docs/microwin/readme.txt

   1 wxMicroWindows port
   2 ===================
   3
   4 Julian Smart 2001-12-08
   5
   6 This is a port of wxWindows to MicroWindows, under Linux.
   7 Widgets are supplied by the wxUniversal project, while the
   8 underlying port uses the Windows ports with small modifications
   9 for the MicroWindows API.
  10
  11 There are many things missing from MicroWindows that will
  12 make the port quite limited for the time being. I haven't
  13 worked out how to create bitmaps, though there is a BMP to C
  14 converter. There are no common dialogs (we will use generic ones),
  15 and only one WIN32 app may be run at a time.
  16
  17 Note that you can gain confidence in the WIN32/wxUniversal
  18 combination by compiling wxUniversal under Windows using VC++,
  19 using src/wxvc_universal.dsp. You can compile the minimal
  20 and widgets samples in wxUniversal mode using the
  21 UnivDebug and UnivRelease targets. Most of the code is shared
  22 between this combination, and the wxMicroWindows port.
  23
  24 Installation
  25 ============
  26
  27 MicroWindows:
  28
  29 - unarchive MicroWindows 0.89pre8
  30
  31 - change 'config' to use X11 and any other options you feel fit.
  32   Suggestions for changes to the defaults:
  33
  34   ERASEMOVE=N (otherwise moving windows will look messy)
  35   X11=Y
  36   OPTIMIZE=N
  37   DEBUG=Y
  38   VERBOSE=Y
  39
  40   Note: these are already applied by the patch below.
  41
  42 - apply microwindows.patches (from wxWindows:
  43   docs/microwin/microwindows.patches) to fix PeekMessage
  44   and other issues. If the patch doesn't apply automatically,
  45   you may need to apply it by hand, and the relevant changed
  46   functions are given at the end of this file for convenience.
  47
  48   Example patch command:
  49
  50   % cd microwindows-0.89pre8.orig
  51   % patch -p0 < ~/wx2/docs/microwin/microwindows.patches
  52
  53 - compile by typing 'make' from within the MicroWindows src directory
  54
  55 wxMicroWindows:
  56
  57 - Download wxMSW 2.3.2 or greater, or get it from CVS
  58
  59 - Copy include/wx/msw/setup_microwin.h to include/wx/setup.h if
  60   include/wx/setup.h doesn't exist
  61
  62 - EITHER:
  63
  64   o set the MICROWINDOWS environment variable, e.g.:
  65
  66     % export MICROWINDOWS=/home/julians/local/microwindows/microwindows-0.89pre8/src
  67
  68   OR:
  69
  70   o change the TOP variable at the top of src/msw/makefile.mic
  71     to reflect where MicroWindows is installed
  72
  73 - type 'make -f makefile.mic all' from src/msw. To clean, use
  74   cleanwx and NOT clean since that will clean MicroWindows itself
  75
  76 - to make the sample, cd into samples/minimal, edit the TOP variable
  77   (or set MICROWINDOWS) as before, and type 'make -f makefile.mic all'
  78
  79 Running 'minimal' runs the virtual MicroWindows desktop
  80 and the minimal sample, since in a MicroWindows WIN32 application
  81 they are one and the same binary.
  82
  83 Status
  84 ======
  85
  86 The minimal sample is almost fully-functional, apart from minor
  87 menu presentation issues (no borders, for example).
  88
  89 Implementation Notes
  90 ====================
  91
  92 wxMicroWindows is essentially the wxMSW port + wxUniversal
  93 widgets. Lots of things in include/wx/univ/setup.h are switched
  94 off to allow the port to compile. There are also #ifdefs
  95 switching off further functionality, such as most wxBitmap
  96 functions, pending proper implementation.
  97
  98 There are some WIN32 API functions not implemented by MicroWindows
  99 that are instead stubbed out in include/wx/msw/microwin.c,
 100 and 'implemented' in src/msw/microwin.c. Some of these functions
 101 are important, some less so. They will need to be implemented
 102 in due course. But implementing missing functionality in this way
 103 is preferably to proliferating many #ifdefs in the
 104 wxMSW/wxMicroWindows port itself.
 105
 106 Things missing from MicroWindows that need to be worked around
 107 ==============================================================
 108
 109 No ::GetKeyState (see include/wx/msw/private.h). Should probably use
 110 GdOpenKeyboard/GdCloseKeyboard/GdReadKeyboard. Could perhaps emulate
 111 GetKeyState this way.
 112
 113 No ::CreateBitmap or BITMAPINFO. But BMPs can be converted
 114 to C using convbmp, then need to use Gr... functions.
 115 We MUST implement creation from XPMs, since wxUniversal
 116 makes use of XPMs, or else create our own bitmaps for
 117 drawing radioboxes, checkboxes etc.: see renderers
 118 in src/univ.
 119
 120 No ::DestroyIcon, ::DestroyCursor - use ::DestroyObject instead?
 121 Also no LoadCursor, LoadImage. So how do we make cursors? No ::SetCursor.
 122
 123 wxDC: no ::GetTextColor, ::GetBkColor, ::IntersectClipRect,
 124 ::GetClipBox
 125
 126 No ::SetMenu, so no menus or menubars (now implemented by
 127 wxUniversal).
 128
 129 No ::GetObject so we can't get LOGFONT from an HFONT
 130 in wxSystemSettings (worked around by passing HFONT to
 131 the wxFont constructor).
 132
 133
 134 Applying patches by hand
 135 ========================
 136
 137 The full altered functions are given below in case you have
 138 to apply them by hand.
 139
 140 src/mwin/winevent.c
 141 -------------------
 142
 143 A second test has been added to this line:
 144
 145         if(hittest == HTCLIENT || hwnd == GetCapture()) {
 146
 147 in MwTranslateMouseMessage below. This corrects a mouse message
 148 bug.
 149
 150 /*
 151  * Translate and deliver hardware mouse message to proper window.
 152  */
 153 void
 154 MwTranslateMouseMessage(HWND hwnd,UINT msg,int hittest)
 155 {
 156         POINT           pt;
 157         DWORD           tick;
 158         static UINT     lastmsg = 0;
 159         static HWND     lasthwnd;
 160         static DWORD    lasttick;
 161         static int      lastx, lasty;
 162
 163         /* determine double click eligibility*/
 164         if(msg == WM_LBUTTONDOWN || msg == WM_RBUTTONDOWN) {
 165                 tick = GetTickCount();
 166                 if((hwnd->pClass->style & CS_DBLCLKS) &&
 167                     msg == lastmsg && hwnd == lasthwnd &&
 168                     tick - lasttick < DBLCLICKSPEED &&
 169                     abs(cursorx-lastx) < mwSYSMETRICS_CXDOUBLECLK &&
 170                     abs(cursory-lasty) < mwSYSMETRICS_CYDOUBLECLK)
 171                         msg += (WM_LBUTTONDBLCLK - WM_LBUTTONDOWN);
 172                 lastmsg = msg;
 173                 lasthwnd = hwnd;
 174                 lasttick = tick;
 175                 lastx = cursorx;
 176                 lasty = cursory;
 177         }
 178
 179         /*
 180          * We always send nc mouse message
 181          * unlike Windows, for HTCLIENT default processing
 182          */
 183         PostMessage(hwnd, msg + (WM_NCMOUSEMOVE-WM_MOUSEMOVE), hittest,
 184                 MAKELONG(cursorx, cursory));
 185
 186         /* then possibly send user mouse message*/
 187         if(hittest == HTCLIENT || hwnd == GetCapture()) {
 188                 pt.x = cursorx;
 189                 pt.y = cursory;
 190                 ScreenToClient(hwnd, &pt);
 191                 PostMessage(hwnd, msg, 0, MAKELONG(pt.x, pt.y));
 192         }
 193 }
 194
 195 winuser.c
 196 ---------
 197
 198 Part of PeekMessage has been factored out into PeekMessageHelper,
 199 and used in PeekMessage and GetMessage. The three relevant functions
 200 are:
 201
 202 /*
 203  * A helper function for sharing code between PeekMessage and GetMessage
 204  */
 205
 206 BOOL WINAPI
 207 PeekMessageHelper(LPMSG lpMsg, HWND hwnd, UINT uMsgFilterMin, UINT uMsgFilterMax,
 208         UINT wRemoveMsg, BOOL returnIfEmptyQueue)
 209 {
 210         HWND    wp;
 211         PMSG    pNxtMsg;
 212
 213         /* check if no messages in queue*/
 214         if(mwMsgHead.head == NULL) {
 215                 /* Added by JACS so it doesn't reach MwSelect */
 216                 if (returnIfEmptyQueue)
 217                     return FALSE;
 218
 219 #if PAINTONCE
 220                 /* check all windows for pending paint messages*/
 221                 for(wp=listwp; wp; wp=wp->next) {
 222                         if(!(wp->style & WS_CHILD)) {
 223                                 if(chkPaintMsg(wp, lpMsg))
 224                                         return TRUE;
 225                         }
 226                 }
 227                 for(wp=listwp; wp; wp=wp->next) {
 228                         if(wp->style & WS_CHILD) {
 229                                 if(chkPaintMsg(wp, lpMsg))
 230                                         return TRUE;
 231                         }
 232                 }
 233 #endif
 234                 MwSelect();
 235         }
 236
 237         if(mwMsgHead.head == NULL)
 238                 return FALSE;
 239
 240         pNxtMsg = (PMSG)mwMsgHead.head;
 241         if(wRemoveMsg & PM_REMOVE)
 242                 GdListRemove(&mwMsgHead, &pNxtMsg->link);
 243         *lpMsg = *pNxtMsg;
 244         if(wRemoveMsg & PM_REMOVE)
 245                 GdItemFree(pNxtMsg);
 246         return TRUE;
 247 }
 248
 249 BOOL WINAPI
 250 PeekMessage(LPMSG lpMsg, HWND hwnd, UINT uMsgFilterMin, UINT uMsgFilterMax,
 251         UINT wRemoveMsg)
 252 {
 253         /* Never wait in MwSelect: pass TRUE */
 254         return PeekMessageHelper(lpMsg, hwnd, uMsgFilterMin, uMsgFilterMax, wRemoveMsg, TRUE);
 255 }
 256
 257 BOOL WINAPI
 258 GetMessage(LPMSG lpMsg,HWND hwnd,UINT wMsgFilterMin,UINT wMsgFilterMax)
 259 {
 260         /*
 261          * currently MwSelect() must poll for VT switch reasons,
 262          * so this code will work
 263          */
 264         /* Always wait in MwSelect if there are messages: pass FALSE */
 265         while(!PeekMessageHelper(lpMsg, hwnd, wMsgFilterMin, wMsgFilterMax,PM_REMOVE, FALSE))
 266                 continue;
 267         return lpMsg->message != WM_QUIT;
 268 }