【发布时间】：2019-01-16 23:49:24
【问题描述】：
我想在某个标签中绘制一个矩形，我用 QtDesigner 制作了一个 GUI，它在一个名为“class Ui_MainWindow(QMainWindow):”的类中生成整个 GUI 代码，并且我在我的窗口中使用了三个选项卡。
我在标签上使用 QMouseEvent 时遇到问题，我找到了使用此代码的解决方案
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import Qt
import sys
import cv2
from PyQt5.QtWidgets import QMainWindow, QWidget, QLabel
from PyQt5.QtGui import QPixmap, QImage
class Ui_MainWindow(QMainWindow):
def __init__(self):
# super(Ui_MainWindow, self).__init__ ()
super().__init__()
self.count = 0
self.frame = 0
self.fileName="0"
self.imagesTab2 = []
self.k = 0
self.i = 1
self.w = 0
self.h = 0
self.coordPt = []
self.dictListClasses = {
"face" :[],
"car" : [] }
self.dictColorClasses = {
"face" :(0, 100, 255),
"car" : (0,255, 0) }
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(655, 364)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
self.verticalLayout.setObjectName("verticalLayout")
self.tabWidget = QtWidgets.QTabWidget(self.centralwidget)
self.tabWidget.setObjectName("tabWidget")
self.tab = QtWidgets.QWidget()
self.tab.setObjectName("tab")
self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.tab)
self.verticalLayout_2.setContentsMargins(0, 0, 0, 0)
self.verticalLayout_2.setObjectName("verticalLayout_2")
self.horizontalLayout = QtWidgets.QHBoxLayout()
self.horizontalLayout.setObjectName("horizontalLayout")
self.pushButton = QtWidgets.QPushButton(self.tab)
self.pushButton.setObjectName("pushButton")
self.horizontalLayout.addWidget(self.pushButton)
self.verticalLayout_2.addLayout(self.horizontalLayout)
self.label = QtWidgets.QLabel(self.tab)
self.label.setText("")
self.label.setObjectName("label")
self.label.setFrameShape(QtWidgets.QFrame.StyledPanel)
self.label.setFrameShadow(QtWidgets.QFrame.Sunken)
self.setMouseEventDelegate(self.label)
self.verticalLayout_2.addWidget(self.label)
self.verticalLayout_2.setStretch(1, 1)
self.tabWidget.addTab(self.tab, "")
self.tab_2 = QtWidgets.QWidget()
self.tab_2.setObjectName("tab_2")
self.tabWidget.addTab(self.tab_2, "")
self.verticalLayout.addWidget(self.tabWidget)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 655, 21))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
self.tabWidget.setCurrentIndex(0)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.pushButton.setText(_translate("MainWindow", "Open"))
self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab), _translate("MainWindow", "Tab 1"))
self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_2), _translate("MainWindow", "Tab 2"))
self.pushButton.clicked.connect(self.openFileTab2)
def setMouseEventDelegate (self, setQWidget):
def subWidgetMousePressEvent(e: QtGui.QMouseEvent):
if self.imagesTab2:
if e.button() == Qt.LeftButton:
po = int(e.x()*self.w/self.label.width())
pa = int(e.y()*self.h/self.label.height())
self.coordPt = [(po, pa)]
print("coords click = ", self.coordPt)
self.begin = e.pos()
self.end = e.pos()
self.label.update()
print("begin 1= ",self.begin, self.end)
def subWidgetMouseMoveEvent(e: QtGui.QMouseEvent):
if self.imagesTab2:
self.end = e.pos()
self.label.update()
def subWidgetMouseReleaseEvent(e: QtGui.QMouseEvent):
if e.button() == Qt.LeftButton:
if self.imagesTab2:
if e.x() >= 0 and e.y() >= 0 and e.x()<self.label.width() and e.y()<self.label.height():
po = int(e.x()*self.w/self.label.width())
pa = int(e.y()*self.h/self.label.height())
self.coordPt.append((po, pa))
print("coords release = ", self.coordPt)
self.begin = e.pos()
self.end = e.pos()
self.label.update()
print("begin 2= ",self.begin, self.end)
self.dictListClasses["car"].append(self.coordPt)
print("LL + ", self.dictListClasses)
setQWidget.mousePressEvent = subWidgetMousePressEvent
setQWidget.mouseReleaseEvent = subWidgetMouseReleaseEvent
setQWidget.mouseMoveEvent = subWidgetMouseMoveEvent
def openFileTab2(self):
self.imagesTab2, _ = QtWidgets.QFileDialog.getOpenFileNames(None,"Select one or more images to open", "/Images","Images (*.jpg *.jpeg .*bmp .*png);;All Files (*)")
if self.imagesTab2:
self.showImageInLabel(self.imagesTab2[0])
# self.label_9.setText("Image 1")
def showImageInLabel(self, img):
pix = QPixmap(img)
self.w = pix.width()
self.h = pix.height()
print("Image resolution = ", '(',self.w,')', '(',self.h,')')
pix = pix.scaled(self.size(), aspectRatioMode=QtCore.Qt.KeepAspectRatio, ) # To scale image for example and keep its Aspect Ration
self.label.setPixmap(pix)
self.label.setScaledContents(True)
def nextImageTab2(self):
if not self.imagesTab2:
print("No files, please open one or more images")
return
if self.i < len(self.imagesTab2):
path = self.imagesTab2[self.i]
self.showImageInLabel(path)
self.i += 1
print(self.i)
x = "Image " + str(self.i)
# self.label_9.setText(x)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
上面的代码是重写三个函数：
mousePressEvent、mouseReleaseEvent 和 mouseMoveEvent
因为如果我只使用 def mouseMoveEvent (self, event): 例如，它在我的标签上不起作用我不知道如何将它设置为在某个标签上工作
所以我试图覆盖 QPaintEvent 函数，但如果我使用上面的代码并使用这个setQWidget.paintEvent = subWidgetPaintEvent，标签就会消失，我只找到一个矩形
谁能帮助我使用我的标签上的事件，就像这段代码一样，谢谢
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import QPainter, QColor, QBrush
from PyQt5 import QtWidgets, QtCore, QtGui
class Labella(QLabel):
def __init__(self, parent):
super().__init__(parent=parent)
self.setStyleSheet('QFrame {background-color:white;}')
self.resize(300, 300)
self.begin = QtCore.QPoint()
self.end = QtCore.QPoint()
def paintEvent(self, event):
qp = QtGui.QPainter(self)
br = QtGui.QBrush(QtGui.QColor(100, 10, 10, 40))
qp.setBrush(br)
qp.drawRect(QtCore.QRect(self.begin, self.end))
def mousePressEvent(self, event):
self.begin = event.pos()
self.end = event.pos()
self.update()
print("beegin = ", self.begin)
print("end 1 = ", self.end)
def mouseMoveEvent(self, event):
self.end = event.pos()
self.update()
def mouseReleaseEvent(self, event):
self.begin = event.pos()
self.end = event.pos()
self.update()
def drawRectangles(self, qp):
qp.setBrush(QColor(255, 0, 0, 100))
qp.save() # save the QPainter config
qp.drawRect(10, 15, 20, 20)
qp.setBrush(QColor(0, 0, 255, 100))
qp.drawRect(50, 15, 20, 20)
qp.restore() # restore the QPainter config
qp.drawRect(100, 15, 20, 20)
class Example(QWidget):
def __init__(self):
super().__init__()
lb = Labella(self)
self.setGeometry(300, 300, 350, 300)
self.setWindowTitle('Colours')
self.show()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
【问题讨论】：
-
是的，我希望它保留在最后一个代码中，但这不是主要问题，这只是我正在测试的示例代码。我的主要代码是另一个由 QtDesigner 生成的代码，它有一个像我上面提到的类，我想做与上一个代码相同的事情，但它在我的主代码中不起作用，有没有办法在 tabWidget 中有这个标签的同时绘制某个标签哪个在 QMainWindow 中？感谢您的重播
-
如果我的问题不够清楚，我可以添加一两张图片来解释更多
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这是我的原始代码...我在上面编辑过..我已经为第二个 tabWidget 剪掉了代码，所以它不会很长，我没有问题
-
是的，是的，我是通过电子邮件发送还是在此处共享代码？我认为评论不适合整个代码
-
这里是 pastebin 因为代码太长了pastebin.com/5dw6L0kZ
标签： python pyqt pyqt5 qt-designer qlabel