{"id":25813,"date":"2022-12-13T13:46:44","date_gmt":"2022-12-13T08:16:44","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-my-thread-run-after-form-creation\/"},"modified":"2022-12-13T13:46:44","modified_gmt":"2022-12-13T08:16:44","slug":"solved-why-my-thread-run-after-form-creation","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-my-thread-run-after-form-creation\/","title":{"rendered":"[Solved] Why my Thread run after Form creation?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-23319548\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"23319548\" data-parentid=\"23265973\" data-score=\"-2\" data-position-on-page=\"6\" data-highest-scored=\"0\" data-question-has-accepted-highest-score=\"0\" itemprop=\"suggestedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<pre><code>unit AniThread;\n\ninterface \n\nuses \n  Classes, Windows, Controls, Graphics; \n\ntype \n  TAnimationThread = class(TThread) \n  private \n    { private declarations } \n    FWnd: HWND; \n    FPaintRect: TRect; \n    FbkColor, FfgColor: TColor; \n    FInterval: integer; \n  protected \n    procedure Execute; override; \n  public \n    constructor Create(paintsurface : TWinControl; {Control to paint on } \n      paintrect : TRect;          { area for animation bar }\n      bkColor, barcolor : TColor; { colors to use }\n      interval : integer);        { wait in msecs between paints}\n  end; \n\nimplementation \n\nconstructor TAnimationThread.Create(paintsurface : TWinControl; \n  paintrect : TRect; bkColor, barcolor : TColor; interval : integer); \nbegin \n  inherited Create(True); \n  FWnd := paintsurface.Handle; \n  FPaintRect := paintrect; \n  FbkColor := bkColor; \n  FfgColor := barColor; \n  FInterval := interval; \n  FreeOnterminate := True; \n  Resume; \nend; { TAnimationThread.Create } \n\nprocedure TAnimationThread.Execute; \nvar \n  image : TBitmap; \n  DC : HDC; \n  left, right : integer; \n  increment : integer; \n  imagerect : TRect; \n  state : (incRight, incLeft, decLeft, decRight); \nbegin \n  Image := TBitmap.Create; \n  try \n    with Image do  \n    begin \n      Width := FPaintRect.Right - FPaintRect.Left; \n      Height := FPaintRect.Bottom - FPaintRect.Top; \n      imagerect := Rect(0, 0, Width, Height); \n    end; { with } \n    left := 0; \n    right := 0; \n    increment := imagerect.right div 50; \n    state := Low(State); \n    while not Terminated do  \n    begin \n      with Image.Canvas do  \n      begin \n        Brush.Color := FbkColor; \n        FillRect(imagerect); \n        case state of \n          incRight:  \n          begin \n            Inc(right, increment); \n            if right &gt; imagerect.right then  \n            begin \n              right := imagerect.right; \n              Inc(state); \n            end; { if } \n          end; { case incRight } \n          incLeft:  \n          begin \n            Inc(left, increment); \n            if left &gt;= right then  \n            begin \n              left := right; \n              Inc(state); \n            end; { if } \n          end; { case incLeft } \n          decLeft:  \n          begin \n            Dec(left, increment); \n            if left &lt;= 0 then  \n            begin \n              left := 0; \n              Inc(state); \n            end; { if } \n          end; { case decLeft } \n          decRight:  \n          begin \n            Dec(right, increment); \n            if right &lt;= 0 then  \n            begin \n              right := 0; \n              state := incRight; \n            end; { if } \n          end; { case decLeft } \n        end; { case } \n        Brush.Color := FfgColor; \n        FillRect(Rect(left, imagerect.top, right, imagerect.bottom)); \n      end; { with } \n      DC := GetDC(FWnd); \n      if DC &lt;&gt; 0 then \n        try \n          BitBlt(DC, \n            FPaintRect.Left, \n            FPaintRect.Top, \n            imagerect.right, \n            imagerect.bottom, \n            Image.Canvas.handle, \n            0, 0, \n            SRCCOPY); \n        finally \n          ReleaseDC(FWnd, DC); \n        end; \n      Sleep(FInterval); \n    end; { while } \n  finally \n    Image.Free; \n  end; \n  InvalidateRect(FWnd, nil, True); \nend; { TAnimationThread.Execute } \n\nend. \n\n\/\/============================ HOW to USE IT ============================\n{\n Usage: \n Place a TPanel on a form, size it as appropriate.Create an instance of the \n TanimationThread call like this: procedure TForm1.Button1Click(Sender : TObject); } \nvar \n  ani : TAnimationThread; \n  r : TRect; \nbegin\n  r := Panel1.ClientRect;\n  InflateRect(r, - Panel1.BevelWidth, - Panel1.BevelWidth);\n  ani := TAnimationThread.Create(Panel1, r, Panel1.color, clBlue, 25);\n  Button1.Enabled := False; \n  Application.ProcessMessages; \n  Sleep(30000);  \/\/ replace with query.Open or such \n  Button1.Enabled := True; \n  ani.Terminate; \n  ShowMessage('Done'); \nend.\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">4<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Why my Thread run after Form creation? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] unit AniThread; interface uses Classes, Windows, Controls, Graphics; type TAnimationThread = class(TThread) private { private declarations } FWnd: HWND; FPaintRect: TRect; FbkColor, FfgColor: TColor; FInterval: integer; protected procedure Execute; override; public constructor Create(paintsurface : TWinControl; {Control to paint on } paintrect : TRect; { area for animation bar } bkColor, barcolor : TColor; { &#8230; <a title=\"[Solved] Why my Thread run after Form creation?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-why-my-thread-run-after-form-creation\/\" aria-label=\"More on [Solved] Why my Thread run after Form creation?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1033,740,884],"class_list":["post-25813","post","type-post","status-publish","format-standard","hentry","category-solved","tag-delay","tag-delphi","tag-multithreading"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Why my Thread run after Form creation? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-why-my-thread-run-after-form-creation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Why my Thread run after Form creation? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] unit AniThread; interface uses Classes, Windows, Controls, Graphics; type TAnimationThread = class(TThread) private { private declarations } FWnd: HWND; FPaintRect: TRect; FbkColor, FfgColor: TColor; FInterval: integer; protected procedure Execute; override; public constructor Create(paintsurface : TWinControl; {Control to paint on } paintrect : TRect; { area for animation bar } bkColor, barcolor : TColor; { ... 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