include/wx/containr.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/containr.h
   3 // Purpose:     wxControlContainer and wxNavigationEnabled declarations
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     06.08.01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2001, 2011 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_CONTAINR_H_
  13 #define _WX_CONTAINR_H_
  14
  15 #include "wx/defs.h"
  16
  17 #ifndef wxHAS_NATIVE_TAB_TRAVERSAL
  18     // We need wxEVT_XXX declarations in this case.
  19     #include "wx/event.h"
  20 #endif
  21
  22 class WXDLLIMPEXP_FWD_CORE wxWindow;
  23 class WXDLLIMPEXP_FWD_CORE wxWindowBase;
  24
  25 /*
  26     This header declares wxControlContainer class however it's not a real
  27     container of controls but rather just a helper used to implement TAB
  28     navigation among the window children. You should rarely need to use it
  29     directly, derive from the documented public wxNavigationEnabled<> class to
  30     implement TAB navigation in a custom composite window.
  31  */
  32
  33 // ----------------------------------------------------------------------------
  34 // wxControlContainerBase: common part used in both native and generic cases
  35 // ----------------------------------------------------------------------------
  36
  37 class WXDLLIMPEXP_CORE wxControlContainerBase
  38 {
  39 public:
  40     // default ctor, SetContainerWindow() must be called later
  41     wxControlContainerBase()
  42     {
  43         m_winParent = NULL;
  44
  45         // do accept focus initially, we'll stop doing it if/when any children
  46         // are added
  47         m_acceptsFocus = true;
  48         m_inSetFocus = false;
  49         m_winLastFocused = NULL;
  50     }
  51     virtual ~wxControlContainerBase() {}
  52
  53     void SetContainerWindow(wxWindow *winParent)
  54     {
  55         wxASSERT_MSG( !m_winParent, wxT("shouldn't be called twice") );
  56
  57         m_winParent = winParent;
  58     }
  59
  60     // should be called from SetFocus(), returns false if we did nothing with
  61     // the focus and the default processing should take place
  62     bool DoSetFocus();
  63
  64     // should be called when we decide that we should [stop] accepting focus
  65     void SetCanFocus(bool acceptsFocus);
  66
  67     // returns whether we should accept focus ourselves or not
  68     bool AcceptsFocus() const { return m_acceptsFocus; }
  69
  70     // returns whether we or one of our children accepts focus: we always do
  71     // because if we don't have any focusable children it probably means that
  72     // we're not being used as a container at all (think of wxGrid or generic
  73     // wxListCtrl) and so should get focus for ourselves
  74     bool AcceptsFocusRecursively() const { return true; }
  75
  76     // this is used to determine whether we can accept focus when Tab or
  77     // another navigation key is pressed -- we alsways can, for the same reason
  78     // as mentioned above for AcceptsFocusRecursively()
  79     bool AcceptsFocusFromKeyboard() const { return true; }
  80
  81     // Call this when the number of children of the window changes.
  82     // If we have any children, this panel (used just as container for
  83     // them) shouldn't get focus for itself.
  84     void UpdateCanFocus() { SetCanFocus(!HasAnyFocusableChildren()); }
  85
  86 protected:
  87     // set the focus to the child which had it the last time
  88     virtual bool SetFocusToChild();
  89
  90     // return true if we have any children accepting focus
  91     bool HasAnyFocusableChildren() const;
  92
  93     // the parent window we manage the children for
  94     wxWindow *m_winParent;
  95
  96     // the child which had the focus last time this panel was activated
  97     wxWindow *m_winLastFocused;
  98
  99 private:
 100     // value returned by AcceptsFocus(), should be changed using SetCanFocus()
 101     // only
 102     bool m_acceptsFocus;
 103
 104     // a guard against infinite recursion
 105     bool m_inSetFocus;
 106 };
 107
 108 #ifdef wxHAS_NATIVE_TAB_TRAVERSAL
 109
 110 // ----------------------------------------------------------------------------
 111 // wxControlContainer for native TAB navigation
 112 // ----------------------------------------------------------------------------
 113
 114 // this must be a real class as we forward-declare it elsewhere
 115 class WXDLLIMPEXP_CORE wxControlContainer : public wxControlContainerBase
 116 {
 117 protected:
 118     // set the focus to the child which had it the last time
 119     virtual bool SetFocusToChild();
 120 };
 121
 122 #else // !wxHAS_NATIVE_TAB_TRAVERSAL
 123
 124 // ----------------------------------------------------------------------------
 125 // wxControlContainer for TAB navigation implemented in wx itself
 126 // ----------------------------------------------------------------------------
 127
 128 class WXDLLIMPEXP_CORE wxControlContainer : public wxControlContainerBase
 129 {
 130 public:
 131     // default ctor, SetContainerWindow() must be called later
 132     wxControlContainer();
 133
 134     // the methods to be called from the window event handlers
 135     void HandleOnNavigationKey(wxNavigationKeyEvent& event);
 136     void HandleOnFocus(wxFocusEvent& event);
 137     void HandleOnWindowDestroy(wxWindowBase *child);
 138
 139     // called from OnChildFocus() handler, i.e. when one of our (grand)
 140     // children gets the focus
 141     void SetLastFocus(wxWindow *win);
 142
 143 protected:
 144
 145     wxDECLARE_NO_COPY_CLASS(wxControlContainer);
 146 };
 147
 148 #endif // wxHAS_NATIVE_TAB_TRAVERSAL/!wxHAS_NATIVE_TAB_TRAVERSAL
 149
 150 // this function is for wxWidgets internal use only
 151 extern WXDLLIMPEXP_CORE bool wxSetFocusToChild(wxWindow *win, wxWindow **child);
 152
 153 // ----------------------------------------------------------------------------
 154 // wxNavigationEnabled: Derive from this class to support keyboard navigation
 155 // among window children in a wxWindow-derived class. The details of this class
 156 // don't matter, you just need to derive from it to make navigation work.
 157 // ----------------------------------------------------------------------------
 158
 159 // The template parameter W must be a wxWindow-derived class.
 160 template <class W>
 161 class wxNavigationEnabled : public W
 162 {
 163 public:
 164     typedef W BaseWindowClass;
 165
 166     wxNavigationEnabled()
 167     {
 168         m_container.SetContainerWindow(this);
 169
 170 #ifndef wxHAS_NATIVE_TAB_TRAVERSAL
 171         BaseWindowClass::Connect(wxEVT_NAVIGATION_KEY,
 172                 wxNavigationKeyEventHandler(wxNavigationEnabled::OnNavigationKey));
 173
 174         BaseWindowClass::Connect(wxEVT_SET_FOCUS,
 175                 wxFocusEventHandler(wxNavigationEnabled::OnFocus));
 176
 177         BaseWindowClass::Connect(wxEVT_CHILD_FOCUS,
 178                 wxChildFocusEventHandler(wxNavigationEnabled::OnChildFocus));
 179 #endif // !wxHAS_NATIVE_TAB_TRAVERSAL
 180     }
 181
 182     WXDLLIMPEXP_INLINE_CORE virtual bool AcceptsFocus() const
 183     {
 184         return m_container.AcceptsFocus();
 185     }
 186
 187     WXDLLIMPEXP_INLINE_CORE virtual bool AcceptsFocusRecursively() const
 188     {
 189         return m_container.AcceptsFocusRecursively();
 190     }
 191
 192     WXDLLIMPEXP_INLINE_CORE virtual bool AcceptsFocusFromKeyboard() const
 193     {
 194         return m_container.AcceptsFocusFromKeyboard();
 195     }
 196
 197     WXDLLIMPEXP_INLINE_CORE virtual void AddChild(wxWindowBase *child)
 198     {
 199         BaseWindowClass::AddChild(child);
 200
 201         m_container.UpdateCanFocus();
 202     }
 203
 204     WXDLLIMPEXP_INLINE_CORE virtual void RemoveChild(wxWindowBase *child)
 205     {
 206 #ifndef wxHAS_NATIVE_TAB_TRAVERSAL
 207         m_container.HandleOnWindowDestroy(child);
 208 #endif // !wxHAS_NATIVE_TAB_TRAVERSAL
 209
 210         BaseWindowClass::RemoveChild(child);
 211
 212         m_container.UpdateCanFocus();
 213     }
 214
 215     WXDLLIMPEXP_INLINE_CORE virtual void SetFocus()
 216     {
 217         if ( !m_container.DoSetFocus() )
 218             BaseWindowClass::SetFocus();
 219     }
 220
 221     void SetFocusIgnoringChildren()
 222     {
 223         BaseWindowClass::SetFocus();
 224     }
 225
 226     void AcceptFocus(bool acceptFocus)
 227     {
 228         m_container.SetCanFocus(acceptFocus);
 229     }
 230
 231 protected:
 232 #ifndef wxHAS_NATIVE_TAB_TRAVERSAL
 233     void OnNavigationKey(wxNavigationKeyEvent& event)
 234     {
 235         m_container.HandleOnNavigationKey(event);
 236     }
 237
 238     void OnFocus(wxFocusEvent& event)
 239     {
 240         m_container.HandleOnFocus(event);
 241     }
 242
 243     void OnChildFocus(wxChildFocusEvent& event)
 244     {
 245         m_container.SetLastFocus(event.GetWindow());
 246         event.Skip();
 247     }
 248 #endif // !wxHAS_NATIVE_TAB_TRAVERSAL
 249
 250     wxControlContainer m_container;
 251
 252
 253     wxDECLARE_NO_COPY_TEMPLATE_CLASS(wxNavigationEnabled, W);
 254 };
 255
 256 // ----------------------------------------------------------------------------
 257 // Compatibility macros from now on, do NOT use them and preferably do not even
 258 // look at them.
 259 // ----------------------------------------------------------------------------
 260
 261 #if WXWIN_COMPATIBILITY_2_8
 262
 263 // common part of WX_DECLARE_CONTROL_CONTAINER in the native and generic cases,
 264 // it should be used in the wxWindow-derived class declaration
 265 #define WX_DECLARE_CONTROL_CONTAINER_BASE()                                   \
 266 public:                                                                       \
 267     virtual bool AcceptsFocus() const;                                        \
 268     virtual bool AcceptsFocusRecursively() const;                             \
 269     virtual bool AcceptsFocusFromKeyboard() const;                            \
 270     virtual void AddChild(wxWindowBase *child);                               \
 271     virtual void RemoveChild(wxWindowBase *child);                            \
 272     virtual void SetFocus();                                                  \
 273     void SetFocusIgnoringChildren();                                          \
 274     void AcceptFocus(bool acceptFocus)                                        \
 275     {                                                                         \
 276         m_container.SetCanFocus(acceptFocus);                                 \
 277     }                                                                         \
 278                                                                               \
 279 protected:                                                                    \
 280     wxControlContainer m_container
 281
 282 // this macro must be used in the derived class ctor
 283 #define WX_INIT_CONTROL_CONTAINER() \
 284     m_container.SetContainerWindow(this)
 285
 286 // common part of WX_DELEGATE_TO_CONTROL_CONTAINER in the native and generic
 287 // cases, must be used in the wxWindow-derived class implementation
 288 #define WX_DELEGATE_TO_CONTROL_CONTAINER_BASE(classname, basename)            \
 289     void classname::AddChild(wxWindowBase *child)                             \
 290     {                                                                         \
 291         basename::AddChild(child);                                            \
 292                                                                               \
 293         m_container.UpdateCanFocus();                                         \
 294     }                                                                         \
 295                                                                               \
 296     bool classname::AcceptsFocusRecursively() const                           \
 297     {                                                                         \
 298         return m_container.AcceptsFocusRecursively();                         \
 299     }                                                                         \
 300                                                                               \
 301     void classname::SetFocus()                                                \
 302     {                                                                         \
 303         if ( !m_container.DoSetFocus() )                                      \
 304             basename::SetFocus();                                             \
 305     }                                                                         \
 306                                                                               \
 307     bool classname::AcceptsFocus() const                                      \
 308     {                                                                         \
 309         return m_container.AcceptsFocus();                                    \
 310     }                                                                         \
 311                                                                               \
 312     bool classname::AcceptsFocusFromKeyboard() const                          \
 313     {                                                                         \
 314         return m_container.AcceptsFocusFromKeyboard();                        \
 315     }
 316
 317
 318 #ifdef wxHAS_NATIVE_TAB_TRAVERSAL
 319
 320 #define WX_EVENT_TABLE_CONTROL_CONTAINER(classname)
 321
 322 #define WX_DECLARE_CONTROL_CONTAINER WX_DECLARE_CONTROL_CONTAINER_BASE
 323
 324 #define WX_DELEGATE_TO_CONTROL_CONTAINER(classname, basename)                 \
 325     WX_DELEGATE_TO_CONTROL_CONTAINER_BASE(classname, basename)                \
 326                                                                               \
 327     void classname::RemoveChild(wxWindowBase *child)                          \
 328     {                                                                         \
 329         basename::RemoveChild(child);                                         \
 330                                                                               \
 331         m_container.UpdateCanFocus();                                         \
 332     }                                                                         \
 333                                                                               \
 334     void classname::SetFocusIgnoringChildren()                                \
 335     {                                                                         \
 336         basename::SetFocus();                                                 \
 337     }
 338
 339 #else // !wxHAS_NATIVE_TAB_TRAVERSAL
 340
 341 // declare the methods to be forwarded
 342 #define WX_DECLARE_CONTROL_CONTAINER()                                        \
 343     WX_DECLARE_CONTROL_CONTAINER_BASE();                                      \
 344                                                                               \
 345 public:                                                                       \
 346     void OnNavigationKey(wxNavigationKeyEvent& event);                        \
 347     void OnFocus(wxFocusEvent& event);                                        \
 348     virtual void OnChildFocus(wxChildFocusEvent& event)
 349
 350 // implement the event table entries for wxControlContainer
 351 #define WX_EVENT_TABLE_CONTROL_CONTAINER(classname) \
 352     EVT_SET_FOCUS(classname::OnFocus) \
 353     EVT_CHILD_FOCUS(classname::OnChildFocus) \
 354     EVT_NAVIGATION_KEY(classname::OnNavigationKey)
 355
 356 // implement the methods forwarding to the wxControlContainer
 357 #define WX_DELEGATE_TO_CONTROL_CONTAINER(classname, basename)                 \
 358     WX_DELEGATE_TO_CONTROL_CONTAINER_BASE(classname, basename)                \
 359                                                                               \
 360     void classname::RemoveChild(wxWindowBase *child)                          \
 361     {                                                                         \
 362         m_container.HandleOnWindowDestroy(child);                             \
 363                                                                               \
 364         basename::RemoveChild(child);                                         \
 365                                                                               \
 366         m_container.UpdateCanFocus();                                         \
 367     }                                                                         \
 368                                                                               \
 369     void classname::OnNavigationKey( wxNavigationKeyEvent& event )            \
 370     {                                                                         \
 371         m_container.HandleOnNavigationKey(event);                             \
 372     }                                                                         \
 373                                                                               \
 374     void classname::SetFocusIgnoringChildren()                                \
 375     {                                                                         \
 376         basename::SetFocus();                                                 \
 377     }                                                                         \
 378                                                                               \
 379     void classname::OnChildFocus(wxChildFocusEvent& event)                    \
 380     {                                                                         \
 381         m_container.SetLastFocus(event.GetWindow());                          \
 382         event.Skip();                                                         \
 383     }                                                                         \
 384                                                                               \
 385     void classname::OnFocus(wxFocusEvent& event)                              \
 386     {                                                                         \
 387         m_container.HandleOnFocus(event);                                     \
 388     }
 389
 390 #endif // wxHAS_NATIVE_TAB_TRAVERSAL/!wxHAS_NATIVE_TAB_TRAVERSAL
 391
 392 #endif // WXWIN_COMPATIBILITY_2_8
 393
 394 #endif // _WX_CONTAINR_H_