1 using System; 2 using System.Collections.Generic; 3 using System.Windows.Forms; 4 using System.ComponentModel; 5 using System.Drawing; 6 using System.Drawing.Drawing2D; 7 using System.Runtime.InteropServices; 8 using System.Diagnostics; 9 10 namespace CaptionBox { 11 public class ThemeForm : Form { 12 #region private structs 13 14 struct _NonClientSizeInfo { 15 public Size CaptionButtonSize; 16 public Size BorderSize; 17 public int CaptionHeight; 18 public Rectangle CaptionRect; 19 public Rectangle Rect; 20 public Rectangle ClientRect; 21 public int Width; 22 public int Height; 23 }; 24 25 #endregion 26 27 #region constants 28 29 const int WM_NCACTIVATE = 0x86; 30 const int WM_NCPAINT = 0x85; 31 const int WM_NCLBUTTONDOWN = 0xA1; 32 const int WM_NCRBUTTONDOWN = 0x00A4; 33 const int WM_NCRBUTTONUP = 0x00A5; 34 const int WM_NCMOUSEMOVE = 0x00A0; 35 const int WM_NCLBUTTONUP = 0x00A2; 36 const int WM_NCCALCSIZE = 0x0083; 37 const int WM_NCMOUSEHOVER = 0x02A0; 38 const int WM_NCMOUSELEAVE = 0x02A2; 39 const int WM_NCHITTEST = 0x0084; 40 const int WM_NCCREATE = 0x0081; 41 //const int WM_RBUTTONUP = 0x0205; 42 43 const int WM_LBUTTONDOWN = 0x0201; 44 const int WM_CAPTURECHANGED = 0x0215; 45 const int WM_LBUTTONUP = 0x0202; 46 const int WM_SETCURSOR = 0x0020; 47 const int WM_CLOSE = 0x0010; 48 const int WM_SYSCOMMAND = 0x0112; 49 const int WM_MOUSEMOVE = 0x0200; 50 const int WM_SIZE = 0x0005; 51 const int WM_SIZING = 0x0214; 52 const int WM_GETMINMAXINFO = 0x0024; 53 const int WM_ENTERSIZEMOVE = 0x0231; 54 const int WM_WINDOWPOSCHANGING = 0x0046; 55 56 // FOR WM_SIZING MSG WPARAM 57 const int WMSZ_BOTTOM = 6; 58 const int WMSZ_BOTTOMLEFT = 7; 59 const int WMSZ_BOTTOMRIGHT = 8; 60 const int WMSZ_LEFT = 1; 61 const int WMSZ_RIGHT = 2; 62 const int WMSZ_TOP = 3; 63 const int WMSZ_TOPLEFT = 4; 64 const int WMSZ_TOPRIGHT = 5; 65 66 // left mouse button is down. 67 const int MK_LBUTTON = 0x0001; 68 69 const int SC_CLOSE = 0xF060; 70 const int SC_MAXIMIZE = 0xF030; 71 const int SC_MINIMIZE = 0xF020; 72 const int SC_RESTORE = 0xF120; 73 const int SC_CONTEXTHELP = 0xF180; 74 75 const int HTCAPTION = 2; 76 const int HTCLOSE = 20; 77 const int HTHELP = 21; 78 const int HTMAXBUTTON = 9; 79 const int HTMINBUTTON = 8; 80 const int HTTOP = 12; 81 82 const int SM_CYBORDER = 6; 83 const int SM_CXBORDER = 5; 84 const int SM_CYCAPTION = 4; 85 86 const int CS_DropSHADOW = 0x20000; 87 const int GCL_STYLE = (-26); 88 89 #endregion 90 91 #region windows api 92 93 [DllImport("User32.dll")] 94 private static extern IntPtr GetWindowDC(IntPtr hwnd); 95 [DllImport("User32.dll")] 96 [return: MarshalAs(UnmanagedType.Bool)] 97 private static extern bool GetWindowRect(IntPtr hwnd, ref _RECT rect); 98 [DllImport("User32.dll")] 99 private static extern int ReleaseDC(IntPtr hwnd, IntPtr hdc); 100 101 [DllImport("user32.dll", CharSet = CharSet.Auto)] 102 public static extern int SetClassLong(IntPtr hwnd, int nIndex, int dwNewLong); 103 [DllImport("user32.dll", CharSet = CharSet.Auto)] 104 public static extern int GetClassLong(IntPtr hwnd, int nIndex); 105 106 #endregion 107 108 #region default constructor 109 110 public ThemeForm() { 111 Text = "ThemeForm1"; 112 CloseButtonImage = Properties.Resources.close.ToBitmap(); 113 CloseButtonHoverImage = Properties.Resources.close2.ToBitmap(); 114 CloseButtonPressDownImage = Properties.Resources.close2.ToBitmap(); 115 116 MaximumButtonImage = Properties.Resources.max.ToBitmap(); 117 MaximumButtonHoverImage = Properties.Resources.max2.ToBitmap(); 118 MaximumButtonPressDownImage = Properties.Resources.max2.ToBitmap(); 119 120 MaximumNormalButtonImage = Properties.Resources.maxnorm.ToBitmap(); 121 MaximumNormalButtonHoverImage = Properties.Resources.maxnorm2.ToBitmap(); 122 MaximumNormalButtonPressDownImage = Properties.Resources.maxnorm2.ToBitmap(); 123 124 MinimumButtonImage = Properties.Resources.min.ToBitmap(); 125 MinimumButtonHoverImage = Properties.Resources.min2.ToBitmap(); 126 MinimumButtonPressDownImage = Properties.Resources.min2.ToBitmap(); 127 128 HelpButtonImage = Properties.Resources.help.ToBitmap(); 129 HelpButtonHoverImage = Properties.Resources.help2.ToBitmap(); 130 HelpButtonPressDownImage = Properties.Resources.help2.ToBitmap(); 131 CaptionColor = Brushes.White; 132 CaptionBackgroundColor = Color.DimGray; 133 134 SetClassLong(this.Handle, GCL_STYLE, GetClassLong(this.Handle, GCL_STYLE) | CS_DropSHADOW); //API函数加载，实现窗体边框阴影效果 135 } 136 137 #endregion 138 139 [DefaultValue("")] 140 [Browsable(true)] 141 [Category("ControlBox")] 142 public virtual ContextMenuStrip CaptionContextMenu { get; set; } 143 144 protected virtual void OnCaptionContextMenu(int x, int y) { 145 if (this.CaptionContextMenu != null) 146 this.CaptionContextMenu.Show(x, y); 147 } 148 149 #region properties 150 151 [Category("ControlBox")] 152 [Description("Close button image in control box.")] 153 [DisplayName("CloseButtonImage")] 154 [DesignOnly(true)] 155 public Image CloseButtonImage { get; set; } 156 157 [Category("ControlBox")] 158 [Description("Close button image pressed down in control box.")] 159 [DisplayName("CloseButtonPressDownImage")] 160 [DesignOnly(true)] 161 public Image CloseButtonPressDownImage { get; set; } 162 163 [Category("ControlBox")] 164 [Description("Close button image hover in control box.")] 165 [DisplayName("CloseButtonHoverImage")] 166 [DesignOnly(true)] 167 public Image CloseButtonHoverImage { get; set; } 168 169 [Category("ControlBox")] 170 [Description("Maximum button image in control box.")] 171 [DisplayName("MaximumButtonImage")] 172 [DesignOnly(true)] 173 public Image MaximumButtonImage { get; set; } 174 175 [Category("ControlBox")] 176 [Description("Maximum button hover image in control box.")] 177 [DisplayName("MaximumButtonHoverImage")] 178 [DesignOnly(true)] 179 public Image MaximumButtonHoverImage { get; set; } 180 181 [Category("ControlBox")] 182 [Description("Maximum button pressed down image in control box.")] 183 [DisplayName("MaximumButtonPressDownImage")] 184 [DesignOnly(true)] 185 public Image MaximumButtonPressDownImage { get; set; } 186 187 [Category("ControlBox")] 188 [Description("Maximum Normal button image in control box.")] 189 [DisplayName("MaximumNormalButtonImage")] 190 [DesignOnly(true)] 191 public Image MaximumNormalButtonImage { get; set; } 192 193 [Category("ControlBox")] 194 [Description("Maximum Normal button hover image in control box.")] 195 [DisplayName("MaximumNormalButtonHoverImage")] 196 [DesignOnly(true)] 197 public Image MaximumNormalButtonHoverImage { get; set; } 198 199 [Category("ControlBox")] 200 [Description("Maximum Normal button pressed down image in control box.")] 201 [DisplayName("MaximumNormalButtonPressDownImage")] 202 [DesignOnly(true)] 203 public Image MaximumNormalButtonPressDownImage { get; set; } 204 205 [Category("ControlBox")] 206 [Description("Minimum button image in control box.")] 207 [DisplayName("MinimumButtonImage")] 208 [DesignOnly(true)] 209 public Image MinimumButtonImage { get; set; } 210 211 [Category("ControlBox")] 212 [Description("Minimum button hover image in control box.")] 213 [DisplayName("MinimumButtonHoverImage")] 214 [DesignOnly(true)] 215 public Image MinimumButtonHoverImage { get; set; } 216 217 [Category("ControlBox")] 218 [Description("Minimum button pressed down image in control box.")] 219 [DisplayName("MinimumButtonPressDownImage")] 220 [DesignOnly(true)] 221 public Image MinimumButtonPressDownImage { get; set; } 222 223 [Category("ControlBox")] 224 [Description("Help button image in control box.")] 225 [DisplayName("HelpButtonImage")] 226 [DesignOnly(true)] 227 public Image HelpButtonImage { get; set; } 228 229 [Category("ControlBox")] 230 [Description("Help button hover image in control box.")] 231 [DisplayName("HelpButtonHoverImage")] 232 [DesignOnly(true)] 233 public Image HelpButtonHoverImage { get; set; } 234 235 [Category("ControlBox")] 236 [Description("Help button pressed down image in control box.")] 237 [DisplayName("HelpButtonPressDownImage")] 238 [DesignOnly(true)] 239 public Image HelpButtonPressDownImage { get; set; } 240 241 [Category("CaptionColor")] 242 [Description("The color of caption.")] 243 [DisplayName("CaptionColor")] 244 [DesignOnly(true)] 245 public Brush CaptionColor { get; set; } 246 247 [Category("CaptionColor")] 248 [Description("The color of caption.")] 249 [DisplayName("CaptionBackgroundColor")] 250 [DefaultValue(typeof(Color), "Black")] 251 [DesignOnly(true)] 252 public Color CaptionBackgroundColor { get; set; } 253 254 #endregion 255 256 #region help methods 257 258 private _NonClientSizeInfo GetNonClientInfo(IntPtr hwnd) { 259 _NonClientSizeInfo info = new _NonClientSizeInfo(); 260 info.CaptionButtonSize = SystemInformation.CaptionButtonSize; 261 info.CaptionHeight = SystemInformation.CaptionHeight; 262 263 switch (this.FormBorderStyle) { 264 case System.Windows.Forms.FormBorderStyle.Fixed3D: 265 info.BorderSize = SystemInformation.FixedFrameBorderSize; 266 break; 267 case System.Windows.Forms.FormBorderStyle.FixedDialog: 268 info.BorderSize = SystemInformation.FixedFrameBorderSize; 269 break; 270 case System.Windows.Forms.FormBorderStyle.FixedSingle: 271 info.BorderSize = SystemInformation.FixedFrameBorderSize; 272 break; 273 case System.Windows.Forms.FormBorderStyle.FixedToolWindow: 274 info.BorderSize = SystemInformation.FixedFrameBorderSize; 275 info.CaptionButtonSize = SystemInformation.ToolWindowCaptionButtonSize; 276 info.CaptionHeight = SystemInformation.ToolWindowCaptionHeight; 277 break; 278 case System.Windows.Forms.FormBorderStyle.Sizable: 279 info.BorderSize = SystemInformation.FrameBorderSize; 280 break; 281 case System.Windows.Forms.FormBorderStyle.SizableToolWindow: 282 info.CaptionButtonSize = SystemInformation.ToolWindowCaptionButtonSize; 283 info.BorderSize = SystemInformation.FrameBorderSize; 284 info.CaptionHeight = SystemInformation.ToolWindowCaptionHeight; 285 break; 286 default: 287 info.BorderSize = SystemInformation.BorderSize; 288 break; 289 } 290 291 _RECT areatRect = new _RECT(); 292 GetWindowRect(hwnd, ref areatRect); 293 294 int width = areatRect.right - areatRect.left; 295 int height = areatRect.bottom - areatRect.top; 296 297 info.Width = width; 298 info.Height = height; 299 300 Point xy = new Point(areatRect.left, areatRect.top); 301 xy.Offset(-areatRect.left, -areatRect.top); 302 303 info.CaptionRect = new Rectangle(xy.X, xy.Y + info.BorderSize.Height, width, info.CaptionHeight); 304 info.Rect = new Rectangle(xy.X, xy.Y, width, height); 305 info.ClientRect = new Rectangle(xy.X + info.BorderSize.Width, 306 xy.Y + info.CaptionHeight + info.BorderSize.Height, 307 width - info.BorderSize.Width * 2, 308 height - info.CaptionHeight - info.BorderSize.Height * 2); 309 310 return info; 311 } 312 313 private void DrawTitle(Graphics g, _NonClientSizeInfo ncInfo, bool active) { 314 int titleX; 315 316 if (this.ShowIcon && 317 this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.FixedToolWindow && 318 this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.SizableToolWindow) { 319 Size iconSize = SystemInformation.SmallIconSize; 320 g.DrawIcon(this.Icon, new Rectangle(new Point(ncInfo.BorderSize.Width, ncInfo.BorderSize.Height + (ncInfo.CaptionHeight - iconSize.Height) / 2), iconSize)); 321 titleX = ncInfo.BorderSize.Width + iconSize.Width + ncInfo.BorderSize.Width; 322 } else { 323 titleX = ncInfo.BorderSize.Width; 324 } 325 326 SizeF captionTitleSize = g.MeasureString(this.Text, SystemFonts.CaptionFont); 327 g.DrawString(this.Text, SystemFonts.CaptionFont, CaptionColor, 328 new RectangleF(titleX, 329 (ncInfo.BorderSize.Height + ncInfo.CaptionHeight - captionTitleSize.Height) / 2, 330 ncInfo.CaptionRect.Width - ncInfo.BorderSize.Width * 2 - SystemInformation.MinimumWindowSize.Width, 331 ncInfo.CaptionRect.Height), StringFormat.GenericTypographic); 332 } 333 334 private void DrawBorder(Graphics g, _NonClientSizeInfo ncInfo, Brush background, bool active) { 335 Rectangle borderTop = new Rectangle(ncInfo.Rect.Left, 336 ncInfo.Rect.Top, 337 ncInfo.Rect.Left + ncInfo.Rect.Width, 338 ncInfo.Rect.Top + ncInfo.BorderSize.Height); 339 Rectangle borderLeft = new Rectangle( 340 new Point(ncInfo.Rect.Location.X, ncInfo.Rect.Location.Y + ncInfo.BorderSize.Height), 341 new Size(ncInfo.BorderSize.Width, ncInfo.ClientRect.Height + ncInfo.CaptionHeight + ncInfo.BorderSize.Height)); 342 Rectangle borderRight = new Rectangle(ncInfo.Rect.Left + ncInfo.Rect.Width - ncInfo.BorderSize.Width, 343 ncInfo.Rect.Top + ncInfo.BorderSize.Height, 344 ncInfo.BorderSize.Width, 345 ncInfo.ClientRect.Height + ncInfo.CaptionHeight + ncInfo.BorderSize.Height); 346 Rectangle borderBottom = new Rectangle(ncInfo.Rect.Left + ncInfo.BorderSize.Width, 347 ncInfo.Rect.Top + ncInfo.Rect.Height - ncInfo.BorderSize.Height, 348 ncInfo.Rect.Width - ncInfo.BorderSize.Width * 2, 349 ncInfo.Rect.Height); 350 351 //Rectangle leftbottom = new Rectangle(new Point(ncInfo.Rect.Location.X, ncInfo.Rect.Height - ncInfo.BorderSize.Width * 2), 352 // new Size(ncInfo.BorderSize.Width * 2, ncInfo.BorderSize.Width * 2)); 353 354 //g.FillPie(Brushes.Red, leftbottom, 90, 180); 355 //g.FillRectangle(Brushes.Red, leftbottom); 356 // top border 357 g.FillRectangle(background, borderTop); 358 // left border 359 g.FillRectangle(background, borderLeft); 360 // right border 361 g.FillRectangle(background, borderRight); 362 // bottom border 363 g.FillRectangle(background, borderBottom); 364 } 365 366 private void DrawCaption(IntPtr hwnd, bool active) { 367 IntPtr dc; 368 Graphics g; 369 Size iconSize; 370 _NonClientSizeInfo ncInfo; 371 Brush backgroundColor = new SolidBrush(CaptionBackgroundColor); 372 Brush foregroundColor = CaptionColor; 373 374 iconSize = SystemInformation.SmallIconSize; 375 376 dc = GetWindowDC(hwnd); 377 ncInfo = GetNonClientInfo(hwnd); 378 g = Graphics.FromHdc(dc); 379 380 g.FillRectangle(backgroundColor, ncInfo.CaptionRect); 381 382 DrawBorder(g, ncInfo, backgroundColor, active); 383 DrawTitle(g, ncInfo, active); 384 DrawControlBox(g, ncInfo, backgroundColor, this.ControlBox, this.MaximizeBox, this.MinimizeBox, this.HelpButton); 385 386 g.Dispose(); 387 ReleaseDC(hwnd, dc); 388 } 389 390 private void DrawControlBox(Graphics g, _NonClientSizeInfo info, Brush background, bool closeBtn, bool maxBtn, bool minBtn, bool helpBtn) { 391 if (this.ControlBox) { 392 int closeBtnPosX = info.CaptionRect.Left + info.CaptionRect.Width - info.BorderSize.Width - info.CaptionButtonSize.Width; 393 int maxBtnPosX = closeBtnPosX - info.CaptionButtonSize.Width; 394 int minBtnPosX = maxBtnPosX - info.CaptionButtonSize.Width; 395 int btnPosY = info.BorderSize.Height + (info.CaptionHeight - info.CaptionButtonSize.Height) / 2; 396 397 Rectangle btnRect = new Rectangle(new Point(closeBtnPosX, btnPosY), info.CaptionButtonSize); 398 Rectangle maxRect = new Rectangle(new Point(maxBtnPosX, btnPosY), info.CaptionButtonSize); 399 Rectangle minRect = new Rectangle(new Point(minBtnPosX, btnPosY), info.CaptionButtonSize); 400 401 Brush backgroundColor = new SolidBrush(CaptionBackgroundColor); 402 403 g.FillRectangle(backgroundColor, btnRect); 404 g.FillRectangle(backgroundColor, maxRect); 405 g.FillRectangle(backgroundColor, minRect); 406 407 g.DrawImage(CloseButtonImage, btnRect); 408 409 if (this.MaximizeBox || this.MinimizeBox) { 410 if (this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.FixedToolWindow && 411 this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.SizableToolWindow) { 412 if (this.WindowState == FormWindowState.Maximized) { 413 g.DrawImage(MaximumNormalButtonImage, maxRect); 414 } else { 415 g.DrawImage(MaximumButtonImage, maxRect); 416 } 417 g.DrawImage(MinimumButtonImage, minRect); 418 } 419 } else if (this.HelpButton) { 420 if (this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.FixedToolWindow && 421 this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.SizableToolWindow) { 422 g.DrawImage(HelpButtonImage, maxRect); 423 } 424 } 425 } 426 } 427 428 #endregion 429 430 #region Major method WndProc 431 432 private int LOBYTE(long p) { return (int)(p & 0x0000FFFF); } 433 private int HIBYTE(long p) { return (int)(p >> 16); } 434 435 protected override void WndProc(ref Message m) { 436 if (this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.None) { 437 switch (m.Msg) { 438 case WM_NCPAINT: 439 DrawCaption(m.HWnd, Form.ActiveForm == this); 440 return; 441 case WM_NCACTIVATE: 442 DrawCaption(m.HWnd, m.WParam.ToInt32() > 0); 443 return; 444 case WM_NCRBUTTONDOWN: { 445 int posX, posY; 446 int wp = m.WParam.ToInt32(); 447 long lp = m.LParam.ToInt64(); 448 posX = LOBYTE(lp); 449 posY = HIBYTE(lp); 450 451 if (wp == HTCAPTION) { 452 Point pt = this.PointToClient(new Point(posX, posY)); 453 if (this.CaptionContextMenu != null) { 454 this.CaptionContextMenu.Show(posX, posY); 455 return; 456 } 457 } 458 break; 459 } 460 case WM_SETCURSOR: 461 if (this.ControlBox) { 462 int posX, posY; 463 int wp = m.WParam.ToInt32(); 464 long lp = m.LParam.ToInt64(); 465 posX = LOBYTE(lp); 466 posY = HIBYTE(lp); 467 468 Brush backgroundColor = new SolidBrush(CaptionBackgroundColor); 469 _NonClientSizeInfo ncInfo = GetNonClientInfo(m.HWnd); 470 IntPtr dc = GetWindowDC(m.HWnd); 471 472 Graphics g = Graphics.FromHdc(dc); 473 int closeBtnPosX = ncInfo.CaptionRect.Left + ncInfo.CaptionRect.Width - ncInfo.BorderSize.Width - ncInfo.CaptionButtonSize.Width; 474 int maxBtnPosX, minBtnPosX; 475 maxBtnPosX = closeBtnPosX - ncInfo.CaptionButtonSize.Width; 476 minBtnPosX = maxBtnPosX - ncInfo.CaptionButtonSize.Width; 477 478 int btnPosY = ncInfo.BorderSize.Height + (ncInfo.CaptionHeight - ncInfo.CaptionButtonSize.Height) / 2; 479 480 Rectangle btnRect = new Rectangle(new Point(closeBtnPosX, btnPosY), ncInfo.CaptionButtonSize); 481 Rectangle maxRect = new Rectangle(new Point(maxBtnPosX, btnPosY), ncInfo.CaptionButtonSize); 482 Rectangle minRect = new Rectangle(new Point(minBtnPosX, btnPosY), ncInfo.CaptionButtonSize); 483 484 g.FillRectangle(backgroundColor, btnRect); 485 g.FillRectangle(backgroundColor, maxRect); 486 g.FillRectangle(backgroundColor, minRect); 487 488 if (posX != HTCLOSE) { 489 g.DrawImage(CloseButtonImage, btnRect); 490 } else if (MouseButtons != System.Windows.Forms.MouseButtons.Left) { 491 g.DrawImage(CloseButtonHoverImage, btnRect); 492 } else { 493 g.DrawImage(CloseButtonPressDownImage, btnRect); 494 } 495 496 if (this.MaximizeBox || this.MinimizeBox) { 497 if (this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.FixedToolWindow && 498 this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.SizableToolWindow) { 499 if (this.WindowState == FormWindowState.Maximized) { 500 if (this.MaximizeBox) { 501 if (posX != HTMAXBUTTON) { 502 g.DrawImage(MaximumNormalButtonImage, maxRect); 503 } else if (MouseButtons != System.Windows.Forms.MouseButtons.Left) { 504 g.DrawImage(MaximumNormalButtonHoverImage, maxRect); 505 } else { 506 g.DrawImage(MaximumNormalButtonPressDownImage, maxRect); 507 } 508 } else { 509 g.DrawImage(MaximumNormalButtonImage, maxRect); 510 } 511 } else { 512 if (this.MaximizeBox) { 513 if (posX != HTMAXBUTTON) { 514 g.DrawImage(MaximumButtonImage, maxRect); 515 } else if (MouseButtons != System.Windows.Forms.MouseButtons.Left) { 516 g.DrawImage(MaximumButtonHoverImage, maxRect); 517 } else { 518 g.DrawImage(MaximumButtonPressDownImage, maxRect); 519 } 520 } else { 521 g.DrawImage(MaximumButtonImage, maxRect); 522 } 523 } 524 525 if (this.MinimizeBox) { 526 if (posX != HTMINBUTTON) { 527 g.DrawImage(MinimumButtonImage, minRect); 528 } else if (MouseButtons != System.Windows.Forms.MouseButtons.Left) { 529 g.DrawImage(MinimumButtonHoverImage, minRect); 530 } else { 531 g.DrawImage(MinimumButtonPressDownImage, minRect); 532 } 533 } else { 534 g.DrawImage(MinimumButtonImage, minRect); 535 } 536 } 537 } else if (this.HelpButton) { 538 if (this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.FixedToolWindow && 539 this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.SizableToolWindow) { 540 if (posX != HTHELP) { 541 g.DrawImage(HelpButtonImage, maxRect); 542 } else if (MouseButtons != System.Windows.Forms.MouseButtons.Left) { 543 g.DrawImage(HelpButtonHoverImage, maxRect); 544 } else { 545 g.DrawImage(HelpButtonPressDownImage, maxRect); 546 } 547 } 548 } 549 550 g.Dispose(); 551 ReleaseDC(m.HWnd, dc); 552 } 553 break; 554 case WM_NCLBUTTONUP: { 555 int wp = m.WParam.ToInt32(); 556 switch (wp) { 557 case HTCLOSE: 558 m.Msg = WM_SYSCOMMAND; 559 m.WParam = new IntPtr(SC_CLOSE); 560 break; 561 case HTMAXBUTTON: 562 if (this.MaximizeBox) { 563 m.Msg = WM_SYSCOMMAND; 564 if (this.WindowState == FormWindowState.Maximized) { 565 m.WParam = new IntPtr(SC_RESTORE); 566 } else { 567 m.WParam = new IntPtr(SC_MAXIMIZE); 568 } 569 } 570 break; 571 case HTMINBUTTON: 572 if (this.MinimizeBox) { 573 m.Msg = WM_SYSCOMMAND; 574 m.WParam = new IntPtr(SC_MINIMIZE); 575 } 576 break; 577 case HTHELP: 578 m.Msg = WM_SYSCOMMAND; 579 m.WParam = new IntPtr(SC_CONTEXTHELP); 580 break; 581 default: 582 break; 583 } 584 break; 585 } 586 587 case WM_NCLBUTTONDOWN: 588 if (this.ControlBox) { 589 bool ret = false; 590 int posX, posY; 591 int wp = m.WParam.ToInt32(); 592 long lp = m.LParam.ToInt64(); 593 posX = LOBYTE(lp); 594 posY = HIBYTE(lp); 595 596 _NonClientSizeInfo ncInfo = GetNonClientInfo(m.HWnd); 597 IntPtr dc = GetWindowDC(m.HWnd); 598 Brush backgroundColor = new SolidBrush(CaptionBackgroundColor); 599 600 Graphics g = Graphics.FromHdc(dc); 601 int closeBtnPosX = ncInfo.CaptionRect.Left + ncInfo.CaptionRect.Width - ncInfo.BorderSize.Width - ncInfo.CaptionButtonSize.Width; 602 int maxBtnPosX, minBtnPosX; 603 int btnPosY = ncInfo.BorderSize.Height + (ncInfo.CaptionHeight - ncInfo.CaptionButtonSize.Height) / 2; 604 maxBtnPosX = closeBtnPosX - ncInfo.CaptionButtonSize.Width; 605 minBtnPosX = maxBtnPosX - ncInfo.CaptionButtonSize.Width; 606 607 Rectangle btnRect = new Rectangle(new Point(closeBtnPosX, btnPosY), ncInfo.CaptionButtonSize); 608 Rectangle maxRect = new Rectangle(new Point(maxBtnPosX, btnPosY), ncInfo.CaptionButtonSize); 609 Rectangle minRect = new Rectangle(new Point(minBtnPosX, btnPosY), ncInfo.CaptionButtonSize); 610 611 g.FillRectangle(backgroundColor, btnRect); 612 g.FillRectangle(backgroundColor, maxRect); 613 g.FillRectangle(backgroundColor, minRect); 614 615 if (wp == HTCLOSE) { 616 g.DrawImage(CloseButtonPressDownImage, btnRect); 617 ret = true; 618 } else { 619 g.DrawImage(CloseButtonImage, btnRect); 620 } 621 622 if (this.MaximizeBox || this.MinimizeBox) { 623 if (this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.SizableToolWindow && 624 this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.FixedToolWindow) { 625 if (this.WindowState == FormWindowState.Maximized) { 626 if (wp == HTMAXBUTTON && this.MaximizeBox) { 627 minBtnPosX = maxBtnPosX - ncInfo.CaptionButtonSize.Width; 628 g.DrawImage(MaximumNormalButtonPressDownImage, maxRect); 629 ret = true; 630 } else { 631 g.DrawImage(MaximumNormalButtonImage, maxRect); 632 } 633 } else { 634 if (wp == HTMAXBUTTON && this.MaximizeBox) { 635 minBtnPosX = maxBtnPosX - ncInfo.CaptionButtonSize.Width; 636 g.DrawImage(MaximumButtonPressDownImage, maxRect); 637 ret = true; 638 } else { 639 g.DrawImage(MaximumButtonImage, maxRect); 640 } 641 } 642 if (wp == HTMINBUTTON && this.MinimizeBox) { 643 g.DrawImage(MinimumButtonPressDownImage, minRect); 644 ret = true; 645 } else { 646 g.DrawImage(MinimumButtonImage, minRect); 647 } 648 } 649 } else if (this.HelpButton) { 650 if (this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.FixedToolWindow && 651 this.FormBorderStyle != System.Windows.Forms.FormBorderStyle.SizableToolWindow) { 652 if (wp == HTHELP) { 653 g.DrawImage(HelpButtonPressDownImage, maxRect); 654 ret = true; 655 } else { 656 g.DrawImage(HelpButtonImage, maxRect); 657 } 658 } 659 } 660 661 g.Dispose(); 662 ReleaseDC(m.HWnd, dc); 663 664 if (ret) 665 return; 666 } 667 break; 668 } 669 } 670 671 base.WndProc(ref m); 672 } 673 674 #endregion 675 } 676 }
原文：http://www.cnblogs.com/ssdnif/p/5040530.html