1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import java.awt.Component;
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5 | import java.awt.Dimension;
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6 | import java.awt.GridBagConstraints;
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7 | import java.awt.Insets;
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8 |
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9 | import javax.swing.Box;
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10 |
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11 | /**
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12 | * A wrapper for GridBagConstraints which has sane default static creators and
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13 | * member functions to chain calling.
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14 | *
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15 | * @author imi
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16 | */
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17 | public final class GBC extends GridBagConstraints {
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18 |
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19 | /**
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20 | * Use public static creator functions to create an GBC.
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21 | */
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22 | private GBC() {}
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23 |
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24 | /**
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25 | * Create a standard constraint (which is not the last).
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26 | * @return A standard constraint with no filling.
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27 | */
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28 | public static GBC std() {
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29 | GBC c = new GBC();
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30 | c.anchor = WEST;
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31 | return c;
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32 | }
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33 |
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34 | /**
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35 | * Create the constraint for the last elements on a line.
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36 | * @return A constraint which indicates the last item on a line.
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37 | */
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38 | public static GBC eol() {
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39 | GBC c = std();
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40 | c.gridwidth = REMAINDER;
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41 | return c;
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42 | }
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43 |
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44 | /**
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45 | * Create the constraint for the last elements on a line and on a paragraph.
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46 | * This is merely a shortcut for eol().insets(0,0,0,10)
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47 | * @return A constraint which indicates the last item on a line.
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48 | */
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49 | public static GBC eop() {
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50 | return eol().insets(0,0,0,10);
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51 | }
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52 |
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53 | /**
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54 | * Try to fill both, horizontal and vertical
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55 | * @return This constraint for chaining.
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56 | */
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57 | public GBC fill() {
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58 | return fill(BOTH);
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59 | }
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60 |
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61 | /**
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62 | * Set fill to the given value
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63 | * @param value The filling value, either NONE, HORIZONTAL, VERTICAL or BOTH
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64 | * @return This constraint for chaining.
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65 | */
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66 | public GBC fill(int value) {
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67 | fill = value;
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68 | if (value == HORIZONTAL || value == BOTH)
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69 | weightx = 1.0;
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70 | if (value == VERTICAL || value == BOTH)
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71 | weighty = 1.0;
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72 | return this;
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73 | }
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74 |
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75 | /**
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76 | * Set the anchor of this GBC to a.
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77 | * @param a The new anchor, e.g. GBC.CENTER or GBC.EAST.
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78 | * @return This constraint for chaining.
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79 | */
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80 | public GBC anchor(int a) {
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81 | anchor = a;
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82 | return this;
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83 | }
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84 |
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85 | /**
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86 | * Adds insets to this GBC.
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87 | * @param left The left space of the insets
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88 | * @param top The top space of the insets
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89 | * @param right The right space of the insets
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90 | * @param bottom The bottom space of the insets
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91 | * @return This constraint for chaining.
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92 | */
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93 | public GBC insets(int left, int top, int right, int bottom) {
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94 | insets = new Insets(top, left, bottom, right);
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95 | return this;
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96 | }
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97 |
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98 | /**
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99 | * Specifies how to distribute extra horizontal space.
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100 | * @param weightx Weight in horizontal direction
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101 | * @param weighty Weight in vertical direction
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102 | * @return This constraint for chaining.
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103 | */
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104 | public GBC weight(double weightx, double weighty) {
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105 | this.weightx = weightx;
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106 | this.weighty = weighty;
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107 | return this;
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108 | }
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109 |
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110 | /**
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111 | * This is a helper to easily create a glue with a minimum default value.
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112 | * @param x If higher than 0, this will be a horizontal glue with x as minimum
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113 | * horizontal strut.
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114 | * @param y If higher than 0, this will be a vertical glue with y as minimum
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115 | * vertical strut.
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116 | * @return the glue component
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117 | */
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118 | public static Component glue(int x, int y) {
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119 | short maxx = x > 0 ? Short.MAX_VALUE : 0;
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120 | short maxy = y > 0 ? Short.MAX_VALUE : 0;
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121 | return new Box.Filler(new Dimension(x,y), new Dimension(x,y), new Dimension(maxx,maxy));
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122 | }
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123 |
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124 | public GBC grid(int x, int y) {
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125 | gridx = x;
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126 | gridy = y;
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127 | return this;
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128 | }
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129 |
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130 | public GBC span(int width, int height) {
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131 | gridwidth = width;
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132 | gridheight = height;
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133 | return this;
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134 | }
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135 |
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136 | public GBC span(int width) {
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137 | gridwidth = width;
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138 | return this;
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139 | }
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140 |
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141 | public static GBC std(int x, int y) {
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142 | GBC c = new GBC();
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143 | c.anchor = WEST;
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144 | c.gridx = x;
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145 | c.gridy = y;
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146 | return c;
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147 | }
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148 |
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149 | }
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