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 WXDLLIMPEXP_FWD_CORE wxDC;
  29 class WXDLLIMPEXP_FWD_CORE wxWindow;
  30
  31 #include "wx/gdicmn.h" // for wxPoint
  32 #include "wx/colour.h"
  33 #include "wx/font.h"
  34 #include "wx/bitmap.h"
  35 #include "wx/string.h"
  36
  37 // some platforms have their own renderers, others use the generic one
  38 #if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXGTK__)
  39     #define wxHAS_NATIVE_RENDERER
  40 #else
  41     #undef wxHAS_NATIVE_RENDERER
  42 #endif
  43
  44 // ----------------------------------------------------------------------------
  45 // constants
  46 // ----------------------------------------------------------------------------
  47
  48 // control state flags used in wxRenderer and wxColourScheme
  49 enum
  50 {
  51     wxCONTROL_DISABLED   = 0x00000001,  // control is disabled
  52     wxCONTROL_FOCUSED    = 0x00000002,  // currently has keyboard focus
  53     wxCONTROL_PRESSED    = 0x00000004,  // (button) is pressed
  54     wxCONTROL_SPECIAL    = 0x00000008,  // control-specific bit:
  55     wxCONTROL_ISDEFAULT  = wxCONTROL_SPECIAL, // only for the buttons
  56     wxCONTROL_ISSUBMENU  = wxCONTROL_SPECIAL, // only for the menu items
  57     wxCONTROL_EXPANDED   = wxCONTROL_SPECIAL, // only for the tree items
  58     wxCONTROL_SIZEGRIP   = wxCONTROL_SPECIAL, // only for the status bar panes
  59     wxCONTROL_FLAT       = wxCONTROL_SPECIAL, // checkboxes only: flat border
  60     wxCONTROL_CURRENT    = 0x00000010,  // mouse is currently over the control
  61     wxCONTROL_SELECTED   = 0x00000020,  // selected item in e.g. listbox
  62     wxCONTROL_CHECKED    = 0x00000040,  // (check/radio button) is checked
  63     wxCONTROL_CHECKABLE  = 0x00000080,  // (menu) item can be checked
  64     wxCONTROL_UNDETERMINED = wxCONTROL_CHECKABLE, // (check) undetermined state
  65
  66     wxCONTROL_FLAGS_MASK = 0x000000ff,
  67
  68     // this is a pseudo flag not used directly by wxRenderer but rather by some
  69     // controls internally
  70     wxCONTROL_DIRTY      = 0x80000000
  71 };
  72
  73 // ----------------------------------------------------------------------------
  74 // helper structs
  75 // ----------------------------------------------------------------------------
  76
  77 // wxSplitterWindow parameters
  78 struct WXDLLEXPORT wxSplitterRenderParams
  79 {
  80     // the only way to initialize this struct is by using this ctor
  81     wxSplitterRenderParams(wxCoord widthSash_, wxCoord border_, bool isSens_)
  82         : widthSash(widthSash_), border(border_), isHotSensitive(isSens_)
  83         {
  84         }
  85
  86     // the width of the splitter sash
  87     const wxCoord widthSash;
  88
  89     // the width of the border of the splitter window
  90     const wxCoord border;
  91
  92     // true if the splitter changes its appearance when the mouse is over it
  93     const bool isHotSensitive;
  94 };
  95
  96
  97 // extra optional parameters for DrawHeaderButton
  98 struct WXDLLEXPORT wxHeaderButtonParams
  99 {
 100     wxHeaderButtonParams()
 101         : m_labelAlignment(wxALIGN_LEFT)
 102     { }
 103
 104     wxColour    m_arrowColour;
 105     wxColour    m_selectionColour;
 106     wxString    m_labelText;
 107     wxFont      m_labelFont;
 108     wxColour    m_labelColour;
 109     wxBitmap    m_labelBitmap;
 110     int         m_labelAlignment;
 111 };
 112
 113 enum wxHeaderSortIconType {
 114     wxHDR_SORT_ICON_NONE,        // Header button has no sort arrow
 115     wxHDR_SORT_ICON_UP,          // Header button an an up sort arrow icon
 116     wxHDR_SORT_ICON_DOWN         // Header button an a down sort arrow icon
 117 };
 118
 119
 120 // wxRendererNative interface version
 121 struct WXDLLEXPORT wxRendererVersion
 122 {
 123     wxRendererVersion(int version_, int age_) : version(version_), age(age_) { }
 124
 125     // default copy ctor, assignment operator and dtor are ok
 126
 127     // the current version and age of wxRendererNative interface: different
 128     // versions are incompatible (in both ways) while the ages inside the same
 129     // version are upwards compatible, i.e. the version of the renderer must
 130     // match the version of the main program exactly while the age may be
 131     // highergreater or equal to it
 132     //
 133     // NB: don't forget to increment age after adding any new virtual function!
 134     enum
 135     {
 136         Current_Version = 1,
 137         Current_Age = 5
 138     };
 139
 140
 141     // check if the given version is compatible with the current one
 142     static bool IsCompatible(const wxRendererVersion& ver)
 143     {
 144         return ver.version == Current_Version && ver.age >= Current_Age;
 145     }
 146
 147     const int version;
 148     const int age;
 149 };
 150
 151 // ----------------------------------------------------------------------------
 152 // wxRendererNative: abstracts drawing methods needed by the native controls
 153 // ----------------------------------------------------------------------------
 154
 155 class WXDLLEXPORT wxRendererNative
 156 {
 157 public:
 158     // drawing functions
 159     // -----------------
 160
 161     // draw the header control button (used by wxListCtrl) Returns optimal
 162     // width for the label contents.
 163     virtual int  DrawHeaderButton(wxWindow *win,
 164                                   wxDC& dc,
 165                                   const wxRect& rect,
 166                                   int flags = 0,
 167                                   wxHeaderSortIconType sortArrow = wxHDR_SORT_ICON_NONE,
 168                                   wxHeaderButtonParams* params=NULL) = 0;
 169
 170
 171     // Draw the contents of a header control button (label, sort arrows, etc.)
 172     // Normally only called by DrawHeaderButton.
 173     virtual int  DrawHeaderButtonContents(wxWindow *win,
 174                                           wxDC& dc,
 175                                           const wxRect& rect,
 176                                           int flags = 0,
 177                                           wxHeaderSortIconType sortArrow = wxHDR_SORT_ICON_NONE,
 178                                           wxHeaderButtonParams* params=NULL) = 0;
 179
 180     // Returns the default height of a header button, either a fixed platform
 181     // height if available, or a generic height based on the window's font.
 182     virtual int GetHeaderButtonHeight(wxWindow *win) = 0;
 183
 184
 185     // draw the expanded/collapsed icon for a tree control item
 186     virtual void DrawTreeItemButton(wxWindow *win,
 187                                     wxDC& dc,
 188                                     const wxRect& rect,
 189                                     int flags = 0) = 0;
 190
 191     // draw the border for sash window: this border must be such that the sash
 192     // drawn by DrawSash() blends into it well
 193     virtual void DrawSplitterBorder(wxWindow *win,
 194                                     wxDC& dc,
 195                                     const wxRect& rect,
 196                                     int flags = 0) = 0;
 197
 198     // draw a (vertical) sash
 199     virtual void DrawSplitterSash(wxWindow *win,
 200                                   wxDC& dc,
 201                                   const wxSize& size,
 202                                   wxCoord position,
 203                                   wxOrientation orient,
 204                                   int flags = 0) = 0;
 205
 206     // draw a combobox dropdown button
 207     //
 208     // flags may use wxCONTROL_PRESSED and wxCONTROL_CURRENT
 209     virtual void DrawComboBoxDropButton(wxWindow *win,
 210                                         wxDC& dc,
 211                                         const wxRect& rect,
 212                                         int flags = 0) = 0;
 213
 214     // draw a dropdown arrow
 215     //
 216     // flags may use wxCONTROL_PRESSED and wxCONTROL_CURRENT
 217     virtual void DrawDropArrow(wxWindow *win,
 218                                wxDC& dc,
 219                                const wxRect& rect,
 220                                int flags = 0) = 0;
 221
 222     // draw check button
 223     //
 224     // flags may use wxCONTROL_CHECKED, wxCONTROL_UNDETERMINED and wxCONTROL_CURRENT
 225     virtual void DrawCheckBox(wxWindow *win,
 226                               wxDC& dc,
 227                               const wxRect& rect,
 228                               int flags = 0) = 0;
 229
 230     // draw blank button
 231     //
 232     // flags may use wxCONTROL_PRESSED, wxCONTROL_CURRENT and wxCONTROL_ISDEFAULT
 233     virtual void DrawPushButton(wxWindow *win,
 234                                 wxDC& dc,
 235                                 const wxRect& rect,
 236                                 int flags = 0) = 0;
 237
 238     // draw rectangle indicating that an item in e.g. a list control
 239     // has been selected or focused
 240     //
 241     // flags may use
 242     // wxCONTROL_SELECTED (item is selected, e.g. draw background)
 243     // wxCONTROL_CURRENT (item is the current item, e.g. dotted border)
 244     // wxCONTROL_FOCUSED (the whole control has focus, e.g. blue background vs. grey otherwise)
 245     virtual void DrawItemSelectionRect(wxWindow *win,
 246                                        wxDC& dc,
 247                                        const wxRect& rect,
 248                                        int flags = 0) = 0;
 249
 250     // draw the focus rectangle around the label contained in the given rect
 251     //
 252     // only wxCONTROL_SELECTED makes sense in flags here
 253     virtual void DrawFocusRect(wxWindow* win, wxDC& dc, const wxRect& rect, int flags = 0) = 0;
 254
 255     // geometry functions
 256     // ------------------
 257
 258     // get the splitter parameters: the x field of the returned point is the
 259     // sash width and the y field is the border width
 260     virtual wxSplitterRenderParams GetSplitterParams(const wxWindow *win) = 0;
 261
 262
 263     // pseudo constructors
 264     // -------------------
 265
 266     // return the currently used renderer
 267     static wxRendererNative& Get();
 268
 269     // return the generic implementation of the renderer
 270     static wxRendererNative& GetGeneric();
 271
 272     // return the default (native) implementation for this platform
 273     static wxRendererNative& GetDefault();
 274
 275
 276     // changing the global renderer
 277     // ----------------------------
 278
 279 #if wxUSE_DYNLIB_CLASS
 280     // load the renderer from the specified DLL, the returned pointer must be
 281     // deleted by caller if not NULL when it is not used any more
 282     static wxRendererNative *Load(const wxString& name);
 283 #endif // wxUSE_DYNLIB_CLASS
 284
 285     // set the renderer to use, passing NULL reverts to using the default
 286     // renderer
 287     //
 288     // return the previous renderer used with Set() or NULL if none
 289     static wxRendererNative *Set(wxRendererNative *renderer);
 290
 291
 292     // miscellaneous stuff
 293     // -------------------
 294
 295     // this function is used for version checking: Load() refuses to load any
 296     // DLLs implementing an older or incompatible version; it should be
 297     // implemented simply by returning wxRendererVersion::Current_XXX values
 298     virtual wxRendererVersion GetVersion() const = 0;
 299
 300     // virtual dtor for any base class
 301     virtual ~wxRendererNative();
 302 };
 303
 304 // ----------------------------------------------------------------------------
 305 // wxDelegateRendererNative: allows reuse of renderers code
 306 // ----------------------------------------------------------------------------
 307
 308 class WXDLLEXPORT wxDelegateRendererNative : public wxRendererNative
 309 {
 310 public:
 311     wxDelegateRendererNative()
 312         : m_rendererNative(GetGeneric()) { }
 313
 314     wxDelegateRendererNative(wxRendererNative& rendererNative)
 315         : m_rendererNative(rendererNative) { }
 316
 317
 318     virtual int  DrawHeaderButton(wxWindow *win,
 319                                   wxDC& dc,
 320                                   const wxRect& rect,
 321                                   int flags = 0,
 322                                   wxHeaderSortIconType sortArrow = wxHDR_SORT_ICON_NONE,
 323                                   wxHeaderButtonParams* params = NULL)
 324         { return m_rendererNative.DrawHeaderButton(win, dc, rect, flags, sortArrow, params); }
 325
 326     virtual int  DrawHeaderButtonContents(wxWindow *win,
 327                                           wxDC& dc,
 328                                           const wxRect& rect,
 329                                           int flags = 0,
 330                                           wxHeaderSortIconType sortArrow = wxHDR_SORT_ICON_NONE,
 331                                           wxHeaderButtonParams* params = NULL)
 332         { return m_rendererNative.DrawHeaderButtonContents(win, dc, rect, flags, sortArrow, params); }
 333
 334     virtual int GetHeaderButtonHeight(wxWindow *win)
 335         { return m_rendererNative.GetHeaderButtonHeight(win); }
 336
 337     virtual void DrawTreeItemButton(wxWindow *win,
 338                                     wxDC& dc,
 339                                     const wxRect& rect,
 340                                     int flags = 0)
 341         { m_rendererNative.DrawTreeItemButton(win, dc, rect, flags); }
 342
 343     virtual void DrawSplitterBorder(wxWindow *win,
 344                                     wxDC& dc,
 345                                     const wxRect& rect,
 346                                     int flags = 0)
 347         { m_rendererNative.DrawSplitterBorder(win, dc, rect, flags); }
 348
 349     virtual void DrawSplitterSash(wxWindow *win,
 350                                   wxDC& dc,
 351                                   const wxSize& size,
 352                                   wxCoord position,
 353                                   wxOrientation orient,
 354                                   int flags = 0)
 355         { m_rendererNative.DrawSplitterSash(win, dc, size,
 356                                             position, orient, flags); }
 357
 358     virtual void DrawComboBoxDropButton(wxWindow *win,
 359                                         wxDC& dc,
 360                                         const wxRect& rect,
 361                                         int flags = 0)
 362         { m_rendererNative.DrawComboBoxDropButton(win, dc, rect, flags); }
 363
 364     virtual void DrawDropArrow(wxWindow *win,
 365                                wxDC& dc,
 366                                const wxRect& rect,
 367                                int flags = 0)
 368         { m_rendererNative.DrawDropArrow(win, dc, rect, flags); }
 369
 370     virtual void DrawCheckBox(wxWindow *win,
 371                               wxDC& dc,
 372                               const wxRect& rect,
 373                               int flags = 0 )
 374         { m_rendererNative.DrawCheckBox( win, dc, rect, flags ); }
 375
 376     virtual void DrawPushButton(wxWindow *win,
 377                                 wxDC& dc,
 378                                 const wxRect& rect,
 379                                 int flags = 0 )
 380         { m_rendererNative.DrawPushButton( win, dc, rect, flags ); }
 381
 382     virtual void DrawItemSelectionRect(wxWindow *win,
 383                                        wxDC& dc,
 384                                        const wxRect& rect,
 385                                        int flags = 0 )
 386         { m_rendererNative.DrawItemSelectionRect( win, dc, rect, flags ); }
 387
 388     virtual void DrawFocusRect(wxWindow* win, wxDC& dc, const wxRect& rect, int flags = 0)
 389         { m_rendererNative.DrawFocusRect( win, dc, rect, flags ); }
 390
 391     virtual wxSplitterRenderParams GetSplitterParams(const wxWindow *win)
 392         { return m_rendererNative.GetSplitterParams(win); }
 393
 394     virtual wxRendererVersion GetVersion() const
 395         { return m_rendererNative.GetVersion(); }
 396
 397 protected:
 398     wxRendererNative& m_rendererNative;
 399
 400     DECLARE_NO_COPY_CLASS(wxDelegateRendererNative)
 401 };
 402
 403 // ----------------------------------------------------------------------------
 404 // inline functions implementation
 405 // ----------------------------------------------------------------------------
 406
 407 #ifndef wxHAS_NATIVE_RENDERER
 408
 409 // default native renderer is the generic one then
 410 /* static */ inline
 411 wxRendererNative& wxRendererNative::GetDefault()
 412 {
 413     return GetGeneric();
 414 }
 415
 416 #endif // !wxHAS_NATIVE_RENDERER
 417
 418 #endif // _WX_RENDERER_H_