos.setY(screen_rect.height() - self.height())
+            self.move(target_pos)