（二十九）c#Winform自定义控件-文本框（二）
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2024-02-01 17:32:10
前提 入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。 开源地址：https://gitee.com/kwwwvagaa/net_winform_custom_control 如果觉得写的还行，请点个 star 支持一下吧 欢迎前来交流探讨： 企鹅群568015492 目录 ......
前提
入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。
开源地址：
如果觉得写的还行，请点个 star 支持一下吧
欢迎前来交流探讨： 企鹅群568015492
目录
准备工作
终于到文本框了，文本框将包含原文本框扩展，透明文本框，数字输入文本框，带边框文本框
本文将讲解透明文本框
开始
这个用到的很少，直接看代码吧
1 // 版权所有 黄正辉 交流群：568015492 qq：623128629
2 // 文件名称：textboxtransparent.cs
3 // 创建日期：2019-08-15 16:03:49
4 // 功能描述：textbox
5 // 项目地址：https://gitee.com/kwwwvagaa/net_winform_custom_control
6 using system;
7 using system.collections;
8 using system.componentmodel;
9 using system.drawing;
10 using system.data;
11 using system.windows.forms;
12
13 using system.drawing.imaging;
14
15 namespace hzh_controls.controls
16 {
17 public class textboxtransparent : textboxex
18 {
19 #region private variables
20
21 private upicturebox mypicturebox;
22 private bool myuptodate = false;
23 private bool mycaretuptodate = false;
24 private bitmap mybitmap;
25 private bitmap myalphabitmap;
26
27 private int myfontheight = 10;
28
29 private system.windows.forms.timer mytimer1;
30
31 private bool mycaretstate = true;
32
33 private bool mypaintedfirsttime = false;
34
35 private color mybackcolor = color.white;
36 private int mybackalpha = 10;
37
38 /// <summary>
39 /// required designer variable.
40 /// </summary>
41 private system.componentmodel.container components = null;
42
43 #endregion // end private variables
44
45
46 #region public methods and overrides
47
48 public textboxtransparent()
49 {
50 // this call is required by the windows.forms form designer.
51 initializecomponent();
52 // todo: add any initialization after the initializecomponent call
53
54 this.backcolor = mybackcolor;
55
56 this.setstyle(controlstyles.userpaint, false);
57 this.setstyle(controlstyles.allpaintinginwmpaint, true);
58 this.setstyle(controlstyles.doublebuffer, true);
59
60
61 mypicturebox = new upicturebox();
62 this.controls.add(mypicturebox);
63 mypicturebox.dock = dockstyle.fill;
64 }
65
66
67 protected override void onresize(eventargs e)
68 {
69
70 base.onresize(e);
71 this.mybitmap = new bitmap(this.clientrectangle.width, this.clientrectangle.height);//(this.width,this.height);
72 this.myalphabitmap = new bitmap(this.clientrectangle.width, this.clientrectangle.height);//(this.width,this.height);
73 myuptodate = false;
74 this.invalidate();
75 }
76
77
78 //some of these should be moved to the wndproc later
79
80 protected override void onkeydown(keyeventargs e)
81 {
82 base.onkeydown(e);
83 myuptodate = false;
84 this.invalidate();
85 }
86
87 protected override void onkeyup(keyeventargs e)
88 {
89 base.onkeyup(e);
90 myuptodate = false;
91 this.invalidate();
92
93 }
94
95 protected override void onkeypress(keypresseventargs e)
96 {
97 base.onkeypress(e);
98 myuptodate = false;
99 this.invalidate();
100 }
101
102 protected override void onmouseup(mouseeventargs e)
103 {
104 base.onmouseup(e);
105 this.invalidate();
106 }
107
108 protected override void ongivefeedback(givefeedbackeventargs gfbevent)
109 {
110 base.ongivefeedback(gfbevent);
111 myuptodate = false;
112 this.invalidate();
113 }
114
115
116 protected override void onmouseleave(eventargs e)
117 {
118 //found this code to find the current cursor location
119 //at http://www.syncfusion.com/faq/winforms/faq_c50c.asp#q597q
120
121 point ptcursor = cursor.position;
122
123 form f = this.findform();
124 ptcursor = f.pointtoclient(ptcursor);
125 if (!this.bounds.contains(ptcursor))
126 base.onmouseleave(e);
127 }
128
129
130 protected override void onchangeuicues(uicueseventargs e)
131 {
132 base.onchangeuicues(e);
133 myuptodate = false;
134 this.invalidate();
135 }
136
137
138 //--
139 protected override void ongotfocus(eventargs e)
140 {
141 base.ongotfocus(e);
142 mycaretuptodate = false;
143 myuptodate = false;
144 this.invalidate();
145
146
147 mytimer1 = new system.windows.forms.timer(this.components);
148 mytimer1.interval = (int)win32.getcaretblinktime(); // usually around 500;
149
150 mytimer1.tick += new eventhandler(mytimer1_tick);
151 mytimer1.enabled = true;
152
153 }
154
155 protected override void onlostfocus(eventargs e)
156 {
157 base.onlostfocus(e);
158 mycaretuptodate = false;
159 myuptodate = false;
160 this.invalidate();
161
162 mytimer1.dispose();
163 }
164
165 //--
166
167 protected override void onfontchanged(eventargs e)
168 {
169 if (this.mypaintedfirsttime)
170 this.setstyle(controlstyles.userpaint, false);
171
172 base.onfontchanged(e);
173
174 if (this.mypaintedfirsttime)
175 this.setstyle(controlstyles.userpaint, true);
176
177
178 myfontheight = getfontheight();
179
180
181 myuptodate = false;
182 this.invalidate();
183 }
184
185 protected override void ontextchanged(eventargs e)
186 {
187 base.ontextchanged(e);
188 myuptodate = false;
189 this.invalidate();
190 }
191
192
193 protected override void wndproc(ref message m)
194 {
195
196 base.wndproc(ref m);
197
198 // need to rewrite as a big switch
199
200 if (m.msg == win32.wm_paint)
201 {
202
203 mypaintedfirsttime = true;
204
205 if (!myuptodate || !mycaretuptodate)
206 getbitmaps();
207 myuptodate = true;
208 mycaretuptodate = true;
209
210 if (mypicturebox.image != null) mypicturebox.image.dispose();
211
212
213 if (string.isnullorempty(this.text) && !string.isnullorempty(this.prompttext))
214 {
215 bitmap bit = (bitmap)myalphabitmap.clone();
216 graphics g = graphics.fromimage(bit);
217 sizef sizet1 = g.measurestring(this.prompttext, this.promptfont);
218 g.drawstring(this.prompttext, this.promptfont, new solidbrush(promptcolor), new pointf(3, (bit.height - sizet1.height) / 2));
219 g.dispose();
220 mypicturebox.image = bit;
221 }
222 else
223 {
224 mypicturebox.image = (image)myalphabitmap.clone();
225 }
226 }
227
228 else if (m.msg == win32.wm_hscroll || m.msg == win32.wm_vscroll)
229 {
230 myuptodate = false;
231 this.invalidate();
232 }
233
234 else if (m.msg == win32.wm_lbuttondown
235 || m.msg == win32.wm_rbuttondown
236 || m.msg == win32.wm_lbuttondblclk
237 // || m.msg == win32.wm_mouseleave ///****
238 )
239 {
240 myuptodate = false;
241 this.invalidate();
242 }
243
244 else if (m.msg == win32.wm_mousemove)
245 {
246 if (m.wparam.toint32() != 0) //shift key or other buttons
247 {
248 myuptodate = false;
249 this.invalidate();
250 }
251 }
252
253 if (m.msg == 15 || m.msg == 7 || m.msg == 8)
254 {
255 base.onpaint(null);
256 }
257
258 //system.diagnostics.debug.writeline("pro: " + m.msg.tostring("x"));
259
260 }
261
262
263 /// <summary>
264 /// clean up any resources being used.
265 /// </summary>
266 protected override void dispose(bool disposing)
267 {
268 if (disposing)
269 {
270 //this.backcolor = color.pink;
271 if (components != null)
272 {
273 components.dispose();
274 }
275 }
276 base.dispose(disposing);
277 }
278
279 #endregion //end public method and overrides
280
281
282 #region public property overrides
283
284 public new borderstyle borderstyle
285 {
286 get { return base.borderstyle; }
287 set
288 {
289 if (this.mypaintedfirsttime)
290 this.setstyle(controlstyles.userpaint, false);
291
292 base.borderstyle = value;
293
294 if (this.mypaintedfirsttime)
295 this.setstyle(controlstyles.userpaint, true);
296
297 this.mybitmap = null;
298 this.myalphabitmap = null;
299 myuptodate = false;
300 this.invalidate();
301 }
302 }
303
304 public new color backcolor
305 {
306 get
307 {
308 return color.fromargb(base.backcolor.r, base.backcolor.g, base.backcolor.b);
309 }
310 set
311 {
312 mybackcolor = value;
313 base.backcolor = value;
314 myuptodate = false;
315 }
316 }
317 public override bool multiline
318 {
319 get { return base.multiline; }
320 set
321 {
322 if (this.mypaintedfirsttime)
323 this.setstyle(controlstyles.userpaint, false);
324
325 base.multiline = value;
326
327 if (this.mypaintedfirsttime)
328 this.setstyle(controlstyles.userpaint, true);
329
330 this.mybitmap = null;
331 this.myalphabitmap = null;
332 myuptodate = false;
333 this.invalidate();
334 }
335 }
336
337
338 #endregion //end public property overrides
339
340
341 #region private functions and classes
342
343 private int getfontheight()
344 {
345 graphics g = this.creategraphics();
346 sizef sf_font = g.measurestring("x", this.font);
347 g.dispose();
348 return (int)sf_font.height;
349 }
350
351
352 private void getbitmaps()
353 {
354
355 if (mybitmap == null
356 || myalphabitmap == null
357 || mybitmap.width != width
358 || mybitmap.height != height
359 || myalphabitmap.width != width
360 || myalphabitmap.height != height)
361 {
362 mybitmap = null;
363 myalphabitmap = null;
364 }
365
366
367
368 if (mybitmap == null)
369 {
370 mybitmap = new bitmap(this.clientrectangle.width, this.clientrectangle.height);//(width,height);
371 myuptodate = false;
372 }
373
374
375 if (!myuptodate)
376 {
377 //capture the textbox control window
378
379 this.setstyle(controlstyles.userpaint, false);
380
381 win32.capturewindow(this, ref mybitmap);
382
383 this.setstyle(controlstyles.userpaint, true);
384 this.setstyle(controlstyles.supportstransparentbackcolor, true);
385 this.backcolor = color.fromargb(mybackalpha, mybackcolor);
386
387 }
388 //--
389
390
391
392 rectangle r2 = new rectangle(0, 0, this.clientrectangle.width, this.clientrectangle.height);
393 imageattributes tempimageattr = new imageattributes();
394
395
396 //found the color map code in the ms help
397
398 colormap[] tempcolormap = new colormap[1];
399 tempcolormap[0] = new colormap();
400 tempcolormap[0].oldcolor = color.fromargb(255, mybackcolor);
401 tempcolormap[0].newcolor = color.fromargb(mybackalpha, mybackcolor);
402
403 tempimageattr.setremaptable(tempcolormap);
404
405 if (myalphabitmap != null)
406 myalphabitmap.dispose();
407
408
409 myalphabitmap = new bitmap(this.clientrectangle.width, this.clientrectangle.height);//(width,height);
410
411 graphics tempgraphics1 = graphics.fromimage(myalphabitmap);
412
413 tempgraphics1.drawimage(mybitmap, r2, 0, 0, this.clientrectangle.width, this.clientrectangle.height, graphicsunit.pixel, tempimageattr);
414
415 tempgraphics1.dispose();
416
417 //----
418
419 if (this.focused && (this.selectionlength == 0))
420 {
421 graphics tempgraphics2 = graphics.fromimage(myalphabitmap);
422 if (mycaretstate)
423 {
424 //draw the caret
425 point caret = this.findcaret();
426 pen p = new pen(this.forecolor, 3);
427 tempgraphics2.drawline(p, caret.x + 2, caret.y + 0, caret.x + 2, caret.y + myfontheight);
428 tempgraphics2.dispose();
429 }
430
431 }
432
433
434
435 }
436
437
438
439 private point findcaret()
440 {
441 /* find the caret translated from code at
442 * http://www.vb-helper.com/howto_track_textbox_caret.html
443 *
444 * and
445 *
446 * http://www.microbion.co.uk/developers/csharp/textpos2.htm
447 *
448 * changed to em_posfromchar
449 *
450 * this code still needs to be cleaned up and debugged
451 * */
452
453 point pointcaret = new point(0);
454 int i_char_loc = this.selectionstart;
455 intptr pi_char_loc = new intptr(i_char_loc);
456
457 int i_point = win32.sendmessage(this.handle, win32.em_posfromchar, pi_char_loc, intptr.zero);
458 pointcaret = new point(i_point);
459
460 if (i_char_loc == 0)
461 {
462 pointcaret = new point(0);
463 }
464 else if (i_char_loc >= this.text.length)
465 {
466 pi_char_loc = new intptr(i_char_loc - 1);
467 i_point = win32.sendmessage(this.handle, win32.em_posfromchar, pi_char_loc, intptr.zero);
468 pointcaret = new point(i_point);
469
470 graphics g = this.creategraphics();
471 string t1 = this.text.substring(this.text.length - 1, 1) + "x";
472 sizef sizet1 = g.measurestring(t1, this.font);
473 sizef sizex = g.measurestring("x", this.font);
474 g.dispose();
475 int xoffset = (int)(sizet1.width - sizex.width);
476 pointcaret.x = pointcaret.x + xoffset;
477
478 if (i_char_loc == this.text.length)
479 {
480 string slast = this.text.substring(text.length - 1, 1);
481 if (slast == "\n")
482 {
483 pointcaret.x = 1;
484 pointcaret.y = pointcaret.y + myfontheight;
485 }
486 }
487
488 }
489
490
491
492 return pointcaret;
493 }
494
495
496 private void mytimer1_tick(object sender, eventargs e)
497 {
498 //timer used to turn caret on and off for focused control
499
500 mycaretstate = !mycaretstate;
501 mycaretuptodate = false;
502 this.invalidate();
503 }
504
505
506 private class upicturebox : picturebox
507 {
508 public upicturebox()
509 {
510 this.setstyle(controlstyles.selectable, false);
511 this.setstyle(controlstyles.userpaint, true);
512 this.setstyle(controlstyles.allpaintinginwmpaint, true);
513 this.setstyle(controlstyles.doublebuffer, true);
514
515 this.cursor = null;
516 this.enabled = true;
517 this.sizemode = pictureboxsizemode.normal;
518
519 }
520
521
522
523
524 //upicturebox
525 protected override void wndproc(ref message m)
526 {
527 if (m.msg == win32.wm_lbuttondown
528 || m.msg == win32.wm_rbuttondown
529 || m.msg == win32.wm_lbuttondblclk
530 || m.msg == win32.wm_mouseleave
531 || m.msg == win32.wm_mousemove)
532 {
533 //send the above messages back to the parent control
534 win32.postmessage(this.parent.handle, (uint)m.msg, m.wparam, m.lparam);
535 }
536
537 else if (m.msg == win32.wm_lbuttonup)
538 {
539 //?? for selects and such
540 this.parent.invalidate();
541 }
542
543
544 base.wndproc(ref m);
545 }
546
547
548 } // end upicturebox class
549
550
551 #endregion // end private functions and classes
552
553
554 #region component designer generated code
555 /// <summary>
556 /// required method for designer support - do not modify
557 /// the contents of this method with the code editor.
558 /// </summary>
559 private void initializecomponent()
560 {
561 components = new system.componentmodel.container();
562 }
563 #endregion
564
565
566 #region new public properties
567
568 [
569 category("appearance"),
570 description("the alpha value used to blend the control's background. valid values are 0 through 255."),
571 browsable(true),
572 designerserializationvisibility(designerserializationvisibility.visible)
573
574 ]
575 public int backalpha
576 {
577 get { return mybackalpha; }
578 set
579 {
580 int v = value;
581 if (v > 255)
582 v = 255;
583 mybackalpha = v;
584 myuptodate = false;
585 invalidate();
586 }
587 }
588
589 #endregion
590
591
592
593 } // end alphatextbox class
594 }
用处及效果
用到的比较少，你高兴就用，哈哈
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