[英]PySide2 - How can I show the “count of unread” on label?
感謝@LoïcG.,根據您提供的關鍵字,然后在下面編寫一些代碼,
可能效果很好。 但是在重畫之前如何擦除?
from PySide2 import QtCore,QtWidgets,QtGui
from PySide2.QtCore import QPoint
from PySide2.QtGui import QPainter,QPixmap,QImage
from PySide2.QtWidgets import QApplication,QLabel
import sys
if __name__ == "__main__":
app = QApplication(sys.argv)
image = QImage('Start.png')
painter = QPainter()
painter.begin(image)
painter.setBrush(QtCore.Qt.yellow)
center = QPoint(33,35)
painter.drawEllipse(center,10,10)
painter.drawText(30,40,'1')
painter.end()
label = QLabel()
label.setPixmap(QPixmap.fromImage(image))
label.show()
sys.exit(app.exec_())
如評論中所述,您必須使用QPixmap創建圖像,然后使用QPainter繪制藍色圓圈和文本,並將最終圖像設置為按鈕圖標。
在下面,您將找到一個帶有2個按鈕的工作示例,以增加/減少“未讀”值。
每次更改此值時, unreadCountChanged()
發出unreadCountChanged()
信號。
該圖像在unreadCountChanged
插槽上創建,並設置為按鈕圖標。
from PyQt4 import QtCore, QtGui
import sys
class MyApplication(QtGui.QMainWindow):
def __init__(self):
super(MyApplication, self).__init__()
self.unreadCount = 0
self.setupUi()
self.connect(self, QtCore.SIGNAL("unreadCountChanged()"), self.unreadCountChanged)
def setupUi(self):
self.pixmapBtn = QtGui.QPushButton(self)
self.pixmapBtn.setGeometry(QtCore.QRect(0, 0, 41, 41))
icon = QtGui.QIcon()
icon.addPixmap(QtGui.QPixmap("play.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
self.pixmapBtn.setIconSize(QtCore.QSize(32, 32))
self.pixmapBtn.setIcon(icon)
upBtn = QtGui.QPushButton("+", self)
upBtn.setGeometry(QtCore.QRect(60, 0, 41, 41))
self.connect(upBtn, QtCore.SIGNAL("clicked()"), self.onUpClicked)
downBtn = QtGui.QPushButton("-", self)
downBtn.setGeometry(QtCore.QRect(60, 50, 41, 41))
self.connect(downBtn, QtCore.SIGNAL("clicked()"), self.onDownClicked)
self.unreadLabel = QtGui.QLabel(self)
self.unreadLabel.setText("Count: {}".format(self.unreadCount))
self.unreadLabel.setGeometry(QtCore.QRect(5, 60, 51, 16))
self.resize(200, 200)
def onUpClicked(self):
self.unreadCount += 1
self.emit(QtCore.SIGNAL("unreadCountChanged()"))
def onDownClicked(self):
if self.unreadCount > 0:
self.unreadCount -= 1
self.emit(QtCore.SIGNAL("unreadCountChanged()"))
def unreadCountChanged(self):
self.unreadLabel.setText("Count: {}".format(self.unreadCount))
pixmap = QtGui.QPixmap("play.png")
if self.unreadCount > 0:
painter = QtGui.QPainter()
painter.begin(pixmap)
painter.setBrush(QtCore.Qt.blue) # Set the circle color
center = QtCore.QPoint(90, 90)
painter.drawEllipse(center, 40, 40)
font = painter.font()
font.setPointSize(30)
pen = painter.pen()
pen.setColor(QtCore.Qt.white) # Set the text color
painter.setPen(pen)
painter.setFont(font)
painter.drawText(80, 100, str(self.unreadCount))
painter.end()
icon = QtGui.QIcon()
icon.addPixmap(pixmap, QtGui.QIcon.Normal, QtGui.QIcon.Off)
self.pixmapBtn.setIcon(icon)
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
w = MyApplication()
w.show()
sys.exit(app.exec_())
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