Question

我的流程很简单：用户单击一个按钮，出现一个QDialog弹出窗口，我希望渲染一个MenuBar和一个在MenuBar下面的图像（渲染发生在paintEvent期间）。

import sys

from PyQt5 import QtGui
from PyQt5.QtGui import QPixmap
from PyQt5.QtWidgets import QMainWindow, QApplication, QPushButton, QDialog, QMenuBar, QAction, QHBoxLayout


class Example(QMainWindow):
    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.button = QPushButton()
        self.button.setText("Click")
        self.button.setMaximumHeight(100)
        self.button.setMaximumWidth(100)
        self.button.clicked.connect(self.clicked)

        self.layout().addWidget(self.button)

        self.show()

    def clicked(self):
        self.something = SecondExample()
        self.something.exec()

class SecondExample(QDialog):
    def __init__(self):
        super().__init__()
        self.installEventFilter(self)

        layout = QHBoxLayout()

        toolbar = QMenuBar()
        toolbar.addAction(QAction("Edit", toolbar))
        toolbar.addAction(QAction("Polygon", toolbar))
        toolbar.addAction(QAction("Rectangle", toolbar))

        layout.setMenuBar(toolbar)

        self.setLayout(layout)

        self.pixmap = QPixmap(r"C:\Users\kjankosk\Desktop\Panasonic-OLED-TV-FZ950-Lifestyle.jpg")
        self.resize(self.pixmap.width(), self.pixmap.height())


    def paintEvent(self, event):
        super().paintEvent(event)

        painter = QtGui.QPainter(self)
        painter.setRenderHint(QtGui.QPainter.Antialiasing, True)

        painter.drawPixmap(self.rect(), self.pixmap)



if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

这里是我到目前为止（可编辑图像路径）的可复制示例，但是图像的一部分显示在菜单栏的后面。如何解决此问题？我认为主要问题在于rect（）调用，因为它似乎正在使用整个窗口，但我希望菜单栏位于“窗口外部”

Answer 1

一种可能的解决方案是给出一个偏移量，如S.Nick所示，但是如您所见，第一个缺点是计算取决于样式和OS的偏移量。因此，另一种可能的解决方案是在显示图像的地方创建另一个小部件，并将其添加到布局中：

# ...
class Widget(QWidget):
    def __init__(self):
        super().__init__()

        self.pixmap = QPixmap(
            r"C:\Users\kjankosk\Desktop\Panasonic-OLED-TV-FZ950-Lifestyle.jpg"
        )

    def paintEvent(self, event):
        super().paintEvent(event)
        painter = QtGui.QPainter(self)
        painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
        painter.drawPixmap(self.rect(), self.pixmap)

    def sizeHint(self):
        return self.pixmap.size()


class SecondExample(QDialog):
    def __init__(self):
        super().__init__()

        layout = QHBoxLayout(self)

        toolbar = QMenuBar()
        toolbar.addAction(QAction("Edit", toolbar))
        toolbar.addAction(QAction("Polygon", toolbar))
        toolbar.addAction(QAction("Rectangle", toolbar))

        layout.setMenuBar(toolbar)

        widget = Widget()
        layout.addWidget(widget)
# ...

Answer 2

尝试一下：

import sys
from PyQt5 import QtGui
from PyQt5.QtGui import QPixmap
from PyQt5.QtWidgets import (QMainWindow, QApplication, QPushButton, QDialog, 
                             QMenuBar, QAction, QHBoxLayout, QWidget, QGridLayout)

class SecondExample(QDialog):
    def __init__(self):
        super().__init__()
        self.installEventFilter(self)

        toolbar = QMenuBar()
        toolbar.addAction(QAction("Edit", toolbar))
        toolbar.addAction(QAction("Polygon", toolbar))
        toolbar.addAction(QAction("Rectangle", toolbar))

        layout = QHBoxLayout()
        layout.setMenuBar(toolbar)
        self.setLayout(layout)

        self.pixmap = QPixmap("D:/_Qt/__Qt/img/max1.jpg")      # py-qt.png
        self.resize(self.pixmap.width(), self.pixmap.height())

    def paintEvent(self, event):
        super().paintEvent(event)

        painter = QtGui.QPainter(self)
        painter.setRenderHint(QtGui.QPainter.Antialiasing, True)

#        painter.drawPixmap(self.rect(), self.pixmap)
        rect = self.rect().x(), self.rect().y()+20, self.rect().width(), self.rect().height()-20 # +++
        painter.drawPixmap(*rect, self.pixmap)                                                   # +++


class Example(QMainWindow):
    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):
        self.button = QPushButton(self)
        self.button.setText("Click")
        self.button.setMaximumHeight(100)
        self.button.setMaximumWidth(100)
        self.button.clicked.connect(self.clicked)

        centralWidget = QWidget()
        self.setCentralWidget(centralWidget)
        layout = QGridLayout(centralWidget)
#        self.layout().addWidget(self.button)
        layout.addWidget(self.button)

    def clicked(self):
        self.something = SecondExample()
        self.something.show()            # exec()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    ex.show()
    sys.exit(app.exec_())

在PyQt的菜单栏下方显示图像

2 个答案: