Made Close button Explicit (#3104)

- Crerated Action for close button.
- Added icon.
- Made sure that close button closes the active tabbed editor instead of random tool windows.

Author: dnikodem84

ugs-platform/ugs-platform-ugscore/src/main/java/com/willwinder/ugs/nbp/core/actions/CloseFileAction.java

@@ -0,0 +1,113 @@
+/*
+    Copyright 2026 Damian Nikodem
+
+    This file is part of Universal Gcode Sender (UGS).
+
+    UGS is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    UGS is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with UGS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.willwinder.ugs.nbp.core.actions;
+
+import com.willwinder.ugs.nbp.lib.Mode;
+import com.willwinder.ugs.nbp.lib.services.LocalizingService;
+import org.openide.awt.ActionID;
+import org.openide.awt.ActionReference;
+import org.openide.awt.ActionReferences;
+import org.openide.awt.ActionRegistration;
+import org.openide.loaders.DataObject;
+import org.openide.util.ImageUtilities;
+import org.openide.windows.TopComponent;
+import org.openide.windows.WindowManager;
+
+import javax.swing.AbstractAction;
+import java.awt.event.ActionEvent;
+
+/**
+ * Closes the currently open editor/program file.
+ *
+ * @author Damian Nikodem
+ */
+@ActionID(
+        category = LocalizingService.CATEGORY_FILE,
+        id = "com.willwinder.ugs.nbp.core.actions.CloseFileAction")
+@ActionRegistration(
+        displayName = "Close",
+        lazy = false)
+@ActionReferences({
+        @ActionReference(
+                path = LocalizingService.MENU_FILE,
+                position = 250)
+})
+public class CloseFileAction extends AbstractAction {
+    public static final String ICON_BASE = "resources/icons/close.svg";
+    private static final String WELCOME_PAGE_CLASS = "com.willwinder.ugp.welcome.WelcomePageTopComponent";
+    private static final String GCODE_MIME_TYPE = "text/xgcode";
+    private static final String DESIGN_MIME_TYPE = "application/x-ugs";
+
+    public CloseFileAction() {
+        putValue("iconBase", ICON_BASE);
+        putValue(SMALL_ICON, ImageUtilities.loadImageIcon(ICON_BASE, false));
+        putValue(NAME, "Close");
+        putValue("noIconInMenu", Boolean.FALSE);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        TopComponent activated = TopComponent.getRegistry().getActivated();
+        if (activated != null && WELCOME_PAGE_CLASS.equals(activated.getClass().getName()) && activated.close()) {
+            return;
+        }
+
+        TopComponent selectedEditor = getSelectedEditorTopComponent();
+        if (selectedEditor != null && isCloseableDocument(selectedEditor)) {
+            selectedEditor.close();
+        }
+    }
+
+    private boolean isCloseableDocument(TopComponent topComponent) {
+        if (WELCOME_PAGE_CLASS.equals(topComponent.getClass().getName())) {
+            return true;
+        }
+
+        DataObject dataObject = topComponent.getLookup().lookup(DataObject.class);
+        if (dataObject == null) {
+            return false;
+        }
+
+        String mimeType = dataObject.getPrimaryFile().getMIMEType();
+        return GCODE_MIME_TYPE.equals(mimeType) || DESIGN_MIME_TYPE.equals(mimeType);
+    }
+
+    private TopComponent getSelectedEditorTopComponent() {
+        TopComponent primaryEditor = getSelectedTopComponentForMode(Mode.EDITOR_PRIMARY);
+        if (primaryEditor != null && isCloseableDocument(primaryEditor)) {
+            return primaryEditor;
+        }
+
+        TopComponent secondaryEditor = getSelectedTopComponentForMode(Mode.EDITOR_SECONDARY);
+        if (secondaryEditor != null && isCloseableDocument(secondaryEditor)) {
+            return secondaryEditor;
+        }
+
+        return null;
+    }
+
+    private TopComponent getSelectedTopComponentForMode(String modeName) {
+        org.openide.windows.Mode mode = WindowManager.getDefault().findMode(modeName);
+        if (mode == null) {
+            return null;
+        }
+
+        return mode.getSelectedTopComponent();
+    }
+}

ugs-platform/ugs-platform-ugscore/src/main/resources/com/willwinder/ugs/nbp/core/layer.xml

@@ -74,16 +74,6 @@
             <file name="org-openide-actions-SaveAsAction.instance_hidden"/>
             <file name="org-netbeans-modules-editor-ExportHtmlAction.shadow_hidden"/>
 
-            <file name="org-openide-actions-CloseAction.instance">
-                <attr name="instanceCreate" methodvalue="org.openide.awt.Actions.context"/>
-                <attr name="delegate" methodvalue="org.openide.awt.Actions.performer"/>
-                <attr name="selectionType" stringvalue="ANY"/>
-                <attr name="surviveFocusChange" boolvalue="false"/>
-                <attr name="displayName" bundlevalue="org/openide/awt/Bundle#Close"/>
-                <attr name="noIconInMenu" boolvalue="true"/>
-                <attr name="type" stringvalue="org.netbeans.api.actions.Closable"/>
-            </file>
-
             <file name="Separator3.instance_hidden"/>
             <file name="org-openide-actions-PageSetupAction.shadow_hidden"/>
             <file name="org-openide-actions-PrintAction.shadow_hidden"/>