Migrate Qt5 to Qt6

[mjcarroll]

Tracking issue for tasks required to migrate from Qt5 to Qt6.

• [ ] CMake Updates
• [ ] Update MinimalScene for new APIs getting native access to VkImage and Metal equivalent.
• [ ] QtGraphicalEffects is deprecated and has some incompatibilities: https://doc.qt.io/qt-6/qtgraphicaleffects5-index.html
• [ ] QRegExp is deprecated: https://doc.qt.io/qt-6/qregexp.html

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Environment: Ubuntu Noble + Gazebo Ionic + Qt6 + https://github.com/gazebosim/gz-gui/pull/596/ + https://github.com/gazebosim/gz-sim/pull/2305/ Initial test: gz sim minimal_scene.sdf

Goals

1. Make Gz Ionic work with Qt5/Qt6
2. Backport Qt5 changes to Harmonic

Tasks

• [ ] Update our gz gui CI action to use Ubuntu Noble.
• [ ] Forward port gz-qui8 to main.

Ideas

• [ ] Load our qml codebase into Qt Creator / GammaRay to detect issues.

Current list of issues:

• [ ] GzSpinBox. Replace it with a textbox widget.
• [ ] TreeViewStyle not available in Qt6 qml .
• [ ] Review if QtQuick.Controls 1.x is used and identify the replacement if any.
• [x] [GUI] [Err] [Gui.cc:326] Failed to instantiate custom drawer, drawer will be empty.
• [x] (fixed) Confirm if there's a segfault when running gz sim shapes.sdf or gz sim minimal_scene.sdf.
• [ ] Propagate the changes made in gz-gui to compile plugins as modules.
• [ ] 3D scene window not working. Minimal example to load a 3D scene: * https://doc.qt.io/qt-6/debug.html * There's a useful example in gz-rendering: examples/simple_demo_qml . * 1st test: Load MinimalScene only and create a <scene> element within <world> to change the background color. * 2nd test: Create an SDF with MinimalScene (gz-gui) and SceneManager (gz-sim).

[mjcarroll]

Compatible changes between qt5+qt6: https://github.com/gazebosim/gz-gui/pull/598

[mjcarroll]

Clazy checks: https://github.com/gazebosim/gz-gui/pull/584

[mjcarroll]

Bulk of the migrations for gui: https://github.com/gazebosim/gz-gui/pull/596

[azeey]

Here's the list of qt6 packages I needed to install:

• qml6-module-qt-labs-folderlistmodel
• qml6-module-qt-labs-platform
• qml6-module-qt-labs-settings
• qml6-module-qtcharts
• qml6-module-qtpositioning
• qml6-module-qtqml-models
• qml6-module-qtquick-controls
• qml6-module-qtquick-dialogs
• qml6-module-qtquick-layouts
• qml6-module-qtquick-templates
• qml6-module-qtquick-window
• qml6-module-qtquick
• qt6-base-dev
• qt6-declarative-dev
• libqt6quickcontrols2-6
• qml6-module-qtcore
• qml6-module-qtqml-workerscript
• qml6-module-qt5compat-graphicaleffects
• libqt6svg6

[azeey]

I've added a fix in the gz-sim branch https://github.com/gazebosim/gz-sim/pull/2305/commits/a2652ac19b906587f441c40f29c886ceda7dd0d3 which should help with the communication between the server and GUI ECMs. With that, I see glimmers of hope :) Screen recording 2024-07-16 14.18.43.webm

[caguero]

I was able to visualize the 3D screen even without your changes. It was hidden at the very left covered by other collapsed window plugins.