/** 处理者Map. */
private Map<String, IHandlerActivation> handlerMap = new HashMap<String, IHandlerActivation>();

/**
 * 激活动作处理者.
 * 
 * @param commandId
 *            命令ID
 * @param handler
 *            动作处理者
 */
public void activateHandler(String commandId, ActionHandler handler) {

    if (handlerMap.containsKey(commandId)) {
        return;
    }

    // 取得Handler服务
    IHandlerService handlerService = (IHandlerService) editor.getSite()
            .getService(IHandlerService.class);

    // 激活handler
    IHandlerActivation activation = handlerService.activateHandler(
            commandId, handler);

    // 保存到Map，以便之后使用
    handlerMap.put(commandId, activation);
}

/**
 * 停用动作处理者.
 * 
 * @param commandId
 *            命令ID
 */
public void deactivateHandler(String commandId) {

    if (!handlerMap.containsKey(commandId)) {
        return;
    }

    // 取得Handler服务
    IHandlerService handlerService = (IHandlerService) editor.getSite()
            .getService(IHandlerService.class);

    // 停用handler
    IHandlerActivation activation = handlerMap.get(commandId);
    handlerService.deactivateHandler(activation);

    // 从Map中移除
    handlerMap.remove(commandId);
}

/**
 * 设置“剪切”快捷键是否可用.
 * 
 * @param enabled
 *            是否可用
 */
public void setCutEnabled(boolean enabled) {
    if (enabled) {
        activateHandler(IWorkbenchCommandConstants.EDIT_CUT,
                new ActionHandler(cutAction));
    } else {
        deactivateHandler(IWorkbenchCommandConstants.EDIT_CUT);
    }
}

/**
 * 设置“复制”快捷键是否可用.
 * 
 * @param enabled
 *            是否可用
 */
public void setCopyEnabled(boolean enabled) {
    if (enabled) {
        activateHandler(IWorkbenchCommandConstants.EDIT_COPY,
                new ActionHandler(copyAction));
    } else {
        deactivateHandler(IWorkbenchCommandConstants.EDIT_COPY);
    }
}

/**
 * 设置“粘贴”快捷键是否可用.
 * 
 * @param enabled
 *            是否可用
 */
public void setPasteEnabled(boolean enabled) {
    if (enabled) {
        activateHandler(IWorkbenchCommandConstants.EDIT_PASTE,
                new ActionHandler(pasteAction));
    } else {
        deactivateHandler(IWorkbenchCommandConstants.EDIT_PASTE);
    }
}

/**
 * 设置“删除”快捷键是否可用.
 * 
 * @param enabled
 *            是否可用
 */
public void setDeleteEnabled(boolean enabled) {
    if (enabled) {
        activateHandler(IWorkbenchCommandConstants.EDIT_DELETE,
                new ActionHandler(deleteAction));
    } else {
        deactivateHandler(IWorkbenchCommandConstants.EDIT_DELETE);
    }
}

/**
 * 设置“全选”快捷键是否可用.
 * 
 * @param enabled
 *            是否可用
 */
public void setSelectAllEnabled(boolean enabled) {
    if (enabled) {
        activateHandler(IWorkbenchCommandConstants.EDIT_SELECT_ALL,
                new ActionHandler(selectAllAction));
    } else {
        deactivateHandler(IWorkbenchCommandConstants.EDIT_SELECT_ALL);
    }
}