1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.util;
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3 |
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4 | import java.awt.Component;
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5 | import java.awt.Container;
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6 | import java.awt.Dimension;
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7 | import java.awt.FlowLayout;
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8 | import java.awt.Insets;
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9 | import java.util.function.Function;
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10 |
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11 | /**
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12 | * This is an extension of the flow layout that preferes wrapping the text instead of increasing the component width
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13 | * when there is not enough space.
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14 | * <p>
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15 | * This allows for a better preffered size computation.
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16 | * It should be used in all places where a flow layout fills the full width of the parent container.
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17 | * <p>
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18 | * This does not support baseline alignment.
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19 | * @author Michael Zangl
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20 | * @since 10622
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21 | */
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22 | public class MultiLineFlowLayout extends FlowLayout {
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23 | /**
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24 | * Same as {@link FlowLayout#FlowLayout()}
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25 | */
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26 | public MultiLineFlowLayout() {
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27 | super();
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28 | }
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29 |
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30 | /**
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31 | * Same as {@link FlowLayout#FlowLayout(int, int, int)}
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32 | * @param align Alignment
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33 | * @param hgap horizontal gap
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34 | * @param vgap vertical gap
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35 | */
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36 | public MultiLineFlowLayout(int align, int hgap, int vgap) {
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37 | super(align, hgap, vgap);
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38 | }
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39 |
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40 | /**
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41 | * Same as {@link FlowLayout#FlowLayout(int)}
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42 | * @param align Alignment
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43 | */
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44 | public MultiLineFlowLayout(int align) {
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45 | super(align);
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46 | }
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47 |
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48 | @Override
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49 | public Dimension preferredLayoutSize(Container target) {
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50 | return getLayoutSize(target, Component::getPreferredSize);
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51 | }
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52 |
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53 | @Override
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54 | public Dimension minimumLayoutSize(Container target) {
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55 | return getLayoutSize(target, Component::getMinimumSize);
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56 | }
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57 |
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58 | private Dimension getLayoutSize(Container target, Function<Component, Dimension> baseSize) {
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59 | synchronized (target.getTreeLock()) {
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60 | int outerWidth = getWidthOf(target);
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61 |
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62 | Insets insets = target.getInsets();
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63 | int containerWidth = outerWidth - insets.left - insets.right - getHgap() * 2;
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64 |
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65 | int x = 0;
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66 | int totalHeight = insets.top + insets.bottom + getVgap() * 2;
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67 | int rowHeight = 0;
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68 | for (int i = 0; i < target.getComponentCount(); i++) {
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69 | Component child = target.getComponent(i);
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70 | if (!child.isVisible()) {
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71 | continue;
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72 | }
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73 | Dimension size = baseSize.apply(child);
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74 | if (x != 0) {
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75 | x += getHgap();
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76 | }
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77 | x += size.width;
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78 | if (x > containerWidth) {
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79 | totalHeight += rowHeight + getVgap();
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80 | rowHeight = 0;
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81 | x = 0;
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82 | }
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83 |
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84 | rowHeight = Math.max(rowHeight, size.height);
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85 | }
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86 | totalHeight += rowHeight;
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87 |
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88 | return new Dimension(outerWidth, totalHeight);
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89 | }
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90 | }
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91 |
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92 | private static int getWidthOf(Container target) {
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93 | Container current = target;
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94 | while (current.getWidth() == 0 && current.getParent() != null) {
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95 | current = current.getParent();
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96 | }
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97 | int width = current.getWidth();
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98 | if (width == 0) {
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99 | return Integer.MAX_VALUE;
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100 | } else {
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101 | return width;
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102 | }
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103 | }
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104 |
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105 | @Override
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106 | public String toString() {
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107 | return "MultiLineFlowLayout [align=" + getAlignment() + ']';
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108 | }
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109 | }
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