include/wx/renderer.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/renderer.h
   3 // Purpose:     wxRendererNative class declaration
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     20.07.2003
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 /*
  13    Renderers are used in wxWidgets for two similar but different things:
  14     (a) wxUniversal uses them to draw everything, i.e. all the control
  15     (b) all the native ports use them to draw generic controls only
  16
  17    wxUniversal needs more functionality than what is included in the base class
  18    as it needs to draw stuff like scrollbars which are never going to be
  19    generic. So we put the bare minimum needed by the native ports here and the
  20    full wxRenderer class is declared in wx/univ/renderer.h and is only used by
  21    wxUniveral (although note that native ports can load wxRenderer objects from
  22    theme DLLs and use them as wxRendererNative ones, of course).
  23  */
  24
  25 #ifndef _WX_RENDERER_H_
  26 #define _WX_RENDERER_H_
  27
  28 class WXDLLEXPORT wxDC;
  29 class WXDLLEXPORT wxWindow;
  30
  31 #include "wx/gdicmn.h" // for wxPoint
  32
  33 // some platforms have their own renderers, others use the generic one
  34 #if (defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXGTK__)) && !defined(__PALMOS__)
  35     #define wxHAS_NATIVE_RENDERER
  36 #else
  37     #undef wxHAS_NATIVE_RENDERER
  38 #endif
  39
  40 // ----------------------------------------------------------------------------
  41 // constants
  42 // ----------------------------------------------------------------------------
  43
  44 // control state flags used in wxRenderer and wxColourScheme
  45 enum
  46 {
  47     wxCONTROL_DISABLED   = 0x00000001,  // control is disabled
  48     wxCONTROL_FOCUSED    = 0x00000002,  // currently has keyboard focus
  49     wxCONTROL_PRESSED    = 0x00000004,  // (button) is pressed
  50     wxCONTROL_ISDEFAULT  = 0x00000008,  // only applies to the buttons
  51     wxCONTROL_ISSUBMENU  = wxCONTROL_ISDEFAULT, // only for menu items
  52     wxCONTROL_EXPANDED   = wxCONTROL_ISDEFAULT, // only for the tree items
  53     wxCONTROL_CURRENT    = 0x00000010,  // mouse is currently over the control
  54     wxCONTROL_SELECTED   = 0x00000020,  // selected item in e.g. listbox
  55     wxCONTROL_CHECKED    = 0x00000040,  // (check/radio button) is checked
  56     wxCONTROL_CHECKABLE  = 0x00000080,  // (menu) item can be checked
  57
  58     wxCONTROL_FLAGS_MASK = 0x000000ff,
  59
  60     // this is a pseudo flag not used directly by wxRenderer but rather by some
  61     // controls internally
  62     wxCONTROL_DIRTY      = 0x80000000
  63 };
  64
  65 // ----------------------------------------------------------------------------
  66 // helper structs
  67 // ----------------------------------------------------------------------------
  68
  69 // wxSplitterWindow parameters
  70 struct WXDLLEXPORT wxSplitterRenderParams
  71 {
  72     // the only way to initialize this struct is by using this ctor
  73     wxSplitterRenderParams(wxCoord widthSash_, wxCoord border_, bool isSens_)
  74         : widthSash(widthSash_), border(border_), isHotSensitive(isSens_)
  75         {
  76         }
  77
  78     // the width of the splitter sash
  79     const wxCoord widthSash;
  80
  81     // the width of the border of the splitter window
  82     const wxCoord border;
  83
  84     // true if the splitter changes its appearance when the mouse is over it
  85     const bool isHotSensitive;
  86 };
  87
  88 // wxRendererNative interface version
  89 struct WXDLLEXPORT wxRendererVersion
  90 {
  91     wxRendererVersion(int version_, int age_) : version(version_), age(age_) { }
  92
  93     // default copy ctor, assignment operator and dtor are ok
  94
  95     // the current version and age of wxRendererNative interface: different
  96     // versions are incompatible (in both ways) while the ages inside the same
  97     // version are upwards compatible, i.e. the version of the renderer must
  98     // match the version of the main program exactly while the age may be
  99     // highergreater or equal to it
 100     //
 101     // NB: don't forget to increment age after adding any new virtual function!
 102     enum
 103     {
 104         Current_Version = 1,
 105         Current_Age = 5
 106     };
 107
 108
 109     // check if the given version is compatible with the current one
 110     static bool IsCompatible(const wxRendererVersion& ver)
 111     {
 112         return ver.version == Current_Version && ver.age >= Current_Age;
 113     }
 114
 115     const int version;
 116     const int age;
 117 };
 118
 119 // ----------------------------------------------------------------------------
 120 // wxRendererNative: abstracts drawing methods needed by the native controls
 121 // ----------------------------------------------------------------------------
 122
 123 class WXDLLEXPORT wxRendererNative
 124 {
 125 public:
 126     // drawing functions
 127     // -----------------
 128
 129     // draw the header control button (used by wxListCtrl)
 130     virtual void DrawHeaderButton(wxWindow *win,
 131                                   wxDC& dc,
 132                                   const wxRect& rect,
 133                                   int flags = 0) = 0;
 134
 135     // draw the expanded/collapsed icon for a tree control item
 136     virtual void DrawTreeItemButton(wxWindow *win,
 137                                     wxDC& dc,
 138                                     const wxRect& rect,
 139                                     int flags = 0) = 0;
 140
 141     // draw the border for sash window: this border must be such that the sash
 142     // drawn by DrawSash() blends into it well
 143     virtual void DrawSplitterBorder(wxWindow *win,
 144                                     wxDC& dc,
 145                                     const wxRect& rect,
 146                                     int flags = 0) = 0;
 147
 148     // draw a (vertical) sash
 149     virtual void DrawSplitterSash(wxWindow *win,
 150                                   wxDC& dc,
 151                                   const wxSize& size,
 152                                   wxCoord position,
 153                                   wxOrientation orient,
 154                                   int flags = 0) = 0;
 155
 156
 157     // geometry functions
 158     // ------------------
 159
 160     // get the splitter parameters: the x field of the returned point is the
 161     // sash width and the y field is the border width
 162     virtual wxSplitterRenderParams GetSplitterParams(const wxWindow *win) = 0;
 163
 164
 165     // pseudo constructors
 166     // -------------------
 167
 168     // return the currently used renderer
 169     static wxRendererNative& Get();
 170
 171     // return the generic implementation of the renderer
 172     static wxRendererNative& GetGeneric();
 173
 174     // return the default (native) implementation for this platform
 175     static wxRendererNative& GetDefault();
 176
 177
 178     // changing the global renderer
 179     // ----------------------------
 180
 181 #if wxUSE_DYNLIB_CLASS
 182     // load the renderer from the specified DLL, the returned pointer must be
 183     // deleted by caller if not NULL when it is not used any more
 184     static wxRendererNative *Load(const wxString& name);
 185 #endif // wxUSE_DYNLIB_CLASS
 186
 187     // set the renderer to use, passing NULL reverts to using the default
 188     // renderer
 189     //
 190     // return the previous renderer used with Set() or NULL if none
 191     static wxRendererNative *Set(wxRendererNative *renderer);
 192
 193
 194     // miscellaneous stuff
 195     // -------------------
 196
 197     // this function is used for version checking: Load() refuses to load any
 198     // DLLs implementing an older or incompatible version; it should be
 199     // implemented simply by returning wxRendererVersion::Current_XXX values
 200     virtual wxRendererVersion GetVersion() const = 0;
 201
 202     // virtual dtor for any base class
 203     virtual ~wxRendererNative();
 204 };
 205
 206 // ----------------------------------------------------------------------------
 207 // wxDelegateRendererNative: allows reuse of renderers code
 208 // ----------------------------------------------------------------------------
 209
 210 class WXDLLEXPORT wxDelegateRendererNative : public wxRendererNative
 211 {
 212 public:
 213     wxDelegateRendererNative()
 214         : m_rendererNative(GetGeneric()) { }
 215
 216     wxDelegateRendererNative(wxRendererNative& rendererNative)
 217         : m_rendererNative(rendererNative) { }
 218
 219
 220     virtual void DrawHeaderButton(wxWindow *win,
 221                                   wxDC& dc,
 222                                   const wxRect& rect,
 223                                   int flags = 0)
 224         { m_rendererNative.DrawHeaderButton(win, dc, rect, flags); }
 225
 226     virtual void DrawTreeItemButton(wxWindow *win,
 227                                     wxDC& dc,
 228                                     const wxRect& rect,
 229                                     int flags = 0)
 230         { m_rendererNative.DrawTreeItemButton(win, dc, rect, flags); }
 231
 232     virtual void DrawSplitterBorder(wxWindow *win,
 233                                     wxDC& dc,
 234                                     const wxRect& rect,
 235                                     int flags = 0)
 236         { m_rendererNative.DrawSplitterBorder(win, dc, rect, flags); }
 237
 238     virtual void DrawSplitterSash(wxWindow *win,
 239                                   wxDC& dc,
 240                                   const wxSize& size,
 241                                   wxCoord position,
 242                                   wxOrientation orient,
 243                                   int flags = 0)
 244         { m_rendererNative.DrawSplitterSash(win, dc, size,
 245                                             position, orient, flags); }
 246
 247
 248     virtual wxSplitterRenderParams GetSplitterParams(const wxWindow *win)
 249         { return m_rendererNative.GetSplitterParams(win); }
 250
 251     virtual wxRendererVersion GetVersion() const
 252         { return m_rendererNative.GetVersion(); }
 253
 254 protected:
 255     wxRendererNative& m_rendererNative;
 256
 257     DECLARE_NO_COPY_CLASS(wxDelegateRendererNative)
 258 };
 259
 260 // ----------------------------------------------------------------------------
 261 // inline functions implementation
 262 // ----------------------------------------------------------------------------
 263
 264 #ifndef wxHAS_NATIVE_RENDERER
 265
 266 // default native renderer is the generic one then
 267 /* static */ inline
 268 wxRendererNative& wxRendererNative::GetDefault()
 269 {
 270     return GetGeneric();
 271 }
 272
 273 #endif // !wxHAS_NATIVE_RENDERER
 274
 275 #endif // _WX_RENDERER_H_
 276