Create RunEDTActionOnFirstRenderHierarchyListener.

src/main/java/com/blackberry/jwteditor/view/editor/EditorView.java

@@ -27,6 +27,7 @@
 import com.blackberry.jwteditor.view.rsta.RstaFactory;
 import com.blackberry.jwteditor.view.utils.ErrorLoggingActionListenerFactory;
 import com.blackberry.jwteditor.view.utils.MaxLengthStringComboBoxModel;
+import com.blackberry.jwteditor.view.utils.RunEDTActionOnFirstRenderHierarchyListener;
 import org.exbin.deltahex.EditationAllowed;
 import org.exbin.deltahex.swing.CodeArea;
 import org.exbin.utils.binary_data.ByteArrayEditableData;
@@ -38,14 +39,11 @@
 import javax.swing.event.DocumentEvent;
 import javax.swing.event.DocumentListener;
 import java.awt.*;
-import java.awt.event.HierarchyEvent;
-import java.awt.event.HierarchyListener;
 import java.util.List;
 
 import static java.awt.Color.RED;
 import static java.awt.EventQueue.invokeLater;
 import static java.awt.Font.BOLD;
-import static java.awt.event.HierarchyEvent.SHOWING_CHANGED;
 import static org.exbin.deltahex.EditationAllowed.ALLOWED;
 import static org.exbin.deltahex.EditationAllowed.READ_ONLY;
 
@@ -114,7 +112,13 @@ public abstract class EditorView {
         this.isProVersion = isProVersion;
         this.presenter = new EditorPresenter(this, collaboratorPayloadGenerator, actionListenerFactory, presenters);
 
-        panel.addHierarchyListener(new ResizeSplitPanesOnFirstRenderHierarchyListener());
+        panel.addHierarchyListener(new RunEDTActionOnFirstRenderHierarchyListener(
+                panel,
+                () -> {
+                    upperSplitPane.setDividerLocation(0.25);
+                    lowerSplitPane.setDividerLocation(0.75);
+                }
+        ));
 
         // Event handler for Header / JWS payload change events
         DocumentListener documentListener = new DocumentListener() {
@@ -549,20 +553,4 @@ public void setWarnings(String text) {
             labelWarnings.setText(text);
         });
     }
-
-    private class ResizeSplitPanesOnFirstRenderHierarchyListener implements HierarchyListener {
-        @Override
-        public void hierarchyChanged(HierarchyEvent e) {
-            if (e.getChangeFlags() != SHOWING_CHANGED || !e.getComponent().isShowing()) {
-                return;
-            }
-
-            invokeLater(() -> {
-                        upperSplitPane.setDividerLocation(0.25);
-                        lowerSplitPane.setDividerLocation(0.75);
-                    });
-
-            panel.removeHierarchyListener(this);
-        }
-    }
 }

src/main/java/com/blackberry/jwteditor/view/utils/PercentageBasedColumnWidthTable.java

@@ -20,17 +20,13 @@
 
 import javax.swing.*;
 import javax.swing.table.TableColumnModel;
-import java.awt.event.HierarchyEvent;
-import java.awt.event.HierarchyListener;
-
-import static java.awt.event.HierarchyEvent.SHOWING_CHANGED;
 
 public class PercentageBasedColumnWidthTable extends JTable {
     private final int[] columnWidthPercentages;
 
     public PercentageBasedColumnWidthTable(int[] columnWidthPercentages) {
         this.columnWidthPercentages = columnWidthPercentages;
-        addHierarchyListener(new ResizeColumnsOnFirstRenderHierarchyListener());
+        addHierarchyListener(new RunEDTActionOnFirstRenderHierarchyListener(this, this::resizeColumns));
 
         tableHeader.setReorderingAllowed(false);
     }
@@ -49,16 +45,4 @@ private void resizeColumns() {
             columnModel.getColumn(i).setPreferredWidth(preferredWidth);
         }
     }
-
-    private class ResizeColumnsOnFirstRenderHierarchyListener implements HierarchyListener {
-        @Override
-        public void hierarchyChanged(HierarchyEvent e) {
-            if (e.getChangeFlags() != SHOWING_CHANGED || !e.getComponent().isShowing()) {
-                return;
-            }
-
-            resizeColumns();
-            removeHierarchyListener(this);
-        }
-    }
 }

src/main/java/com/blackberry/jwteditor/view/utils/RunEDTActionOnFirstRenderHierarchyListener.java

@@ -0,0 +1,44 @@
+/*
+Author : Dolph Flynn
+
+Copyright 2024 Dolph Flynn
+
+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
+
+   http://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.blackberry.jwteditor.view.utils;
+
+import java.awt.*;
+import java.awt.event.HierarchyEvent;
+import java.awt.event.HierarchyListener;
+
+import static java.awt.EventQueue.invokeLater;
+import static java.awt.event.HierarchyEvent.SHOWING_CHANGED;
+
+public class RunEDTActionOnFirstRenderHierarchyListener implements HierarchyListener {
+    private final Component component;
+    private final Runnable action;
+
+    public RunEDTActionOnFirstRenderHierarchyListener(Component component, Runnable action) {
+        this.component = component;
+        this.action = action;
+    }
+
+    @Override
+    public void hierarchyChanged(HierarchyEvent e) {
+        if (e.getChangeFlags() == SHOWING_CHANGED && e.getComponent().isShowing()) {
+            invokeLater(action);
+            component.removeHierarchyListener(this);
+        }
+    }
+}