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//
// "Print Window" functions for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2022 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
// Notes: This function must be activated by defining the preprocessor macro
// USE_PRINT_BUTTON on the commandline.
//
// Although this function is compiled on all platforms it is only used by
// platform specific code of fl_open_display() on Linux (X11) and Windows.
// macOS uses the "Print front window" menu in the application menu.
//
// The environment variable FLTK_PRINT_BUTTON can be defined to control the
// creation of the sometimes annoying print button feature at runtime if it
// has been compiled in (see above):
//
// - FLTK_PRINT_BUTTON undefined: like 1 below (default)
//
// - FLTK_PRINT_BUTTON = 0 : print front window disabled for this program
// - FLTK_PRINT_BUTTON = 1 : window shown at startup
// - FLTK_PRINT_BUTTON = 2 : window not shown, shortcut available to show
// - FLTK_PRINT_BUTTON = 3 : window shown at startup, shortcut available
//
// If options 2 or 3 are used the shortcut can be used to show the window
// if it was not shown (2) or accidentally closed (3).
//
// Currently the shortcut can't be configured and is always ALT+SHIFT+'s'.
// Todo: make the shortcut configurable.
#include "print_button.h"
#include <FL/Fl_Printer.H>
#include <FL/Fl_PostScript.H>
#include <FL/Fl_Copy_Surface.H>
#ifdef USE_PRINT_BUTTON
#include <FL/Fl_Button.H>
#include <FL/Fl_Check_Button.H>
#include <FL/fl_draw.H>
#include <FL/fl_ask.H>
#include <stdlib.h>
#include <stdio.h>
// define the optional rotation of print output in degrees to test it
// #define ROTATE 20.0
// Global variables to simplify and clarify the code:
static Fl_Window *print_window = 0; // "print front window" dialog window
static Fl_Check_Button *deco_button = 0; // window decoration button
// The button callback does the job for both printing and copying to the
// clipboard. The callback is called with 'mode' == (int)(data).
// 1: print window
// 2: copy window to clipboard
// else: see 2.
static void output_cb(Fl_Widget * /*unused*/, void *data) {
print_window->hide();
Fl_Window *win = Fl::first_window();
// if no (other) window exists we return silently w/o showing the
// print window again (which ends the program)
if (!win) return;
fl_print_or_copy_window(win, deco_button->value(), fl_int(data));
print_window->show();
}
// Global event handler for screenshot (ctrl/alt/command + s)
// This pops up the "Print front window" dialog if it had been closed
static int shortcut_handler(int event) { // global shortcut handler
// required key and keyboard states for shortcut
// (should be configurable)
const int key = 's'; // global shortcut key
const int state = FL_ALT | FL_SHIFT; // | FL_CTRL | FL_COMMAND;
if (print_window &&
(event == FL_SHORTCUT || event == FL_KEYBOARD) &&
((Fl::event_state() & state) == state) &&
(Fl::event_key() == key)) {
print_window->show();
return 1;
}
return 0;
}
// create and initialize the "Print/copy front window" dialog window
int fl_create_print_window() {
static int first = 1;
if (!first)
return 0;
first = 0;
int val = 1;
const char *print_button = fl_getenv("FLTK_PRINT_BUTTON");
if (print_button)
val = atoi(print_button);
if (val) {
// prevent becoming a subwindow
Fl_Group *cg = Fl_Group::current();
Fl_Group::current(0);
print_window = new Fl_Window( 0, 0, 200, 110, "FLTK screenshot");
Fl_Button *bp = new Fl_Button(10, 10, 180, 30, "Print front window");
Fl_Button *bc = new Fl_Button(10, 40, 180, 30, "Copy front window");
deco_button = new Fl_Check_Button(10, 70, 180, 30, "Window decoration");
bp->callback(output_cb, (void *)1);
bc->callback(output_cb, (void *)2);
print_window->end();
if (val & 1)
print_window->show();
// reset saved current group
Fl_Group::current(cg);
if (val & 2)
Fl::add_handler(shortcut_handler);
}
return 1;
}
#else // USE_PRINT_BUTTON not defined
int fl_create_print_window() {
return 0;
}
#endif // USE_PRINT_BUTTON
/* undocumented function:
Print a window or copy its contents to the clipboard.
win The window to process
grab_decoration true means the window titlebar is processed too
mode 1 means print, other means copy
*/
int fl_print_or_copy_window(Fl_Window *win, bool grab_decoration, int mode) {
if (!win) return 0;
int ww = grab_decoration ? win->decorated_w() : win->w();
int wh = grab_decoration ? win->decorated_h() : win->h();
if (mode == 1) { // print window
// exchange the 2 constructors below to test class Fl_PostScript_File_Device
Fl_Printer printer;
//Fl_PostScript_File_Device printer;
int w, h;
if (printer.begin_job(1)) { // fail or cancel
return 1;
}
if (printer.begin_page()) { // fail or cancel
return 1;
}
printer.printable_rect(&w, &h);
// scale the printer device so that the window fits on the page
float scale = 1;
if (ww > w || wh > h) {
scale = (float)w / ww;
if ((float)h / wh < scale)
scale = (float)h / wh;
printer.scale(scale, scale);
printer.printable_rect(&w, &h);
}
#ifdef ROTATE
printer.scale(scale * 0.8, scale * 0.8);
printer.printable_rect(&w, &h);
printer.origin(w / 2, h / 2);
printer.rotate(ROTATE);
printer.print_widget(win, -win->w() / 2, -win->h() / 2);
#else
printer.origin(w / 2, h / 2);
if (grab_decoration) printer.draw_decorated_window(win, -ww / 2, -wh / 2);
else printer.draw(win, -ww / 2, -wh / 2);
#endif
printer.end_page();
printer.end_job();
} else { // copy window to clipboard
Fl_Copy_Surface *surf = new Fl_Copy_Surface(ww, wh);
if (grab_decoration)
surf->draw_decorated_window(win); // draw the window content
else
surf->draw(win); // draw the window content
delete surf; // put the window on the clipboard
} // print | copy
return 0;
}