update splash add sleep demo

QSplashScreen/GifSplashScreen.py

@@ -14,7 +14,9 @@ __Author__ = 'Irony'
 __Copyright__ = 'Copyright (c) 2020'
 __Version__ = 'Version 1.0'
 
-from PyQt5.QtCore import QTimer, Qt
+from time import sleep
+
+from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QMovie
 from PyQt5.QtWidgets import QApplication, QSplashScreen, QWidget
 
@@ -35,6 +37,20 @@ class GifSplashScreen(QSplashScreen):
         super(GifSplashScreen, self).finish(widget)
 
 
+class BusyWindow(QWidget):
+
+    def __init__(self, *args, **kwargs):
+        super(BusyWindow, self).__init__(*args, **kwargs)
+        # 模拟耗时操作，一般来说耗时的加载数据应该放到线程
+        for i in range(5):
+            sleep(1)
+            splash.showMessage('加载进度: %d' % i, Qt.AlignHCenter | Qt.AlignBottom, Qt.white)
+            QApplication.instance().processEvents()
+
+        splash.showMessage('初始化完成', Qt.AlignHCenter | Qt.AlignBottom, Qt.white)
+        splash.finish(self)
+
+
 if __name__ == '__main__':
     import sys
     import cgitb
@@ -42,23 +58,28 @@ if __name__ == '__main__':
     cgitb.enable(1, None, 5, '')
 
     app = QApplication(sys.argv)
+
+    global splash
     splash = GifSplashScreen()
     splash.show()
 
+    w = BusyWindow()
+    w.show()
 
-    def createWindow():
-        app.w = QWidget()
-        # 模拟初始5秒后再显示
-        splash.showMessage('等待界面显示', Qt.AlignHCenter | Qt.AlignBottom, Qt.white)
-        QTimer.singleShot(3000, lambda: (
-            splash.showMessage('初始化完成', Qt.AlignHCenter | Qt.AlignBottom, Qt.white), app.w.show(),
-            splash.finish(app.w)))
-
+    # 测试二
+    # def createWindow():
+    #     app.w = QWidget()
+    #     # 模拟初始5秒后再显示
+    #     splash.showMessage('等待界面显示', Qt.AlignHCenter | Qt.AlignBottom, Qt.white)
+    #     QTimer.singleShot(3000, lambda: (
+    #         splash.showMessage('初始化完成', Qt.AlignHCenter | Qt.AlignBottom, Qt.white), app.w.show(),
+    #         splash.finish(app.w)))
 
     # 模拟耗时5秒。但是不能用sleep
     # 可以使用子线程加载耗时的数据
     # 主线程中循环设置UI可以配合QApplication.instance().processEvents()
+    # QTimer.singleShot(3000, createWindow)
+
     splash.showMessage('等待创建界面', Qt.AlignHCenter | Qt.AlignBottom, Qt.white)
-    QTimer.singleShot(3000, createWindow)
 
     sys.exit(app.exec_())