As far as internal structure of JTabbedPane data model does not correspond to its visual representation, that is, component located on tab with index X is not located in the internal components array using the same index, we have to rearrange this array each time tab has been moved and repopulate/repaint JTabbedPane instance after that. - Java Swing

Java examples for Swing:JTabbedPane

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Description

As far as internal structure of JTabbedPane data model does not correspond to its visual representation, that is, component located on tab with index X is not located in the internal components array using the same index, we have to rearrange this array each time tab has been moved and repopulate/repaint JTabbedPane instance after that.

Demo Code


//package com.java2s;
import java.awt.Component;
import javax.swing.Icon;
import javax.swing.JTabbedPane;

public class Main {
    /**//from   w  w  w.ja  v  a  2s .c om
     * As far as internal structure of JTabbedPane data model does not correspond to its visual representation, that is, component located
     * on tab with index X is <b>not</b> located in the internal components array using the same index, we have to rearrange this array
     * each time tab has been moved and repopulate/repaint JTabbedPane instance after that.
     * 
     */
    public static void moveTab(JTabbedPane tabPane, int srcIndex,
            int dstIndex) {

        int cnt = tabPane.getTabCount();

        // get tabpane's components/captions/icons
        Component[] components = new Component[cnt];
        for (int i = 0; i < cnt; i++) {
            components[i] = tabPane.getComponent(i);
        }
        String[] captions = new String[cnt];
        for (int i = 0; i < cnt; i++) {
            captions[i] = tabPane.getTitleAt(i);
        }
        Icon[] icons = new Icon[cnt];
        for (int i = 0; i < cnt; i++) {
            icons[i] = tabPane.getIconAt(i);
        }

        // remember component/caption/icon that has to be moved
        Component srcComp = components[srcIndex];
        String srcCap = captions[srcIndex];
        Icon srcIcon = icons[srcIndex];

        // rearrange components/captions/icons using shifting
        if (srcIndex > dstIndex) {
            for (int i = srcIndex; i > dstIndex; i--) {
                components[i] = components[i - 1];
                captions[i] = captions[i - 1];
                icons[i] = icons[i - 1];
            }
        } else {
            for (int i = srcIndex; i < dstIndex; i++) {
                components[i] = components[i + 1];
                captions[i] = captions[i + 1];
                icons[i] = icons[i + 1];
            }
        }

        // set moved component/caption/icon to its new position
        components[dstIndex] = srcComp;
        captions[dstIndex] = srcCap;
        icons[dstIndex] = srcIcon;

        // remove everything from tabpane before repopulating it
        tabPane.removeAll();

        // repopulate tabpane with resulting components/captions
        for (int i = 0; i < cnt; i++) {
            tabPane.addTab(captions[i], icons[i], components[i]);
        }

        // set moved component as selected
        tabPane.setSelectedIndex(dstIndex);

        // repaint tabpane
        tabPane.repaint();

    }

    public static void moveTab(JTabbedPane srcTabPane, int index,
            JTabbedPane dstTabPane) {

        Component component = srcTabPane.getComponent(index);
        String caption = srcTabPane.getTitleAt(index);
        Icon icon = srcTabPane.getIconAt(index);
        srcTabPane.remove(component);
        dstTabPane.addTab(caption, icon, component);

    }
}

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