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Fix X11 copy-paste and drag-and-drop target selection (#182)

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Select the "best" target rather than a random one out of a list of
suitable targets. The old target selection algorithm would sometimes
select the wrong target and hence retrieve unexpected data.

This could happen in both copy-paste and drag-and-drop operations.

Note: backported to 1.3.6 (git current) as well
      (commit 7ce6d2cf5d).

Closes #182.
This commit is contained in:
Albrecht Schlosser 2021-01-29 00:06:34 +01:00
parent ed5854d65a
commit ff0543524b
3 changed files with 153 additions and 112 deletions
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2
CHANGES.txt
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@ -127,6 +127,8 @@ Changes in FLTK 1.4.0 Released: ??? ?? 2021
Other Improvements
- (add new items here)
- Fixed X11 copy-paste and drag-and-drop target selection (issue #182).
This fix has been backported to 1.3.6 as well.
- Added support for macOS 11.0 "Big Sur" and for building for
the arm64 architecture.
- Add optional argument to Fl_Printer::begin_job() to receive

228
src/Fl_x.cxx
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@ -1,7 +1,7 @@
//
// X specific code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2020 by Bill Spitzak and others.
// Copyright 1998-2021 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
@ -344,7 +344,6 @@ Atom fl_XdndDrop;
Atom fl_XdndStatus;
Atom fl_XdndActionCopy;
Atom fl_XdndFinished;
//Atom fl_XdndProxy;
Atom fl_XdndURIList;
static Atom fl_Xatextplainutf;
static Atom fl_Xatextplainutf2; // STR#2930
@ -367,6 +366,98 @@ Atom fl_NET_WORKAREA;
static Atom fl_NET_WM_ICON;
static Atom fl_NET_ACTIVE_WINDOW;
/*
Debug: translate Atom (number) to name: enable (1) if used below
*/
#if (0)
static void debug_atom_name(const char *fun, int line, Atom atom) {
char *name = XGetAtomName(fl_display, atom);
fprintf(stderr, "[%s:%d] debug_atom_name (%4lu) = %s\n", fun, line, atom, name);
XFree(name);
}
#endif
/*
Find the best target in a list of available copy/paste or dnd targets.
This function searches all available targets [avail, na] by comparing
these with an ordered list of suitable targets [targets, nt].
The size of the list of available targets is determined by 'na'.
The list of suitable targets must be ordered by preference with the
best target first. This ensures that we always find our preferred
target, no matter how the list of available targets is ordered.
The list size is max. 'nt' entries but can also be terminated
by a zero (0) entry.
The list of suitable targets is provided by FLTK (see below); the
list of available targets is provided by the data source program.
Returns: (Atom) the "best target" or 0 (zero) if no target matches.
*/
static Atom find_target(Atom *targets, int nt, Atom *avail, int na) {
Atom retval = 0;
Atom mt, at;
int i = 0, m = 0;
#if (0) // Debug
fprintf(stderr, "find_target: looking for:\n");
for (i = 0; i < nt; i++)
debug_atom_name(" find_target", i, targets[i]);
for (i = 0; i < na; i++)
debug_atom_name(" available ", i, avail[i]);
#endif // Debug
int n = nt;
for (i = 0; i < na; i++) { // search all available targets
at = avail[i];
// search only *better* targets: m < n !
for (m = 0; m < n; m++) { // try to match usable targets
mt = targets[m];
if (!mt) break; // end of list
if (mt == at) {
n = m;
retval = mt;
break;
}
}
if (n == 0) break; // found the *best* target (0)
}
// debug_atom_name("find_target: FOUND", n, retval);
return retval;
}
/*
Find a suitable target for text insertion in a list of available targets.
*/
static Atom find_target_text(Atom *avail, int na) {
static Atom text_targets[] = {
fl_XaUtf8String, // "UTF8_STRING"
fl_Xatextplainutf2, // "text/plain;charset=utf-8" (correct: lowercase)
fl_Xatextplainutf, // "text/plain;charset=UTF-8" (non-standard: compat.)
fl_Xatextplain, // "text/plain"
XA_STRING, // "STRING"
fl_XaText, // "TEXT"
fl_XaCompoundText, // "COMPOUND_TEXT"
fl_XaTextUriList, // "text/uri-list" (e.g. file manager)
(Atom)0 // list terminator (optional, but don't remove)
};
static int nt = sizeof(text_targets) / sizeof(Atom) - 1; // list size w/o terminator
return find_target(text_targets, nt, avail, na);
}
/*
Find a suitable target for image insertion in a list of available targets.
*/
static Atom find_target_image(Atom *avail, int na) {
static Atom image_targets[] = {
fl_XaImageBmp, // "image/bmp"
fl_XaImagePNG, // "image/png"
(Atom)0 // list terminator (optional, but don't remove)
};
static int ni = sizeof(image_targets) / sizeof(Atom) - 1; // list size w/o terminator
return find_target(image_targets, ni, avail, na);
}
/*
X defines 32-bit-entities to have a format value of max. 32,
although sizeof(atom) can be 8 (64 bits) on a 64-bit OS.
@ -645,7 +736,6 @@ void open_display_i(Display* d) {
fl_XdndStatus = XInternAtom(d, "XdndStatus", 0);
fl_XdndActionCopy = XInternAtom(d, "XdndActionCopy", 0);
fl_XdndFinished = XInternAtom(d, "XdndFinished", 0);
//fl_XdndProxy = XInternAtom(d, "XdndProxy", 0);
fl_XdndEnter = XInternAtom(d, "XdndEnter", 0);
fl_XdndURIList = XInternAtom(d, "text/uri-list", 0);
fl_Xatextplainutf = XInternAtom(d, "text/plain;charset=UTF-8",0);
@ -839,31 +929,13 @@ int Fl_X11_System_Driver::clipboard_contains(const char *type)
0, 4000, 0, 0,
&actual, &format, &count, &remaining, &portion);
if (actual != XA_ATOM) return 0;
Atom t;
int retval = 0;
if (strcmp(type, Fl::clipboard_plain_text) == 0) {
for (i = 0; i<count; i++) { // searching for text data
t = ((Atom*)portion)[i];
if (t == fl_Xatextplainutf ||
t == fl_Xatextplainutf2 ||
t == fl_Xatextplain ||
t == fl_XaUtf8String) {
retval = 1;
break;
}
}
}
else if (strcmp(type, Fl::clipboard_image) == 0) {
for (i = 0; i<count; i++) { // searching for image data
t = ((Atom*)portion)[i];
if (t == fl_XaImageBmp || t == fl_XaImagePNG) {
retval = 1;
break;
}
}
}
Atom t = (Atom)0;
if (strcmp(type, Fl::clipboard_plain_text) == 0)
t = find_target_text((Atom*)portion, count);
else if (strcmp(type, Fl::clipboard_image) == 0)
t = find_target_image((Atom*)portion, count);
XFree(portion);
return retval;
return (t ? 1 : 0);
}
static Window fl_dnd_source_window;
@ -1417,7 +1489,6 @@ int fl_handle(const XEvent& thisevent)
case SelectionNotify: {
static unsigned char* sn_buffer = 0;
//static const char *buffer_format = 0;
if (sn_buffer) {XFree(sn_buffer); sn_buffer = 0;}
long bytesread = 0;
if (fl_xevent->xselection.property) for (;;) {
@ -1447,56 +1518,35 @@ int fl_handle(const XEvent& thisevent)
}
if (actual == TARGETS || actual == XA_ATOM) {
/*for (unsigned i = 0; i<count; i++) {
fprintf(stderr," %s", XGetAtomName(fl_display, ((Atom*)portion)[i]) );
}
fprintf(stderr,"\n");
*/
Atom t, type = XA_STRING;
Atom type;
if (Fl::e_clipboard_type == Fl::clipboard_image) { // searching for image data
for (unsigned i = 0; i<count; i++) {
t = ((Atom*)portion)[i];
if (t == fl_XaImageBmp || t == fl_XaImagePNG) {
type = t;
goto found;
type = find_target_image((Atom *)portion, count);
}
else { // searching for text data. *FIXME* - there may be other data types!
type = find_target_text((Atom *)portion, count);
}
XFree(portion);
return true;
}
for (unsigned i = 0; i<count; i++) { // searching for text data
t = ((Atom*)portion)[i];
if (t == fl_Xatextplainutf ||
t == fl_Xatextplainutf2 ||
t == fl_Xatextplain ||
t == fl_XaUtf8String) {
type = t;
break;
}
// rest are only used if no UTF-8 available:
if (t == fl_XaText ||
t == fl_XaTextUriList ||
t == fl_XaCompoundText) type = t;
}
found:
XFree(portion); portion = 0;
if (!type) { // not found
if (Fl::e_clipboard_type == Fl::clipboard_image)
return true;
else
type = fl_XaUtf8String; // text: try this anyway (was: XA_STRING)
} // not found
Atom property = xevent.xselection.property;
XConvertSelection(fl_display, property, type, property,
fl_xid(Fl::first_window()),
fl_event_time);
if (type == fl_XaImageBmp) {
Fl::e_clipboard_type = Fl::clipboard_image;
//buffer_format = "image/bmp";
}
else if (type == fl_XaImagePNG) {
Fl::e_clipboard_type = Fl::clipboard_image;
//buffer_format = "image/png";
}
else {
Fl::e_clipboard_type = Fl::clipboard_plain_text;
// buffer_format = Fl::clipboard_plain_text;
}
// fprintf(stderr,"used format=%s\n", buffer_format);
return true;
}
if (actual == fl_INCR) {
@ -1554,7 +1604,7 @@ int fl_handle(const XEvent& thisevent)
int retval = fl_selection_requestor->handle(Fl::e_number = FL_PASTE);
if (!retval && Fl::e_clipboard_type == Fl::clipboard_image) {
delete (Fl_RGB_Image*)Fl::e_clipboard_data;
Fl::e_clipboard_data= NULL;
Fl::e_clipboard_data = NULL;
}
Fl::e_number = old_event;
// Detect if this paste is due to Xdnd by the property name (I use
@ -1567,13 +1617,15 @@ int fl_handle(const XEvent& thisevent)
fl_xevent->xselection.requestor);
fl_dnd_source_window = 0; // don't send a second time
}
return 1;}
return 1;
} // SelectionNotify
case SelectionClear: {
int clipboard = fl_xevent->xselectionclear.selection == CLIPBOARD;
fl_i_own_selection[clipboard] = 0;
poll_clipboard_owner();
return 1;}
return 1;
}
case SelectionRequest: {
XSelectionEvent e;
@ -1590,7 +1642,7 @@ int fl_handle(const XEvent& thisevent)
XChangeProperty(fl_display, e.requestor, e.property,
XA_ATOM, atom_bits, 0, (unsigned char*)a, 3);
} else {
if (/*e.target == XA_STRING &&*/ fl_selection_length[clipboard]) {
if (fl_selection_length[clipboard]) { // data available
if (e.target == fl_XaUtf8String ||
e.target == XA_STRING ||
e.target == fl_XaCompoundText ||
@ -1607,10 +1659,7 @@ int fl_handle(const XEvent& thisevent)
(unsigned char *)fl_selection_buffer[clipboard],
fl_selection_length[clipboard]);
}
} else {
// char* x = XGetAtomName(fl_display,e.target);
// fprintf(stderr,"selection request of %s\n",x);
// XFree(x);
} else { // no data available
e.property = 0;
}
}
@ -1630,8 +1679,9 @@ int fl_handle(const XEvent& thisevent)
}
}
}
XSendEvent(fl_display, e.requestor, 0, 0, (XEvent *)&e);}
XSendEvent(fl_display, e.requestor, 0, 0, (XEvent *)&e);
return 1;
} // SelectionRequest
// events where interesting window id is in a different place:
case CirculateNotify:
@ -1647,7 +1697,7 @@ int fl_handle(const XEvent& thisevent)
case UnmapNotify:
xid = xevent.xmaprequest.window;
break;
}
} // switch (xevent.type)
int event = 0;
Fl_Window* window = fl_find(xid);
@ -1677,7 +1727,7 @@ int fl_handle(const XEvent& thisevent)
in_a_window = true;
fl_dnd_source_window = data[0];
// version number is data[1]>>24
// printf("XdndEnter, version %ld\n", data[1] >> 24);
// fprintf(stderr, "XdndEnter, version %ld\n", data[1] >> 24);
if (data[1]&1) {
// get list of data types:
Atom actual; int format; unsigned long count, remaining;
@ -1706,25 +1756,16 @@ int fl_handle(const XEvent& thisevent)
fl_dnd_source_types[3] = 0;
}
// Loop through the source types and pick the first text type...
unsigned i;
Atom type = ((Atom*)fl_dnd_source_types)[0];
for (i = 0; fl_dnd_source_types[i]; i ++) {
Atom t = ((Atom*)fl_dnd_source_types)[i];
//printf("fl_dnd_source_types[%d]=%ld(%s)\n",i,t,XGetAtomName(fl_display,t));
if (t == fl_Xatextplainutf || // "text/plain;charset=UTF-8"
t == fl_Xatextplainutf2 || // "text/plain;charset=utf-8" -- See STR#2930
t == fl_Xatextplain || // "text/plain"
t == fl_XaUtf8String) { // "UTF8_STRING"
type = t;
break;
// Pick the "best" source (text) type...
// *FIXME* what if we don't find a suitable type? (see below: first type?)
// *FIXME* count (zero terminated) dnd sources (must be at least 1)
int dnd_sources;
for (dnd_sources = 0; fl_dnd_source_types[dnd_sources]; dnd_sources++) {
// empty
}
// rest are only used if no UTF-8 available:
if (t == fl_XaText || // "TEXT"
t == fl_XaTextUriList || // "text/uri-list"
t == fl_XaCompoundText) type = t; // "COMPOUND_TEXT"
}
fl_dnd_type = type;
fl_dnd_type = find_target_text(fl_dnd_source_types, dnd_sources);
if (!fl_dnd_type) // not found: pick first type
fl_dnd_type = fl_dnd_source_types[0];
event = FL_DND_ENTER;
Fl::e_text = unknown;
@ -1791,7 +1832,8 @@ int fl_handle(const XEvent& thisevent)
return 1;
}
break;}
break;
} // case ClientMessage
case UnmapNotify:
event = FL_HIDE;
@ -2223,8 +2265,8 @@ int fl_handle(const XEvent& thisevent)
window->position(rint(xpos/s), rint(ypos/s));
}
break;
}
}
} // ReparentNotify
} // if (window) switch (xevent.type)
#if HAVE_XFIXES
switch (xevent.type - xfixes_event_base) {

13
src/fl_dnd_x.cxx
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@ -1,7 +1,7 @@
//
// Drag & Drop code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2018 by Bill Spitzak and others.
// Copyright 1998-2021 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
@ -21,7 +21,6 @@
#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;
@ -32,7 +31,6 @@ extern Atom fl_XdndDrop;
extern Atom fl_XdndStatus;
extern Atom fl_XdndActionCopy;
extern Atom fl_XdndFinished;
//extern Atom fl_XdndProxy;
extern Atom fl_XdndURIList;
extern Atom fl_XaUtf8String;
@ -90,7 +88,6 @@ int Fl_X11_Screen_Driver::dnd(int unused) {
XSetSelectionOwner(fl_display, fl_XdndSelection, fl_message_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;
@ -145,12 +142,12 @@ int Fl_X11_Screen_Driver::dnd(int unused) {
!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, XA_STRING, 0);
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, 0, 0);
fl_sendClientMessage(target_window, fl_XdndEnter, source_window, dndversion<<24,
fl_XaUtf8String, XA_STRING, 0);
}
}
}