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unit wcore;
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{
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lcore compatible interface for windows
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- messageloop
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- tltimer
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}
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//note: events after release are normal and are the apps responsibility to deal with safely
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interface
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uses
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classes,windows,mmsystem;
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type
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float=double;
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tlcomponent = class(tcomponent)
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public
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released:boolean;
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procedure release;
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destructor destroy; override;
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end;
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tltimer=class(tlcomponent)
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private
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fenabled : boolean;
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procedure setenabled(newvalue : boolean);
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public
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ontimer:tnotifyevent;
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initialevent:boolean;
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initialdone:boolean;
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prevtimer:tltimer;
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nexttimer:tltimer;
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interval:integer; {milliseconds, default 1000}
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nextts:integer;
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property enabled:boolean read fenabled write setenabled;
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constructor create(aowner:tcomponent);override;
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destructor destroy;override;
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end;
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ttaskevent=procedure(wparam,lparam:longint) of object;
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tltask=class(tobject)
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public
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handler : ttaskevent;
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obj : tobject;
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wparam : longint;
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lparam : longint;
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nexttask : tltask;
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constructor create(ahandler:ttaskevent;aobj:tobject;awparam,alparam:longint);
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end;
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procedure messageloop;
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procedure addtask(ahandler:ttaskevent;aobj:tobject;awparam,alparam:longint);
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procedure disconnecttasks(aobj:tobject);
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procedure exitmessageloop;
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procedure processmessages;
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procedure wcoreinit;
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var
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onshutdown:procedure(s:ansistring);
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implementation
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uses
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{$ifdef fpc}
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bmessages;
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{$else}
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messages;
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{$endif}
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const
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WINMSG_TASK=WM_USER;
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var
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hwndwcore:hwnd;
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firsttimer:tltimer;
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timesubtract:integer;
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firsttask,lasttask,currenttask:tltask;
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procedure tlcomponent.release;
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begin
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released := true;
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end;
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destructor tlcomponent.destroy;
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begin
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disconnecttasks(self);
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inherited destroy;
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end;
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{------------------------------------------------------------------------------}
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procedure tltimer.setenabled(newvalue : boolean);
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begin
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fenabled := newvalue;
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nextts := 0;
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initialdone := false;
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end;
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constructor tltimer.create;
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begin
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inherited create(AOwner);
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nexttimer := firsttimer;
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prevtimer := nil;
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if assigned(nexttimer) then nexttimer.prevtimer := self;
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firsttimer := self;
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interval := 1000;
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enabled := true;
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released := false;
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end;
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destructor tltimer.destroy;
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begin
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if prevtimer <> nil then begin
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prevtimer.nexttimer := nexttimer;
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end else begin
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firsttimer := nexttimer;
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end;
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if nexttimer <> nil then begin
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nexttimer.prevtimer := prevtimer;
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end;
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inherited destroy;
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end;
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{------------------------------------------------------------------------------}
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function wcore_timehandler:integer;
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const
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rollover_bits=30;
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var
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tv,tvnow:integer;
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currenttimer,temptimer:tltimer;
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begin
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if not assigned(firsttimer) then begin
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result := 1000;
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exit;
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end;
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tvnow := timegettime;
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if (tvnow and ((-1) shl rollover_bits)) <> timesubtract then begin
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currenttimer := firsttimer;
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while assigned(currenttimer) do begin
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dec(currenttimer.nextts,(1 shl rollover_bits));
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currenttimer := currenttimer.nexttimer;
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end;
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timesubtract := tvnow and ((-1) shl rollover_bits);
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end;
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tvnow := tvnow and ((1 shl rollover_bits)-1);
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currenttimer := firsttimer;
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while assigned(currenttimer) do begin
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if tvnow >= currenttimer.nextts then begin
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if assigned(currenttimer.ontimer) then begin
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if currenttimer.enabled then begin
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if currenttimer.initialevent or currenttimer.initialdone then currenttimer.ontimer(currenttimer);
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currenttimer.initialdone := true;
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end;
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end;
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currenttimer.nextts := tvnow+currenttimer.interval;
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end;
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temptimer := currenttimer;
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currenttimer := currenttimer.nexttimer;
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if temptimer.released then temptimer.free;
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end;
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tv := maxlongint;
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currenttimer := firsttimer;
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while assigned(currenttimer) do begin
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if currenttimer.nextts < tv then tv := currenttimer.nextts;
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currenttimer := currenttimer.nexttimer;
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end;
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result := tv-tvnow;
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if result < 15 then result := 15;
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end;
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{------------------------------------------------------------------------------}
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constructor tltask.create(ahandler:ttaskevent;aobj:tobject;awparam,alparam:longint);
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begin
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inherited create;
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handler := ahandler;
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obj := aobj;
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wparam := awparam;
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lparam := alparam;
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{nexttask := firsttask;
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firsttask := self;}
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if assigned(lasttask) then begin
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lasttask.nexttask := self;
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end else begin
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firsttask := self;
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postmessage(hwndwcore,WINMSG_TASK,0,0);
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end;
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lasttask := self;
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//ahandler(wparam,lparam);
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end;
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procedure addtask(ahandler:ttaskevent;aobj:tobject;awparam,alparam:longint);
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begin
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tltask.create(ahandler,aobj,awparam,alparam);
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end;
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procedure disconnecttasks(aobj:tobject);
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var
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currenttasklocal : tltask ;
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counter : byte ;
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begin
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for counter := 0 to 1 do begin
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if counter = 0 then begin
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currenttasklocal := firsttask; //main list of tasks
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end else begin
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currenttasklocal := currenttask; //needed in case called from a task
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end;
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// note i don't bother to destroy the links here as that will happen when
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// the list of tasks is processed anyway
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while assigned(currenttasklocal) do begin
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if currenttasklocal.obj = aobj then begin
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currenttasklocal.obj := nil;
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currenttasklocal.handler := nil;
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end;
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currenttasklocal := currenttasklocal.nexttask;
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end;
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end;
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end;
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procedure dotasks;
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var
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temptask:tltask;
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begin
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if firsttask = nil then exit;
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currenttask := firsttask;
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firsttask := nil;
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lasttask := nil;
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while assigned(currenttask) do begin
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if assigned(currenttask.handler) then currenttask.handler(currenttask.wparam,currenttask.lparam);
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temptask := currenttask;
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currenttask := currenttask.nexttask;
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temptask.free;
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end;
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currenttask := nil;
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end;
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{------------------------------------------------------------------------------}
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procedure exitmessageloop;
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begin
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postmessage(hwndwcore,WM_QUIT,0,0);
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end;
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{$ifdef threadtimer}
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'thread timer'
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{$else}
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const timerid_wcore=$1000;
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{$endif}
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function MyWindowProc(
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ahWnd : HWND;
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auMsg : Integer;
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awParam : WPARAM;
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alParam : LPARAM): Integer; stdcall;
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var
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MsgRec : TMessage;
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a:integer;
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begin
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Result := 0; // This means we handled the message
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{MsgRec.hwnd := ahWnd;}
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MsgRec.wParam := awParam;
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MsgRec.lParam := alParam;
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dotasks;
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case auMsg of
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{$ifndef threadtimer}
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WM_TIMER: begin
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if msgrec.wparam = timerid_wcore then begin
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a := wcore_timehandler;
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killtimer(hwndwcore,timerid_wcore);
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settimer(hwndwcore,timerid_wcore,a,nil);
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end;
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end;
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{$endif}
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{WINMSG_TASK:dotasks;}
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WM_CLOSE: begin
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{}
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end;
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WM_DESTROY: begin
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{}
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end;
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else
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Result := DefWindowProc(ahWnd, auMsg, awParam, alParam)
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end;
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end;
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var
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MyWindowClass : TWndClass = (style : 0;
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lpfnWndProc : @MyWindowProc;
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cbClsExtra : 0;
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cbWndExtra : 0;
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hInstance : 0;
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hIcon : 0;
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hCursor : 0;
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hbrBackground : 0;
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lpszMenuName : nil;
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lpszClassName : 'wcoreClass');
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procedure wcoreinit;
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begin
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if Windows.RegisterClass(MyWindowClass) = 0 then halt;
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//writeln('about to create wcore handle, hinstance=',hinstance);
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hwndwcore := CreateWindowEx(WS_EX_TOOLWINDOW,
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MyWindowClass.lpszClassName,
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'', { Window name }
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WS_POPUP, { Window Style }
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0, 0, { X, Y }
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0, 0, { Width, Height }
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0, { hWndParent }
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0, { hMenu }
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HInstance, { hInstance }
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nil); { CreateParam }
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if hwndwcore = 0 then halt;
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{$ifdef threadtimer}
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'thread timer'
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{$else}
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if settimer(hwndwcore,timerid_wcore,15,nil) = 0 then halt;
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{$endif}
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end;
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procedure messageloop;
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var
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MsgRec : TMsg;
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begin
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while GetMessage(MsgRec, 0, 0, 0) do begin
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TranslateMessage(MsgRec);
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DispatchMessage(MsgRec);
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{if not peekmessage(msgrec,0,0,0,PM_NOREMOVE) then onidle}
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end;
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if hWndwcore <> 0 then begin
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DestroyWindow(hwndwcore);
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hWndwcore := 0;
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end;
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{$ifdef threadtimer}
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'thread timer'
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{$else}
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killtimer(hwndwcore,timerid_wcore);
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{$endif}
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end;
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function ProcessMessage : Boolean;
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var
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MsgRec : TMsg;
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begin
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Result := FALSE;
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if PeekMessage(MsgRec, 0, 0, 0, PM_REMOVE) then begin
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Result := TRUE;
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TranslateMessage(MsgRec);
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DispatchMessage(MsgRec);
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end;
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end;
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procedure processmessages;
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begin
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while processmessage do;
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end;
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end.
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