按下Enter键时,PyQt QLineEdit散焦

时间:2019-03-03 13:18:22

标签: python pyqt focus qlineedit

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
def pressenter():
   print ("Enter pressed")
def window():
   app = QApplication(sys.argv)
   win = QWidget()

   editbox = QLineEdit()
   editbox.setValidator(QDoubleValidator(0.99,99.99,2))

   eform  = QFormLayout()
   eform.addRow("Enter text: ",editbox)

   editbox.editingFinished.connect(pressenter)
   win.setLayout(eform)
   win.setWindowTitle("My Test Window")
   win.show()

   sys.exit(app.exec_())
if __name__ == '__main__':
   window()

我有一个简单的编辑框,当我按Enter键时我希望光标退出编辑框,这样我就知道我的输入被接受了。这意味着当我想再次编辑时,我特别需要再次选择编辑框。我尝试搜索这个问题,但是我不是英语天生的人,也许这是我的问题,但是我找不到很好的答案。

我目前注意到两个问题:我需要验证器来防止按回车键,另一个问题是pressenter()函数可能应该执行某些操作,但是我不知道焦点方法会做什么。

1 个答案:

答案 0 :(得分:0)

您可以将焦点设置到主窗口: (仅当输入有效时,焦点才会切换,这是您想要的行为吗?)

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

def pressenter(win):
   win.setFocus()

def window():
   app = QApplication(sys.argv)
   win = QWidget()

   editbox = QLineEdit()
   editbox.setValidator(QDoubleValidator(0.99,99.99,2))

   eform  = QFormLayout()
   eform.addRow("Enter text: ",editbox)

   editbox.editingFinished.connect(lambda: pressenter(win))
   win.setLayout(eform)
   win.setWindowTitle("My Test Window")
   win.show()

   sys.exit(app.exec_())
if __name__ == '__main__':
   window()

如果不接受输入,您还可以在pressenter函数中进行验证并重置编辑框:

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

def pressenter(win, editbox):
    val = QDoubleValidator(0.99,99.99,2)
    if val.validate(editbox.text(),0)[0] == QValidator.Acceptable:
        win.setFocus()
    else:
        editbox.setText('')

def window():
   app = QApplication(sys.argv)
   win = QWidget()

   editbox = QLineEdit()

   eform  = QFormLayout()
   eform.addRow("Enter text: ", editbox)

   editbox.editingFinished.connect(lambda: pressenter(win, editbox))
   win.setLayout(eform)
   win.setWindowTitle("My Test Window")
   win.show()

   sys.exit(app.exec_())
if __name__ == '__main__':
   window()