Python 在PyQT中实现QTreeWidgetItem的边框
我看不出有任何方法可以为特定的QTreeWidgetItem定义样式表,因此我决定尝试使用SetBackground或SetForeground来找出解决方案。我试图实现的效果是在treeview的单个widgetitem周围添加边框,但我不知道如何使用QBrush手动绘制一个边框,如果这就是如何进行的话。有什么想法吗?提前感谢。您不能单独使用Python 在PyQT中实现QTreeWidgetItem的边框,python,user-interface,pyqt,Python,User Interface,Pyqt,我看不出有任何方法可以为特定的QTreeWidgetItem定义样式表,因此我决定尝试使用SetBackground或SetForeground来找出解决方案。我试图实现的效果是在treeview的单个widgetitem周围添加边框,但我不知道如何使用QBrush手动绘制一个边框,如果这就是如何进行的话。有什么想法吗?提前感谢。您不能单独使用QTreeWidgetItem绘制边框,您必须使用代理。 并且,您可以在每个项目中存储边框样式,您希望在自定义“角色”下为其创建边框,以便能够检索并在代理
QTreeWidgetItem
绘制边框,您必须使用代理。
并且,您可以在每个项目中存储边框样式,您希望在自定义“角色”下为其创建边框,以便能够检索并在代理中使用它 以下是一个完整的工作和注释示例:
import sys
from PyQt4 import QtGui, QtCore
class BorderItemDelegate(QtGui.QStyledItemDelegate):
def __init__(self, parent, borderRole):
super(BorderItemDelegate, self).__init__(parent)
self.borderRole = borderRole
def sizeHint(self, option, index):
size = super(BorderItemDelegate, self).sizeHint(option, index)
pen = index.data(self.borderRole).toPyObject()
if pen is not None:
# Make some room for the border
# When width is 0, it is a cosmetic pen which
# will be 1 pixel anyways, so set it to 1
width = max(pen.width(), 1)
size = size + QtCore.QSize(2 * width, 2 * width)
return size
def paint(self, painter, option, index):
pen = index.data(self.borderRole).toPyObject()
# copy the rect for later...
rect = QtCore.QRect(option.rect)
if pen is not None:
width = max(pen.width(), 1)
# ...and remove the extra room we added in sizeHint...
option.rect.adjust(width, width, -width, -width)
# ...before painting with the base class method...
super(BorderItemDelegate, self).paint(painter, option, index)
# ...then paint the borders
if pen is not None:
painter.save()
# The pen is drawn centered on the rectangle lines
# with pen.width()/2 width on each side of these lines.
# So, rather than shifting the drawing of pen.width()/2
# we double the pen width and clip the part that would
# go outside the rect.
painter.setClipRect(rect, QtCore.Qt.ReplaceClip);
pen.setWidth(2 * width)
painter.setPen(pen)
painter.drawRect(rect)
painter.restore()
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
mainWindow = QtGui.QMainWindow()
mainWindow.resize(300,300);
# Define the Qt.ItemDataRole we will be using
MyBorderRole = QtCore.Qt.UserRole + 1
# Create and populate the view
treeWidget = QtGui.QTreeWidget(mainWindow)
for i in range(3):
item = QtGui.QTreeWidgetItem(["Item %d"%(i)])
treeWidget.addTopLevelItem(item)
treeWidget.expandItem(item);
for j in range(10):
subItem = QtGui.QTreeWidgetItem(["SubItem %d %d"%(i,j)])
pen = QtGui.QPen(QtGui.QColor.fromHsv(j*25, 255, 255))
pen.setWidth(j)
# Store the border pen in the item as the role we defined
subItem.setData(0, MyBorderRole, pen)
item.addChild(subItem)
# Pass the role where we stored the border pen to the delegate constructor
delegate = BorderItemDelegate(treeWidget, MyBorderRole)
treeWidget.setItemDelegate(delegate)
mainWindow.setCentralWidget(treeWidget)
mainWindow.show()
sys.exit(app.exec_())
太棒了!如果所有这些回答都是如此清晰、简洁和有用就好了。我永远欠你的债!愚蠢的问题,现在,如何删除项目的边框?例如,我可以更改其颜色,将其宽度设置为0,但仍保留边框的轮廓。通过使用
项将数据设置为None
。setData(0,MyBorderRole,None)