Java JComponent Properties isActive(JComponent c)

Description

is Active

License

Open Source License

Declaration

public static boolean isActive(JComponent c) 

Method Source Code

//package com.java2s;
/*/*w w  w  .j a va  2 s  . c o  m*/
 * Copyright 2005 MH-Software-Entwicklung. All rights reserved.
 * Use is subject to license terms.
 */

import java.lang.reflect.*;
import java.awt.*;
import javax.swing.*;

public class Main {
    private static Double javaVersion = null;

    public static boolean isActive(JComponent c) {
        if (c == null) {
            return false;
        }

        boolean active = true;
        if (c instanceof JInternalFrame) {
            active = ((JInternalFrame) c).isSelected();
        }
        if (active) {
            Container parent = c.getParent();
            while (parent != null) {
                if (parent instanceof JInternalFrame) {
                    active = ((JInternalFrame) parent).isSelected();
                    break;
                }
                parent = parent.getParent();
            }
        }
        if (active) {
            active = isFrameActive(c);
        }
        return active;
    }

    public static boolean isFrameActive(JComponent c) {
        if (c == null) {
            return false;
        }

        if (c.getTopLevelAncestor() instanceof Window) {
            return isWindowActive((Window) c.getTopLevelAncestor());
        }

        return true;
    }

    public static boolean isWindowActive(Window window) {
        if (getJavaVersion() >= 1.4) {
            try {
                Class paramTypes[] = null;
                Object args[] = null;
                Method m = window.getClass().getMethod("isActive",
                        paramTypes);
                Boolean b = (Boolean) m.invoke(window, args);
                return b.booleanValue();
            } catch (Exception ex) {
            }
        }
        return true;
    }

    public static double getJavaVersion() {
        if (javaVersion == null) {
            try {
                String ver = System.getProperties().getProperty(
                        "java.version");
                String version = "";
                boolean firstPoint = true;
                for (int i = 0; i < ver.length(); i++) {
                    if (ver.charAt(i) == '.') {
                        if (firstPoint) {
                            version += ver.charAt(i);
                        }
                        firstPoint = false;
                    } else if (Character.isDigit(ver.charAt(i))) {
                        version += ver.charAt(i);
                    }
                }
                javaVersion = new Double(version);
            } catch (Exception ex) {
                javaVersion = new Double(1.3);
            }
        }
        return javaVersion.doubleValue();
    }
}

Related

1. getProperties(JComponent component)
2. getProperties(JComponent component)
3. getProperties(JComponent component)
4. getVisibleBoundsOnScreen(JComponent component)
5. invert(JComponent c)
6. isComponentShowing(final JComponent component)
7. isHorizontallyVisible(JComponent c, int from, int to)
8. isMandatory(JComponent comp)
9. isMarker(JComponent component)