QTableWidget 安装事件过滤器无法监听到鼠标按下事件
不能直接给该窗体installEventFilter,而是该窗体的viewport添加事件过滤
与此类似的还有：
- QTreeWidget
- QTreeView
- QTableView
- QListWidget
- QListView
- QGraphicsView
在添加事件过滤器的时候，需要给视窗添加，同时在eventFilter重载函数中也需要检测窗口指针。通常情况下继承于QAbstractScrollArea的对象，都需要给viewport添加事件过滤器才会生效。
有如下继承关系图
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QAbstractScrollArea
QAbstractItemView
QColumnView
QHeaderView
QListView
QListWidget
QUndoView
QTableView
QTableWidget
QTreeView
QTreeWidget
QGraphicsView
QMdiArea
QPlainTextEdit
QScrollArea
QTextEdit
QTextBrowser
示例
用户鼠标左键点击的时候，可以知道当前激活的是哪一个窗口，代码示例如下：
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TestDlg::TestDlg(QWidget *parent)
: QDialog(parent)
{
ui.setupUi(this);
m_pHelathTable = ui.tableWidget_health;//展示生命值的table
m_pAttackTable = ui.tableWidget_attack;//展示攻击值的table
m_pHelathTable->setMouseTracking(true);
m_pAttackTable->setMouseTracking(true);
m_pHelathTable->installEventFilter(this);
m_pAttackTable->installEventFilter(this);
}
bool TestDlg::eventFilter(QObject * obj, QEvent * e)
{
if(obj == m_pAttackTable->viewport()){
if(e->type() == QEvent::MouseButtonPress){
QMouseEvent* me = static_cast<QMouseEvent*>(e);
if(me->button() == Qt::LeftButton)
m_curTable = m_pAttackTable;
}
}
else if(obj == m_pHelathTable->viewport()){
if(e->type() == QEvent::MouseButtonPress){
QMouseEvent* me = static_cast<QMouseEvent*>(e);
if(me->button() == Qt::LeftButton)
m_curTable = m_pHelathTable;
}
}
return QDialog::eventFilter(obj,e);
}
树形控件的拖拽事件，不分监听代码如下：
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bool TestDlg::eventFilter(QObject * obj, QEvent * e)
{
if(obj == m_ETTreeWidget->viewport()){
QEvent::Type eType = e->type();
if(eType == QEvent::MouseMove){
printf("MouseMove.\n");
}
else if(eType == QEvent::DragMove){
printf("DragMove.\n");
}
else if(eType == QEvent::DragEnter){
printf("DragEnter.\n");
}
else if(eType == QEvent::Drop){
printf("Drop.\n");
}
}
return QDialog::eventFilter(obj,e);
}
