blocks|key|4181337|text|试试看：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4181338|#from+PyQt4.QtCore+import+*+
#from+PyQt4.QtGui+import+*+
import+sys
from+PyQt5.QtWidgets+import+*
from+PyQt5.QtCore++++import+*
from+PyQt5.QtGui+++++import+*+


class+MyWindow(QWidget):+
++++def+__init__(self,+*args):+
++++++++QWidget.__init__(self,+*args)

++++++++#+create+objects
++++++++self.la++=+QLabel("Press+Space+or+`w`+in+this+box:")
++++++++self.le++=+MyLineEdit()
++++++++self.la2+=+QLabel("\nLook+here:")
++++++++self.le2+=+QLineEdit()

++++++++self.btnSpace+=+QPushButton("Button1")
++++++++self.btnSpace.setEnabled(False)
++++++++self.btnSpace.clicked.connect(self.onBtnSpace)
++++++++self.btnW+++++=+QPushButton("Button2")
++++++++self.btnW.setEnabled(False)
++++++++self.btnW.clicked.connect(self.onBtnW)


++++++++#+layout
++++++++layout+=+QVBoxLayout()
++++++++layout.addWidget(self.la)
++++++++layout.addWidget(self.le)
++++++++layout.addWidget(self.la2)
++++++++layout.addWidget(self.le2)

++++++++layout.addWidget(self.btnSpace)
++++++++layout.addWidget(self.btnW)

++++++++self.setLayout(layout)

++++++++#+connections
++++++++#self.connect(self.le,+SIGNAL("tabPressed"),+self.update)
++++++++self.le.signalTabPressed[str].connect(self.update)

++++def+update(self,+keyPressed):
++++++++newtext+=+str(self.le2.text())+%2B+str(keyPressed)++#"tab+pressed+"
++++++++self.le2.setText(newtext)

++++++++if+keyPressed+==+"Key+Space;+":
++++++++++++self.btnSpace.setEnabled(True)
++++++++++++self.btnSpace.setText(str(keyPressed))

++++++++if+keyPressed+==+"Key+W;+":
++++++++++++self.btnW.setEnabled(True)
++++++++++++self.btnW.setText(str(keyPressed))++++++++


++++def+onBtnSpace(self):
++++++++print("keyPressed+->+btnSpace")

++++def+onBtnW(self):
++++++++print("keyPressed+->+btnW")+++++++

class+MyLineEdit(QLineEdit):
++++signalTabPressed+=+pyqtSignal(str)++++++++++++++++++#+%2B%2B%2B

++++def+__init__(self,+*args):
++++++++QLineEdit.__init__(self,+*args)

++++def+event(self,+event):
++++++++#if+(event.type()==QEvent.KeyPress)+and+(event.key()==Qt.Key_Tab):
++++++++if+(event.type()==QEvent.KeyPress)+and+(event.key()==Qt.Key_Space):
++++++++++++self.signalTabPressed.emit("Key+Space;+")
++++++++++++return+True
++++++++if+(event.type()==QEvent.KeyPress)+and+(event.key()==Qt.Key_W):
++++++++++++self.signalTabPressed.emit("Key+W;+")++++
++++++++++++return+True

++++++++return+QLineEdit.event(self,+event)



def+main():+
++++app+=+QApplication(sys.argv)+
++++w+++=+MyWindow()+
++++w.show()+
++++sys.exit(app.exec_())+

if+__name__+==+"__main__":+
++++main()|code-block|syntax|javascript|4181339|​|4181340|📷|atomic|offset|length|4181341|4181342|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/36240c1e0f7575c3b065dd05e4aa37e7.jpeg|imageAlt^0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|10|8|@]|9|@$L|11|M|12|1|13]]|A|$]]|$1|N|3|H|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V|W|-4]]]]

Try it:

<pre><code>#from PyQt4.QtCore import * 
#from PyQt4.QtGui import * 
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import * 


class MyWindow(QWidget): 
 def __init__(self, *args): 
 QWidget.__init__(self, *args)

 # create objects
 self.la = QLabel("Press Space or `w` in this box:")
 self.le = MyLineEdit()
 self.la2 = QLabel("\nLook here:")
 self.le2 = QLineEdit()

 self.btnSpace = QPushButton("Button1")
 self.btnSpace.setEnabled(False)
 self.btnSpace.clicked.connect(self.onBtnSpace)
 self.btnW = QPushButton("Button2")
 self.btnW.setEnabled(False)
 self.btnW.clicked.connect(self.onBtnW)


 # layout
 layout = QVBoxLayout()
 layout.addWidget(self.la)
 layout.addWidget(self.le)
 layout.addWidget(self.la2)
 layout.addWidget(self.le2)

 layout.addWidget(self.btnSpace)
 layout.addWidget(self.btnW)

 self.setLayout(layout)

 # connections
 #self.connect(self.le, SIGNAL("tabPressed"), self.update)
 self.le.signalTabPressed[str].connect(self.update)

 def update(self, keyPressed):
 newtext = str(self.le2.text()) + str(keyPressed) #"tab pressed "
 self.le2.setText(newtext)

 if keyPressed == "Key Space; ":
 self.btnSpace.setEnabled(True)
 self.btnSpace.setText(str(keyPressed))

 if keyPressed == "Key W; ":
 self.btnW.setEnabled(True)
 self.btnW.setText(str(keyPressed)) 


 def onBtnSpace(self):
 print("keyPressed -&gt; btnSpace")

 def onBtnW(self):
 print("keyPressed -&gt; btnW") 

class MyLineEdit(QLineEdit):
 signalTabPressed = pyqtSignal(str) # +++

 def __init__(self, *args):
 QLineEdit.__init__(self, *args)

 def event(self, event):
 #if (event.type()==QEvent.KeyPress) and (event.key()==Qt.Key_Tab):
 if (event.type()==QEvent.KeyPress) and (event.key()==Qt.Key_Space):
 self.signalTabPressed.emit("Key Space; ")
 return True
 if (event.type()==QEvent.KeyPress) and (event.key()==Qt.Key_W):
 self.signalTabPressed.emit("Key W; ") 
 return True

 return QLineEdit.event(self, event)



def main(): 
 app = QApplication(sys.argv) 
 w = MyWindow() 
 w.show() 
 sys.exit(app.exec_()) 

if __name__ == "__main__": 
 main()
</code></pre>

<a href="https://i.stack.imgur.com/NyHeW.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NyHeW.jpg" alt="enter image description here"></a>

blocks|key|4180734|text|有了S.Nick非常有用的答案，我能够找到一个真正符合我需求的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4180735|class+MyPushButton(QPushButton):
++++def+__init__(self,+*args):
++++++++QPushButton.__init__(self,+*args)

++++def+event(self,+event):
++++++++if+(event.type()+==+QEvent.KeyPress)+and+(event.key()+==+Qt.Key_Space):
++++++++++++print(foo)

++++++++++++return+True

++++++++return+QPushButton.event(self,+event)|code-block|syntax|javascript|4180736|所以，就是这样。现在，每当我按下键盘上的空格键时，它只打印foo，而不打印其他任何内容。显然，print(foo)只是我想做的任何事情的占位符。|offset|length|style|CODE|4180737|entityMap^0|0|0|1B|A|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

With S. Nick's very useful answer I were able to come to a solution that really fits my needs.

<pre><code>class MyPushButton(QPushButton):
 def __init__(self, *args):
 QPushButton.__init__(self, *args)

 def event(self, event):
 if (event.type() == QEvent.KeyPress) and (event.key() == Qt.Key_Space):
 print(foo)

 return True

 return QPushButton.event(self, event)
</code></pre>

So, that's it. Whenever I press the space key on my keyboard now it just prints foo and nothing else. Where <code>print(foo)</code> is just a place-holder for whatever I wish to do, obviously.

I made a ui for work using PyQt5 and Python3. Additionally to clicking the buttons, I want to execute specific actions by pressing specific keys on my keyboard e.g. the space bar. I used the following to do so:

<pre><code>def keyPressEvent(self, event):
 key = event.key()

 if key == Qt.Key_Space:
 print('space')
 elif key == Qt.Key_W:
 print('w')
</code></pre>

Instead of printing 'space', it presses the focused button in the ui, when I'm pressing the space bar. Just like I hit return. Although pressing the 'W'-key prints 'w' as expected.

I already searched here at stackoverflow and other where in the web as well, but I found nothing really helpfull. The best I got was this one <a href="https://www.saltycrane.com/blog/2008/01/how-to-capture-tab-key-press-event-with/" rel="nofollow noreferrer">here</a>. But it's using PyQt4.3 and copy and paste the code to my editor just brought me some errors. I thought the approach was a good one, but I were not able to transfer this to PyQt5.

How to change space bar behaviour in PyQt5, Python3

我使用PyQt5和Python3制作了一个工作ui。除了单击按钮之外，我还想通过按键盘上的特定键(如空格键)执行特定操作。我使用以下方法来完成此操作：def keyPressEvent(self, event):    key = event.key()    if key == Qt.Key_Space:      ...

问如何在PyQt5、Python3中更改空格键行为
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