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Java wrap layout (to swing library)
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| import java.awt.*; | |
| import javax.swing.JScrollPane; | |
| import javax.swing.SwingUtilities; | |
| public class WrapLayout extends FlowLayout | |
| { | |
| private Dimension preferredLayoutSize; | |
| public WrapLayout() | |
| { | |
| super(); | |
| } | |
| public WrapLayout(int align) | |
| { | |
| super(align); | |
| } | |
| public WrapLayout(int align, int hgap, int vgap) | |
| { | |
| super(align, hgap, vgap); | |
| } | |
| @Override | |
| public Dimension preferredLayoutSize(Container target) | |
| { | |
| return layoutSize(target, true); | |
| } | |
| @Override | |
| public Dimension minimumLayoutSize(Container target) | |
| { | |
| Dimension minimum = layoutSize(target, false); | |
| minimum.width -= (getHgap() + 1); | |
| return minimum; | |
| } | |
| private Dimension layoutSize(Container target, boolean preferred) | |
| { | |
| synchronized (target.getTreeLock()) | |
| { | |
| int targetWidth = target.getSize().width; | |
| if (targetWidth == 0) | |
| targetWidth = Integer.MAX_VALUE; | |
| int hgap = getHgap(); | |
| int vgap = getVgap(); | |
| Insets insets = target.getInsets(); | |
| int horizontalInsetsAndGap = insets.left + insets.right + (hgap * 2); | |
| int maxWidth = targetWidth - horizontalInsetsAndGap; | |
| Dimension dim = new Dimension(0, 0); | |
| int rowWidth = 0; | |
| int rowHeight = 0; | |
| int nmembers = target.getComponentCount(); | |
| for (int i = 0; i < nmembers; i++) | |
| { | |
| Component m = target.getComponent(i); | |
| if (m.isVisible()) | |
| { | |
| Dimension d = preferred ? m.getPreferredSize() : m.getMinimumSize(); | |
| if (rowWidth + d.width > maxWidth) | |
| { | |
| addRow(dim, rowWidth, rowHeight); | |
| rowWidth = 0; | |
| rowHeight = 0; | |
| } | |
| if (rowWidth != 0) | |
| { | |
| rowWidth += hgap; | |
| } | |
| rowWidth += d.width; | |
| rowHeight = Math.max(rowHeight, d.height); | |
| } | |
| } | |
| addRow(dim, rowWidth, rowHeight); | |
| dim.width += horizontalInsetsAndGap; | |
| dim.height += insets.top + insets.bottom + vgap * 2; | |
| Container scrollPane = SwingUtilities.getAncestorOfClass(JScrollPane.class, target); | |
| if (scrollPane != null) | |
| { | |
| dim.width -= (hgap + 1); | |
| } | |
| return dim; | |
| } | |
| } | |
| private void addRow(Dimension dim, int rowWidth, int rowHeight) | |
| { | |
| dim.width = Math.max(dim.width, rowWidth); | |
| if (dim.height > 0) | |
| { | |
| dim.height += getVgap(); | |
| } | |
| dim.height += rowHeight; | |
| } | |
| } |
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