PyQt5 可拖动无框窗口答案

【问题标题】：PyQt5 draggable frameless windowPyQt5 可拖动无框窗口
【发布时间】：2016-10-09 15:44:46
【问题描述】：

我找到了一个在无框窗口上设置边框的示例，但它不可拖动。如何使无框窗口可拖动？特别是如果我能看到一个例子，那就太棒了。这是我的示例代码（通常代码较长，这就是为什么有很多库只是不介意它们）；

from PyQt5.QtWidgets import (QMessageBox,QApplication, QWidget, QToolTip, QPushButton,
                             QDesktopWidget, QMainWindow, QAction, qApp, QToolBar, QVBoxLayout,
                             QComboBox,QLabel,QLineEdit,QGridLayout,QMenuBar,QMenu,QStatusBar,
                             QTextEdit,QDialog,QFrame,QProgressBar
                             )
from PyQt5 import QtCore, QtWidgets, QtGui
from PyQt5.QtGui import QIcon,QFont,QPixmap,QPalette
from PyQt5.QtCore import QCoreApplication, Qt,QBasicTimer

import sys

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


        self.mwidget = QMainWindow(self)
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)


        #size
        self.setFixedSize(320, 450)
        self.center


        #label
        self.lbl = QLabel(self)
        self.lbl.setText("test")
        self.lbl.setStyleSheet("background-color: rgb(0,0,0);"
                               "border: 1px solid red;"
                               "color: rgb(255,255,255);"
                               "font: bold italic 20pt 'Times New Roman';")
        self.lbl.setGeometry(5,5,60,40)

        self.show()

    #center
    def center(self):
        qr = self.frameGeometry()
        cp = QDesktopWidget().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())

app = QApplication(sys.argv)
app.setStyleSheet("QMainWindow{background-color: darkgray;border: 1px solid black}")

ex = cssden()
sys.exit(app.exec_())

【问题讨论】：

标签： python windows python-3.4 pyqt5 qmainwindow

【解决方案1】：

您需要自己处理鼠标事件。

我们需要在mousePressEvent 上添加一个事件，这将保留我们上次单击窗口的位置
然后，我们将添加一个mouseMoveEvent，它将计算上一次点击的点与当前鼠标位置之间的距离。我们将根据这个距离移动窗口。

这是固定代码：

import sys
from PyQt5.QtCore import Qt, QPoint
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel


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

        # <MainWindow Properties>
        self.setFixedSize(320, 450)
        self.setStyleSheet("QMainWindow{background-color: darkgray;border: 1px solid black}")
        self.setWindowFlags(Qt.FramelessWindowHint)
        self.center()
        # </MainWindow Properties>

        # <Label Properties>
        self.lbl = QLabel(self)
        self.lbl.setText("test")
        self.lbl.setStyleSheet("QLabel{background-color: rgb(0,0,0); border: 1px solid red; color: rgb(255,255,255); font: bold italic 20pt 'Times New Roman';}")
        self.lbl.setGeometry(5, 5, 60, 40)
        # </Label Properties>

        self.oldPos = self.pos()
        self.show()

    def center(self):
        qr = self.frameGeometry()
        cp = QDesktopWidget().availableGeometry().center()
        qr.moveCenter(cp)
        self.move(qr.topLeft())

    def mousePressEvent(self, event):
        self.oldPos = event.globalPos()

    def mouseMoveEvent(self, event):
        delta = QPoint (event.globalPos() - self.oldPos)
        self.move(self.x() + delta.x(), self.y() + delta.y())
        self.oldPos = event.globalPos()


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

【讨论】：

效果很好。请问有没有关于鼠标悬停等鼠标事件的例子？只有关于 C++ 的示例，我很难将它们转换为 Python。
是的，我知道有很多 Python 示例。我认为最好的方法是了解如何将 Qt C++ 代码转换为 Python。它并不像一开始看起来那么复杂。
这是一个相关的code example
当它完美运行时，我感到非常惊讶。我认为需要对鼠标是否被按下进行某种检查。这让我有点难过，但对于其他想知道的人，我最终在文档中发现：If mouse tracking is switched off (default), mouse move events only occur if a mouse button is pressed while the mouse is being moved. If mouse tracking is switched on, mouse move events occur even if no mouse button is pressed. 所以默认情况下它完成了一半的工作。如果您需要鼠标跟踪，那么您必须稍微更改事件处理程序。

【解决方案2】：

这里是可拖动和调整大小的无框窗口

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *


class movable_label(QLabel):
    def __init__(self, parent):
        super().__init__(parent)

        self.parent = parent

        self.setStyleSheet("background-color: #ccc")
        self.setMinimumHeight(30)

    def mousePressEvent(self, e):
        if e.button() == Qt.LeftButton:
            if self.parent.press_control == 0:
                self.pos = e.pos()
                self.main_pos = self.parent.pos()
        super().mousePressEvent(e)
    def mouseMoveEvent(self, e):
        if self.parent.cursor().shape() == Qt.ArrowCursor:
            self.last_pos = e.pos() - self.pos
            self.main_pos += self.last_pos
            self.parent.move(self.main_pos)
        super(movable_label, self).mouseMoveEvent(e)


class main(QMainWindow):
    def __init__(self):
        super().__init__()
        
        self.setWindowFlags(Qt.FramelessWindowHint)
        self.central = QWidget()

        self.vbox = QVBoxLayout(self.central)
        self.vbox.addWidget(movable_label(self))
        self.vbox.addWidget(QPushButton("Click"))
        self.vbox.setAlignment(Qt.AlignTop)
        self.vbox.setSpacing(0)
        self.vbox.setContentsMargins(0,0,0,0)
        
        self.press_control = 0        
        
        self.setCentralWidget(self.central)
        self.resize(800,500)
        self.show()          

    def eventFilter(self, obj, e):
        #hovermoveevent
        if e.type() == 129:
            if self.press_control == 0:
                self.pos_control(e)#cursor position control for cursor shape setup

        #mousepressevent
        if e.type() == 2:
            self.press_control = 1
            self.origin = self.mapToGlobal(e.pos())
            self.ori_geo = self.geometry()

        #mousereleaseevent
        if e.type() == 3:

            self.press_control = 0
            self.pos_control(e)
        
        #mosuemoveevent
        if e.type() == 5:
            if self.cursor().shape() != Qt.ArrowCursor:
                self.resizing(self.origin, e, self.ori_geo, self.value)

        return True

    def pos_control(self, e):
        rect = self.rect()
        top_left = rect.topLeft()
        top_right = rect.topRight()
        bottom_left = rect.bottomLeft()
        bottom_right = rect.bottomRight()
        pos = e.pos()

        #top catch
        if pos in QRect(QPoint(top_left.x()+5,top_left.y()), QPoint(top_right.x()-5,top_right.y()+5)):
            self.setCursor(Qt.SizeVerCursor)
            self.value = 1

        #bottom catch
        elif pos in QRect(QPoint(bottom_left.x()+5,bottom_left.y()), QPoint(bottom_right.x()-5,bottom_right.y()-5)):
            self.setCursor(Qt.SizeVerCursor)
            self.value = 2
        
        #right catch
        elif pos in QRect(QPoint(top_right.x()-5,top_right.y()+5), QPoint(bottom_right.x(),bottom_right.y()-5)):
            self.setCursor(Qt.SizeHorCursor)
            self.value = 3

        #left catch
        elif pos in QRect(QPoint(top_left.x()+5,top_left.y()+5), QPoint(bottom_left.x(),bottom_left.y()-5)):
            self.setCursor(Qt.SizeHorCursor)
            self.value = 4

        #top_right catch
        elif pos in QRect(QPoint(top_right.x(),top_right.y()), QPoint(top_right.x()-5,top_right.y()+5)):
            self.setCursor(Qt.SizeBDiagCursor)
            self.value = 5

        #botom_left catch
        elif pos in QRect(QPoint(bottom_left.x(),bottom_left.y()), QPoint(bottom_left.x()+5,bottom_left.y()-5)):
            self.setCursor(Qt.SizeBDiagCursor)
            self.value = 6

        #top_left catch
        elif pos in QRect(QPoint(top_left.x(),top_left.y()), QPoint(top_left.x()+5,top_left.y()+5)):
            self.setCursor(Qt.SizeFDiagCursor)
            self.value = 7

        #bottom_right catch
        elif pos in QRect(QPoint(bottom_right.x(),bottom_right.y()), QPoint(bottom_right.x()-5,bottom_right.y()-5)):
            self.setCursor(Qt.SizeFDiagCursor)
            self.value = 8
        
        #default
        else:
            self.setCursor(Qt.ArrowCursor)       

    def resizing(self, ori, e, geo, value):    
        #top_resize
        if self.value == 1:
            last = self.mapToGlobal(e.pos())-ori
            first = geo.height()
            first -= last.y()
            Y = geo.y()
            Y += last.y()

            if first > self.minimumHeight():
                self.setGeometry(geo.x(), Y, geo.width(), first)                    
        
        #bottom_resize
        if self.value == 2:
            last = self.mapToGlobal(e.pos())-ori
            first = geo.height()
            first += last.y()
            self.resize(geo.width(), first)

        #right_resize
        if self.value == 3:
            last = self.mapToGlobal(e.pos())-ori
            first = geo.width()
            first += last.x()
            self.resize(first, geo.height())

        #left_resize
        if self.value == 4:
            last = self.mapToGlobal(e.pos())-ori
            first = geo.width()
            first -= last.x()
            X = geo.x()
            X += last.x()

            if first > self.minimumWidth():
                self.setGeometry(X, geo.y(), first, geo.height())

        #top_right_resize
        if self.value == 5:
            last = self.mapToGlobal(e.pos())-ori
            first_width = geo.width()
            first_height = geo.height()
            first_Y = geo.y()
            first_width += last.x()
            first_height -= last.y()
            first_Y += last.y()
                
            if first_height > self.minimumHeight():
                self.setGeometry(geo.x(), first_Y, first_width, first_height)

        #bottom_right_resize
        if self.value == 6:
            last = self.mapToGlobal(e.pos())-ori
            first_width = geo.width()
            first_height = geo.height()
            first_X = geo.x()
            first_width -= last.x()
            first_height += last.y()
            first_X += last.x()
                
            if first_width > self.minimumWidth():
                self.setGeometry(first_X, geo.y(), first_width, first_height)

        #top_left_resize
        if self.value == 7:
            last = self.mapToGlobal(e.pos())-ori
            first_width = geo.width()
            first_height = geo.height()
            first_X = geo.x()
            first_Y = geo.y()
            first_width -= last.x()
            first_height -= last.y()
            first_X += last.x()
            first_Y += last.y()
                
            if first_height > self.minimumHeight() and first_width > self.minimumWidth():
                self.setGeometry(first_X, first_Y, first_width, first_height)

        #bottom_right_resize
        if self.value == 8:
            last = self.mapToGlobal(e.pos())-ori
            first_width = geo.width()
            first_height = geo.height()
            first_width += last.x()
            first_height += last.y()                    
            
            self.setGeometry(geo.x(), geo.y(), first_width, first_height)           



app = QApplication([])
window = main()
window.installEventFilter(window)
app.exec()

【讨论】：

【解决方案3】：

添加到 Elad Joseph 的回答中，PyQt6 需要更新以下事件：

def mousePressEvent(self, event):
    self.oldPos = event.globalPosition().toPoint()

def mouseMoveEvent(self, event):
    delta = QPoint (event.globalPosition().toPoint() - self.oldPos)
    self.move(self.x() + delta.x(), self.y() + delta.y())
    self.oldPos = event.globalPosition().toPoint()

【讨论】：