The GtkRadiant sources as originally released under the GPL license.

radiant/gtkdlgs.h

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+/*
+Copyright (c) 2001, Loki software, inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, 
+are permitted provided that the following conditions are met:
+
+Redistributions of source code must retain the above copyright notice, this list 
+of conditions and the following disclaimer.
+
+Redistributions in binary form must reproduce the above copyright notice, this
+list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+Neither the name of Loki software nor the names of its contributors may be used 
+to endorse or promote products derived from this software without specific prior 
+written permission. 
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY 
+DIRECT,INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+*/
+
+#if !defined(INCLUDED_GTKDLGS_H)
+#define INCLUDED_GTKDLGS_H
+
+#include "qerplugin.h"
+
+EMessageBoxReturn DoLightIntensityDlg (int *intensity);
+EMessageBoxReturn DoTextureLayout (float *fx, float *fy);
+void DoTextEditor (const char* filename, int cursorpos);
+
+void DoProjectSettings();
+
+void DoTextureListDlg();
+void DoFind();
+void DoSides(int type, int axis);
+void DoAbout();
+
+
+#ifdef WIN32
+extern bool g_TextEditor_useWin32Editor;
+#else
+#include "string/stringfwd.h"
+extern bool g_TextEditor_useCustomEditor;
+extern CopiedString g_TextEditor_editorCommand;
+#endif
+
+
+#endif