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catalogue 1, Realization effect 2, Brief introduction to elements, views and scenes 1. Interrelationship 2. Header file          3. Implementation process 3, Code implementation 1. Customize an Item (element) 1.1. Create a new class myItem, which inherits from QGraphicsItem 1.2. myItem header file (. h) 1.3 overloaded constructor 1.4 ...

Preface: the project has been packaged with webpack, and has systematically followed the video tutorial of station B, but I always feel that there is something wrong. Some configurations are still unknown. I decided to write down some examples, summarize the knowledge points, and learn webpack 5 by the way. webpack actual combat series column ...

The built-in component checkbox is required for the uni app form multi selector. See the link on the official website for details, as follows: Checkbox - uni app official website (dcloud.io) The official default style of h5 terminal is as follows: ​ Now you need to change the style to this: ​ So we began to modify: <checkbox-group @ch ...

Hello, I'm architecture Jun, an architect who can write code and recite poetry. Today, let's talk about InstanceKlass "suggestions collection" of HotSpot class model. I hope it can help you make progress!!!Last HotSpot source code analysis and other models This paper introduces the important properties and methods of the basic class K ...

Hello, I'm architecture Jun, an architect who can write code and recite poetry. Today, let's talk about [GC analysis] Java GC log to view the "suggestions collection". I hope it can help you make progress!!!What are the types of GC in Java?parameterdescribeUseSerialGCThe virtual machine runs in the default value of Client mode. After ...

JavaWeb (crazy God says Java) Java Web 1. Basic concepts 1.1 Preface web development: Web is the meaning of web page development, which means that we can get resources from the web page www.baidu.com com Static web html css The data provided to everyone will never change Dynamic web Taobao, almost all websites are dynamic ...

Occurrence and avoidance of deadlock and livelock When multithreading programming involves reading and writing shared data at the same time, you should be extra careful. If the shared data is an exclusive resource, the simplest way to have exclusive access to the read and write of the shared data is to lock it. The lock cannot be used casua ...

Table of Contentsbackground knowledgeArchitectural Evolution in the Big Data AgeRocketMQ Connector&StreamApache HudiBuilding Lakehouse PracticesThe title of this article contains three keywords: Lakehouse, RocketMQ, Hudi. We start with the overall Lakehouse architecture, and then step by step analyze the causes of the architecture, the char ...

With CameraX for video recording, the steps to initialize the camera are much the same as when taking pictures, except that the video capturer VideoCapture is added. There are three main areas of code that need to be modified, described below. The first place is in AndroidManifest. The XML is supplemented with the declaration of recording right ...

Tip: after the article is written, the directory can be generated automatically. Please refer to the help document on the right for how to generate it Chapter VIII file operation (IO Technology) Both the program and the stored data are complete; The program data we wrote earlier is not actually stored, so the data disappears after the p ...