removeLayoutComponent(Component comp) In LayoutManager

Java Example Program/ Sample Source Code

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/*
* RemoveLayoutComponent_LayoutManager.java requires one other file:
*   DiagonalLayout.java
*/

import javax.swing.JButton;
import javax.swing.JFrame;
import java.awt.*;

public class RemoveLayoutComponent_LayoutManager {
    public static void addComponentsToPane(Container pane) {
        pane.setLayout(new DiagonalLayout());

        pane.add(new JButton("Button 1"));
        pane.add(new JButton("Button 2"));
        pane.add(new JButton("Button 3"));
        pane.add(new JButton("Button 4"));
        pane.add(new JButton("Button 5"));
    }

    /**
     * Create the GUI and show it. For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("RemoveLayoutComponent_LayoutManager");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Set up the content pane.
        addComponentsToPane(frame.getContentPane());

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

class DiagonalLayout implements LayoutManager {
    private int vgap;
    private int minWidth = 0, minHeight = 0;
    private int preferredWidth = 0, preferredHeight = 0;
    private boolean sizeUnknown = true;

    public DiagonalLayout() {
        this(5);
    }

    public DiagonalLayout(int v) {
        vgap = v;
    }

    /* Required by LayoutManager. */
    public void addLayoutComponent(String name, Component comp) {
    }

    /* Required by LayoutManager. */
    public void removeLayoutComponent(Component comp) {
    }

    private void setSizes(Container parent) {
        int nComps = parent.getComponentCount();
        Dimension d = null;

        //Reset preferred/minimum width and height.
        preferredWidth = 0;
        preferredHeight = 0;
        minWidth = 0;
        minHeight = 0;

        for (int i = 0; i < nComps; i++) {
            Component c = parent.getComponent(i);
            if (c.isVisible()) {
                d = c.getPreferredSize();

                if (i > 0) {
                    preferredWidth += d.width/2;
                    preferredHeight += vgap;
                } else {
                    preferredWidth = d.width;
                }
                preferredHeight += d.height;

                minWidth = Math.max(c.getMinimumSize().width,
                                    minWidth);
                minHeight = preferredHeight;
            }
        }
    }

    /* Required by LayoutManager. */
    public Dimension preferredLayoutSize(Container parent) {
        Dimension dim = new Dimension(0, 0);

        setSizes(parent);

        //Always add the container's insets!
        Insets insets = parent.getInsets();
        dim.width = preferredWidth
                    + insets.left + insets.right;
        dim.height = preferredHeight
                     + insets.top + insets.bottom;

        sizeUnknown = false;

        return dim;
    }

    /* Required by LayoutManager. */
    public Dimension minimumLayoutSize(Container parent) {
        Dimension dim = new Dimension(0, 0);

        //Always add the container's insets!
        Insets insets = parent.getInsets();
        dim.width = minWidth
                    + insets.left + insets.right;
        dim.height = minHeight
                     + insets.top + insets.bottom;

        sizeUnknown = false;

        return dim;
    }

    /* Required by LayoutManager. */
    /*
     * This is called when the panel is first displayed,
     * and every time its size changes.
     * Note: You CAN'T assume preferredLayoutSize or
     * minimumLayoutSize will be called -- in the case
     * of applets, at least, they probably won't be.
     */
    public void layoutContainer(Container parent) {
        Insets insets = parent.getInsets();
        int maxWidth = parent.getWidth()
                       - (insets.left + insets.right);
        int maxHeight = parent.getHeight()
                        - (insets.top + insets.bottom);
        int nComps = parent.getComponentCount();
        int previousWidth = 0, previousHeight = 0;
        int x = 0, y = insets.top;
        int xFudge = 0, yFudge = 0;
        boolean oneColumn = false;

        // Go through the components' sizes, if neither
        // preferredLayoutSize nor minimumLayoutSize has
        // been called.
        if (sizeUnknown) {
            setSizes(parent);
        }

        if (maxWidth <= minWidth) {
            oneColumn = true;
        }

        if (maxWidth != preferredWidth) {
            xFudge = (maxWidth - preferredWidth)/(nComps - 1);
        }

        if (maxHeight > preferredHeight) {
            yFudge = (maxHeight - preferredHeight)/(nComps - 1);
        }

        for (int i = 0 ; i < nComps ; i++) {
            Component c = parent.getComponent(i);
            if (c.isVisible()) {
                Dimension d = c.getPreferredSize();

                 // increase x and y, if appropriate
                if (i > 0) {
                    if (!oneColumn) {
                        x += previousWidth/2 + xFudge;
                    }
                    y += previousHeight + vgap + yFudge;
                }

                // If x is too large,
                if ((!oneColumn) &&
                    (x + d.width) >
                    (parent.getWidth() - insets.right)) {
                    // reduce x to a reasonable number.
                    x = parent.getWidth()
                        - insets.bottom - d.width;
                }

                // If y is too large,
                if ((y + d.height)
                    > (parent.getHeight() - insets.bottom)) {
                    // do nothing.
                    // Another choice would be to do what we do to x.
                }

                // Set the component's size and position.
                c.setBounds(x, y, d.width, d.height);

                previousWidth = d.width;
                previousHeight = d.height;
            }
        }
    }

    public String toString() {
        String str = "";
        return getClass().getName() + "[vgap=" + vgap + str + "]";
    }
}

removeLayoutComponent(Component comp) In LayoutManager

AlphaComposite

AWTEvent

AWTEventMulticaster

AWTPermission

BasicStroke

BorderLayout

BufferCapabilities

Button

Canvas

CardLayout

Checkbox

CheckboxGroup

CheckboxMenuItem

Choice

Component

Container

Cursor

DefaultFocusTraversalPolicy

DefaultKeyboardFocusManager

Desktop

Dialog

Dimension

DisplayMode

EventQueue

FileDialog

FlowLayout

FocusTraversalPolicy

Font

FontMetrics

Frame

GradientPaint

Graphics

Graphics2D

GraphicsConfigTemplate

GraphicsConfiguration

GraphicsDevice

GraphicsEnvironment

GridBagConstraints

GridBagLayout

GridLayout

Image

ImageCapabilities

Insets

JobAttributes

KeyboardFocusManager

Label

LinearGradientPaint

List

MediaTracker

Menu

MenuBar

MenuItem

MenuShortcut

MouseInfo

MultipleGradientPaint

Panel

Point

PointerInfo

Polygon

PopupMenu

PrintJob

RadialGradientPaint

Rectangle

RenderingHints

RenderingHints.Key

Robot

Scrollbar

ScrollPane

ScrollPaneAdjustable

SplashScreen

SystemColor

SystemTray

TextArea

TextComponent

TextField

TexturePaint

Toolkit

TrayIcon

Window