如何在不同的标签中传递滑块的值？

Question

我目前正在使用PyQt4进行GUI。我的问题如下：如何在不同的QtGui.QSlider中传递QtGui.QTabWidget的价值？这是一个包含3个选项卡的最小工作示例：

import numpy as np
from PyQt4 import QtCore, QtGui
import matplotlib.pyplot as plt
#
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
#%%
# some Arbitrary data
nbr_points = 500
my_X_data = np.linspace(-10,10,nbr_points)
#
my_Y_data_tab1 = my_X_data**3 + 100*np.cos(my_X_data*5)
my_Y_data_tab2 = np.tan(my_X_data)
my_Y_data_tab3 = -10*my_X_data *np.sin(my_X_data)

class MyWidget(QtGui.QMainWindow):
    def __init__(self):
        super(MyWidget, self).__init__()
        self.initUI()

    def initUI(self):
        self.setGeometry(600,300,1000,600) 
        tabs = QtGui.QTabWidget() 
        # creation of 3 tabs
        self.tab_plot1 = QtGui.QWidget()
        self.tab_plot2 = QtGui.QWidget()
        self.tab_plot3 = QtGui.QWidget()
        # 
        self.setCentralWidget(tabs) 
        #
        self.tab_plot_1()
        self.tab_plot_2()
        self.tab_plot_3()
        tabs.addTab(self.tab_plot1, 'tab1')
        tabs.addTab(self.tab_plot2, 'tab2')
        tabs.addTab(self.tab_plot3, 'tab3')
        self.show()

    def tab_plot_1(self):
        self.figure_1 = plt.figure(figsize=(15,5))
        self.canvas_1 = FigureCanvas(self.figure_1)
        # Slider
        self.slider_1 = QtGui.QSlider(minimum=0, 
            maximum= nbr_points-1, 
            orientation=QtCore.Qt.Horizontal,
            tickInterval=1)
        self.slider_1.valueChanged.connect(self.on_valueChanged_1)
        ax = self.figure_1.add_subplot(111)
        ax.clear()
        ax.plot(my_X_data,my_Y_data_tab1,'b-')        
        ax.set_xlim([-10,10])  
        ax.set_ylim([-1000,1000])  
        X_point, Y_point = [],[]
        self.scat_1 = ax.scatter(X_point, Y_point, s=100,c='k')
        layout = QtGui.QFormLayout()
        layout.addRow(self.canvas_1)
        layout.addRow(self.slider_1)
        self.tab_plot1.setLayout(layout)       

    def tab_plot_2(self):
        self.figure_2 = plt.figure(figsize=(15,5))
        self.canvas_2 = FigureCanvas(self.figure_2)
        # Slider
        self.slider_2 = QtGui.QSlider(minimum=0, 
            maximum= nbr_points-1, 
            orientation=QtCore.Qt.Horizontal,
            tickInterval=1)
        self.slider_2.valueChanged.connect(self.on_valueChanged_2)
        ax = self.figure_2.add_subplot(111)
        ax.clear()
        ax.plot(my_X_data,my_Y_data_tab2,'r-')        
        ax.set_xlim([-10,10])  
        ax.set_ylim([-1000,1000])  
        X_point, Y_point = [],[]
        self.scat_2 = ax.scatter(X_point, Y_point, s=100,c='k')
        layout = QtGui.QFormLayout()
        layout.addRow(self.canvas_2)
        layout.addRow(self.slider_2)
        self.tab_plot2.setLayout(layout)

    def tab_plot_3(self):
        self.figure_3 = plt.figure(figsize=(15,5))
        self.canvas_3 = FigureCanvas(self.figure_3)
        # Slider
        self.slider_3 = QtGui.QSlider(minimum=0, 
            maximum= nbr_points-1, 
            orientation=QtCore.Qt.Horizontal,
            tickInterval=1)
        self.slider_3.valueChanged.connect(self.on_valueChanged_3)
        ax = self.figure_3.add_subplot(111)
        ax.clear()
        ax.plot(my_X_data,my_Y_data_tab3,'g-')        
        ax.set_xlim([-10,10])  
        ax.set_ylim([-1000,1000])  
        X_point, Y_point = [],[]
        self.scat_3 = ax.scatter(X_point, Y_point, s=100,c='k')
        layout = QtGui.QFormLayout()
        layout.addRow(self.canvas_3)
        layout.addRow(self.slider_3)
        self.tab_plot3.setLayout(layout)      

    @QtCore.pyqtSlot(int)
    def on_valueChanged_1(self, value):
        X_point = my_X_data[value,]
        Y_point = my_Y_data_tab1[value,]
        self.scat_1.set_offsets(np.c_[X_point,Y_point])   
        self.canvas_1.draw()

    @QtCore.pyqtSlot(int)
    def on_valueChanged_2(self, value):
        X_point = my_X_data[value,]
        Y_point = my_Y_data_tab2[value,]
        self.scat_2.set_offsets(np.c_[X_point,Y_point])   
        self.canvas_2.draw()

    @QtCore.pyqtSlot(int)
    def on_valueChanged_3(self, value):
        X_point = my_X_data[value,]
        Y_point = my_Y_data_tab3[value,]
        self.scat_3.set_offsets(np.c_[X_point,Y_point])   
        self.canvas_3.draw()

def main():
    import sys
    app = QtGui.QApplication(sys.argv)
    w = MyWidget()
    w.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

在这种情况下，当本地修改时，滑块的值应该在不同的选项卡上向下传递，以便在浏览选项卡时强制使用相同的本地值。

最后的试验不成功......任何帮助将不胜感激。

Answer 1

如果我清楚地理解，如果滑块上的值发生了变化（例如slider_1），请将该值设置为其他两个滑块（slider_2和slider_3）

EG

self.slider_1.valueChanged.connect(self.on_valueChanged_1)

当更改slider_1上的值时，您调用self.on_valueChanged_1，在该函数中您可以执行以下操作：

def on_valueChanged_1(self, value):
    X_point = my_X_data[value,]
    Y_point = my_Y_data_tab1[value,]
    self.scat_1.set_offsets(np.c_[X_point,Y_point])   
    self.canvas_1.draw()

    # Get current value 
    curr_value = self.slider_1.value()
    # Set the value of the slider on which the value has been changed to the other two sliders
    self.slider_2.setValue(curr_value)
    self.slider_3.setValue(curr_value)

并在函数on_valueChanged_2和on_valueChanged_3中为其他两个滑块重复它