QT6 build

[helge17]

Since QT seems to be more modern and better maintained than SWT and JFX, it might make sense to get TuxGuitar running again with QT.

First steps have already been made here:
#20
OmixVisualization/qtjambi#157

I was able to build the Hello World example of QtJambi on Debian unstable (Sid) currently shipping QT 6.6.2 with the following:

pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
		http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>hello.world</groupId>
	<artifactId>hello-world</artifactId>
	<version>0.1</version>
	<name>${project.artifactId}</name>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<!-- Installed QT version -->
		<qt-version>6.6.2</qt-version>
	</properties>


	<dependencies>
		<dependency>
			<groupId>io.qtjambi</groupId>
			<artifactId>qtjambi</artifactId>
			<version>${qt-version}</version>
		</dependency>
		<dependency>
			<groupId>io.qtjambi</groupId>
			<artifactId>qtjambi-native-linux-x64</artifactId>
			<version>${qt-version}</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.8.0</version>
				<configuration>
					<source>9</source>
					<target>9</target>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>

src/main/java/hello/world/HelloWorld.java:

import io.qt.widgets.*;
public class HelloWorld {
    public static void main(String[] args) {
        QApplication.initialize(args);
        QMessageBox.information(null, "QtJambi", "Hello World!");
        QApplication.shutdown();
    }
}

Install Maven, Java and QT6 libs:
$ sudo apt install default-jre maven libqt6core6 libqt6gui6 libqt6widgets6
Build:
$ mvn package
Run:
$ java -cp ~/.m2/repository/io/qtjambi/qtjambi/6.6.2/qtjambi-6.6.2.jar:target/hello-world-0.1.jar HelloWorld

[guiv42]

That's very good news, thanks
I'll probably re-open #20 when I find some time for this (currently low priority).

[helge17]

I just added my QT6 code to the tuxguitar-next branch:
https://github.com/helge17/tuxguitar/tree/tuxguitar-next/desktop/TuxGuitar-ui-toolkit-qt
https://github.com/helge17/tuxguitar/tree/tuxguitar-next/desktop/build-scripts/tuxguitar-linux-qt
When building, I face similar problems to those you have described here: #20 (comment):

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.10.1:compile (default-compile) on project tuxguitar-ui-toolkit-qt: Compilation failure: Compilation failure: 
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/widget/QTWidget.java:[274,29] cannot find symbol
[ERROR]   symbol:   method invokeLater(<anonymous java.lang.Runnable>)
[ERROR]   location: class io.qt.widgets.QApplication
...
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/event/QTMouseUpListenerManager.java:[20,32] constructor UIMouseEvent in class org.herac.tuxguitar.ui.event.UIMouseEvent cannot be applied to given types;
[ERROR]   required: org.herac.tuxguitar.ui.UIComponent,org.herac.tuxguitar.ui.resource.UIPosition,java.lang.Integer,java.lang.Boolean
[ERROR]   found:    org.herac.tuxguitar.ui.qt.QTComponent<capture#1 of ?>,org.herac.tuxguitar.ui.resource.UIPosition,java.lang.Integer
[ERROR]   reason: actual and formal argument lists differ in length
...
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/event/QTMouseWheelListenerManager.java:[19,91] cannot find symbol
[ERROR]   symbol:   method x()
[ERROR]   location: variable event of type io.qt.gui.QWheelEvent
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/event/QTMouseWheelListenerManager.java:[19,102] cannot find symbol
[ERROR]   symbol:   method y()
[ERROR]   location: variable event of type io.qt.gui.QWheelEvent
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/event/QTMouseWheelListenerManager.java:[19,117] cannot find symbol
[ERROR]   symbol:   method delta()
[ERROR]   location: variable event of type io.qt.gui.QWheelEvent
...
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/QTFactory.java:[98,8] org.herac.tuxguitar.ui.qt.QTFactory is not abstract and does not override abstract method createBrowser(org.herac.tuxguitar.ui.widget.UIWindow) in org.herac.tuxguitar.ui.UIFactory
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/printer/QTPrinter.java:[36,51] method pageRect in class io.qt.printsupport.QPrinter cannot be applied to given types;
[ERROR]   required: io.qt.printsupport.QPrinter.Unit
[ERROR]   found:    no arguments
[ERROR]   reason: actual and formal argument lists differ in length
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/resource/QTPainter.java:[188,55] cannot find symbol
[ERROR]   symbol:   method width(java.lang.String)
[ERROR]   location: class io.qt.gui.QFontMetrics
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/widget/QTSplashWindow.java:[50,33] cannot find symbol
[ERROR]   symbol:   method hasPendingEvents()
[ERROR]   location: class io.qt.widgets.QApplication
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/widget/QTScrollBar.java:[6,8] org.herac.tuxguitar.ui.qt.widget.QTScrollBar is not abstract and does not override abstract method getSize() in org.herac.tuxguitar.ui.widget.UIScrollBar
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/chooser/QTDirectoryChooser.java:[36,44] cannot find symbol
[ERROR]   symbol:   variable DirectoryOnly
[ERROR]   location: class io.qt.widgets.QFileDialog.FileMode
[ERROR] /home/myuser/Software/dev/desktop/TuxGuitar-ui-toolkit-qt/src/org/herac/tuxguitar/ui/qt/resource/QTMouseButton.java:[20,42] cannot find symbol
[ERROR]   symbol:   variable MidButton
[ERROR]   location: class io.qt.core.Qt.MouseButton
[ERROR] -> [Help 1]

[helge17]

After commit 3f05167 in the QT related source code, I was able to build the code on Debian 12 with QT 6.4.2.

All known open points are marked with "TODO QT 5->6", there are probably a few more.

With the following additional modification in the main source code (committing would break SWT/JFX)...

diff --git a/desktop/TuxGuitar/src/org/herac/tuxguitar/app/TuxGuitar.java b/desktop/TuxGuitar/src/org/herac/tuxguitar/app/TuxGuitar.java
index bde0babf..84e7cd87 100644
--- a/desktop/TuxGuitar/src/org/herac/tuxguitar/app/TuxGuitar.java
+++ b/desktop/TuxGuitar/src/org/herac/tuxguitar/app/TuxGuitar.java
@@ -124,14 +124,14 @@ public class TuxGuitar {
 				// display splash screen
 				TGSplash.getInstance(TuxGuitar.this.context).init();
 				
-				TGSynchronizer.getInstance(TuxGuitar.this.context).executeLater(new Runnable() {
-					public void run() {
+// TODO QT 5->6 //				TGSynchronizer.getInstance(TuxGuitar.this.context).executeLater(new Runnable() {
+// TODO QT 5->6 //					public void run() {
 						TuxGuitar.this.startUIContext(url);
 						
 						// close splash screen
-						TGSplash.getInstance(TuxGuitar.this.context).finish();
-					}
-				});
+// TODO QT 5->6 //						TGSplash.getInstance(TuxGuitar.this.context).finish();
+// TODO QT 5->6 //					}
+// TODO QT 5->6 //				});
 			}
 		});
 	}

...TuxGuitar displays the main window:

The GUI is not complete and the menu items do not respond, TuxGuitar uses 100% CPU.

The main problem is the threading. I found a very valuable hint on how to replace the missing QApplication.invokeLater in this discussion, which points to this example, but more fixes are needed.

[guiv42]

good news!
I had found alternatives to the missing methods in Qt6, unfortunately I lost my corresponding dev branch by mistake.
I'll try to have a look, but there are a bit too many open topics right now

[link4hy]

I thought QT just for C++, until I saw this post.