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On the right side of the form in Figure 1 is a QCalendarWidget component, which displays dates in the form of a calendar and can be used for date selection. QCalendarWidget has a signal selectionChanged (), which is transmitted after the date selected on the calendar changes. Create a slot function for this signal and write the following code:In terms of product development, Osaka Weaving House has also gone through detours. For example, at first I made Japanese-style lace bras with steel rings, but I failed because more and more young women wanted to get rid of the shackles. Later, Osaka Weaving House only made bras without traces and rims.　黑日组织在国际股市移走了500亿美元资金，企图用这笔资金进行恐怖活动经费并且栽赃中国。神鹰反恐特战队将计就计，启动R4行动。在杨灿、那敏、柳诗文等潜伏人员和厉剑锋带领的特战队员的完美配合下，粉碎了敌人。一个从阿富汗战争中归来的士兵，揭发了一个阴谋的情报服务和一个贩毒团伙一边对黄豆露出个和善的笑容。Copyright Statement: For articles recommended by the Industrial Intelligence Officer (Public ID: AI-CPS), unless it is really impossible to confirm, we will indicate the author and source. Some articles failed to get in touch with the original author when they were pushed. If copyright issues are involved, please contact us with the original author and negotiate with you. Contact, submission email: erp_vip@hotmail.comEach object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.