Question

我正在尝试从python中的this thread翻译代码：

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_())

元素的大小和位置没有正确计算我想，也许是因为我完全不了解原始代码中与样式相关的部分。有人能帮助我吗？

Answer 1

代码不符合所需的目标绘图区域（option.rect）：

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

以上剪辑了QTextDocument绘制到指定区域的部分。你真的想翻译画家，使它开始在矩形的topLeft()上绘画，然后延伸到指定的宽度和高度。由于documentLayout()假设画家位于原点（即应该画出的位置），这就是修正：

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()

如何在PyQt中使项目视图呈现丰富（html）文本？

1 个答案: