C++ (Cpp) ToolManager::selectedTool示例

DocumentManager::DocumentManager(QObject *parent)
    : QObject(parent)
    , mTabWidget(new QTabWidget)
    , mUndoGroup(new QUndoGroup(this))
    , mSelectedTool(0)
    , mSceneWithTool(0)
{
    mTabWidget->setDocumentMode(true);
    mTabWidget->setTabsClosable(true);

    connect(mTabWidget, SIGNAL(currentChanged(int)),
            SLOT(currentIndexChanged()));
    connect(mTabWidget, SIGNAL(tabCloseRequested(int)),
            SIGNAL(documentCloseRequested(int)));

    ToolManager *toolManager = ToolManager::instance();
    setSelectedTool(toolManager->selectedTool());
    connect(toolManager, SIGNAL(selectedToolChanged(AbstractTool*)),
            SLOT(setSelectedTool(AbstractTool*)));
}