为什么 QTableWidgetItem 不不断更新它的颜色?
Why QTableWidgetItem doesn't keep updating it's color?
我的程序中有一个 QTableWidget。我希望它的行和列根据 table 小部件中的时间条目更改颜色。当我第一次添加时间时,它与当前系统时间进行比较,颜色变化确实生效,但随着时间的推移它不会跟上,颜色保持不变。我希望它不断更新 table 项的颜色。我无法包含所有代码,因为它太长了,但我已经包含了相关部分。
#Operations_Tree is the QTABLEWIDGET
def Scheduler_Loop(self):
Timer = QtCore.QTimer(self)
Timer.start(1000)
Timer.timeout.connect(self.test)
def test(self):
time = QtCore.QTime.currentTime()
current_time_text = time.toString('hh:mm:ss')
for row in range(0,self.Operations_Tree.rowCount()):
time = self.Operations_Tree.item(row,1)
time_text = time.text()
#print(time_text)
if time_text >= current_time_text :
for column in range(0,6):
#print("TEST")
try:
table_widget_item = self.Operations_Tree.item(row, column)
table_widget_item.setForeground(QtGui.QColor(0,0,255)) #BLue
table_widget_item.setBackground(QtGui.QColor(238,233,233)) #
table_widget_item.viewport.update()
except AttributeError:
pass
else:
for column in range(0,6):
#print("TEST")
try:
table_widget_item = self.Operations_Tree.item(row, column)
#table_widget_item.setForeground(QtGui.QColor(0,255,0)) #
table_widget_item.setBackground(QtGui.QColor(238,233,233)) #
table_widget_item.viewport.update()
except AttributeError:
pass
self.Operations_Tree.update()
这是我的程序的快照:
对我来说,主要问题是你比较的是字符串而不是时间,在 Qt 中也没有必要使用 try-except,因为很多时候它们会隐藏错误并浪费不必要的资源,最好进行验证。
PyQt5:
from PyQt5 import QtCore, QtGui, QtWidgets
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
super(Widget, self).__init__(parent)
self.lcd_number = QtWidgets.QLCDNumber()
self.lcd_number.setFrameShape(QtWidgets.QFrame.NoFrame)
self.lcd_number.setFixedHeight(100)
self.lcd_number.setDigitCount(8)
self.Operations_Tree = QtWidgets.QTableWidget()
self.Operations_Tree.setColumnCount(6)
labels = ["On AIR", "TIME", "ITEM", "DURATION", "B.ITEM", "B.I.DURATION"]
self.Operations_Tree.setHorizontalHeaderLabels(labels)
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.lcd_number)
lay.addWidget(self.Operations_Tree)
for i, t in enumerate(("10:10:10", "12:12:12")):
self.Operations_Tree.insertRow(self.Operations_Tree.rowCount())
it = QtWidgets.QTableWidgetItem(t)
self.Operations_Tree.setItem(i, 1, it)
self.resize(640, 480)
self.Scheduler_Loop()
def Scheduler_Loop(self):
Timer = QtCore.QTimer(self)
Timer.timeout.connect(self.test)
Timer.start(1000)
self.test()
@QtCore.pyqtSlot()
def test(self):
time = QtCore.QTime.currentTime()
self.lcd_number.display(time.toString())
for row in range(self.Operations_Tree.rowCount()):
it = self.Operations_Tree.item(row, 1)
r_time = QtCore.QTime.fromString(it.text(), "h:mm:ss")
flag = r_time >= time
f_color = QtGui.QColor(0, 0, 255) if flag else QtGui.QColor(0, 255, 0)
b_color = QtGui.QColor(238, 233, 233) if flag else QtGui.QColor(238,233,233)
for column in range(0, 6):
it = self.Operations_Tree.item(row, column)
if it is None:
it = QtWidgets.QTableWidgetItem()
self.Operations_Tree.setItem(row, column, it)
it.setForeground(f_color)
it.setBackground(b_color)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
PyQt4:
from PyQt4 import QtCore, QtGui
class Widget(QtGui.QWidget):
def __init__(self, parent=None):
super(Widget, self).__init__(parent)
self.lcd_number = QtGui.QLCDNumber()
self.lcd_number.setFrameShape(QtGui.QFrame.NoFrame)
self.lcd_number.setFixedHeight(100)
self.lcd_number.setDigitCount(8)
self.Operations_Tree = QtGui.QTableWidget()
self.Operations_Tree.setColumnCount(6)
labels = ["On AIR", "TIME", "ITEM", "DURATION", "B.ITEM", "B.I.DURATION"]
self.Operations_Tree.setHorizontalHeaderLabels(labels)
lay = QtGui.QVBoxLayout(self)
lay.addWidget(self.lcd_number)
lay.addWidget(self.Operations_Tree)
for i, t in enumerate(("10:10:10", "12:12:12")):
self.Operations_Tree.insertRow(self.Operations_Tree.rowCount())
it = QtGui.QTableWidgetItem(t)
self.Operations_Tree.setItem(i, 1, it)
self.resize(640, 480)
self.Scheduler_Loop()
def Scheduler_Loop(self):
Timer = QtCore.QTimer(self)
Timer.timeout.connect(self.test)
Timer.start(1000)
self.test()
@QtCore.pyqtSlot()
def test(self):
time = QtCore.QTime.currentTime()
self.lcd_number.display(time.toString())
for row in range(self.Operations_Tree.rowCount()):
it = self.Operations_Tree.item(row, 1)
r_time = QtCore.QTime.fromString(it.text(), "h:mm:ss")
flag = r_time >= time
f_color = QtGui.QColor(0, 0, 255) if flag else QtGui.QColor(0, 255, 0)
b_color = QtGui.QColor(238, 233, 233) if flag else QtGui.QColor(238,233,233)
for column in range(0, 6):
it = self.Operations_Tree.item(row, column)
if it is None:
it = QtGui.QTableWidgetItem()
self.Operations_Tree.setItem(row, column, it)
it.setForeground(f_color)
it.setBackground(b_color)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
我的程序中有一个 QTableWidget。我希望它的行和列根据 table 小部件中的时间条目更改颜色。当我第一次添加时间时,它与当前系统时间进行比较,颜色变化确实生效,但随着时间的推移它不会跟上,颜色保持不变。我希望它不断更新 table 项的颜色。我无法包含所有代码,因为它太长了,但我已经包含了相关部分。
#Operations_Tree is the QTABLEWIDGET
def Scheduler_Loop(self):
Timer = QtCore.QTimer(self)
Timer.start(1000)
Timer.timeout.connect(self.test)
def test(self):
time = QtCore.QTime.currentTime()
current_time_text = time.toString('hh:mm:ss')
for row in range(0,self.Operations_Tree.rowCount()):
time = self.Operations_Tree.item(row,1)
time_text = time.text()
#print(time_text)
if time_text >= current_time_text :
for column in range(0,6):
#print("TEST")
try:
table_widget_item = self.Operations_Tree.item(row, column)
table_widget_item.setForeground(QtGui.QColor(0,0,255)) #BLue
table_widget_item.setBackground(QtGui.QColor(238,233,233)) #
table_widget_item.viewport.update()
except AttributeError:
pass
else:
for column in range(0,6):
#print("TEST")
try:
table_widget_item = self.Operations_Tree.item(row, column)
#table_widget_item.setForeground(QtGui.QColor(0,255,0)) #
table_widget_item.setBackground(QtGui.QColor(238,233,233)) #
table_widget_item.viewport.update()
except AttributeError:
pass
self.Operations_Tree.update()
这是我的程序的快照:
对我来说,主要问题是你比较的是字符串而不是时间,在 Qt 中也没有必要使用 try-except,因为很多时候它们会隐藏错误并浪费不必要的资源,最好进行验证。
PyQt5:
from PyQt5 import QtCore, QtGui, QtWidgets
class Widget(QtWidgets.QWidget):
def __init__(self, parent=None):
super(Widget, self).__init__(parent)
self.lcd_number = QtWidgets.QLCDNumber()
self.lcd_number.setFrameShape(QtWidgets.QFrame.NoFrame)
self.lcd_number.setFixedHeight(100)
self.lcd_number.setDigitCount(8)
self.Operations_Tree = QtWidgets.QTableWidget()
self.Operations_Tree.setColumnCount(6)
labels = ["On AIR", "TIME", "ITEM", "DURATION", "B.ITEM", "B.I.DURATION"]
self.Operations_Tree.setHorizontalHeaderLabels(labels)
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.lcd_number)
lay.addWidget(self.Operations_Tree)
for i, t in enumerate(("10:10:10", "12:12:12")):
self.Operations_Tree.insertRow(self.Operations_Tree.rowCount())
it = QtWidgets.QTableWidgetItem(t)
self.Operations_Tree.setItem(i, 1, it)
self.resize(640, 480)
self.Scheduler_Loop()
def Scheduler_Loop(self):
Timer = QtCore.QTimer(self)
Timer.timeout.connect(self.test)
Timer.start(1000)
self.test()
@QtCore.pyqtSlot()
def test(self):
time = QtCore.QTime.currentTime()
self.lcd_number.display(time.toString())
for row in range(self.Operations_Tree.rowCount()):
it = self.Operations_Tree.item(row, 1)
r_time = QtCore.QTime.fromString(it.text(), "h:mm:ss")
flag = r_time >= time
f_color = QtGui.QColor(0, 0, 255) if flag else QtGui.QColor(0, 255, 0)
b_color = QtGui.QColor(238, 233, 233) if flag else QtGui.QColor(238,233,233)
for column in range(0, 6):
it = self.Operations_Tree.item(row, column)
if it is None:
it = QtWidgets.QTableWidgetItem()
self.Operations_Tree.setItem(row, column, it)
it.setForeground(f_color)
it.setBackground(b_color)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
PyQt4:
from PyQt4 import QtCore, QtGui
class Widget(QtGui.QWidget):
def __init__(self, parent=None):
super(Widget, self).__init__(parent)
self.lcd_number = QtGui.QLCDNumber()
self.lcd_number.setFrameShape(QtGui.QFrame.NoFrame)
self.lcd_number.setFixedHeight(100)
self.lcd_number.setDigitCount(8)
self.Operations_Tree = QtGui.QTableWidget()
self.Operations_Tree.setColumnCount(6)
labels = ["On AIR", "TIME", "ITEM", "DURATION", "B.ITEM", "B.I.DURATION"]
self.Operations_Tree.setHorizontalHeaderLabels(labels)
lay = QtGui.QVBoxLayout(self)
lay.addWidget(self.lcd_number)
lay.addWidget(self.Operations_Tree)
for i, t in enumerate(("10:10:10", "12:12:12")):
self.Operations_Tree.insertRow(self.Operations_Tree.rowCount())
it = QtGui.QTableWidgetItem(t)
self.Operations_Tree.setItem(i, 1, it)
self.resize(640, 480)
self.Scheduler_Loop()
def Scheduler_Loop(self):
Timer = QtCore.QTimer(self)
Timer.timeout.connect(self.test)
Timer.start(1000)
self.test()
@QtCore.pyqtSlot()
def test(self):
time = QtCore.QTime.currentTime()
self.lcd_number.display(time.toString())
for row in range(self.Operations_Tree.rowCount()):
it = self.Operations_Tree.item(row, 1)
r_time = QtCore.QTime.fromString(it.text(), "h:mm:ss")
flag = r_time >= time
f_color = QtGui.QColor(0, 0, 255) if flag else QtGui.QColor(0, 255, 0)
b_color = QtGui.QColor(238, 233, 233) if flag else QtGui.QColor(238,233,233)
for column in range(0, 6):
it = self.Operations_Tree.item(row, column)
if it is None:
it = QtGui.QTableWidgetItem()
self.Operations_Tree.setItem(row, column, it)
it.setForeground(f_color)
it.setBackground(b_color)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())