start creating a good jpanel for combobox + button

src/main/java/ai/nets/samj/gui/ModelSelection.java

@@ -0,0 +1,123 @@
+package ai.nets.samj.gui;
+
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Insets;
+import java.awt.event.ComponentAdapter;
+import java.awt.event.ComponentEvent;
+import java.util.List;
+import javax.swing.JButton;
+import javax.swing.JComboBox;
+import javax.swing.JPanel;
+
+import ai.nets.samj.gui.components.ComboBoxItem;
+import io.bioimage.modelrunner.model.Model;
+
+public class ModelSelection extends JPanel {
+
+    private static final long serialVersionUID = 2478618937640492286L;
+
+    private JComboBox<String> modelCombobox = new JComboBox<String>();
+    private JButton btn = new JButton("▶");
+    private static final double RATIO_CBX_BTN = 10.0;
+
+    public ModelSelection(List<Model> models) {
+        // Populate the JComboBox with models
+        modelCombobox.addItem("GAGA");
+
+        // Set layout manager to null for absolute positioning
+        setLayout(null);
+
+        // Add components to the panel
+        add(modelCombobox);
+        add(btn);
+
+        // Add a ComponentListener to the button to adjust font size
+        btn.addComponentListener(new ComponentAdapter() {
+            @Override
+            public void componentResized(ComponentEvent e) {
+                adjustButtonFont();
+            }
+        });
+    }
+
+    @Override
+    public void doLayout() {
+        int inset = 5; // Separation between components and edges
+        int totalInsets = inset * 3; // Left, middle, and right insets
+
+        int width = getWidth();
+        int height = getHeight();
+
+        int availableWidth = width - totalInsets;
+        double ratioSum = RATIO_CBX_BTN + 1;
+
+        // Calculate widths based on the ratio
+        int comboWidth = (int) Math.round(availableWidth * RATIO_CBX_BTN / ratioSum);
+        int btnWidth = availableWidth - comboWidth;
+
+        int x = inset;
+        int y = inset;
+        int componentHeight = height - (2 * inset); // Account for top and bottom insets
+
+        // Set bounds for the JComboBox
+        modelCombobox.setBounds(x, y, comboWidth, componentHeight);
+
+        x += comboWidth + inset; // Move x position for the JButton
+
+        // Set bounds for the JButton
+        btn.setBounds(x, y, btnWidth, componentHeight);
+
+        // Adjust font size after layout
+        adjustButtonFont();
+    }
+
+    // Method to adjust the font size based on button size
+    private void adjustButtonFont() {
+        int btnHeight = btn.getHeight();
+        int btnWidth = btn.getWidth();
+
+        if (btnHeight <= 0 || btnWidth <= 0) {
+            return; // Cannot calculate font size with non-positive dimensions
+        }
+
+        // Get the button's insets
+        Insets insets = btn.getInsets();
+        int availableWidth = btnWidth - insets.left - insets.right;
+
+        // Start with a font size based on button height
+        int fontSize = btnHeight - insets.top - insets.bottom - 4; // Subtract padding
+
+        // Get the current font
+        Font originalFont = btn.getFont();
+        Font font = originalFont.deriveFont((float) fontSize);
+
+        FontMetrics fm = btn.getFontMetrics(font);
+        int textWidth = fm.stringWidth(btn.getText());
+
+        // Reduce font size until text fits
+        while (textWidth > availableWidth && fontSize > 0) {
+            fontSize--;
+            font = originalFont.deriveFont((float) fontSize);
+            fm = btn.getFontMetrics(font);
+            textWidth = fm.stringWidth(btn.getText());
+        }
+
+        // Apply the new font
+        btn.setFont(font);
+
+        // Center the text
+        btn.setHorizontalAlignment(JButton.CENTER);
+        btn.setVerticalAlignment(JButton.CENTER);
+    }
+
+    public static void main(String[] args) {
+        javax.swing.SwingUtilities.invokeLater(() -> {
+            javax.swing.JFrame frame = new javax.swing.JFrame("Model Selection");
+            frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
+            frame.add(new ModelSelection(null));
+            frame.setSize(400, 100); // Adjust the size as needed
+            frame.setVisible(true);
+        });
+    }
+}