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X11: add support for copy+paste of image within one app

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ManoloFLTK
2019-07-19 08:08:37 +02:00
parent 25b947aa7d
commit b846d26233
1 changed files with 45 additions and 4 deletions
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src/Fl_x.cxx
+45 -4
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@@ -857,18 +857,56 @@ const char * fl_selection_type[2];
int fl_selection_buffer_length[2];
char fl_i_own_selection[2] = {0,0};
static void read_int(uchar *c, int& i) {
i = *c;
i |= (*(++c))<<8;
i |= (*(++c))<<16;
i |= (*(++c))<<24;
}
// turn BMP image FLTK produced by create_bmp() back to Fl_RGB_Image
static Fl_RGB_Image *own_bmp_to_RGB(char *bmp) {
int w, h;
read_int((uchar*)bmp + 18, w);
read_int((uchar*)bmp + 22, h);
int R=(3*w+3)/4 * 4; // the number of bytes per row, rounded up to multiple of 4
bmp += 54;
uchar *data = new uchar[w*h*3];
uchar *p = data;
for (int i = h-1; i >= 0; i--) {
char *s = bmp + i * R;
for (int j = 0; j < w; j++) {
*p++=s[2];
*p++=s[1];
*p++=s[0];
s+=3;
}
}
Fl_RGB_Image *img = new Fl_RGB_Image(data, w, h, 3);
img->alloc_array = 1;
return img;
}
// Call this when a "paste" operation happens:
void Fl::paste(Fl_Widget &receiver, int clipboard, const char *type) {
if (fl_i_own_selection[clipboard]) {
// We already have it, do it quickly without window server.
if (type == Fl::clipboard_plain_text && fl_selection_type[clipboard] == type) {
// Notice that the text is clobbered if set_selection is
// called in response to FL_PASTE!
// However, for now, we only paste text in this function
if (fl_selection_type[clipboard] != Fl::clipboard_plain_text) return; //TODO: allow copy/paste of image within same app
Fl::e_text = fl_selection_buffer[clipboard];
Fl::e_length = fl_selection_length[clipboard];
if (!Fl::e_text) Fl::e_text = (char *)"";
receiver.handle(FL_PASTE);
} else if (clipboard == 1 && type == Fl::clipboard_image && fl_selection_type[1] == type) {
Fl::e_clipboard_data = own_bmp_to_RGB(fl_selection_buffer[1]);
Fl::e_clipboard_type = Fl::clipboard_image;
} else return;
int retval = receiver.handle(FL_PASTE);
if (retval == 0 && type == Fl::clipboard_image) {
delete (Fl_RGB_Image*)Fl::e_clipboard_data;
Fl::e_clipboard_data = NULL;
}
return;
}
// otherwise get the window server to return it:
@@ -881,6 +919,9 @@ void Fl::paste(Fl_Widget &receiver, int clipboard, const char *type) {
int Fl::clipboard_contains(const char *type)
{
if (fl_i_own_selection[1]) {
return fl_selection_type[1] == type;
}
XEvent event;
Atom actual; int format; unsigned long count, remaining, i = 0;
unsigned char* portion = NULL;
@@ -888,8 +929,8 @@ int Fl::clipboard_contains(const char *type)
if (!win || !fl_xid(win)) return 0;
XConvertSelection(fl_display, CLIPBOARD, TARGETS, CLIPBOARD, fl_xid(win), CurrentTime);
XFlush(fl_display);
do {
XNextEvent(fl_display, &event);
do {
XNextEvent(fl_display, &event);
if (event.type == SelectionNotify && event.xselection.property == None) return 0;
i++;
}