让QTreeView默认选中第一行？

[weixin_38049070]

QT 4.7.3中的examples/itemviews/dirview例子中，怎么才能让QTreeView默认选中第一行？即程序运行后是图1的效果： 必须按一下Home键或者方向才能获得图2的效果： 我想程序一运行后，就是图2的效果，怎么实现？谢谢！

[weixin_38066102]

谢谢大家的指教，还是不行。调试了一下：貌似 QModelIndex current = tree.currentIndex(); 返回的是QModelIndex(-1,-1,0x0,QObject(0x0) )。所以setCurrentIndex(current, QItemSelectionModel::SelectCurrent);就没用了。怎么才能获得“aa"这项的index呢？借用alexltr的方法，改进一下，也是不行的。    QModelIndex current = tree.rootIndex();    qDebug() << current;    QString path = model.filePath(current);    qDebug() << "a::::"<<path;    path += "/aa";   QModelIndex cc = model.index(0, 0, current);//    QModelIndex cc = model.index(path, 0);    qDebug() << cc;    path = model.filePath(cc);    qDebug() << "a::::"<<path;    tree.setCurrentIndex(cc);

[weixin_38062058]

試試這個行不行, 我在windows7下試了可以.tree.setCurrentIndex(model.index(0,0,model.index(0,0,model.index(QDir::currentPath()))));

[weixin_38054042]

试了，还是不行。贴个代码各位大虾帮忙分析一下。谢谢。int main(int argc, char *argv[]){       QApplication app(argc, argv);          QFileSystemModel model;    model.setRootPath("");    QTreeView tree;    tree.setModel(&model);                       QString dir("./dir");     tree.setRootIndex(model.index((dir)));                                   // Demonstrating look and feel features    tree.setAnimated(false);    tree.setIndentation(20);    tree.setSortingEnabled(true);        tree.setAlternatingRowColors(true);            tree.setWindowTitle(QObject::tr("Dir View"));    tree.resize(640, 480);            QModelIndex current = tree.currentIndex();      tree.selectionModel()->setCurrentIndex(current, QItemSelectionModel::SelectCurrent);    tree.show();        return app.exec();}

[weixin_38121538]

帮顶

[weixin_38104476]

发送个信号模拟选中的操作

[weixin_38091368]

木有人能解决这个问题哦。哎～～

[weixin_38070905]

楼上的兄弟的代码确实可以实现选中第一行。但是，刚打开的时候，只是有一个根，不会像我的打开时，根底下的第一级目录都已经列出来了。其实就是多了：    QString dir("/");    tree.setRootIndex(model.index((dir)));这两行代码。

[weixin_38067396]

以下代碼在windows xp + Qt4.7.1下OK. [code/]#include <QtGui> int main(int argc, char *argv[]){    QApplication app(argc, argv);     QFileSystemModel model;    model.setRootPath("");    QTreeView tree;    tree.setModel(&model);    tree.setCurrentIndex(model.index(0,0,model.index(0,0,model.index(QDir::currentPath()))));     tree.setWindowTitle(QObject::tr("Dir View"));    tree.resize(640, 480);    tree.show();     return app.exec();}[/code]

[斜阳日落]

setCurrentIndex

[斜阳日落]

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QFileSystemModel model;
model.setRootPath("");
QTreeView tree;
tree.setModel(&model);
QString dir("./dir");
tree.setRootIndex(model.index((dir)));
tree.setAnimated(false);
tree.setIndentation(20);
tree.setSortingEnabled(true);
tree.setAlternatingRowColors(true);
tree.setWindowTitle(QObject::tr("Dir View"));
tree.resize(640, 480);

      tree.selectionModel()->setCurrentIndex(0,0);
    tree.show();   

[xjz1994]

怎么默认选中多行啊

[C++ Super Man]

用finditems先找到那个index,然后用setcurrentindex选中，然后用scrolltoindex让界面滚动到该行