drag-and-drop - 从 QTabWidget 拖放选项卡

Question

我正在尝试从选项卡小部件中拖动一个选项卡并拆分查看区域(- 就像 eclipse 然后将选项卡标题拖动到编辑区域中一样 - 类似于 PyCharm 中选项卡上的“垂直拆分”功能) .

我尝试使用拖放但无法让选项卡主区域(例如文本区域)注册来自 QTabBar 的拖动。然后我尝试只跟随鼠标移动并更进一步，但是拆分器代码不是很有效，而且它是非常难看的代码。

注意我没有使用可停靠小部件，因为此代码将用于应用程序的中央小部件。我更喜欢使用拖放来执行此操作 - 谁有任何想法？

from PyQt4.QtGui import QWidget, QDrag, QTabBar, QTabWidget, QPainter, QPalette,\
QBrush, QColor, QPen, QVBoxLayout, QHBoxLayout, QTextEdit, QCheckBox
from PyQt4.QtCore import QByteArray, QMimeData, QPoint
from PyQt4 import QtCore, QtGui

class CentralTabWidget(QTabWidget):

    def __init__(self, parent=None):
        QTabWidget.__init__(self, parent)
        self.parent = parent

        tabBar = CentralTabBar(self)
        self.setTabBar(tabBar)
        self.addWidgets()

    def addWidgets(self):
        tab1 = QWidget()
        self.addTab(tab1, "Tab1")
        textArea = QTextEdit()
        textArea.setText("Text area 1")
        vBox = QVBoxLayout()
        vBox.addWidget(textArea)
        tab1.setLayout(vBox)
        tab2 = QWidget()
        self.addTab(tab2, "Tab2")
        textArea2 = QTextEdit()
        textArea2.setText("Text area 2")
        vBox2 = QVBoxLayout()
        vBox2.addWidget(textArea2)
        tab2.setLayout(vBox2)
        self.setAcceptDrops(True)
        self.verticalLineOverlay = Overlay(parent = self)
        self.verticalLineOverlay.hide()

    def dragEnterEvent(self, event):
        mimeData = event.mimeData()
        event.accept()

    def dragMoveEvent(self, event):
        print(">>dragMoveEvent()")

    def dropEvent(self, event):
        mimeData = event.mimeData()
        event.setDropAction(QtCore.Qt.MoveAction)
        event.accept()

    def resizeEvent(self, event):    
        self.verticalLineOverlay.resize(event.size())
        event.accept()

class CentralTabBar(QTabBar):   
    def __init__(self, parent=None):
        QTabBar.__init__(self, parent)
        self.parent = parent
        self.__drag_start_pos = QPoint()
        self.setAcceptDrops(True)

    def mousePressEvent(self, event):
        self.__mousePressPos = None
        self.__mouseMovePos = None
        if event.button() == QtCore.Qt.LeftButton:
            self.__mousePressPos = event.globalPos()
            self.__mouseMovePos = event.globalPos()
            if self.parent.parent.dndCheckBox.isChecked():
                self.startDrag()
        super(CentralTabBar, self).mousePressEvent(event)

    def mouseReleaseEvent(self, event):
        self.parent.verticalLineOverlay.setVisible(False)
        currPos = self.mapToGlobal(self.pos())
        ax, ay, aw, ah = self.geometry().getRect()
        if currPos.x() > ax + aw/4:
            self.parent.parent.createSplitter()
        super(CentralTabBar, self).mouseReleaseEvent(event)

    def mouseMoveEvent(self, event):
        if event.buttons() == QtCore.Qt.LeftButton:
            currPos = self.mapToGlobal(self.pos())
            globalPos = event.globalPos()
            diff = globalPos - self.__mouseMovePos
            newPos = self.mapFromGlobal(currPos + diff)
            xp1, yp1, xp2, yp2 = self.geometry().getCoords()
            ax, ay, aw, ah = self.geometry().getRect()
            parentx, parenty, parentw, parenth = self.parent.geometry().getCoords()
            if parenth > 10:
                if (newPos.y() > yp2) and (newPos.y() < (parenth)):
                    self.parent.verticalLineOverlay.setVisible(True)
        super(CentralTabBar, self).mouseMoveEvent(event)

    def startDrag(self):
        data = QByteArray()
        mimeData = QMimeData()
        mimeData.setData("application/x-icon-and-text", data)
        print("Using DnD")
        drag = QDrag(self)
        drag.setMimeData(mimeData)
        drag.exec_()

    def dragEnterEvent(self, event):
        event.accept()

    def dragMoveEvent(self, event):
        print("--dragMoveEvent()")

    def dropEvent(self, event):
        event.setDropAction(QtCore.Qt.MoveAction)
        event.accept()

class Overlay(QWidget):    
    def __init__(self, parent=None):        
        super(Overlay, self).__init__(parent)
        print("--__init__() parent type:{0}".format(type(parent))) 
        self.parent = parent
        palette = QPalette(self.palette())
        palette.setColor(palette.Background, QtCore.Qt.transparent)
        self.setPalette(palette)

    def paintEvent(self, event):  
        self.painter = QPainter()
        self.painter.setPen(QPen(QtCore.Qt.NoPen))
        self.painter.begin(self)
        self.painter.setRenderHint(QPainter.Antialiasing)
        self.painter.fillRect(self.parent.currentWidget().geometry(), QBrush(QColor(255, 255, 255, 10)))
        parentx, parenty, parentw, parenth = self.parent.geometry().getCoords()
        self.painter.drawRect( parentx, parenty, (parentw/2)-10, parenth)   
        self.painter.drawRect( (parentw/2)+10, parenty, parentw, parenth)        
        self.painter.setPen(QPen(QtCore.Qt.NoPen)) 

    def setUpPainter(self):
        self.painter = QPainter()
        self.painter.setPen(QPen(QtCore.Qt.NoPen))
        self.painter.begin(self)
        self.painter.setRenderHint(QPainter.Antialiasing)
        self.painter.fillRect(self.parent.currentWidget().geometry(), QBrush(QColor(255, 255, 255, 10)))
        parentx, parenty, parentw, parenth = self.parent.geometry().getCoords()

class Window(QtGui.QWidget):
    def __init__(self):
        QtGui.QWidget.__init__(self)
        self.layout = QHBoxLayout()
        self.dndCheckBox = QCheckBox("Use DnD")
        self.dndCheckBox.setChecked(True)
        self.ctw = CentralTabWidget(self)
        self.layout.addWidget(self.ctw)
        self.layout.addWidget(self.dndCheckBox)
        self.setLayout(self.layout)

    def createSplitter(self):
        #not sure why widgets are not redrawn inside the splitter
        splitter1 = QtGui.QSplitter(QtCore.Qt.Horizontal)
        self.removeWidgets(self.layout)
        splitter1.addWidget(self.ctw)
        self.layout.addWidget(splitter1)
        self.layout.addWidget(self.dndCheckBox)

    def removeWidgets(self, layout):
        for cnt in reversed(range(layout.count())):
            widget = layout.takeAt(cnt).widget()
            if widget is not None: 
                widget.deleteLater()

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.resize(350, 300)
    window.show()
    sys.exit(app.exec_())

我尝试在 QMainMaindow 中使用 QMainWindow:

from PyQt4 import QtCore, QtGui
from PyQt4.QtGui import QMainWindow, QTextEdit, QDockWidget

_DOCK_OPTS = QtGui.QMainWindow.AllowNestedDocks
_DOCK_OPTS |= QtGui.QMainWindow.AllowTabbedDocks

class Window(QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        secondQMainWindow = QMainWindow()
        self.central = secondQMainWindow
        self.setDockOptions(_DOCK_OPTS)
        dw1 = QDockWidget("One")
        textArea = QTextEdit()
        textArea.setText("Text area 1")
        dw1.setWidget(textArea)

        dw2 = QDockWidget("Two")
        textArea2 = QTextEdit()
        textArea2.setText("Text area 2")
        dw2.setWidget(textArea2)
        self.addDockWidget(QtCore.Qt.LeftDockWidgetArea, dw1)
        self.addDockWidget(QtCore.Qt.RightDockWidgetArea, dw2)
        self.tabifyDockWidget(dw1, dw2)
        dw3 = QDockWidget("Three")
        textArea3 = QTextEdit()
        textArea3.setText("Text area 3")
        dw3.setWidget(textArea3)
        self.addDockWidget(QtCore.Qt.LeftDockWidgetArea, dw3)

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.show()
    app.exec_()

但我认为我没有正确地将小部件添加到父与子中央小部件。

Answer 1

这是我过去用过的一个技巧来完成您正在寻找的事情。如果您想对参数进行大量控制，它可能会非常有限，但它可以完成工作。

1. 将第二个 QMainWindow 作为 QMainWindow 的 centralWidget。
2. 不要为第二个 QMainWindow 设置任何 centralWidget。

3. 设置标志:QMainWindow.AllowNestedDocks 和 QMainWindow.AllowTabbedDocks

4. 通过添加 QDockWidgets 添加标签。这些将被自动威胁为 QTabWidgets。

5. 使用 QMainWindow.tabifyDockWidget(firstWidget,secondWidget) 以编程方式堆叠小部件(它可以多次用于超过 2 个小部件)

示例:

window=QtGui.QMainWindow()
    window.centralContent=QtGui.QMainWindow()

window.setCentralWidget(window.centralContent)

window.centralContent.firstTabWidget=QtGui.QWidget()
window.centralContent.firstTabDock=QtGui.QDockWidget("first")
window.centralContent.firstTabDock.setWidget(window.centralContent.firstTabWidget)
window.centralContent.addDockWidget(window.centralContent.firstTabDock)
 window.centralContent.secondTabWidget=QtGui.QWidget()
window.centralContent.secondTabDock=QtGui.QDockWidget("second")
window.centralContent.secondTabDock.setWidget(window.centralContent.secondTabWidget)
window.centralContent.addDockWidget(window.centralContent.secondTabDock)

window.centralContent.tabifyDockWidget( window.centralContent.firstTabDock, window.centralContent.secondTabDock)