Error using QLabel class method - PyQt5

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Error using QLabel class method - PyQt5

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#1 by (2 votes)

-2

I'm trying to create an application that does the following: every time the user clicks on an image that will be inside a QLabel, it will open a dialog for the user to open another image.

It happens that you give the following error the setPixmap method in the HandlerWindow class constructor:

self.label.setPixmap(QPixmap("imagem.jpg").scaled(250,150, Qt.KeepAspectRatio))
NameError: name 'QPixmap' is not defined

Complete code:

from PyQt5.QtWidgets import (QApplication, QWidget, QPushButton, QLineEdit,
                            QHBoxLayout, QMessageBox, QRadioButton, QGroupBox,
                            QVBoxLayout,QLabel)

class CustomLabel(QLabel):
    def __init__(self, parent=None):
        super(CustomLabel, self).__init__(parent)
        self.setMouseTracking(True)

    def mousePressEvent(self, e):
        img, re = QFileDialog.getOpenFileName(self, "Selecionar Arquivo", filter="All(*.png *.jpg)")
        if re:
            self.setPixmap(QPixmap(img).scaled(250, 150, Qt.KeepAspectRatio))

class HandlerWindow(QWidget):
    def __init__(self, parent=None):
        super(HandlerWindow, self).__init__()
        self.resize(300,350)
        self.label = CustomLabel(self)
        self.label.setPixmap(QPixmap("imagem.jpg").scaled(250,150, Qt.KeepAspectRatio))

    def mouseMoveEvent(self, e):
        QApplication.setOverrideCursor(Qt.PointingHandCursor)

    def leaveEvent(self, e):
        QApplication.setOverrideCursor(Qt.ArrowCursor)

    def closeEvent(self, e):
        e.ignore()
        question_close = QMessageBox.question(self, "Fechamento", "Deseja realmente fechar a aplicação?",
                                              QMessageBox.Yes, QMessageBox.No)
        if question_close == QMessageBox.Yes:
            exit(0)

root = QApplication([])
app = HandlerWindow()
app.show()
sys.exit(root.exec_())

EDIT:

It has QPixmap in the Qt class tb. I tried here and got the same result as using the QtGui class. He is opening the first image and clicking on the image he opens the explorer so I can get a new image to be viewed, but it is not changing the image of the cursor when passing through the image

from PyQt5.QtWidgets import (QApplication, QWidget, QPushButton, QLineEdit,
                            QHBoxLayout, QMessageBox, QRadioButton, QGroupBox,
                            QVBoxLayout,QLabel,QFileDialog)

from PyQt5.Qt import (Qt,QPixmap)

import sys

class CustomLabel(QLabel):
    def __init__(self, parent=None):
        super(CustomLabel, self).__init__(parent)
        self.setMouseTracking(True)

    def mousePressEvent(self, e):
        img, re = QFileDialog.getOpenFileName(self, "Selecionar Arquivo", filter="All(*.png *.jpg)")
        if re:
            self.setPixmap(QPixmap(img).scaled(800, 800, Qt.KeepAspectRatio))

class HandlerWindow(QWidget):
    def __init__(self, parent=None):
        super(HandlerWindow, self).__init__()
        self.resize(800,650)
        self.label = CustomLabel(self)
        self.label.setPixmap(QPixmap("imagem.jpg").scaled(800,800, Qt.KeepAspectRatio))

    def mouseMoveEvent(self, e):
        QApplication.setOverrideCursor(Qt.PointingHandCursor)

    def leaveEvent(self, e):
        QApplication.setOverrideCursor(Qt.ArrowCursor)


root = QApplication([])
app = HandlerWindow()
app.show()
sys.exit(root.exec_())

python python-3.x pyqt-5

asked by anonymous 12.10.2017 / 00:26

1 answer

Vector union DateTime does not update in Console.WriteLine [closed]

score 2 · Accepted Answer

QPixmap is from QtGui:

from PyQt5.QtGui import (QPixmap)
                         ^^^^^^^

Even if used indirectly, Py needs its import . PyQt is a wrapper for the implementation in C ++, and needs to "know" the layers that make the adaptation of each of the classes.

Taking advantage of it, it could be the case of using an intermediate variable, if you reuse the image (although Qt deals well internally with these situations):

pix = QPixmap("imagem.jpg")
self.label.setPixmap(pix.scaled(250,150, Qt.KeepAspectRatio))

Remember that in case of using many classes, you can do something like this (each case is a case, of course) but you would have to prefix the classes:

from PyQt5 import QtCore, QtGui, QtWidgets