Multiplatform support

[Sanlorng]

Move project to kotlin multiplatform library

Based on Compose Multiplatform 1.6.2

1. move zoomable to common code
2. move sample to common code and platform spec sample(accompanist)
3. move test to common

Add desktop support

Testing

1. Desktop
   

2. Android(Robolectric)
   

[usuiat]

@Sanlorng
Thank you for your great contribution! 👏 👏
Please give me time to review it.

[usuiat]

@Sanlorng
I tried to running the sample android app on your branch, and I got the following error.

> Task :app:compileDebugKotlinAndroid FAILED
e: This version (1.3.2) of the Compose Compiler requires Kotlin version 1.7.20 but you appear to be using Kotlin version 1.9.23 which is not known to be compatible.  Please fix your configuration (or `suppressKotlinVersionCompatibilityCheck` but don't say I didn't warn you!).

I used to specify the Compose Compiler version in build.gradle as follows, but is it unnecessary with KMP?

composeOptions {
    kotlinCompilerExtensionVersion libs.versions.composeCompiler.get()
}

[Sanlorng]

@Sanlorng I tried to running the sample android app on your branch, and I got the following error.

> Task :app:compileDebugKotlinAndroid FAILED
e: This version (1.3.2) of the Compose Compiler requires Kotlin version 1.7.20 but you appear to be using Kotlin version 1.9.23 which is not known to be compatible.  Please fix your configuration (or `suppressKotlinVersionCompatibilityCheck` but don't say I didn't warn you!).

I used to specify the Compose Compiler version in build.gradle as follows, but is it unnecessary with KMP?

composeOptions {
    kotlinCompilerExtensionVersion libs.versions.composeCompiler.get()
}

composeOptions was no needed for Compose Multiplatform, Compose Multiplatform Gradle Plugin will set compose compiler automaticaly, see ComposeCompilerCompatibility.

I remove the composeOptions in the app module, please fetch and compile again.

[Sanlorng]

@Sanlorng
I tried to running the sample android app on your branch, and I got the following error.

> Task :app:compileDebugKotlinAndroid FAILED
e: This version (1.3.2) of the Compose Compiler requires Kotlin version 1.7.20 but you appear to be using Kotlin version 1.9.23 which is not known to be compatible.  Please fix your configuration (or `suppressKotlinVersionCompatibilityCheck` but don't say I didn't warn you!).

I used to specify the Compose Compiler version in build.gradle as follows, but is it unnecessary with KMP?

composeOptions {
    kotlinCompilerExtensionVersion libs.versions.composeCompiler.get()
}

The compile error was fixed，you can fetch the branch and compile again.

[usuiat]

@Sanlorng
Thanks. Now I can run the android sample app.

In addition, could you tell me how to run the desktop sample app?
I'm a beginner of the compose multiplatform.

[usuiat]

@Sanlorng
The following commands could be used. Is this correct?

./gradlew :app:run

[usuiat]

@Sanlorng
I ran the desktop sample app on Windows to see how it worked on a multi-touch enabled display.
However, the pinch gestures did not work. Tap and double-tap worked.
Do the gestures work in your environment? If they are working, can you tell me your environment?

[Sanlorng]

@Sanlorng
I ran the desktop sample app on Windows to see how it worked on a multi-touch enabled display.
However, the pinch gestures did not work. Tap and double-tap worked.
Do the gestures work in your environment? If they are working, can you tell me your environment?

I need find a Windows Pad to test it.

[Sanlorng]

@Sanlorng
Thanks. Now I can run the android sample app.

In addition, could you tell me how to run the desktop sample app?
I'm a beginner of the compose multiplatform.

，The simple way is clicking the run button in the left of fun main()

[Sanlorng]

@Sanlorng I ran the desktop sample app on Windows to see how it worked on a multi-touch enabled display. However, the pinch gestures did not work. Tap and double-tap worked. Do the gestures work in your environment? If they are working, can you tell me your environment?

I've tried it in the RDP with Touch mode, it doesn't works. and then i search keyword touch/pinch/zoom at the Compose Multiplatform Repository Issues , Multi-finger touch doesn't seem to be supported on desktop platforms yet, see
JetBrains/compose-multiplatform#2209
JetBrains/compose-multiplatform#1555

[usuiat]

Thanks for doing the research for the Issue.
I see that Compose for desktop does not officially support multi-touch.

By the way, the gestures were working in your environment when you created this Pull Request, correct?
What environment did you check?

[Sanlorng]

Thanks for doing the research for the Issue.
I see that Compose for desktop does not officially support multi-touch.

By the way, the gestures were working in your environment when you created this Pull Request, correct?
What environment did you check?

I test it on Android And Windows with Mouse，the pinch gesture in the Windows was not tested at the time，because I only had mouse mode at the time.

I think input in the UI test framework can be responded to correctly and the correct test passes, which means that the code is correct on the target platform of the test. The remaining problem is that the framework cannot emit correct touch events, which should not be Obstacles to supporting target platforms.

At the same time, the project also provides a double-click zoom gesture, which can be supported on the desktop.

So I think we can make it clear in the support section on which platforms certain gestures are not available and why.

In addition, I think we can consider supporting the scroll wheel to adjust the zoom ratio in zoom mode, and hold down the ctrl key and scroll wheel to open zoom when the focus is on the zoom control, which helps better support mouse users.

[usuiat]

I agree with you.
I think it would be better to merge this pull request, and release the desktop version as experimental.

Again, I am new to KMP, so I am reviewing your pull request as I learn. It will take some time.
Thank you.

[usuiat]

@Sanlorng
Sorry it took so long.
I added some comments.

[usuiat]

@Sanlorng
Thank you for your quick response.

I added one more question.
Could you confirm?