QMenuBar下的QMDISubWindow

Question

在我的PyQt程序中，我有一个启动QMDISubWindow小部件的QMenuBar。默认情况下，它在(0，0)附近启动。我对其进行了修改，使其自动向下移动小部件(如下所示)。

def check_position(self, y, width, height, sub_window):
    if y <= 40:
        sub_window.move(randint(0, self.width - width), randint(0, self.height - height))
        print("Sub Window Moved")

这会将QMDISubWindow向下移动，但在全屏或向上拖动时，QMDISubWindow会在QMenuBar下面。你将如何解决这个问题？

仅供参考。完整的代码可在Github上找到。

Answer 1

试试看：

import sys
from random import randint

from PyQt5.QtWidgets import (QApplication, QMainWindow, QAction, QMenuBar, QWidget,
                             QMdiArea, QMdiSubWindow, QProxyStyle, QStyle, QVBoxLayout)
from PyQt5.QtGui     import (QIcon, QPainter, QPalette, QPixmap)
from PyQt5.QtCore    import Qt

from Browser_Tabbed import browser_tabbed
from Calculator     import calculator
from Notepad        import notepad
from Paint          import paint
from Solitaire      import solitaire


class MDIArea(QMdiArea):
    def __init__(self, *args, **kwargs):
        super(MDIArea, self).__init__(*args, **kwargs)  
        self.parent = args[0]
        self.background_pixmap = self.parent.pixmap 
        self.centered          = False
        self.display_pixmap    = None

    def paintEvent(self, event):
        painter = QPainter()
        painter.begin(self.viewport())
        if not self.centered:
            painter.drawPixmap(0, 0, self.width(), self.height(), self.background_pixmap)
        else:
            painter.fillRect(event.rect(), self.palette().color(QPalette.Window))
            x = (self.width() - self.display_pixmap.width())/2
            y = (self.height() - self.display_pixmap.height())/2
            painter.drawPixmap(x, y, self.display_pixmap)
        painter.end()

    def resizeEvent(self, event):
        self.display_pixmap = self.background_pixmap.scaled(self.parent.window_width(), 
                                                            self.parent.window_height(), 
                                                            Qt.KeepAspectRatio)

class MyProxyStyle(QProxyStyle):
    def pixelMetric(self, QStyle_PixelMetric, option=None, widget=None):
        if QStyle_PixelMetric == QStyle.PM_SmallIconSize:
            return 40
        else:
            return QProxyStyle.pixelMetric(self, QStyle_PixelMetric, option, widget)


class Desktop(QMainWindow):
    def __init__(self):
        super(Desktop, self).__init__()
        self.widthDesktop  = 900         # widthDesktop  +++
        self.heightDesktop = 650         # heightDesktop +++

        self.title = "Remote Desktop"
        self.left  = 200 
        self.top   = 70 

        self.initUI()
        self.create_mdi()                    # +++
        self.create_menu()                   # +++

        # +++
        self.centerWidget = QWidget(self)
        layout            = QVBoxLayout()  
        layout.addWidget(self.menu)
        layout.addWidget(self.mdi)
        self.centerWidget.setLayout(layout)
        self.setCentralWidget(self.centerWidget)

        self.show()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.widthDesktop, self.heightDesktop)

    def check_position(self, y, width, height, sub_window):
#        if y <= 40:
#            sub_window.move(randint(0, self.widthDesktop - width), 
#                            randint(0, self.heightDesktop - height) ) 
        if width < 500: 
            sub_window.move(randint(0, self.widthDesktop-(int(self.widthDesktop/2))), 
                            randint(0, self.heightDesktop-(int(self.heightDesktop/2))) ) 
        else:
            sub_window.move(randint(0, self.widthDesktop-(int(self.widthDesktop/1.5))), 
                            randint(0, self.heightDesktop-(int(self.heightDesktop/1.5))) )        

        print("Sub Window Moved")

    @staticmethod
    def close_desktop():
        print("Closing Remote Desktop")
        exit(0)

    def open_browser(self):
        print("Opening Browser")
        sub = QMdiSubWindow()
        sub.setWidget(browser_tabbed.MainWindow())
        sub.setWindowTitle("Browser")
        self.mdi.addSubWindow(sub)
        widget_position = sub.pos()
        widget_dimensions = sub.frameGeometry()
        self.check_position(y=widget_position.y(), width=widget_dimensions.width(), height=widget_dimensions.height(), sub_window=sub)
        sub.show()

    def open_calculator(self):
        print("Opening Calculator")
        sub = QMdiSubWindow()
        sub.setWidget(calculator.MainWindow())
        sub.setWindowTitle("Calculator")
        self.mdi.addSubWindow(sub)
        widget_position = sub.pos()
        widget_dimensions = sub.frameGeometry()
        self.check_position(y=widget_position.y(), width=widget_dimensions.width(), height=widget_dimensions.height(), sub_window=sub)
        sub.show()

    def open_notepad(self):
        print("Opening Notepad")
        sub = QMdiSubWindow()
        sub.setWidget(notepad.MainWindow())
        sub.setWindowTitle("Notepad")
        self.mdi.addSubWindow(sub)
        widget_position = sub.pos()
        widget_dimensions = sub.frameGeometry()
        self.check_position(y=widget_position.y(), width=widget_dimensions.width(), height=widget_dimensions.height(), sub_window=sub)
        sub.show()

    def open_paint(self):
        print("Opening Paint")
        sub = QMdiSubWindow()
        sub.setWidget(paint.MainWindow())
        sub.setWindowTitle("Paint")
        self.mdi.addSubWindow(sub)
        widget_position = sub.pos()
        widget_dimensions = sub.frameGeometry()
        self.check_position(y=widget_position.y(), width=widget_dimensions.width(), height=widget_dimensions.height(), sub_window=sub)
        sub.show()

    def open_solitaire(self):
        print("Opening Solitaire")
        sub = QMdiSubWindow()
        sub.setWidget(solitaire.MainWindow())
        sub.setWindowTitle("Solitaire")
        self.mdi.addSubWindow(sub)
        widget_position = sub.pos()
        widget_dimensions = sub.frameGeometry()
        self.check_position(y=widget_position.y(), width=widget_dimensions.width(), height=widget_dimensions.height(), sub_window=sub)
        sub.show()

    def create_menu(self):
        self.menu = QMenuBar(self)
        self.menu.setNativeMenuBar(False)

        exitButton = QAction(QIcon("Power.jpeg"), "Exit", self)
        exitButton.setShortcut("Ctrl+Q")
        exitButton.setStatusTip("Power Off")

        browser = QAction(QIcon("browser.jpeg"), "Boron", self)
        browser.setShortcut("Ctrl+B")
        browser.setStatusTip("Open Browser")

        calculator = QAction(QIcon("Calculator.jpeg"), "Cobalt", self)
        calculator.setShortcut("Ctrl+C")
        calculator.setStatusTip("Open Calculator")

        notepad = QAction(QIcon("Notepad.png"), "Neon", self)
        notepad.setShortcut("Ctrl+N")
        notepad.setStatusTip("Open Notepad")

        paint = QAction(QIcon("Paint.png"), "Paint", self)
        paint.setShortcut("Ctrl+P")
        paint.setStatusTip("Open Paint")

        solitaire = QAction(QIcon("Solitaire.jpeg"), "Xenon", self)
        solitaire.setShortcut("Ctrl+S")
        solitaire.setStatusTip("Open Solitaire")

        self.menu.addAction(exitButton)
        self.menu.addAction(browser)
        self.menu.addAction(calculator)
        self.menu.addAction(notepad)
        self.menu.addAction(paint)
        self.menu.addAction(solitaire)

        # +++
        self.menu.addAction("Cascade")
        self.menu.addAction("Tiled")
        self.menu.triggered[QAction].connect(self.windowaction)

        exitButton.triggered.connect(self.close_desktop)
        browser.triggered.connect(self.open_browser)
        calculator.triggered.connect(self.open_calculator)
        notepad.triggered.connect(self.open_notepad)
        paint.triggered.connect(self.open_paint)
        solitaire.triggered.connect(self.open_solitaire)

    # +++     
    def windowaction(self, q): 
        if q.text()=="Cascade":
            self.mdi.cascadeSubWindows()
        if q.text()=="Tiled":
            self.mdi.tileSubWindows()


    def window_width(self):
        self.widthDesktop = self.width()                     # +++
        return self.widthDesktop 

    def window_height(self):
        self.heightDesktop = self.height()                   # +++
        return self.heightDesktop 

    def create_mdi(self):
        self.pixmap = QPixmap()
        self.pixmap.load("mt-mckinley.jpg")
        #self.mdi = MDIArea(self.pixmap)     
        self.mdi = MDIArea(self)
        #self.setCentralWidget(self.mdi)
        #self.mdi.cascadeSubWindows()



if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex  = Desktop()
    #ex.create_mdi()
    #ex.create_menu()
    my_style = MyProxyStyle("Fusion")
    app.setStyle(my_style)
    app.exec_()

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