Qt容器组件（二）之QWidgetStack、QMdiArea、QDockWidget

QT中有九种容器组件，分别是组合框QGroupBox、滚动区QScrollArea、工具箱QToolBox、选项卡QTabWidget、控件栈QWidgetStack、框架QFrame、组件QWidget、MDI窗口显示区QMdiArea、停靠窗口QDockWidget。
本博主要介绍：组合框QGroupBox、滚动区QScrollArea、工具箱QToolBox、选项卡QTabWidget

（1）属性

class Q_WIDGETS_EXPORT QStackedWidget : public QFrame
{
    Q_OBJECT

    Q_PROPERTY(int currentIndex READ currentIndex WRITE setCurrentIndex NOTIFY currentChanged)
    Q_PROPERTY(int count READ count)
    。。。。。。。。。。。。。。。
｝

（2）常用函数

    int addWidget(QWidget *w);
    int insertWidget(int index, QWidget *w);
    void removeWidget(QWidget *w);

    QWidget *currentWidget() const;
    int currentIndex() const;

    int indexOf(QWidget *) const;
    QWidget *widget(int) const;
    int count() const;

（3）信号、槽

public Q_SLOTS:
    void setCurrentIndex(int index);
    void setCurrentWidget(QWidget *w);

Q_SIGNALS:
    void currentChanged(int);
    void widgetRemoved(int index);

（4）示例

#include "mainwindow.h"
#include <QApplication>
#include <QListWidget>
#include <QHBoxLayout>
#include <QLabel>
#include <QStackedWidget>
#include <QObject>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;

    QWidget *pWidget = new QWidget(&w);
    QHBoxLayout *pLayout = new QHBoxLayout(pWidget);
    QStackedWidget *pStackedWidget = new QStackedWidget(pWidget);

    QListWidget* pList = new QListWidget(pWidget);
    pList->insertItem(0, "label0");
    pList->insertItem(1, "label1");
    pList->insertItem(2, "label2");

    QLabel* pLabel0 = new QLabel("label0 test");
    QLabel* pLabel1 = new QLabel("label1 test");
    QLabel* pLabel2 = new QLabel("label2 test");
    pStackedWidget->addWidget(pLabel0);
    pStackedWidget->addWidget(pLabel1);
    pStackedWidget->addWidget(pLabel2);
    w.connect(pList, SIGNAL(currentRowChanged(int)), pStackedWidget, SLOT(setCurrentIndex(int)));

    pLayout->addWidget(pList);
    pLayout->addWidget(pStackedWidget,0,Qt::AlignCenter);
    pLayout->setStretchFactor(pList, 1);
    pLayout->setStretchFactor(pStackedWidget, 3);

    pWidget->setLayout(pLayout);
    w.setCentralWidget(pWidget);
    w.setWindowTitle("container test");
    w.setMinimumSize(50,50);
    w.show();
    return a.exec();
}

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