QAbstractItemView为截断的项显示ToolTip(使用事件过滤)
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在Qt中想要为QAbstractItemView中长度不够而使得内容被截断的项显示ToolTip,Qt官网有一篇文章介绍使用事件过滤器来显示太长的项,但是没有涵盖图标的情况、显示列头项太长的情况等等,这里做了下修改,以符合现在所需。
环境:Qt 5.1.0
atooltipper.h
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#ifndef ATOOLTIPPER_H
#define ATOOLTIPPER_H #include <QObject> class AToolTipper : public QObject { Q_OBJECT public: explicit AToolTipper(QObject *parent = 0); virtual bool eventFilter(QObject *, QEvent *); protected: bool headerViewEventFilter(QObject *, QEvent *); }; #endif // ATOOLTIPPER_H |
atooltipper.cpp
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#include "atooltipper.h"
#include <QHelpEvent> #include <QAbstractItemView> #include <QHeaderView> #include <QTreeView> #include <QTableView> #include <QToolTip> AToolTipper::AToolTipper(QObject *parent) : QObject(parent) { } bool AToolTipper::eventFilter(QObject *obj, QEvent *event) { if (event->type() == QEvent::ToolTip) { QAbstractItemView *view = qobject_cast<QAbstractItemView*>(obj->parent()); if (!view) { return false; } QHeaderView *headerView = qobject_cast<QHeaderView*>(view); if (headerView) { return headerViewEventFilter(obj, event); } QHelpEvent *helpEvent = static_cast<QHelpEvent*>(event); QPoint pos = helpEvent->pos(); QModelIndex index = view->indexAt(pos); if (!index.isValid()) { return false; } QString itemText = view->model()->data(index).toString(); // 图标处理 QSize iconSize(0, 0); QIcon icon = view->model()->data(index, Qt::DecorationRole).value<QIcon>(); if (!icon.isNull()) { QList<QSize> listSize = icon.availableSizes(); if (listSize.size() > 0) { iconSize.setWidth(listSize.at(0).width()); iconSize.setHeight(listSize.at(0).height()); } } // 计算列头高度 int headerHeight = 0; int headerWidth = 0; QTreeView *treeView = qobject_cast<QTreeView*>(view); if (treeView) { headerHeight = treeView->header()->height(); } else { QTableView *tableView = qobject_cast<QTableView*>(view); if (tableView) { headerHeight = tableView->horizontalHeader()->height(); headerWidth = tableView->verticalHeader()->width(); } } // 文本边距 const int textMargin = view->style()->pixelMetric(QStyle::PM_FocusFrameHMargin) + 1; const int iconMargin = iconSize.width() > 0 ? (view->style()->pixelMetric(QStyle::PM_FocusFrameHMargin) + 1) : 0; QRect rect = view->visualRect(index); QRect textRect = rect.adjusted(textMargin + iconSize.width() + iconMargin * 2, 0, -textMargin, 0); //实际可用矩形 QFontMetrics fm(view->font()); int flags = view->model()->data(index, Qt::TextAlignmentRole).toInt(); QSize itemTextSize = fm.boundingRect(textRect, flags | Qt::TextLongestVariant | Qt::TextWordWrap, itemText).size(); if ((itemTextSize.width() > textRect.width() || itemTextSize.height() > textRect.height()) && !itemText.isEmpty()) { // 指定tip的限定矩形 rect.adjust(headerWidth, headerHeight, headerWidth, headerHeight); QToolTip::showText(helpEvent->globalPos(), itemText, view, rect); } else { QToolTip::hideText(); } return true; } return false; } bool AToolTipper::headerViewEventFilter(QObject *obj, QEvent *event) { if (event->type() == QEvent::ToolTip) { QHeaderView *headerView = qobject_cast<QHeaderView*>(obj->parent()); if (!headerView) { return false; } QHelpEvent *helpEvent = static_cast<QHelpEvent*>(event); QPoint pos = helpEvent->pos(); int index = headerView->logicalIndexAt(pos); if (index < 0) { return false; } QString itemText = headerView->model()->headerData(index, headerView->orientation()).toString(); const int textMargin = headerView->style()->pixelMetric(QStyle::PM_FocusFrameHMargin) + 1; int rectWidth = headerView->sectionSize(index) - textMargin * 2; int rectHeight = headerView->sizeHint().height(); QFontMetrics fm(headerView->font()); int flag = headerView->model()->headerData(index, headerView->orientation(), Qt::TextAlignmentRole).toInt(); QSize itemTextSize = fm.size(flag, itemText); if ((itemTextSize.width() > rectWidth || itemTextSize.height() > rectHeight) && !itemText.isEmpty()) { QToolTip::showText(helpEvent->globalPos(), itemText, headerView); } else { QToolTip::hideText(); } return true; } return false; } |
使用示例:
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tableView->viewport()->installEventFilter(new AToolTipper(tableView));
tableView->horizontalHeader()->viewport()->installEventFilter(new AToolTipper(tableView->horizontalHeader())); |
效果图:
参考资料:
1.Show_tooltips_for_long_entries_of_your_custom_model http://qt-project.org/wiki/Show_tooltips_for_long_entries_of_your_custom_model
2.Tooltips for truncated items in a QTreeView http://www.mimec.org/node/337
http://blog.csdn.net/akof1314/article/details/14504747
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