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Allow using QGuiApplication and not linking to QtWidgets #211

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AdrianEddy
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This PR adds a new feature flag that allows to skip linking the QtWidgets module and use QGuiApplication instead of QApplication. I added it as an optional feature that disables the linking to not break any existing code and feature set that users may already have.

@@ -31,6 +31,8 @@ qtmultimediawidgets = []
qtsql = []
# Link against QtTest
qttest = []
# Don't link QtWidgets and use QGuiApplication
nowidgets = []
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In Rust, features need to be additive.
So this should be a qtwidget feature and enable it by default.

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@AdrianEddy AdrianEddy Nov 15, 2021

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But then what about users who already have no-default-features enabled? It would break the build for them

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Right.
I suppose we will have to increase the semver then.

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Something like rust-lang/rfcs#3146 would be nice.

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@ogoffart ogoffart left a comment

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Thanks, the change starts to look good.

Since this require a semver version change. I'm wondering about merging this now or waiting a bit to see if there are other needed breaking changes. How much do you require this change?

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@AdrianEddy
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Since this require a semver version change. I'm wondering about merging this now or waiting a bit to see if there are other needed breaking changes. How much do you require this change?

It's not super important, it'll be just nice to save some space by not having to deploy QtWidgets module when it's not used. It can wait, it's not a blocker for me

chrono_qdatetime = ["qttypes/chrono"]
webengine = ["qttypes/qtwebengine"]
widgets = ["qttypes/qtwidgets"]

[dependencies]
qttypes = { path = "../qttypes", version = "0.2.5", features = ["qtquick"] }

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Suggested change
qttypes = { path = "../qttypes", version = "0.2.5", features = ["qtquick"] }
qttypes = { path = "../qttypes", version = "0.2.5", default-features = false, features = ["required", "qtquick"] }

This PR is extremely helpful for me: I'm creating an app for the reMarkable e-ink tablet, which only supports QtQuick. However, qttypes still tries to link to QtWidgets with its default features, which causes an error for me because it doesn't exist.

… as supported, but it's required on Android so add it explicitly
…detected as supported, but it's required on Android so add it explicitly"

This reverts commit e359084.
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Maybe it's soon time to make a breaking change release so we can merge this.

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3 participants