[Qt record] attribute Q_PROPERTY

use:

Qt has a property system. I often use in QSS

QWidget#SWNotifyMsgDialog QLabel#label_sure[status="normal"]

Use in code with

ui.label_sure->setProperty("status","warning");
函数原型：bool QObject:setProperty(const char *name,const QVariant &value)

Set the QSS style of label. The above is actually a way of using the Qt property system.

Learn more about:

However, the Qt property system can be seen from the setProperty() function, which is similar to a key-value key-value pair.
Also, setProperty() can configure property() to use. The former is to set the property, and the latter is to get the property.

ui.label_sure->property("status").toString();
函数原型：QVariant QObject::property(const char *name)const

Coding convenience can be enhanced by setting properties and getting properties.

For example: I get the current status of a control by setting the "status" property. At least one variable and two state settings are saved.

custom control

If I want to change the color and style of the blinking insertion cursor in the QLineEdit control, this setting is not supported by default, and I can only use a custom control to draw the cursor and draw it. And, I wish I could use qss styles to control.

Using the Q_PROPERTY macro, you can achieve your goal.

class CodeLineEdit : public QLineEdit
{
	QOBJECT
		QPROPERTY(QColor caretColor READ caretColor WRITE setCaretColor DESIGNABLE true)
		Q_PROPERTY(int caretwidth READ caretwidth WRITE setCaretwidth DESIGNABLE true)
}

The brackets are: type, variable name, READ, the function name to read this value (usually the variable name), WRITE, the function name to write this value (usually set+variable name). The latter can be omitted.

1. With this Q_PROPERTY macro, you can also use setProperty() to set this value.
2. Also available in the property editor in Qt Designer. Click the icon to create a dynamic attribute
   
   . The attribute name and type must be consistent with the definition.
   
   Then it will appear in the property editor.
   
   Use this, which is the same as the default property above.
   3) You can also use qproperty- in QSS to add styles.