mcs/class/System.Windows.Forms/System.Windows.Forms/InternalWindowManager.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Jackson Harper (jackson@ximian.com)
  24 //
  25 //
  26
  27
  28 using System;
  29 using System.Drawing;
  30 using System.Runtime.InteropServices;
  31
  32
  33 namespace System.Windows.Forms {
  34
  35         internal abstract class InternalWindowManager {
  36                 private TitleButtons title_buttons;
  37                 internal Form form;
  38
  39                 // moving windows
  40                 internal Point start;
  41                 internal State state;
  42                 protected Point clicked_point;
  43                 private FormPos sizing_edge;
  44                 internal Rectangle virtual_position;
  45
  46                 private Rectangle normal_bounds;
  47                 private Rectangle iconic_bounds;
  48
  49
  50                 public enum State {
  51                         Idle,
  52                         Moving,
  53                         Sizing,
  54                 }
  55
  56                 [Flags]
  57                 public enum FormPos {
  58                         None,
  59
  60                         TitleBar = 1,
  61
  62                         Top = 2,
  63                         Left = 4,
  64                         Right = 8,
  65                         Bottom = 16,
  66
  67                         TopLeft = Top | Left,
  68                         TopRight = Top | Right,
  69
  70                         BottomLeft = Bottom | Left,
  71                         BottomRight = Bottom | Right,
  72
  73                         AnyEdge = Top | Left | Right | Bottom,
  74                 }
  75
  76                 public InternalWindowManager (Form form)
  77                 {
  78                         this.form = form;
  79
  80                         form.SizeChanged += new EventHandler (FormSizeChangedHandler);
  81
  82                         title_buttons = new TitleButtons (form);
  83                         ThemeEngine.Current.ManagedWindowSetButtonLocations (this);
  84                 }
  85
  86                 public Form Form {
  87                         get { return form; }
  88                 }
  89
  90                 public int IconWidth {
  91                         get { return TitleBarHeight - 5; }
  92                 }
  93
  94                 public TitleButtons TitleButtons {
  95                         get {
  96                                 return title_buttons;
  97                         }
  98                 }
  99                 internal Rectangle NormalBounds {
 100                         get {
 101                                 return normal_bounds;
 102                         }
 103                         set {
 104                                 normal_bounds = value;
 105                         }
 106                 }
 107                 internal Size IconicSize {
 108                         get {
 109                                 return SystemInformation.MinimizedWindowSize;
 110                         }
 111                 }
 112
 113                 internal Rectangle IconicBounds {
 114                         get {
 115                                 if (iconic_bounds == Rectangle.Empty)
 116                                         return Rectangle.Empty;
 117                                 Rectangle result = iconic_bounds;
 118                                 result.Y = Form.Parent.ClientRectangle.Bottom - iconic_bounds.Y;
 119                                 return result;
 120                         }
 121                         set {
 122                                 iconic_bounds = value;
 123                                 iconic_bounds.Y = Form.Parent.ClientRectangle.Bottom - iconic_bounds.Y;
 124                         }
 125                 }
 126
 127                 internal virtual Rectangle MaximizedBounds {
 128                         get {
 129                                 return Form.Parent.ClientRectangle;
 130                         }
 131                 }
 132
 133                 public virtual void UpdateWindowState (FormWindowState old_window_state, FormWindowState new_window_state, bool force)
 134                 {
 135                         if (old_window_state == FormWindowState.Normal) {
 136                                 NormalBounds = form.Bounds;
 137                         } else if (old_window_state == FormWindowState.Minimized) {
 138                                 IconicBounds = form.Bounds;
 139                         }
 140
 141                         switch (new_window_state) {
 142                         case FormWindowState.Minimized:
 143                                 if (IconicBounds == Rectangle.Empty) {
 144                                         Size size = IconicSize;
 145                                         Point location = new Point (0, Form.Parent.ClientSize.Height - size.Height);
 146                                         IconicBounds = new Rectangle (location, size);
 147                                 }
 148                                 form.Bounds = IconicBounds;
 149                                 break;
 150                         case FormWindowState.Maximized:
 151                                 form.Bounds = MaximizedBounds;
 152                                 break;
 153                         case FormWindowState.Normal:
 154                                 form.Bounds = NormalBounds;
 155                                 break;
 156                         }
 157
 158                         UpdateWindowDecorations (new_window_state);
 159                         form.ResetCursor ();
 160                 }
 161
 162                 public virtual void UpdateWindowDecorations (FormWindowState window_state)
 163                 {
 164                         ThemeEngine.Current.ManagedWindowSetButtonLocations (this);
 165                         if (form.IsHandleCreated)
 166                                 XplatUI.RequestNCRecalc (form.Handle);
 167                 }
 168
 169                 public virtual bool WndProc (ref Message m)
 170                 {
 171 #if debug
 172                         Console.WriteLine(DateTime.Now.ToLongTimeString () + " " + this.GetType () .Name + " (Handle={0},Text={1}) received message {2}", form.IsHandleCreated ? form.Handle : IntPtr.Zero,  form.Text, m.ToString ());
 173 #endif
 174
 175                         switch ((Msg)m.Msg) {
 176
 177
 178                                 // The mouse handling messages are actually
 179                                 // not WM_NC* messages except for the first button and NCMOVEs
 180                                 // down because we capture on the form
 181
 182                         case Msg.WM_MOUSEMOVE:
 183                                 return HandleMouseMove (form, ref m);
 184
 185                         case Msg.WM_LBUTTONUP:
 186                                 HandleLButtonUp (ref m);
 187                                 break;
 188
 189                         case Msg.WM_RBUTTONDOWN:
 190                                 return HandleRButtonDown (ref m);
 191
 192                         case Msg.WM_LBUTTONDOWN:
 193                                 return HandleLButtonDown (ref m);
 194
 195                         case Msg.WM_LBUTTONDBLCLK:
 196                                 return HandleLButtonDblClick (ref m);
 197
 198                         case Msg.WM_PARENTNOTIFY:
 199                                 if (Control.LowOrder(m.WParam.ToInt32()) == (int) Msg.WM_LBUTTONDOWN)
 200                                         Activate ();
 201                                 break;
 202
 203                         case Msg.WM_NCHITTEST:
 204                                 return HandleNCHitTest (ref m);
 205
 206                                 // Return true from these guys, otherwise win32 will mess up z-order
 207                         case Msg.WM_NCLBUTTONUP:
 208                                 HandleNCLButtonUp (ref m);
 209                                 return true;
 210
 211                         case Msg.WM_NCLBUTTONDOWN:
 212                                 HandleNCLButtonDown (ref m);
 213                                 return true;
 214
 215                         case Msg.WM_NCMOUSEMOVE:
 216                                 HandleNCMouseMove (ref m);
 217                                 return true;
 218
 219                         case Msg.WM_NCLBUTTONDBLCLK:
 220                                 HandleNCLButtonDblClick (ref m);
 221                                 break;
 222
 223                         case Msg.WM_NCMOUSELEAVE:
 224                                 HandleNCMouseLeave (ref m);
 225                                 break;
 226
 227                         case Msg.WM_MOUSELEAVE:
 228                                 HandleMouseLeave (ref m);
 229                                 break;
 230
 231                         case Msg.WM_NCCALCSIZE:
 232                                 return HandleNCCalcSize (ref m);
 233
 234                         case Msg.WM_NCPAINT:
 235                                 return HandleNCPaint (ref m);
 236                         }
 237
 238                         return false;
 239                 }
 240
 241                 protected virtual bool HandleNCPaint (ref Message m)
 242                 {
 243                         PaintEventArgs pe = XplatUI.PaintEventStart (ref m, form.Handle, false);
 244
 245                         Rectangle clip;
 246
 247                         if (form.ActiveMenu != null) {
 248                                 Point pnt;
 249
 250                                 pnt = GetMenuOrigin ();
 251
 252                                 // The entire menu has to be in the clip rectangle because the
 253                                 // control buttons are right-aligned and otherwise they would
 254                                 // stay painted when the window gets resized.
 255                                 clip = new Rectangle (pnt.X, pnt.Y, form.ClientSize.Width, 0);
 256                                 clip = Rectangle.Union (clip, pe.ClipRectangle);
 257                                 pe.SetClip (clip);
 258                                 pe.Graphics.SetClip (clip);
 259
 260                                 form.ActiveMenu.Draw (pe, new Rectangle (pnt.X, pnt.Y, form.ClientSize.Width, 0));
 261                         }
 262                         if (HasBorders || IsMinimized && !(Form.IsMdiChild && IsMaximized)) {
 263                                 // clip region is not correct on win32.
 264                                 // use the entire form's area.
 265                                 clip = new Rectangle (0, 0, form.Width, form.Height);
 266                                 ThemeEngine.Current.DrawManagedWindowDecorations (pe.Graphics, clip, this);
 267                         }
 268                         XplatUI.PaintEventEnd (ref m, form.Handle, false);
 269                         return true;
 270                 }
 271
 272                 protected virtual bool HandleNCCalcSize (ref Message m)
 273                 {
 274                         XplatUIWin32.NCCALCSIZE_PARAMS ncp;
 275                         XplatUIWin32.RECT rect;
 276
 277                         if (m.WParam == (IntPtr)1) {
 278                                 ncp = (XplatUIWin32.NCCALCSIZE_PARAMS)Marshal.PtrToStructure (m.LParam,
 279                                                 typeof (XplatUIWin32.NCCALCSIZE_PARAMS));
 280
 281                                 ncp.rgrc1 = NCCalcSize (ncp.rgrc1);
 282
 283                                 Marshal.StructureToPtr (ncp, m.LParam, true);
 284                         } else {
 285                                 rect = (XplatUIWin32.RECT) Marshal.PtrToStructure (m.LParam, typeof (XplatUIWin32.RECT));
 286
 287                                 rect = NCCalcSize (rect);
 288
 289                                 Marshal.StructureToPtr (rect, m.LParam, true);
 290                         }
 291
 292                         return true;
 293                 }
 294
 295                 protected virtual XplatUIWin32.RECT NCCalcSize (XplatUIWin32.RECT proposed_window_rect)
 296                 {
 297                         int bw = ThemeEngine.Current.ManagedWindowBorderWidth (this);
 298
 299                         if (HasBorders) {
 300                                 proposed_window_rect.top += TitleBarHeight + bw;
 301                                 proposed_window_rect.bottom -= bw;
 302                                 proposed_window_rect.left += bw;
 303                                 proposed_window_rect.right -= bw;
 304                         }
 305
 306                         if (XplatUI.RequiresPositiveClientAreaSize) {
 307                                 // This is necessary for Linux, can't handle <= 0-sized
 308                                 // client areas correctly.
 309                                 if (proposed_window_rect.right <= proposed_window_rect.left) {
 310                                         proposed_window_rect.right += proposed_window_rect.left - proposed_window_rect.right + 1;
 311                                 }
 312                                 if (proposed_window_rect.top >= proposed_window_rect.bottom) {
 313                                         proposed_window_rect.bottom += proposed_window_rect.top - proposed_window_rect.bottom + 1;
 314                                 }
 315                         }
 316
 317                         return proposed_window_rect;
 318                 }
 319
 320                 protected virtual bool HandleNCHitTest (ref Message m)
 321                 {
 322
 323                         int x = Control.LowOrder ((int)m.LParam.ToInt32 ());
 324                         int y = Control.HighOrder ((int)m.LParam.ToInt32 ());
 325
 326                         NCPointToClient (ref x, ref y);
 327
 328                         FormPos pos = FormPosForCoords (x, y);
 329
 330                         if (pos == FormPos.TitleBar) {
 331                                 m.Result = new IntPtr ((int)HitTest.HTCAPTION);
 332                                 return true;
 333                         }
 334
 335                         if (!IsSizable)
 336                                 return false;
 337
 338                         switch (pos) {
 339                         case FormPos.Top:
 340                                 m.Result = new IntPtr ((int)HitTest.HTTOP);
 341                                 break;
 342                         case FormPos.Left:
 343                                 m.Result = new IntPtr ((int)HitTest.HTLEFT);
 344                                 break;
 345                         case FormPos.Right:
 346                                 m.Result = new IntPtr ((int)HitTest.HTRIGHT);
 347                                 break;
 348                         case FormPos.Bottom:
 349                                 m.Result = new IntPtr ((int)HitTest.HTBOTTOM);
 350                                 break;
 351                         case FormPos.TopLeft:
 352                                 m.Result = new IntPtr ((int)HitTest.HTTOPLEFT);
 353                                 break;
 354                         case FormPos.TopRight:
 355                                 m.Result = new IntPtr ((int)HitTest.HTTOPRIGHT);
 356                                 break;
 357                         case FormPos.BottomLeft:
 358                                 m.Result = new IntPtr ((int)HitTest.HTBOTTOMLEFT);
 359                                 break;
 360                         case FormPos.BottomRight:
 361                                 m.Result = new IntPtr ((int)HitTest.HTBOTTOMRIGHT);
 362                                 break;
 363                         default:
 364                                 // We return false so that DefWndProc handles things
 365                                 return false;
 366                         }
 367                         return true;
 368                 }
 369
 370                 public virtual void UpdateBorderStyle (FormBorderStyle border_style)
 371                 {
 372                         if (form.IsHandleCreated) {
 373                                 XplatUI.SetBorderStyle (form.Handle, border_style);
 374                         }
 375
 376                         if (ShouldRemoveWindowManager (border_style)) {
 377                                 form.RemoveWindowManager ();
 378                                 return;
 379                         }
 380
 381                         ThemeEngine.Current.ManagedWindowSetButtonLocations (this);
 382                 }
 383
 384
 385
 386                 public virtual void SetWindowState (FormWindowState old_state, FormWindowState window_state)
 387                 {
 388                         UpdateWindowState (old_state, window_state, false);
 389                 }
 390
 391                 public virtual FormWindowState GetWindowState ()
 392                 {
 393                         return form.window_state;
 394                 }
 395
 396                 public virtual void PointToClient (ref int x, ref int y)
 397                 {
 398                         // toolwindows stay in screencoords we just have to make sure
 399                         // they obey the working area
 400                         Rectangle working = SystemInformation.WorkingArea;
 401
 402                         if (x > working.Right)
 403                                 x = working.Right;
 404                         if (x < working.Left)
 405                                 x = working.Left;
 406
 407                         if (y < working.Top)
 408                                 y = working.Top;
 409                         if (y > working.Bottom)
 410                                 y = working.Bottom;
 411                 }
 412
 413                 public virtual void PointToScreen (ref int x, ref int y)
 414                 {
 415                         XplatUI.ClientToScreen (form.Handle, ref x, ref y);
 416                 }
 417
 418                 protected virtual bool ShouldRemoveWindowManager (FormBorderStyle style)
 419                 {
 420                         return style != FormBorderStyle.FixedToolWindow && style != FormBorderStyle.SizableToolWindow;
 421                 }
 422
 423                 public bool IconRectangleContains (int x, int y)
 424                 {
 425                         if (!ShowIcon)
 426                                 return false;
 427
 428                         Rectangle icon = ThemeEngine.Current.ManagedWindowGetTitleBarIconArea (this);
 429                         return icon.Contains (x, y);
 430                 }
 431
 432                 public bool ShowIcon {
 433                         get {
 434                                 if (!Form.ShowIcon)
 435                                         return false;
 436                                 if (!HasBorders)
 437                                         return false;
 438                                 if (IsMinimized)
 439                                         return true;
 440                                 if (IsToolWindow || Form.FormBorderStyle == FormBorderStyle.FixedDialog)
 441                                         return false;
 442                                 return true;
 443                         }
 444                 }
 445
 446                 protected virtual void Activate ()
 447                 {
 448                         form.Invalidate (true);
 449                         form.Update ();
 450                 }
 451
 452                 public virtual bool IsActive {
 453                         get {
 454                                 return true;
 455                         }
 456                 }
 457
 458
 459                 private void FormSizeChangedHandler (object sender, EventArgs e)
 460                 {
 461                         if (form.IsHandleCreated) {
 462                                 ThemeEngine.Current.ManagedWindowSetButtonLocations (this);
 463                                 XplatUI.InvalidateNC (form.Handle);
 464                         }
 465                 }
 466
 467                 protected virtual bool HandleRButtonDown (ref Message m)
 468                 {
 469                         Activate ();
 470                         return false;
 471                 }
 472
 473                 protected virtual bool HandleLButtonDown (ref Message m)
 474                 {
 475                         Activate ();
 476                         return false;
 477                 }
 478
 479                 protected virtual bool HandleLButtonDblClick(ref Message m)
 480                 {
 481                         return false;
 482                 }
 483
 484                 protected virtual bool HandleNCMouseLeave (ref Message m)
 485                 {
 486                         int x = Control.LowOrder ((int)m.LParam.ToInt32 ());
 487                         int y = Control.HighOrder ((int)m.LParam.ToInt32 ());
 488
 489                         NCPointToClient (ref x, ref y);
 490                         FormPos pos = FormPosForCoords (x, y);
 491
 492                         if (pos != FormPos.TitleBar) {
 493                                 HandleTitleBarLeave (x, y);
 494                                 return true;
 495                         }
 496
 497                         return true;
 498                 }
 499
 500                 protected virtual bool HandleNCMouseMove (ref Message m)
 501                 {
 502                         int x = Control.LowOrder((int)m.LParam.ToInt32( ));
 503                         int y = Control.HighOrder((int)m.LParam.ToInt32( ));
 504
 505                         NCPointToClient (ref x, ref y);
 506                         FormPos pos = FormPosForCoords (x, y);
 507
 508                         if (pos == FormPos.TitleBar) {
 509                                 HandleTitleBarMouseMove (x, y);
 510                                 return true;
 511                         }
 512
 513                         if (form.ActiveMenu != null && XplatUI.IsEnabled (form.Handle)) {
 514                                 MouseEventArgs mea = new MouseEventArgs (Form.FromParamToMouseButtons (m.WParam.ToInt32 ()), form.mouse_clicks, x, y, 0);
 515                                 form.ActiveMenu.OnMouseMove (form, mea);
 516                         }
 517
 518                         return true;
 519
 520                 }
 521
 522                 protected virtual bool HandleNCLButtonDown (ref Message m)
 523                 {
 524                         Activate ();
 525
 526                         start = Cursor.Position;
 527                         virtual_position = form.Bounds;
 528
 529                         int x = Control.LowOrder ((int) m.LParam.ToInt32 ());
 530                         int y = Control.HighOrder ((int) m.LParam.ToInt32 ());
 531
 532                         // Need to adjust because we are in NC land
 533                         NCPointToClient (ref x, ref y);
 534                         FormPos pos = FormPosForCoords (x, y);
 535
 536                         if (form.ActiveMenu != null && XplatUI.IsEnabled (form.Handle)) {
 537                                 MouseEventArgs mea = new MouseEventArgs (Form.FromParamToMouseButtons (m.WParam.ToInt32 ()), form.mouse_clicks, x, y - TitleBarHeight, 0);
 538                                 form.ActiveMenu.OnMouseDown (form, mea);
 539                         }
 540
 541                         if (pos == FormPos.TitleBar) {
 542                                 HandleTitleBarDown (x, y);
 543                                 return true;
 544                         }
 545
 546                         if (IsSizable) {
 547                                 if ((pos & FormPos.AnyEdge) == 0)
 548                                         return false;
 549
 550                                 virtual_position = form.Bounds;
 551                                 state = State.Sizing;
 552                                 sizing_edge = pos;
 553                                 form.Capture = true;
 554                                 return true;
 555                         }
 556
 557                         return false;
 558                 }
 559
 560                 protected virtual void HandleNCLButtonDblClick (ref Message m)
 561                 {
 562                         int x = Control.LowOrder ((int)m.LParam.ToInt32 ());
 563                         int y = Control.HighOrder ((int)m.LParam.ToInt32 ());
 564
 565                         // Need to adjust because we are in NC land
 566                         NCPointToClient (ref x, ref y);
 567
 568                         FormPos pos = FormPosForCoords (x, y);
 569                         if (pos == FormPos.TitleBar || pos == FormPos.Top)
 570                                 HandleTitleBarDoubleClick (x, y);
 571
 572                 }
 573
 574                 protected virtual void HandleTitleBarDoubleClick (int x, int y)
 575                 {
 576
 577                 }
 578
 579                 protected virtual void HandleTitleBarLeave (int x, int y)
 580                 {
 581                         title_buttons.MouseLeave (x, y);
 582                 }
 583
 584                 protected virtual void HandleTitleBarMouseMove (int x, int y)
 585                 {
 586                         if (title_buttons.MouseMove (x, y))
 587                                 XplatUI.InvalidateNC (form.Handle);
 588                 }
 589
 590                 protected virtual void HandleTitleBarUp (int x, int y)
 591                 {
 592                         title_buttons.MouseUp (x, y);
 593
 594                         return;
 595                 }
 596
 597                 protected virtual void HandleTitleBarDown (int x, int y)
 598                 {
 599                         title_buttons.MouseDown (x, y);
 600
 601                         if (!TitleButtons.AnyPushedTitleButtons && !IsMaximized) {
 602                                 state = State.Moving;
 603                                 clicked_point = new Point (x, y);
 604                                 if (form.Parent != null) {
 605                                         form.CaptureWithConfine (form.Parent);
 606                                 } else {
 607                                         form.Capture = true;
 608                                 }
 609                         }
 610
 611                         XplatUI.InvalidateNC (form.Handle);
 612                 }
 613
 614                 private bool HandleMouseMove (Form form, ref Message m)
 615                 {
 616                         switch (state) {
 617                         case State.Moving:
 618                                 HandleWindowMove (m);
 619                                 return true;
 620                         case State.Sizing:
 621                                 HandleSizing (m);
 622                                 return true;
 623                         }
 624
 625                         return false;
 626                 }
 627
 628                 private void HandleMouseLeave (ref Message m)
 629                 {
 630                         form.ResetCursor ();
 631                 }
 632
 633                 protected virtual void HandleWindowMove (Message m)
 634                 {
 635                         Point move = MouseMove (Cursor.Position);
 636
 637                         UpdateVP (virtual_position.X + move.X, virtual_position.Y + move.Y,
 638                                         virtual_position.Width, virtual_position.Height);
 639                 }
 640
 641                 private void HandleSizing (Message m)
 642                 {
 643                         Rectangle pos = virtual_position;
 644                         int mw;
 645                         int mh;
 646                         if (IsToolWindow) {
 647                                 int border_width = BorderWidth;
 648                                 mw = 2 * (border_width + Theme.ManagedWindowSpacingAfterLastTitleButton) + ThemeEngine.Current.ManagedWindowButtonSize (this).Width;
 649                                 mh = 2 * border_width + TitleBarHeight;
 650                         } else {
 651                                 Size minimum_size = SystemInformation.MinWindowTrackSize;
 652                                 mw = minimum_size.Width;
 653                                 mh = minimum_size.Height;
 654                         }
 655                         int x = Cursor.Position.X;
 656                         int y = Cursor.Position.Y;
 657
 658                         PointToClient (ref x, ref y);
 659
 660                         if ((sizing_edge & FormPos.Top) != 0) {
 661                                 if (pos.Bottom - y < mh)
 662                                         y = pos.Bottom - mh;
 663                                 pos.Height = pos.Bottom - y;
 664                                 pos.Y = y;
 665                         } else if ((sizing_edge & FormPos.Bottom) != 0) {
 666                                 int height = y - pos.Top;
 667                                 if (height <= mh)
 668                                         height = mh;
 669                                 pos.Height = height;
 670                         }
 671
 672                         if ((sizing_edge & FormPos.Left) != 0) {
 673                                 if (pos.Right - x < mw)
 674                                         x = pos.Right - mw;
 675                                 pos.Width = pos.Right - x;
 676                                 pos.X = x;
 677                         } else if ((sizing_edge & FormPos.Right) != 0) {
 678                                 int width = x - form.Left;
 679                                 if (width <= mw)
 680                                         width = mw;
 681                                 pos.Width = width;
 682                         }
 683
 684                         UpdateVP (pos);
 685                 }
 686
 687                 public bool IsMaximized {
 688                         get { return GetWindowState () == FormWindowState.Maximized; }
 689                 }
 690
 691                 public bool IsMinimized {
 692                         get { return GetWindowState () == FormWindowState.Minimized; }
 693                 }
 694
 695                 public bool IsSizable {
 696                         get {
 697                                 switch (form.FormBorderStyle) {
 698                                 case FormBorderStyle.Sizable:
 699                                 case FormBorderStyle.SizableToolWindow:
 700                                         return (form.window_state != FormWindowState.Minimized);
 701                                 default:
 702                                         return false;
 703                                 }
 704                         }
 705                 }
 706
 707                 public bool HasBorders {
 708                         get {
 709                                 return form.FormBorderStyle != FormBorderStyle.None;
 710                         }
 711                 }
 712
 713                 public bool IsToolWindow {
 714                         get {
 715                                 if (form.FormBorderStyle == FormBorderStyle.SizableToolWindow ||
 716                                     form.FormBorderStyle == FormBorderStyle.FixedToolWindow ||
 717                                     form.GetCreateParams().IsSet (WindowExStyles.WS_EX_TOOLWINDOW))
 718                                         return true;
 719                                 return false;
 720                         }
 721                 }
 722
 723                 public int TitleBarHeight {
 724                         get {
 725                                 return ThemeEngine.Current.ManagedWindowTitleBarHeight (this);
 726                         }
 727                 }
 728
 729                 public int BorderWidth {
 730                         get {
 731                                 return ThemeEngine.Current.ManagedWindowBorderWidth (this);
 732                         }
 733                 }
 734
 735                 public virtual int MenuHeight {
 736                         get {
 737                                 return (form.Menu != null ? ThemeEngine.Current.MenuHeight : 0);
 738                         }
 739                 }
 740
 741                 protected void UpdateVP (Rectangle r)
 742                 {
 743                         UpdateVP (r.X, r.Y, r.Width, r.Height);
 744                 }
 745
 746                 protected void UpdateVP (Point loc, int w, int h)
 747                 {
 748                         UpdateVP (loc.X, loc.Y, w, h);
 749                 }
 750
 751                 protected void UpdateVP (int x, int y, int w, int h)
 752                 {
 753                         virtual_position.X = x;
 754                         virtual_position.Y = y;
 755                         virtual_position.Width = w;
 756                         virtual_position.Height = h;
 757
 758                         DrawVirtualPosition (virtual_position);
 759                 }
 760
 761                 protected virtual void HandleLButtonUp (ref Message m)
 762                 {
 763                         if (state == State.Idle)
 764                                 return;
 765
 766                         ClearVirtualPosition ();
 767
 768                         form.Capture = false;
 769                         if (state == State.Moving && form.Location != virtual_position.Location)
 770                                 form.Location = virtual_position.Location;
 771                         else if (state == State.Sizing && form.Bounds != virtual_position)
 772                                 form.Bounds = virtual_position;
 773                         state = State.Idle;
 774
 775                         OnWindowFinishedMoving ();
 776                 }
 777
 778                 private bool HandleNCLButtonUp (ref Message m)
 779                 {
 780                         if (form.Capture) {
 781                                 ClearVirtualPosition ();
 782
 783                                 form.Capture = false;
 784                                 state = State.Idle;
 785                                 if (form.MdiContainer != null)
 786                                         form.MdiContainer.SizeScrollBars();
 787                         }
 788
 789                         int x = Control.LowOrder ((int) m.LParam.ToInt32 ());
 790                         int y = Control.HighOrder ((int) m.LParam.ToInt32 ());
 791
 792                         NCPointToClient (ref x, ref y);
 793                         FormPos pos = FormPosForCoords (x, y);
 794
 795                         if (pos == FormPos.TitleBar) {
 796                                 HandleTitleBarUp (x, y);
 797                                 return true;
 798                         }
 799
 800                         return true;
 801                 }
 802
 803                 protected void DrawTitleButton (Graphics dc, TitleButton button, Rectangle clip)
 804                 {
 805                         if (!button.Rectangle.IntersectsWith (clip))
 806                                 return;
 807
 808                         ThemeEngine.Current.ManagedWindowDrawMenuButton (dc, button, clip, this);
 809                 }
 810
 811                 public virtual void DrawMaximizedButtons (object sender, PaintEventArgs pe)
 812                 {
 813                 }
 814
 815                 protected Point MouseMove (Point pos)
 816                 {
 817                         return new Point (pos.X - start.X, pos.Y - start.Y);
 818                 }
 819
 820                 protected virtual void DrawVirtualPosition (Rectangle virtual_position)
 821                 {
 822                         form.Bounds = virtual_position;
 823                         start = Cursor.Position;
 824                 }
 825
 826                 protected virtual void ClearVirtualPosition ()
 827                 {
 828
 829                 }
 830
 831                 protected virtual void OnWindowFinishedMoving ()
 832                 {
 833                 }
 834
 835                 protected virtual void NCPointToClient(ref int x, ref int y) {
 836                         form.PointToClient(ref x, ref y);
 837                         NCClientToNC (ref x, ref y);
 838                 }
 839
 840                 protected virtual void NCClientToNC (ref int x, ref int y) {
 841                         y += TitleBarHeight;
 842                         y += BorderWidth;
 843                         y += MenuHeight;
 844                 }
 845
 846                 internal Point GetMenuOrigin ()
 847                 {
 848                         return new Point (BorderWidth, BorderWidth + TitleBarHeight);
 849                 }
 850
 851                 protected FormPos FormPosForCoords (int x, int y)
 852                 {
 853                         int bw = BorderWidth;
 854                         if (y < TitleBarHeight + bw) {
 855                                 //      Console.WriteLine ("A");
 856                                 if (y > bw && x > bw &&
 857                                                 x < form.Width - bw)
 858                                         return FormPos.TitleBar;
 859
 860                                 if (x < bw || (x < 20 && y < bw))
 861                                         return FormPos.TopLeft;
 862
 863                                 if (x > form.Width - bw ||
 864                                         (x > form.Width - 20 && y < bw))
 865                                         return FormPos.TopRight;
 866
 867                                 if (y < bw)
 868                                         return FormPos.Top;
 869
 870                         } else if (y > form.Height - 20) {
 871                                 //      Console.WriteLine ("B");
 872                                 if (x < bw ||
 873                                                 (x < 20 && y > form.Height - bw))
 874                                         return FormPos.BottomLeft;
 875
 876                                 if (x > form.Width - (bw * 2) ||
 877                                                 (x > form.Width - 20 &&
 878                                                  y > form.Height - bw))
 879                                         return FormPos.BottomRight;
 880
 881                                 if (y > form.Height - (bw * 2))
 882                                         return FormPos.Bottom;
 883
 884
 885                         } else if (x < bw) {
 886                                 //      Console.WriteLine ("C");
 887                                 return FormPos.Left;
 888                         } else if (x > form.Width - (bw * 2)) {
 889 //                              Console.WriteLine ("D");
 890                                 return FormPos.Right;
 891                         } else {
 892                                 //                      Console.WriteLine ("E   {0}", form.Width - bw);
 893                         }
 894
 895                         return FormPos.None;
 896                 }
 897         }
 898         internal class TitleButton
 899         {
 900                 public Rectangle Rectangle;
 901                 public ButtonState State;
 902                 public CaptionButton Caption;
 903                 private EventHandler Clicked;
 904                 public bool Visible;
 905                 bool entered;
 906
 907                 public TitleButton (CaptionButton caption, EventHandler clicked)
 908                 {
 909                         Caption = caption;
 910                         Clicked = clicked;
 911                 }
 912
 913                 public void OnClick ()
 914                 {
 915                         if (Clicked != null) {
 916                                 Clicked (this, EventArgs.Empty);
 917                         }
 918                 }
 919
 920                 public bool Entered {
 921                         get { return entered; }
 922                         set { entered = value; }
 923                 }
 924         }
 925
 926         internal class TitleButtons : System.Collections.IEnumerable
 927         {
 928                 public TitleButton MinimizeButton;
 929                 public TitleButton MaximizeButton;
 930                 public TitleButton RestoreButton;
 931                 public TitleButton CloseButton;
 932                 public TitleButton HelpButton;
 933
 934                 public TitleButton [] AllButtons;
 935                 public bool Visible;
 936
 937                 private ToolTip.ToolTipWindow tooltip;
 938                 private Timer tooltip_timer;
 939                 private TitleButton tooltip_hovered_button;
 940                 private TitleButton tooltip_hidden_button;
 941                 private const int tooltip_hide_interval = 3000;
 942                 private const int tooltip_show_interval = 1000;
 943                 private Form form;
 944
 945                 public TitleButtons (Form frm)
 946                 {
 947                         this.form = frm;
 948                         this.Visible = true;
 949
 950                         MinimizeButton = new TitleButton (CaptionButton.Minimize, new EventHandler (ClickHandler));
 951                         MaximizeButton = new TitleButton (CaptionButton.Maximize, new EventHandler (ClickHandler));
 952                         RestoreButton = new TitleButton (CaptionButton.Restore, new EventHandler (ClickHandler));
 953                         CloseButton = new TitleButton (CaptionButton.Close, new EventHandler (ClickHandler));
 954                         HelpButton = new TitleButton (CaptionButton.Help, new EventHandler (ClickHandler));
 955
 956                         AllButtons = new TitleButton [] { MinimizeButton, MaximizeButton, RestoreButton, CloseButton, HelpButton };
 957                 }
 958
 959                 private void ClickHandler (object sender, EventArgs e)
 960                 {
 961                         if (!Visible) {
 962                                 return;
 963                         }
 964
 965                         TitleButton button = (TitleButton) sender;
 966
 967                         switch (button.Caption) {
 968                                 case CaptionButton.Close:
 969                                         form.Close ();
 970                                         break;
 971                                 case CaptionButton.Help:
 972                                         Console.WriteLine ("Help not implemented.");
 973                                         break;
 974                                 case CaptionButton.Maximize:
 975                                         form.WindowState = FormWindowState.Maximized;
 976                                         break;
 977                                 case CaptionButton.Minimize:
 978                                         form.WindowState = FormWindowState.Minimized;
 979                                         break;
 980                                 case CaptionButton.Restore:
 981                                         form.WindowState = FormWindowState.Normal;
 982                                         break;
 983                         }
 984                 }
 985
 986                 public TitleButton FindButton (int x, int y)
 987                 {
 988                         if (!Visible) {
 989                                 return null;
 990                         }
 991
 992                         foreach (TitleButton button in AllButtons) {
 993                                 if (button.Visible && button.Rectangle.Contains (x, y)) {
 994                                         return button;
 995                                 }
 996                         }
 997                         return null;
 998                 }
 999
1000                 public bool AnyPushedTitleButtons {
1001                         get {
1002                                 if (!Visible) {
1003                                         return false;
1004                                 }
1005
1006                                 foreach (TitleButton button in AllButtons) {
1007                                         if (button.Visible && button.State == ButtonState.Pushed) {
1008                                                 return true;
1009                                         }
1010                                 }
1011                                 return false;
1012                         }
1013                 }
1014
1015                 #region IEnumerable Members
1016
1017                 public System.Collections.IEnumerator GetEnumerator ()
1018                 {
1019                         return AllButtons.GetEnumerator ();
1020                 }
1021                 #endregion
1022
1023                 #region ToolTip helpers
1024                 // Called from MouseMove if mouse is over a button
1025                 public void ToolTipStart (TitleButton button)
1026                 {
1027                         tooltip_hovered_button = button;
1028
1029                         if (tooltip_hovered_button == tooltip_hidden_button)
1030                                 return;
1031                         tooltip_hidden_button = null;
1032
1033                         if (tooltip != null && tooltip.Visible)
1034                                 ToolTipShow (true);
1035
1036                         if (tooltip_timer == null) {
1037
1038                                 tooltip_timer = new Timer ();
1039                                 tooltip_timer.Tick += new EventHandler (ToolTipTimerTick);
1040                         }
1041
1042                         tooltip_timer.Interval = tooltip_show_interval;
1043                         tooltip_timer.Start ();
1044                         tooltip_hovered_button = button;
1045                 }
1046
1047                 public void ToolTipTimerTick (object sender, EventArgs e)
1048                 {
1049                         if (tooltip_timer.Interval == tooltip_hide_interval) {
1050                                 tooltip_hidden_button = tooltip_hovered_button;
1051                                 ToolTipHide (false);
1052                         } else {
1053                                 ToolTipShow (false);
1054                         }
1055                 }
1056                 // Called from timer (with only_refresh = false)
1057                 // Called from ToolTipStart if tooltip is already shown (with only_refresh = true)
1058                 public void ToolTipShow (bool only_refresh)
1059                 {
1060                         if (!form.Visible)
1061                                 return;
1062
1063                         string text = Locale.GetText (tooltip_hovered_button.Caption.ToString ());
1064
1065                         tooltip_timer.Interval = tooltip_hide_interval;
1066                         tooltip_timer.Enabled = true;
1067
1068                         if (only_refresh && (tooltip == null || !tooltip.Visible)) {
1069                                 return;
1070                         }
1071
1072                         if (tooltip == null)
1073                                 tooltip = new ToolTip.ToolTipWindow ();
1074                         else if (tooltip.Text == text && tooltip.Visible)
1075                                 return;
1076                         else if (tooltip.Visible)
1077                                 tooltip.Visible = false;
1078
1079                         if (form.WindowState == FormWindowState.Maximized && form.MdiParent != null)
1080                                 tooltip.Present (form.MdiParent, text);
1081                         else
1082                                 tooltip.Present (form, text);
1083
1084                 }
1085
1086                 // Called from MouseLeave (with reset_hidden_button = true)
1087                 // Called from MouseDown  (with reset_hidden_button = false)
1088                 // Called from MouseMove if mouse isn't over any button (with reset_hidden_button = false)
1089                 // Called from Timer if hiding (with reset_hidden_button = false)
1090                 public void ToolTipHide (bool reset_hidden_button)
1091                 {
1092                         if (tooltip_timer != null)
1093                                 tooltip_timer.Enabled = false;
1094                         if (tooltip != null && tooltip.Visible)
1095                                 tooltip.Visible = false;
1096                         if (reset_hidden_button)
1097                                 tooltip_hidden_button = null;
1098                 }
1099                 #endregion
1100
1101                 public bool MouseMove (int x, int y)
1102                 {
1103                         if (!Visible) {
1104                                 return false;
1105                         }
1106
1107                         bool any_change = false;
1108                         bool any_pushed_buttons = AnyPushedTitleButtons;
1109                         bool any_tooltip = false;
1110                         TitleButton over_button = FindButton (x, y);
1111
1112                         foreach (TitleButton button in this) {
1113                                 if (button == null)
1114                                         continue;
1115
1116                                 if (button.State == ButtonState.Inactive)
1117                                         continue;
1118
1119                                 if (button == over_button) {
1120                                         if (any_pushed_buttons) {
1121                                                 any_change |= button.State != ButtonState.Pushed;
1122                                                 button.State = ButtonState.Pushed;
1123                                         }
1124                                         ToolTipStart (button);
1125                                         any_tooltip = true;
1126                                         if (!button.Entered) {
1127                                                 button.Entered = true;
1128                                                 if (ThemeEngine.Current.ManagedWindowTitleButtonHasHotElementStyle (button, form))
1129                                                         any_change = true;
1130                                         }
1131                                 } else {
1132                                         if (any_pushed_buttons) {
1133                                                 any_change |= button.State != ButtonState.Normal;
1134                                                 button.State = ButtonState.Normal;
1135                                         }
1136                                         if (button.Entered) {
1137                                                 button.Entered = false;
1138                                                 if (ThemeEngine.Current.ManagedWindowTitleButtonHasHotElementStyle (button, form))
1139                                                         any_change = true;
1140                                         }
1141                                 }
1142                         }
1143
1144                         if (!any_tooltip)
1145                                 ToolTipHide (false);
1146
1147                         return any_change;
1148                 }
1149
1150                 public void MouseDown (int x, int y)
1151                 {
1152                         if (!Visible) {
1153                                 return;
1154                         }
1155
1156                         ToolTipHide (false);
1157
1158                         foreach (TitleButton button in this) {
1159                                 if (button != null && button.State != ButtonState.Inactive) {
1160                                         button.State = ButtonState.Normal;
1161                                 }
1162                         }
1163                         TitleButton clicked_button = FindButton (x, y);
1164                         if (clicked_button != null && clicked_button.State != ButtonState.Inactive) {
1165                                 clicked_button.State = ButtonState.Pushed;
1166                         }
1167                 }
1168
1169                 public void MouseUp (int x, int y)
1170                 {
1171                         if (!Visible) {
1172                                 return;
1173                         }
1174
1175                         TitleButton clicked_button = FindButton (x, y);
1176                         if (clicked_button != null && clicked_button.State != ButtonState.Inactive) {
1177                                 clicked_button.OnClick ();
1178                         }
1179
1180                         foreach (TitleButton button in this) {
1181                                 if (button == null || button.State == ButtonState.Inactive)
1182                                         continue;
1183
1184                                 button.State = ButtonState.Normal;
1185                         }
1186
1187                         if (clicked_button == CloseButton && !form.closing)
1188                                 XplatUI.InvalidateNC (form.Handle);
1189
1190                         ToolTipHide (true);
1191                 }
1192
1193                 internal void MouseLeave (int x, int y)
1194                 {
1195                         if (!Visible) {
1196                                 return;
1197                         }
1198
1199                         foreach (TitleButton button in this) {
1200                                 if (button == null || button.State == ButtonState.Inactive)
1201                                         continue;
1202
1203                                 button.State = ButtonState.Normal;
1204                         }
1205
1206                         ToolTipHide (true);
1207                 }
1208         }
1209 }
1210
1211