对于 PyQT5 中的组合框,我们可以使用 QComboBox 控件来实现。当鼠标悬停时,我们可以添加边框来表示该组合框处于不可编辑状态。下面是详细的步骤和代码示例。
步骤
1.导入必要的库
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QComboBox, QStyle, QStyleOptionComboBox, QProxyStyle
2.创建一个自定义的样式类
class CustomComboBoxStyle(QProxyStyle):
def subControlRect(self, control, option, subControl, widget=None):
r = QProxyStyle.subControlRect(self, control, option, subControl, widget)
if subControl == QStyle.SC_ComboBoxArrow and control == QStyle.CC_ComboBox and widget:
if widget.property('hovered') or not widget.isEditable():
r.setWidth(widget.width() - r.x() - self.pixelMetric(QStyle.PM_ScrollBarExtent))
return r
def drawComplexControl(self, control, option, painter, widget=None):
if control == QStyle.CC_ComboBox and widget:
if widget.property('hovered') or not widget.isEditable():
option.state |= QStyle.State_On
super().drawComplexControl(control, option, painter, widget)
3.在组合框的构造函数中使用自定义样式
class MyComboBox(QComboBox):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.setStyle(CustomComboBoxStyle())
示例
import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QVBoxLayout, QWidget, QComboBox
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPalette
class CustomComboBoxStyle(QProxyStyle):
def subControlRect(self, control, option, subControl, widget=None):
r = QProxyStyle.subControlRect(self, control, option, subControl, widget)
if subControl == QStyle.SC_ComboBoxArrow and control == QStyle.CC_ComboBox and widget:
if widget.property('hovered') or not widget.isEditable():
r.setWidth(widget.width() - r.x() - self.pixelMetric(QStyle.PM_ScrollBarExtent))
return r
def drawComplexControl(self, control, option, painter, widget=None):
if control == QStyle.CC_ComboBox and widget:
if widget.property('hovered') or not widget.isEditable():
option.state |= QStyle.State_On
super().drawComplexControl(control, option, painter, widget)
class MyComboBox(QComboBox):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.setStyleSheet("""
QComboBox {
height: 30px;
width: 100px;
font-size: 16px;
}
""")
self.setStyle(CustomComboBoxStyle())
class MainWindow(QMainWindow):
def __init__(self):
super().__init__()
centralWidget = QWidget()
self.setCentralWidget(centralWidget)
layout = QVBoxLayout()
centralWidget.setLayout(layout)
comboBox1 = MyComboBox()
comboBox2 = MyComboBox()
comboBox2.setEditable(True)
layout.addWidget(comboBox1)
layout.addWidget(comboBox2)
if __name__ == '__main__':
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
上述示例中,我们创建了一个主窗口和两个自定义的组合框。其中,第一个组合框不可编辑,第二个组合框可编辑。在自定义的组合框 MyComboBox 的构造函数中,我们通过 self.setStyle(CustomComboBoxStyle())
使用了自定义的样式类 CustomComboBoxStyle。在样式类 CustomComboBoxStyle 中,我们通过重写 subControlRect
和 drawComplexControl
方法,实现了在组合框不可编辑或鼠标悬停时添加边框的效果。
注意,在自定义的组合框构造函数中,我们通过 self.setStyleSheet()
来设置组合框的样式,这里我们设置了组合框的高度、宽度和字体大小。如果你想使组合框具有更多的样式,可以考虑在样式表中添加更多的属性。