Question

我正在尝试使用PyQt5制作GUI。它将带有一个带有图标的通知按钮。我想在图标上添加一个带有通知数量的小气泡。

如果无法输入数字，我想使用红点作为备用方法。但是我应该如何跟踪新的通知（例如通知的侦听器）并在窗口运行时更改图标？

我一直在搜索这个问题，但是只有移动开发方面的东西和与PyQt5无关的结果出现了。

预期结果：假设我们有一个列表。当新项目添加到列表时，按钮的图标将自动更改。然后，当单击按钮时，图标将变回原来的状态。

Answer 1

一种可能的解决方案是创建一个小部件，其布局应在其中放置QToolButton，在右上角是带有QPixmap且编号为QPel的QLabel

from PyQt5 import QtCore, QtGui, QtWidgets


def create_pixmap(point, radius=64):
    rect = QtCore.QRect(QtCore.QPoint(), 2 * radius * QtCore.QSize(1, 1))
    pixmap = QtGui.QPixmap(rect.size())
    rect.adjust(1, 1, -1, -1)
    pixmap.fill(QtCore.Qt.transparent)
    painter = QtGui.QPainter(pixmap)
    painter.setRenderHints(
        QtGui.QPainter.Antialiasing | QtGui.QPainter.TextAntialiasing
    )
    pen = painter.pen()
    painter.setPen(QtCore.Qt.NoPen)

    gradient = QtGui.QLinearGradient()
    gradient.setColorAt(1, QtGui.QColor("#FD6684"))
    gradient.setColorAt(0, QtGui.QColor("#E0253F"))
    gradient.setStart(0, rect.height())
    gradient.setFinalStop(0, 0)

    painter.setBrush(QtGui.QBrush(gradient))
    painter.drawEllipse(rect)
    painter.setPen(pen)
    painter.drawText(rect, QtCore.Qt.AlignCenter, str(point))
    painter.end()
    return pixmap


class NotificationButton(QtWidgets.QWidget):
    scoreChanged = QtCore.pyqtSignal(int)

    def __init__(self, score=0, icon=QtGui.QIcon(), radius=12, parent=None):
        super(NotificationButton, self).__init__(parent)

        self.m_score = score
        self.m_radius = radius

        self.setContentsMargins(0, self.m_radius, self.m_radius, 0)
        self.m_button = QtWidgets.QToolButton(clicked=self.clear)
        self.m_button.setContentsMargins(0, 0, 0, 0)
        self.m_button.setIcon(icon)
        self.m_button.setIconSize(QtCore.QSize(18, 18))
        lay = QtWidgets.QVBoxLayout(self)
        lay.setContentsMargins(0, 0, 0, 0)
        lay.addWidget(self.m_button)
        self.m_label = QtWidgets.QLabel(self)
        self.m_label.setAttribute(QtCore.Qt.WA_TransparentForMouseEvents)
        self.m_label.raise_()
        self.setSizePolicy(self.m_button.sizePolicy())
        self.update_notification()

    @QtCore.pyqtProperty(int, notify=scoreChanged)
    def score(self):
        return self.m_score

    @score.setter
    def score(self, score):
        if self.m_score != score:
            self.m_score = score
            self.update_notification()
            self.scoreChanged.emit(score)

    @QtCore.pyqtSlot()
    def clear(self):
        self.score = 0

    @QtCore.pyqtProperty(int)
    def radius(self):
        return self.m_radius

    @radius.setter
    def radius(self, radius):
        self.m_radius = radius
        self.update_notification()

    def update_notification(self):
        self.setContentsMargins(0, self.m_radius, self.m_radius, 0)
        self.m_label.setPixmap(create_pixmap(self.m_score, self.m_radius))
        self.m_label.adjustSize()

    def resizeEvent(self, event):
        self.m_label.move(self.width() - self.m_label.width(), 0)
        super(NotificationButton, self).resizeEvent(event)


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

        self.m_item_le = QtWidgets.QLineEdit("Stack Overflow")
        add_button = QtWidgets.QPushButton("Add", clicked=self.add_item)
        self.m_notification_button = NotificationButton(
            icon=QtGui.QIcon("image.png")
        )
        self.m_list_widget = QtWidgets.QListWidget()

        vlay = QtWidgets.QVBoxLayout(self)
        hlay = QtWidgets.QHBoxLayout()
        hlay.addWidget(self.m_item_le)
        hlay.addWidget(add_button)
        vlay.addLayout(hlay)
        vlay.addWidget(
            self.m_notification_button, alignment=QtCore.Qt.AlignRight
        )
        vlay.addWidget(self.m_list_widget)

    @QtCore.pyqtSlot()
    def add_item(self):
        text = self.m_item_le.text()
        self.m_list_widget.addItem(
            "%s: %s" % (self.m_list_widget.count(), text)
        )
        self.m_notification_button.score += 1
        self.m_list_widget.scrollToBottom()


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

Answer 2

如果您到目前为止显示代码，那将是很好的。无论如何，这些可以帮助您解决问题：

您将需要两个不同的图标：一个代表一个肮脏的（刚刚加载的）列表，另一个代表“干净的”列表

class YourClass(Dialog):
    def __init__(self)
        super().__init__()
        self.lst = []
        # ...       

    def setUI(self):
        # ...
        self.notButton = QPushButton(icon_off, '0')
        self.notButton.clicked.connect(self.clearButton)
        # ...

    @pyqtSlot()
    def clearButton(self):
        self.notButton.setIcon(icon_clean) 

    def addToList(self, item):
        self.lst.append(item)
        self.notButton.setIcon(icon_dirty)
        self.notButton.setText(str(len(self.lst)

Answer 3

更新图标的可能解决方案是为每个图标及其关联的通知号使用单独的图像文件。您可以在计数器变量中跟踪当前通知的数量。使用该号码呼叫相应的图标。

如何在按钮图标上添加通知号？

3 个答案: