做p2p网站的公司,怎样汉化wordpress主题,设计制作合同范本,网站的数据库有什么用该系列持续更新#xff0c;喜欢请一键三连#xff0c;感谢各位大佬。 QT5.14.2 参考官方QT助手 文章目录 QTreeWidget ClasspropertiesPublic Functions默认构造函数默认析构函数添加根节点void addTopLevelItem(QTreeWidgetItem *item)添加多个根节点void addTopLevelItems…该系列持续更新喜欢请一键三连感谢各位大佬。 QT5.14.2 参考官方QT助手 文章目录 QTreeWidget ClasspropertiesPublic Functions默认构造函数默认析构函数添加根节点void addTopLevelItem(QTreeWidgetItem *item)添加多个根节点void addTopLevelItems(const QListQTreeWidgetItem * items)关闭编辑void closePersistentEditor(QTreeWidgetItem *item, int column 0)获取列数int columnCount() const返回当前选中列int currentColumn() const返回当前选中QTreeWidgetItem *currentItem() const没用void editItem(QTreeWidgetItem *item, int column 0)查找满足条件的item返回QListQTreeWidgetItem * findItems(const QString text, Qt::MatchFlags flags, int column 0) const返回表头QTreeWidgetItem *headerItem() const返回index索引根据item int indexOfTopLevelItem(QTreeWidgetItem *item) const在指定索引位置插入新的top节点void insertTopLevelItem(int index, QTreeWidgetItem *item)插入多个top节点void insertTopLevelItems(int index, const QListQTreeWidgetItem * items)递归访问所有根节点 返回一个模拟节点作为所有根节点的父节点QTreeWidgetItem *invisibleRootItem() const节点是否为可编辑状态bool isPersistentEditorOpen(QTreeWidgetItem *item, int column 0) const不分层级获取上层相邻节点QTreeWidgetItem *itemAbove(const QTreeWidgetItem *item) const根据坐标返回节点QTreeWidgetItem *itemAt(const QPoint p) const同上直接输入坐标QTreeWidgetItem *itemAt(int x, int y) const返回显示出的下层节点QTreeWidgetItem *itemBelow(const QTreeWidgetItem *item) const QTreeWidget Class
The QTreeWidget class provides a tree view that uses a predefined tree model. More… QTreeWidget类提供了一个使用预定义树模型的树视图。
Header:#include qmake:QT widgets Inherits:QTreeView
List of all members, including inherited members 所有成员的列表包括继承的成员 Obsolete members 过时的成员
properties
columnCount : int topLevelItemCount : const int
Public Functions
默认构造函数
QTreeWidget::QTreeWidget(QWidget *parent nullptr) 示例
// 创建 QTreeWidget 对象
QTreeWidget *tree new QTreeWidget;
tree-setColumnCount(3); // 设置列数为 3
tree-setHeaderLabels({ Name, Value, Data }); // 设置列标签
tree-header()-setSectionResizeMode(QHeaderView::ResizeToContents); // 自适应列宽默认析构函数
QTreeWidget::~QTreeWidget()
添加根节点void addTopLevelItem(QTreeWidgetItem *item) 示例
// 创建根节点
QTreeWidgetItem *root new QTreeWidgetItem(tree);
root-setText(0, Root);
root-setText(1, 0);
root-setData(2, Qt::UserRole, root data);
tree-addTopLevelItem(root);添加多个根节点void addTopLevelItems(const QListQTreeWidgetItem * items) 示例
// 创建根节点
QTreeWidgetItem *root new QTreeWidgetItem(tree);
root-setText(0, Root);
root-setText(1, 0);
root-setData(2, Qt::UserRole, root data);
//tree-addTopLevelItem(root);
QListQTreeWidgetItem* all_root_list;
all_root_list.push_back(root);
QTreeWidgetItem *root1 new QTreeWidgetItem(tree);
root1-setText(0, Root2);
all_root_list.push_back(root1);
tree-addTopLevelItems(all_root_list);关闭编辑void closePersistentEditor(QTreeWidgetItem *item, int column 0) 关闭item编辑器如果是关闭的则此函数无效。 先打开看效果是这样的
tree-openPersistentEditor(root);然后再调用closePersistentEditor
tree-openPersistentEditor(root);
tree-closePersistentEditor(root);获取列数int columnCount() const qDebug() tree-columnCount:tree-columnCount();返回当前选中列int currentColumn() const 默认-1点击选中哪列返回列号索引从0开始。
qDebug() tree-currentColumn: tree-currentColumn();
connect(tree, QTreeWidget::itemClicked, this, [] {qDebug() tree-currentColumn: tree-currentColumn();
});返回当前选中QTreeWidgetItem *currentItem() const 默认是NULL
QTreeWidgetItem* selectItem tree-currentItem();没用void editItem(QTreeWidgetItem *item, int column 0) 查找满足条件的item返回QListQTreeWidgetItem * findItems(const QString text, Qt::MatchFlags flags, int column 0) const 查找包含字符串ro的item以字符串不分大小写匹配第二个参数是匹配规则为枚举类型详见qt官方文档说明
QListQTreeWidgetItem* find_items tree-findItems(ro,Qt::MatchContains);
for (auto item:find_items)
{qDebug() item-text(0);
}返回表头QTreeWidgetItem *headerItem() const QTreeWidgetItem* hearderItem tree-headerItem();
qDebug() hearderItem-text(0);
qDebug() hearderItem-text(1);
qDebug() hearderItem-text(2);
qDebug() hearderItem-text(3);返回index索引根据item int indexOfTopLevelItem(QTreeWidgetItem *item) const 只能获取到top节点索引
qDebug() tree-indexOfTopLevelItem(nullptr);
qDebug() tree-indexOfTopLevelItem(root);
qDebug() tree-indexOfTopLevelItem(child2);
qDebug() tree-indexOfTopLevelItem(root1);在指定索引位置插入新的top节点void insertTopLevelItem(int index, QTreeWidgetItem *item) 插入qstring超过列数则不显示
QStringList insertitem;
insertitem insertroot i2 2133 122344;
tree-insertTopLevelItem(1, new QTreeWidgetItem(insertitem));插入多个top节点void insertTopLevelItems(int index, const QListQTreeWidgetItem * items) QStringList insertitem;
insertitem insertroot i2 2133;
QListQTreeWidgetItem* qtree_widget_list;
qtree_widget_list.push_back(new QTreeWidgetItem(insertitem));
insertitem.clear();
insertitem insertroot2;
qtree_widget_list.push_back(new QTreeWidgetItem(insertitem));
tree-insertTopLevelItems(0, qtree_widget_list);递归访问所有根节点 返回一个模拟节点作为所有根节点的父节点QTreeWidgetItem *invisibleRootItem() const 以该形式遍历所有根节点
QTreeWidgetItem* one tree-invisibleRootItem();
int nums one-childCount();
for (int i0;inums;i)
{qDebug() one-child(i)-text(0);
}节点是否为可编辑状态bool isPersistentEditorOpen(QTreeWidgetItem *item, int column 0) const 获取item是否为可编辑状态qt5.10之后版本才有这个函数
qDebug() tree-isPersistentEditorOpen(root);
tree-openPersistentEditor(root);
qDebug() tree-isPersistentEditorOpen(root);
tree-closePersistentEditor(root);
qDebug() tree-isPersistentEditorOpen(root);不分层级获取上层相邻节点QTreeWidgetItem *itemAbove(const QTreeWidgetItem *item) const 只能获取到展开节点所以开始之前先调用expandAll()否则获取到的为显示的相邻节点。 若没有显示出来的上层节点则返回空指针。
tree-expandAll();
QTreeWidgetItem* t1 tree-itemAbove(root);
if (t1)qDebug() t1-text(0);
t1 tree-itemAbove(child1);
if (t1)qDebug() t1-text(0);
t1 tree-itemAbove(root1);
if (t1)qDebug() t1-text(0);根据坐标返回节点QTreeWidgetItem *itemAt(const QPoint p) const 树形控件内部坐标左上角为00点如果对应坐标没有节点返回NULL
QPoint* p1 new QPoint(0, 0);
QTreeWidgetItem* t1 tree-itemAt(*p1);
if (t1)qDebug() t1-text(0);
QPoint* p2 new QPoint(0, 40);
t1 tree-itemAt(*p2);
if (t1)qDebug() t1-text(0);同上直接输入坐标QTreeWidgetItem *itemAt(int x, int y) const 同上
返回显示出的下层节点QTreeWidgetItem *itemBelow(const QTreeWidgetItem *item) const 同itemAbove只是取得下层节点没有下层则返回空指针
