src/common/containr.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/containr.cpp
   3 // Purpose:     implementation of wxControlContainer
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     06.08.01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // License:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/containr.h"
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/log.h"
  33     #include "wx/event.h"
  34     #include "wx/window.h"
  35     #include "wx/scrolbar.h"
  36     #include "wx/radiobut.h"
  37 #endif //WX_PRECOMP
  38
  39 // trace mask for focus messages
  40 #define TRACE_FOCUS _T("focus")
  41
  42 // ============================================================================
  43 // implementation
  44 // ============================================================================
  45
  46 // ----------------------------------------------------------------------------
  47 // wxControlContainerBase
  48 // ----------------------------------------------------------------------------
  49
  50 void wxControlContainerBase::SetCanFocus(bool acceptsFocus)
  51 {
  52     if ( acceptsFocus == m_acceptsFocus )
  53         return;
  54
  55     m_acceptsFocus = acceptsFocus;
  56
  57     m_winParent->SetCanFocus(m_acceptsFocus);
  58 }
  59
  60 bool wxControlContainerBase::HasAnyFocusableChildren() const
  61 {
  62     const wxWindowList& children = m_winParent->GetChildren();
  63     for ( wxWindowList::const_iterator i = children.begin(),
  64                                      end = children.end();
  65           i != end;
  66           ++i )
  67     {
  68         const wxWindow * const child = *i;
  69
  70         if ( !m_winParent->IsClientAreaChild(child) )
  71             continue;
  72
  73         if ( child->CanAcceptFocus() )
  74             return true;
  75     }
  76
  77     return false;
  78 }
  79
  80 bool wxControlContainerBase::DoSetFocus()
  81 {
  82     wxLogTrace(TRACE_FOCUS, _T("SetFocus on wxPanel 0x%p."),
  83                m_winParent->GetHandle());
  84
  85     if (m_inSetFocus)
  86         return true;
  87
  88     // when the panel gets the focus we move the focus to either the last
  89     // window that had the focus or the first one that can get it unless the
  90     // focus had been already set to some other child
  91
  92     wxWindow *win = wxWindow::FindFocus();
  93     while ( win )
  94     {
  95         if ( win == m_winParent )
  96         {
  97             // our child already has focus, don't take it away from it
  98             return true;
  99         }
 100
 101         if ( win->IsTopLevel() )
 102         {
 103             // don't look beyond the first top level parent - useless and
 104             // unnecessary
 105             break;
 106         }
 107
 108         win = win->GetParent();
 109     }
 110
 111     // protect against infinite recursion:
 112     m_inSetFocus = true;
 113
 114     bool ret = SetFocusToChild();
 115
 116     m_inSetFocus = false;
 117
 118     return ret;
 119 }
 120
 121 bool wxControlContainerBase::SetFocusToChild()
 122 {
 123     return wxSetFocusToChild(m_winParent, &m_winLastFocused);
 124 }
 125
 126 #ifndef wxHAS_NATIVE_TAB_TRAVERSAL
 127
 128 // ----------------------------------------------------------------------------
 129 // generic wxControlContainer
 130 // ----------------------------------------------------------------------------
 131
 132 wxControlContainer::wxControlContainer()
 133 {
 134     m_winLastFocused = NULL;
 135 }
 136
 137 void wxControlContainer::SetLastFocus(wxWindow *win)
 138 {
 139     // the panel itself should never get the focus at all but if it does happen
 140     // temporarily (as it seems to do under wxGTK), at the very least don't
 141     // forget our previous m_winLastFocused
 142     if ( win != m_winParent )
 143     {
 144         // if we're setting the focus
 145         if ( win )
 146         {
 147             // find the last _immediate_ child which got focus
 148             wxWindow *winParent = win;
 149             while ( winParent != m_winParent )
 150             {
 151                 win = winParent;
 152                 winParent = win->GetParent();
 153
 154                 // Yes, this can happen, though in a totally pathological case.
 155                 // like when detaching a menubar from a frame with a child
 156                 // which has pushed itself as an event handler for the menubar.
 157                 // (under wxGTK)
 158
 159                 wxASSERT_MSG( winParent,
 160                               _T("Setting last focus for a window that is not our child?") );
 161             }
 162         }
 163
 164         m_winLastFocused = win;
 165
 166         if ( win )
 167         {
 168             wxLogTrace(TRACE_FOCUS, _T("Set last focus to %s(%s)"),
 169                        win->GetClassInfo()->GetClassName(),
 170                        win->GetLabel().c_str());
 171         }
 172         else
 173         {
 174             wxLogTrace(TRACE_FOCUS, _T("No more last focus"));
 175         }
 176     }
 177
 178     // propagate the last focus upwards so that our parent can set focus back
 179     // to us if it loses it now and regains later; do *not* do this if we are
 180     // a toplevel window (e.g. wxDialog) that has another frame as its parent
 181     if ( !m_winParent->IsTopLevel() )
 182     {
 183         wxWindow *parent = m_winParent->GetParent();
 184         if ( parent )
 185         {
 186             wxChildFocusEvent eventFocus(m_winParent);
 187             parent->GetEventHandler()->ProcessEvent(eventFocus);
 188         }
 189     }
 190 }
 191
 192 // --------------------------------------------------------------------
 193 // The following four functions are used to find other radio buttons
 194 // within the same group. Used by wxSetFocusToChild on wxMSW
 195 // --------------------------------------------------------------------
 196
 197 #if defined(__WXMSW__) && wxUSE_RADIOBTN
 198
 199 wxRadioButton* wxGetPreviousButtonInGroup(wxRadioButton *btn)
 200 {
 201     if ( btn->HasFlag(wxRB_GROUP) || btn->HasFlag(wxRB_SINGLE) )
 202         return NULL;
 203
 204     const wxWindowList& siblings = btn->GetParent()->GetChildren();
 205     wxWindowList::compatibility_iterator nodeThis = siblings.Find(btn);
 206     wxCHECK_MSG( nodeThis, NULL, _T("radio button not a child of its parent?") );
 207
 208     // Iterate over all previous siblings until we find the next radio button
 209     wxWindowList::compatibility_iterator nodeBefore = nodeThis->GetPrevious();
 210     wxRadioButton *prevBtn = 0;
 211     while (nodeBefore)
 212     {
 213         prevBtn = wxDynamicCast(nodeBefore->GetData(), wxRadioButton);
 214         if (prevBtn)
 215             break;
 216
 217         nodeBefore = nodeBefore->GetPrevious();
 218     }
 219
 220     if (!prevBtn || prevBtn->HasFlag(wxRB_SINGLE))
 221     {
 222         // no more buttons in group
 223         return NULL;
 224     }
 225
 226     return prevBtn;
 227 }
 228
 229 wxRadioButton* wxGetNextButtonInGroup(wxRadioButton *btn)
 230 {
 231     if (btn->HasFlag(wxRB_SINGLE))
 232         return NULL;
 233
 234     const wxWindowList& siblings = btn->GetParent()->GetChildren();
 235     wxWindowList::compatibility_iterator nodeThis = siblings.Find(btn);
 236     wxCHECK_MSG( nodeThis, NULL, _T("radio button not a child of its parent?") );
 237
 238     // Iterate over all previous siblings until we find the next radio button
 239     wxWindowList::compatibility_iterator nodeNext = nodeThis->GetNext();
 240     wxRadioButton *nextBtn = 0;
 241     while (nodeNext)
 242     {
 243         nextBtn = wxDynamicCast(nodeNext->GetData(), wxRadioButton);
 244         if (nextBtn)
 245             break;
 246
 247         nodeNext = nodeNext->GetNext();
 248     }
 249
 250     if ( !nextBtn || nextBtn->HasFlag(wxRB_GROUP) || nextBtn->HasFlag(wxRB_SINGLE) )
 251     {
 252         // no more buttons or the first button of the next group
 253         return NULL;
 254     }
 255
 256     return nextBtn;
 257 }
 258
 259 wxRadioButton* wxGetFirstButtonInGroup(wxRadioButton *btn)
 260 {
 261     while (true)
 262     {
 263         wxRadioButton* prevBtn = wxGetPreviousButtonInGroup(btn);
 264         if (!prevBtn)
 265             return btn;
 266
 267         btn = prevBtn;
 268     }
 269 }
 270
 271 wxRadioButton* wxGetLastButtonInGroup(wxRadioButton *btn)
 272 {
 273     while (true)
 274     {
 275         wxRadioButton* nextBtn = wxGetNextButtonInGroup(btn);
 276         if (!nextBtn)
 277             return btn;
 278
 279         btn = nextBtn;
 280     }
 281 }
 282
 283 wxRadioButton* wxGetSelectedButtonInGroup(wxRadioButton *btn)
 284 {
 285     // Find currently selected button
 286     if (btn->GetValue())
 287         return btn;
 288
 289     if (btn->HasFlag(wxRB_SINGLE))
 290         return NULL;
 291
 292     wxRadioButton *selBtn;
 293
 294     // First check all previous buttons
 295     for (selBtn = wxGetPreviousButtonInGroup(btn); selBtn; selBtn = wxGetPreviousButtonInGroup(selBtn))
 296         if (selBtn->GetValue())
 297             return selBtn;
 298
 299     // Now all following buttons
 300     for (selBtn = wxGetNextButtonInGroup(btn); selBtn; selBtn = wxGetNextButtonInGroup(selBtn))
 301         if (selBtn->GetValue())
 302             return selBtn;
 303
 304     return NULL;
 305 }
 306
 307 #endif // __WXMSW__
 308
 309 // ----------------------------------------------------------------------------
 310 // Keyboard handling - this is the place where the TAB traversal logic is
 311 // implemented. As this code is common to all ports, this ensures consistent
 312 // behaviour even if we don't specify how exactly the wxNavigationKeyEvent are
 313 // generated and this is done in platform specific code which also ensures that
 314 // we can follow the given platform standards.
 315 // ----------------------------------------------------------------------------
 316
 317 void wxControlContainer::HandleOnNavigationKey( wxNavigationKeyEvent& event )
 318 {
 319     // for a TLW we shouldn't involve the parent window, it has nothing to do
 320     // with keyboard navigation inside this TLW
 321     wxWindow *parent = m_winParent->IsTopLevel() ? NULL
 322                                                  : m_winParent->GetParent();
 323
 324     // the event is propagated downwards if the event emitter was our parent
 325     bool goingDown = event.GetEventObject() == parent;
 326
 327     const wxWindowList& children = m_winParent->GetChildren();
 328
 329     // if we have exactly one notebook-like child window (actually it could be
 330     // any window that returns true from its HasMultiplePages()), then
 331     // [Shift-]Ctrl-Tab and Ctrl-PageUp/Down keys should iterate over its pages
 332     // even if the focus is outside of the control because this is how the
 333     // standard MSW properties dialogs behave and we do it under other platforms
 334     // as well because it seems like a good idea -- but we can always put this
 335     // block inside "#ifdef __WXMSW__" if it's not suitable there
 336     if ( event.IsWindowChange() && !goingDown )
 337     {
 338         // check if we have a unique notebook-like child
 339         wxWindow *bookctrl = NULL;
 340         for ( wxWindowList::const_iterator i = children.begin(),
 341                                          end = children.end();
 342               i != end;
 343               ++i )
 344         {
 345             wxWindow * const window = *i;
 346             if ( window->HasMultiplePages() )
 347             {
 348                 if ( bookctrl )
 349                 {
 350                     // this is the second book-like control already so don't do
 351                     // anything as we don't know which one should have its page
 352                     // changed
 353                     bookctrl = NULL;
 354                     break;
 355                 }
 356
 357                 bookctrl = window;
 358             }
 359         }
 360
 361         if ( bookctrl )
 362         {
 363             // make sure that we don't bubble up the event again from the book
 364             // control resulting in infinite recursion
 365             wxNavigationKeyEvent eventCopy(event);
 366             eventCopy.SetEventObject(m_winParent);
 367             if ( bookctrl->GetEventHandler()->ProcessEvent(eventCopy) )
 368                 return;
 369         }
 370     }
 371
 372     // there is not much to do if we don't have children and we're not
 373     // interested in "notebook page change" events here
 374     if ( !children.GetCount() || event.IsWindowChange() )
 375     {
 376         // let the parent process it unless it already comes from our parent
 377         // of we don't have any
 378         if ( goingDown ||
 379              !parent || !parent->GetEventHandler()->ProcessEvent(event) )
 380         {
 381             event.Skip();
 382         }
 383
 384         return;
 385     }
 386
 387     // where are we going?
 388     const bool forward = event.GetDirection();
 389
 390     // the node of the children list from which we should start looking for the
 391     // next acceptable child
 392     wxWindowList::compatibility_iterator node, start_node;
 393
 394     // we should start from the first/last control and not from the one which
 395     // had focus the last time if we're propagating the event downwards because
 396     // for our parent we look like a single control
 397     if ( goingDown )
 398     {
 399         // just to be sure it's not used (normally this is not necessary, but
 400         // doesn't hurt neither)
 401         m_winLastFocused = NULL;
 402
 403         // start from first or last depending on where we're going
 404         node = forward ? children.GetFirst() : children.GetLast();
 405     }
 406     else // going up
 407     {
 408         // try to find the child which has the focus currently
 409
 410         // the event emitter might have done this for us
 411         wxWindow *winFocus = event.GetCurrentFocus();
 412
 413         // but if not, we might know where the focus was ourselves
 414         if (!winFocus)
 415             winFocus = m_winLastFocused;
 416
 417         // if still no luck, do it the hard way
 418         if (!winFocus)
 419             winFocus = wxWindow::FindFocus();
 420
 421         if ( winFocus )
 422         {
 423 #if defined(__WXMSW__) && wxUSE_RADIOBTN
 424             // If we are in a radio button group, start from the first item in the
 425             // group
 426             if ( event.IsFromTab() && wxIsKindOf(winFocus, wxRadioButton ) )
 427                 winFocus = wxGetFirstButtonInGroup((wxRadioButton*)winFocus);
 428 #endif // __WXMSW__
 429             // ok, we found the focus - now is it our child?
 430             start_node = children.Find( winFocus );
 431         }
 432
 433         if ( !start_node && m_winLastFocused )
 434         {
 435             // window which has focus isn't our child, fall back to the one
 436             // which had the focus the last time
 437             start_node = children.Find( m_winLastFocused );
 438         }
 439
 440         // if we still didn't find anything, we should start with the first one
 441         if ( !start_node )
 442         {
 443             start_node = children.GetFirst();
 444         }
 445
 446         // and the first child which we can try setting focus to is the next or
 447         // the previous one
 448         node = forward ? start_node->GetNext() : start_node->GetPrevious();
 449     }
 450
 451     // we want to cycle over all elements passing by NULL
 452     for ( ;; )
 453     {
 454         // don't go into infinite loop
 455         if ( start_node && node && node == start_node )
 456             break;
 457
 458         // Have we come to the last or first item on the panel?
 459         if ( !node )
 460         {
 461             if ( !start_node )
 462             {
 463                 // exit now as otherwise we'd loop forever
 464                 break;
 465             }
 466
 467             if ( !goingDown )
 468             {
 469                 // Check if our (maybe grand) parent is another panel: if this
 470                 // is the case, they will know what to do with this navigation
 471                 // key and so give them the chance to process it instead of
 472                 // looping inside this panel (normally, the focus will go to
 473                 // the next/previous item after this panel in the parent
 474                 // panel).
 475                 wxWindow *focussed_child_of_parent = m_winParent;
 476                 while ( parent )
 477                 {
 478                     // we don't want to tab into a different dialog or frame
 479                     if ( focussed_child_of_parent->IsTopLevel() )
 480                         break;
 481
 482                     event.SetCurrentFocus( focussed_child_of_parent );
 483                     if ( parent->GetEventHandler()->ProcessEvent( event ) )
 484                         return;
 485
 486                     focussed_child_of_parent = parent;
 487
 488                     parent = parent->GetParent();
 489                 }
 490             }
 491             //else: as the focus came from our parent, we definitely don't want
 492             //      to send it back to it!
 493
 494             // no, we are not inside another panel so process this ourself
 495             node = forward ? children.GetFirst() : children.GetLast();
 496
 497             continue;
 498         }
 499
 500         wxWindow *child = node->GetData();
 501
 502         // don't TAB to another TLW
 503         if ( child->IsTopLevel() )
 504         {
 505             node = forward ? node->GetNext() : node->GetPrevious();
 506
 507             continue;
 508         }
 509
 510 #if defined(__WXMSW__) && wxUSE_RADIOBTN
 511         if ( event.IsFromTab() )
 512         {
 513             if ( wxIsKindOf(child, wxRadioButton) )
 514             {
 515                 // only radio buttons with either wxRB_GROUP or wxRB_SINGLE
 516                 // can be tabbed to
 517                 if ( child->HasFlag(wxRB_GROUP) )
 518                 {
 519                     // need to tab into the active button within a group
 520                     wxRadioButton *rb = wxGetSelectedButtonInGroup((wxRadioButton*)child);
 521                     if ( rb )
 522                         child = rb;
 523                 }
 524                 else if ( !child->HasFlag(wxRB_SINGLE) )
 525                 {
 526                     node = forward ? node->GetNext() : node->GetPrevious();
 527                     continue;
 528                 }
 529             }
 530         }
 531         else if ( m_winLastFocused &&
 532                   wxIsKindOf(m_winLastFocused, wxRadioButton) &&
 533                   !m_winLastFocused->HasFlag(wxRB_SINGLE) )
 534         {
 535             wxRadioButton * const
 536                 lastBtn = static_cast<wxRadioButton *>(m_winLastFocused);
 537
 538             // cursor keys don't navigate out of a radio button group so
 539             // find the correct radio button to focus
 540             if ( forward )
 541             {
 542                 child = wxGetNextButtonInGroup(lastBtn);
 543                 if ( !child )
 544                 {
 545                     // no next button in group, set it to the first button
 546                     child = wxGetFirstButtonInGroup(lastBtn);
 547                 }
 548             }
 549             else
 550             {
 551                 child = wxGetPreviousButtonInGroup(lastBtn);
 552                 if ( !child )
 553                 {
 554                     // no previous button in group, set it to the last button
 555                     child = wxGetLastButtonInGroup(lastBtn);
 556                 }
 557             }
 558
 559             if ( child == m_winLastFocused )
 560             {
 561                 // must be a group consisting of only one button therefore
 562                 // no need to send a navigation event
 563                 event.Skip(false);
 564                 return;
 565             }
 566         }
 567 #endif // __WXMSW__
 568
 569         if ( child->CanAcceptFocusFromKeyboard() )
 570         {
 571             // if we're setting the focus to a child panel we should prevent it
 572             // from giving it to the child which had the focus the last time
 573             // and instead give it to the first/last child depending from which
 574             // direction we're coming
 575             event.SetEventObject(m_winParent);
 576
 577             // disable propagation for this call as otherwise the event might
 578             // bounce back to us.
 579             wxPropagationDisabler disableProp(event);
 580             if ( !child->GetEventHandler()->ProcessEvent(event) )
 581             {
 582                 // set it first in case SetFocusFromKbd() results in focus
 583                 // change too
 584                 m_winLastFocused = child;
 585
 586                 // everything is simple: just give focus to it
 587                 child->SetFocusFromKbd();
 588             }
 589             //else: the child manages its focus itself
 590
 591             event.Skip( false );
 592
 593             return;
 594         }
 595
 596         node = forward ? node->GetNext() : node->GetPrevious();
 597     }
 598
 599     // we cycled through all of our children and none of them wanted to accept
 600     // focus
 601     event.Skip();
 602 }
 603
 604 void wxControlContainer::HandleOnWindowDestroy(wxWindowBase *child)
 605 {
 606     if ( child == m_winLastFocused )
 607         m_winLastFocused = NULL;
 608 }
 609
 610 // ----------------------------------------------------------------------------
 611 // focus handling
 612 // ----------------------------------------------------------------------------
 613
 614 void wxControlContainer::HandleOnFocus(wxFocusEvent& event)
 615 {
 616     wxLogTrace(TRACE_FOCUS, _T("OnFocus on wxPanel 0x%p, name: %s"),
 617                m_winParent->GetHandle(),
 618                m_winParent->GetName().c_str() );
 619
 620     DoSetFocus();
 621
 622     event.Skip();
 623 }
 624
 625
 626 #else
 627   // wxHAS_NATIVE_TAB_TRAVERSAL
 628
 629 bool wxControlContainer::SetFocusToChild()
 630 {
 631     return wxSetFocusToChild(m_winParent, NULL);
 632 }
 633
 634
 635 #endif // !wxHAS_NATIVE_TAB_TRAVERSAL
 636
 637 // ----------------------------------------------------------------------------
 638 // SetFocusToChild(): this function is used by wxPanel but also by wxFrame in
 639 // wxMSW, this is why it is outside of wxControlContainer class
 640 // ----------------------------------------------------------------------------
 641
 642 bool wxSetFocusToChild(wxWindow *win, wxWindow **childLastFocused)
 643 {
 644     wxCHECK_MSG( win, false, _T("wxSetFocusToChild(): invalid window") );
 645     //    wxCHECK_MSG( childLastFocused, false,
 646     //             _T("wxSetFocusToChild(): NULL child poonter") );
 647
 648     if ( childLastFocused && *childLastFocused )
 649     {
 650         // It might happen that the window got reparented
 651         if ( (*childLastFocused)->GetParent() == win )
 652         {
 653             wxLogTrace(TRACE_FOCUS,
 654                        _T("SetFocusToChild() => last child (0x%p)."),
 655                        (*childLastFocused)->GetHandle());
 656
 657             // not SetFocusFromKbd(): we're restoring focus back to the old
 658             // window and not setting it as the result of a kbd action
 659             (*childLastFocused)->SetFocus();
 660             return true;
 661         }
 662         else
 663         {
 664             // it doesn't count as such any more
 665             *childLastFocused = NULL;
 666         }
 667     }
 668
 669     // set the focus to the first child who wants it
 670     wxWindowList::compatibility_iterator node = win->GetChildren().GetFirst();
 671     while ( node )
 672     {
 673         wxWindow *child = node->GetData();
 674         node = node->GetNext();
 675
 676         // skip special windows:
 677         if ( !win->IsClientAreaChild(child) )
 678             continue;
 679
 680         if ( child->CanAcceptFocusFromKeyboard() && !child->IsTopLevel() )
 681         {
 682 #if defined(__WXMSW__) && wxUSE_RADIOBTN
 683             // If a radiobutton is the first focusable child, search for the
 684             // selected radiobutton in the same group
 685             wxRadioButton* btn = wxDynamicCast(child, wxRadioButton);
 686             if (btn)
 687             {
 688                 wxRadioButton* selected = wxGetSelectedButtonInGroup(btn);
 689                 if (selected)
 690                     child = selected;
 691             }
 692 #endif // __WXMSW__
 693
 694             wxLogTrace(TRACE_FOCUS,
 695                        _T("SetFocusToChild() => first child (0x%p)."),
 696                        child->GetHandle());
 697
 698             if (childLastFocused)
 699                 *childLastFocused = child;
 700             child->SetFocusFromKbd();
 701             return true;
 702         }
 703     }
 704
 705     return false;
 706 }
 707