pyqt - 如何在 qdialog 上显示图像？

Question

请帮助这个代码，因为我真的不明白这个概念。我通过单击 qwidget 上的按钮来启动一个对话框。我还想通过单击对话框上的不同按钮 (img_btn) 在上述 qdialog 上显示图像。我在下面添加了一些代码：

from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys

class BasicWidget(QWidget):
    def __init__(self, parent=None):
        super(BasicWidget, self).__init__()

        layout = QVBoxLayout()
        self.btn = QPushButton('Show Dialog')
        layout.addWidget(self.btn)
        self.setLayout(layout)
        self.show()

        self.btn.clicked.connect(self.showpic)

    def showpic(self):
        imgshow = PaintPicture()

class PaintPicture(QDialog):
    def __init__(self, parent=None):
        super(PaintPicture, self).__init__()

        layout = QVBoxLayout()
        self.img_btn = QPushButton('Enter')
        layout.addWidget(self.img_btn)

        filename = r'\\some\basic\picture.jpg'
        image = QImage(filename )

        self.imageLabel = QLabel()
        self.imageLabel.setPixmap(QPixmap.fromImage(image))

        layout.addWidget(self.imageLabel)

        self.setLayout(layout)
        self.show()

if __name__ =="__main__":
    app = QApplication(sys.argv)
    widget = BasicWidget()
    sys.exit(app.exec_())

Answer 1

首先，您的代码中有两个错误：

1. imgshow = PaintPicture()应该self.imgshow = PaintPicture()

2. path 对我不起作用filename = r'\\some\basic\picture.jpg'，但它是这样工作的：filename = r'./some/basic/picture.jpg'

现在，如果我理解，您想打开只有“输入”按钮的对话框。当您按下该按钮时，您希望图像显示在按钮下方的同一对话框中吗？如果是这样，这是代码：

from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys

class BasicWidget(QWidget):
    def __init__(self, parent=None):
        super(BasicWidget, self).__init__()

        layout = QVBoxLayout()
        self.btn = QPushButton('Show Dialog')
        layout.addWidget(self.btn)
        self.setLayout(layout)
        self.show()

        self.btn.clicked.connect(self.showpic)

    def showpic(self):
        self.imgshow = PaintPicture()

class PaintPicture(QDialog):
    def __init__(self, parent=None):
        super(PaintPicture, self).__init__()

        layout = QVBoxLayout()
        self.img_btn = QPushButton('Enter')
        self.img_btn.clicked.connect(self.showImage)
        layout.addWidget(self.img_btn)

        self.setLayout(layout)
        self.show()

    def showImage(self):
        filename = r'./some/basic/picture.jpg'
        image = QImage(filename )

        self.imageLabel = QLabel()
        self.imageLabel.setPixmap(QPixmap.fromImage(image))

        layout = self.layout()
        layout.addWidget(self.imageLabel)

if __name__ =="__main__":
    app = QApplication(sys.argv)
    widget = BasicWidget()
    sys.exit(app.exec_())