上次貼了幾張圖片出來顯擺，這次徹底公布代碼~大家看看原理就好，有興趣的朋友可以和我聯系，把SWT里面的控件都封裝一下，做一套驗證框架出來~
1
package com.glnpu.dmp.controls;
2
3import org.eclipse.swt.SWT;
4import org.eclipse.swt.events.ControlEvent;
5import org.eclipse.swt.events.ControlListener;
6import org.eclipse.swt.events.ModifyEvent;
7import org.eclipse.swt.events.ModifyListener;
8import org.eclipse.swt.events.PaintEvent;
9import org.eclipse.swt.events.PaintListener;
10import org.eclipse.swt.graphics.GC;
11import org.eclipse.swt.graphics.Image;
12import org.eclipse.swt.widgets.Composite;
13import org.eclipse.swt.widgets.Display;
14import org.eclipse.swt.widgets.Text;
15
16
public class SuperText extends Composite implements PaintListener, ControlListener
{
17
18 private Text text;
19
20 private Image tempCorner;
21
22 private Image tempMsg;
23
24 private Image warning_corner;
25
26 private Image ok_corner;
27
28 private Image error_corner;
29
30 private Image msg_warning;
31
32 private Image msg_ok;
33
34 private Image msg_error;
35
36
/** *//**
37 * Create the composite
38 * @param parent
39 * @param style
40
*/
41 public SuperText(Composite parent, int style) {
42 super(parent, SWT.NONE);
43 initResource();
44 initControls(style);
45 this.addPaintListener(this);
46 this.addControlListener(this);
47 }
48
49 private void initResource() {
50 warning_corner = new Image(Display.getDefault(), "icons/input_warning_corner.gif");
51 ok_corner = new Image(Display.getDefault(), "icons/input_ok_corner.gif");
52 error_corner = new Image(Display.getDefault(), "icons/input_error_corner.gif");
53
54 msg_warning = new Image(Display.getDefault(), "icons/standard_msg_warning.gif");
55 msg_ok = new Image(Display.getDefault(), "icons/standard_msg_ok.gif");
56 msg_error = new Image(Display.getDefault(), "icons/standard_msg_error.gif");
57
58 tempCorner = warning_corner;
59 tempMsg = msg_warning;
60 }
61
62 private void initControls(int style) {
63 text = new Text(this, SWT.FLAT|style);
64 text.addModifyListener(new ModifyListener(){
65 public void modifyText(ModifyEvent e) {
66 if(SuperText.this.text.getText()!=null && !SuperText.this.text.getText().equals("")) {
67 if(SuperText.this.text.getText().length()>10) {
68 tempMsg = msg_ok;
69 tempCorner = ok_corner;
70 SuperText.this.redraw();
71 }else {
72 tempCorner = error_corner;
73 tempMsg = msg_error;
74 SuperText.this.redraw();
75 }
76
77 }else {
78 System.out.println("do here");
79 tempCorner = warning_corner;
80 tempMsg = msg_warning;
81 SuperText.this.redraw();
82 }
83 }
84 });
85 }
86
87 @Override
88 public void dispose() {
89 super.dispose();
90 }
91
92 @Override
93 protected void checkSubclass() {}
94
95 public void paintControl(PaintEvent e) {
96 System.out.println("paintControl");
97 GC gc = e.gc;
98 gc.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_WHITE));
99 gc.fillGradientRectangle(1, 1, this.getSize().x-11-tempMsg.getBounds().width, this.getSize().y-2, false);
100 gc.drawRectangle(1, 1, this.getSize().x-11-tempMsg.getBounds().width, this.getSize().y-2);
101
102 //set warning corner
103 gc.drawImage(tempCorner, this.getSize().x-11-tempMsg.getBounds().width-tempCorner.getBounds().width, this.getSize().y-2-tempCorner.getBounds().height);
104
105 //set msg warning
106 gc.drawImage(tempMsg, this.getSize().x-tempMsg.getBounds().width-5, 1);
107 gc.dispose();
108 }
109
110 public void controlMoved(ControlEvent e) {}
111
112 public void controlResized(ControlEvent e) {
113 text.setBounds(2, 2, this.getSize().x-12-tempMsg.getBounds().width-tempCorner.getBounds().width, this.getSize().y-3);
114 }
115
116
}
117
實現原理其實就是繪制！所謂自定義控件其實就是兩種，一種就是用C寫，然后JAVA調用，用SWT封裝；第二種就是繪制；第一種的做法其實并不好，會讓SWT的控件失去跨平臺性~一般的做法都是第二種。
大家可以看到整個類中沒有布局的出現，其實真的是“無布局才是最好的布局！”，沒有布局反倒更加的靈活了，方便談不上，但是靈活性大大提高；
Demo下載
客戶虐我千百遍，我待客戶如初戀！