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我目前正在尝试围绕模型视图方法进行思考并编写缩略图查看器应用程序。

在此示例中，我只是尝试绘制 20 个框，但我得到的似乎是随机选择，会随着鼠标移动而更新。滚动使事情变得更糟，有时只绘制框等。而且文本似乎根本没有呈现。

对我来说，这看起来像是绘制方法的刷新/更新问题。我在这里错过了什么吗？

油漆问题

最终我需要展示很多项目。所有这些都包含一些标签和一个需要在运行时更新的像素图。所以我认为画它们是最快的解决方案。或者，我尝试在paint方法中渲染我的小部件：

customWidget.render(painter, QtCore.QPoint(0,0), renderFlags=QtGui.QWidget.DrawChildren)

这似乎更慢，但至少工作。

这是一个最小的工作示例来说明我的问题：

import sys
from PySide import QtCore
from PySide import QtGui

elements = range(20)

class ElementListModel(QtCore.QAbstractListModel):
    def __init__(self, elements = [], parent = None):
        super(ElementListModel, self).__init__()
        self.__elements = elements

    def rowCount(self, parent):
        return len(self.__elements)

    def data(self, index, role):
        if role == QtCore.Qt.DisplayRole:
            return str(self.__elements[index.row()])

class ElementThumbDelegate(QtGui.QStyledItemDelegate):
    def __init__(self, view, parent=None):
        super(ElementThumbDelegate, self).__init__(parent)

    def paint(self, painter, options, index):

        width = options.rect.width()
        height = options.rect.height()

        painter.setRenderHint(QtGui.QPainter.Antialiasing)
        painter.setPen(QtGui.QColor(255, 255, 255))
        painter.setBrush(QtGui.QColor(10, 10, 10))
        painter.drawRect(0, 0, width, height)
        painter.drawText(options.rect, QtCore.Qt.AlignHCenter | QtCore.Qt.AlignVCenter, str(index.data()))
        painter.translate(options.rect.topLeft())

    def sizeHint(self, options, index):
        return QtCore.QSize(50, 50)

def main():
    app = QtGui.QApplication(sys.argv)
    viewer = QtGui.QListView()

    viewModel = ElementListModel(elements)
    viewer.setModel(viewModel)
    viewer.setViewMode(QtGui.QListView.IconMode)
    viewer.setItemDelegate(ElementThumbDelegate(viewer))

    viewer.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

提前致谢。任何帮助或指示下一步将不胜感激！

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1 回答 1

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事实证明，painter.translate()结合在查看器原点 (0,0) 处绘制框正在与自动定位作斗争并导致问题。

代理到适当位置的翻译由视图本身处理 - 无需手动执行。

工作代码：

import sys
from PySide import QtCore
from PySide import QtGui

elements = range(20)

class ElementListModel(QtCore.QAbstractListModel):
    def __init__(self, elements = [], parent = None):
        super(ElementListModel, self).__init__()
        self.__elements = elements

    def rowCount(self, parent):
        return len(self.__elements)

    def data(self, index, role):
        if role == QtCore.Qt.DisplayRole:
            return str(self.__elements[index.row()])

class ElementThumbDelegate(QtGui.QStyledItemDelegate):
    def __init__(self, view, parent=None):
        super(ElementThumbDelegate, self).__init__(parent)

    def paint(self, painter, options, index):
        painter.setRenderHint(QtGui.QPainter.Antialiasing)
        painter.setPen(QtGui.QColor(255, 255, 255))
        painter.setBrush(QtGui.QColor(10, 10, 10))
        painter.drawRect(options.rect)
        painter.drawText(options.rect, QtCore.Qt.AlignHCenter | QtCore.Qt.AlignVCenter, str(index.data()))

    def sizeHint(self, options, index):
        return QtCore.QSize(50, 50)

def main():
    app = QtGui.QApplication(sys.argv)
    viewer = QtGui.QListView()

    viewModel = ElementListModel(elements)
    viewer.setModel(viewModel)
    viewer.setViewMode(QtGui.QListView.IconMode)
    viewer.setItemDelegate(ElementThumbDelegate(viewer))

    viewer.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()
于 2016-10-23T16:23:35.517 回答