8345039: IGV: save user-defined node colors to XML

Co-authored-by: Roberto Castañeda Lozano <rcastanedalo@openjdk.org>
Co-authored-by: Christian Hagedorn <chagedorn@openjdk.org>
Reviewed-by: chagedorn, epeter, rcastanedalo

src/utils/IdealGraphVisualizer/Data/src/main/java/com/sun/hotspot/igv/data/InputNode.java

@@ -23,6 +23,7 @@
  */
 package com.sun.hotspot.igv.data;
 
+import java.awt.Color;
 import java.util.Objects;
 
 /**
@@ -67,4 +68,27 @@ public class InputNode extends Properties.Entity {
     public String toString() {
         return "Node " + id + " " + getProperties().toString();
     }
+
+    public void setCustomColor(Color color) {
+        if (color != null) {
+            String hexColor = String.format("#%08X", color.getRGB());
+            getProperties().setProperty("color", hexColor);
+        } else {
+            getProperties().setProperty("color", null);
+        }
+    }
+
+    public Color getCustomColor() {
+        String hexColor = getProperties().get("color");
+        if (hexColor != null) {
+            try {
+                String hex = hexColor.startsWith("#") ? hexColor.substring(1) : hexColor;
+                int argb = (int) Long.parseLong(hex, 16);
+                return new Color(argb, true);
+            } catch (Exception ignored) {
+                return null;
+            }
+        }
+        return null;
+    }
 }

src/utils/IdealGraphVisualizer/Graph/src/main/java/com/sun/hotspot/igv/graph/Diagram.java

@@ -36,6 +36,7 @@ public class Diagram {
 
     private final Map<InputNode, Figure> figures;
     private final Map<InputBlock, Block> blocks;
+    private final InputGraph inputGraph;
     private final String nodeText;
     private final String shortNodeText;
     private final String tinyNodeText;
@@ -66,6 +67,7 @@ public class Diagram {
         this.figures = new LinkedHashMap<>();
         this.blocks = new LinkedHashMap<>(8);
         this.blockConnections = new HashSet<>();
+        this.inputGraph = graph;
         this.cfg = false;
         int curId = 0;
 
@@ -128,6 +130,10 @@ public class Diagram {
         }
     }
 
+    public InputGraph getInputGraph() {
+        return inputGraph;
+    }
+
     public Block getBlock(InputBlock b) {
         assert blocks.containsKey(b);
         return blocks.get(b);

src/utils/IdealGraphVisualizer/Graph/src/main/java/com/sun/hotspot/igv/graph/Figure.java

@@ -23,6 +23,7 @@
  */
 package com.sun.hotspot.igv.graph;
 
+import com.sun.hotspot.igv.data.InputGraph;
 import com.sun.hotspot.igv.data.InputNode;
 import com.sun.hotspot.igv.data.Properties;
 import com.sun.hotspot.igv.layout.Cluster;
@@ -153,8 +154,13 @@ public class Figure extends Properties.Entity implements Vertex {
     }
 
     public Color getColor() {
+        Color customColor = inputNode.getCustomColor();
+        if (customColor != null) {
+            return customColor;
+        } else {
             return color;
         }
+    }
 
     public void setWarning(String warning) {
         this.warning = getProperties().resolveString(warning);
@@ -415,4 +421,16 @@ public class Figure extends Properties.Entity implements Vertex {
     public int compareTo(Vertex f) {
         return toString().compareTo(f.toString());
     }
+
+    public void setCustomColor(Color color) {
+        // Apply custom color not just to this input node but to all
+        // corresponding input nodes in the group.
+        InputGraph graph = diagram.getInputGraph();
+        for (InputGraph g : graph.getGroup().getGraphs()) {
+            InputNode n = g.getNode(inputNode.getId());
+            if (n != null) {
+                n.setCustomColor(color);
+            }
+        }
+    }
 }

src/utils/IdealGraphVisualizer/View/src/main/java/com/sun/hotspot/igv/view/DiagramScene.java

@@ -230,7 +230,7 @@ public class DiagramScene extends ObjectScene implements DiagramViewer, DoubleCl
 
     public void colorSelectedFigures(Color color) {
         for (Figure figure : model.getSelectedFigures()) {
-            figure.setColor(color);
+            figure.setCustomColor(color);
             FigureWidget figureWidget = getWidget(figure);
             if (figureWidget != null) {
                 figureWidget.refreshColor();

src/utils/IdealGraphVisualizer/View/src/main/java/com/sun/hotspot/igv/view/actions/ColorAction.java

@@ -82,6 +82,7 @@ public final class ColorAction extends ModelAwareAction {
 
     private static final JLabel selectedColorLabel = new JLabel("Preview");
     private static final JColorChooser colorChooser = new JColorChooser(Color.WHITE);
+    private static final Color NO_COLOR = new Color(0, 0, 0, 0);
 
     public ColorAction() {
         initializeComponents();
@@ -89,8 +90,8 @@ public final class ColorAction extends ModelAwareAction {
 
     private void initializeComponents() {
         selectedColorLabel.setPreferredSize(new Dimension(3 * 32, 32));
-        selectedColorLabel.setOpaque(true);
+        selectedColorLabel.setOpaque(false); // Allow transparency
-        selectedColorLabel.setBackground(Color.WHITE);
+        selectedColorLabel.setBackground(NO_COLOR); // Set transparent background
         selectedColorLabel.setForeground(Color.BLACK); // Set text color
         selectedColorLabel.setHorizontalAlignment(SwingConstants.CENTER); // Center the text
 
@@ -100,6 +101,7 @@ public final class ColorAction extends ModelAwareAction {
             Color selectedColor = colorChooser.getColor();
             if (selectedColor != null) {
                 selectedColorLabel.setBackground(selectedColor);
+                selectedColorLabel.setOpaque(selectedColor.getAlpha() != 0);
                 selectedColorLabel.setForeground(FigureWidget.getTextColor(selectedColor));
             }
         });
@@ -118,10 +120,27 @@ public final class ColorAction extends ModelAwareAction {
             colorButton.setPreferredSize(new Dimension(16, 16));
             colorButton.addActionListener(e -> {
                 selectedColorLabel.setBackground(color);
+                selectedColorLabel.setOpaque(color.getAlpha() != 0);
                 selectedColorLabel.setForeground(FigureWidget.getTextColor(color));
             });
             colorsPanel.add(colorButton);
         }
+
+        // Add "No Color" button
+        JButton noColorButton = new JButton("No Color");
+        noColorButton.setOpaque(true);
+        noColorButton.setContentAreaFilled(true);
+        noColorButton.setBorderPainted(true);
+        noColorButton.setPreferredSize(new Dimension(90, 24));
+        noColorButton.setFocusPainted(false);
+        noColorButton.addActionListener(e -> {
+            selectedColorLabel.setBackground(NO_COLOR);
+            selectedColorLabel.setOpaque(false);
+            selectedColorLabel.setForeground(Color.BLACK);
+        });
+        colorsPanel.add(noColorButton);
+
+        // Add the preview label
         colorsPanel.add(selectedColorLabel, 0);
         colorsPanel.revalidate();
         colorsPanel.repaint();
@@ -148,9 +167,10 @@ public final class ColorAction extends ModelAwareAction {
                         dialogLoc = dialogHolder[0].getLocation();
                         // OK button action
                         Color selectedColor = selectedColorLabel.getBackground();
-                        if (selectedColor != null) {
+                        if (selectedColor.equals(NO_COLOR)) {
-                            editor.colorSelectedFigures(selectedColor);
+                            selectedColor = null;
                         }
+                        editor.colorSelectedFigures(selectedColor);
                     },
                     null // Cancel button action
             );

src/utils/IdealGraphVisualizer/View/src/main/java/com/sun/hotspot/igv/view/widgets/FigureWidget.java

@@ -271,6 +271,7 @@ public class FigureWidget extends Widget implements Properties.Provider, PopupMe
 
     @Override
     protected void paintChildren() {
+        refreshColor();
         Composite oldComposite = null;
         if (boundary) {
             oldComposite = getScene().getGraphics().getComposite();