本文整理汇总了C++中TreeModel::firstLevel方法的典型用法代码示例。如果您正苦于以下问题：C++ TreeModel::firstLevel方法的具体用法？C++ TreeModel::firstLevel怎么用？C++ TreeModel::firstLevel使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类TreeModel的用法示例。
在下文中一共展示了TreeModel::firstLevel方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: rootIndex
void tst_QColumnView::rootIndex()
{
ColumnView view;
// no model
view.setRootIndex(QModelIndex());
TreeModel model;
view.setModel(&model);
// A top level index
QModelIndex drive = model.firstLevel();
QVERIFY(view.visualRect(drive).isValid());
view.setRootIndex(QModelIndex());
QCOMPARE(view.HorizontalOffset(), 0);
QCOMPARE(view.rootIndex(), QModelIndex());
QVERIFY(view.visualRect(drive).isValid());
// A item under the rootIndex exists
QModelIndex home = model.thirdLevel();
QModelIndex homeFile = model.index(0, 0, home);
int i = 0;
while (i < model.rowCount(home) - 1 && !model.hasChildren(homeFile))
homeFile = model.index(++i, 0, home);
view.setRootIndex(home);
QCOMPARE(view.HorizontalOffset(), 0);
QCOMPARE(view.rootIndex(), home);
QVERIFY(!view.visualRect(drive).isValid());
QVERIFY(!view.visualRect(home).isValid());
if (homeFile.isValid())
QVERIFY(view.visualRect(homeFile).isValid());
// set root when there already is one and everything should still be ok
view.setRootIndex(home);
view.setCurrentIndex(homeFile);
view.scrollTo(model.index(0,0, homeFile));
QCOMPARE(view.HorizontalOffset(), 0);
QCOMPARE(view.rootIndex(), home);
QVERIFY(!view.visualRect(drive).isValid());
QVERIFY(!view.visualRect(home).isValid());
if (homeFile.isValid())
QVERIFY(view.visualRect(homeFile).isValid());
//
homeFile = model.thirdLevel();
home = homeFile.parent();
view.setRootIndex(home);
view.setCurrentIndex(homeFile);
view.show();
i = 0;
QModelIndex two = model.index(0, 0, homeFile);
while (i < model.rowCount(homeFile) - 1 && !model.hasChildren(two))
two = model.index(++i, 0, homeFile);
qApp->processEvents();
QTest::qWait(ANIMATION_DELAY);
view.setCurrentIndex(two);
view.scrollTo(two);
QTest::qWait(ANIMATION_DELAY);
qApp->processEvents();
QVERIFY(two.isValid());
QVERIFY(view.HorizontalOffset() != 0);
view.setRootIndex(homeFile);
QCOMPARE(view.HorizontalOffset(), 0);
}