file_chooser.cxx

来自「SRI international 发布的OAA框架软件」· CXX 代码 · 共 343 行

//
// "$Id: file_chooser.cxx,v 1.1.1.1 2003/06/03 22:25:47 agno Exp $"
//
// File chooser test program.
//
// Copyright 1999-2003 by Michael Sweet.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "[e-mail]".
//
// Contents:
//
//   main()           - Create a file chooser and wait for a selection to
//                      be made.
//   close_callback() - Close the main window...
//   fc_callback()    - Handle choices in the file chooser...
//   pdf_check()      - Check for and load the first page of a PDF file.
//   ps_check()       - Check for and load the first page of a PostScript
//                      file.
//   show_callback()  - Show the file chooser...
//

//
// Include necessary headers...
//

#include <stdio.h>
#include <FL/Fl_File_Chooser.H>
#include <FL/Fl_File_Icon.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_PNM_Image.H>
#include <FL/Fl_Light_Button.H>
#include "../src/flstring.h"


//
// Globals...
//

Fl_Input		*filter;
Fl_File_Browser		*files;
Fl_File_Chooser		*fc;
Fl_Shared_Image		*image = 0;


//
// Functions...
//

void		close_callback(void);
void		create_callback(void);
void		dir_callback(void);
void		fc_callback(Fl_File_Chooser *, void *);
void		multi_callback(void);
Fl_Image	*pdf_check(const char *, uchar *, int);
Fl_Image	*ps_check(const char *, uchar *, int);
void		show_callback(void);


//
// 'main()' - Create a file chooser and wait for a selection to be made.
//

int			// O - Exit status
main(int  argc,		// I - Number of command-line arguments
     char *argv[])	// I - Command-line arguments
{
  Fl_Window	*window;// Main window
  Fl_Button	*button;// Buttons
  Fl_File_Icon	*icon;	// New file icon


  // Make the file chooser...
  Fl::scheme(NULL);
  Fl_File_Icon::load_system_icons();

  fc = new Fl_File_Chooser(".", "*", Fl_File_Chooser::SINGLE, "Fl_File_Chooser Test");
  fc->callback(fc_callback);

  // Register the PS and PDF image types...
  Fl_Shared_Image::add_handler(pdf_check);
  Fl_Shared_Image::add_handler(ps_check);

  // Make the main window...
  window = new Fl_Window(400, 200, "File Chooser Test");

  filter = new Fl_Input(50, 10, 315, 25, "Filter:");
  if (argc > 1)
    filter->value(argv[1]);
  else
    filter->value("PDF Files (*.pdf)\t"
                  "PostScript Files (*.ps)\t"
		  "Image Files (*.{bmp,gif,jpg,png})\t"
		  "C/C++ Source Files (*.{c,C,cc,cpp,cxx})");

  button = new Fl_Button(365, 10, 25, 25);
  button->labelcolor(FL_YELLOW);
  button->callback((Fl_Callback *)show_callback);

  icon   = Fl_File_Icon::find(".", Fl_File_Icon::DIRECTORY);
  icon->label(button);

  button = new Fl_Light_Button(50, 45, 80, 25, "MULTI");
  button->callback((Fl_Callback *)multi_callback);

  button = new Fl_Light_Button(140, 45, 90, 25, "CREATE");
  button->callback((Fl_Callback *)create_callback);

  button = new Fl_Light_Button(240, 45, 115, 25, "DIRECTORY");
  button->callback((Fl_Callback *)dir_callback);

  files = new Fl_File_Browser(50, 80, 340, 75, "Files:");
  files->align(FL_ALIGN_LEFT);

  button = new Fl_Button(340, 165, 50, 25, "Close");
  button->callback((Fl_Callback *)close_callback);

  window->resizable(files);
  window->end();
  window->show();

  Fl::run();

  return (0);
}


//
// 'close_callback()' - Close the main window...
//

void
close_callback(void)
{
  exit(0);
}


//
// 'create_callback()' - Handle clicks on the create button.
//

void
create_callback(void)
{
  fc->type(fc->type() ^ Fl_File_Chooser::CREATE);
}


//
// 'dir_callback()' - Handle clicks on the directory button.
//

void
dir_callback(void)
{
  fc->type(fc->type() ^ Fl_File_Chooser::DIRECTORY);
}


//
// 'fc_callback()' - Handle choices in the file chooser...
//

void
fc_callback(Fl_File_Chooser *fc,	// I - File chooser
            void            *data)	// I - Data
{
  const char		*filename;	// Current filename


  printf("fc_callback(fc = %p, data = %p)\n", fc, data);

  filename = fc->value();

  printf("    filename = \"%s\"\n", filename ? filename : "(null)");
}


//
// 'multi_callback()' - Handle clicks on the multi button.
//

void
multi_callback(void)
{
  fc->type(fc->type() ^ Fl_File_Chooser::MULTI);
}


//
// 'pdf_check()' - Check for and load the first page of a PDF file.
//

Fl_Image *			// O - Page image or NULL
pdf_check(const char *name,	// I - Name of file
          uchar      *header,	// I - Header data
	  int        headerlen)	// I - Length of header data
{
  const char	*home;		// Home directory
  char		preview[1024],	// Preview filename
		command[1024];	// Command


  if (memcmp(header, "%PDF", 4) != 0)
    return 0;

  home = getenv("HOME");
  snprintf(preview, sizeof(preview), "%s/.preview.ppm", home ? home : "");

  snprintf(command, sizeof(command),
           "gs -r100 -dFIXED -sDEVICE=ppmraw -dQUIET -dNOPAUSE -dBATCH "
	   "-sstdout=\"%%stderr\" -sOUTPUTFILE=\'%s\' "
	   "-dFirstPage=1 -dLastPage=1 \'%s\' 2>/dev/null", preview, name);

  if (system(command)) return 0;

  return new Fl_PNM_Image(preview);
}


//
// 'ps_check()' - Check for and load the first page of a PostScript file.
//

Fl_Image *			// O - Page image or NULL
ps_check(const char *name,	// I - Name of file
         uchar      *header,	// I - Header data
	 int        headerlen)	// I - Length of header data
{
  const char	*home;		// Home directory
  char		preview[1024],	// Preview filename
		outname[1024],	// Preview PS file
		command[1024];	// Command
  FILE		*in,		// Input file
		*out;		// Output file
  int		page;		// Current page
  char		line[256];	// Line from file


  if (memcmp(header, "%!", 2) != 0)
    return 0;

  home = getenv("HOME");
  snprintf(preview, sizeof(preview), "%s/.preview.ppm", home ? home : "");

  if (memcmp(header, "%!PS", 4) == 0) {
    // PS file has DSC comments; extract the first page...
    snprintf(outname, sizeof(outname), "%s/.preview.ps", home ? home : "");

    if (strcmp(name, outname) != 0) {
      in   = fopen(name, "rb");
      out  = fopen(outname, "wb");
      page = 0;

      while (fgets(line, sizeof(line), in) != NULL) {
	if (strncmp(line, "%%Page:", 7) == 0) {
          page ++;
	  if (page > 1) break;
	}

	fputs(line, out);
      }

      fclose(in);
      fclose(out);
    }
  } else {
    // PS file doesn't have DSC comments; do the whole file...
    strlcpy(outname, name, sizeof(outname));
  }

  snprintf(command, sizeof(command),
           "gs -r100 -dFIXED -sDEVICE=ppmraw -dQUIET -dNOPAUSE -dBATCH "
	   "-sstdout=\"%%stderr\" -sOUTPUTFILE=\'%s\' \'%s\' 2>/dev/null",
	   preview, outname);

  if (system(command)) return 0;

  return new Fl_PNM_Image(preview);
}


//
// 'show_callback()' - Show the file chooser...
//

void
show_callback(void)
{
  int	i;			// Looping var
  int	count;			// Number of files selected
  char	relative[1024];		// Relative filename


  fc->show();
  if (filter->value()[0])
    fc->filter(filter->value());

  fc->show();

  while (fc->visible())
    Fl::wait();

  count = fc->count();
  if (count > 0)
  {
    files->clear();

    for (i = 1; i <= count; i ++)
    {
      if (!fc->value(i))
        break;

      fl_filename_relative(relative, sizeof(relative), fc->value(i));

      files->add(relative,
                 Fl_File_Icon::find(fc->value(i), Fl_File_Icon::PLAIN));
    }

    files->redraw();
  }
}


//
// End of "$Id: file_chooser.cxx,v 1.1.1.1 2003/06/03 22:25:47 agno Exp $".
//