调整窗口显示边框

.settings/org.eclipse.core.resources.prefs

@@ -14,6 +14,7 @@ encoding//Demo/ProbeWindow.py=utf-8
 encoding//Demo/QtThreading.py=utf-8
 encoding//Demo/RestartWindow.py=utf-8
 encoding//Demo/SharedMemory.py=utf-8
+encoding//Demo/ShowFrameWhenDrag.py=utf-8
 encoding//Demo/SingleApplication.py=utf-8
 encoding//Demo/VerificationCode.py=utf-8
 encoding//Demo/WeltHideWindow.py=utf-8

Demo/README.md

@@ -18,6 +18,7 @@
   - [使用Threading](#16、使用Threading)
   - [背景连线动画](#17、背景连线动画)
   - [无边框圆角对话框](#18、无边框圆角对话框)
+  - [调整窗口显示边框](#19、调整窗口显示边框)
 
 ## 1、重启窗口Widget
 [运行 RestartWindow.py](RestartWindow.py)
@@ -182,3 +183,15 @@ PyQt 结合 Opencv 进行人脸检测；
 3. 在QWidget中放置其他内容
 
 ![FramelessDialog](ScreenShot/FramelessDialog.png)
+
+## 19、调整窗口显示边框
+[运行 ShowFrameWhenDrag.py](ShowFrameWhenDrag.py)
+
+1. 全局设置是【】在控制面板中->调整Windows的外观和性能->去掉勾选 拖动时显示窗口内容】
+2. 但是为了不影响其它应用,可以在窗口处理函数wndproc中对其进行判断处理
+3. 必须先要替换wndproc为自己的函数
+4. 当消息事件==WM_NCLBUTTONDOWN的时候, 先强制开启，然后处理完成后再还原
+
+好处在于可以减少窗口更新的次数（用途有频繁渲染的界面）
+
+![ShowFrameWhenDrag](ScreenShot/ShowFrameWhenDrag.gif)

Demo/ShowFrameWhenDrag.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2019年4月23日
+@author: Irony
+@site: https://pyqt5.com https://github.com/892768447
+@email: 892768447@qq.com
+@file: ShowFrameWhenDrag
+@description: 调整窗口显示边框
+"""
+from ctypes import sizeof, windll, c_int, byref, c_long, c_void_p, c_ulong, c_longlong,\
+    c_ulonglong, WINFUNCTYPE, c_uint
+
+from PyQt5.QtWidgets import QWidget, QVBoxLayout, QLabel
+
+
+__Author__ = 'Irony'
+__Copyright__ = 'Copyright (c) 2019 Irony'
+__Version__ = 1.0
+
+if sizeof(c_long) == sizeof(c_void_p):
+    WPARAM = c_ulong
+    LPARAM = c_long
+elif sizeof(c_longlong) == sizeof(c_void_p):
+    WPARAM = c_ulonglong
+    LPARAM = c_longlong
+
+WM_NCLBUTTONDOWN = 0x00a1
+GWL_WNDPROC = -4
+SPI_GETDRAGFULLWINDOWS = 38
+SPI_SETDRAGFULLWINDOWS = 37
+WNDPROC = WINFUNCTYPE(c_long, c_void_p, c_uint, WPARAM, LPARAM)
+
+try:
+    CallWindowProc = windll.user32.CallWindowProcW
+    SetWindowLong = windll.user32.SetWindowLongW
+    SystemParametersInfo = windll.user32.SystemParametersInfoW
+except:
+    CallWindowProc = windll.user32.CallWindowProcA
+    SetWindowLong = windll.user32.SetWindowLongA
+    SystemParametersInfo = windll.user32.SystemParametersInfoA
+
+
+def GetDragFullwindows():
+    rv = c_int()
+    SystemParametersInfo(SPI_GETDRAGFULLWINDOWS, 0, byref(rv), 0)
+    return rv.value
+
+
+def SetDragFullwindows(value):
+    SystemParametersInfo(SPI_SETDRAGFULLWINDOWS, value, 0, 0)
+
+
+class Window(QWidget):
+
+    def __init__(self, *args, **kwargs):
+        super(Window, self).__init__(*args, **kwargs)
+        layout = QVBoxLayout(self)
+        layout.addWidget(QLabel('拖动或者调整窗口试试看'))
+
+        # 重点替换窗口处理过程
+        self._newwndproc = WNDPROC(self._wndproc)
+        self._oldwndproc = SetWindowLong(
+            int(self.winId()), GWL_WNDPROC, self._newwndproc)
+
+    def _wndproc(self, hwnd, msg, wparam, lparam):
+        if msg == WM_NCLBUTTONDOWN:
+            # 获取系统本身是否已经开启
+            isDragFullWindow = GetDragFullwindows()
+            if isDragFullWindow != 0:
+                # 开启虚线框
+                SetDragFullwindows(0)
+                # 系统本身处理
+                ret = CallWindowProc(
+                    self._oldwndproc, hwnd, msg, wparam, lparam)
+                # 关闭虚线框
+                SetDragFullwindows(1)
+                return ret
+        return CallWindowProc(self._oldwndproc, hwnd, msg, wparam, lparam)
+
+
+if __name__ == '__main__':
+    import sys
+    from PyQt5.QtWidgets import QApplication
+    app = QApplication(sys.argv)
+    w = Window()
+    w.show()
+    sys.exit(app.exec_())

README.md

@@ -167,6 +167,7 @@ https://pyqt5.com 社区是专门针对PyQt5学习和提升开设的博客网站
   - [简单的窗口贴边隐藏](Demo/WeltHideWindow.py)
   - [嵌入外部窗口](Demo/EmbedWindow.py)
   - [简单跟随其它窗口](Demo/FollowWindow.py)
+  - [调整窗口显示边框](Demo/ShowFrameWhenDrag.py)
   - [简单探测窗口和放大截图](Demo/ProbeWindow.py)
   - [无边框圆角对话框](Demo/FramelessDialog.py)
   - [无边框自定义标题栏窗口](Demo/FramelessWindow.py)