Ответ 1
Вот пример VerticalFlowLayout. Это копия класса FlowLayout с некоторой логикой, измененной как ориентированная на "вертикаль", а не ориентированная по горизонтали:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* A flow layout arranges components in a directional flow, much
* like lines of text in a paragraph. The flow direction is
* determined by the container <code>componentOrientation</code>
* property and may be one of two values:
* <ul>
* <li><code>ComponentOrientation.TOP_TO_BOTTOM</code>
* <li><code>ComponentOrientation.BOTTOM_TO_TOP</code>
* </ul>
* Flow layouts are typically used
* to arrange buttons in a panel. It arranges buttons
* horizontally until no more buttons fit on the same line.
* The line alignment is determined by the <code>align</code>
* property. The possible values are:
* <ul>
* <li>{@link #TOP TOP}
* <li>{@link #BOTTOM BOTTOM}
* <li>{@link #CENTER CENTER}
* <li>{@link #LEADING LEADING}
* <li>{@link #TRAILING TRAILING}
* </ul>
* <p>
*/
public class VerticalFlowLayout implements LayoutManager, java.io.Serializable
{
/**
* This value indicates that each row of components
* should be left-justified.
*/
public static final int TOP = 0;
/**
* This value indicates that each row of components
* should be centered.
*/
public static final int CENTER = 1;
/**
* This value indicates that each row of components
* should be right-justified.
*/
public static final int BOTTOM = 2;
/**
* <code>align</code> is the property that determines
* how each column distributes empty space.
* It can be one of the following three values:
* <ul>
* <code>TOP</code>
* <code>BOTTOM</code>
* <code>CENTER</code>
* </ul>
*
* @see #getAlignment
* @see #setAlignment
*/
int align; // This is the one we actually use
/**
* The flow layout manager allows a seperation of
* components with gaps. The horizontal gap will
* specify the space between components and between
* the components and the borders of the
* <code>Container</code>.
*
* @see #getHgap()
* @see #setHgap(int)
*/
int hgap;
/**
* The flow layout manager allows a seperation of
* components with gaps. The vertical gap will
* specify the space between rows and between the
* the rows and the borders of the <code>Container</code>.
*
* @see #getHgap()
* @see #setHgap(int)
*/
int vgap;
/**
* Constructs a new <code>VerticalFlowLayout</code> with a centered alignment and a
* default 5-unit horizontal and vertical gap.
*/
public VerticalFlowLayout()
{
this(CENTER, 5, 5);
}
/**
* Constructs a new <code>VerticalFlowLayout</code> with the specified
* alignment and a default 5-unit horizontal and vertical gap.
* The value of the alignment argument must be one of
* <code>VerticalFlowLayout.TOP</code>, <code>VerticalFlowLayout.BOTTOM</code>,
* or <code>VerticalFlowLayout.CENTER</code>
* @param align the alignment value
*/
public VerticalFlowLayout(int align)
{
this(align, 5, 5);
}
/**
* Creates a new flow layout manager with the indicated alignment
* and the indicated horizontal and vertical gaps.
* <p>
* The value of the alignment argument must be one of
* <code>VerticalFlowLayout.TOP</code>, <code>VerticalFlowLayout.BOTTOM</code>,
* or <code>VerticalFlowLayout.CENTER</code>.
* @param align the alignment value
* @param hgap the horizontal gap between components
* and between the components and the
* borders of the <code>Container</code>
* @param vgap the vertical gap between components
* and between the components and the
* borders of the <code>Container</code>
*/
public VerticalFlowLayout(int align, int hgap, int vgap)
{
this.hgap = hgap;
this.vgap = vgap;
setAlignment(align);
}
/**
* Gets the alignment for this layout.
* Possible values are <code>VerticalFlowLayout.TOP</code>,
* <code>VerticalFlowLayout.BOTTOM</code> or <code>VerticalFlowLayout.CENTER</code>,
* @return the alignment value for this layout
* @see java.awt.VerticalFlowLayout#setAlignment
* @since JDK1.1
*/
public int getAlignment()
{
return align;
}
/**
* Sets the alignment for this layout. Possible values are
* <ul>
* <li><code>VerticalFlowLayout.TOP</code>
* <li><code>VerticalFlowLayout.BOTTOM</code>
* <li><code>VerticalFlowLayout.CENTER</code>
* </ul>
* @param align one of the alignment values shown above
* @see #getAlignment()
* @since JDK1.1
*/
public void setAlignment(int align)
{
this.align = align;
}
/**
* Gets the horizontal gap between components
* and between the components and the borders
* of the <code>Container</code>
*
* @return the horizontal gap between components
* and between the components and the borders
* of the <code>Container</code>
* @see java.awt.VerticalFlowLayout#setHgap
* @since JDK1.1
*/
public int getHgap() {
return hgap;
}
/**
* Sets the horizontal gap between components and
* between the components and the borders of the
* <code>Container</code>.
*
* @param hgap the horizontal gap between components
* and between the components and the borders
* of the <code>Container</code>
* @see java.awt.VerticalFlowLayout#getHgap
* @since JDK1.1
*/
public void setHgap(int hgap) {
this.hgap = hgap;
}
/**
* Gets the vertical gap between components and
* between the components and the borders of the
* <code>Container</code>.
*
* @return the vertical gap between components
* and between the components and the borders
* of the <code>Container</code>
* @see java.awt.VerticalFlowLayout#setVgap
* @since JDK1.1
*/
public int getVgap() {
return vgap;
}
/**
* Sets the vertical gap between components and between
* the components and the borders of the <code>Container</code>.
*
* @param vgap the vertical gap between components
* and between the components and the borders
* of the <code>Container</code>
* @see java.awt.VerticalFlowLayout#getVgap
*/
public void setVgap(int vgap) {
this.vgap = vgap;
}
/**
* Adds the specified component to the layout.
* Not used by this class.
* @param name the name of the component
* @param comp the component to be added
*/
public void addLayoutComponent(String name, Component comp) {
}
/**
* Removes the specified component from the layout.
* Not used by this class.
* @param comp the component to remove
* @see java.awt.Container#removeAll
*/
public void removeLayoutComponent(Component comp) {
}
/**
* Returns the preferred dimensions for this layout given the
* <i>visible</i> components in the specified target container.
*
* @param target the container that needs to be laid out
* @return the preferred dimensions to lay out the
* subcomponents of the specified container
* @see Container
* @see #minimumLayoutSize
* @see java.awt.Container#getPreferredSize
*/
public Dimension preferredLayoutSize(Container target)
{
synchronized (target.getTreeLock())
{
Dimension dim = new Dimension(0, 0);
int nmembers = target.getComponentCount();
boolean firstVisibleComponent = true;
for (int i = 0 ; i < nmembers ; i++)
{
Component m = target.getComponent(i);
if (m.isVisible())
{
Dimension d = m.getPreferredSize();
dim.width = Math.max(dim.width, d.width);
if (firstVisibleComponent)
{
firstVisibleComponent = false;
}
else
{
dim.height += vgap;
}
dim.height += d.height;
}
}
Insets insets = target.getInsets();
dim.width += insets.left + insets.right + hgap*2;
dim.height += insets.top + insets.bottom + vgap*2;
return dim;
}
}
/**
* Returns the minimum dimensions needed to layout the <i>visible</i>
* components contained in the specified target container.
* @param target the container that needs to be laid out
* @return the minimum dimensions to lay out the
* subcomponents of the specified container
* @see #preferredLayoutSize
* @see java.awt.Container
* @see java.awt.Container#doLayout
*/
public Dimension minimumLayoutSize(Container target)
{
synchronized (target.getTreeLock())
{
Dimension dim = new Dimension(0, 0);
int nmembers = target.getComponentCount();
boolean firstVisibleComponent = true;
for (int i = 0 ; i < nmembers ; i++)
{
Component m = target.getComponent(i);
if (m.isVisible())
{
Dimension d = m.getMinimumSize();
dim.width = Math.max(dim.width, d.width);
if (firstVisibleComponent)
{
firstVisibleComponent = false;
}
else
{
dim.height += vgap;
}
dim.height += d.height;
}
}
Insets insets = target.getInsets();
dim.width += insets.left + insets.right + hgap*2;
dim.height += insets.top + insets.bottom + vgap*2;
return dim;
}
}
/**
* Lays out the container. This method lets each
* <i>visible</i> component take
* its preferred size by reshaping the components in the
* target container in order to satisfy the alignment of
* this <code>VerticalFlowLayout</code> object.
*
* @param target the specified component being laid out
* @see Container
* @see java.awt.Container#doLayout
*/
public void layoutContainer(Container target)
{
synchronized (target.getTreeLock())
{
Insets insets = target.getInsets();
int maxHeight = target.getSize().height - (insets.top + insets.bottom + vgap*2);
int nmembers = target.getComponentCount();
int x = insets.left + hgap;
int y = 0;
int columnWidth = 0;
int start = 0;
boolean ttb = target.getComponentOrientation().isLeftToRight();
for (int i = 0 ; i < nmembers ; i++)
{
Component m = target.getComponent(i);
if (m.isVisible())
{
Dimension d = m.getPreferredSize();
m.setSize(d.width, d.height);
if ((y == 0) || ((y + d.height) <= maxHeight))
{
if (y > 0)
{
y += vgap;
}
y += d.height;
columnWidth = Math.max(columnWidth, d.width);
}
else
{
moveComponents(target, x, insets.top + vgap, columnWidth, maxHeight - y, start, i, ttb);
y = d.height;
x += hgap + columnWidth;
columnWidth = d.width;
start = i;
}
}
}
moveComponents(target, x, insets.top + vgap, columnWidth, maxHeight - y, start, nmembers, ttb);
}
}
/**
* Centers the elements in the specified row, if there is any slack.
* @param target the component which needs to be moved
* @param x the x coordinate
* @param y the y coordinate
* @param width the width dimensions
* @param height the height dimensions
* @param columnStart the beginning of the column
* @param columnEnd the the ending of the column
*/
private void moveComponents(
Container target, int x, int y, int width, int height, int columnStart, int columnEnd, boolean ttb)
{
switch (align)
{
case TOP:
y += ttb ? 0 : height;
break;
case CENTER:
y += height / 2;
break;
case BOTTOM:
y += ttb ? height : 0;
break;
}
for (int i = columnStart ; i < columnEnd ; i++)
{
Component m = target.getComponent(i);
if (m.isVisible())
{
int cx;
cx = x + (width - m.getSize().width) / 2;
if (ttb)
{
m.setLocation(cx, y);
}
else
{
m.setLocation(cx, target.getSize().height - y - m.getSize().height);
}
y += m.getSize().height + vgap;
}
}
}
/**
* Returns a string representation of this <code>VerticalFlowLayout</code>
* object and its values.
* @return a string representation of this layout
*/
public String toString()
{
String str = "";
switch (align)
{
case TOP: str = ",align=top"; break;
case CENTER: str = ",align=center"; break;
case BOTTOM: str = ",align=bottom"; break;
}
return getClass().getName() + "[hgap=" + hgap + ",vgap=" + vgap + str + "]";
}
public static void main(String[] args)
{
JPanel main = new JPanel( new BorderLayout() );
final JPanel buttons = new JPanel(new VerticalFlowLayout() );
// buttons.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
main.add(buttons, BorderLayout.CENTER);
for (int i = 0; i < 7; i++)
{
buttons.add( new JRadioButton("button " + i) );
}
JButton button = new JButton("Add Radio Button");
main.add(button, BorderLayout.SOUTH);
button.addActionListener( new ActionListener()
{
private int i = 8;
public void actionPerformed(ActionEvent e)
{
buttons.add( new JRadioButton("button R Us" + i++) );
buttons.revalidate();
// pack();
}
});
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(main);
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
Теоретически вы должны иметь возможность использовать WrapLayout и расширять этот класс, а затем настраивать код, который также должен быть вертикально ориентирован.
Edit:
У меня есть WrapLayout, расширяющий VerticalFlowLayout как таковой:
Вы не можете просто расширить VerticalFlowLayout. Код WrapLayout предназначен для вычисления фиксированной ширины в зависимости от размера родительского контейнера. Вам нужно изменить поведение, чтобы вычислить фиксированную высоту. Я не пробовал, но в основном вам нужно было бы изменить ссылки на переменную "width" на ссылки "height" и "height", связанные с "width", чтобы код работал на вертикальном измерении вместо горизонтального измерения.
