c# 控件移动 改变大小

1. using System;
2. using System.Collections.Generic;
3. using System.Text;
4. using System.ComponentModel;
5. using System.Data;
6. using System.Drawing;
7. using System.Windows.Forms;
8.  
9. namespace AllTest
10. {
11. class BarcodeControl
12. {
13. #region private
14.  
15. private const int MIN_SIZE = 10; //对控件缩放的最小值
16. private const int BOX_SIZE = 7; //调整大小触模柄方框大小
17.  
18. public bool _IsCtrlKey = false;
19. private TextBox _textbox;
20. private Control _MControl = null;
21. private bool _IsMouseDown = false;
22. private Point _oPointClicked;
23. private Color BOX_COLOR = Color.White;
24. private Label[] _lbl = new Label[8];
25. private int _startl, _startt, _startw, _starth;
26. private bool _dragging;
27. private Cursor[] _arrArrow = new Cursor[] {Cursors.SizeNWSE, Cursors.SizeNS,
28. Cursors.SizeNESW, Cursors.SizeWE, Cursors.SizeNWSE, Cursors.SizeNS,
29. Cursors.SizeNESW, Cursors.SizeWE};
30.  
31. #endregion
32.  
33. #region 构造函数
34.  
35. /// <summary>
36. /// 构造控件拖动对象
37. /// </summary>
38. /// <param name="moveControl">需要拖动的控件 </param>
39. public BarcodeControl(Control moveControl)
40. {
41. //
42. // TODO: 在此处添加构造函数逻辑
43. //
44. _MControl = moveControl;
45. _MControl.MouseDown += new MouseEventHandler(this.Control_MouseDown);
46. _MControl.MouseUp += new MouseEventHandler(this.Control_MouseUp);
47. _MControl.MouseMove += new MouseEventHandler(this.Control_MouseMove);
48. _MControl.Click += new System.EventHandler(this.Control_Click);
49.  
50. //构造8个调整大小触模柄
51. for (int i = 0; i < 8; i++)
52. {
53. _lbl[i] = new Label();
54. _lbl[i].TabIndex = i;
55. _lbl[i].FlatStyle = 0;
56. _lbl[i].BorderStyle = BorderStyle.FixedSingle;
57. _lbl[i].BackColor = BOX_COLOR;
58. _lbl[i].Cursor = _arrArrow[i];
59. _lbl[i].Text = "";
60. _lbl[i].BringToFront();
61. _lbl[i].MouseDown += new MouseEventHandler(this.handle_MouseDown);
62. _lbl[i].MouseMove += new MouseEventHandler(this.handle_MouseMove);
63. _lbl[i].MouseUp += new MouseEventHandler(this.handle_MouseUp);
64. }
65.  
66. CreateTextBox();
67. Create();
68.  
69. //Control_Click((object)sender, (System.EventArgs)e);
70. }
71.  
72. #endregion
73.  
74. #region 需拖动控件键盘事件
75.  
76. private void textBox_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
77. {
78. if (e.KeyValue == 37 || e.KeyValue == 38 || e.KeyValue == 39 || e.KeyValue == 40)
79. {
80. if (e.KeyValue == 37)
81. _MControl.Left -= 1;
82. if (e.KeyValue == 38)
83. _MControl.Top -= 1;
84. if (e.KeyValue == 39)
85. _MControl.Left += 1;
86. if (e.KeyValue == 40)
87. _MControl.Top += 1;
88. MoveHandles();
89. ControlLocality();
90. _MControl.Visible = true;
91. }
92.  
93. if (e.KeyValue == 46)
94. {
95. for (int i = 0; i < 8; i++)
96. {
97. _MControl.Parent.Controls.Remove(_lbl[i]);
98. }
99. _MControl.Parent.Controls.Remove(_MControl);
100. _textbox.Parent.Controls.Remove(_textbox);
101. }
102.  
103. if (e.KeyValue == 17)
104. {
105. _IsCtrlKey = true;
106. //MessageBox.Show("a");
107. }
108. }
109.  
110. #endregion
111.  
112. #region 需拖动控件鼠标事件
113.  
114. private void Control_Click(object sender, System.EventArgs e)
115. {
116. _textbox.Focus();
117. _MControl = (sender as Control);
118. MoveHandles();
119.  
120. if (_IsCtrlKey == false)
121. {
122. for (int i = 0; i < _MControl.Parent.Controls.Count; i++)
123. {
124. if (_MControl.Parent.Controls[i].Text.Trim().Length == 0 && _MControl.Parent.Controls[i] is Label)
125. {
126. _MControl.Parent.Controls[i].Visible = false;
127. }
128. }
129. }
130. }
131. private void Control_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
132. {
133. _IsMouseDown = true;
134. _oPointClicked = new Point(e.X, e.Y);
135. for (int i = 0; i < 8; i++)
136. {
137. _MControl.Parent.Controls.Add(_lbl[i]);
138. _lbl[i].BringToFront();
139. }
140. HideHandles();
141. }
142.  
143. private void Control_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
144. {
145. _IsMouseDown = false;
146. MoveHandles();
147. ShowHandles();
148. _MControl.Visible = true;
149. }
150.  
151. private void Control_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
152. {
153. if (_IsMouseDown)
154. {
155. int l = _MControl.Left + (e.X - _oPointClicked.X);
156. int t = _MControl.Top + (e.Y - _oPointClicked.Y);
157. int w = _MControl.Width;
158. int h = _MControl.Height;
159. l = (l < 0) ? 0 : ((l + w > _MControl.Parent.ClientRectangle.Width) ?
160. _MControl.Parent.ClientRectangle.Width - w : l);
161. t = (t < 0) ? 0 : ((t + h > _MControl.Parent.ClientRectangle.Height) ?
162. _MControl.Parent.ClientRectangle.Height - h : t);
163. _MControl.Left = l;
164. _MControl.Top = t;
165. ControlLocality();
166. }
167. //_MControl.Cursor=Cursors.SizeAll;
168. }
169.  
170. #endregion
171. #region 调整大小触模柄鼠标事件
172.  
173. private void handle_MouseDown(object sender, MouseEventArgs e)
174. {
175. _dragging = true;
176. _startl = _MControl.Left;
177. _startt = _MControl.Top;
178. _startw = _MControl.Width;
179. _starth = _MControl.Height;
180. HideHandles();
181. }
182. // 通过触模柄调整控件大小
183. // 0 1 2
184. // 7 3
185. // 6 5 4
186. private void handle_MouseMove(object sender, MouseEventArgs e)
187. {
188. int l = _MControl.Left;
189. int w = _MControl.Width;
190. int t = _MControl.Top;
191. int h = _MControl.Height;
192. if (_dragging)
193. {
194. switch (((Label)sender).TabIndex)
195. {
196. //l算法：控件左边X坐标 ＋ 鼠标在触模柄X坐标 < 控件左边X坐标 ＋ 父控件宽度 - 控件大小 ？控件左边X坐标 ＋ 鼠标在触模柄X坐标 ：控件左边X坐标 ＋ 父控件宽度 - 控件大小
197. //t算法：
198. //w算法：
199. //h算法：
200. case 0: // _dragging top-left sizing box
201. l = _startl + e.X < _startl + _startw - MIN_SIZE ? _startl + e.X : _startl + _startw - MIN_SIZE;
202. t = _startt + e.Y < _startt + _starth - MIN_SIZE ? _startt + e.Y : _startt + _starth - MIN_SIZE;
203. w = _startl + _startw - _MControl.Left;
204. h = _startt + _starth - _MControl.Top;
205. break;
206. case 1: // _dragging top-center sizing box
207. t = _startt + e.Y < _startt + _starth - MIN_SIZE ? _startt + e.Y : _startt + _starth - MIN_SIZE;
208. h = _startt + _starth - _MControl.Top;
209. break;
210. case 2: // _dragging top-right sizing box
211. w = _startw + e.X > MIN_SIZE ? _startw + e.X : MIN_SIZE;
212. t = _startt + e.Y < _startt + _starth - MIN_SIZE ? _startt + e.Y : _startt + _starth - MIN_SIZE;
213. h = _startt + _starth - _MControl.Top;
214. break;
215. case 3: // _dragging right-middle sizing box
216. w = _startw + e.X > MIN_SIZE ? _startw + e.X : MIN_SIZE;
217. break;
218. case 4: // _dragging right-bottom sizing box
219. w = _startw + e.X > MIN_SIZE ? _startw + e.X : MIN_SIZE;
220. h = _starth + e.Y > MIN_SIZE ? _starth + e.Y : MIN_SIZE;
221. break;
222. case 5: // _dragging center-bottom sizing box
223. h = _starth + e.Y > MIN_SIZE ? _starth + e.Y : MIN_SIZE;
224. break;
225. case 6: // _dragging left-bottom sizing box
226. l = _startl + e.X < _startl + _startw - MIN_SIZE ? _startl + e.X : _startl + _startw - MIN_SIZE;
227. w = _startl + _startw - _MControl.Left;
228. h = _starth + e.Y > MIN_SIZE ? _starth + e.Y : MIN_SIZE;
229. break;
230. case 7: // _dragging left-middle sizing box
231. l = _startl + e.X < _startl + _startw - MIN_SIZE ? _startl + e.X : _startl + _startw - MIN_SIZE;
232. w = _startl + _startw - _MControl.Left;
233. break;
234. }
235. l = (l < 0) ? 0 : l;
236. t = (t < 0) ? 0 : t;
237. _MControl.SetBounds(l, t, w, h);
238. }
239. }
240.  
241. private void handle_MouseUp(object sender, MouseEventArgs e)
242. {
243. _dragging = false;
244. MoveHandles();
245. ShowHandles();
246. }
247.  
248. #endregion
249.  
250. #region private方法
251.  
252. private void Create()
253. {
254. //_IsMouseDown = true;
255. //_oPointClicked = new Point(e.X,e.Y);
256. for (int i = 0; i < 8; i++)
257. {
258. _MControl.Parent.Controls.Add(_lbl[i]);
259. _lbl[i].BringToFront();
260. }
261. HideHandles();
262. }
263.  
264. private void CreateTextBox()
265. {
266. _textbox = new TextBox();
267. _textbox.CreateControl();
268. _textbox.Parent = _MControl.Parent;
269. _textbox.Width = 0;
270. _textbox.Height = 0;
271. _textbox.TabStop = true;
272. _textbox.KeyDown += new System.Windows.Forms.KeyEventHandler(textBox_KeyDown);
273. }
274.  
275. private void ControlLocality()
276. {
277. if (_MControl.Location.X < 0)
278. {
279. _MControl.Visible = false;
280. _MControl.Left = 0;
281. }
282. if (_MControl.Location.Y < 0)
283. {
284. _MControl.Visible = false;
285. _MControl.Top = 0;
286. }
287. if (_MControl.Location.X + _MControl.Width > _MControl.Parent.Width)
288. {
289. _MControl.Visible = false;
290. _MControl.Left = _MControl.Parent.Width - _MControl.Width;
291. }
292. if (_MControl.Location.Y + _MControl.Height > _MControl.Parent.Height)
293. {
294. _MControl.Visible = false;
295. _MControl.Top = _MControl.Parent.Height - _MControl.Height;
296. }
297. }
298.  
299. private void HideHandles()
300. {
301. for (int i = 0; i < 8; i++)
302. {
303. _lbl[i].Visible = false;
304. }
305. }
306.  
307. private void MoveHandles()
308. {
309. int sX = _MControl.Left - BOX_SIZE;
310. int sY = _MControl.Top - BOX_SIZE;
311. int sW = _MControl.Width + BOX_SIZE;
312. int sH = _MControl.Height + BOX_SIZE;
313. int hB = BOX_SIZE / 2;
314. int[] arrPosX = new int[] {sX+hB, sX + sW / 2, sX + sW-hB, sX + sW-hB,
315. sX + sW-hB, sX + sW / 2, sX+hB, sX+hB};
316. int[] arrPosY = new int[] {sY+hB, sY+hB, sY+hB, sY + sH / 2, sY + sH-hB,
317. sY + sH-hB, sY + sH-hB, sY + sH / 2};
318. for (int i = 0; i < 8; i++)
319. {
320. _lbl[i].SetBounds(arrPosX[i], arrPosY[i], BOX_SIZE, BOX_SIZE);
321. }
322. }
323.  
324. private void ShowHandles()
325. {
326. if (_MControl != null)
327. {
328. for (int i = 0; i < 8; i++)
329. {
330. _lbl[i].Visible = true;
331. }
332. }
333. }
334.  
335. #endregion
336. }
337. }

 出处：http://www.cnblogs.com/ln_leo/articles/1723985.html