Set focus to right field in preference page

eclipse-solargraph-plugin/src/main/java/io/github/pyvesb/eclipse_solargraph/launch/debug/ReadaptDebugDelegate.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2019-2021 Pierre-Yves B. and others.
+ * Copyright (c) 2019-2022 Pierre-Yves B. and others.
  *
  * This program and the accompanying materials are made
  * available under the terms of the Eclipse Public License 2.0
@@ -28,6 +28,7 @@
 import org.eclipse.debug.core.ILaunch;
 import org.eclipse.debug.core.ILaunchConfiguration;
 import org.eclipse.jface.dialogs.MessageDialog;
+import org.eclipse.jface.preference.PreferenceDialog;
 import org.eclipse.lsp4e.debug.launcher.DSPLaunchDelegate;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.dialogs.PreferencesUtil;
@@ -68,16 +69,19 @@ public void launch(ILaunchConfiguration configuration, String mode, ILaunch laun
 	private void displayNotFoundWarning() {
 		Display display = Display.getDefault();
 		display.asyncExec(() -> {
-			MessageDialog dialog = new MessageDialog(display.getActiveShell(), "Readapt was not found", null,
+			MessageDialog notFoundDialog = new MessageDialog(display.getActiveShell(), "Readapt was not found", null,
 					"Readapt is required for debugging. Let Eclipse install the gem locally or specify its path "
 							+ "after running \"gem install readapt\" in a terminal." + System.lineSeparator()
 							+ System.lineSeparator() + "Please restart the debug session once installation is complete.",
 					MessageDialog.WARNING, 0, "Install gem", "Specify path");
-			if (dialog.open() == 0) { // First button index, install.
+			if (notFoundDialog.open() == 0) { // First button index, install.
 				GemHelper.install("Readapt", READAPT_PATH);
 				HAS_UPDATED_READAPT.set(true);
 			} else {
-				PreferencesUtil.createPreferenceDialogOn(null, PreferencePage.PAGE_ID, null, null).open();
+				PreferenceDialog preferenceDialog = PreferencesUtil.createPreferenceDialogOn(null, PreferencePage.PAGE_ID,
+						null, null);
+				((PreferencePage) preferenceDialog.getSelectedPage()).getReadaptPath().setFocus();
+				preferenceDialog.open();
 			}
 		});
 	}

eclipse-solargraph-plugin/src/main/java/io/github/pyvesb/eclipse_solargraph/preferences/PreferencePage.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2020-2021 Pierre-Yves B. and others.
+ * Copyright (c) 2020-2022 Pierre-Yves B. and others.
  *
  * This program and the accompanying materials are made
  * available under the terms of the Eclipse Public License 2.0
@@ -50,15 +50,19 @@ public class PreferencePage extends FieldEditorPreferencePage implements IWorkbe
 
 	public static final String PAGE_ID = "io.github.pyvesb.eclipse_solargraph";
 
+	private FileFieldEditor gemPath;
+	private FileFieldEditor readaptPath;
 	private BooleanFieldEditor systemRubyFieldEditor;
 	private DirectoryFieldEditor rubyDirFieldEditor;
 	private Composite rubyDirFieldEditorParent;
 	private Image gitHubImage;
 
 	@Override
 	public void createFieldEditors() {
-		addField(new FileFieldEditor(GEM_PATH.getKey(), GEM_PATH.getDesc(), true, getFieldEditorParent()));
-		addField(new FileFieldEditor(READAPT_PATH.getKey(), READAPT_PATH.getDesc(), true, getFieldEditorParent()));
+		gemPath = new FileFieldEditor(GEM_PATH.getKey(), GEM_PATH.getDesc(), true, getFieldEditorParent());
+		addField(gemPath);
+		readaptPath = new FileFieldEditor(READAPT_PATH.getKey(), READAPT_PATH.getDesc(), true, getFieldEditorParent());
+		addField(readaptPath);
 		addField(new BooleanFieldEditor(UPDATE_GEM.getKey(), UPDATE_GEM.getDesc(), getFieldEditorParent()));
 		systemRubyFieldEditor = new BooleanFieldEditor(SYSTEM_RUBY.getKey(), SYSTEM_RUBY.getDesc(), getFieldEditorParent());
 		addField(systemRubyFieldEditor);
@@ -105,4 +109,12 @@ public void dispose() {
 		}
 	}
 
+	public FileFieldEditor getGemPath() {
+		return gemPath;
+	}
+
+	public FileFieldEditor getReadaptPath() {
+		return readaptPath;
+	}
+
 }

eclipse-solargraph-plugin/src/main/java/io/github/pyvesb/eclipse_solargraph/server/SolargraphStreamConnectionProvider.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2019-2020 Pierre-Yves B. and others.
+ * Copyright (c) 2019-2022 Pierre-Yves B. and others.
  *
  * This program and the accompanying materials are made
  * available under the terms of the Eclipse Public License 2.0
@@ -23,6 +23,7 @@
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import org.eclipse.jface.dialogs.MessageDialog;
+import org.eclipse.jface.preference.PreferenceDialog;
 import org.eclipse.lsp4e.server.ProcessStreamConnectionProvider;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.dialogs.PreferencesUtil;
@@ -65,15 +66,18 @@ private static List<String> getSolargraphCommand() {
 	private void displayNotFoundWarning() {
 		Display display = Display.getDefault();
 		display.asyncExec(() -> {
-			MessageDialog dialog = new MessageDialog(display.getActiveShell(), "Solargraph was not found", null,
+			MessageDialog notFoundDialog = new MessageDialog(display.getActiveShell(), "Solargraph was not found", null,
 					"Key features will not be available. Let Eclipse install the gem locally or specify its path "
 							+ "after running \"gem install solargraph\" in a terminal.",
 					MessageDialog.WARNING, 0, "Install gem", "Specify path");
-			if (dialog.open() == 0) { // First button index, install.
+			if (notFoundDialog.open() == 0) { // First button index, install.
 				GemHelper.install("Solargraph", GEM_PATH);
 				HAS_UPDATED_SOLARGRAPH.set(true);
 			} else {
-				PreferencesUtil.createPreferenceDialogOn(null, PreferencePage.PAGE_ID, null, null).open();
+				PreferenceDialog preferenceDialog = PreferencesUtil.createPreferenceDialogOn(null, PreferencePage.PAGE_ID,
+						null, null);
+				((PreferencePage) preferenceDialog.getSelectedPage()).getGemPath().setFocus();
+				preferenceDialog.open();
 			}
 		});
 	}