Si estás trabajando con Visual Studio 2003 .NET es decir con
el framework 1.1 puedes que tenga la siguiente problemática dentro de los
controles de tipo “Panel”, ya que dicho panel tienes la opción de “AutoScroll”
que esta opción habilitaría el scroll dentro de vuestro panel pero claro podría
darse el caso que solo queremos que el scroll aparezca en horizontal o el vertical solamente.
Esto por defecto no está implementado en el framework 1.1 de Microsoft pero buscando
por internet encontrado una solución para poder realizar esta tarea.
Vamos a trabaja con el siguiente ejemplo:
Resultado:
Como vemos tenemos la propiedad de “AutoScroll” activado y
aparece los dos scroll tanto el vertical como el horizontal. Este ejemplo vamos
es modificar nuestra aplicación para solo mostrar el Scroll vertical.
Paso 1: Añadir nueva clase a nuestro proyecto.
ScrollablePanel.cs
Esta clase se base el componente “
System.Windows.Forms.Panel” pero añadiendo
nuevas funcionalidades y propiedades.1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 | using System;namespace CustomAutoScrollPanel{ using System; using System.Windows.Forms; using System.Runtime.InteropServices ; /// <summary> /// Description résumée de ScrollablePanel. /// </summary> public class ScrollablePanel: System.Windows.Forms.Panel { #region Delegates & events public event System.Windows.Forms.ScrollEventHandler ScrollHorizontal; public event System.Windows.Forms.ScrollEventHandler ScrollVertical; public event System.Windows.Forms.MouseEventHandler ScrollMouseWheel; #endregion #region Const private const int SB_LINEUP = 0; private const int SB_LINEDOWN = 1; private const int SB_PAGEUP = 2; private const int SB_PAGEDOWN = 3; private const int SB_THUMBPOSITION = 4; private const int SB_THUMBTRACK = 5; private const int SB_TOP = 6; private const int SB_BOTTOM = 7; private const int SB_ENDSCROLL = 8; private const int WM_HSCROLL = 0x114; private const int WM_VSCROLL = 0x115; private const int WM_MOUSEWHEEL = 0x020A; private const int WM_NCCALCSIZE =0x0083; private const int WM_PAINT =0x000F; private const int WM_SIZE =0x0005; private const uint SB_HORZ = 0; private const uint SB_VERT = 1; private const uint SB_CTL = 2; private const uint SB_BOTH = 3; private const uint ESB_DISABLE_BOTH = 0x3; private const uint ESB_ENABLE_BOTH = 0x0; private const int MK_LBUTTON = 0x01; private const int MK_RBUTTON = 0x02; private const int MK_SHIFT = 0x04; private const int MK_CONTROL = 0x08; private const int MK_MBUTTON = 0x10; private const int MK_XBUTTON1 = 0x0020; private const int MK_XBUTTON2 = 0x0040; #endregion #region Vars private bool enableAutoHorizontal = true; private bool enableAutoVertical = true; private bool visibleAutoHorizontal = true; private bool visibleAutoVertical = true; private int autoScrollHorizontalMinimum = 0; private int autoScrollHorizontalMaximum = 100; private int autoScrollVerticalMinimum = 0; private int autoScrollVerticalMaximum = 100; #endregion #region Constructor public ScrollablePanel() { this.Click += new EventHandler(ScrollablePanel_Click); this.AutoScroll = true; } #endregion #region Properties public int AutoScrollHPos { get { return GetScrollPos(this.Handle, (int)SB_HORZ); } set { SetScrollPos(this.Handle, (int)SB_HORZ, value, true); } } public int AutoScrollVPos { get { return GetScrollPos(this.Handle, (int)SB_VERT); } set { SetScrollPos(this.Handle, (int)SB_VERT, value, true); } } public int AutoScrollHorizontalMinimum { get { return this.autoScrollHorizontalMinimum; } set { this.autoScrollHorizontalMinimum = value; SetScrollRange(this.Handle, (int)SB_HORZ, autoScrollHorizontalMinimum, autoScrollHorizontalMaximum, true); } } public int AutoScrollHorizontalMaximum { get { return this.autoScrollHorizontalMaximum; } set { this.autoScrollHorizontalMaximum = value; SetScrollRange(this.Handle, (int)SB_HORZ, autoScrollHorizontalMinimum, autoScrollHorizontalMaximum, true); } } public int AutoScrollVerticalMinimum { get { return this.autoScrollVerticalMinimum; } set { this.autoScrollVerticalMinimum = value; SetScrollRange(this.Handle, (int)SB_VERT, autoScrollHorizontalMinimum, autoScrollHorizontalMaximum, true); } } public int AutoScrollVerticalMaximum { get { return this.autoScrollVerticalMaximum; } set { this.autoScrollVerticalMaximum = value; SetScrollRange(this.Handle, (int)SB_VERT, autoScrollHorizontalMinimum, autoScrollHorizontalMaximum, true); } } public bool EnableAutoScrollHorizontal { get { return this.enableAutoHorizontal; } set { this.enableAutoHorizontal = value; if (value) EnableScrollBar(this.Handle, SB_HORZ, ESB_ENABLE_BOTH); else EnableScrollBar(this.Handle, SB_HORZ, ESB_DISABLE_BOTH); } } public bool EnableAutoScrollVertical { get { return this.enableAutoVertical; } set { this.enableAutoVertical = value; if (value) EnableScrollBar(this.Handle, SB_VERT, ESB_ENABLE_BOTH); else EnableScrollBar(this.Handle, SB_VERT, ESB_DISABLE_BOTH); } } public bool VisibleAutoScrollHorizontal { get { return this.visibleAutoHorizontal; } set { this.visibleAutoHorizontal = value; ShowScrollBar(this.Handle, (int)SB_HORZ, value); } } public bool VisibleAutoScrollVertical { get { return this.visibleAutoVertical; } set { this.visibleAutoVertical = value; ShowScrollBar(this.Handle, (int)SB_VERT, value); } } #endregion #region ScrollEventType to SB_* messages and SB_* messages to ScrollEventType private int getSBFromScrollEventType(ScrollEventType type) { int res = -1; switch (type) { case ScrollEventType.SmallDecrement: res = SB_LINEUP; break; case ScrollEventType.SmallIncrement: res = SB_LINEDOWN; break; case ScrollEventType.LargeDecrement: res = SB_PAGEUP; break; case ScrollEventType.LargeIncrement: res = SB_PAGEDOWN; break; case ScrollEventType.ThumbTrack: res = SB_THUMBTRACK; break; case ScrollEventType.First: res = SB_TOP; break; case ScrollEventType.Last: res = SB_BOTTOM; break; case ScrollEventType.ThumbPosition: res = SB_THUMBPOSITION; break; case ScrollEventType.EndScroll: res = SB_ENDSCROLL; break; default: break; } return res; } private ScrollEventType getScrollEventType(System.IntPtr wParam) { ScrollEventType res = 0; switch (LoWord((int)wParam)) { case SB_LINEUP: res = ScrollEventType.SmallDecrement; break; case SB_LINEDOWN: res = ScrollEventType.SmallIncrement; break; case SB_PAGEUP: res = ScrollEventType.LargeDecrement; break; case SB_PAGEDOWN: res = ScrollEventType.LargeIncrement; break; case SB_THUMBTRACK: res = ScrollEventType.ThumbTrack; break; case SB_TOP: res = ScrollEventType.First; break; case SB_BOTTOM: res = ScrollEventType.Last; break; case SB_THUMBPOSITION: res = ScrollEventType.ThumbPosition; break; case SB_ENDSCROLL: res = ScrollEventType.EndScroll; break; default: res = ScrollEventType.EndScroll; break; } return res; } #endregion #region WndProd override protected override void WndProc(ref Message msg) { base.WndProc(ref msg); if (msg.HWnd != this.Handle) return; switch (msg.Msg) { case WM_MOUSEWHEEL: if (!this.VisibleAutoScrollVertical) return; try { int zDelta = HiWord((int)msg.WParam); int y = HiWord((int)msg.LParam); int x = LoWord((int)msg.LParam); System.Windows.Forms.MouseButtons butt; switch (LoWord((int)msg.WParam)) { case MK_LBUTTON: butt = System.Windows.Forms.MouseButtons.Left; break; case MK_MBUTTON: butt = System.Windows.Forms.MouseButtons.Middle; break; case MK_RBUTTON: butt = System.Windows.Forms.MouseButtons.Right; break; case MK_XBUTTON1: butt = System.Windows.Forms.MouseButtons.XButton1; break; case MK_XBUTTON2: butt = System.Windows.Forms.MouseButtons.XButton2; break; default: butt = System.Windows.Forms.MouseButtons.None; break; } System.Windows.Forms.MouseEventArgs arg0 = new System.Windows.Forms.MouseEventArgs(butt, 1, x, y, zDelta); this.ScrollMouseWheel(this, arg0); } catch (Exception) { } break; case WM_VSCROLL: try { ScrollEventType type = getScrollEventType(msg.WParam); ScrollEventArgs arg = new ScrollEventArgs(type, GetScrollPos(this.Handle, (int)SB_VERT)); this.ScrollVertical(this, arg); } catch (Exception) { } break; case WM_HSCROLL: try { ScrollEventType type = getScrollEventType(msg.WParam); ScrollEventArgs arg = new ScrollEventArgs(type, GetScrollPos(this.Handle, (int)SB_HORZ)); this.ScrollHorizontal(this, arg); } catch (Exception) { } break; default: break; } } #endregion #region Perform Manuel scrolling public void performScrollHorizontal(ScrollEventType type) { int param = getSBFromScrollEventType(type); if (param == -1) return; SendMessage(this.Handle, (uint)WM_HSCROLL, (System.UIntPtr)param, (System.IntPtr)0); } public void performScrollVertical(ScrollEventType type) { int param = getSBFromScrollEventType(type); if (param == -1) return; SendMessage(this.Handle, (uint)WM_VSCROLL, (System.UIntPtr)param, (System.IntPtr)0); } #endregion #region Panel Got focus private void ScrollablePanel_Click(object sender, EventArgs e) { this.Focus(); } #endregion #region API32 functions [DllImport("user32.dll", CharSet=CharSet.Auto)] static public extern int GetSystemMetrics(int code); [DllImport("user32.dll")] static public extern bool EnableScrollBar(System.IntPtr hWnd, uint wSBflags, uint wArrows); //[DllImport("user32.dll")] //static public extern bool GetScrollInfo(System.IntPtr hwnd, int fnBar, LPSCROLLINFO lpsi); [DllImport("user32.dll")] static public extern int SetScrollRange(System.IntPtr hWnd, int nBar, int nMinPos, int nMaxPos, bool bRedraw); [DllImport("user32.dll")] static public extern int SetScrollPos(System.IntPtr hWnd, int nBar, int nPos, bool bRedraw); [DllImport("user32.dll")] static public extern int GetScrollPos(System.IntPtr hWnd, int nBar); /* public struct LPSCROLLINFO { uint cbSize; uint fMask; int nMin; int nMax; uint nPage; int nPos; int nTrackPos; } */ [DllImport("user32.dll")] static public extern bool ShowScrollBar(System.IntPtr hWnd, int wBar, bool bShow); [DllImport("user32.dll")] static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, UIntPtr wParam, IntPtr lParam); [DllImport("user32.dll")] static extern int HIWORD(System.IntPtr wParam); static int MakeLong(int LoWord, int HiWord) { return (HiWord << 16) | (LoWord & 0xffff); } static IntPtr MakeLParam(int LoWord, int HiWord) { return (IntPtr) ((HiWord << 16) | (LoWord & 0xffff)); } static int HiWord(int number) { if ((number & 0x80000000) == 0x80000000) return (number >> 16); else return (number >> 16) & 0xffff ; } static int LoWord(int number) { return number & 0xffff; } #endregion }} |
Paso 2: Modificar nuestro panel.
- Modificamos el tipo de nuestro panel por el nuevo tipo
1 2 3 | // Cambio su tipo//private System.Windows.Forms.Panel panel1;private CustomAutoScrollPanel.ScrollablePanel panel1; |
- Modificamos al InitializeComponent que donde se inicializa el objeto, ya que ahora es de otro tipo.
1 2 3 | private void InitializeComponent(){ this.panel1 = new CustomAutoScrollPanel.ScrollablePanel(); |
- Modificar el constructor de nuestro formulario.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | public Form1(){ // // Necesario para admitir el Diseñador de Windows Forms // InitializeComponent(); // // TODO: agregar código de constructor después de llamar a InitializeComponent // this.panel1.AutoScroll = true; this.panel1.EnableAutoScrollHorizontal = false; this.panel1.VisibleAutoScrollHorizontal = false; this.panel1.EnableAutoScrollVertical = true; this.panel1.VisibleAutoScrollVertical = true;} |
Fuente: URL
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