c#创建不规则窗体一些细节

创建不规则窗体，最好的做法是覆盖 Form 本身的绘制，自己用代码重绘。很多时候没有必要这么做。下面说几个比较有用的技巧。当然在winform中使用透明控件重叠是个头疼的问题，采用双缓冲是不能解决问题的。目前使用的的增加淡入淡出效果，解决窗体重绘时控件闪烁问题。

 

1.FadeForm

 

View Code

  1 using System;
  2 
  3 using System.Drawing;
  4 
  5 using System.Windows.Forms;
  6 
  7 using SK.Common;
  8 
  9 
 10 
 11 namespace SK
 12 {
 13 
 14     /// <summary>
 15 
 16 /// 提供窗体的淡入淡出，此方式为了缓解窗体空间过多或者透明窗体叠加引起的过多重绘闪烁问题；
 17 
 18 /// 利用拦截WindowMessages，来进行相应的淡入淡出处理
 19 
 20 /// </summary>
 21 
 22     public partial class FadeForm : Form
 23     {
 24 
 25         #region Variables and Properties
 26 
 27         private double targetOpacity;//当前不透明度
 28 
 29         private double activeOpacity = 0.99;//活动时不透明度
 30 
 31         private double minimizedOpacity = 0;//最小化时的不透明度
 32 
 33 
 34 
 35 
 36 
 37         private double userMinOpacity = 0.001;//用户定义最小化窗体时不透明度
 38 
 39         private double closingOpacity = 0.0001;//用户定义关闭窗体时不透明度
 40 
 41 
 42 
 43         private double interval = 25;//计时器间隔
 44 
 45         private double duration = 200;//淡入或淡出 透明度改变持续时间， 
 46 
 47         private double fadeChangePerTick = 0;//  interval/duration 淡入淡出 透明度改变值
 48 
 49 
 50 
 51         private System.Windows.Forms.Timer timer;
 52 
 53 
 54 
 55         private Message heldMessage = new Message();
 56 
 57 
 58 
 59         public double TargetOpacity
 60         {
 61 
 62             set
 63             {
 64 
 65                 targetOpacity = value;
 66 
 67                 if (!timer.Enabled) timer.Start();
 68 
 69             }
 70 
 71             get { return targetOpacity; }
 72 
 73         }
 74 
 75 
 76 
 77         public double ActiveOpacity
 78         {
 79 
 80             get { return activeOpacity; }
 81 
 82             set
 83             {
 84 
 85                 if (value >= 0) activeOpacity = value;
 86 
 87                 else throw new ArgumentOutOfRangeException("The ActiveOpacity must be a positive value");
 88 
 89             }
 90 
 91         }
 92 
 93 
 94 
 95         public double MinimizedOpacity
 96         {
 97 
 98             get { return minimizedOpacity; }
 99 
100             set
101             {
102 
103                 if (value >= 0) minimizedOpacity = value;
104 
105                 else throw new ArgumentOutOfRangeException("The MinimizedOpacity must be a positive value");
106 
107             }
108 
109         }
110 
111 
112 
113         public double UserMinOpacity
114         {
115 
116             get { return userMinOpacity; }
117 
118             set
119             {
120 
121                 if (value >= 0) userMinOpacity = value;
122 
123                 else throw new ArgumentOutOfRangeException("The UserMinOpacity must be a positive value");
124 
125             }
126 
127         }
128 
129 
130 
131         public double ClosingOpacity
132         {
133 
134             get { return closingOpacity; }
135 
136             set
137             {
138 
139                 if (value >= 0) closingOpacity = value;
140 
141                 else throw new ArgumentOutOfRangeException("The ClosingOpacity must be a positive value");
142 
143             }
144 
145         }
146 
147 
148 
149         public double Interval
150         {
151 
152             get { return interval; }
153 
154             set
155             {
156 
157                 if (value >= 0) interval = value;
158 
159                 else throw new ArgumentOutOfRangeException("The Interval must be a positive value");
160 
161             }
162 
163         }
164 
165 
166 
167         public double Duration
168         {
169 
170             get { return duration; }
171 
172             set
173             {
174 
175                 if (value >= 0) duration = value;
176 
177                 else throw new ArgumentOutOfRangeException("The Duration must be a positive value");
178 
179             }
180 
181         }
182 
183         #endregion
184 
185 
186 
187         public FadeForm()
188         {
189 
190             this.timer = new System.Windows.Forms.Timer();
191 
192             this.SuspendLayout();
193 
194             this.timer.Interval = 25;
195 
196             this.Duration = Double.Parse(System.Configuration.ConfigurationManager.AppSettings["Duration"]);
197 
198             this.fadeChangePerTick = this.interval / this.duration;
199 
200             this.timer.Tick += new System.EventHandler(this.timer_Tick);
201 
202             this.Load += new System.EventHandler(this.FadeForm_Load);
203 
204         }
205 
206 
207 
208         #region WindowsMessage
209 
210 
211 
212         /// <summary>
213 
214 /// Intercepts WindowMessages before they are processed.
215 
216 /// </summary>
217 
218 /// <param name="m">Windows Message</param>
219 
220         protected override void WndProc(ref Message m)
221         {
222 
223             if (m.Msg == (int)WmEnum.WM_SYSCOMMAND || m.Msg == (int)WmEnum.WM_COMMAND)
224             {
225 
226                 if (m.WParam == (IntPtr)WmEnum.SC_MINIMIZE)
227                 {
228 
229                     if (heldMessage.WParam == (IntPtr)WmEnum.SC_MINIMIZE)
230                     {
231 
232                         heldMessage = new Message();
233 
234                         TargetOpacity = activeOpacity;
235 
236                     }
237 
238                     else
239                     {
240 
241                         heldMessage = m;
242 
243                         TargetOpacity = minimizedOpacity;
244 
245                     }
246 
247                     return;
248 
249                 }
250 
251                 else if (m.WParam == (IntPtr)WmEnum.SC_RESTORE
252 
253                     && this.WindowState == FormWindowState.Minimized)
254                 {
255 
256                     base.WndProc(ref m);
257 
258                     TargetOpacity = activeOpacity;
259 
260                     return;
261 
262                 }
263 
264                 else if (m.WParam == (IntPtr)WmEnum.SC_CLOSE)
265                 {
266 
267                     heldMessage = m;
268 
269                     TargetOpacity = minimizedOpacity;
270 
271                     return;
272 
273                 }
274 
275             }
276 
277 
278 
279             base.WndProc(ref m);
280 
281         }
282 
283         #endregion
284 
285 
286 
287         private void FadeForm_Load(object sender, EventArgs e)
288         {
289 
290             this.Opacity = minimizedOpacity;
291 
292             TargetOpacity = activeOpacity;
293 
294         }
295 
296 
297 
298         private void timer_Tick(object sender, EventArgs e)
299         {
300 
301             if (Math.Abs(targetOpacity - this.Opacity) < fadeChangePerTick)
302             {
303 
304                 if (targetOpacity == 1) this.Opacity = .999;
305 
306                 else this.Opacity = targetOpacity;
307 
308                 base.WndProc(ref heldMessage);
309 
310                 heldMessage = new Message();
311 
312                 timer.Stop();
313 
314                 if (targetOpacity == userMinOpacity)
315 
316                     this.WindowState = FormWindowState.Minimized;
317 
318                 if (targetOpacity == closingOpacity)
319 
320                     this.Close();
321 
322             }
323 
324             else if (targetOpacity > this.Opacity)
325 
326                 this.Opacity += fadeChangePerTick;
327 
328             else if (targetOpacity < this.Opacity)
329 
330                 this.Opacity -= fadeChangePerTick;
331 
332         }
333 
334     }
335 
336 }

 

2.当FormBorderStyle = System.Windows.Forms.FormBorderStyle.None时,应用程序在任务栏中无法弹出右键;下面通过调用API调出右键菜单:

 

 1         [DllImport("user32.dll", EntryPoint = "GetWindowLong", CharSet = CharSet.Auto)]
 2         public static extern int GetWindowLong(HandleRef hWnd, int nIndex);
 3         [DllImport("user32.dll", EntryPoint = "SetWindowLong", CharSet = CharSet.Auto)]
 4         public static extern IntPtr SetWindowLong(HandleRef hWnd, int nIndex, int dwNewLong);
 5 
 6 
 7             int WS_SYSMENU = 0x00080000; // 系统菜单
 8             int WS_MINIMIZEBOX = 0x20000; // 最大最小化按钮
 9             int windowLong = GetWindowLong(new HandleRef(this, this.Handle), -16);
10             SetWindowLong(new HandleRef(this, this.Handle), -16, windowLong | WS_MINIMIZEBOX | WS_SYSMENU)