Python、Pyqt5でQLineEditにカーソルが当たった時のイベントを取得したい

Python3.7 Pyqt5で作成したlineEditがあり、それぞれに1番、2番、3番の入力欄を作りました。
例えば1番のlineEditにカーソルが当たった場合、下のラベルに「1番を入力中です。」と表示させたいです。
ご教授お願いいたします。

python
1from PyQt5 import QtCore, QtGui, QtWidgets
2
3class Ui_MainWindow(object):
4    def setupUi(self, MainWindow):
5        MainWindow.setObjectName("MainWindow")
6        MainWindow.resize(256, 267)
7        self.centralwidget = QtWidgets.QWidget(MainWindow)
8        self.centralwidget.setObjectName("centralwidget")
9        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
10        self.lineEdit.setGeometry(QtCore.QRect(70, 60, 113, 20))
11        self.lineEdit.setObjectName("lineEdit")
12        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
13        self.lineEdit_2.setGeometry(QtCore.QRect(70, 90, 113, 20))
14        self.lineEdit_2.setObjectName("lineEdit_2")
15        self.lineEdit_3 = QtWidgets.QLineEdit(self.centralwidget)
16        self.lineEdit_3.setGeometry(QtCore.QRect(70, 120, 113, 20))
17        self.lineEdit_3.setObjectName("lineEdit_3")
18        self.label = QtWidgets.QLabel(self.centralwidget)
19        self.label.setGeometry(QtCore.QRect(40, 60, 30, 16))
20        self.label.setObjectName("label")
21        self.label_2 = QtWidgets.QLabel(self.centralwidget)
22        self.label_2.setGeometry(QtCore.QRect(40, 90, 30, 16))
23        self.label_2.setObjectName("label_2")
24        self.label_3 = QtWidgets.QLabel(self.centralwidget)
25        self.label_3.setGeometry(QtCore.QRect(40, 120, 30, 16))
26        self.label_3.setObjectName("label_3")
27        self.label_4 = QtWidgets.QLabel(self.centralwidget)
28        self.label_4.setGeometry(QtCore.QRect(50, 160, 140, 30))
29        font = QtGui.QFont()
30        font.setPointSize(12)
31        self.label_4.setFont(font)
32        self.label_4.setObjectName("label_4")
33        MainWindow.setCentralWidget(self.centralwidget)
34        self.menubar = QtWidgets.QMenuBar(MainWindow)
35        self.menubar.setGeometry(QtCore.QRect(0, 0, 256, 21))
36        self.menubar.setObjectName("menubar")
37        MainWindow.setMenuBar(self.menubar)
38        self.statusbar = QtWidgets.QStatusBar(MainWindow)
39        self.statusbar.setObjectName("statusbar")
40        MainWindow.setStatusBar(self.statusbar)
41
42        self.retranslateUi(MainWindow)
43        QtCore.QMetaObject.connectSlotsByName(MainWindow)
44
45    def retranslateUi(self, MainWindow):
46        _translate = QtCore.QCoreApplication.translate
47        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
48        self.label.setText(_translate("MainWindow", "１番"))
49        self.label_2.setText(_translate("MainWindow", "２番"))
50        self.label_3.setText(_translate("MainWindow", "３番"))
51        self.label_4.setText(_translate("MainWindow", "〇番を入力中です。"))
52
53
54if __name__ == "__main__":
55    import sys
56    app = QtWidgets.QApplication(sys.argv)
57    MainWindow = QtWidgets.QMainWindow()
58    ui = Ui_MainWindow()
59    ui.setupUi(MainWindow)
60    MainWindow.show()
61    sys.exit(app.exec_())
62

行動規範の内容に同意します

回答1件

ベストアンサー

こんな感じでしょうか

Python
1from PyQt5 import QtCore, QtGui, QtWidgets
2
3
4class MyQLineEdit(QtWidgets.QLineEdit):
5    focusIn = QtCore.pyqtSignal()
6
7    def focusInEvent(self, event):
8        super(MyQLineEdit, self).focusInEvent(event)
9        self.focusIn.emit()
10
11class MyMainWindow(QtWidgets.QMainWindow):
12    def setupUi(self):
13        self.setObjectName("MainWindow")
14        self.resize(256, 267)
15        self.centralwidget = QtWidgets.QWidget(self)
16        self.centralwidget.setObjectName("centralwidget")
17        self.lineEdit = MyQLineEdit(self.centralwidget)
18        self.lineEdit.setGeometry(QtCore.QRect(70, 60, 113, 20))
19        self.lineEdit.setObjectName("lineEdit")
20        self.lineEdit_2 = MyQLineEdit(self.centralwidget)
21        self.lineEdit_2.setGeometry(QtCore.QRect(70, 90, 113, 20))
22        self.lineEdit_2.setObjectName("lineEdit_2")
23        self.lineEdit_3 = MyQLineEdit(self.centralwidget)
24        self.lineEdit_3.setGeometry(QtCore.QRect(70, 120, 113, 20))
25        self.lineEdit_3.setObjectName("lineEdit_3")
26        self.label = QtWidgets.QLabel(self.centralwidget)
27        self.label.setGeometry(QtCore.QRect(40, 60, 30, 16))
28        self.label.setObjectName("label")
29        self.label_2 = QtWidgets.QLabel(self.centralwidget)
30        self.label_2.setGeometry(QtCore.QRect(40, 90, 30, 16))
31        self.label_2.setObjectName("label_2")
32        self.label_3 = QtWidgets.QLabel(self.centralwidget)
33        self.label_3.setGeometry(QtCore.QRect(40, 120, 30, 16))
34        self.label_3.setObjectName("label_3")
35        self.label_4 = QtWidgets.QLabel(self.centralwidget)
36        self.label_4.setGeometry(QtCore.QRect(40, 150, 170, 30))
37        font = QtGui.QFont()
38        font.setPointSize(9)
39        self.label_4.setFont(font)
40        self.label_4.setObjectName("label_4")
41        self.setCentralWidget(self.centralwidget)
42        self.menubar = QtWidgets.QMenuBar(self)
43        self.menubar.setGeometry(QtCore.QRect(0, 0, 256, 21))
44        self.menubar.setObjectName("menubar")
45        self.setMenuBar(self.menubar)
46        self.statusbar = QtWidgets.QStatusBar(self)
47        self.statusbar.setObjectName("statusbar")
48        self.setStatusBar(self.statusbar)
49
50        self.retranslateUi()
51        QtCore.QMetaObject.connectSlotsByName(self)
52
53    def retranslateUi(self):
54        _translate = QtCore.QCoreApplication.translate
55        self.setWindowTitle(_translate("MainWindow", "MainWindow"))
56        self.label.setText(_translate("MainWindow", "１番"))
57        self.label_2.setText(_translate("MainWindow", "２番"))
58        self.label_3.setText(_translate("MainWindow", "３番"))
59        self.label_4.setText(_translate("MainWindow", "〇番を入力中です。"))
60
61    def on_lineEdit_focusIn(self):
62        _translate = QtCore.QCoreApplication.translate
63        self.label_4.setText(_translate("MainWindow", "１番を入力中です。"))
64
65    def on_lineEdit_2_focusIn(self):
66        _translate = QtCore.QCoreApplication.translate
67        self.label_4.setText(_translate("MainWindow", "２番を入力中です。"))
68
69    def on_lineEdit_3_focusIn(self):
70        _translate = QtCore.QCoreApplication.translate
71        self.label_4.setText(_translate("MainWindow", "３番を入力中です。"))
72
73if __name__ == "__main__":
74    import sys
75    app = QtWidgets.QApplication(sys.argv)
76    MainWindow = MyMainWindow()
77    MainWindow.setupUi()
78    MainWindow.show()
79    sys.exit(app.exec_())

ポイントとなるのは
・LineEditにフォーカスが移った時に"focusIn"シグナルを発生させるクラスをQLineEditを拡張して作る。（ソースコード上はMyQLineEdit）
・LineEditは独自に定義したクラスで生成する。
・スロット実装の前提としてclass Ui_MainWindow(object)をclass MyMainWindow(QtWidgets.QMainWindow)に変える。ついでに影響のあるところを修正。
・スロットを実装する。（ソースコード上はon_lineEdit_focusIn、on_lineEdit_2_focusIn、on_lineEdit_3_focusIn）

投稿2019/10/16 11:12