QTextEdit 设置背景图片与拉伸背景图片

首先，通过一个文件选择对话打开一张图片，然后把这张图片设置为编辑框背景。参考具体代码：

QString name = QFileDialog::getOpenFileName(this, tr("Open File..."),
QString(), tr("IMAGE-Files (*.jpg *.png *.gif *.bmp *.jpeg)"));

if (name.length() > 0)
{
mBackPicName = name;
mBackPic = new QPixmap(name);
if (mBackPic == 0)
return;
QPalette palette = m_ui->con_edit_example->palette();
palette.setBrush(QPalette::Base, QBrush((mBackPic->scaled(m_ui->con_edit_example->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation))));
m_ui->con_edit_example->setPalette(palette);
//m_ui->con_edit_example->setAutoFillBackground(FALSE);
update();
}