Qt学习笔记【1】

知识点：

QTreeWidget

QTreeWidgetItem

QDockWidget

QVBoxLayout

 

1. Qt的界面布局中使用了层的概念，layout，当主窗口改变后，窗口中控件尺寸随之改变，对于layout需要设置margin。
2. QTreeWidget的基本元素是QTreeWidgetItem，
3. QTreeWidgetItem *styleItem = new QTreeWidgetItem(familyItem);
   //familyItem为styleItem的父节点，QT中所有的窗口控件都是这种方式构造的~

效果图:

 

核心代码如下：

//-----------------------------------------------------------------------dockWidget = new QDockWidget(this);dockWidget->setObjectName(QString::fromUtf8("dockWidget"));dockWidget->setFeatures(QDockWidget::DockWidgetFloatable|QDockWidget::DockWidgetMovable|QDockWidget::AllDockWidgetFeatures);dockWidgetContents = new QWidget();dockWidgetContents->setObjectName(QString::fromUtf8("dockWidgetContents"));vboxLayout = new QVBoxLayout(dockWidgetContents);vboxLayout->setSpacing(60);vboxLayout->setObjectName(QString::fromUtf8("vboxLayout"));mTree = new QTreeWidget(dockWidgetContents);mTree->setObjectName(QString::fromUtf8("scene"));mTree->setSelectionMode(QAbstractItemView::ExtendedSelection);vboxLayout->addWidget(mTree);dockWidget->setWidget(dockWidgetContents);this->addDockWidget(static_cast<Qt::DockWidgetArea>(1), dockWidget);mTree->setColumnCount(1);mTree->setHeaderLabels(QStringList() << tr("Scene"));mTree->setSelectionMode(QAbstractItemView::ExtendedSelection);// Demonstrating look and feel featuresmTree->setAnimated(true);mTree->setIndentation(20);mTree->setSortingEnabled(false);//----------------------------------QTreeWidgetItem *familyItem = new QTreeWidgetItem(mTree);familyItem->setText(0, QString("MyFamily"));//familyItem->setCheckState(0, Qt::Unchecked);QString treeItems[5] = {"One","Two", "Three", "Four", "Five"};for (int i(0); i<5; i++){QTreeWidgetItem *styleItem = new QTreeWidgetItem(familyItem);styleItem->setText(0, treeItems[i]);if (i%2)styleItem->setIcon(0, QIcon("gift.png"));elsestyleItem->setIcon(0, QIcon("gift1.png"));//styleItem->setCheckState(0, Qt::Unchecked);//styleItem->setData(0, Qt::UserRole, QVariant(i));for (int j(0); j<=i; j++){QTreeWidgetItem *childItem = new QTreeWidgetItem(styleItem);childItem->setText(0, "apple");childItem->setIcon(0, QIcon("treeItem.png"));}}//----------------------------------