ede/eimage/eimage.cpp

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#include <Fl/Fl.h>
#include <Fl/Fl_Window.h>
#include <Fl/Fl_Button.h>
#include <Fl/Fl_Shared_Image.h>
#include <Fl/Fl_Scroll.h>
#include <Fl/Fl_Widget.h>
#include <Fl/Fl_File_Chooser.h>
#include <Fl/filename.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <sys/stat.h>
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#define DEBUG 1
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// Supported image types
const char* supported[] = {"bm","bmp","gif","jpg","pbm","pgm","png","ppm","xbm","xpm",0};
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// Global variables used everywhere
char filename[FL_PATH_MAX], directory[FL_PATH_MAX];
Fl_Window* w;
float zoomfactor;
bool autozoom=false;
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Fl_Shared_Image *im;
class ScrolledImage;
ScrolledImage* s;
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// Directory list cache used in prevnext()
dirent **files;
int nfiles;
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// Forward declaration of funcs for use from callbacks
void nextpic();
void prevpic();
void loadimage();
void newdir();
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// Callbacks for main menu
void next_cb(Fl_Widget*,void*) { nextpic(); }
void prev_cb(Fl_Widget*,void*) { prevpic(); }
void open_cb(Fl_Widget*,void*) {
// construct filename filter
char filter[FL_PATH_MAX];
snprintf(filter, FL_PATH_MAX, "Image files(*.{%s", supported[0]);
for (int i=1; supported[i]; i++)
snprintf(filter, FL_PATH_MAX, "%s,%s", filter, supported[i]);
snprintf(filter, FL_PATH_MAX, "%s})", filter);
const char* f = fl_file_chooser("Choose image or directory",filter,directory);
if (!f) return;
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strncpy(filename,f,FL_PATH_MAX);
newdir();
loadimage();
}
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void manage_cb(Fl_Widget* b,void*) {} // call file manager
void fullscreen_cb(Fl_Widget* b,void*) {
static bool isfull=false;
static int X,Y,W,H;
if (isfull) {
w->fullscreen_off(X,Y,W,H);
isfull=false;
} else {
X=w->x(); Y=w->y(); W=w->w(); H=w->h();
w->fullscreen();
isfull=true;
}
}
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void zoomin_cb(Fl_Widget* b,void*) {
if (zoomfactor>=1) zoomfactor += 0.2; else zoomfactor += zoomfactor/5;
autozoom=false;
loadimage();
}
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void zoomout_cb(Fl_Widget* b,void*) {
if (zoomfactor>=1) zoomfactor -= 0.2; else zoomfactor -= zoomfactor/5;
autozoom=false;
loadimage();
}
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void zoomrestore_cb(Fl_Widget* b,void*) { zoomfactor = 1; autozoom=false; loadimage(); }
void zoomauto_cb(Fl_Widget *b,void*) { autozoom = !autozoom; loadimage(); }
void about_cb(Fl_Widget* b,void*) {} // about window
void exit_cb(Fl_Widget* b,void*) { exit(0); }
// Main popup menu
Fl_Menu_Item mainmenu[] = {
{"&Open", FL_CTRL+'o', open_cb},
{"&Manage", 0, manage_cb, 0, FL_MENU_DIVIDER},
{"&Previous", FL_Page_Up, prev_cb},
{"&Next", FL_Page_Down, next_cb, 0, FL_MENU_DIVIDER},
{"&Zoom in", '+', zoomin_cb},
{"Zoom &out", '-', zoomout_cb},
{"Zoom &auto", FL_CTRL+'a', zoomauto_cb},
{"&Restore", '/', zoomrestore_cb, 0, FL_MENU_DIVIDER},
{"&Fullscreen", FL_F+11, fullscreen_cb, 0, FL_MENU_DIVIDER},
{"A&bout", 0, about_cb},
{"&Exit", FL_Escape, exit_cb},
{0}
};
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class ScrolledImage : public Fl_Scroll {
private:
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Fl_Box* b;
Fl_Menu_Button* mb;
public:
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ScrolledImage(int x, int y, int w, int h, const char*l = 0)
: Fl_Scroll(x,y,w,h,l) {
align(FL_ALIGN_INSIDE|FL_ALIGN_CENTER);
begin();
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b = new Fl_Box(w/2,h/2,0,0);
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mb = new Fl_Menu_Button (0,0,0,0,"");
mb->type(Fl_Menu_Button::POPUP3);
mb->menu(0);
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end();
redraw();
}
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void image(Fl_Image* a) { b->image(a); }
void image(Fl_Image& a) { b->image(a); }
Fl_Image* image() { return b->image(); }
void label(const char* a) {
if (a) resizebox(0,0); // center label
b->label(a);
}
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// Resize the box containing image
void resizebox(int W, int H) {
int X=0,Y=0;
int aw = w()-scrollbar.w(); int ah=h()-hscrollbar.h();
if(aw>W) X=(aw-W)/2;
if(ah>H) Y=(ah-H)/2;
b->resize(X,Y,W,H);
}
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void resize(int x,int y,int w,int h) {
Fl_Scroll::resize(x,y,w,h);
resizebox(b->w(),b->h()); // refresh image position
redraw();
}
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virtual int handle(int event) {
if (event == FL_PUSH) {
if(Fl::event_button()==3 && mb->menu()!=0) {
mb->popup();
return 1;
}
}
// sometimes PgUp and PgDown aren't handled
else if (event == FL_SHORTCUT && mb->menu()!=0) {
int key = Fl::event_key();
if (key==FL_Page_Up || key==FL_Page_Down)
return mb->handle(event);
}
return Fl_Scroll::handle(event);
}
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void setmenu(Fl_Menu_Item* menu) {
if (menu!=0) {
mb->menu(menu);
}
}
};
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// Directory changed, get new directory from filename
void newdir() {
int p=0;
for (int i=0; i<strlen(filename); i++)
if (filename[i] == '/') p=i;
// There must be at least one '/'
strncpy(directory, filename, p);
directory[p]='\0';
// make prevnext() reread directory
nfiles=0;
}
// Load the image given in char[] filename
void loadimage() {
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char tmp[FL_PATH_MAX]; // the string buffer
if (DEBUG) fprintf(stderr, "Loadimage() - file: %s\n",filename);
// Load image
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if (im) { im->release(); im=0; }
im = Fl_Shared_Image::get(filename); // image type is autodetected now
if (!im) {
if (DEBUG) fprintf(stderr, "Fl_Shared_Image::get() failed!\n");
s->image(0);
snprintf(tmp, FL_PATH_MAX, "Can't load image %s\n",filename);
s->label(strdup(tmp));
s->redraw();
return;
}
// Measure image
int realw=im->w(), realh=im->h();
int scaledw,scaledh;
if (autozoom) {
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// Adjust zoom factor so picture fits inside window
// When user switches to manual zooming, this factor will remain
float fw=(float)s->w()/realw; float fh=(float)s->h()/realh;
if (fw < fh) zoomfactor=fw; else zoomfactor=fh;
}
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// Resample image to new size
scaledw=realw*zoomfactor;
scaledh=realh*zoomfactor;
if (zoomfactor!=1) {
Fl_Image *temp = im->copy(scaledw,scaledh);
im = (Fl_Shared_Image*) temp;
}
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// Set image
s->resizebox(scaledw,scaledh);
s->image(im);
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s->label(0); // clear any previous labels
s->redraw();
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// set window title
if (zoomfactor==1)
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snprintf(tmp,FL_PATH_MAX,"%s (%dx%d) - View picture",fl_filename_name(filename),realw,realh);
else
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snprintf(tmp,FL_PATH_MAX,"%s (%dx%d) - zoom %1.1fx - View picture",fl_filename_name(filename),realw,realh,zoomfactor);
w->label(strdup(tmp));
}
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// Get next/previous picture file in directory
// (universal func. to be called from nextpic() and prevpic() )
void prevnext(int direction) {
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char tmp[FL_PATH_MAX]; // the string buffer
if (DEBUG)
fprintf(stderr, "Prevnext() - file: %s dir: %s direction: %d\n",filename,directory,direction);
if (nfiles == 0) { // read directory
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nfiles = fl_filename_list(directory,&files);
}
// Select next picture after current
bool found=false;
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if (filename[0]) {
const char* justname = fl_filename_name(filename);
// this basically means: if direction is 1 go from first to last, else from last to first
for (int i=(direction?0:nfiles-1); (direction?i<nfiles:i>=0); i+=(direction?1:-1)) {
if (strncmp(justname,files[i]->d_name,FL_PATH_MAX) == 0) {
found=true;
continue; // skip to next file
}
if (found) {
for (int j=0; supported[j]; j++) {
snprintf(tmp,FL_PATH_MAX,"*.%s",supported[j]);
if (fl_filename_match(files[i]->d_name,tmp)) {
snprintf(filename,FL_PATH_MAX,"%s/%s",directory,files[i]->d_name);
loadimage();
return;
}
}
}
}
}
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if (found) { //this means that the current picture is the last/first in directory
if (im) { im->release(); im=0; }
s->image(0);
filename[0]=0;
if (direction)
s->label("This was the last picture.\nPress 'Next' again for first one.");
else
s->label("This was the first picture.\nPress 'Previous' again for last one.");
s->redraw();
return;
} else {
// Just give first (or last) picture in directory
for (int i=(direction?0:nfiles-1); (direction?i<nfiles:i>=0); i+=(direction?1:-1)) {
for (int j=0; supported[j]; j++) {
snprintf(tmp,FL_PATH_MAX,"*.%s",supported[j]);
if (fl_filename_match(files[i]->d_name,tmp)) {
snprintf(filename,FL_PATH_MAX,"%s/%s",directory,files[i]->d_name);
loadimage();
return;
}
}
}
}
// Nothing found...
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if (DEBUG) fprintf(stderr, "Nextpic() - nothing found\n");
if (im) { im->release(); im=0; }
s->image(0);
filename[0]=0;
snprintf(tmp,FL_PATH_MAX,"No pictures in directory %s",directory);
s->label(strdup(tmp));
s->redraw();
// Window title
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snprintf(tmp,FL_PATH_MAX,"View picture - nothing found in %s",directory);
w->label(strdup(tmp));
}
void nextpic() { prevnext(1); }
void prevpic() { prevnext(0); }
int main (int argc, char **argv) {
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filename[0]='\0'; directory[0]='\0'; zoomfactor=1; im=0;
fl_register_images();
// Main window
w = new Fl_Window(200, 200, "View picture");
s = new ScrolledImage(0,0,200,200);
s->color(33);
s->labelcolor(FL_WHITE);
s->setmenu(mainmenu);
w->resizable(s);
w->end();
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w->align(FL_ALIGN_INSIDE|FL_ALIGN_CENTER);
// Analyze command line
if (argc==1) { // No params
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strncpy (directory, getenv("HOME"), FL_PATH_MAX);
nextpic();
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} else if (fl_filename_isdir(argv[1])) { // Param is directory
strncpy (directory, argv[1], FL_PATH_MAX);
nextpic();
argc--; argv++; // ignore this param and forward rest to fltk
} else { // Param is file
if (argv[1][0] == '~' && argv[1][1] == '/') // expand home dir
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snprintf (filename, FL_PATH_MAX, "%s/%s", getenv("HOME"), argv[1]+2);
else if (argv[1][0] != '/') // relative filename
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snprintf (filename, FL_PATH_MAX, "%s/%s", getenv("PWD"), argv[1]);
else // absolute filename
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strncpy (filename, argv[1], FL_PATH_MAX);
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struct stat last_stat; // Does file exist?
if (stat(argv[0], &last_stat)!=0) {
char tmp[FL_PATH_MAX];
snprintf(tmp,FL_PATH_MAX,"File not found - %s",filename);
s->label(tmp);
} else
loadimage();
newdir(); // rebuild char[] directory
argc--; argv++; // ignore this param and forward rest to fltk
}
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// Resize window to image size or screen
int W,H;
if (im->w()>Fl::w()) W=Fl::w(); else W=im->w();
if (im->h()>Fl::h()) H=Fl::h(); else H=im->h();
w->resize(0,0,W,H);
// Window manager should make sure that window is fully visible
w->show(argc,argv);
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return Fl::run();
}