Using multiple QStyledItemDelegate with stylesheets
- by Shane Holloway
I'm creating a styled QTreeView using double-dispatch to resolve specific delegate for data items, which is working great. I subclassed the delegates from QStyledItemDelegate to take advantage of stylesheets, enabling the designers to style the UI outside of the code.
Unfortunately, I have been unable to address different styles from the CSS. How do I select and use the item sub-control style specified in the stylesheet?
The CSS I'm testing with:
QTreeView::item:selected {
background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #dddddd, stop: 1 #888888);
}
QTreeView::item:selected[role="title"] {
background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #fde7ef, stop: 1 #f1cbda);
}
QTreeView::item:selected[role="entry"] {
background: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #e7effd, stop: 1 #cbdaf1);
}
My delegate rendering classes:
class VisitingDelegate(QtGui.QAbstractItemDelegate):
def __init__(self, parent=None):
super(VisitingDelegate,self).__init__(parent)
roles = {}
self.renderRoles = roles
d = TitleDelegate(parent)
d.setProperty("role", "title")
roles['title'] = d
d = EntryDelegate(parent)
d.setProperty("role", "entry")
roles['entry'] = d
def delegateForIndex(self, mi):
role = mi.model().data(mi, "renderRole")
return self.renderRoles[role]
def paint(self, painter, option, mi):
dg = self.delegateForIndex(mi)
return dg.paint(painter, option, mi)
def sizeHint(self, option, mi):
dg = self.delegateForIndex(mi)
return dg.sizeHint(option, mi)
class TextDocumentDelegate(QtGui.QStyledItemDelegate):
fmt = "<font color='%(color)s'>%(text)s</font)>"
def paint(self, painter, option, mi):
painter.save()
opt = QtGui.QStyleOptionViewItemV4(option)
self.initStyleOption(opt, mi)
opt.text = ''
style = opt.widget.style()
style.drawControl(style.CE_ItemViewItem, opt, painter, opt.widget)
textRect = style.subElementRect(style.SE_ItemViewItemText, opt, opt.widget);
doc = self.asTextDoc(option, mi)
painter.translate(textRect.topLeft())
doc.drawContents(painter)
painter.restore()
def sizeHint(self, option, mi):
doc = self.asTextDoc(option, mi)
sz = doc.size()
sz = QtCore.QSize(sz.width(), sz.height())
return sz
def asTextDoc(self, option, mi):
info = {}
info['text'] = mi.model().data(mi, Qt.DisplayRole)
doc = QtGui.QTextDocument()
doc.setDefaultFont(option.font)
pal = option.palette
if option.state & QtGui.QStyle.State_Selected:
color = pal.color(pal.HighlightedText)
else: color = pal.color(pal.Text)
info['color'] = color.name()
doc.setHtml(self.fmt % info)
return doc
class EntryDelegate(TextDocumentDelegate):
pass
class TitleDelegate(TextDocumentDelegate):
fmt = "<h3><font color='%(color)s'>%(text)s</font)></h3>"
