QGraphicsTextItem 接收按键

Question

import sys
import random
from PySide2 import QtCore, QtWidgets, QtGui
# IN PROCESS
class MainWindow(QtWidgets.QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
# IN PROCESS
class SceneLabel(QtWidgets.QGraphicsTextItem):
def __init__(self,text):
super(SceneLabel, self).__init__(text)
self.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable)
self.hasFocus = False
def mouseDoubleClickEvent(self, event):
print("FROM LABEL")
self.hasFocus = True
def keyPressEvent(self,event):
if(self.hasFocus==True):
print(event.key())
class MainView(QtWidgets.QGraphicsView):
def __init__(self, parent=None):
super(MainView, self).__init__(parent)
def keyPressEvent(self, event):
pass
# print(event.key())
class MainScene(QtWidgets.QGraphicsScene):
def __init__(self, parent=None):
super(MainScene, self).__init__(parent)
self.inLabel = False
def keyPressEvent(self, event):
print(event.key())
class MyWidget(QtWidgets.QWidget):
def __init__(self):
super().__init__()
self.scene = MainScene()
# self.st = self.scene.addText("Hello, world!")
self.st = self.scene.addItem(SceneLabel("Hello, world!"))
#self.st.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable)
#self.st.setFlag(QtWidgets.QGraphicsItem.ItemIsSelectable)
#self.st.setFlag(QtWidgets.QGraphicsItem.ItemIsFocusable)
# sl = scene label
# self.scenelabel = QtWidgets.QLineEdit()
# self.scenelabel.setText("A LINE EDIT")
# self.sl = self.scene.addWidget(self.scenelabel)
# self.sl.setFlag(QtWidgets.QGraphicsItem.ItemIsSelectable)
# self.sl.setFlag(QtWidgets.QGraphicsItem.ItemIsFocusable)
# self.sl.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable)

self.view = MainView(self.scene)
self.view.show()
self.layout = QtWidgets.QVBoxLayout()
self.layout.addWidget(self.view)
self.setLayout(self.layout)

if __name__ == "__main__":
app = QtWidgets.QApplication([])
widget = MyWidget()
widget.resize(800, 600)
widget.show()
sys.exit(app.exec_())

我正在尝试使QGraphicsTextItem后代可以接收按键事件，以便在我双击它(然后它具有焦点(后，它可以修改自己的文本。

似乎我的QGraphicsView正在吃掉我的按键事件！有没有办法解决这个问题，或者我必须在QGraphicsView中处理它？

Answer 1

不要重新发明轮子，因为 QGraphicsTextItem 已经通过启用Qt::TextEditable标志实现了可使用 click 事件进行编辑的功能：

from PySide2 import QtCore, QtGui, QtWidgets 

class SceneLabel(QtWidgets.QGraphicsTextItem):
def __init__(self, text, parent=None):
super().__init__(text, parent)
self.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable)
self.setTextInteractionFlags(QtCore.Qt.TextEditable)

class MainView(QtWidgets.QGraphicsView):
pass

class MainScene(QtWidgets.QGraphicsScene):
pass

class MyWidget(QtWidgets.QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.scene = MainScene(self)
self.st = SceneLabel("Hello, world!")
self.scene.addItem(self.st)
self.view = MainView(self.scene)
layout = QtWidgets.QVBoxLayout(self)
layout.addWidget(self.view)

if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
widget = MyWidget()
widget.resize(800, 600)
widget.show()
sys.exit(app.exec_())