1 public class RadioButton extends Canvas {
2
3 protected final Image RADIO_CHECKED = createImage("radiobutton_checked.png");
4 protected final Image RADIO_UNCHECKED = createImage("radiobutton_unchecked.png");
5
6 protected Image decrotorImage;//左侧图标
7 protected String text = "RadioButton";//默认文字
8 protected boolean selection;//选中状态
9 protected int imageSize = 16;//默认图标大小
10
11 private int mouse = 0;//鼠标状态
12 private boolean hit = false;//碰撞
13
14 /**
15 *
16 * @param parent
17 * @param style SWT.NONE
18 */
19 public RadioButton(Composite parent, int style) {
20
21 super(parent, style);
22 //默认未选中
23 setDecrotorImage(RADIO_UNCHECKED);
24
25 this.addPaintListener(new PaintListener() {
26
27 //绘制按钮
28 @Override
29 public void paintControl(PaintEvent e) {
30
31 Rectangle rect = getBounds();
32 Color foreground = getForeground();
33 Color background = getBackground();
34 Font font = getFont();
35
36 e.gc.setBackground(background);
37 e.gc.setForeground(foreground);
38 e.gc.setFont(font);
39
40 //图片垂直居中
41 int imgX = 2;
42 int imgY = (rect.height - imageSize) / 2;
43 e.gc.drawImage(getDecrotorImage(), imgX, imgY);
44
45 //文字垂直居中
46 FontMetrics fontMetrics = e.gc.getFontMetrics();
47 int padding = 2;
48 int txtX = imgX + getDecrotorImage().getBounds().width + padding;
49 int txtY = (rect.height - fontMetrics.getHeight()) / 2;
50 e.gc.drawText(getText(), txtX, txtY - 1);
51
52 e.gc.dispose();
53
54 }
55 });
56 this.addMouseListener(new MouseAdapter() {
57 @Override
58 public void mouseDown(MouseEvent e) {
59 hit = true;
60 mouse = 2;
61 // redraw();
62 }
63
64 @Override
65 public void mouseUp(MouseEvent e) {
66 hit = false;
67 mouse = 1;
68 if (e.x < 0 || e.y < 0 || e.x > getBounds().width || e.y > getBounds().height) {
69 mouse = 0;
70 }
71 if (mouse == 1) {
72 setSelection(true);
73 //触发重绘
74 redraw();
75 notifyListeners(SWT.Selection, new Event());
76 }
77 }
78 });
79 this.setCursor(new Cursor(this.getDisplay(), SWT.CURSOR_HAND));
80
81 }
82
83 private static Image createImage(String name) {
84 InputStream stream = RadioButton.class.getResourceAsStream(name);
85 Image image = new Image(null, stream);
86 try {
87 stream.close();
88 } catch (IOException ioe) {
89 }
90 return image;
91 }
92
93 public void setSelection(boolean selection) {
94 if (this.selection == selection) {
95 return;
96 }
97 this.selection = selection;
98 //设置互斥
99 if (selection) {
100 if (getParent() != null) {
101 Control[] controls = getParent().getChildren();
102 for (Control control : controls) {
103 if (control instanceof RadioButton) {
104 if (!(this == control))
105 ((RadioButton) control).setSelection(false);
106 }
107 }
108 }
109 }
110 setDecrotorImage(selection ? RADIO_CHECKED : RADIO_UNCHECKED);
111 redraw();
112 }
113
114 /**
115 * @param decrotorImage the decrotorImage to set
116 */
117 protected void setDecrotorImage(Image decrotorImage) {
118 //对图片进行缩放
119 ImageData imageData = decrotorImage.getImageData();
120 ImageData newImageData = imageData.scaledTo(imageSize, imageSize);
121 Image scaledImage = new Image(getDisplay(), newImageData);
122 this.decrotorImage = scaledImage;
123 }
124
125 /**
126 * @return the decrotorImage
127 */
128 protected Image getDecrotorImage() {
129 return decrotorImage;
130 }
131
132
133 /**
134 * @param text the text to set
135 */
136 public void setText(String text) {
137 this.text = text;
138 }
139
140
141 /**
142 * @return the text
143 */
144 public String getText() {
145 return text;
146 }
147
148 /**
149 * @return the selection
150 */
151 public boolean isSelection() {
152 return selection;
153 }
154
155 public int getImageSize() {
156 return imageSize;
157 }
158
159 public void setImageSize(int imageSize) {
160 this.imageSize = imageSize;
161 }
162
163 }
