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//
// Drag & Drop code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2025 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
//
// Note: this file contains platform specific code and will therefore
// not be processed by doxygen (see Doxyfile.in).
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/platform.H>
#include "flstring.h"
#include "drivers/X11/Fl_X11_Screen_Driver.H"
#include "Fl_Window_Driver.H"
extern Atom fl_XdndAware;
extern Atom fl_XdndSelection;
extern Atom fl_XdndEnter;
extern Atom fl_XdndTypeList;
extern Atom fl_XdndPosition;
extern Atom fl_XdndLeave;
extern Atom fl_XdndDrop;
extern Atom fl_XdndStatus;
extern Atom fl_XdndActionCopy;
extern Atom fl_XdndFinished;
extern Atom fl_XdndURIList;
extern Atom fl_XaUtf8String;
extern char fl_i_own_selection[2];
extern char *fl_selection_buffer[2];
extern void fl_sendClientMessage(Window window, Atom message,
unsigned long d0,
unsigned long d1=0,
unsigned long d2=0,
unsigned long d3=0,
unsigned long d4=0);
// return version # of Xdnd this window supports. Also change the
// window to the proxy if it uses a proxy:
static int dnd_aware(Window& window) {
Atom actual; int format; unsigned long count, remaining;
unsigned char *data = 0;
XGetWindowProperty(fl_display, window, fl_XdndAware,
0, 4, False, XA_ATOM,
&actual, &format,
&count, &remaining, &data);
int ret = 0;
if (actual == XA_ATOM && format==32 && count && data)
ret = int(*(Atom*)data);
if (data) { XFree(data); data = 0; }
return ret;
}
static int grabfunc(int event) {
if (event == FL_RELEASE) Fl::pushed(0);
return 0;
}
extern int (*fl_local_grab)(int); // in Fl.cxx
// send an event to an fltk window belonging to this program:
static int local_handle(int event, Fl_Window* window) {
fl_local_grab = 0;
Fl::e_x = Fl::e_x_root-window->x();
Fl::e_y = Fl::e_y_root-window->y();
int ret = Fl::handle(event,window);
fl_local_grab = grabfunc;
return ret;
}
int Fl_X11_Screen_Driver::dnd(int unused) {
Fl_Window *source_fl_win = Fl::first_window();
Fl::first_window()->cursor(FL_CURSOR_MOVE);
Window source_window = fl_xid(Fl::first_window());
fl_local_grab = grabfunc;
Window target_window = 0;
Fl_Window* local_window = 0;
int dndversion = 4; int dest_x, dest_y;
XSetSelectionOwner(fl_display, fl_XdndSelection, source_window, fl_event_time);
while (Fl::pushed()) {
// figure out what window we are pointing at:
Window new_window = 0; int new_version = 0;
Fl_Window* new_local_window = 0;
Window child;
for (child = RootWindow(fl_display, fl_screen);;) {
Window root; unsigned int junk3;
XQueryPointer(fl_display, child, &root, &child,
&Fl::e_x_root, &Fl::e_y_root, &dest_x, &dest_y, &junk3);
if (!child) {
if (!new_window && (new_version = dnd_aware(root))) new_window = root;
break;
}
new_window = child;
if ((new_local_window = fl_find(child))) break;
if ((new_version = dnd_aware(new_window))) break;
}
#if USE_XFT || FLTK_USE_CAIRO
if (new_local_window) {
float s = Fl::screen_driver()->scale(Fl_Window_Driver::driver(new_local_window)->screen_num());
Fl::e_x_root /= s;
Fl::e_y_root /= s;
}
#endif
if (new_window != target_window) {
if (local_window) {
local_handle(FL_DND_LEAVE, local_window);
} else if (dndversion) {
fl_sendClientMessage(target_window, fl_XdndLeave, source_window);
}
dndversion = new_version;
target_window = new_window;
local_window = new_local_window;
if (local_window) {
local_handle(FL_DND_ENTER, local_window);
} else if (dndversion) {
// Send an X-DND message to the target window. In order to
// support dragging of files/URLs as well as arbitrary text,
// we look at the selection buffer - if the buffer starts
// with a common URI scheme, does not contain spaces, and
// contains at least one CR LF, then we flag the data as
// both a URI list (MIME media type "text/uri-list") and
// plain text. Otherwise, we just say it is plain text.
if ((!strncmp(fl_selection_buffer[0], "file:///", 8) ||
!strncmp(fl_selection_buffer[0], "ftp://", 6) ||
!strncmp(fl_selection_buffer[0], "http://", 7) ||
!strncmp(fl_selection_buffer[0], "https://", 8) ||
!strncmp(fl_selection_buffer[0], "ipp://", 6) ||
!strncmp(fl_selection_buffer[0], "ldap:", 5) ||
!strncmp(fl_selection_buffer[0], "mailto:", 7) ||
!strncmp(fl_selection_buffer[0], "news:", 5) ||
!strncmp(fl_selection_buffer[0], "smb://", 6)) &&
!strchr(fl_selection_buffer[0], ' ') &&
strstr(fl_selection_buffer[0], "\r\n")) {
// Send file/URI list...
fl_sendClientMessage(target_window, fl_XdndEnter, source_window, dndversion<<24,
fl_XdndURIList, fl_XaUtf8String, XA_STRING);
} else {
// Send plain text...
fl_sendClientMessage(target_window, fl_XdndEnter, source_window, dndversion<<24,
fl_XaUtf8String, XA_STRING, 0);
}
}
}
if (local_window) {
local_handle(FL_DND_DRAG, local_window);
} else if (dndversion) {
int exroot = Fl::e_x_root, eyroot = Fl::e_y_root;
#if USE_XFT || FLTK_USE_CAIRO
Fl_Window *target = fl_find(target_window);
if (target) {
float s = Fl::screen_driver()->scale(Fl_Window_Driver::driver(target)->screen_num());
exroot *= s; eyroot *= s;
}
#endif
fl_sendClientMessage(target_window, fl_XdndPosition, source_window,
0, (exroot<<16)|eyroot, fl_event_time,
fl_XdndActionCopy);
}
Fl::wait();
}
if (local_window) {
fl_i_own_selection[0] = 1;
if (local_handle(FL_DND_RELEASE, local_window)) Fl::paste(*Fl::belowmouse(), 0);
} else if (dndversion) {
fl_sendClientMessage(target_window, fl_XdndDrop, source_window,
0, fl_event_time);
} else if (target_window) {
// fake a drop by clicking the middle mouse button:
XButtonEvent msg;
msg.type = ButtonPress;
msg.window = target_window;
msg.root = RootWindow(fl_display, fl_screen);
msg.subwindow = 0;
msg.time = fl_event_time+1;
msg.x = dest_x;
msg.y = dest_y;
float s = 1;
#if USE_XFT || FLTK_USE_CAIRO
Fl_Window *target = fl_find(target_window);
if (target) s = Fl::screen_driver()->scale(Fl_Window_Driver::driver(target)->screen_num());
#endif
msg.x_root = Fl::e_x_root * s;
msg.y_root = Fl::e_y_root * s;
msg.state = 0x0;
msg.button = Button2;
XSendEvent(fl_display, target_window, False, 0L, (XEvent*)&msg);
msg.time++;
msg.state = 0x200;
msg.type = ButtonRelease;
XSendEvent(fl_display, target_window, False, 0L, (XEvent*)&msg);
}
fl_local_grab = 0;
Fl::handle(FL_RELEASE, source_fl_win);
source_fl_win->cursor(FL_CURSOR_DEFAULT);
return 1;
}
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