How to connect using menubar in pyqt5? - pyqt5

I want to open a picture when I click the menu, but I don't know how
I want to be able to output the specified image file when clicking the submenu.
import sys
from PyQt5.QtWidgets import QMainWindow, QMenu, QApplication, QLabel
from PyQt5.QtGui import QPixmap, QIcon,QAction,*
class Example(QMainWindow):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
menubar= self.menubar()
self.filemenu = menubar.addmenu('a')
x= QMenu('b',self)
y= QMenu('c',self)
self.filemenu.addmenu(y)
self.x1 =QAction('d',self)
x.addMenu(self.x1)
self.x1.triggered.connect(self.fileopen)
def fileopen(self):
qpixmapvar=QPixmap()
qpixmapvar.load("C:\\desktop\\A.png")
self.label.setPixmap(qPixmapvar)
self.label.resize(qPixmapvar.width(), qPixmapvar.height())
if__name__ =='__main__':
app= Qapplication(sys.argv)
ex = Example()
sys.exit(app.exec())

Related

unable to update matplotlib figure in pyqt5

I am studying MDIwindow in pyqt5
I want to update the ForcemapWidget figure when I click on the HeatmapWidget figure. However, the diagram did not update.
It is confirmed that the canvas in the ForcemapWidget is updated by the print function. We know that the coordinates are also obtained. But for some reason, the chart doesn't update.
import numpy as np
import matplotlib.pyplot as plt
from PyQt5.QtWidgets import QVBoxLayout,QApplication,QWidget,QMainWindow,QMdiArea,QAction,QMdiSubWindow,QTextEdit, \
QComboBox,QLineEdit,QPushButton,QCheckBox,QFormLayout
import sys
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
class MDIWindow(QMainWindow):
count=0
def __init__(self):
super ().__init__()
self.mdi=QMdiArea()
self.setCentralWidget(self.mdi)
bar=self.menuBar()
file=bar.addMenu("File")
file.addAction("New")
file.addAction("Cascade")
file.addAction("Tiled")
file.triggered[QAction].connect(self.tritri)
self.setWindowTitle("MDI Application")
# 最初のサブウィンドウを作成
sub=QMdiSubWindow()
form_widget=FormWidget()
sub.setWidget(form_widget)
sub.setWindowTitle("Sub Window 1")
self.mdi.addSubWindow(sub)
sub.show()
sub2=QMdiSubWindow()
# ForcemapWidget.force_update()
form_widget=ForcemapWidget()
# form_widget.update()
# print(form_widget)
sub2.setWidget (form_widget)
sub2.setWindowTitle("Sub Window 2")
self.mdi.addSubWindow(sub2)
sub2.show()
def tritri(self,p):
if p.text()=="New":
MDIWindow.count=MDIWindow.count+1
sub=QMdiSubWindow()
heatmap_widget=HeatmapWidget()
sub.setWidget(heatmap_widget)
sub.setWindowTitle("Sub Window"+str(MDIWindow.count))
self.mdi.addSubWindow(sub)
sub.show()
if p.text()=="Cascade":
self.mdi.cascadeSubWindows()
if p.text()=="Tiled":
self.mdi.tileSubWindows ()
class HeatmapWidget(QWidget):
def __init__(self):
super().__init__()
self.forcemapWidget=ForcemapWidget
fig,ax=plt.subplots (figsize = (1,1))
heatmap=np.random.rand (256,256)
im=ax.imshow(heatmap,cmap = "hot")
fig.colorbar(im)
ax.set_title("Heatmap")
fig.canvas.mpl_connect("button_press_event",self.onclick)
canvas=FigureCanvas(fig)
layout=QVBoxLayout()
layout.addWidget(canvas)
self.setLayout (layout)
def onclick(self,event):
x,y=event.xdata,event.ydata
forcemap=ForcemapWidget(x)
class ForcemapWidget (QWidget):
def __init__(self,x=None):
super().__init__()
self.figure=plt.figure()
self.initUI(x)
def initUI(self,x):
self.figure.clear()
ax=self.figure.add_subplot(111)
if x is not None:
heatmap=np.random.rand(int (x),256)
else:
heatmap=np.random.rand(256,256)
im=ax.imshow(heatmap,cmap = "hot")
# self.figure.colorbar (im)
canvas=FigureCanvas(self.figure)
layout=QVBoxLayout()
layout.addWidget(canvas)
self.setLayout(layout)
self.update()
class FormWidget(QWidget):
def __init__(self):
super().__init__()
form_layout = QFormLayout()
combo = QComboBox()
combo.addItems(["Option 1", "Option 2", "Option 3"])
form_layout.addRow("Dropdown:", combo)
line_edit = QLineEdit()
form_layout.addRow("Input:", line_edit)
button = QPushButton("Submit")
form_layout.addRow(button)
check_box = QCheckBox()
form_layout.addRow("Checkbox:", check_box)
self.setLayout(form_layout)
app = QApplication(sys.argv)
mdi = MDIWindow()
mdi.show()
app.exec_()

Indicating that a QOpenGLWidget widget is to have a translucent background does not appear to work

There is no effect when I set the WA_TranslucentBackground attribute on a widget (derived from QOpenGLWidget). I have to set the attribute on the main window instead, which doesn't seem right: the documentation clearly states that the attribute applies to the widget itself:
Indicates that the widget should have a translucent background, i.e.,
any non-opaque regions of the widgets will be translucent because the
widget will have an alpha channel
What is the correct way to make the widget itself have a translucent background? Here is the code:
import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QOpenGLWidget
from PyQt5.QtCore import Qt, QPointF, QLineF
from PyQt5.QtGui import QColor, QPen, QPainter, QPaintEvent
class LineWidget(QOpenGLWidget):
def __init__(self, parent, start : QPointF, end : QPointF, colour : str = 'black'):
super(LineWidget, self).__init__(parent)
self.colour = colour
self.line = QLineF(start, end)
# self.setAttribute(Qt.WA_TranslucentBackground)
def paintEvent(self, a0: QPaintEvent) -> None:
painter = QPainter(self)
painter.begin(self)
painter.setPen(QPen(QColor(self.colour), 5))
painter.drawLine(self.line)
painter.end()
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.lineWidget = LineWidget(self, QPointF(0, 0), QPointF(400, 400), 'red')
self.setCentralWidget(self.lineWidget)
self.setWindowFlags(Qt.FramelessWindowHint)
self.setAttribute(Qt.WA_TranslucentBackground)
self.show()
if __name__ == "__main__":
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec())

pyqt5 - Problem switching back from QDialog window to QMainWindow

Hope indention is OK. I removed the reference to the current instance but the issue is still there. Closing the QDialog window with 'x' the MainWindow is displayed for a second and then it close out, while pressing the 'Cancel' button in the QDialog window it works fine.
Thanks for any suggestion
'''
import sys
from PyQt5 import QtWidgets, QtCore
from PyQt5.QtCore import QSize, Qt
from PyQt5.QtWidgets import QApplication,QWidget, QMainWindow, QDialog
from MainW import Ui_f_main
from ShowDialogUi import Ui_f_Dialog
class MainWindow(QWidget, Ui_f_main):
def __init__(self):
super().__init__()
self.setupUi(self)
self.wDiag = None
self.pbDialog.clicked.connect(self.dialog)
def dialog(self):
if self.wDiag is None:
window.close()
self.wDiag=ShowDialog()
self.wDiag.setAttribute(Qt.WA_DeleteOnClose)
self.wDiag.destroyed.connect(self.resetFlag_wDiag)
self.wDiag.show()
self.wDiag.pbOK.clicked.connect(self.go_on)
self.wDiag.pbCancel.clicked.connect(self.go_back)
else:
self.wDiag.close()
self.wDiag=None
def go_on(self):
print("OK")
def go_back(self):
window.show()
self.wDiag.close()
self.wDiag=None
def resetFlag_wDiag(self):
window.show()
self.wDiag=None
class ShowDialog(QDialog,Ui_f_Dialog):
def __init__(self):
super().__init__()
self.setupUi(self)
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
'''

PyQt5 window opens then closes in a second

from PyQt5.QtWidgets import QApplication, QPushButton, QMainWindow
from PyQt5.QtGui import QIcon
import sys
class Main(QMainWindow):
def __init__(self, parent=None) -> None:
super().__init__(parent=parent)
self.setWindowTitle("QPushButton")
left = 300
top = 200
width = 300
height = 250
self.setGeometry(left, top, width, height)
self.show()
def main():
App = QApplication(sys.argv)
Main()
sys.exit(App.exec())
if __name__=="__main__":
main()
I don't get it, it worked before now it closes within a second of opening. I'm thinking somehow my installation got corrupted. Do you have any ideas I tried
def main():
App = QApplication(sys.argv)
Main()
App.exec_()

pyqt5 videowidget not showing in layout

I am writing a program with pyqt5 where pressing a button first cycles through some pictures then cycles through some videos.
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtMultimedia import *
from PyQt5.QtMultimediaWidgets import *
import glob
import argparse
import sys
class MainWindow(QMainWindow):
def __init__(self,args):
super(MainWindow, self).__init__()
self.setWindowTitle('Navon test')
self.setWindowFlags(Qt.FramelessWindowHint)
# exit option for the menu bar File menu
self.exit = QAction('Exit', self)
self.exit.setShortcut('Ctrl+q')
# message for the status bar if mouse is over Exit
self.exit.setStatusTip('Exit program')
# newer connect style (PySide/PyQT 4.5 and higher)
self.exit.triggered.connect(app.quit)
self.setWindowIcon(QIcon('icon.ico'))
self.centralwidget = CentralWidget(args)
self.setCentralWidget(self.centralwidget)
def keyPressEvent(self, QKeyEvent):
if QKeyEvent.key() == Qt.Key_Escape:
QCoreApplication.instance().quit()
self.centralwidget.startvid()
class CentralWidget(QWidget):
def __init__(self,args):
super(CentralWidget, self).__init__()
self.layout = QVBoxLayout()
self.layout.setAlignment(Qt.AlignCenter)
self.setLayout(self.layout)
self.player = QMediaPlayer(None, QMediaPlayer.VideoSurface)
self.vw = QVideoWidget()
self.player.setVideoOutput(self.vw)
def startvid(self):
self.layout.addWidget(self.vw)
url= QUrl.fromLocalFile(glob.glob("videos/*")[0])
content= QMediaContent(url)
self.player.setMedia(content)
self.player.setVideoOutput(self.vw)
self.player.play()
if __name__== "__main__":
parser = argparse.ArgumentParser()
#~ parser.add_argument("-nb","--nobox",action="store_true", help="do not wait for the box connection")
args = parser.parse_args()
app = QApplication(sys.argv)
mainwindow = MainWindow(args)
#~ mainwindow.showFullScreen()
mainwindow.show()
sys.exit(app.exec_())
I tried to paste the minimal code. The thing is, I press the button nothing shows, although I used examples like this one PyQt5 - Can't play video using QVideoWidget to test if playing the video is ok, and these work. It's as if it is not adding the widget to the layout or something. Any idea what might be wrong?
I had to use QGraphicsView to achieve what I wanted, here is a fix:
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtMultimedia import *
from PyQt5.QtMultimediaWidgets import *
import glob
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.setWindowTitle('Navon test')
self.setWindowFlags(Qt.FramelessWindowHint)
# exit option for the menu bar File menu
self.exit = QAction('Exit', self)
self.exit.setShortcut('Ctrl+q')
# message for the status bar if mouse is over Exit
self.exit.setStatusTip('Exit program')
# newer connect style (PySide/PyQT 4.5 and higher)
self.exit.triggered.connect(app.quit)
self.setWindowIcon(QIcon('icon.ico'))
self.centralwidget = VideoPlayer()
self.setCentralWidget(self.centralwidget)
def keyPressEvent(self, QKeyEvent):
if QKeyEvent.key() == Qt.Key_Escape:
self.centralwidget.phaseQuit(2)
self.centralwidget.play()
class VideoPlayer(QWidget):
def __init__(self, parent=None):
super(VideoPlayer, self).__init__(parent)
self.mediaPlayer = QMediaPlayer(None, QMediaPlayer.VideoSurface)
self.videoItem = QGraphicsVideoItem()
self.videoItem.setSize(QSizeF(640, 480))
scene = QGraphicsScene(self)
graphicsView = QGraphicsView(scene)
scene.addItem(self.videoItem)
layout = QVBoxLayout()
layout.addWidget(graphicsView)
self.setLayout(layout)
self.mediaPlayer.setVideoOutput(self.videoItem)
self.counter = 0
def play(self):
if self.mediaPlayer.state() == QMediaPlayer.PlayingState:
pass
else:
self.mediaPlayer.setMedia(QMediaContent(QUrl.fromLocalFile(glob.glob("videos/*")[self.counter])))
self.mediaPlayer.play()
self.counter += 1
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
player = MainWindow()
player.show()
sys.exit(app.exec_())