pyqt - 根据用户输入自动更新小部件
pyqt - Automatically update widget on user input
这里是pyqt的新手。当用户 select 在组合框 2 中的某些选项时，尝试自动修改小部件以显示不同的选项。IE 如果用户 selects 'Cliff Erosion' 或 'Dune Erosion'，我希望小部件使用其他组合框刷新。同样，如果他们 select 回到 'Rising Tides' 或 'Coastal Flooding' 我希望小部件回到原来的通话。如何刷新小部件？
from PyQt4.QtGui import *
# Create window
class Window(QWidget):
#This block adds features into the window init
def __init__(self):
QWidget.__init__(self)
self.setWindowTitle('Monterey Bay Sea Level Rise')
self.resize(300, 240)
self.addWidgets1()
def addWidgets1(self):
#Add drop-down list for selecting forecast year
self.year_lbl = QLabel("1. Select Forecast Year", self)
self.year_lbl.move(5,0)
year = QComboBox(self)
year.addItem('2030')
year.addItem('2060')
year.addItem('2100')
year.move(5,20)
#Add drop-down list for selecting hazard
self.hazard_lbl = QLabel("2. Select Coastal Hazard", self)
self.hazard_lbl.move(5,50)
hazard = QComboBox(self)
hazard.addItem('Rising Tides')
hazard.addItem('Coastal Storm Flooding')
hazard.addItem('Cliff Erosion')
hazard.addItem('Dune Erosion')
hazard.activated[str].connect(self.addWidget2)
hazard.move(5,70)
#Add drop-down list for inputing model intensity (s1,s2,s3)
self.intensity_lbl = QLabel("3. Select Intensity", self)
self.intensity_lbl.move(5,100)
intensity = QComboBox(self)
intensity.addItem('Low')
intensity.addItem('Mid')
intensity.addItem('High')
intensity.move(5,120)
def addWidget2(self,text):
#if hazard is cliff erosion or dune erosion we want to update the widget
#... to include wstorm,long_term AND no_change,stormier
if text == 'Cliff Erosion' or text == 'Dune Erosion':
print 'Hi'
self.type_lbl = QLabel("3. Select type of changes", self)
self.type_lbl.move(5,150)
types = QComboBox(self)
types.addItem('Long-term')
types.addItem('Storm induced')
types.move(5,180)
self.storm_lbl = QLabel("4. Select for stormier", self)
self.storm_lbl.move(5,150)
storm = QComboBox(self)
storm.addItem('No Change')
storm.addItem('Stormier')
storm.move(5,180)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
window = Window()
#window.resize(100, 60)
window.show()
sys.exit(app.exec_())
向 Qt 应用程序添加小部件的常规方法是使用 layouts。他们将计算您的小部件的首选大小和位置，并在需要时更新它，例如添加小部件或调整 window 大小时（请注意在执行期间将 window 变小并与我下面的解决方案进行比较时会发生什么）。我确信可以自己完成所有移动和调整大小，但 QLayouts 确实是可行的方法，我强烈建议您也使用它们。
QLayout 有几种类型，但在您的情况下我会使用 QFormLayout。令我惊讶的是，QFormLayout 确实有一个 addRow 方法，但没有对应的 removeRow。但是，我发现仅 showing/hiding 组合框在需要时也能达到目的。我在下面改编了你的例子。
最后，即使只显示或隐藏最后两个组合框也会导致布局稍微移动前三个。这是因为第 4 个标签是所有标签中最长的。我觉得这很烦人。也许更好的解决方案是在需要时 enable/disable 组合框。这样做的额外好处是向用户表明这些选项甚至存在。另请参见下面的代码。第二种选择可能是使用 QGridLayout（而不是 QFormLayout）并使用 setColumnMinimumWidth 将第一列设置为可以容纳所有可能标签的大小。
from PyQt4 import QtGui
# Create window
class Window(QtGui.QWidget):
#This block adds features into the window init
def __init__(self):
QtGui.QWidget.__init__(self)
self.setWindowTitle('Monterey Bay Sea Level Rise')
self.resize(300, 240)
self.addWidgets1()
def addWidgets1(self):
self.layout = QtGui.QFormLayout()
self.setLayout(self.layout)
#Add drop-down list for selecting forecast year
# You don't need to set to parent of the widgets to self anymore, the
# layout will set the parent automatically when you add the widgets
self.year_lbl = QtGui.QLabel("1. Select Forecast Year")
# self.year_lbl.move(5,0) # Can be removed. The layout takes care of it.
year = QtGui.QComboBox()
year.addItem('2030')
year.addItem('2060')
year.addItem('2100')
self.layout.addRow(self.year_lbl, year)
#Add drop-down list for selecting hazard
self.hazard_lbl = QtGui.QLabel("2. Select Coastal Hazard")
self.hazard = QtGui.QComboBox()
self.hazard.addItem('Rising Tides')
self.hazard.addItem('Coastal Storm Flooding')
self.hazard.addItem('Cliff Erosion')
self.hazard.addItem('Dune Erosion')
self.hazard.activated[str].connect(self.updateComboboxes)
self.layout.addRow(self.hazard_lbl, self.hazard)
#Add drop-down list for inputing model intensity (s1,s2,s3)
self.intensity_lbl = QtGui.QLabel("3. Select Intensity")
intensity = QtGui.QComboBox()
intensity.addItem('Low')
intensity.addItem('Mid')
intensity.addItem('High')
self.layout.addRow(self.intensity_lbl, intensity)
self.types_lbl = QtGui.QLabel("3. Select type of changes")
self.types = QtGui.QComboBox()
self.types.addItem('Long-term')
self.types.addItem('Storm induced')
self.layout.addRow(self.types_lbl, self.types)
self.storm_lbl = QtGui.QLabel("4. Select for stormier")
self.storm = QtGui.QComboBox()
self.storm.addItem('No Change')
self.storm.addItem('Stormier')
self.layout.addRow(self.storm_lbl, self.storm)
# show initial state
self.updateComboboxes()
def updateComboboxes(self, text=None):
#if hazard is cliff erosion or dune erosion we want to update the widget
#... to include wstorm,long_term AND no_change,stormier
if text is None:
text = self.hazard.currentText()
usable = (text == 'Cliff Erosion' or text == 'Dune Erosion')
if True: # change to False to use enabling/disabling widgets
# May cause other widgets to be relocated
self.types_lbl.setVisible(usable)
self.types.setVisible(usable)
self.storm_lbl.setVisible(usable)
self.storm.setVisible(usable)
else:
# This option doesn't relocate widgets
# Also may give additional clue to the uses that this exsits
self.types_lbl.setEnabled(usable)
self.types.setEnabled(usable)
self.storm_lbl.setEnabled(usable)
self.storm.setEnabled(usable)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = Window()
#window.resize(100, 60)
window.show()
sys.exit(app.exec_())
这里是pyqt的新手。当用户 select 在组合框 2 中的某些选项时，尝试自动修改小部件以显示不同的选项。IE 如果用户 selects 'Cliff Erosion' 或 'Dune Erosion'，我希望小部件使用其他组合框刷新。同样，如果他们 select 回到 'Rising Tides' 或 'Coastal Flooding' 我希望小部件回到原来的通话。如何刷新小部件？
from PyQt4.QtGui import *
# Create window
class Window(QWidget):
#This block adds features into the window init
def __init__(self):
QWidget.__init__(self)
self.setWindowTitle('Monterey Bay Sea Level Rise')
self.resize(300, 240)
self.addWidgets1()
def addWidgets1(self):
#Add drop-down list for selecting forecast year
self.year_lbl = QLabel("1. Select Forecast Year", self)
self.year_lbl.move(5,0)
year = QComboBox(self)
year.addItem('2030')
year.addItem('2060')
year.addItem('2100')
year.move(5,20)
#Add drop-down list for selecting hazard
self.hazard_lbl = QLabel("2. Select Coastal Hazard", self)
self.hazard_lbl.move(5,50)
hazard = QComboBox(self)
hazard.addItem('Rising Tides')
hazard.addItem('Coastal Storm Flooding')
hazard.addItem('Cliff Erosion')
hazard.addItem('Dune Erosion')
hazard.activated[str].connect(self.addWidget2)
hazard.move(5,70)
#Add drop-down list for inputing model intensity (s1,s2,s3)
self.intensity_lbl = QLabel("3. Select Intensity", self)
self.intensity_lbl.move(5,100)
intensity = QComboBox(self)
intensity.addItem('Low')
intensity.addItem('Mid')
intensity.addItem('High')
intensity.move(5,120)
def addWidget2(self,text):
#if hazard is cliff erosion or dune erosion we want to update the widget
#... to include wstorm,long_term AND no_change,stormier
if text == 'Cliff Erosion' or text == 'Dune Erosion':
print 'Hi'
self.type_lbl = QLabel("3. Select type of changes", self)
self.type_lbl.move(5,150)
types = QComboBox(self)
types.addItem('Long-term')
types.addItem('Storm induced')
types.move(5,180)
self.storm_lbl = QLabel("4. Select for stormier", self)
self.storm_lbl.move(5,150)
storm = QComboBox(self)
storm.addItem('No Change')
storm.addItem('Stormier')
storm.move(5,180)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
window = Window()
#window.resize(100, 60)
window.show()
sys.exit(app.exec_())
向 Qt 应用程序添加小部件的常规方法是使用 layouts。他们将计算您的小部件的首选大小和位置，并在需要时更新它，例如添加小部件或调整 window 大小时（请注意在执行期间将 window 变小并与我下面的解决方案进行比较时会发生什么）。我确信可以自己完成所有移动和调整大小，但 QLayouts 确实是可行的方法，我强烈建议您也使用它们。
QLayout 有几种类型，但在您的情况下我会使用 QFormLayout。令我惊讶的是，QFormLayout 确实有一个 addRow 方法，但没有对应的 removeRow。但是，我发现仅 showing/hiding 组合框在需要时也能达到目的。我在下面改编了你的例子。
最后，即使只显示或隐藏最后两个组合框也会导致布局稍微移动前三个。这是因为第 4 个标签是所有标签中最长的。我觉得这很烦人。也许更好的解决方案是在需要时 enable/disable 组合框。这样做的额外好处是向用户表明这些选项甚至存在。另请参见下面的代码。第二种选择可能是使用 QGridLayout（而不是 QFormLayout）并使用 setColumnMinimumWidth 将第一列设置为可以容纳所有可能标签的大小。
from PyQt4 import QtGui
# Create window
class Window(QtGui.QWidget):
#This block adds features into the window init
def __init__(self):
QtGui.QWidget.__init__(self)
self.setWindowTitle('Monterey Bay Sea Level Rise')
self.resize(300, 240)
self.addWidgets1()
def addWidgets1(self):
self.layout = QtGui.QFormLayout()
self.setLayout(self.layout)
#Add drop-down list for selecting forecast year
# You don't need to set to parent of the widgets to self anymore, the
# layout will set the parent automatically when you add the widgets
self.year_lbl = QtGui.QLabel("1. Select Forecast Year")
# self.year_lbl.move(5,0) # Can be removed. The layout takes care of it.
year = QtGui.QComboBox()
year.addItem('2030')
year.addItem('2060')
year.addItem('2100')
self.layout.addRow(self.year_lbl, year)
#Add drop-down list for selecting hazard
self.hazard_lbl = QtGui.QLabel("2. Select Coastal Hazard")
self.hazard = QtGui.QComboBox()
self.hazard.addItem('Rising Tides')
self.hazard.addItem('Coastal Storm Flooding')
self.hazard.addItem('Cliff Erosion')
self.hazard.addItem('Dune Erosion')
self.hazard.activated[str].connect(self.updateComboboxes)
self.layout.addRow(self.hazard_lbl, self.hazard)
#Add drop-down list for inputing model intensity (s1,s2,s3)
self.intensity_lbl = QtGui.QLabel("3. Select Intensity")
intensity = QtGui.QComboBox()
intensity.addItem('Low')
intensity.addItem('Mid')
intensity.addItem('High')
self.layout.addRow(self.intensity_lbl, intensity)
self.types_lbl = QtGui.QLabel("3. Select type of changes")
self.types = QtGui.QComboBox()
self.types.addItem('Long-term')
self.types.addItem('Storm induced')
self.layout.addRow(self.types_lbl, self.types)
self.storm_lbl = QtGui.QLabel("4. Select for stormier")
self.storm = QtGui.QComboBox()
self.storm.addItem('No Change')
self.storm.addItem('Stormier')
self.layout.addRow(self.storm_lbl, self.storm)
# show initial state
self.updateComboboxes()
def updateComboboxes(self, text=None):
#if hazard is cliff erosion or dune erosion we want to update the widget
#... to include wstorm,long_term AND no_change,stormier
if text is None:
text = self.hazard.currentText()
usable = (text == 'Cliff Erosion' or text == 'Dune Erosion')
if True: # change to False to use enabling/disabling widgets
# May cause other widgets to be relocated
self.types_lbl.setVisible(usable)
self.types.setVisible(usable)
self.storm_lbl.setVisible(usable)
self.storm.setVisible(usable)
else:
# This option doesn't relocate widgets
# Also may give additional clue to the uses that this exsits
self.types_lbl.setEnabled(usable)
self.types.setEnabled(usable)
self.storm_lbl.setEnabled(usable)
self.storm.setEnabled(usable)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = Window()
#window.resize(100, 60)
window.show()
sys.exit(app.exec_())