一、QTreeWidget Class

The?QTreeWidget?class provides a tree view that uses a predefined tree model.?More...

Header:	#include <QTreeWidget>
qmake:	QT += widgets
Inherits:	QTreeView

• List of all members, including inherited members
• Obsolete members

Properties

• columnCount?: int
• topLevelItemCount?: const int

Public Functions

?	QTreeWidget(QWidget *parent?= nullptr)
virtual	~QTreeWidget()
void	addTopLevelItem(QTreeWidgetItem *item)
void	addTopLevelItems(const QList<QTreeWidgetItem *> &items)
void	closePersistentEditor(QTreeWidgetItem *item, int?column?= 0)
int	columnCount() const
int	currentColumn() const
QTreeWidgetItem *	currentItem() const
void	editItem(QTreeWidgetItem *item, int?column?= 0)
QList<QTreeWidgetItem *>	findItems(const QString &text, Qt::MatchFlags?flags, int?column?= 0) const
QTreeWidgetItem *	headerItem() const
int	indexOfTopLevelItem(QTreeWidgetItem *item) const
void	insertTopLevelItem(int?index, QTreeWidgetItem *item)
void	insertTopLevelItems(int?index, const QList<QTreeWidgetItem *> &items)
QTreeWidgetItem *	invisibleRootItem() const
bool	isPersistentEditorOpen(QTreeWidgetItem *item, int?column?= 0) const
QTreeWidgetItem *	itemAbove(const QTreeWidgetItem *item) const
QTreeWidgetItem *	itemAt(const QPoint &p) const
QTreeWidgetItem *	itemAt(int?x, int?y) const
QTreeWidgetItem *	itemBelow(const QTreeWidgetItem *item) const
QWidget *	itemWidget(QTreeWidgetItem *item, int?column) const
void	openPersistentEditor(QTreeWidgetItem *item, int?column?= 0)
void	removeItemWidget(QTreeWidgetItem *item, int?column)
QList<QTreeWidgetItem *>	selectedItems() const
void	setColumnCount(int?columns)
void	setCurrentItem(QTreeWidgetItem *item)
void	setCurrentItem(QTreeWidgetItem *item, int?column)
void	setCurrentItem(QTreeWidgetItem *item, int?column, QItemSelectionModel::SelectionFlags?command)
void	setHeaderItem(QTreeWidgetItem *item)
void	setHeaderLabel(const QString &label)
void	setHeaderLabels(const QStringList &labels)
void	setItemWidget(QTreeWidgetItem *item, int?column, QWidget *widget)
int	sortColumn() const
void	sortItems(int?column, Qt::SortOrder?order)
QTreeWidgetItem *	takeTopLevelItem(int?index)
QTreeWidgetItem *	topLevelItem(int?index) const
int	topLevelItemCount() const
QRect	visualItemRect(const QTreeWidgetItem *item) const

Reimplemented Public Functions

virtual void

setSelectionModel(QItemSelectionModel *selectionModel) override

Public Slots

void	clear()
void	collapseItem(const QTreeWidgetItem *item)
void	expandItem(const QTreeWidgetItem *item)
void	scrollToItem(const QTreeWidgetItem *item, QAbstractItemView::ScrollHint?hint?= EnsureVisible)

Signals

void	currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous)
void	itemActivated(QTreeWidgetItem *item, int?column)
void	itemChanged(QTreeWidgetItem *item, int?column)
void	itemClicked(QTreeWidgetItem *item, int?column)
void	itemCollapsed(QTreeWidgetItem *item)
void	itemDoubleClicked(QTreeWidgetItem *item, int?column)
void	itemEntered(QTreeWidgetItem *item, int?column)
void	itemExpanded(QTreeWidgetItem *item)
void	itemPressed(QTreeWidgetItem *item, int?column)
void	itemSelectionChanged()

Protected Functions

virtual bool	dropMimeData(QTreeWidgetItem *parent, int?index, const QMimeData *data, Qt::DropAction?action)
QModelIndex	indexFromItem(const QTreeWidgetItem *item, int?column?= 0) const
QTreeWidgetItem *	itemFromIndex(const QModelIndex &index) const
virtual QMimeData *	mimeData(const QList<QTreeWidgetItem *>?items) const
virtual QStringList	mimeTypes() const
virtual Qt::DropActions	supportedDropActions() const

Reimplemented Protected Functions

virtual void	dropEvent(QDropEvent *event) override
virtual bool	event(QEvent *e) override

Detailed Description

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The?QTreeWidget?class is a convenience class that provides a standard tree widget with a classic item-based interface similar to that used by the?QListView?class in Qt 3. This class is based on Qt's Model/View architecture and uses a default model to hold items, each of which is a?QTreeWidgetItem.

Developers who do not need the flexibility of the Model/View framework can use this class to create simple hierarchical lists very easily. A more flexible approach involves combining a?QTreeView?with a standard item model. This allows the storage of data to be separated from its representation.

In its simplest form, a tree widget can be constructed in the following way:

QTreeWidget *treeWidget = new QTreeWidget(); treeWidget->setColumnCount(1); QList<QTreeWidgetItem *> items; for (int i = 0; i < 10; ++i)items.append(new QTreeWidgetItem((QTreeWidget*)0, QStringList(QString("item: %1").arg(i)))); treeWidget->insertTopLevelItems(0, items);

Before items can be added to the tree widget, the number of columns must be set with?setColumnCount(). This allows each item to have one or more labels or other decorations. The number of columns in use can be found with the?columnCount() function.

The tree can have a header that contains a section for each column in the widget. It is easiest to set up the labels for each section by supplying a list of strings with?setHeaderLabels(), but a custom header can be constructed with a?QTreeWidgetItem?and inserted into the tree with the?setHeaderItem() function.

The items in the tree can be sorted by column according to a predefined sort order. If sorting is enabled, the user can sort the items by clicking on a column header. Sorting can be enabled or disabled by calling?setSortingEnabled(). The?isSortingEnabled()?function indicates whether sorting is enabled.

See also?QTreeWidgetItem,?QTreeWidgetItemIterator,?QTreeView,?Model/View Programming, and?Settings Editor Example.

二、QTreeWidget的一些基本操作

1.insertTopLevelItems，insertTopLevelItem用來添加頂層的item

QTreeWidget *treeWidget = new QTreeWidget(this);//創建 treeWidget->setColumnCount(1); //設置列 treeWidget->setHeaderLabel(tr("item tree")); //設置標題 treeWidget->setGeometry(0,0,this->width(),this->height()); //設置大小 QList<QTreeWidgetItem *> items;//創建兩個節點 QTreeWidgetItem *fItem1 = new QTreeWidgetItem(treeWidget,QStringList(QString("f1"))); QTreeWidgetItem *fItem2 = new QTreeWidgetItem(treeWidget,QStringList(QString("f2")));items.append(fItem1); items.append(fItem2); //添加頂層節點 treeWidget->insertTopLevelItems(0,items); //節點始終保持展開 treeWidget->setItemsExpandable(false); treeWidget->expandAll();

2.父節點通過addChild增加子節點

//創建子節點 QTreeWidgetItem *fItem1a = new QTreeWidgetItem(fItem1,QStringList(QString("f1a"))); QTreeWidgetItem *fItem1b = new QTreeWidgetItem(fItem1,QStringList(QString("f1b")));QTreeWidgetItem *fItem2a = new QTreeWidgetItem(fItem2,QStringList(QString("f2a"))); QTreeWidgetItem *fItem2b = new QTreeWidgetItem(fItem2,QStringList(QString("f2b")));//添加字節點 fItem1->addChild(fItem1a); fItem1->addChild(fItem1b);fItem2->addChild(fItem2a); fItem2->addChild(fItem2b);

3.建立鼠標點擊右鍵點擊信號檢測

//檢測點擊事件connect(treeWidget,SIGNAL(itemClicked(QTreeWidgetItem*,int)),this,SLOT(itemClick(QTreeWidgetItem*,int)));//檢測鼠標右鍵 treeWidget->setContextMenuPolicy(Qt::CustomContextMenu); connect(treeWidget,SIGNAL(customContextMenuRequested(const QPoint&)), this,SLOT(popMenu(const QPoint&)));

4.槽函數

void Widget::itemClick(QTreeWidgetItem *item, int column) {QTreeWidgetItem *parent = item->parent(); //獲取父節點if(NULL==parent) //注意：最頂端項是沒有父節點的return;int col = parent->indexOfChild(item); //item在父項中的節點行號(從0開始) }//彈出菜單 void Widget::popMenu(const QPoint &) {QTreeWidgetItem* curItem=treeWidget->currentItem(); //**獲取當前被點擊的節點if(curItem == NULL || curItem->parent() == NULL)return; //右鍵的位置在空白位置右擊或者點擊的是頂層item//創建一個actionQAction deleteItem(QString::fromLocal8Bit("&刪除"),this);connect(&deleteItem, SIGNAL(triggered()), this, SLOT(deleteItem()));QPoint pos;//創建一個菜單欄QMenu menu(treeWidget);menu.addAction(&deleteItem);menu.exec(QCursor::pos()); //在當前鼠標位置顯示 }//刪除item void Widget::deleteItem() {QTreeWidgetItem* curItem=treeWidget->currentItem();curItem->parent()->removeChild(treeWidget->currentItem()); }

三、QTreeWidget例子

#ifndef TREEWIDGET_H #define TREEWIDGET_H #include <QtGui> class TreeWidget : public QWidget { public: TreeWidget(); private: QTreeWidget *tree; }; #endif // TREEWIDGET_H #include "treewidget.h" TreeWidget::TreeWidget() { tree = new QTreeWidget(this); tree->setColumnCount(1); QTreeWidgetItem *root = new QTreeWidgetItem(tree, QStringList(QString("Root"))); QTreeWidgetItem *leaf = new QTreeWidgetItem(root, QStringList(QString("Leaf 1"))); root->addChild(leaf); QTreeWidgetItem *leaf2 = new QTreeWidgetItem(root, QStringList(QString("Leaf 1"))); leaf2->setCheckState(0, Qt::Checked); root->addChild(leaf2); QList<QTreeWidgetItem *> rootList; rootList << root; tree->insertTopLevelItems(0, rootList); }

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