如何添加“新标签"?在选项卡式视图模式下 QMdiArea 选项卡旁边的按钮?

问题描述：

我希望为我的 QMdiArea 设置一个类似于 Chrome 或 Firefox 的新标签"按钮.

I'd like to have a "new tab" button much like Chrome or Firefox has for my QMdiArea.

我可以在某处创建一个按钮或菜单项，为 MDI 内容添加一个新的子文档，但是我怎样才能使它成为一个带有+"作为标签的视觉上吸引人的小标签?或者，我会对带有这样一个按钮的 QTabWidget 感到满意.

I can make a button or menu item somewhere that adds a new subdocument to the MDI thing, but how can I make it a visually appealing tiny tab with a "+" as label? Alternatively, I would be happy enough with a QTabWidget with such a button.

答

您必须为 QTabBar 编写自己的类.可以使用绝对定位添加加号按钮.

You will have to write your own class for the QTabBar. The plus button can be added by using absolute positioning.

我这里有一些 PySide 的代码；它应该给你基本的想法.

I have some code here for PySide; it should give you the basic idea.

class TabBarPlus(QtGui.QTabBar):
    """Tab bar that has a plus button floating to the right of the tabs."""

    plusClicked = QtCore.Signal()

    def __init__(self):
        super().__init__()

        # Plus Button
        self.plusButton = QtGui.QPushButton("+")
        self.plusButton.setParent(self)
        self.plusButton.setFixedSize(20, 20)  # Small Fixed size
        self.plusButton.clicked.connect(self.plusClicked.emit)
        self.movePlusButton() # Move to the correct location
    # end Constructor

    def sizeHint(self):
        """Return the size of the TabBar with increased width for the plus button."""
        sizeHint = QtGui.QTabBar.sizeHint(self) 
        width = sizeHint.width()
        height = sizeHint.height()
        return QtCore.QSize(width+25, height)
    # end tabSizeHint

    def resizeEvent(self, event):
        """Resize the widget and make sure the plus button is in the correct location."""
        super().resizeEvent(event)

        self.movePlusButton()
    # end resizeEvent

    def tabLayoutChange(self):
        """This virtual handler is called whenever the tab layout changes.
        If anything changes make sure the plus button is in the correct location.
        """
        super().tabLayoutChange()

        self.movePlusButton()
    # end tabLayoutChange

    def movePlusButton(self):
        """Move the plus button to the correct location."""
        # Find the width of all of the tabs
        size = sum([self.tabRect(i).width() for i in range(self.count())])
        # size = 0
        # for i in range(self.count()):
        #     size += self.tabRect(i).width()

        # Set the plus button location in a visible area
        h = self.geometry().top()
        w = self.width()
        if size > w: # Show just to the left of the scroll buttons
            self.plusButton.move(w-54, h)
        else:
            self.plusButton.move(size, h)
    # end movePlusButton
# end class MyClass

class CustomTabWidget(QtGui.QTabWidget):
    """Tab Widget that that can have new tabs easily added to it."""

    def __init__(self):
        super().__init__()

        # Tab Bar
        self.tab = TabBarPlus()
        self.setTabBar(self.tab)

        # Properties
        self.setMovable(True)
        self.setTabsClosable(True)

        # Signals
        self.tab.plusClicked.connect(self.addTab)
        self.tab.tabMoved.connect(self.moveTab)
        self.tabCloseRequested.connect(self.removeTab)
    # end Constructor
# end class CustomTabWidget

如何添加“新标签"?在选项卡式视图模式下 QMdiArea 选项卡旁边的按钮?

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