工具箱有两种实现方式，一是运用工具栏QToolBar，二是运用QButtonGroup，在按钮组内创建多个QPushButton，每个按钮对应不同的槽函数。

本节的“工具箱”窗口是QDockWidget类型，通过在停靠窗口上添加控件来实现工具箱功能。

代码

在头文件中添加

private:
    int drawType;                               // 绘制类型
    QButtonGroup *toolButtonGroup;              // 按钮组
    void ToolWin();                             // 工具箱窗口

private slots :
    void toolButtonClicked(int id);             // 绘图槽函数ButtonGroup

在CPP文件的构造函数中添加

mainWindow::mainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);   
    ......
    ToolWin();      // 工具箱窗口
}

void mainWindow::ToolWin()                              // 工具箱窗口
{
    //dock_Tool = new QDockWidget(tr("工具箱"), this);             // 工具栏
    //dock_Tool->setFeatures(QDockWidget::DockWidgetClosable);

    QPushButton *button_pen = new QPushButton(QIcon("../Image/toolbox/Painbrush.png"), tr(""), this);
    button_pen->setFixedSize(35, 35);
    button_pen->setToolTip(tr("钢笔"));
    button_pen->setObjectName("customButton");
    QPushButton *button_line = new QPushButton(QIcon("../Image/toolbox/Line.png"), tr(""), this);
    button_line->setFixedSize(35, 35);
    button_line->setToolTip(tr("线条"));
    button_line->setObjectName("customButton");
    QPushButton *button_circle = new QPushButton(QIcon("../Image/toolbox/Circle.png"), tr(""), this);
    button_circle->setFixedSize(35, 35);
    button_circle->setToolTip(tr("圆形"));
    button_circle->setObjectName("customButton");
    QPushButton *button_ellipse = new QPushButton(QIcon("../Image/toolbox/Elipse.png"), tr(""), this);
    button_ellipse->setFixedSize(35, 35);
    button_ellipse->setToolTip(tr("椭圆"));
    button_ellipse->setObjectName("customButton");
    QPushButton *button_triangle = new QPushButton(QIcon("../Image/toolbox/Triangle.png"), tr(""), this);
    button_triangle->setFixedSize(35, 35);
    button_triangle->setToolTip(tr("三角形"));
    button_triangle->setObjectName("customButton");
    QPushButton *button_rhombus = new QPushButton(QIcon("../Image/toolbox/Rhombus.png"), tr(""), this);
    button_rhombus->setFixedSize(35, 35);
    button_rhombus->setToolTip(tr("菱形"));
    button_rhombus->setObjectName("customButton");
    QPushButton *button_rect = new QPushButton(QIcon("../Image/toolbox/Rectangle.png"), tr(""), this);
    button_rect->setFixedSize(35, 35);
    button_rect->setToolTip(tr("长方形"));
    button_rect->setObjectName("customButton");
    QPushButton *button_square = new QPushButton(QIcon("../Image/toolbox/Square.png"), tr(""), this);
    button_square->setFixedSize(35, 35);
    button_square->setToolTip(tr("正方形"));
    button_square->setObjectName("customButton");
    QPushButton *button_hexagon = new QPushButton(QIcon("../Image/toolbox/Hexagon.png"), tr(""), this);
    button_hexagon->setFixedSize(35, 35);
    button_hexagon->setToolTip(tr("六边形"));
    button_hexagon->setObjectName("customButton");

    QGridLayout *toolLayout = new QGridLayout();
    toolLayout->setAlignment(Qt::AlignTop);
    toolLayout->addWidget(button_pen, 0, 0);
    toolLayout->addWidget(button_line, 0, 1);
    toolLayout->addWidget(button_ellipse, 1, 1);
    toolLayout->addWidget(button_circle, 1, 0);
    toolLayout->addWidget(button_triangle, 2, 0);
    toolLayout->addWidget(button_rhombus, 2, 1);
    toolLayout->addWidget(button_rect, 3, 0);
    toolLayout->addWidget(button_square, 3, 1);
    toolLayout->addWidget(button_hexagon, 4, 0);

    QWidget *toolWidget = new QWidget(dock_Tool);
    toolWidget->setLayout(toolLayout);
    dock_Tool->setWidget(toolWidget);

    // 按钮组 QButtonGroup
    toolButtonGroup = new QButtonGroup();
    toolButtonGroup->addButton(button_pen, 1);              // 自动分配的id为复数，从-2开始，
    toolButtonGroup->addButton(button_line, 2);             // 最好自己指定id，使用正数以避免冲突。
    toolButtonGroup->addButton(button_ellipse, 3);
    toolButtonGroup->addButton(button_circle, 4);
    toolButtonGroup->addButton(button_triangle, 5);
    toolButtonGroup->addButton(button_rhombus, 6);
    toolButtonGroup->addButton(button_rect, 7);
    toolButtonGroup->addButton(button_square, 8);
    toolButtonGroup->addButton(button_hexagon, 9);
    connect(toolButtonGroup, SIGNAL(buttonClicked(int)), this, SLOT(toolButtonClicked(int)));       // 按钮组的槽函数
}

// 绘图槽函数ButtonGroup
void mainWindow::toolButtonClicked(int id)  
{
    QList<QAbstractButton *> buttons = toolButtonGroup->buttons();
    foreach(QAbstractButton *button, buttons)
    {
        if (toolButtonGroup->button(id) != button)  // 按钮组内其它按钮设置为不可用
            button->setChecked(false);
        else if (drawType == id)                    // 如果绘制类型与前次相同，则退出绘制模式
            drawType = 0;
        else
            drawType = id;
    }

    switch (drawType)
    {
    case 0:
        QMessageBox::information(this, tr("绘制"), tr("退出绘制模式！"));    // 后续将改为绘制功能函数
        break;              
    case 1:
        QMessageBox::information(this, tr("绘制"), tr("钢笔！"));    break;
    case 2:
        QMessageBox::information(this, tr("绘制"), tr("线条！"));    break;
    case 3:
        QMessageBox::information(this, tr("绘制"), tr("椭圆形！"));   break;
    case 4:
        QMessageBox::information(this, tr("绘制"), tr("圆形！"));    break;
    case 5:
        QMessageBox::information(this, tr("绘制"), tr("三角形！"));   break;
    case 6:
        QMessageBox::information(this, tr("绘制"), tr("菱形！"));    break;
    case 7:
        QMessageBox::information(this, tr("绘制"), tr("长方形！"));   break;
    case 8:
        QMessageBox::information(this, tr("绘制"), tr("正方形！"));   break;
    case 9:
        QMessageBox::information(this, tr("绘制"), tr("六边形！"));   break;
    default:
        break;
    }
}