VerticalTabbedPaneUI.java

package net.squiz.matrix.plaf;

import java.awt.*;
import javax.swing.plaf.basic.*;

public class VerticalTabbedPaneUI extends BasicTabbedPaneUI {
    private boolean tabsVertical;

    public VerticalTabbedPaneUI(boolean tabsVertical) {
        this.tabsVertical = tabsVertical;
    }

    protected void installDefaults() {
        super.installDefaults();
        if (tabsVertical) {
            // All tab padding
            // Insets(left, top, right, bottom)
            tabAreaInsets = new Insets(2, 2, 0, 0);

            // Individual tab properties
            // Insets(width from left, height top , width from right, height from bottom)
            tabInsets = new Insets(0, 0, 0, 0);

            // Tab content panel insets
            // Insets(top, left, bottom, right)
            contentBorderInsets = new Insets(0, 0, 0, 0);

            // Selected tab insets
            // Insets(height, width, height, width)
            selectedTabPadInsets = new Insets(2, 0, 1, 1);
        }
    }

    protected void paintFocusIndicator(Graphics g,
                                    int tabPlacement,
                                    Rectangle[] rects,
                                    int tabIndex,
                                    Rectangle iconRect,
                                    Rectangle textRect,
                                    boolean isSelected) {

        // Do nothing
    }

    protected void paintTabBorder(Graphics g,
                                int tabPlacement,
                                int tabIndex,
                                int x,
                                int y,
                                int w,
                                int h,
                                boolean isSelected) {

        if (!isSelected && tabsVertical) {
            g.setColor(MatrixLookAndFeel.PANEL_BORDER_COLOUR.darker());
            int right_x = x + w - 1;
            g.drawLine(right_x, y, right_x, y+h);
        }

        super.paintTabBorder(g, tabPlacement, tabIndex, x, y, w, h, isSelected);
    }

}