embed matplotlib with custom Navigation toolbar actions in the Mainwindow toolbar

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I am trying not to use the navigation toolbar, instead I want to add these actions in the Mainwindow toolbar. Below is an example of the customization:

import sys
import matplotlib
matplotlib.use('Qt5Agg')
from PyQt5.QtWidgets import QToolBar, QMainWindow, QAction, qApp, QApplication
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtGui import QIcon
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg, NavigationToolbar2QT as NavigationToolbar
from matplotlib.figure import Figure

class MplCanvas(FigureCanvasQTAgg):

    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        super(MplCanvas, self).__init__(fig)


class MainWindow(QtWidgets.QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        zoomact = QAction(QIcon('zoom.png'), 'zoom', self)
        zoomact.setShortcut('Ctrl+z')
        zoomact.triggered.connect(self.zoom)

        self.toolbar = self.addToolBar('zoom')
        self.toolbar.addAction(zoomact)

        self.sc = MplCanvas(self, width=5, height=4, dpi=100)
        self.sc.axes.plot([0,1,2,3,4], [10,1,20,3,40])

        #
        toolbar = NavigationToolbar(self.sc, self)
        
        """Here I don't want to use the NavigationToolbar, but custom actions in the 
            toolbar. So I don't want to show the NavigationToolbar"""
            
        "Is there any custom function in the Figure canvas"    
            

        layout = QtWidgets.QVBoxLayout()
        layout.addWidget(toolbar)
        layout.addWidget(self.sc)

        # Create a placeholder widget to hold our toolbar and canvas.
        widget = QtWidgets.QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)

        self.show()

    "Customize function for a specific figure"
    def zoom(self):
        """here, I want to call the specific zoom function from NavigationToolbar
            to apply to this specific FigureCanvas using lambda function"""
        # My trial. I don't know, I cant figure it out :)
        lambda sc: NavigationToolbar2QT.toolitems["zoom"](self.sc, self)
            
    def home(self):
        pass    
    
    def Editaxis(self):
        pass
    
    def configuresubplots(self):
        pass
    
    def save(self):
        pass
    
    def leftbuttonpans(self):
        pass
    
    def backtopreviousview(self):
        pass
        
    def forwardtonextview(self):
        pass

app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
app.exec_()

So,

  • I want to hide the NavigationToolbar and not to use it
  • Then, to create custom actions in the Mainwindow toolbar that can act on the figure in the canvas, such as zoom, edit axis.....etc.
pyqt5 matplotlib python
1 Answers

You have to pass None as parent of the NavigationToolbar2QT:

import sys
import matplotlib

matplotlib.use("Qt5Agg")

from PyQt5.QtWidgets import QAction, QApplication, QMainWindow, QVBoxLayout, QWidget
from PyQt5.QtGui import QIcon

from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg, NavigationToolbar2QT
from matplotlib.figure import Figure


class MplCanvas(FigureCanvasQTAgg):
    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        super(MplCanvas, self).__init__(fig)


class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        print("Text: Name of method")
        for text, _, _, callback in NavigationToolbar2QT.toolitems:
            if isinstance(text, str):
                print(f"{text}: {callback}")

        self.sc = MplCanvas(self, width=5, height=4, dpi=100)
        self.mpl_toolbar = NavigationToolbar2QT(self.sc, None)

        zoomact = QAction(QIcon("zoom.png"), "zoom", self)
        zoomact.setShortcut("Ctrl+z")
        zoomact.triggered.connect(self.mpl_toolbar.zoom)

        self.toolbar = self.addToolBar("zoom")
        self.toolbar.addAction(zoomact)

        self.sc.axes.plot([0, 1, 2, 3, 4], [10, 1, 20, 3, 40])

        widget = QWidget()
        self.setCentralWidget(widget)
        layout = QVBoxLayout(widget)
        layout.addWidget(self.sc)


def main():
    app = QApplication(sys.argv)
    w = MainWindow()
    w.show()
    app.exec_()


if __name__ == "__main__":
    main()

Another option is to remove the QActions from the NavigationToolbar2QT:

import sys
import matplotlib

matplotlib.use("Qt5Agg")

from PyQt5.QtWidgets import QAction, QApplication, QMainWindow, QVBoxLayout, QWidget
from PyQt5.QtGui import QIcon

from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg, NavigationToolbar2QT
from matplotlib.figure import Figure


class MplCanvas(FigureCanvasQTAgg):
    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        super(MplCanvas, self).__init__(fig)


class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        print("Text: Name of method")
        for text, _, _, callback in NavigationToolbar2QT.toolitems:
            if isinstance(text, str):
                print(f"{text}: {callback}")

        self.sc = MplCanvas(self, width=5, height=4, dpi=100)
        self.toolbar = NavigationToolbar2QT(self.sc, self)
        self.addToolBar(self.toolbar)
        self.toolbar.clear()

        zoomact = QAction(QIcon("zoom.png"), "zoom", self)
        zoomact.setShortcut("Ctrl+z")
        zoomact.triggered.connect(self.toolbar.zoom)

        self.toolbar.addAction(zoomact)

        self.sc.axes.plot([0, 1, 2, 3, 4], [10, 1, 20, 3, 40])

        widget = QWidget()
        self.setCentralWidget(widget)
        layout = QVBoxLayout(widget)
        layout.addWidget(self.sc)


def main():
    app = QApplication(sys.argv)
    w = MainWindow()
    w.show()
    app.exec_()


if __name__ == "__main__":
    main()
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