Qt4：对QIcon进行着色

Question

在Qt4/PyQt4中对QIcon应用色调的最简单方法是什么？我有几个单色QPixmaps，我想根据其关联对象的属性重新着色。

Answer 1

你可以画在你的像素图。只需选择适合您的目标的composition mode即可。

下面是一个简单的Tinter工具。 applyTint方法是有趣的部分。这使用Overlay组成。

import sys 
from PyQt4 import QtGui, QtCore 

class Tinter(QtGui.QWidget): 
    def __init__(self, image, parent=None): 
     super(Tinter, self).__init__(parent) 

     self.pixmap = QtGui.QPixmap(image) 

     self.normal = QtGui.QLabel() 
     self.normal.setPixmap(self.pixmap) 
     self.tinted = QtGui.QLabel() 

     self.red = QtGui.QSlider(QtCore.Qt.Horizontal) 
     self.red.setRange(0, 255) 
     self.red.sliderMoved.connect(self.applyTint) 
     self.green = QtGui.QSlider(QtCore.Qt.Horizontal) 
     self.green.setRange(0, 255) 
     self.green.sliderMoved.connect(self.applyTint) 
     self.blue = QtGui.QSlider(QtCore.Qt.Horizontal) 
     self.blue.setRange(0, 255) 
     self.blue.sliderMoved.connect(self.applyTint) 
     self.alpha = QtGui.QSlider(QtCore.Qt.Horizontal) 
     self.alpha.setRange(0, 255) 
     self.alpha.setValue(128) 
     self.alpha.sliderMoved.connect(self.applyTint) 


     controlLayout = QtGui.QFormLayout() 
     controlLayout.addRow('red', self.red) 
     controlLayout.addRow('green', self.green) 
     controlLayout.addRow('blue', self.blue) 
     controlLayout.addRow('alpha', self.alpha) 

     layout = QtGui.QHBoxLayout() 
     layout.addWidget(self.normal) 
     layout.addWidget(self.tinted) 
     layout.addLayout(controlLayout) 
     self.setLayout(layout) 

     self.applyTint() 

    def applyTint(self): 
     temp = QtGui.QPixmap(self.pixmap) 
     color = QtGui.QColor(self.red.value(), 
          self.green.value(), 
          self.blue.value(), 
          self.alpha.value()) 
     painter = QtGui.QPainter(temp) 
     painter.setCompositionMode(painter.CompositionMode_Overlay) 
     painter.fillRect(temp.rect(), color) 
     painter.end() 
     self.tinted.setPixmap(temp) 

app = QtGui.QApplication(sys.argv) 

main = Tinter('so.jpg') 
main.show() 

sys.exit(app.exec_()) 

Answer 2

如果图标可以显示在其自己的小部件中（例如QLabel），那么一个简单的解决方案是应用QGraphicsColorizeEffect。

这里有一个简单的演示：

from random import randint 
from PyQt4 import QtGui, QtCore 

class Window(QtGui.QWidget): 
    def __init__(self): 
     QtGui.QWidget.__init__(self) 
     self.label = QtGui.QLabel(self) 
     self.label.setPixmap(QtGui.QPixmap('image.jpg')) 
     self.button = QtGui.QPushButton('Tint', self) 
     self.button.clicked.connect(self.handleButton) 
     layout = QtGui.QVBoxLayout(self) 
     layout.addWidget(self.label) 
     layout.addWidget(self.button) 

    def handleButton(self): 
     if self.label.graphicsEffect() is None: 
      self.effect = QtGui.QGraphicsColorizeEffect(self) 
      self.effect.setStrength(0.6) 
      self.label.setGraphicsEffect(self.effect) 
     self.effect.setColor(QtGui.QColor(
      randint(0, 255), randint(0, 255), randint(0, 255))) 

if __name__ == '__main__': 

    import sys 
    app = QtGui.QApplication(sys.argv) 
    window = Window() 
    window.show() 
    sys.exit(app.exec_())