[英]binding a signal to QListWidget items
如何确保单击 QListWidget 项会打开 QFrame 中的相应小部件,并且在这些小部件中输入的数据在切换列表项之间保存?
class Window(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
vbox = QVBoxLayout()
tab_widget = QTabWidget()
tab_widget.setStyleSheet('background-color:gainsboro')
tab_widget.addTab(Setup(), "setup")
vbox.addWidget(tab_widget)
self.setLayout(vbox)
class Setup(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
hbox = QHBoxLayout()
splitter = QSplitter(Qt.Horizontal)
self.list = QListWidget()
self.list.setStyleSheet("background-color:white")
QListWidgetItem("vertices", self.list)
QListWidgetItem("blocks", self.list)
self.list.itemClicked.connect(self.conv_met)
splitter.addWidget(self.list)
self.frame = QFrame()
self.frame.setFrameShape(QFrame.StyledPanel)
self.frame.setLineWidth(0.6)
splitter.addWidget(self.frame)
hbox.addWidget(splitter)
self.setLayout(hbox)
self.show()
def conv_met(self, item):
if item.text() == "vertices":
convertToMeters_layout = QHBoxLayout()
convertToMeters_lbl = QLabel("convertToMeters")
convertToMeters_val = QLineEdit("0.1")
convertToMeters_layout.addWidget(convertToMeters_lbl)
convertToMeters_layout.addWidget(convertToMeters_val)
self.frame.setLayout(convertToMeters_layout)
if item.text() == "blocks":
block_grad_layout = QGridLayout()
hexx = QComboBox(self)
hexx.addItems(["hex"])
ver_labels = QLineEdit("0 1 2 3 4 5 6 7")
block_grad_layout.addWidget(hexx, 0, 0)
block_grad_layout.addWidget(ver_labels, 0, 1)
self.frame.setLayout(block_grad_layout)
if __name__ == '__main__':
app = QApplication(sys.argv)
main_win = Window()
main_win.show()
sys.exit(app.exec_())
为了保留项目的数据,您可以使用setData(role, value)
来存储以前输入的数据,然后再更改为新的当前项目。
请注意,您不应多次使用setLayout()
; 事实上,由于这个原因,您的示例无法按预期工作,如果您从 shell 或命令提示符运行它,您可能会看到错误消息:
QWidget::setLayout: Attempting to set QLayout "" on QFrame "", which already has a layout
为了实现您想要的,解决方案是使用QStackedWidget ,它的工作方式几乎像 QTabWidget,但没有标签栏来在“页面”之间切换,因为它们只能使用setCurrentIndex()
或setCurrentWidget()
以编程方式更改.
class Setup(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
hbox = QHBoxLayout()
splitter = QSplitter(Qt.Horizontal)
self.list = QListWidget()
self.list.setStyleSheet("background-color:white")
self.verticesItem = QListWidgetItem("vertices", self.list)
self.blocksItem = QListWidgetItem("blocks", self.list)
self.list.itemClicked.connect(self.conv_met)
splitter.addWidget(self.list)
self.frame = QFrame()
self.frame.setFrameShape(QFrame.StyledPanel)
self.frame.setLineWidth(0.6)
frameLayout = QVBoxLayout(self.frame)
self.stackedWidget = QStackedWidget()
frameLayout.addWidget(self.stackedWidget)
self.convertToMeters_widget = QWidget()
self.stackedWidget.addWidget(self.convertToMeters_widget)
convertToMeters_layout = QHBoxLayout(self.convertToMeters_widget)
convertToMeters_lbl = QLabel("convertToMeters")
self.convertToMeters_val = QLineEdit("0.1")
convertToMeters_layout.addWidget(convertToMeters_lbl)
convertToMeters_layout.addWidget(self.convertToMeters_val)
self.block_grad_widget = QWidget()
self.stackedWidget.addWidget(self.block_grad_widget)
block_grad_layout = QGridLayout(self.block_grad_widget)
hexx = QComboBox()
hexx.addItems(["hex"])
self.ver_labels = QLineEdit("0 1 2 3 4 5 6 7")
block_grad_layout.addWidget(hexx, 0, 0)
block_grad_layout.addWidget(self.ver_labels, 0, 1)
splitter.addWidget(self.frame)
hbox.addWidget(splitter)
self.setLayout(hbox)
self.currentItem = None
def conv_met(self, item):
if self.currentItem:
if self.currentItem == self.verticesItem:
self.currentItem.setData(Qt.UserRole, self.convertToMeters_val.text())
else:
self.currentItem.setData(Qt.UserRole, self.ver_labels.text())
if item == self.currentItem:
return
self.currentItem = item
if item == self.verticesItem:
self.stackedWidget.setCurrentWidget(self.convertToMeters_widget)
self.convertToMeters_val.setText(item.data(Qt.UserRole) or '0.1')
elif item == self.blocksItem:
self.stackedWidget.setCurrentWidget(self.block_grad_widget)
self.ver_labels.setText(item.data(Qt.UserRole) or '0 1 2 3 4 5 6 7')
请注意,如果您想存储“顶点”的数值,您可能更喜欢使用 QSpinBox(或 QDoubleSpinBox 用于浮点数)。 同样,如果您只需要十六进制值,最好设置一个inputMask或添加一个验证器以确保输入的值是有效的。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.