re-enable LiveDataPane fix #4842

java_console/ui/src/main/java/com/rusefi/ConsoleUI.java

@@ -128,10 +128,7 @@ public class ConsoleUI {
         if (!linkManager.isLogViewer())
             tabbedPane.addTab("Settings", tabbedPane.settingsTab.createPane());
         if (!linkManager.isLogViewer()) {
-            /**
-             * re-enable under https://github.com/rusefi/rusefi/issues/4842
-            tabbedPane.addTab("Live Data", new LiveDataPane(uiContext).getContent());
-             */
+            tabbedPane.addTab("Live Data", LiveDataPane.createLazy(uiContext).getContent());
             tabbedPane.addTab("Sensors Live Data", new SensorsLiveDataPane(uiContext).getContent());
         }
 

java_console/ui/src/main/java/com/rusefi/ui/InitOnFirstPaintPanel.java

@@ -0,0 +1,33 @@
+package com.rusefi.ui;
+
+import com.rusefi.ui.util.UiUtils;
+
+import javax.swing.*;
+import java.awt.*;
+
+public abstract class InitOnFirstPaintPanel {
+    private final JPanel content = new JPanel(new BorderLayout()) {
+        boolean isFirstPaint = true;
+
+        @Override
+        public void paint(Graphics g) {
+            if (isFirstPaint) {
+                content.removeAll();
+                content.add(createContent(), BorderLayout.CENTER);
+                UiUtils.trueRepaint(content);
+                isFirstPaint = false;
+            }
+            super.paint(g);
+        }
+    };
+
+    protected abstract JPanel createContent();
+
+    public InitOnFirstPaintPanel() {
+        content.add(new JLabel("Initializing..."), BorderLayout.CENTER);
+    }
+
+    public JComponent getContent() {
+        return content;
+    }
+}

java_console/ui/src/main/java/com/rusefi/ui/LiveDataPane.java

@@ -42,7 +42,7 @@ public class LiveDataPane {
     private final JPanel content = new JPanel(new BorderLayout());
     private boolean isPaused;
 
-    public LiveDataPane(UIContext uiContext) {
+    private LiveDataPane(UIContext uiContext) {
         long start = System.currentTimeMillis();
 
         JPanel vertical = new JPanel(new MigLayout("wrap 1", "[grow,fill]"));
@@ -141,6 +141,16 @@ public class LiveDataPane {
         log.info("created in " + (System.currentTimeMillis() - start) + "ms");
     }
 
+    public static InitOnFirstPaintPanel createLazy(UIContext uiContext) {
+        InitOnFirstPaintPanel panel = new InitOnFirstPaintPanel() {
+            @Override
+            protected JPanel createContent() {
+                return new LiveDataPane(uiContext).getContent();
+            }
+        };
+        return panel;
+    }
+
     @NotNull
     private JPanel populateLegend() {
         JPanel legend = new JPanel(new VerticalFlowLayout());

java_console/ui/src/test/java/com/rusefi/ui/LiveDataPaneSandbox.java

@@ -7,6 +7,8 @@ import javax.swing.*;
 public class LiveDataPaneSandbox {
     public static void main(String[] args) {
         UIContext uiContext = new UIContext();
-        new FrameHelper(WindowConstants.EXIT_ON_CLOSE).showFrame(new LiveDataPane(uiContext).getContent());
+        InitOnFirstPaintPanel panel = LiveDataPane.createLazy(uiContext);
+
+        new FrameHelper(WindowConstants.EXIT_ON_CLOSE).showFrame(panel.getContent());
     }
 }