UI Only Custom Datadir

[D33r-Gee]

This pull request is a focused iteration of #390, intended to isolate and test the UI frontend elements. Backend functionality has been intentionally excluded to streamline the testing, review, and merge process.

Ubuntu Screenshots

  

Prerequisites

For testing this pull request, ensure you have the following Qt modules installed:

• On Ubuntu 22.04:

sudo apt-get install qtdeclarative5-dev
sudo apt-get install qtquickcontrols2-5-dev
sudo apt-get install qml-module-qtquick-controls2
sudo apt install qml-module-qtquick-dialogs

• For Android:
  • Make sure you delete the prior depends folder (i.e. depends/aarch64-linux-android) and rebuild them.

Implementation Details

This introduces FileDialog class for a user-friendly selection experience.

• QML Backend
  • Updated options_model files to account for custom data directory configuration and placeholders for custom datadir wiring.
  • Added @johnny9 depends patches to allow static building
• QML Frontend
  • Updated StorageLocations.qml to allow for custom data directory selection.

Follow up PR will add display of the custom datadir in StorageSettings.qml

[D33r-Gee]

Update the README at https://github.com/bitcoin-core/gui-qml/tree/main/src/qml with the additional packages that need to be installed.

Good call @johnny9! Just pushed a new commit with the updated doc.

Now it's pretty much equivalent (give and take) with @jarolrod's #273

[D33r-Gee]

double-clicking on Custom opens the storage selection in the background. single-click works ok

Thanks @MarnixCroes, good catch... wasn't able to reproduce on WSL Ubuntu 22.04... Found a potential workaround by adding a timer, will implemented in a future PR since it's little out of scope for this one.

649c2a5 you added qml-module-qtquick-dialogs, the other 3 qtdeclarative5-dev qtquickcontrols2-5-dev qml-module-qtquick-controls2 should be added to the instructions as well?

those are actually found here in the qml/README.md: https://github.com/bitcoin-core/gui-qml/blob/649c2a5af80092e4f43497309aafe5785a2b2bdd/src/qml/README.md?plain=1#L66 and here: https://github.com/bitcoin-core/gui-qml/blob/649c2a5af80092e4f43497309aafe5785a2b2bdd/src/qml/README.md?plain=1#L73

[GBKS]

Already merged, but I just tested on Android and MacOS and the UI works fine. Nice work on this, sounds like file picking was quite the heavy lift to get done.

I agree with the UI proposals up there and will prep respective designs.

[GBKS]

I created a follow-up issue for the directory display in storage settings here. Would be great to get your input on the question I have in that issue.