[QT] qtcreator shortcut key and QML introduction

In easy-to-use systems and professional systems , Shortcut keys are different . As a professional developer , You may Will spend a lot of time on your app , Every shortcut key can improve your work efficiency .Qt Creator So do the developers of , And many shortcut keys have been added to the application .

• Ctrl+B - Build the project
• Ctrl+R - Run the project
• Ctrl+Tab - Switch open documents
• Ctrl+k - Open locator
• Esc - return
• F2 - Find the corresponding symbol explanation .
• F4 - Switch between header file and source file （ Only right c++ Code effective ）
• F1 - View help documents

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QML grammar （QML Syntax）

QML Is a declarative language that describes the user interface . It breaks down the user interface into smaller elements , this Some elements can be combined into a component .QML Language describes the shape and behavior of user interface elements . User community Face can be used JavaScript To provide decoration , Or add more complex logic . From this point of view it follow HTML-JavaScript Pattern , but QML Is designed to describe the user interface , Not text files .

from QML The simplest way to learn is to understand the hierarchy of elements . The child element inherits the coordinates from the parent element System , its x,y The coordinate always corresponds to its parent element coordinate system .

• import Declare that a specified module version is imported . Generally speaking, it will import QtQuick2.0 As the beginning A reference to an initial element .

• Use // You can comment on a single line , Use /**/ You can comment on multiple lines , It's like C/C++ and JavaScript equally .

• every last QML All files need a root element , It's like HTML equally .

• An element uses its type declaration , And then use {} To include .

• Elements have attributes , They followed name:value The format of .

• Any in QML All elements in the document can use their id Visit （id Is an arbitrary identifier operator ）.

• Elements can be nested , This means that a parent element can have multiple child elements . Child elements can be accessed through ask parent Keyword to access their parent elements .

Suggest

You will often use id Or keywords parent To access your parent object . A better way is to name Your root element object id by root（id:root）, So you don't have to think about your QML The root element in the document How should we name it .