[Add] New pyqt_events snippets

Author: jordiandreu

pyqt_events/example.py

@@ -0,0 +1,41 @@
+
+from PyQt4 import Qt, QtCore, QtGui
+
+class MyLineEdit(QtGui.QLineEdit):
+
+    def __init__(self, *args):
+
+        QtGui.QLineEdit.__init__(self,*args)
+
+        self.last_value = "<value>"
+        self.setStyleSheet("background-color: #aaa;")
+        self.setText(self.last_value)
+
+    def mousePressEvent(self,ev):
+        self.last_value = self.text()
+        self.setStyleSheet("background-color: #fff;")
+        self.setText("")
+
+    def keyPressEvent(self, e):
+        if e.key() == QtCore.Qt.Key_Enter or e.key() == QtCore.Qt.Key_Return:
+           print "Key pressed", e.key()
+           self.checkRestore()
+
+        QtGui.QLineEdit.keyPressEvent(self, e)
+    
+    def focusOutEvent(self, ev):
+        self.checkRestore()
+        QtGui.QLineEdit.focusOutEvent(self, ev)
+
+    def checkRestore(self):
+        if str( self.text() ) == "":
+            self.setText(self.last_value)
+        self.setStyleSheet("background-color: #aaa;")
+
+app = QtGui.QApplication([])
+win = QtGui.QMainWindow()
+but = MyLineEdit()
+win.setCentralWidget(but)
+win.show()
+app.exec_()
+