PySide：如何在拖动按钮时将按钮捕捉到某个位置？

Question

我有一个应用程序，可以在窗口中自由拖动按钮。我想在窗口的一部分上放一些插槽，可以将按钮放入其中。如果我将其放在一个插槽附近，则希望按钮锁定在该插槽中。

我将如何实施广告位？我在想像书架这样简单的东西。

编辑：我添加了实现5个可移动标签的代码。我正在尝试做的是能够通过拖放来重新排列标签。如果我将一个标签移到另一个标签的上方，则希望两个标签交换位置。

这是我有5个可移动标签的代码：

import sys
from PySide import QtGui
from PySide import QtCore
from PySide.QtGui import *
from PySide.QtCore import *
from Drag import Ui_Dialog

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
    self.mainMenuWidget = MainStack(self)   
    self.setCentralWidget(self.mainMenuWidget)
        self.show()


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

    def initUI(self):
        layout = QVBoxLayout(self)
        self.stack = QStackedWidget(parent=self)
        self.dragPage = DragClass()
        #Add Pages to Stack
        self.stack.addWidget(self.dragPage)
        #Add Stack to Layout    
        self.stack.setCurrentWidget(self.dragPage)
        layout.addWidget(self.stack)

class DragClass(QDialog):
    def __init__(self, parent=None):
        super(DragClass, self).__init__(parent)
        self.LabelGrid = Ui_Dialog()
        self.LabelGrid.setupUi(self)
        self.configureLabels() 

    def configureLabels(self):
        labels = (self.LabelGrid.verticalLayout.itemAt(i) for i in range(self.LabelGrid.verticalLayout.count()))
        for label in labels:
            label = label.widget()
            if (isinstance(label,DragButton)) :
                label.setSizePolicy(QSizePolicy.Preferred,QSizePolicy.Expanding)
                label.setStyleSheet("""
                    background-color: lightblue;
                    border-width: 2px;
                    border-style: solid;
                    border-color: black;
                    margin: 2px;
                """)

#########DragButton Class#############
class DragButton(QLabel):

    def mousePressEvent(self, event):
        self.__mousePressPos = None
        self.__mouseMovePos = None
        if event.button() == QtCore.Qt.LeftButton:
            self.__mousePressPos = event.globalPos()
            self.__mouseMovePos = event.globalPos()
        self.start_move = 0
        super(DragButton, self).mousePressEvent(event)

    def mouseMoveEvent(self, event):
        if event.buttons() == QtCore.Qt.LeftButton:
            # adjust offset from clicked point to origin of widget
            currPos = self.mapToGlobal(self.pos())
            globalPos = event.globalPos()
            diff = globalPos - self.__mouseMovePos
            newPos = self.mapFromGlobal(currPos + diff)
            self.move(newPos)

            self.__mouseMovePos = globalPos

    #If you Uncomment these blocks, the labels are no longer able to move freely. They snap back to their original position when released

            #if not self.start_move: 
                #self.setStyleSheet("background-color: red;")

            #if not self.start_move:
                #self.start_move = 1


        super(DragButton, self).mouseMoveEvent(event)

    def mouseReleaseEvent(self, event):
        if self.__mousePressPos is not None:


        #if self.start_move:
            #self.setStyleSheet("background-color: lightblue;")

            moved = event.globalPos() - self.__mousePressPos

            if moved.manhattanLength() > 3:
                event.ignore()
                return

        super(DragButton, self).mouseReleaseEvent(event)
##############################################


if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainWin = MainWindow()
    ret = app.exec_()
    sys.exit( ret )

可拖动标签的UI类：

from PySide import QtCore, QtGui

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(400, 300)
        self.gridLayout = QtGui.QGridLayout(Dialog)
        self.gridLayout.setObjectName("gridLayout")
        self.verticalLayout = QtGui.QVBoxLayout()
        self.verticalLayout.setObjectName("verticalLayout")
        self.option1 = DragButton(Dialog)
        font = QtGui.QFont()
        font.setWeight(75)
        font.setBold(True)
        self.option1.setFont(font)
        self.option1.setFrameShape(QtGui.QFrame.StyledPanel)
        self.option1.setFrameShadow(QtGui.QFrame.Raised)
        self.option1.setAlignment(QtCore.Qt.AlignCenter)
        self.option1.setObjectName("option1")
        self.verticalLayout.addWidget(self.option1)
        self.option2 = DragButton(Dialog)
        font = QtGui.QFont()
        font.setWeight(75)
        font.setBold(True)
        self.option2.setFont(font)
        self.option2.setFrameShape(QtGui.QFrame.StyledPanel)
        self.option2.setFrameShadow(QtGui.QFrame.Raised)
        self.option2.setAlignment(QtCore.Qt.AlignCenter)
        self.option2.setObjectName("option2")
        self.verticalLayout.addWidget(self.option2)
        self.Option3 = DragButton(Dialog)
        font = QtGui.QFont()
        font.setWeight(75)
        font.setBold(True)
        self.Option3.setFont(font)
        self.Option3.setFrameShape(QtGui.QFrame.StyledPanel)
        self.Option3.setFrameShadow(QtGui.QFrame.Raised)
        self.Option3.setAlignment(QtCore.Qt.AlignCenter)
        self.Option3.setObjectName("Option3")
        self.verticalLayout.addWidget(self.Option3)
        self.Option4 = DragButton(Dialog)
        font = QtGui.QFont()
        font.setWeight(75)
        font.setBold(True)
        self.Option4.setFont(font)
        self.Option4.setFrameShape(QtGui.QFrame.StyledPanel)
        self.Option4.setFrameShadow(QtGui.QFrame.Raised)
        self.Option4.setLineWidth(1)
        self.Option4.setMidLineWidth(0)
        self.Option4.setAlignment(QtCore.Qt.AlignCenter)
        self.Option4.setTextInteractionFlags(QtCore.Qt.NoTextInteraction)
        self.Option4.setObjectName("Option4")
        self.verticalLayout.addWidget(self.Option4)
        self.Option5 = DragButton(Dialog)
        font = QtGui.QFont()
        font.setWeight(75)
        font.setBold(True)
        self.Option5.setFont(font)
        self.Option5.setFrameShape(QtGui.QFrame.StyledPanel)
        self.Option5.setFrameShadow(QtGui.QFrame.Raised)
        self.Option5.setLineWidth(1)
        self.Option5.setMidLineWidth(0)
        self.Option5.setAlignment(QtCore.Qt.AlignCenter)
        self.Option5.setTextInteractionFlags(QtCore.Qt.NoTextInteraction)
        self.Option5.setObjectName("Option5")
        self.verticalLayout.addWidget(self.Option5)
        self.gridLayout.addLayout(self.verticalLayout, 0, 0, 1, 1)

        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.option1.setText(QtGui.QApplication.translate("Dialog", "Option 1", None, QtGui.QApplication.UnicodeUTF8))
        self.option2.setText(QtGui.QApplication.translate("Dialog", "Option 2", None, QtGui.QApplication.UnicodeUTF8))
        self.Option3.setText(QtGui.QApplication.translate("Dialog", "Option 3", None, QtGui.QApplication.UnicodeUTF8))
        self.Option4.setText(QtGui.QApplication.translate("Dialog", "Option 4", None, QtGui.QApplication.UnicodeUTF8))
        self.Option5.setText(QtGui.QApplication.translate("Dialog", "Option 5", None, QtGui.QApplication.UnicodeUTF8))

from app import DragButton

Answer 1

释放按钮时使用按钮的坐标，对坐标进行一些数学运算或某种四舍五入，然后以编程方式将按钮移动/重新绘制到四舍五入的坐标。

您将必须绘制出想要的间距/尺寸的网格（可能在纸上最简单）。然后找出需要的公式，以便将x坐标更新为网格上最接近的垂直线，并将y坐标舍入为网格上最接近的水平线。