QTreeView实现搜索功能并且关键字标红

1、需求描述

实现组织树搜索，关键字红色显示；搜索规则，名称匹配显示，没有匹配不显示，子节点匹配，父节点即使没有匹配也显示；

2.实现方法

（1）top节点名称匹配关键则显示，否则隐藏

void TreeTaskList::SlotFilterChanged(QString strText)
{m_TreeDelegate->setProperty("FilterString", strText);//给代理设置搜索关键字
    QRegExp regExp(strText, Qt::CaseInsensitive);for (int i = 0; i < m_modelTree->rowCount(); i++){QStandardItem* topitem = m_modelTree->item(i, 0);bool iret = RecluserFindItem(topitem, regExp);QString strName = topitem->data(Qt::UserRole).toMap().value("name").toString();if (strName.contains(regExp) || iret == false){ui.treeView->setRowHidden(i, topitem->index().parent(), false);}else{ui.treeView->setRowHidden(i, topitem->index().parent(), true);}}
}

（2）递归查看子节点名称是否匹配

如果子节点包含关键字，父节点没有包含关键字也要显示

bool TreeTaskList::RecluserFindItem(QStandardItem* pFItem, QRegExp strText)
{bool rethidden = true;if (pFItem == NULL){return rethidden;}int rowcount = pFItem->rowCount();for (int c = rowcount - 1; c >= 0; c--){QStandardItem* childItem = pFItem->child(c, 0);if (childItem != NULL){if (strText.isEmpty()){ui.treeView->setRowHidden(c, pFItem->index(), false);RecluserFindItem(childItem, strText);rethidden = false;}else{bool childret = RecluserFindItem(childItem, strText);if (childret == false){rethidden = false;}QString strName = childItem->data(Qt::UserRole).toMap().value("name").toString();if (strName.contains(strText) || childret == false){ui.treeView->setRowHidden(c, pFItem->index(), false);rethidden = false;}else{ui.treeView->setRowHidden(c, pFItem->index(), true);}}}}return rethidden;
}

（3）匹配文字显示红色

要使搜索关键字变成红色，需要在代理中重写代理的paintevent函数，绘制文字颜色；根据设置给代理的属性"FilterString"，就是搜索关键字，匹配名称，匹配的关键字设置为红色，文字长度超出范围，增加省略号；

void TreeTaskDelegate::paintName(QPainter *painter,QRect rect,QString strName) const
{QString filter = this->property("FilterString").isValid() ? this->property("FilterString").toString() : "";painter->save();QColor text_color = QColor(255, 255, 255, 0.7);          // 文本颜色QColor filter_color = QColor(250, 50, 57, 255);      // 高亮颜色// 高亮文本QString filter_text = filter;  // 文字与过滤文字首先获取出来QString text = strName;QFont font;font.setPixelSize(16);font.setFamily("Microsoft YaHei UI");painter->setFont(font);QFontMetrics font_metrics(font);int realwidth=font_metrics.width(text);int text_width = rect.width();QTextDocument m_LabelName;m_LabelName.setDefaultFont(font);// 右部显示省略号
    QFontMetrics font_width(font);//text = font_width.elidedText(text, Qt::ElideRight, text_width);// 然后将匹配项加上font-color标签，若非空的话if (!filter_text.isEmpty()){int last_index = text.lastIndexOf(filter_text, -1, Qt::CaseInsensitive);while (last_index != -1){text.insert(last_index + filter_text.length(), "</font>");text.insert(last_index, QString("<font color=%1>").arg(filter_color.name()));last_index = text.lastIndexOf(filter_text, last_index, Qt::CaseInsensitive);}}// 在文档中设置字体，并设置文字QString strColorText = QString("<font color=%1>%2</font>").arg(text_color.name()).arg(text);m_LabelName.setHtml(strColorText);int y =40;//居中显示高度y = (y - 24) / 2;if (y < 0){y = 0;}QRect text_rect = rect;  // 文字高度为20，所以文字上下空白为6pxint h1 = text_rect.height();int h2 = font_metrics.height();painter->translate(QPoint(text_rect.x(), text_rect.y() -2));// +(text_rect.height() - font_metrics.height()) / 2)m_LabelName.drawContents(painter, text_rect.translated(-text_rect.x(), -text_rect.y()));painter->restore();if (realwidth > text_rect.width())//超过长度绘制省略号
    {QRect rectsl = QRect(text_rect.right()+1, text_rect.y(), 20, 24);painter->drawText(rectsl, Qt::AlignLeft | Qt::AlignVCenter, "…");}
}