qspliter、QWidget大小调整、setSizes（）、setStretchFactor（）和sizeHint（）如何使它们一起工作？

# QSplitter3.py import cv2 import numpy as np from PyQt5.QtWidgets import QApplication, QWidget, QHBoxLayout, QVBoxLayout, QLabel, QGridLayout, QSizePolicy, \ QFrame, QTabWidget, QTextEdit, QSplitter from PyQt5.QtGui import QImage, QPixmap, QPainter from PyQt5.Qt import Qt from PyQt5.Qt import QPoint def main(): app = QApplication([]) screenSize = app.primaryScreen().size() print('screenSize = ' + str(screenSize.width()) + ', ' + str(screenSize.height())) mainForm = MainForm(screenSize) mainForm.show() app.exec() # end function class MainForm(QWidget): def __init__(self, screenSize): super().__init__() # set the title and size of the Qt QWidget window self.setWindowTitle('Qt Window') self.setGeometry(screenSize.width() * 0.2, screenSize.height() * 0.2, screenSize.width() * 0.5 , screenSize.height() * 0.7) # declare a QTextEdit to show user messages at the top, set the font size, height, and read only property self.txtUserMessages = QTextEdit() self.setFontSize(self.txtUserMessages, 14) self.txtUserMessages.setReadOnly(True) # make the min height of the text box about 2 lines of text high self.txtUserMessages.setMinimumHeight(self.getTextEditHeightForNLines(self.txtUserMessages, 2)) # populate the user messages text box with some example text self.txtUserMessages.append('message 1') self.txtUserMessages.append('message 2') self.txtUserMessages.append('message 3') self.txtUserMessages.append('stuff here') self.txtUserMessages.append('bla bla bla') self.txtUserMessages.append('asdasdsadds') # instantiate the custom ImageWidget class below to show the image self.imageWidget = ImageWidget() self.imageWidget.setMargin(0) self.imageWidget.setContentsMargins(0, 0, 0, 0) self.imageWidget.setScaledContents(True) self.imageWidget.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Ignored) self.imageWidget.setAlignment(Qt.AlignCenter) # declare the splitter, then add the user message text box and tab widget self.splitter = QSplitter(Qt.Vertical) self.splitter.addWidget(self.txtUserMessages) self.splitter.addWidget(self.imageWidget) defaultTextEditHeight = self.getTextEditHeightForNLines(self.txtUserMessages, 3) print('defaultTextEditHeight = ' + str(defaultTextEditHeight)) # How can I use defaultTextEditHeight height here, but still allow resizing ?? # I really don't like this line, the 1000 is a guess and check that may only work with one screen size !!! self.splitter.setSizes([defaultTextEditHeight, 1000]) # Should setStretchFactor be used here ?? This does not seem to work # self.splitter.setStretchFactor(0, 0) # self.splitter.setStretchFactor(1, 1) # What about sizeHint() ?? Should that be used here, and if so, how ?? # set the main form's layout to the QGridLayout self.gridLayout = QGridLayout() self.gridLayout.addWidget(self.splitter) self.setLayout(self.gridLayout) # open the two images in OpenCV format self.openCvImage = cv2.imread('image.jpg') if self.openCvImage is None: print('error opening image') return # end if # convert the OpenCV image to QImage self.qtImage = openCvImageToQImage(self.openCvImage) # show the QImage on the ImageWidget self.imageWidget.setPixmap(QPixmap.fromImage(self.qtImage)) # end function def setFontSize(self, widget, fontSize): font = widget.font() font.setPointSize(fontSize) widget.setFont(font) # end function def getTextEditHeightForNLines(self, textEdit, numLines): fontMetrics = textEdit.fontMetrics() rowHeight = fontMetrics.lineSpacing() rowHeight = rowHeight * 1.21 textEditHeight = int(numLines * rowHeight) return textEditHeight # end function # end class def openCvImageToQImage(openCvImage): # get the height, width, and num channels of the OpenCV image, then compute the byte value height, width, numChannels = openCvImage.shape byteValue = numChannels * width # make the QImage from the OpenCV image qtImage = QImage(openCvImage.data, width, height, byteValue, QImage.Format_RGB888).rgbSwapped() return qtImage # end function class ImageWidget(QLabel): def __init__(self): super(QLabel, self).__init__() # end function def setPixmap(self, pixmap): self.pixmap = pixmap # end function def paintEvent(self, event): size = self.size() painter = QPainter(self) point = QPoint(0, 0) scaledPixmap = self.pixmap.scaled(size, Qt.KeepAspectRatio, transformMode=Qt.SmoothTransformation) point.setX((size.width() - scaledPixmap.width()) / 2) point.setY((size.height() - scaledPixmap.height()) / 2) painter.drawPixmap(point, scaledPixmap) # end function # end class if __name__ == '__main__': main()

# declare the splitter, then add the user message text box and tab widget self.splitter = QSplitter(Qt.Vertical) self.splitter.addWidget(self.txtUserMessages) self.splitter.addWidget(self.imageWidget) defaultTextEditHeight = self.getTextEditHeightForNLines(self.txtUserMessages, 3) print('defaultTextEditHeight = ' + str(defaultTextEditHeight)) # How can I use defaultTextEditHeight height here, but still allow resizing ?? # I really don't like this line, the 1000 is a guess and check that may only work with one screen size !!! self.splitter.setSizes([defaultTextEditHeight, 1000]) # Should setStretchFactor be used here ?? This does not seem to work # self.splitter.setStretchFactor(0, 0) # self.splitter.setStretchFactor(1, 1) # What about sizeHint() ?? Should that be used here, and if so, how ?? # set the main form's layout to the QGridLayout self.gridLayout = QGridLayout() self.gridLayout.addWidget(self.splitter)

1条回答

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1楼 · 发布于 2024-06-25 23:25:29

在我的解决方案中，我将不考虑opencv的部分，因为它增加了不必要的复杂性

解决方案是使用setStretchFactor()方法，在这种情况下，重写QTextEdit的sizeHint()方法来设置初始大小，并设置最小高度的setMinimumHeight（）。为了显示图像，我使用了QGraphicsView而不是QLabel，因为逻辑更简单

from PyQt5 import QtCore, QtGui, QtWidgets


class TextEdit(QtWidgets.QTextEdit):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setReadOnly(True)
        font = self.font()
        font.setPointSize(14)
        self.setFont(font)
        self.setMinimumHeight(self.heightForLines(2))

    def heightForLines(self, n):
        return (
            n * self.fontMetrics().lineSpacing() + 2 * self.document().documentMargin()
        )

    def showEvent(self, event):
        self.verticalScrollBar().setValue(self.verticalScrollBar().minimum())

    def sizeHint(self):
        s = super().sizeHint()
        s.setHeight(self.heightForLines(3))
        return s


class GraphicsView(QtWidgets.QGraphicsView):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setFrameShape(QtWidgets.QFrame.NoFrame)
        self.setBackgroundBrush(self.palette().brush(QtGui.QPalette.Window))
        scene = QtWidgets.QGraphicsScene(self)
        self.setScene(scene)

        self._pixmap_item = QtWidgets.QGraphicsPixmapItem()
        scene.addItem(self._pixmap_item)

    def setPixmap(self, pixmap):
        self._pixmap_item.setPixmap(pixmap)

    def resizeEvent(self, event):
        self.fitInView(self._pixmap_item, QtCore.Qt.KeepAspectRatio)
        self.centerOn(self._pixmap_item)
        super().resizeEvent(event)


class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.textedit = TextEdit()
        for i in range(10):
            self.textedit.append("Message {}".format(i))

        self.graphicsview = GraphicsView()
        self.graphicsview.setPixmap(QtGui.QPixmap("image.jpg"))

        splitter = QtWidgets.QSplitter(QtCore.Qt.Vertical)

        splitter.addWidget(self.textedit)
        splitter.addWidget(self.graphicsview)

        splitter.setStretchFactor(1, 1)

        lay = QtWidgets.QGridLayout(self)
        lay.addWidget(splitter)

        screenSize = QtWidgets.QApplication.primaryScreen().size()
        self.setGeometry(
            screenSize.width() * 0.2,
            screenSize.height() * 0.2,
            screenSize.width() * 0.5,
            screenSize.height() * 0.7,
        )


def main():
    app = QtWidgets.QApplication([])
    w = Widget()
    w.resize(640, 480)
    w.show()
    app.exec_()


if __name__ == "__main__":
    main()

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