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1
20
21 package JFlex.gui;
22
23 import java.awt.*;
24 import java.util.*;
25
26
33 public class GridPanel extends Panel implements Handles {
34
35 private int cols;
36 private int rows;
37
38 private int hgap;
39 private int vgap;
40
41 private Vector constraints = new Vector();
42 private Insets insets = new Insets(0,0,0,0);
43
44 public GridPanel(int cols, int rows) {
45 this(cols, rows, 0, 0);
46 }
47
48 public GridPanel(int cols, int rows, int hgap, int vgap) {
49 this.cols = cols;
50 this.rows = rows;
51 this.hgap = hgap;
52 this.vgap = vgap;
53 }
54
55 public void doLayout() {
56 Dimension size = getSize();
57 size.height -= insets.top+insets.bottom;
58 size.width -= insets.left+insets.right;
59
60 float cellWidth = size.width/cols;
61 float cellHeight = size.height/rows;
62
63 for (int i = 0; i < constraints.size(); i++) {
64 GridPanelConstraint c = (GridPanelConstraint) constraints.elementAt(i);
65
66 float x = cellWidth * c.x + insets.left + hgap/2;
67 float y = cellHeight * c.y + insets.right + vgap/2;
68
69 float width, height;
70
71 if (c.handle == FILL) {
72 width = (cellWidth-hgap) * c.width;
73 height = (cellHeight-vgap) * c.height;
74 }
75 else {
76 Dimension d = c.component.getPreferredSize();
77 width = d.width;
78 height = d.height;
79 }
80
81 switch (c.handle) {
82 case TOP_CENTER:
83 x+= (cellWidth+width)/2;
84 break;
85 case TOP_RIGHT:
86 x+= cellWidth-width;
87 break;
88 case CENTER_LEFT:
89 y+= (cellHeight+height)/2;
90 break;
91 case CENTER:
92 x+= (cellWidth+width)/2;
93 y+= (cellHeight+height)/2;
94 break;
95 case CENTER_RIGHT:
96 y+= (cellHeight+height)/2;
97 x+= cellWidth-width;
98 break;
99 case BOTTOM:
100 y+= cellHeight-height;
101 break;
102 case BOTTOM_CENTER:
103 x+= (cellWidth+width)/2;
104 y+= cellHeight-height;
105 break;
106 case BOTTOM_RIGHT:
107 y+= cellHeight-height;
108 x+= cellWidth-width;
109 break;
110 }
111
112 c.component.setBounds(new Rectangle((int)x, (int)y, (int)width, (int)height));
113 }
114 }
115
116 public Dimension getPreferredSize() {
117 float dy = 0;
118 float dx = 0;
119
120 for (int i = 0; i < constraints.size(); i++) {
121 GridPanelConstraint c = (GridPanelConstraint) constraints.elementAt(i);
122
123 Dimension d = c.component.getPreferredSize();
124
125 dx = Math.max(dx, d.width/c.width);
126 dy = Math.max(dy, d.height/c.height);
127 }
128
129 dx+= hgap;
130 dy+= vgap;
131
132 dx*= cols;
133 dy*= rows;
134
135 dx+= insets.left+insets.right;
136 dy+= insets.top+insets.bottom;
137
138 return new Dimension((int)dx,(int)dy);
139 }
140
141 public void setInsets(Insets insets) {
142 this.insets = insets;
143 }
144
145 public void add(int x, int y, Component c) {
146 add(x,y,1,1,FILL,c);
147 }
148
149 public void add(int x, int y, int handle, Component c) {
150 add(x,y,1,1,handle,c);
151 }
152
153 public void add(int x, int y, int dx, int dy, Component c) {
154 add(x,y,dx,dy,FILL,c);
155 }
156
157 public void add(int x, int y, int dx, int dy, int handle, Component c) {
158 super.add(c);
159 constraints.addElement(new GridPanelConstraint(x,y,dx,dy,handle,c));
160 }
161 }
162 |
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