[Interest] Use Book and Medium weight Gotham font from QML?

[Elvis Stansvik]

Hi all,

I'm targeting Qt 5.4.1 and it seems there's no Font.Medium enumeration
value there? I get:

    Unable to assign [undefined] to int

The font we're using for this app is our company font, which is Gotham
from Hoefler & Co. The weights we need in the UI are Book and Medium,
each defined in its own .otf (but under the same family name
"Gotham"), as shown by the fc-scan output below:

estan at newton:~$ fc-scan Gotham-Book.otf
Pattern has 22 elts (size 32)
        family: "Gotham"(s) "Gotham Book"(s)
        familylang: "en"(s) "en"(s)
        style: "Book"(s) "Regular"(s)
        stylelang: "en"(s) "en"(s)
        fullname: "Gotham-Book"(s)
        fullnamelang: "en"(s)
        slant: 0(i)(s)
        weight: 50(i)(s)
        width: 100(i)(s)
        foundry: "unknown"(s)
        file: "Gotham-Book.otf"(s)
        index: 0(i)(s)
        outline: True(s)
        scalable: True(s)
        charset:
        0000: 00000000 ffffffff ffffffff 7fffffff 00000000 ffdfcfaf
ffffffff ffffffff
        0001: cffffcff fec3fccf cffff1ff 7ffffc3f 00040000 00000000
00000000 fc000000
        0002: 03000000 00000000 02000000 00000000 00000000 00000000
3f0000c0 00000000
        0003: 00000000 00000040 00000000 00000000 00000000 00000000
00000000 00000000
        000e: 00000000 80000000 00000000 00000000 00000000 00000000
00000000 00000000
        001e: 00000000 00000000 00000000 00000000 0000003f 00000000
00000000 000c0000
        0020: 771806bc 06010047 00000010 03f10000 000003ff 00021742
00000000 00000000
        0021: 00800000 00000005 7ff80000 00000000 00000000 00000000
00000000 00000000
        0022: 00040000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
        00fb: 0000001f 00000000 00000000 00000000 00000000 00000000
00000000 00000000
(s)
        lang: aa|ay|bi|br|bs|ca|ch|co|cs|cy|da|de|en|es|et|eu|fi|fj|fo|fr|fur|fy|gd|gl|gv|ho|hr|hu|ia|id|ie|io|is|it|la|lb|lt|lv|mg|mh|mt|nb|nds|nl|nn|no|nr|nso|ny|oc|om|pl|pt|rm|sk|sl|sma|smj|so|sq|ss|st|sv|sw|tk|tl|tn|tr|ts|uz|vo|vot|wa|wen|xh|yap|zu|an|crh|csb|fil|hsb|ht|jv|kj|ku-tr|kwm|li|ms|ng|pap-an|pap-aw|rn|rw|sc|sg|sn|su|za(s)
        fontversion: 144179(i)(s)
        capability: "otlayout:     otlayout:latn"(s)
        fontformat: "CFF"(s)
        decorative: False(s)
        hash: "sha256:3083f405cb35b16e06d0108836dd6552630c85c7fc5412a5de724e57e6fd7348"(s)
        postscriptname: "Gotham-Book"(s)

estan at newton:~$ fc-scan Gotham-Medium.otf
Pattern has 22 elts (size 32)
        family: "Gotham"(s) "Gotham Medium"(s)
        familylang: "en"(s) "en"(s)
        style: "Medium"(s) "Regular"(s)
        stylelang: "en"(s) "en"(s)
        fullname: "Gotham-Medium"(s)
        fullnamelang: "en"(s)
        slant: 0(i)(s)
        weight: 80(i)(s)
        width: 100(i)(s)
        foundry: "unknown"(s)
        file: "Gotham-Medium.otf"(s)
        index: 0(i)(s)
        outline: True(s)
        scalable: True(s)
        charset:
        0000: 00000000 ffffffff ffffffff 7fffffff 00000000 ffdfcfaf
ffffffff ffffffff
        0001: cffffcff fec3fccf cffff1ff 7ffffc3f 00040000 00000000
00000000 fc000000
        0002: 03000000 00000000 02000000 00000000 00000000 00000000
3f0000c0 00000000
        0003: 00000000 00000040 00000000 00000000 00000000 00000000
00000000 00000000
        000e: 00000000 80000000 00000000 00000000 00000000 00000000
00000000 00000000
        001e: 00000000 00000000 00000000 00000000 0000003f 00000000
00000000 000c0000
        0020: 771806bc 06010047 00000010 03f10000 000003ff 00021742
00000000 00000000
        0021: 00800000 00000005 7ff80000 00000000 00000000 00000000
00000000 00000000
        0022: 00040000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
        00fb: 0000001f 00000000 00000000 00000000 00000000 00000000
00000000 00000000
(s)
        lang: aa|ay|bi|br|bs|ca|ch|co|cs|cy|da|de|en|es|et|eu|fi|fj|fo|fr|fur|fy|gd|gl|gv|ho|hr|hu|ia|id|ie|io|is|it|la|lb|lt|lv|mg|mh|mt|nb|nds|nl|nn|no|nr|nso|ny|oc|om|pl|pt|rm|sk|sl|sma|smj|so|sq|ss|st|sv|sw|tk|tl|tn|tr|ts|uz|vo|vot|wa|wen|xh|yap|zu|an|crh|csb|fil|hsb|ht|jv|kj|ku-tr|kwm|li|ms|ng|pap-an|pap-aw|rn|rw|sc|sg|sn|su|za(s)
        fontversion: 144179(i)(s)
        capability: "otlayout:     otlayout:latn"(s)
        fontformat: "CFF"(s)
        decorative: False(s)
        hash: "sha256:bc397773a547218b8c334f9a40ea8e58f55198fab6095b103e598634fe273450"(s)
        postscriptname: "Gotham-Medium"(s)

estan at newton:~/orexplore/doc/GrafiskProfil/Typsnitt/Gotham$

And I'm loading these as follows:

Style {
    readonly property string mediumFontFamily: __gothamMediumLoader.name
    readonly property string regularFontFamily: __gothamBookLoader.name

    property FontLoader __gothamBookLoader: FontLoader {
        source: "fonts/Gotham-Book.otf"
    }

    property FontLoader __gothamMediumLoader: FontLoader {
        source: "fonts/Gotham-Medium.otf"
    }

    ...
}

and trying to use them with:

Text {
    text: "Foo"
    font.family: Style.regularFontFamily
    font.weight: Font.Normal
}

Text {
    text: "Foo"
    font.family: Style.mediumFontFamily
    font.weight: Font.Medium
}

the Font.Normal seems to work okay, it looks like it's giving me the
Book weight from Gotham-Book.otf, which I want. I guess because the
weight is close numerically (?)

But what do I do with the Medium weight since the enum value is not
available? If I try Font.Bold I seem to get synthetic emboldening,
which I don't want.

It seems there's some fixes in 5.6 which will let me use
Font.styleName to match a font by style name, which would be a
workaround [1]. But right now I'm stuck with 5.4.1.

Thanks in advance for any advice.

Elvis

[1] https://codereview.qt-project.org/#/c/112676/