mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
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149 lines
4.2 KiB
ObjectPascal
149 lines
4.2 KiB
ObjectPascal
{
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***************************************************************************
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* *
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* This source is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This code is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License for more details. *
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* *
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* A copy of the GNU General Public License is available on the World *
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* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
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* obtain it by writing to the Free Software Foundation, *
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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* *
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***************************************************************************
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}
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unit gtkglarea;
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{$MODE objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, VCLGlobals, LCLLinux, glib, gdk, gtk, gtkglarea_int, gl,
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Controls, gtkint, gtkwinapiwindow, LMessages;
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type
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TCustomGTKGLAreaControl = class(TWinControl)
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protected
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function GetWidget: PGtkGLArea;
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procedure CreateWnd; override;
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procedure AttachSignals; override;
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public
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property Widget: PGtkGLArea read GetWidget;
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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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TGTKGLAreaControl = class(TCustomGTKGLAreaControl)
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published
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end;
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implementation
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{ TCustomGTKGLArea }
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const
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InitAttrList: array [1..11] of LongInt=
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( GDK_GL_RGBA,
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GDK_GL_RED_SIZE, 1,
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GDK_GL_GREEN_SIZE, 1,
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GDK_GL_BLUE_SIZE, 1,
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GDK_GL_DEPTH_SIZE,1,
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GDK_GL_DOUBLEBUFFER,
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GDK_GL_None
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);
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constructor TCustomGTKGLAreaControl.Create(AOwner: TComponent);
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begin
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inherited Create(AOwner);
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SetBounds(1, 1, 75, 25);
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end;
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destructor TCustomGTKGLAreaControl.Destroy;
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begin
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inherited Destroy;
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end;
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function TCustomGTKGLAreaControl.GetWidget: PGtkGLArea;
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begin
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if HandleAllocated then
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Result:=PGtkGLArea(Handle)
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else
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Result:=nil;
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end;
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procedure TCustomGTKGLAreaControl.CreateWnd;
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var
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Params: TCreateParams;
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begin
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CreateParams(Params);
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with Params do begin
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if (WndParent = 0) and (Style and WS_CHILD <> 0) then exit;
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end;
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Handle := longint(gtk_gl_area_new(pgint(@InitAttrList)));
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if Widget <> nil then begin
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gtk_object_set_data(pgtkobject(Widget),'Sender',Self);
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gtk_object_set_data(pgtkobject(Widget), 'Class', Pointer(Self));
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gtk_object_set_data(pgtkObject(Widget),'Style',0);
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gtk_object_set_data(pgtkObject(Widget),'ExStyle',0);
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end else begin
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writeln('Creation of gtkglarea failed.');
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Halt(1);
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end;
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if Parent <> nil then AddControl;
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AttachSignals;
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InitializeWnd;
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end;
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procedure TCustomGTKGLAreaControl.AttachSignals;
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begin
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// Attach callbacks
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SetCallback(LM_DESTROY);
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SetCallback(LM_SHOWWINDOW);
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SetCallback(LM_FOCUS);
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SetCallback(LM_WINDOWPOSCHANGED);
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SetCallback(LM_PAINT);
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SetCallback(LM_EXPOSEEVENT);
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SetCallback(LM_KEYDOWN);
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SetCallback(LM_KEYUP);
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SetCallback(LM_CHAR);
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SetCallback(LM_MOUSEMOVE);
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SetCallback(LM_LBUTTONDOWN);
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SetCallback(LM_LBUTTONUP);
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SetCallback(LM_RBUTTONDOWN);
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SetCallback(LM_RBUTTONUP);
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SetCallback(LM_MBUTTONDOWN);
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SetCallback(LM_MBUTTONUP);
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SetCallback(LM_MOUSEWHEEL);
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end;
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//-----------------------------------------------------------------------------
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procedure InternalInit;
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begin
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(* OpenGL functions can be called only if make_current returns true *)
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if not InitGl then begin
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WriteLn('OpenGL is not supported on this system');
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Halt(2);
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end;
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end;
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initialization
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InternalInit;
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finalization
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end.
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