PyQt5 抓取并保存屏幕部分

Question

所以我的想法是我应该能够启动脚本，select 屏幕的一部分，然后按回车键（或以其他方式触发它）以保存 selection。

我从其他帖子和东西中得到了很多代码，但现在我被卡住了。我可以 select 屏幕的任何部分并根据需要调整大小，但我似乎无法让它识别 "enter" 键。现在 "keyPressEvent" 函数只是应该打印一条消息，所以我知道它有效，但我什么也没得到。有什么想法吗？

import sys
from PyQt5 import QtGui, QtCore, QtWidgets
from PyQt5.QtCore import Qt, QPoint, QRect, QSize
from PyQt5.QtGui import QScreen
from PyQt5.QtWidgets import QApplication, QLabel, QRubberBand


class MyLabel(QtWidgets.QLabel):

    def __init__(self, parent=None):
        QtWidgets.QLabel.__init__(self, parent)
        self.selection = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle, self)


    def keyPressEvent(self, qKeyEvent):
        print(qKeyEvent.key())
        if qKeyEvent.key() == QtCore.Qt.Key_Return: 
            print('Enter pressed')
        else:
            super().keyPressEvent(qKeyEvent)

    def mousePressEvent(self, event):
        '''
            Mouse is pressed. If selection is visible either set dragging mode (if close to border) or hide selection.
            If selection is not visible make it visible and start at this point.
        '''

        if event.button() == QtCore.Qt.LeftButton:

            position = QtCore.QPoint(event.pos())
            if self.selection.isVisible():
                # visible selection
                if (self.upper_left - position).manhattanLength() < 20:
                    # close to upper left corner, drag it
                    self.mode = "drag_upper_left"
                elif (self.lower_right - position).manhattanLength() < 20:
                    # close to lower right corner, drag it
                    self.mode = "drag_lower_right"
                else:
                    # clicked somewhere else, hide selection
                    self.selection.hide()
            else:
                # no visible selection, start new selection
                self.upper_left = position
                self.lower_right = position
                self.mode = "drag_lower_right"
                self.selection.show()

    def mouseMoveEvent(self, event):
        '''
            Mouse moved. If selection is visible, drag it according to drag mode.
        '''

        if self.selection.isVisible():
            # visible selection
            if self.mode is "drag_lower_right":
                self.lower_right = QtCore.QPoint(event.pos())
            elif self.mode is "drag_upper_left":
                self.upper_left = QtCore.QPoint(event.pos())
            # update geometry
            self.selection.setGeometry(QtCore.QRect(self.upper_left, self.lower_right).normalized())


class mainUI(QtWidgets.QWidget):

    def __init__(self):
        super(mainUI, self).__init__()
        self.initUI()

    def initUI(self):
        layout = QtWidgets.QVBoxLayout(self)

        label = MyLabel(self)
        pixmap = QScreen.grabWindow(app.primaryScreen(), app.desktop().winId())
        label.setPixmap(pixmap)
        layout.addWidget(label)

        self.setLayout(layout)

        geometry = app.desktop().availableGeometry()

        self.setFixedSize(geometry.width(), geometry.height())

        # self.setWindowFlags( self.windowFlags() | Qt.FramelessWindowHint)
        self.show()


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)

    window = mainUI()

    sys.exit(app.exec_())

编辑

好的，此代码有效，但老实说，我不是 100% 确定原因。

import sys
from PyQt5 import QtGui, QtCore, QtWidgets
from PyQt5.QtCore import Qt, QPoint, QRect, QSize
from PyQt5.QtGui import QScreen
from PyQt5.QtWidgets import QApplication, QLabel, QRubberBand, QAction

class KpeWindow(QtWidgets.QLabel):
    def __init__(self, parent=None):
        QtWidgets.QLabel.__init__(self,parent)
        main = QtWidgets.QVBoxLayout(self)
        self.selection = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle, self)

        # label = QLabel(self)
        # label.setText('Test the keyPressEvent')
        # main.addWidget(label)

        # self.adjustSize()
        # self.setLayout(main)

    def keyPressEvent(self, event):
        print(event.key())
        if event.key() == QtCore.Qt.Key_Return:
            print('yay')

        #QtWidgets.QMessageBox.warning(self, 'MDI', 'keyPressEvent')
        self.parent().keyPressEvent(event)


    def mousePressEvent(self, event):
        '''
            Mouse is pressed. If selection is visible either set dragging mode (if close to border) or hide selection.
            If selection is not visible make it visible and start at this point.
        '''
        print(event)
        if event.button() == QtCore.Qt.LeftButton:

            position = QtCore.QPoint(event.pos())
            if self.selection.isVisible():
                # visible selection
                if (self.upper_left - position).manhattanLength() < 20:
                    # close to upper left corner, drag it
                    self.mode = "drag_upper_left"
                elif (self.lower_right - position).manhattanLength() < 20:
                    # close to lower right corner, drag it
                    self.mode = "drag_lower_right"
                else:
                    # clicked somewhere else, hide selection
                    self.selection.hide()
            else:
                # no visible selection, start new selection
                self.upper_left = position
                self.lower_right = position
                self.mode = "drag_lower_right"
                self.selection.show()

    def mouseMoveEvent(self, event):
        '''
            Mouse moved. If selection is visible, drag it according to drag mode.
        '''

        if self.selection.isVisible():
            # visible selection
            if self.mode is "drag_lower_right":
                self.lower_right = QtCore.QPoint(event.pos())
            elif self.mode is "drag_upper_left":
                self.upper_left = QtCore.QPoint(event.pos())
            # update geometry
            self.selection.setGeometry(QtCore.QRect(self.upper_left, self.lower_right).normalized())

class MainWindow(QtWidgets.QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()
        QtWidgets.QMainWindow.__init__(self)
        #self.setWindowTitle('KeyPressEvent Test')
        # main = QtWidgets.QVBoxLayout(self)
        # child = KpeWindow(self)
        # child.setFocusPolicy(Qt.StrongFocus)
        # self.setFocusProxy(child)
        # main.addWidget(child)
        # child.setFocus(True)

        layout = QtWidgets.QVBoxLayout(self)

        label = KpeWindow(self)
        pixmap = QScreen.grabWindow(app.primaryScreen(), app.desktop().winId())
        label.setPixmap(pixmap)
        layout.addWidget(label)
        #new
        label.setFocusPolicy(Qt.StrongFocus)
        self.setFocusProxy(label)
        label.setFocus(True)

        self.setLayout(layout)

        geometry = app.desktop().availableGeometry()

        self.setFixedSize(geometry.width(), geometry.height())


        # self.setWindowFlags( self.windowFlags() | Qt.FramelessWindowHint)
        self.show()

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

Answer 1

您需要在标签上set the focus policy获取键盘事件：

class MyLabel(QtWidgets.QLabel):

    def __init__(self, parent=None):
        ...
        self.setFocusPolicy(Qt.TabFocus)

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