mcs/class/Managed.Windows.Forms/System.Windows.Forms/MenuAPI.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) 2004-2005 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jordi Mas i Hernandez, jordi@ximian.com
  24 //      Mike Kestner  <mkestner@novell.com>
  25 //      Everaldo Canuto  <ecanuto@novell.com>
  26 //
  27
  28 using System.Collections;
  29 using System.Drawing;
  30 using System.Threading;
  31
  32 namespace System.Windows.Forms {
  33
  34         /*
  35                 When writing this code the Wine project was of great help to
  36                 understand the logic behind some Win32 issues. Thanks to them. Jordi,
  37         */
  38         // UIA Framework Note: This class used by UIA for its mouse action methods.
  39         internal class MenuTracker {
  40
  41                 internal bool active;
  42                 internal bool popup_active;
  43                 internal bool popdown_menu;
  44                 internal bool hotkey_active;
  45                 private bool mouse_down = false;
  46                 public Menu CurrentMenu;
  47                 public Menu TopMenu;
  48                 public Control GrabControl;
  49                 Point last_motion = Point.Empty;
  50
  51             public MenuTracker (Menu top_menu)
  52                 {
  53                         TopMenu = CurrentMenu = top_menu;
  54                         foreach (MenuItem item in TopMenu.MenuItems)
  55                                 AddShortcuts (item);
  56                 }
  57
  58                 enum KeyNavState {
  59                         Idle,
  60                         Startup,
  61                         NoPopups,
  62                         Navigating
  63                 }
  64
  65                 KeyNavState keynav_state = KeyNavState.Idle;
  66
  67                 public bool Navigating {
  68                         get { return keynav_state != KeyNavState.Idle || active; }
  69                 }
  70
  71                 internal static Point ScreenToMenu (Menu menu, Point pnt)
  72                 {
  73                         int x = pnt.X;
  74                         int y = pnt.Y;
  75                         XplatUI.ScreenToMenu (menu.Wnd.window.Handle, ref x, ref y);
  76                         return new Point (x, y);
  77                 }
  78
  79                 private void UpdateCursor ()
  80                 {
  81                         Control child_control = GrabControl.GetRealChildAtPoint (Cursor.Position);
  82                         if (child_control != null) {
  83                                 if (active)
  84                                         XplatUI.SetCursor (child_control.Handle, Cursors.Default.handle);
  85                                 else
  86                                         XplatUI.SetCursor (child_control.Handle, child_control.Cursor.handle);
  87                         }
  88                 }
  89
  90                 internal void Deactivate ()
  91                 {
  92                         bool redrawbar = (keynav_state != KeyNavState.Idle) && (TopMenu is MainMenu);
  93
  94                         active = false;
  95                         popup_active = false;
  96                         hotkey_active = false;
  97                         if (GrabControl != null)
  98                                 GrabControl.ActiveTracker = null;
  99                         keynav_state = KeyNavState.Idle;
 100                         if (TopMenu is ContextMenu) {
 101                                 PopUpWindow puw = TopMenu.Wnd as PopUpWindow;
 102                                 DeselectItem (TopMenu.SelectedItem);
 103                                 if (puw != null)
 104                                         puw.HideWindow ();
 105                         } else {
 106                                 DeselectItem (TopMenu.SelectedItem);
 107                         }
 108                         CurrentMenu = TopMenu;
 109
 110                         if (redrawbar)
 111                                 (TopMenu as MainMenu).Draw ();
 112                 }
 113
 114                 MenuItem FindItemByCoords (Menu menu, Point pt)
 115                 {
 116                         if (menu is MainMenu)
 117                                 pt = ScreenToMenu (menu, pt);
 118                         else
 119                                 pt = menu.Wnd.PointToClient (pt);
 120                         foreach (MenuItem item in menu.MenuItems) {
 121                                 Rectangle rect = item.bounds;
 122                                 if (rect.Contains (pt))
 123                                         return item;
 124                         }
 125
 126                         return null;
 127                 }
 128
 129                 MenuItem GetItemAtXY (int x, int y)
 130                 {
 131                         Point pnt = new Point (x, y);
 132                         MenuItem item = null;
 133                         if (TopMenu.SelectedItem != null)
 134                                 item = FindSubItemByCoord (TopMenu.SelectedItem, Control.MousePosition);
 135                         if (item == null)
 136                                 item = FindItemByCoords (TopMenu, pnt);
 137                         return item;
 138                 }
 139
 140                 // UIA Framework Note: Used to expand/collapse MenuItems
 141                 public bool OnMouseDown (MouseEventArgs args)
 142                 {
 143                         MenuItem item = GetItemAtXY (args.X, args.Y);
 144
 145                         mouse_down = true;
 146
 147                         if (item == null) {
 148                                 Deactivate ();
 149                                 return false;
 150                         }
 151
 152                         if ((args.Button & MouseButtons.Left) == 0)
 153                                 return true;
 154
 155                         if (!item.Enabled)
 156                                 return true;
 157
 158                         popdown_menu = active && item.VisibleItems;
 159
 160                         if (item.IsPopup || (item.Parent is MainMenu)) {
 161                                 active = true;
 162                                 item.Parent.InvalidateItem (item);
 163                         }
 164
 165                         if ((CurrentMenu == TopMenu) && !popdown_menu)
 166                                 SelectItem (item.Parent, item, item.IsPopup);
 167
 168                         GrabControl.ActiveTracker = this;
 169                         return true;
 170                 }
 171
 172                 // UIA Framework Note: Used to select MenuItems
 173                 public void OnMotion (MouseEventArgs args)
 174                 {
 175                         // Windows helpfully sends us MOUSEMOVE messages when any key is pressed.
 176                         // So if the mouse hasn't actually moved since the last MOUSEMOVE, ignore it.
 177                         if (args.Location == last_motion)
 178                                 return;
 179
 180                         last_motion = args.Location;
 181
 182                         MenuItem item = GetItemAtXY (args.X, args.Y);
 183
 184                         UpdateCursor ();
 185
 186                         if (CurrentMenu.SelectedItem == item)
 187                                 return;
 188
 189                         GrabControl.ActiveTracker = (active || item != null) ? this : null;
 190
 191                         if (item == null) {
 192                                 MenuItem old_item = CurrentMenu.SelectedItem;
 193
 194                                 // Return when is a popup with visible subitems for MainMenu
 195                                 if  ((active && old_item.VisibleItems && old_item.IsPopup && (CurrentMenu is MainMenu)))
 196                                         return;
 197
 198                                 // Also returns when keyboard navigating
 199                                 if (keynav_state == KeyNavState.Navigating)
 200                                         return;
 201
 202                                 // Select parent menu when move outside of menu item
 203                                 if (old_item.Parent is MenuItem) {
 204                                         MenuItem new_item = (old_item.Parent as MenuItem);
 205                                         if (new_item.IsPopup) {
 206                                                 SelectItem (new_item.Parent, new_item, false);
 207                                                 return;
 208                                         }
 209                                 }
 210                                 if (CurrentMenu != TopMenu)
 211                                         CurrentMenu = CurrentMenu.parent_menu;
 212
 213                                 DeselectItem (old_item);
 214                         } else {
 215                                 keynav_state = KeyNavState.Idle;
 216                                 SelectItem (item.Parent, item, active && item.IsPopup && popup_active && (CurrentMenu.SelectedItem != item));
 217                         }
 218                 }
 219
 220                 // UIA Framework Note: Used to expand/collapse MenuItems
 221                 public void OnMouseUp (MouseEventArgs args)
 222                 {
 223                         /* mouse down dont comes from menu */
 224                         if (!mouse_down)
 225                                 return;
 226
 227                         mouse_down = false;
 228
 229                         /* is not left button */
 230                         if ((args.Button & MouseButtons.Left) == 0)
 231                                 return;
 232
 233                         MenuItem item = GetItemAtXY (args.X, args.Y);
 234
 235                         /* the user released the mouse button outside the menu */
 236                         if (item == null) {
 237                                 Deactivate ();
 238                                 return;
 239                         }
 240
 241                         if (!item.Enabled)
 242                                 return;
 243
 244                         /* Deactivate the menu when is topmenu and popdown and */
 245                         if (((CurrentMenu == TopMenu) && !(CurrentMenu is ContextMenu) && popdown_menu) || !item.IsPopup) {
 246                                 Deactivate ();
 247                                 UpdateCursor ();
 248                         }
 249
 250                         /* Perform click when is not a popup */
 251                         if (!item.IsPopup) {
 252                                 DeselectItem (item);
 253
 254                                 // Raise the form's MenuComplete event
 255                                 if (TopMenu != null && TopMenu.Wnd != null) {
 256                                         Form f = TopMenu.Wnd.FindForm ();
 257
 258                                         if (f != null)
 259                                                 f.OnMenuComplete (EventArgs.Empty);
 260                                 }
 261
 262                                 item.PerformClick ();
 263                         }
 264                 }
 265
 266                 static public bool TrackPopupMenu (Menu menu, Point pnt)
 267                 {
 268                         if (menu.MenuItems.Count <= 0)  // No submenus to track
 269                                 return true;
 270
 271                         MenuTracker tracker = menu.tracker;
 272                         tracker.active = true;
 273                         tracker.popup_active = true;
 274
 275                         // Set GrabControl
 276                         Control src_ctrl = (tracker.TopMenu as ContextMenu).SourceControl;
 277                         tracker.GrabControl = src_ctrl.FindForm ();
 278                         if (tracker.GrabControl == null)
 279                                 tracker.GrabControl = src_ctrl.FindRootParent ();
 280                         tracker.GrabControl.ActiveTracker = tracker;
 281
 282                         menu.Wnd = new PopUpWindow (tracker.GrabControl, menu);
 283                         menu.Wnd.Location =  menu.Wnd.PointToClient (pnt);
 284                         ((PopUpWindow)menu.Wnd).ShowWindow ();
 285
 286                         bool no_quit = true;
 287
 288                         Object queue_id = XplatUI.StartLoop(Thread.CurrentThread);
 289
 290                         while ((menu.Wnd != null) && menu.Wnd.Visible && no_quit) {
 291                                 MSG msg = new MSG ();
 292                                 no_quit = XplatUI.GetMessage(queue_id, ref msg, IntPtr.Zero, 0, 0);
 293
 294                                 switch((Msg)msg.message) {
 295                                 case Msg.WM_KEYDOWN:
 296                                 case Msg.WM_SYSKEYDOWN:
 297                                 case Msg.WM_CHAR:
 298                                 case Msg.WM_SYSCHAR:
 299                                 case Msg.WM_KEYUP:
 300                                 case Msg.WM_SYSKEYUP:
 301                                         Control c = Control.FromHandle(msg.hwnd);
 302                                         if (c != null) {
 303                                                 Message m = Message.Create(msg.hwnd, (int)msg.message, msg.wParam, msg.lParam);
 304                                                 c.PreProcessControlMessageInternal (ref m);
 305                                         }
 306                                         break;
 307                                 default:
 308                                         XplatUI.TranslateMessage (ref msg);
 309                                         XplatUI.DispatchMessage (ref msg);
 310                                         break;
 311                                 }
 312                         }
 313
 314                         if (tracker.GrabControl.IsDisposed)
 315                                 return true;
 316
 317                         if (!no_quit)
 318                                 XplatUI.PostQuitMessage(0);
 319
 320                         if (menu.Wnd != null) {
 321                                 menu.Wnd.Dispose ();
 322                                 menu.Wnd = null;
 323                         }
 324
 325                         return true;
 326                 }
 327
 328                 void DeselectItem (MenuItem item)
 329                 {
 330                         if (item == null)
 331                                 return;
 332
 333                         item.Selected = false;
 334
 335                         /* When popup item then close all sub popups and unselect all sub items */
 336                         if (item.IsPopup) {
 337                                 HideSubPopups (item, TopMenu);
 338
 339                                 /* Unselect all selected sub itens */
 340                                 foreach (MenuItem subitem in item.MenuItems)
 341                                         if (subitem.Selected)
 342                                                 DeselectItem (subitem);
 343                         }
 344
 345                         Menu menu = item.Parent;
 346                         menu.InvalidateItem (item);
 347                 }
 348
 349                 void SelectItem (Menu menu, MenuItem item, bool execute)
 350                 {
 351                         MenuItem prev_item = CurrentMenu.SelectedItem;
 352
 353                         if (prev_item != item.Parent) {
 354                                 DeselectItem (prev_item);
 355                                 if ((CurrentMenu != menu) && (prev_item.Parent != item) && (prev_item.Parent is MenuItem)) {
 356                                         DeselectItem (prev_item.Parent as MenuItem);
 357                                 }
 358                         }
 359
 360                         if (CurrentMenu != menu)
 361                                 CurrentMenu = menu;
 362
 363                         item.Selected = true;
 364                         menu.InvalidateItem (item);
 365
 366                         if (((CurrentMenu == TopMenu) && execute) || ((CurrentMenu != TopMenu) && popup_active))
 367                                 item.PerformSelect ();
 368
 369                         if ((execute) && ((prev_item == null) || (item != prev_item.Parent)))
 370                                 ExecFocusedItem (menu, item);
 371                 }
 372
 373                 //      Used when the user executes the action of an item (press enter, shortcut)
 374                 //      or a sub-popup menu has to be shown
 375                 void ExecFocusedItem (Menu menu, MenuItem item)
 376                 {
 377                         if (item == null)
 378                                 return;
 379
 380                         if (!item.Enabled)
 381                                 return;
 382
 383                         if (item.IsPopup) {
 384                                 ShowSubPopup (menu, item);
 385                         } else {
 386                                 Deactivate ();
 387                                 item.PerformClick ();
 388                         }
 389                 }
 390
 391                 // Create a popup window and show it or only show it if it is already created
 392                 void ShowSubPopup (Menu menu, MenuItem item)
 393                 {
 394                         if (item.Enabled == false)
 395                                 return;
 396
 397                         if (!popdown_menu || !item.VisibleItems)
 398                                 item.PerformPopup ();
 399
 400                         if (item.VisibleItems == false)
 401                                 return;
 402
 403                         if (item.Wnd != null) {
 404                                 item.Wnd.Dispose ();
 405                         }
 406
 407                         popup_active = true;
 408                         PopUpWindow puw = new PopUpWindow (GrabControl, item);
 409
 410                         Point pnt;
 411                         if (menu is MainMenu)
 412                                 pnt = new Point (item.X, item.Y + item.Height - 2 - menu.Height);
 413                         else
 414                                 pnt = new Point (item.X + item.Width - 3, item.Y - 3);
 415                         pnt = menu.Wnd.PointToScreen (pnt);
 416                         puw.Location = pnt;
 417                         item.Wnd = puw;
 418
 419                         puw.ShowWindow ();
 420                 }
 421
 422                 static public void HideSubPopups (Menu menu, Menu topmenu)
 423                 {
 424                         foreach (MenuItem item in menu.MenuItems)
 425                                 if (item.IsPopup)
 426                                         HideSubPopups (item, null);
 427
 428                         if (menu.Wnd == null)
 429                                 return;
 430
 431                         PopUpWindow puw = menu.Wnd as PopUpWindow;
 432                         if (puw != null) {
 433                                 puw.Hide ();
 434                                 puw.Dispose ();
 435                         }
 436                         menu.Wnd = null;
 437
 438 #if NET_2_0
 439                         if ((topmenu != null) && (topmenu is MainMenu))
 440                                 ((MainMenu) topmenu).OnCollapse (EventArgs.Empty);
 441 #endif
 442                 }
 443
 444                 MenuItem FindSubItemByCoord (Menu menu, Point pnt)
 445                 {
 446                         foreach (MenuItem item in menu.MenuItems) {
 447
 448                                 if (item.IsPopup && item.Wnd != null && item.Wnd.Visible && item == menu.SelectedItem) {
 449                                         MenuItem result = FindSubItemByCoord (item, pnt);
 450                                         if (result != null)
 451                                                 return result;
 452                                 }
 453
 454                                 if (menu.Wnd == null || !menu.Wnd.Visible)
 455                                         continue;
 456
 457                                 Rectangle rect = item.bounds;
 458                                 Point pnt_client = menu.Wnd.PointToScreen (new Point (item.X, item.Y));
 459                                 rect.X = pnt_client.X;
 460                                 rect.Y = pnt_client.Y;
 461
 462                                 if (rect.Contains (pnt) == true)
 463                                         return item;
 464                         }
 465
 466                         return null;
 467                 }
 468
 469                 static MenuItem FindItemByKey (Menu menu, IntPtr key)
 470                 {
 471                         char key_char = Char.ToUpper ((char) (key.ToInt32() & 0xff));
 472                         foreach (MenuItem item in menu.MenuItems) {
 473                                 if (item.Mnemonic == key_char)
 474                                         return item;
 475                         }
 476
 477                         string key_str = key_char.ToString ();
 478                         foreach (MenuItem item in menu.MenuItems) {
 479                                 //if (item.Mnemonic == key_char)
 480                                 if (item.Text.StartsWith (key_str))
 481                                         return item;
 482                         }
 483
 484                         return null;
 485                 }
 486
 487                 enum ItemNavigation {
 488                         First,
 489                         Last,
 490                         Next,
 491                         Previous,
 492                 }
 493
 494                 static MenuItem GetNextItem (Menu menu, ItemNavigation navigation)
 495                 {
 496                         int pos = 0;
 497                         bool selectable_items = false;
 498                         MenuItem item;
 499
 500                         // Check if there is at least a selectable item
 501                         for (int i = 0; i < menu.MenuItems.Count; i++) {
 502                                 item = menu.MenuItems [i];
 503                                 if (item.Separator == false && item.Visible == true) {
 504                                         selectable_items = true;
 505                                         break;
 506                                 }
 507                         }
 508
 509                         if (selectable_items == false)
 510                                 return null;
 511
 512                         switch (navigation) {
 513                         case ItemNavigation.First:
 514
 515                                 /* First item that is not separator and it is visible*/
 516                                 for (pos = 0; pos < menu.MenuItems.Count; pos++) {
 517                                         item = menu.MenuItems [pos];
 518                                         if (item.Separator == false && item.Visible == true)
 519                                                 break;
 520                                 }
 521
 522                                 break;
 523
 524                         case ItemNavigation.Last: // Not used
 525                                 break;
 526
 527                         case ItemNavigation.Next:
 528
 529                                 pos = menu.SelectedItem == null ? - 1 : menu.SelectedItem.Index;
 530
 531                                 /* Next item that is not separator and it is visible*/
 532                                 for (pos++; pos < menu.MenuItems.Count; pos++) {
 533                                         item = menu.MenuItems [pos];
 534                                         if (item.Separator == false && item.Visible == true)
 535                                                 break;
 536                                 }
 537
 538                                 if (pos >= menu.MenuItems.Count) { /* Jump at the start of the menu */
 539                                         pos = 0;
 540                                         /* Next item that is not separator and it is visible*/
 541                                         for (; pos < menu.MenuItems.Count; pos++) {
 542                                                 item = menu.MenuItems [pos];
 543                                                 if (item.Separator == false && item.Visible == true)
 544                                                         break;
 545                                         }
 546                                 }
 547                                 break;
 548
 549                         case ItemNavigation.Previous:
 550
 551                                 if (menu.SelectedItem != null)
 552                                         pos = menu.SelectedItem.Index;
 553
 554                                 /* Previous item that is not separator and it is visible*/
 555                                 for (pos--; pos >= 0; pos--) {
 556                                         item = menu.MenuItems [pos];
 557                                         if (item.Separator == false && item.Visible == true)
 558                                                 break;
 559                                 }
 560
 561                                 if (pos < 0 ) { /* Jump at the end of the menu*/
 562                                         pos = menu.MenuItems.Count - 1;
 563                                         /* Previous item that is not separator and it is visible*/
 564                                         for (; pos >= 0; pos--) {
 565                                                 item = menu.MenuItems [pos];
 566                                                 if (item.Separator == false && item.Visible == true)
 567                                                         break;
 568                                         }
 569                                 }
 570
 571                                 break;
 572
 573                         default:
 574                                 break;
 575                         }
 576
 577                         return menu.MenuItems [pos];
 578                 }
 579
 580                 void ProcessMenuKey (Msg msg_type)
 581                 {
 582                         if (TopMenu.MenuItems.Count == 0)
 583                                 return;
 584
 585                         MainMenu main_menu = TopMenu as MainMenu;
 586
 587                         switch (msg_type) {
 588                         case Msg.WM_SYSKEYDOWN:
 589                                 switch (keynav_state) {
 590                                 case KeyNavState.Idle:
 591                                         keynav_state = KeyNavState.Startup;
 592                                         hotkey_active = true;
 593                                         GrabControl.ActiveTracker = this;
 594                                         CurrentMenu = TopMenu;
 595                                         main_menu.Draw ();
 596                                         break;
 597                                 case KeyNavState.Startup:
 598                                         break;
 599                                 default:
 600                                         Deactivate ();
 601                                         main_menu.Draw ();
 602                                         break;
 603                                 }
 604                                 break;
 605
 606                         case Msg.WM_SYSKEYUP:
 607                                 switch (keynav_state) {
 608                                 case KeyNavState.Idle:
 609                                 case KeyNavState.Navigating:
 610                                         break;
 611                                 case KeyNavState.Startup:
 612                                         keynav_state = KeyNavState.NoPopups;
 613                                         SelectItem (TopMenu, TopMenu.MenuItems [0], false);
 614                                         break;
 615                                 default:
 616                                         Deactivate ();
 617                                         main_menu.Draw ();
 618                                         break;
 619                                 }
 620                                 break;
 621                         }
 622                 }
 623
 624                 bool ProcessMnemonic (Message msg, Keys key_data)
 625                 {
 626                         keynav_state = KeyNavState.Navigating;
 627                         MenuItem item = FindItemByKey (CurrentMenu, msg.WParam);
 628                         if ((item == null) || (GrabControl == null))
 629                                 return false;
 630
 631                         active = true;
 632                         GrabControl.ActiveTracker = this;
 633
 634                         SelectItem (CurrentMenu, item, true);
 635                         if (item.IsPopup) {
 636                                 CurrentMenu = item;
 637                                 SelectItem (item, item.MenuItems [0], false);
 638                         }
 639                         return true;
 640                 }
 641
 642                 Hashtable shortcuts = new Hashtable ();
 643
 644                 public void AddShortcuts (MenuItem item)
 645                 {
 646                         foreach (MenuItem child in item.MenuItems) {
 647                                 AddShortcuts (child);
 648                                 if (child.Shortcut != Shortcut.None)
 649                                         shortcuts [(int)child.Shortcut] = child;
 650                         }
 651
 652                         if (item.Shortcut != Shortcut.None)
 653                                 shortcuts [(int)item.Shortcut] = item;
 654                 }
 655
 656                 public void RemoveShortcuts (MenuItem item)
 657                 {
 658                         foreach (MenuItem child in item.MenuItems) {
 659                                 RemoveShortcuts (child);
 660                                 if (child.Shortcut != Shortcut.None)
 661                                         shortcuts.Remove ((int)child.Shortcut);
 662                         }
 663
 664                         if (item.Shortcut != Shortcut.None)
 665                                 shortcuts.Remove ((int)item.Shortcut);
 666                 }
 667
 668                 bool ProcessShortcut (Keys keyData)
 669                 {
 670                         MenuItem item = shortcuts [(int)keyData] as MenuItem;
 671                         if (item == null || !item.Enabled)
 672                                 return false;
 673
 674                         if (active)
 675                                 Deactivate ();
 676                         item.PerformClick ();
 677                         return true;
 678                 }
 679
 680                 public bool ProcessKeys (ref Message msg, Keys keyData)
 681                 {
 682                         // We should process Alt+key only if we don't have an active menu,
 683                         // and hide it otherwise.
 684                         if ((keyData & Keys.Alt) == Keys.Alt && active) {
 685                                 Deactivate ();
 686                                 return false;
 687                         }
 688
 689                         // If we get Alt-F4, Windows will ignore it because we have a capture,
 690                         // release the capture and the program will exit.  (X11 doesn't care.)
 691                         if ((keyData & Keys.Alt) == Keys.Alt && (keyData & Keys.F4) == Keys.F4) {
 692                                 if (GrabControl != null)
 693                                         GrabControl.ActiveTracker = null;
 694
 695                                 return false;
 696                         }
 697
 698                         if ((Msg)msg.Msg != Msg.WM_SYSKEYUP && ProcessShortcut (keyData))
 699                                 return true;
 700                         else if ((keyData & Keys.KeyCode) == Keys.Menu && TopMenu is MainMenu) {
 701                                 ProcessMenuKey ((Msg) msg.Msg);
 702                                 return true;
 703                         } else if ((keyData & Keys.Alt) == Keys.Alt)
 704                                 return ProcessMnemonic (msg, keyData);
 705                         else if ((Msg)msg.Msg == Msg.WM_SYSKEYUP)
 706                                 return false;
 707                         else if (!Navigating)
 708                                 return false;
 709
 710                         MenuItem item;
 711
 712                         switch (keyData) {
 713                         case Keys.Up:
 714                                 if (CurrentMenu is MainMenu)
 715                                         return true;
 716                                 else if (CurrentMenu.MenuItems.Count == 1 && CurrentMenu.parent_menu == TopMenu) {
 717                                         DeselectItem (CurrentMenu.SelectedItem);
 718                                         CurrentMenu = TopMenu;
 719                                         return true;
 720                                 }
 721                                 item = GetNextItem (CurrentMenu, ItemNavigation.Previous);
 722                                 if (item != null)
 723                                         SelectItem (CurrentMenu, item, false);
 724                                 break;
 725
 726                         case Keys.Down:
 727                                 if (CurrentMenu is MainMenu) {
 728                                         if (CurrentMenu.SelectedItem != null && CurrentMenu.SelectedItem.IsPopup) {
 729                                                 keynav_state = KeyNavState.Navigating;
 730                                                 item = CurrentMenu.SelectedItem;
 731                                                 ShowSubPopup (CurrentMenu, item);
 732                                                 SelectItem (item, item.MenuItems [0], false);
 733                                                 CurrentMenu = item;
 734                                                 active = true;
 735                                                 GrabControl.ActiveTracker = this;
 736                                         }
 737                                         return true;
 738                                 }
 739                                 item = GetNextItem (CurrentMenu, ItemNavigation.Next);
 740                                 if (item != null)
 741                                         SelectItem (CurrentMenu, item, false);
 742                                 break;
 743
 744                         case Keys.Right:
 745                                 if (CurrentMenu is MainMenu) {
 746                                         item = GetNextItem (CurrentMenu, ItemNavigation.Next);
 747                                         bool popup = item.IsPopup && keynav_state != KeyNavState.NoPopups;
 748                                         SelectItem (CurrentMenu, item, popup);
 749                                         if (popup) {
 750                                                 SelectItem (item, item.MenuItems [0], false);
 751                                                 CurrentMenu = item;
 752                                         }
 753                                 } else if (CurrentMenu.SelectedItem != null && CurrentMenu.SelectedItem.IsPopup) {
 754                                         item = CurrentMenu.SelectedItem;
 755                                         ShowSubPopup (CurrentMenu, item);
 756                                         SelectItem (item, item.MenuItems [0], false);
 757                                         CurrentMenu = item;
 758                                 } else {
 759                                         //Search up for a main menu
 760                                         Menu Prnt = CurrentMenu.parent_menu;
 761                                         while (Prnt != null && !(Prnt is MainMenu)) {
 762                                                 Prnt = Prnt.parent_menu;
 763                                         }
 764                                         if (Prnt is MainMenu)
 765                                         {
 766                                                 item = GetNextItem(Prnt, ItemNavigation.Next);
 767                                                 SelectItem(Prnt, item, item.IsPopup);
 768                                                 if (item.IsPopup)
 769                                                 {
 770                                                         SelectItem(item, item.MenuItems[0], false);
 771                                                         CurrentMenu = item;
 772                                                 }
 773                                         }
 774                                 }
 775                                 break;
 776
 777                         case Keys.Left:
 778                                 if (CurrentMenu is MainMenu) {
 779                                         item = GetNextItem (CurrentMenu, ItemNavigation.Previous);
 780                                         bool popup = item.IsPopup && keynav_state != KeyNavState.NoPopups;
 781                                         SelectItem (CurrentMenu, item, popup);
 782                                         if (popup) {
 783                                                 SelectItem (item, item.MenuItems [0], false);
 784                                                 CurrentMenu = item;
 785                                         }
 786                                 } else if (CurrentMenu.parent_menu is MainMenu) {
 787                                         item = GetNextItem (CurrentMenu.parent_menu, ItemNavigation.Previous);
 788                                         SelectItem (CurrentMenu.parent_menu, item, item.IsPopup);
 789                                         if (item.IsPopup) {
 790                                                 SelectItem (item, item.MenuItems [0], false);
 791                                                 CurrentMenu = item;
 792                                         }
 793                                 } else if (!(CurrentMenu is ContextMenu)) { // ContextMenu root remains active.
 794                                         HideSubPopups (CurrentMenu, TopMenu);
 795                                         if (CurrentMenu.parent_menu != null)
 796                                                 CurrentMenu = CurrentMenu.parent_menu;
 797                                 }
 798                                 break;
 799
 800                         case Keys.Return:
 801                                 if (CurrentMenu.SelectedItem != null && CurrentMenu.SelectedItem.IsPopup) {
 802                                         keynav_state = KeyNavState.Navigating;
 803                                         item = CurrentMenu.SelectedItem;
 804                                         ShowSubPopup (CurrentMenu, item);
 805                                         SelectItem (item, item.MenuItems [0], false);
 806                                         CurrentMenu = item;
 807                                         active = true;
 808                                         GrabControl.ActiveTracker = this;
 809                                 } else {
 810                                         ExecFocusedItem (CurrentMenu, CurrentMenu.SelectedItem);
 811                                 }
 812                                 break;
 813
 814                         case Keys.Escape:
 815                                 Deactivate ();
 816                                 break;
 817
 818                         default:
 819                                 ProcessMnemonic (msg, keyData);
 820                                 break;
 821                         }
 822
 823                         return active;
 824                 }
 825         }
 826
 827         internal class PopUpWindow : Control
 828         {
 829                 private Menu menu;
 830                 private Control form;
 831
 832                 public PopUpWindow (Control form, Menu menu): base ()
 833                 {
 834                         this.menu = menu;
 835                         this.form = form;
 836                         SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
 837                         SetStyle (ControlStyles.ResizeRedraw | ControlStyles.Opaque, true);
 838                         is_visible = false;
 839                 }
 840
 841                 protected override CreateParams CreateParams
 842                 {
 843                         get {
 844                                 CreateParams cp = base.CreateParams;
 845                                 cp.Caption = "Menu PopUp";
 846                                 cp.Style = unchecked ((int)(WindowStyles.WS_POPUP));
 847                                 cp.ExStyle |= (int)(WindowExStyles.WS_EX_TOOLWINDOW | WindowExStyles.WS_EX_TOPMOST);
 848                                 return cp;
 849                         }
 850                 }
 851
 852                 public void ShowWindow ()
 853                 {
 854                         XplatUI.SetCursor(form.Handle, Cursors.Default.handle);
 855                         RefreshItems ();
 856                         Show ();
 857                 }
 858
 859                 internal override void OnPaintInternal (PaintEventArgs args)
 860                 {
 861                         ThemeEngine.Current.DrawPopupMenu (args.Graphics, menu, args.ClipRectangle, ClientRectangle);
 862                 }
 863
 864                 public void HideWindow ()
 865                 {
 866                         XplatUI.SetCursor (form.Handle, form.Cursor.handle);
 867                         MenuTracker.HideSubPopups (menu, null);
 868                 Hide ();
 869                 }
 870
 871                 protected override void CreateHandle ()
 872                 {
 873                         base.CreateHandle ();
 874                         RefreshItems ();
 875                 }
 876
 877                 // Called when the number of items has changed
 878                 internal void RefreshItems ()
 879                 {
 880                         Point pt = new Point (Location.X, Location.Y);
 881
 882                         ThemeEngine.Current.CalcPopupMenuSize (DeviceContext, menu);
 883
 884                         if ((pt.X + menu.Rect.Width) > SystemInformation.VirtualScreen.Width) {
 885                                 if (((pt.X - menu.Rect.Width) > 0) && !(menu.parent_menu is MainMenu))
 886                                         pt.X = pt.X - menu.Rect.Width;
 887                                 else
 888                                         pt.X = SystemInformation.VirtualScreen.Width - menu.Rect.Width;
 889
 890                                 if (pt.X < 0)
 891                                         pt.X = 0;
 892                         }
 893                         if ((pt.Y + menu.Rect.Height) > SystemInformation.VirtualScreen.Height) {
 894                                 if ((pt.Y - menu.Rect.Height) > 0)
 895                                         pt.Y = pt.Y - menu.Rect.Height;
 896                                 else
 897                                         pt.Y = SystemInformation.VirtualScreen.Height - menu.Rect.Height;
 898
 899                                 if (pt.Y < 0)
 900                                         pt.Y = 0;
 901                         }
 902
 903                         Location = pt;
 904                         Width = menu.Rect.Width;
 905                         Height = menu.Rect.Height;
 906                 }
 907
 908                 internal override bool ActivateOnShow { get { return false; } }
 909         }
 910 }
 911
 912