将一个 QPushButton 与两个 QLineEdits 结合使用，具体取决于最后的焦点
Use one QPushButton with two QLineEdits, depending on last focus
我有一个window，里面有两个QLineEdits。它们是第 1 行和第 2 行。我有一个要按下的 Backspace QPushButton。我想要一些代码，当按下退格键时，这些代码将从所需的 QLineEdit 中删除文本。这个要看当时关注的是哪个。
我知道目前我的代码将退格第 1 行，但是我希望它删除最近获得焦点的任何行编辑（即，如果第 1 行在退格之前被选中，它将退格，如果第 2 行是最后一个焦点, 然后它将退格)。
我认为它需要一个 if 语句或 2，但不确定。如何根据最后一个焦点选择删除哪一行编辑？
from PySide import QtGui, QtCore
from PySide.QtCore import*
from PySide.QtGui import*
class MainWindow(QtGui.QMainWindow): #The Main Window Class Maker
def __init__(self,):
QtGui.QMainWindow.__init__(self)
QtGui.QApplication.setStyle(('cleanlooks'))
mfont = QFont()
mfont.setFamily("BankGothic LT")
mfont.setPointSize(40)
mfont.setBold(True)
xfont = QFont()
xfont.setFamily("BankGothic LT")
xfont.setPointSize(40)
xfont.setLetterSpacing(QFont.AbsoluteSpacing, 15)
self.line1 = QLineEdit("Line 1", self)
self.line1.setFixedSize(460, 65)
self.line1.setFont(xfont)
self.line1.move(10,10)
self.line2 = QLineEdit("Line 2", self)
self.line2.setFixedSize(460, 65)
self.line2.setFont(xfont)
self.line2.move(10,200)
#BackSpace button
back = QPushButton("BackSpace", self)
back.move(100,100)
back.setFixedSize(300,75)
back.setFont(mfont)
back.clicked.connect(self.line1.backspace)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.setWindowTitle("BackSpace")
window.resize(480, 400)
window.setMaximumSize(480,400)
window.setMinimumSize(480,400)
window.show()
sys.exit(app.exec_())
您可以通过使用 editingFinished 信号和一些操作将行编辑连接到您的 backspace 函数来完成此操作。
我将 post 然后是整个代码块，然后解释我在其下方所做的更改。
class MainWindow(QtGui.QMainWindow):
def __init__(self,):
QtGui.QMainWindow.__init__(self)
QtGui.QApplication.setStyle(('cleanlooks'))
mfont = QFont()
mfont.setFamily("BankGothic LT")
mfont.setPointSize(40)
mfont.setBold(True)
xfont = QFont()
xfont.setFamily("BankGothic LT")
xfont.setPointSize(40)
xfont.setLetterSpacing(QFont.AbsoluteSpacing, 15)
self.line1 = QLineEdit("Line 1", self)
self.line1.setFixedSize(460, 65)
self.line1.setFont(xfont)
self.line1.move(10,10)
self.line2 = QLineEdit("Line 2", self)
self.line2.setFixedSize(460, 65)
self.line2.setFont(xfont)
self.line2.move(10,200)
self.recent_line = self.line2
self.previous_line = self.line1
#BackSpace button
self.back = QPushButton("BackSpace", self)
self.back.move(100,100)
self.back.setFixedSize(300,75)
self.back.setFont(mfont)
self.back.clicked.connect(self.recent_line.backspace)
self.line1.editingFinished.connect(self.last_lineedit)
self.line2.editingFinished.connect(self.last_lineedit)
def last_lineedit(self):
if isinstance(self.sender(), QLineEdit):
self.recent_line, self.previous_line = self.previous_line, self.recent_line
self.back.clicked.disconnect(self.previous_line.backspace)
self.back.clicked.connect(self.recent_line.backspace)
我所做的第一个更改是包含两个新变量，以便我们可以跟踪 QLineEdit 最后关注的是哪个：
self.recent_line = self.line2
self.previous_line = self.line1
接下来，我将您的 back 小部件更改为 self.back，因为我们将在 __init__
之外需要它
self.back = QPushButton("BackSpace", self)
self.back.move(100,100)
self.back.setFixedSize(300,75)
self.back.setFont(mfont)
self.back.clicked.connect(self.recent_line.backspace)
然后我们将line1和line2设置为editingFinished信号。
This signal is emitted when the Return or Enter key is pressed or the line edit loses focus.
我们将利用 "loses focus" 部分，因为当按下 self.back 按钮时，QLineEdit 失去了焦点。
最后，我们将了解要跟踪哪个 QLineEdit 在任何给定时间连接到退格键的函数。
def last_lineedit(self):
if isinstance(self.sender(), QLineEdit):
self.recent_line, self.previous_line = self.previous_line, self.recent_line
self.back.clicked.disconnect(self.previous_line.backspace)
self.back.clicked.connect(self.recent_line.backspace)
在这个函数中，我们首先确保只有一个 QLineEdits 正在发送信号（以防万一你将其他东西连接到这个不是 QLineEdit 的信号）。
接下来，我们交换 QLineEdit 最近关注的是：
self.recent_line, self.previous_line = self.previous_line, self.recent_line
然后我们断开与上一条线的连接并连接到新线。最后两行很神奇，它允许您根据最近获得焦点的两行进行删除。这些行也是我们更改为 self.back 而不是将其保留在 back 的原因。 last_lineedit 函数无法访问局部范围的 back。
退格按钮最好不要抢走焦点。这样，插入符号将在具有焦点的行编辑中保持可见，并且用户可以轻松地准确地看到正在发生的事情。这样做也使代码更简单：
back.setFocusPolicy(QtCore.Qt.NoFocus)
back.clicked.connect(self.handleBackspace)
def handleBackspace(self):
widget = QtGui.qApp.focusWidget()
if widget is self.line1 or widget is self.line2:
widget.backspace()
好的，伙计们，所以我一直致力于此，以找到一种有用的情况，人们可以在这种情况下使用这种功能。
假设您正在尝试为触摸屏创建一个登录表单，但您没有安装屏幕键盘，您可以 'create' 一个。这就是预期用途。
我已经对此进行了某种测试，并修复了我看到的所有错误，但是嘿，请随意使用它。我注意到计算器存在大量示例，但键盘或数字键盘输入没有实际示例。享受吧！
from PySide import QtGui, QtCore
from PySide.QtCore import*
from PySide.QtGui import*
class MainWindow(QtGui.QMainWindow): #The Main Window Class Maker
def __init__(self,):
QtGui.QMainWindow.__init__(self)
QtGui.QApplication.setStyle(('cleanlooks'))
U = QLabel("U:", self)
U.move(10,10)
P = QLabel("P:", self)
P.move(10,50)
self.line1 = QLineEdit("", self)
self.line1.move(20,10)
self.line1.setReadOnly(True)
self.line2 = QLineEdit("", self)
self.line2.move(20,50)
self.line2.setReadOnly(True)
self.line2.setEchoMode(QLineEdit.Password)
#PushButtons
back = QPushButton("<", self)
back.move(100,80)
back.setFocusPolicy(QtCore.Qt.NoFocus)
back.setFixedSize(20,20)
one = QPushButton('1', self)
one.move(10,80)
one.setFocusPolicy(QtCore.Qt.NoFocus)
one.setText("1")
one.setFixedSize(20,20)
two = QPushButton('2', self)
two.move(40,80)
two.setFocusPolicy(QtCore.Qt.NoFocus)
two.setFixedSize(20,20)
three = QPushButton('3', self)
three.move(70,80)
three.setFocusPolicy(QtCore.Qt.NoFocus)
three.setFixedSize(20,20)
four = QPushButton('4', self)
four.move(10,110)
four.setFocusPolicy(QtCore.Qt.NoFocus)
four.setFixedSize(20,20)
five = QPushButton('5', self)
five.move(40,110)
five.setFocusPolicy(QtCore.Qt.NoFocus)
five.setFixedSize(20,20)
six = QPushButton('6', self)
six.move(70,110)
six.setFocusPolicy(QtCore.Qt.NoFocus)
six.setFixedSize(20,20)
seven = QPushButton('7', self)
seven.move(10,140)
seven.setFocusPolicy(QtCore.Qt.NoFocus)
seven.setFixedSize(20,20)
eight = QPushButton('8', self)
eight.move(40,140)
eight.setFocusPolicy(QtCore.Qt.NoFocus)
eight.setFixedSize(20,20)
nine = QPushButton('9', self)
nine.move(70,140)
nine.setFocusPolicy(QtCore.Qt.NoFocus)
nine.setFixedSize(20,20)
zero = QPushButton('0', self)
zero.move(100,140)
zero.setFocusPolicy(QtCore.Qt.NoFocus)
zero.setFixedSize(20,20)
enter = QPushButton("E", self)
enter.move(100,110)
enter.setFixedSize(20,20)
enter.setFocusPolicy(QtCore.Qt.NoFocus)
#click Handles
def handleBackspace():
backh = QtGui.qApp.focusWidget()
if backh is self.line1 or backh is self.line2:
backh.backspace()
def handleZero():
zeroh = QtGui.qApp.focusWidget()
if zeroh is self.line1:
zeroh.setText((self.line1.text()+str('0')))
else:
zeroh.setText(self.line2.text()+str('0'))
def handleOne():
oneh = QtGui.qApp.focusWidget()
if oneh is self.line1:
oneh.setText(self.line1.text()+str('1'))
else:
oneh.setText(self.line2.text()+str('1'))
def handleTwo():
twoh = QtGui.qApp.focusWidget()
if twoh is self.line1:
twoh.setText(self.line1.text()+str('2'))
else:
twoh.setText(self.line2.text()+str('2'))
def handleThree():
threeh = QtGui.qApp.focusWidget()
if threeh is self.line1:
threeh.setText(self.line1.text()+str('3'))
else:
threeh.setText(self.line2.text()+str('3'))
def handleFour():
fourh = QtGui.qApp.focusWidget()
if fourh is self.line1:
fourh.setText(self.line1.text()+str('4'))
else:
fourh.setText(self.line2.text()+str('4'))
def handleFive():
fiveh = QtGui.qApp.focusWidget()
if fiveh is self.line1:
fiveh.setText(self.line1.text()+str('5'))
else:
fiveh.setText(self.line2.text()+str('5'))
def handleSix():
sixh = QtGui.qApp.focusWidget()
if sixh is self.line1:
sixh.setText(self.line1.text()+str('6'))
else:
sixh.setText(self.line2.text()+str('6'))
def handleSeven():
sevenh = QtGui.qApp.focusWidget()
if sevenh is self.line1:
sevenh.setText(self.line1.text()+str('7'))
else:
sevenh.setText(self.line2.text()+str('7'))
def handleEight():
eighth = QtGui.qApp.focusWidget()
if eighth is self.line1:
eighth.setText(self.line1.text()+str('8'))
else:
eighth.setText(self.line2.text()+str('8'))
def handleNine():
nineh = QtGui.qApp.focusWidget()
if nineh is self.line1:
nineh.setText(self.line1.text()+str('9'))
else:
nineh.setText(self.line2.text()+str('9'))
#Click Conditions
self.connect(enter, SIGNAL("clicked()"), self.close)
zero.clicked.connect(handleZero)
nine.clicked.connect(handleNine)
eight.clicked.connect(handleEight)
seven.clicked.connect(handleSeven)
six.clicked.connect(handleSix)
five.clicked.connect(handleFive)
four.clicked.connect(handleFour)
three.clicked.connect(handleThree)
two.clicked.connect(handleTwo)
one.clicked.connect(handleOne)
back.clicked.connect(handleBackspace)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.setWindowTitle("LoginWindow")
window.resize(130, 180)
window.setMaximumSize(130, 180)
window.setMinimumSize(130, 180)
window.show()
sys.exit(app.exec_())
我有一个window，里面有两个QLineEdits。它们是第 1 行和第 2 行。我有一个要按下的 Backspace QPushButton。我想要一些代码，当按下退格键时，这些代码将从所需的 QLineEdit 中删除文本。这个要看当时关注的是哪个。
我知道目前我的代码将退格第 1 行，但是我希望它删除最近获得焦点的任何行编辑（即，如果第 1 行在退格之前被选中，它将退格，如果第 2 行是最后一个焦点, 然后它将退格)。
我认为它需要一个 if 语句或 2，但不确定。如何根据最后一个焦点选择删除哪一行编辑？
from PySide import QtGui, QtCore
from PySide.QtCore import*
from PySide.QtGui import*
class MainWindow(QtGui.QMainWindow): #The Main Window Class Maker
def __init__(self,):
QtGui.QMainWindow.__init__(self)
QtGui.QApplication.setStyle(('cleanlooks'))
mfont = QFont()
mfont.setFamily("BankGothic LT")
mfont.setPointSize(40)
mfont.setBold(True)
xfont = QFont()
xfont.setFamily("BankGothic LT")
xfont.setPointSize(40)
xfont.setLetterSpacing(QFont.AbsoluteSpacing, 15)
self.line1 = QLineEdit("Line 1", self)
self.line1.setFixedSize(460, 65)
self.line1.setFont(xfont)
self.line1.move(10,10)
self.line2 = QLineEdit("Line 2", self)
self.line2.setFixedSize(460, 65)
self.line2.setFont(xfont)
self.line2.move(10,200)
#BackSpace button
back = QPushButton("BackSpace", self)
back.move(100,100)
back.setFixedSize(300,75)
back.setFont(mfont)
back.clicked.connect(self.line1.backspace)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.setWindowTitle("BackSpace")
window.resize(480, 400)
window.setMaximumSize(480,400)
window.setMinimumSize(480,400)
window.show()
sys.exit(app.exec_())
您可以通过使用 editingFinished 信号和一些操作将行编辑连接到您的 backspace 函数来完成此操作。
我将 post 然后是整个代码块，然后解释我在其下方所做的更改。
class MainWindow(QtGui.QMainWindow):
def __init__(self,):
QtGui.QMainWindow.__init__(self)
QtGui.QApplication.setStyle(('cleanlooks'))
mfont = QFont()
mfont.setFamily("BankGothic LT")
mfont.setPointSize(40)
mfont.setBold(True)
xfont = QFont()
xfont.setFamily("BankGothic LT")
xfont.setPointSize(40)
xfont.setLetterSpacing(QFont.AbsoluteSpacing, 15)
self.line1 = QLineEdit("Line 1", self)
self.line1.setFixedSize(460, 65)
self.line1.setFont(xfont)
self.line1.move(10,10)
self.line2 = QLineEdit("Line 2", self)
self.line2.setFixedSize(460, 65)
self.line2.setFont(xfont)
self.line2.move(10,200)
self.recent_line = self.line2
self.previous_line = self.line1
#BackSpace button
self.back = QPushButton("BackSpace", self)
self.back.move(100,100)
self.back.setFixedSize(300,75)
self.back.setFont(mfont)
self.back.clicked.connect(self.recent_line.backspace)
self.line1.editingFinished.connect(self.last_lineedit)
self.line2.editingFinished.connect(self.last_lineedit)
def last_lineedit(self):
if isinstance(self.sender(), QLineEdit):
self.recent_line, self.previous_line = self.previous_line, self.recent_line
self.back.clicked.disconnect(self.previous_line.backspace)
self.back.clicked.connect(self.recent_line.backspace)
我所做的第一个更改是包含两个新变量，以便我们可以跟踪 QLineEdit 最后关注的是哪个：
self.recent_line = self.line2
self.previous_line = self.line1
接下来，我将您的 back 小部件更改为 self.back，因为我们将在 __init__
self.back = QPushButton("BackSpace", self)
self.back.move(100,100)
self.back.setFixedSize(300,75)
self.back.setFont(mfont)
self.back.clicked.connect(self.recent_line.backspace)
然后我们将line1和line2设置为editingFinished信号。
This signal is emitted when the Return or Enter key is pressed or the line edit loses focus.
我们将利用 "loses focus" 部分，因为当按下 self.back 按钮时，QLineEdit 失去了焦点。
最后，我们将了解要跟踪哪个 QLineEdit 在任何给定时间连接到退格键的函数。
def last_lineedit(self):
if isinstance(self.sender(), QLineEdit):
self.recent_line, self.previous_line = self.previous_line, self.recent_line
self.back.clicked.disconnect(self.previous_line.backspace)
self.back.clicked.connect(self.recent_line.backspace)
在这个函数中，我们首先确保只有一个 QLineEdits 正在发送信号（以防万一你将其他东西连接到这个不是 QLineEdit 的信号）。
接下来，我们交换 QLineEdit 最近关注的是：
self.recent_line, self.previous_line = self.previous_line, self.recent_line
然后我们断开与上一条线的连接并连接到新线。最后两行很神奇，它允许您根据最近获得焦点的两行进行删除。这些行也是我们更改为 self.back 而不是将其保留在 back 的原因。 last_lineedit 函数无法访问局部范围的 back。
退格按钮最好不要抢走焦点。这样，插入符号将在具有焦点的行编辑中保持可见，并且用户可以轻松地准确地看到正在发生的事情。这样做也使代码更简单：
back.setFocusPolicy(QtCore.Qt.NoFocus)
back.clicked.connect(self.handleBackspace)
def handleBackspace(self):
widget = QtGui.qApp.focusWidget()
if widget is self.line1 or widget is self.line2:
widget.backspace()
好的，伙计们，所以我一直致力于此，以找到一种有用的情况，人们可以在这种情况下使用这种功能。 假设您正在尝试为触摸屏创建一个登录表单，但您没有安装屏幕键盘，您可以 'create' 一个。这就是预期用途。
我已经对此进行了某种测试，并修复了我看到的所有错误，但是嘿，请随意使用它。我注意到计算器存在大量示例，但键盘或数字键盘输入没有实际示例。享受吧！
from PySide import QtGui, QtCore
from PySide.QtCore import*
from PySide.QtGui import*
class MainWindow(QtGui.QMainWindow): #The Main Window Class Maker
def __init__(self,):
QtGui.QMainWindow.__init__(self)
QtGui.QApplication.setStyle(('cleanlooks'))
U = QLabel("U:", self)
U.move(10,10)
P = QLabel("P:", self)
P.move(10,50)
self.line1 = QLineEdit("", self)
self.line1.move(20,10)
self.line1.setReadOnly(True)
self.line2 = QLineEdit("", self)
self.line2.move(20,50)
self.line2.setReadOnly(True)
self.line2.setEchoMode(QLineEdit.Password)
#PushButtons
back = QPushButton("<", self)
back.move(100,80)
back.setFocusPolicy(QtCore.Qt.NoFocus)
back.setFixedSize(20,20)
one = QPushButton('1', self)
one.move(10,80)
one.setFocusPolicy(QtCore.Qt.NoFocus)
one.setText("1")
one.setFixedSize(20,20)
two = QPushButton('2', self)
two.move(40,80)
two.setFocusPolicy(QtCore.Qt.NoFocus)
two.setFixedSize(20,20)
three = QPushButton('3', self)
three.move(70,80)
three.setFocusPolicy(QtCore.Qt.NoFocus)
three.setFixedSize(20,20)
four = QPushButton('4', self)
four.move(10,110)
four.setFocusPolicy(QtCore.Qt.NoFocus)
four.setFixedSize(20,20)
five = QPushButton('5', self)
five.move(40,110)
five.setFocusPolicy(QtCore.Qt.NoFocus)
five.setFixedSize(20,20)
six = QPushButton('6', self)
six.move(70,110)
six.setFocusPolicy(QtCore.Qt.NoFocus)
six.setFixedSize(20,20)
seven = QPushButton('7', self)
seven.move(10,140)
seven.setFocusPolicy(QtCore.Qt.NoFocus)
seven.setFixedSize(20,20)
eight = QPushButton('8', self)
eight.move(40,140)
eight.setFocusPolicy(QtCore.Qt.NoFocus)
eight.setFixedSize(20,20)
nine = QPushButton('9', self)
nine.move(70,140)
nine.setFocusPolicy(QtCore.Qt.NoFocus)
nine.setFixedSize(20,20)
zero = QPushButton('0', self)
zero.move(100,140)
zero.setFocusPolicy(QtCore.Qt.NoFocus)
zero.setFixedSize(20,20)
enter = QPushButton("E", self)
enter.move(100,110)
enter.setFixedSize(20,20)
enter.setFocusPolicy(QtCore.Qt.NoFocus)
#click Handles
def handleBackspace():
backh = QtGui.qApp.focusWidget()
if backh is self.line1 or backh is self.line2:
backh.backspace()
def handleZero():
zeroh = QtGui.qApp.focusWidget()
if zeroh is self.line1:
zeroh.setText((self.line1.text()+str('0')))
else:
zeroh.setText(self.line2.text()+str('0'))
def handleOne():
oneh = QtGui.qApp.focusWidget()
if oneh is self.line1:
oneh.setText(self.line1.text()+str('1'))
else:
oneh.setText(self.line2.text()+str('1'))
def handleTwo():
twoh = QtGui.qApp.focusWidget()
if twoh is self.line1:
twoh.setText(self.line1.text()+str('2'))
else:
twoh.setText(self.line2.text()+str('2'))
def handleThree():
threeh = QtGui.qApp.focusWidget()
if threeh is self.line1:
threeh.setText(self.line1.text()+str('3'))
else:
threeh.setText(self.line2.text()+str('3'))
def handleFour():
fourh = QtGui.qApp.focusWidget()
if fourh is self.line1:
fourh.setText(self.line1.text()+str('4'))
else:
fourh.setText(self.line2.text()+str('4'))
def handleFive():
fiveh = QtGui.qApp.focusWidget()
if fiveh is self.line1:
fiveh.setText(self.line1.text()+str('5'))
else:
fiveh.setText(self.line2.text()+str('5'))
def handleSix():
sixh = QtGui.qApp.focusWidget()
if sixh is self.line1:
sixh.setText(self.line1.text()+str('6'))
else:
sixh.setText(self.line2.text()+str('6'))
def handleSeven():
sevenh = QtGui.qApp.focusWidget()
if sevenh is self.line1:
sevenh.setText(self.line1.text()+str('7'))
else:
sevenh.setText(self.line2.text()+str('7'))
def handleEight():
eighth = QtGui.qApp.focusWidget()
if eighth is self.line1:
eighth.setText(self.line1.text()+str('8'))
else:
eighth.setText(self.line2.text()+str('8'))
def handleNine():
nineh = QtGui.qApp.focusWidget()
if nineh is self.line1:
nineh.setText(self.line1.text()+str('9'))
else:
nineh.setText(self.line2.text()+str('9'))
#Click Conditions
self.connect(enter, SIGNAL("clicked()"), self.close)
zero.clicked.connect(handleZero)
nine.clicked.connect(handleNine)
eight.clicked.connect(handleEight)
seven.clicked.connect(handleSeven)
six.clicked.connect(handleSix)
five.clicked.connect(handleFive)
four.clicked.connect(handleFour)
three.clicked.connect(handleThree)
two.clicked.connect(handleTwo)
one.clicked.connect(handleOne)
back.clicked.connect(handleBackspace)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.setWindowTitle("LoginWindow")
window.resize(130, 180)
window.setMaximumSize(130, 180)
window.setMinimumSize(130, 180)
window.show()
sys.exit(app.exec_())