X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/46d0e4b2e6718753dedb4ec6872abf6cdf8f9f47..a97d569cbbf90ba8bb293214055c3a8c19d447b5:/docs/microwin/readme.txt?ds=sidebyside

diff --git a/docs/microwin/readme.txt b/docs/microwin/readme.txt
index 1e6152714c..2bc10af53d 100644
--- a/docs/microwin/readme.txt
+++ b/docs/microwin/readme.txt
@@ -1,22 +1,28 @@
 wxMicroWindows port
 ===================
 
-Julian Smart 2001-07-02
+Julian Smart 2001-12-08
 
-This is a port of wxWindows to MicroWindows, under Linux.
+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. I haven't
-worked out how to create bitmaps, though there is a BMP to C
-converter. There are no common dialogs (we will use generic ones),
-and only one WIN32 app may be run at a time.
+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/wxvc_universal.dsp. You can compile the minimal
+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.
@@ -26,7 +32,7 @@ Installation
 
 MicroWindows:
 
-- unarchive MicroWindows 0.89pre7
+- unarchive MicroWindows 0.89pre8
 
 - change 'config' to use X11 and any other options you feel fit.
   Suggestions for changes to the defaults:
@@ -37,24 +43,44 @@ MicroWindows:
   DEBUG=Y
   VERBOSE=Y
 
-- apply microwindows.patches (from wxWindows:
+  Note: these are already applied by the patch below.
+
+- apply microwindows.patches (from wxWidgets:
   docs/microwin/microwindows.patches) to fix PeekMessage
-  and other issues
+  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:
 
-- untar the wxMicroWindows port/download from CVS
+- 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:
 
-- change the TOP variable at the top of src/msw/makefile.mic
-  to reflect where MicroWindows is installed
+  o set the MICROWINDOWS environment variable, e.g.:
 
-- type 'make all' from src/msw. To clean, use cleanwx and NOT clean
-  since that will clean MicroWindows itself
+    % export MICROWINDOWS=/home/julians/local/microwindows/microwindows-0.89pre8/src
 
-- to make the sample, cd into samples/minimal, edit the TOP variable,
-  and type 'make all'
+  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
@@ -63,8 +89,12 @@ they are one and the same binary.
 Status
 ======
 
-The minimal sample is almost fully-functional, apart from minor
-menu presentation issues (no borders, for example).
+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
 ====================
@@ -83,20 +113,76 @@ 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 ::CreateBitmap or BITMAPINFO. But BMPs can be converted
-to C using convbmp, then need to use Gr... functions.
-We MUST implement creation from XPMs, since wxUniversal
-makes use of XPMs, or else create our own bitmaps for
-drawing radioboxes, checkboxes etc.: see renderers
-in src/univ.
-
 No ::DestroyIcon, ::DestroyCursor - use ::DestroyObject instead?
 Also no LoadCursor, LoadImage. So how do we make cursors? No ::SetCursor.
 
@@ -110,3 +196,139 @@ 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));
+
+	/* then possibly send user mouse message*/
+	if(hittest == HTCLIENT || hwnd == GetCapture()) {
+		pt.x = cursorx;
+		pt.y = cursory;
+		ScreenToClient(hwnd, &pt);
+		PostMessage(hwnd, msg, 0, MAKELONG(pt.x, pt.y));
+	}
+}
+
+winuser.c
+---------
+
+Part of PeekMessage has been factored out into PeekMessageHelper,
+and used in PeekMessage and GetMessage. The three relevant functions
+are:
+
+/*
+ * A helper function for sharing code between PeekMessage and GetMessage
+ */
+
+BOOL WINAPI
+PeekMessageHelper(LPMSG lpMsg, HWND hwnd, UINT uMsgFilterMin, UINT uMsgFilterMax,
+	UINT wRemoveMsg, BOOL returnIfEmptyQueue)
+{
+	HWND	wp;
+	PMSG	pNxtMsg;
+
+	/* check if no messages in queue*/
+	if(mwMsgHead.head == NULL) {
+                /* Added by JACS so it doesn't reach MwSelect */
+                if (returnIfEmptyQueue)
+                    return FALSE;
+
+#if PAINTONCE
+		/* check all windows for pending paint messages*/
+		for(wp=listwp; wp; wp=wp->next) {
+			if(!(wp->style & WS_CHILD)) {
+				if(chkPaintMsg(wp, lpMsg))
+					return TRUE;
+			}
+		}
+		for(wp=listwp; wp; wp=wp->next) {
+			if(wp->style & WS_CHILD) {
+				if(chkPaintMsg(wp, lpMsg))
+					return TRUE;
+			}
+		}
+#endif
+		MwSelect();
+	}
+
+	if(mwMsgHead.head == NULL)
+		return FALSE;
+
+	pNxtMsg = (PMSG)mwMsgHead.head;
+	if(wRemoveMsg & PM_REMOVE)
+		GdListRemove(&mwMsgHead, &pNxtMsg->link);
+	*lpMsg = *pNxtMsg;
+	if(wRemoveMsg & PM_REMOVE)
+		GdItemFree(pNxtMsg);
+	return TRUE;
+}
+
+BOOL WINAPI
+PeekMessage(LPMSG lpMsg, HWND hwnd, UINT uMsgFilterMin, UINT uMsgFilterMax,
+	UINT wRemoveMsg)
+{
+        /* Never wait in MwSelect: pass TRUE */
+        return PeekMessageHelper(lpMsg, hwnd, uMsgFilterMin, uMsgFilterMax, wRemoveMsg, TRUE);
+}
+
+BOOL WINAPI
+GetMessage(LPMSG lpMsg,HWND hwnd,UINT wMsgFilterMin,UINT wMsgFilterMax)
+{
+	/*
+	 * currently MwSelect() must poll for VT switch reasons,
+	 * so this code will work
+	 */
+        /* Always wait in MwSelect if there are messages: pass FALSE */
+	while(!PeekMessageHelper(lpMsg, hwnd, wMsgFilterMin, wMsgFilterMax,PM_REMOVE, FALSE))
+		continue;
+	return lpMsg->message != WM_QUIT;
+}