Qtable在 table 出现之前查看占位符文本
QtableView placeholder text before table appears
我有一个非常简单的 QtableView,它是在程序运行后填充的。该程序需要几秒钟才能像这样填充 table..
我想知道如何在程序运行之前在 QTableView 上启用占位符文本“无数据”...
您必须覆盖 paintEvent 方法,在该方法中检查是否没有模型或模型是否没有行,然后绘制占位符文本:
from PySide2 import QtCore, QtGui, QtWidgets
class TableView(QtWidgets.QTableView):
def paintEvent(self, event):
super().paintEvent(event)
if self.model() is not None and self.model().rowCount() > 0:
return
painter = QtGui.QPainter(self.viewport())
painter.save()
col = self.palette().placeholderText().color()
painter.setPen(col)
fm = self.fontMetrics()
elided_text = fm.elidedText(
"No data", QtCore.Qt.ElideRight, self.viewport().width()
)
painter.drawText(self.viewport().rect(), QtCore.Qt.AlignCenter, elided_text)
painter.restore()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = TableView()
model = QtGui.QStandardItemModel(0, 3)
w.setModel(model)
w.resize(640, 480)
w.show()
def on_timeout():
if model.rowCount() > 0:
model.setRowCount(0)
else:
for j in range(4):
items = [
QtGui.QStandardItem(f"item ({j}-{i})")
for i in range(model.columnCount())
]
model.appendRow(items)
timer = QtCore.QTimer(interval=1000, timeout=on_timeout)
timer.start()
sys.exit(app.exec_())
我有一个非常简单的 QtableView,它是在程序运行后填充的。该程序需要几秒钟才能像这样填充 table..
我想知道如何在程序运行之前在 QTableView 上启用占位符文本“无数据”...
您必须覆盖 paintEvent 方法,在该方法中检查是否没有模型或模型是否没有行,然后绘制占位符文本:
from PySide2 import QtCore, QtGui, QtWidgets
class TableView(QtWidgets.QTableView):
def paintEvent(self, event):
super().paintEvent(event)
if self.model() is not None and self.model().rowCount() > 0:
return
painter = QtGui.QPainter(self.viewport())
painter.save()
col = self.palette().placeholderText().color()
painter.setPen(col)
fm = self.fontMetrics()
elided_text = fm.elidedText(
"No data", QtCore.Qt.ElideRight, self.viewport().width()
)
painter.drawText(self.viewport().rect(), QtCore.Qt.AlignCenter, elided_text)
painter.restore()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = TableView()
model = QtGui.QStandardItemModel(0, 3)
w.setModel(model)
w.resize(640, 480)
w.show()
def on_timeout():
if model.rowCount() > 0:
model.setRowCount(0)
else:
for j in range(4):
items = [
QtGui.QStandardItem(f"item ({j}-{i})")
for i in range(model.columnCount())
]
model.appendRow(items)
timer = QtCore.QTimer(interval=1000, timeout=on_timeout)
timer.start()
sys.exit(app.exec_())