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Asked:2022-04-27 02:20:36 +0000 UTC2022-04-27 02:20:36 +0000 UTC

如何对 QGraphics PyQt5 中的点击形状做出反应？

  • 772

我有一个 PyQt5程序，它QGraphic在该字段上绘制一个 -field 和一个椭圆。属性分配给这个椭圆Selectable，当你用鼠标点击它时，它被选中，但我不知道如何处理这个选择。也就是说，当你点击这个椭圆时，会返回一个信号，或者说点击了某个椭圆。
请告诉我，这怎么办？

节目类型：

在此处输入图像描述

代码：（所有动作都发生在课堂上FormBuilder）

import sys
from PyQt5.QtWidgets import QWidget, QPushButton, QLabel, QHBoxLayout, QVBoxLayout, QLineEdit, QFormLayout, QGroupBox, \
    QRadioButton, QMainWindow, QWidget, QGridLayout, QApplication, QGraphicsScene, QGraphicsView, QGraphicsItem
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QBrush, QPen

WINDOW_HEIGHT = 150
WINDOW_WIDTH = 600
WINDOW_NAME = 'QGraphics Test'


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

        self.create_qgraphics()
        self.create_layers()

    def create_qgraphics(self): # создаем и настраиваем QGraph
        self.background_graph_scene = QGraphicsScene()
        self.brush = QBrush(Qt.green)
        self.pen = QPen(Qt.red)
        self.graphic_view = QGraphicsView(self.background_graph_scene)
        self.graphic_view.setGeometry(0, 0, 10, 10)

        # добавляем эллипс для примера и делаем его selectable
        ellipse = self.background_graph_scene.addEllipse(20, 20, 50, 50, self.pen, self.brush)
        ellipse.setFlag(QGraphicsItem.ItemIsSelectable)

    def create_layers(self): # подключаем QGraph к Grid
        main_layout = QVBoxLayout(self)

        background_image_layout = QHBoxLayout()
        background_image_layout.addWidget(self.graphic_view)
        main_layout.addLayout(background_image_layout)


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

        self.centralWidget = QWidget()
        self.setCentralWidget(self.centralWidget)

        self.build_skeleton_with_basic_settings()
        self.create_and_connect_grid()

    def build_skeleton_with_basic_settings(self):
        self.setFixedSize(WINDOW_WIDTH, WINDOW_HEIGHT)
        self.setWindowTitle(WINDOW_NAME)

    def create_and_connect_grid(self):
        self.main_grid = QGridLayout(self.centralWidget)
        form_builder_object = FormBuilder()
        self.main_grid.addWidget(form_builder_object, 0, 0, Qt.AlignTop)


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

1 个回答

  1. Best Answer

    可接舞台信号selectionChanged

    import sys
from PyQt5.QtWidgets import QWidget, QHBoxLayout, QVBoxLayout,  \
    QMainWindow, QWidget, QGridLayout, QApplication, QGraphicsScene, QGraphicsView, QGraphicsItem
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QBrush, QPen

WINDOW_HEIGHT = 150
WINDOW_WIDTH = 600
WINDOW_NAME = 'QGraphics Test'


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

        self.create_qgraphics()
        self.create_layers()

    def handleSelection(self):
        ss = self.background_graph_scene.selectedItems()
        if (len(ss) == 0):
            print('пусто')
        else:
            for s in ss:
                print(s.boundingRect())

    def create_qgraphics(self):  # создаем и настраиваем QGraph
        self.background_graph_scene = QGraphicsScene()
        self.background_graph_scene.selectionChanged.connect(
            self.handleSelection)
        self.brush = QBrush(Qt.green)
        self.pen = QPen(Qt.red)
        self.graphic_view = QGraphicsView(self.background_graph_scene)
        self.graphic_view.setGeometry(0, 0, 10, 10)

        # добавляем эллипс для примера и делаем его selectable
        ellipse = self.background_graph_scene.addEllipse(
            20, 20, 50, 50, self.pen, self.brush)
        ellipse.setFlag(QGraphicsItem.ItemIsSelectable)

        ellipse2 = self.background_graph_scene.addEllipse(
            120, 20, 50, 50, self.pen, self.brush)
        ellipse2.setFlag(QGraphicsItem.ItemIsSelectable)

    def create_layers(self):  # подключаем QGraph к Grid
        main_layout = QVBoxLayout(self)

        background_image_layout = QHBoxLayout()
        background_image_layout.addWidget(self.graphic_view)
        main_layout.addLayout(background_image_layout)


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

        self.centralWidget = QWidget()
        self.setCentralWidget(self.centralWidget)

        self.build_skeleton_with_basic_settings()
        self.create_and_connect_grid()

    def build_skeleton_with_basic_settings(self):
        self.setFixedSize(WINDOW_WIDTH, WINDOW_HEIGHT)
        self.setWindowTitle(WINDOW_NAME)

    def create_and_connect_grid(self):
        self.main_grid = QGridLayout(self.centralWidget)
        form_builder_object = FormBuilder()
        self.main_grid.addWidget(form_builder_object, 0, 0, Qt.AlignTop)


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

    或者，如果您想自己捕捉点击，则创建一个自定义QGraphicsItem并覆盖mousePressEvent方法

    • 1

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