PyQt 按钮点击区域（非矩形区域）

Question

我正在为 Maya 开发 PySide 界面，我想知道是否可以为按钮定义一个非矩形可点击区域。

我尝试使用 QPushButton 并扩展 QLabel 对象以获取按钮行为，但您知道是否有可能获得包含带有 alpha 通道的图片的按钮并使用该 alpha 定义按钮的单击区域？

如果您能指导我解决这个问题，我将不胜感激。 提前致谢。

我试过了……

from PySide import QtCore
from PySide import QtGui 

class QLabelButton(QtGui.QLabel):

    def __init(self, parent):
        QtGui.QLabel.__init__(self, parent)

    def mousePressEvent(self, ev):
        self.emit(QtCore.SIGNAL('clicked()'))

class CustomButton(QtGui.QWidget):
    def __init__(self, parent=None, *args):
        super(CustomButton, self).__init__(parent)
        self.setMinimumSize(300, 350)
        self.setMaximumSize(300, 350)

        picture = __file__.replace('qbtn.py', '') + 'mario.png'
        self.button = QLabelButton(self)
        self.button.setPixmap(QtGui.QPixmap(picture))
        self.button.setScaledContents(True)

        self.connect(self.button, QtCore.SIGNAL('clicked()'), self.onClick)

    def onClick(self):
        print('Button was clicked')


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

mario.png

Answer 1

这是我解决上述问题的最终代码......

from PySide import QtCore 
from PySide import QtGui 


class QLabelButton(QtGui.QLabel):

    def __init(self, parent):
        QtGui.QLabel.__init__(self, parent)

    def mousePressEvent(self, ev):
        self.emit(QtCore.SIGNAL('clicked()'))

class CustomButton(QtGui.QWidget):
    def __init__(self, parent=None, *args):
        super(CustomButton, self).__init__(parent)
        self.setMinimumSize(300, 350)
        self.setMaximumSize(300, 350)

        pixmap = QtGui.QPixmap('D:\mario.png')

        self.button = QLabelButton(self)
        self.button.setPixmap(pixmap)
        self.button.setScaledContents(True)
        self.button.setMask(pixmap.mask()) # THIS DOES THE MAGIC

        self.connect(self.button, QtCore.SIGNAL('clicked()'), self.onClick)

    def onClick(self):
        print('Button was clicked')

Answer 2

您可以通过捕获按下/释放事件并使用图像中的像素值检查点击位置来决定小部件是否应该发出点击。

class CustomButton(QWidget):

    def __init__(self, parent, image):
        super(CustomButton, self).__init__(parent)
        self.image = image

    def sizeHint(self):
        return self.image.size()

    def mouseReleaseEvent(self, event):
        # Position of click within the button
        pos = event.pos()
        # Assuming button is the same exact size as image
        # get the pixel value of the click point.
        pixel = self.image.alphaChannel().pixel(pos)

        if pixel:
            # Good click, pass the event along, will trigger a clicked signal
            super(CustomButton, self).mouseReleaseEvent(event)
        else:
            # Bad click, ignore the event, no click signal
            event.ignore()