如何使项目视图在 PyQt 中呈现丰富的（html）文本？

Question

我正在尝试在 python 中翻译来自this thread 的代码：

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

__data__ = [
        "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.",
        "Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.",
        "Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.",
        "Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
    ]

def get_html_box(text):
    return '''<table border="0" width="100%"><tr width="100%" valign="top">
        <td width="1%"><img src="softwarecenter.png"/></td>
        <td><table border="0" width="100%" height="100%">
        <tr><td><b><a href="http://www.google.com">titolo</a></b></td></tr>
        <tr><td>{0}</td></tr><tr><td align="right">88/88/8888, 88:88</td></tr>
        </table></td></tr></table>'''.format(text)

class HTMLDelegate(QStyledItemDelegate):

    def paint(self, painter, option, index):
        model = index.model()
        record = model.listdata[index.row()]
        doc = QTextDocument(self)
        doc.setHtml(get_html_box(record))
        doc.setTextWidth(option.rect.width())
        painter.save()
        ctx = QAbstractTextDocumentLayout.PaintContext()
        ctx.clip = QRectF(0, option.rect.top(), option.rect.width(), option.rect.height())
        dl = doc.documentLayout()
        dl.draw(painter, ctx)
        painter.restore()

    def sizeHint(self, option, index):
        model = index.model()
        record = model.listdata[index.row()]
        doc = QTextDocument(self)
        doc.setHtml(get_html_box(record))
        doc.setTextWidth(option.rect.width())
        return QSize(doc.idealWidth(), doc.size().height())

class MyListModel(QAbstractListModel):

    def __init__(self, parent=None, *args):
        super(MyListModel, self).__init__(parent, *args)
        self.listdata = __data__

    def rowCount(self, parent=QModelIndex()):
        return len(self.listdata)

    def data(self, index, role=Qt.DisplayRole):
        return index.isValid() and QVariant(self.listdata[index.row()]) or QVariant()

class MyWindow(QWidget):

    def __init__(self, *args):
        super(MyWindow, self).__init__(*args)
        # listview
        self.lv = QListView()
        self.lv.setModel(MyListModel(self))
        self.lv.setItemDelegate(HTMLDelegate(self))
        self.lv.setResizeMode(QListView.Adjust)
        # layout
        layout = QVBoxLayout()
        layout.addWidget(self.lv)
        self.setLayout(layout)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = MyWindow()
    w.show()
    sys.exit(app.exec_())

我猜元素的大小和位置计算不正确，可能是因为我根本不了解原始代码中与样式相关的部分。 有人可以帮我吗？

Answer 1

代码不尊重所需的目标绘图区域 (option.rect)：

ctx.clip = QRectF(0, option.rect.top(), option.rect.width(), option.rect.height())

上面剪辑了QTextDocument绘制到指定区域的部分。您真的想翻译画家，以便它在矩形的topLeft() 处开始绘画，然后延伸到指定的宽度和高度。由于documentLayout() 假设画家在原点（即在它应该绘制的位置），所以这是修复：

def paint(self, painter, option, index):
    model = index.model()
    record = model.listdata[index.row()]
    doc = QTextDocument(self)
    doc.setHtml(get_html_box(record))
    doc.setTextWidth(option.rect.width())
    ctx = QAbstractTextDocumentLayout.PaintContext()

    painter.save()
    painter.translate(option.rect.topLeft());
    painter.setClipRect(option.rect.translated(-option.rect.topLeft()))
    dl = doc.documentLayout()
    dl.draw(painter, ctx)
    painter.restore()