FlatDesktopPropertiesDump tool added

developed to find out whether it is possible to detect Windows screen scaling and text scaling factors in Java 8, which seems to be possible by using "win.defaultGUI.font" desktop property issue #175
2026-02-11 22:47:13 -06:00 · 2020-09-18 14:24:30 +02:00
parent 4487c9985c
commit 932ca6f9d4
33 changed files with 3953 additions and 0 deletions
--- a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatDesktopPropertiesDump.java
+++ b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatDesktopPropertiesDump.java
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.testing;
+
+import java.awt.Font;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsEnvironment;
+import java.awt.Toolkit;
+import java.io.File;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.util.Locale;
+import javax.swing.SwingUtilities;
+
+/**
+ * Dumps desktop properties.
+ *
+ * @author Karl Tauber
+ */
+public class FlatDesktopPropertiesDump
+{
+	public static void main( String[] args ) {
+		System.setProperty( "line.separator", "\n" );
+
+		SwingUtilities.invokeLater( () -> {
+			printDesktopProperties();
+		} );
+	}
+
+	private static void printDesktopProperties() {
+		Toolkit toolkit = Toolkit.getDefaultToolkit();
+		String osName = System.getProperty( "os.name" ).toLowerCase( Locale.ENGLISH );
+
+		// Java scale factor
+		GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment()
+			.getDefaultScreenDevice().getDefaultConfiguration();
+		double javaScale = gc.getDefaultTransform().getScaleX();
+		float fontScale;
+
+		double screenScale = javaScale;
+		float textScale = 1;
+
+		if( osName.startsWith( "windows" ) ) {
+			// text scale factor
+			Font winFont = (Font) toolkit.getDesktopProperty( "win.messagebox.font" );
+			fontScale = roundToQuater( winFont.getSize() / 12f );
+			textScale = fontScale;
+
+			// Java 8
+			if( System.getProperty( "java.version" ).startsWith( "1.8" ) ) {
+				// screen scale factor
+				Font winFont2 = (Font) toolkit.getDesktopProperty( "win.defaultGUI.font" );
+				screenScale = roundToQuater( winFont2.getSize() / 11f );
+
+				// text scale factor
+				textScale = roundToQuater( textScale / (float) screenScale );
+			}
+		} else
+			throw new RuntimeException( "OS not supported" );
+
+		File dir = new File( "dumps/desktop-properties" );
+		dir.mkdirs();
+
+		String osPrefix = osName.startsWith( "windows" ) ? "win"
+			: osName.startsWith( "mac" ) ? "mac"
+			: osName.startsWith( "linux" ) ? "linux"
+			: "unknown";
+		String javaVersion = System.getProperty( "java.version" );
+
+		File file = new File( dir, "desktop-properties-" + osPrefix + "-" + javaVersion
+			+ "--" + screenScale + "s-" + textScale + "t.txt" );
+
+		try( PrintStream out = new PrintStream( file ) ) {
+			out.println( "Java version:   " + System.getProperty( "java.version" ) );
+			out.println( "OS:             " + System.getProperty( "os.name" ) );
+			out.println();
+
+			out.println( "Screen scale:   " + screenScale );
+			out.println( "Text scale:     " + textScale );
+			out.println();
+
+			out.println( "Java scale:     " + javaScale );
+			out.println( "Font scale:     " + fontScale );
+			out.println();
+
+			String[] winPropNames = (String[]) toolkit.getDesktopProperty( "win.propNames" );
+			for( String propName : winPropNames ) {
+				Object value = toolkit.getDesktopProperty( propName );
+				out.printf( "%-40s %s\n", propName, String.valueOf( value ) );
+			}
+		} catch( IOException ex ) {
+			ex.printStackTrace();
+		}
+	}
+
+	private static float roundToQuater( float value ) {
+		return Math.round( value * 4f ) / 4f;
+	}
+}