wxWidgets-2.8.8.tar.gz_wxWidgets_wxWidgets 2.8.

wxMicroWindows port =================== Julian Smart 2001-12-08 This is a port of wxWidgets to MicroWindows, under Linux. Widgets are supplied by the wxUniversal project, while the underlying port uses the Windows ports with small modifications for the MicroWindows API. === NOTE: === Current efforts are being concentrated on a port to Nano-X, which potentially offers greater flexibility than the WIN32 API of MicroWindows, such as the ability to run multiple Nano-X processes simultaneously. Please see ../docs/x11/readme-nanox.txt for information. There are many things missing from MicroWindows that will make the port quite limited for the time being. In particular, only one WIN32 app may be run at a time. Note that you can gain confidence in the WIN32/wxUniversal combination by compiling wxUniversal under Windows using VC++, using src/wxUniv.dsp. You can compile the minimal and widgets samples in wxUniversal mode using the UnivDebug and UnivRelease targets. Most of the code is shared between this combination, and the wxMicroWindows port. Installation ============ MicroWindows: - unarchive MicroWindows 0.89pre8 - change 'config' to use X11 and any other options you feel fit. Suggestions for changes to the defaults: ERASEMOVE=N (otherwise moving windows will look messy) X11=Y OPTIMIZE=N DEBUG=Y VERBOSE=Y Note: these are already applied by the patch below. - apply microwindows.patches (from wxWidgets: docs/microwin/microwindows.patches) to fix PeekMessage and other issues. If the patch doesn't apply automatically, you may need to apply it by hand, and the relevant changed functions are given at the end of this file for convenience. Example patch command: % cd microwindows-0.89pre8.orig % patch -p0 < ~/wx2/docs/microwin/microwindows.patches - compile by typing 'make' from within the MicroWindows src directory wxMicroWindows: - Download wxMSW 2.3.4 or greater, or get it from CVS - Copy include/wx/msw/setup_microwin.h to include/wx/setup.h if include/wx/setup.h doesn't exist - EITHER: o set the MICROWINDOWS environment variable, e.g.: % export MICROWINDOWS=/home/julians/local/microwindows/microwindows-0.89pre8/src OR: o change the TOP variable at the top of src/msw/makefile.mic to reflect where MicroWindows is installed - type 'make -f makefile.mic all' from src/msw. To clean, use cleanwx and NOT clean since that will clean MicroWindows itself - to make the sample, cd into samples/minimal, edit the TOP variable (or set MICROWINDOWS) as before, and type 'make -f makefile.mic all' Running 'minimal' runs the virtual MicroWindows desktop and the minimal sample, since in a MicroWindows WIN32 application they are one and the same binary. Status ====== The minimal sample is almost fully-functional, apart from some presentation issues (no menu borders and status bar in the wrong place. The widgets sample is crashing in DeleteObject (see notes below). Implementation Notes ==================== wxMicroWindows is essentially the wxMSW port + wxUniversal widgets. Lots of things in include/wx/univ/setup.h are switched off to allow the port to compile. There are also #ifdefs switching off further functionality, such as most wxBitmap functions, pending proper implementation. There are some WIN32 API functions not implemented by MicroWindows that are instead stubbed out in include/wx/msw/microwin.c, and 'implemented' in src/msw/microwin.c. Some of these functions are important, some less so. They will need to be implemented in due course. But implementing missing functionality in this way is preferably to proliferating many #ifdefs in the wxMSW/wxMicroWindows port itself. Errors/warnings =============== In file ../../src/msw/window.cpp at line 1294: 'UpdateWindow' failed with error 0x00000000 (Success). - caused because there are no paint messages pending. Presumed harmless. In file ../../src/msw/dc.cpp at line 1838: 'BitBlt' failed with error 0x00000000 (Success). - caused because the window isn't mapped, and MwPrepareDC in wingdi.c fails (hwnd->unmapcount is non-zero). Presumed harmless. Recursive paint problem, e.g. when clicking the 'Press Me!' button in the widgets sample a few times, until the text control is full. - possibly the scrollbar is causing the text control to be updated, which somehow effects the scrollbar, which causes a window update, etc. Sluggish updates. - probably because many image to bitmap conversions are being done on update, and bitmaps should probably be cached. Things missing from MicroWindows that need to be worked around ============================================================== wxImage/inline XPM/::CreateBitmap support ----------------------------------------- This is the main obstacle to getting a good range of widgets working, since wxUniversal uses inline XPMs to implement most of the widgets. See src/engine/devimage.c for routines for loading JPEGs, XPMs etc. Unfortunately the XPM routines are also #ifdefed for FILE_IO, even though for inline XPMs we don't need file I/O. (Embedded systems tend not to have file I/O, anyway.) Now, wxWidgets has its own XPM decoder, src/common/xpmdecod.cpp, so in theory we don't need to use MicroWindows' code there. wxImage can load an inline XPM, _but_ we need to convert to a wxBitmap since this is what the widgets need. There is no ::CreateBitmap or BITMAPINFO. (BMPs can be converted to C using convbmp, then need to use Gr... functions.) So how can we convert from wxImage to wxBitmap in MicroWindows? Well, a simple-minded way would be to use CreateCompatibleBitmap which returns an HBITMAP, select it into an HDC, and draw the pixels from the wxImage to the HDC one by one with SetPixel. This is now implemented, but there are problems with masks. (a) masks have to be created at screen depth because BitBlt/GrDraw can't cope with differing depths, and (b) masked blitting is still not working (try enabling mask creation in wxBitmap::CreateFromImage by setting USE_MASKS to 1). Other missing features ---------------------- No ::GetKeyState (see include/wx/msw/private.h). Should probably use GdOpenKeyboard/GdCloseKeyboard/GdReadKeyboard. Could perhaps emulate GetKeyState this way. No ::DestroyIcon, ::DestroyCursor - use ::DestroyObject instead? Also no LoadCursor, LoadImage. So how do we make cursors? No ::SetCursor. wxDC: no ::GetTextColor, ::GetBkColor, ::IntersectClipRect, ::GetClipBox No ::SetMenu, so no menus or menubars (now implemented by wxUniversal). No ::GetObject so we can't get LOGFONT from an HFONT in wxSystemSettings (worked around by passing HFONT to the wxFont constructor). Applying patches by hand ======================== The full altered functions are given below in case you have to apply them by hand. src/mwin/winevent.c ------------------- A second test has been added to this line: if(hittest == HTCLIENT || hwnd == GetCapture()) { in MwTranslateMouseMessage below. This corrects a mouse message bug. /* * Translate and deliver hardware mouse message to proper window. */ void MwTranslateMouseMessage(HWND hwnd,UINT msg,int hittest) { POINT pt; DWORD tick; static UINT lastmsg = 0; static HWND lasthwnd; static DWORD lasttick; static int lastx, lasty; /* determine double click eligibility*/ if(msg == WM_LBUTTONDOWN || msg == WM_RBUTTONDOWN) { tick = GetTickCount(); if((hwnd->pClass->style & CS_DBLCLKS) && msg == lastmsg && hwnd == lasthwnd && tick - lasttick < DBLCLICKSPEED && abs(cursorx-lastx) < mwSYSMETRICS_CXDOUBLECLK && abs(cursory-lasty) < mwSYSMETRICS_CYDOUBLECLK) msg += (WM_LBUTTONDBLCLK - WM_LBUTTONDOWN); lastmsg = msg; lasthwnd = hwnd; lasttick = tick; lastx = cursorx; lasty = cursory; } /* * We always send nc mouse message * unlike Windows, for HTCLIENT default processing */ PostMessage(hwnd, msg + (WM_NCMOUSEMOVE-WM_MOUSEMOVE), hittest, MAKELONG(cursorx, cursory));