本篇是接着上一篇写的，上一篇只是对按钮的前景色，背景色等做了一些改变，由于按钮的一个重要功能是本篇将涉及到鼠标事件，包括按下、抬起、经过、离开等事件。
修改上一篇的MyButton.cs文件即可：
1: using System;
2: using System.Windows;
3: using System.Windows.Forms;
4: using System.Drawing;
5:
6: namespace WindowsFormsApplication1
7: {
8: class MyButton:System.Windows.Forms.Button
9: {
10: private bool mouseDown = false;
11: private bool mouseHover = false;
12:
13: public MyButton()
14: {
15: SetStyle(ControlStyles.UserPaint, true);
16: MouseDown += new MouseEventHandler(OnMouseDown);
17: MouseUp += new MouseEventHandler(OnMouseUp);
18: MouseEnter += new EventHandler(OnMouseEnter);
19: MouseLeave += new EventHandler(OnMouseLeave);
20: Height = 23;
21: Width = 75;
22: }
23: private void OnMouseDown(object sender, MouseEventArgs e)
24: {
25: mouseDown = true;
26: }
27: private void OnMouseUp(object sender, MouseEventArgs e)
28: {
29: mouseDown = false;
30: OnPaint(new PaintEventArgs(CreateGraphics(), ClientRectangle));
31: }
32: private void OnMouseEnter(object sender, EventArgs e)
33: {
34: mouseHover = true;
35: OnPaint(new PaintEventArgs(CreateGraphics(), ClientRectangle));
36: }
37: private void OnMouseLeave(object sender, EventArgs e)
38: {
39: mouseHover = false;
40: OnPaint(new PaintEventArgs(CreateGraphics(), ClientRectangle));
41: }
42: protected override void OnPaint(PaintEventArgs pevent)
43: {
44: pevent.Graphics.FillRectangle(new SolidBrush(Parent.BackColor),
45: pevent.ClipRectangle);
46: if (Enabled == false)
47: {
48: DrawDisableButton(pevent.Graphics);
49: }
50: else if (mouseDown)
51: {
52: DrawMouseDownButton(pevent.Graphics);
53: }
54: else if (mouseHover)
55: {
56: DrawMouseHoverButton(pevent.Graphics);
57: }
58: else if (Focused)
59: {
60: DrawContainFocusButton(pevent.Graphics);
61: }
62: else
63: {
64: DrawNormalButton(pevent.Graphics);
65: }
66: WriteText(pevent.Graphics);
67: //base.OnPaint(pevent);
68: }
69:
70: private void DrawBorder(Graphics g, int state)
71: {
72: if (state == 1)//draw normal style border
73: {
74: Pen p = new Pen(SystemColors.ControlLightLight, 2);
75: g.DrawLine(p, 1, 1, 1, Height - 2);
76: g.DrawLine(p, 1, 1, Width - 2, 1);
77: g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
78: g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
79: }
80: else if (state == 2)//draw hover style border
81: {
82: Pen p = new Pen(Color.Yellow, 2);
83: g.DrawLine(p, 1, 1, 1, Height - 2);
84: g.DrawLine(p, 1, 1, Width - 2, 1);
85: g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
86: g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
87: }
88: else if (state == 3)//draw pressed style border
89: {
90: Pen p = new Pen(SystemColors.ControlDark, 2);
91: g.DrawLine(p, 1, 1, 1, Height - 2);
92: g.DrawLine(p, 1, 1, Width - 2, 1);
93: g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
94: g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
95: }
96: else if (state == 4)//draw disabled style border
97: {
98: Pen p = new Pen(SystemColors.ControlLight, 2);
99: g.DrawLine(p, 1, 1, 1, Height - 2);
100: g.DrawLine(p, 1, 1, Width - 2, 1);
101: g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
102: g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
103: }
104: else if (state == 5)//draw default style border
105: {
106: Pen p = new Pen(Color.SkyBlue, 2);
107: g.DrawLine(p, 1, 1, 1, Height - 2);
108: g.DrawLine(p, 1, 1, Width - 2, 1);
109: g.DrawLine(p, Width - 1, 2, Width - 1, Height - 2);
110: g.DrawLine(p, 2, Height - 1, Width - 2, Height - 1);
111: }
112: if (state == 4)//draw disable style border
113: {
114: Pen p = new Pen(Color.FromArgb(161, 161, 146), 1);
115: g.DrawLine(p, 0, 2, 0, Height - 3);
116: g.DrawLine(p, 2, 0, Width - 3, 0);
117: g.DrawLine(p, Width - 1, 2, Width - 1, Height - 3);
118: g.DrawLine(p, 2, Height - 1, Width - 3, Height - 1);
119: g.DrawLine(p, 0, 2, 2, 0);
120: g.DrawLine(p, 0, Height - 3, 2, Height - 1);
121: g.DrawLine(p, Width - 3, 0, Width - 1, 2);
122: g.DrawLine(p, Width - 3, Height - 1, Width - 1, Height - 3);
123: }
124: else//draw normal style border
125: {
126: g.DrawLine(Pens.Black, 0, 2, 0, Height - 3);
127: g.DrawLine(Pens.Black, 2, 0, Width - 3, 0);
128: g.DrawLine(Pens.Black, Width - 1, 2, Width - 1, Height - 3);
129: g.DrawLine(Pens.Black, 2, Height - 1, Width - 3, Height - 1);
130: g.DrawLine(Pens.Black, 0, 2, 2, 0);
131: g.DrawLine(Pens.Black, 0, Height - 3, 2, Height - 1);
132: g.DrawLine(Pens.Black, Width - 3, 0, Width - 1, 2);
133: g.DrawLine(Pens.Black, Width - 3, Height - 1,
134: Width - 1, Height - 3);
135: }
136: }
137:
138: private void DrawNormalButton(Graphics g)
139: {
140: DrawBorder(g, 1);
141: PaintBack(g, SystemColors.ControlLightLight);
142: }
143:
144: private void DrawMouseHoverButton(Graphics g)
145: {
146: DrawBorder(g, 2);
147: PaintBack(g, SystemColors.ControlLightLight);
148: }
149:
150: private void DrawMouseDownButton(Graphics g)
151: {
152: DrawBorder(g, 3);
153: PaintBack(g, SystemColors.ControlLight);
154: }
155:
156: private void DrawDisableButton(Graphics g)
157: {
158: DrawBorder(g, 4);
159: PaintBack(g, SystemColors.ControlLight);
160: }
161:
162: private void DrawContainFocusButton(Graphics g)
163: {
164: DrawBorder(g, 5);
165: PaintBack(g, SystemColors.ControlLightLight);
166: }
167:
168: private void PaintBack(Graphics g, Color c)
169: {
170: g.FillRectangle(new SolidBrush(c), 3, 3, Width - 6, Height-6);
171: }
172:
173: private void WriteText(Graphics g)
174: {
175: int x = 0, y = 0;
176: Size s = g.MeasureString(Text, Font).ToSize();
177: x = (Width - s.Width) / 2;
178: y = (Height - s.Height) / 2;
179: if (Enabled)
180: g.DrawString(Text, Font, Brushes.Black, x, y);
181: else
182: g.DrawString(Text, Font, Brushes.Gray, x, y);
183: }
184: }
185: }
窗体代码不变。
