Custom type with properties like QML color

SeeLook

Hi all,

I can register custom type (not QObject derivative) and with QGadget & Q_INVOKABLE macro get access to its functions,
but
is there any way to have similar functionality like QML color, to have property-like access:

property color someColor: "red"
// then we have access to its "props" like:
someColor.r // red component
someCalor.a // alpha

Is it possible for custom type which has to be light like in this example QColor/QML color is?

? Offline

Hi! Yes that's possible:

class Pet
{
    Q_GADGET
    Q_PROPERTY(QString name READ name WRITE setName)
    Q_PROPERTY(int age READ age WRITE setAge)
    
public:
    QString name() const { return m_name; }
    void setName(const QString &name) { m_name = name; }

    int age() const { return m_age; }
    void setAge(int age) { m_age = age; }

private:
    QString m_name;
    int m_age = 0;
}

Q_DECLARE_METATYPE(Pet)

SeeLook

@Wieland Thanks a million.

SeeLook

By the way,
Is there any difference for such a case

//cpp
Q_PROPERTY(QString name READ name WRITE setName)
QString name() const { return m_name; }
void setName(const QString &name) { m_name = name; }
//QML
property Pet pet
pet.name

or

//cpp
Q_INVOKABLE QString name() const { return m_name; }
//QML
property Pet pet
pet.name()

I mean speed or memory consumption, which one is more preferable?

? Offline

@SeeLook said in Custom type with properties like QML color:

Q_INVOKABLE

It's both correct and useful code. The only difference is that if you add Q_INVOKABLE then that function is also registered to the meta object system / can also be called from QML. Speed: don't know, sry.

patrik08

Long time a go i register all standard xsl:fo color same color from openoffice or apache fop xml https://xmlgraphics.apache.org/fop/0.95/extensions.html

i register as FopColor:FopColor

record("black" 	,QColor( 0, 0, 0,255));
	record("blanchedalmond"	,QColor(255, 235, 205,255));
	record("blue"	,QColor( 0, 0, 255,255));
	record("blueviolet" 	,QColor(138, 43, 226,255));
	record("brown"	,QColor(165, 42, 42,255));
	record("burlywood"	,QColor(222, 184, 135,255));
	record("cadetblue"	,QColor( 95, 158, 160,255));
	record("chartreuse"	,QColor(127, 255, 0,255));
	record("chocolate"	,QColor(210, 105, 30,255));
	record("coral" 	,QColor(255, 127, 80,255));
	record("cornflowerblue"	,QColor(100, 149, 237,255));
	record("cornsilk" 	,QColor(255, 248, 220,255));
	record("crimson"	,QColor(220, 20, 60,255));
	record("cyan"	,QColor( 0, 255, 255,255));
       and many moore...

read:
https://github.com/pehohlva/DocSpeacker/blob/master/3rdparty/oldtimer/FoColorName.cpp
https://github.com/pehohlva/DocSpeacker/blob/master/3rdparty/oldtimer/FoColorName.h

all this color you find inside openoffice libreoffice format to read odt file ... qt can write odt file (but not read) i suppose now in qt5 have moore specification...
inside Okular source you find out the same color specification.. the list is very long...

SeeLook

Thank You for the answers.
It clarified steps to take in my code.