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selection watcher: Actually watch selections 

When the selection that is watched by an active selection watcher
changes, then the signal "selection_changed" is emitted on the watcher.
This signal has one boolean argument that indicates if the selection is
owned. This means that this argument is false when the selection owner
went away and the selection now has no owner at all.

Signed-off-by: Uli Schlachter <psychon@znc.in>
This commit is contained in:
Uli Schlachter 2019-02-06 10:27:59 +01:00
parent a24f35532c
commit 1304373a19
1 changed files with 48 additions and 0 deletions
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48
objects/selection_watcher.c
View File

@ -34,6 +34,8 @@ typedef struct selection_watcher_t
int active_ref;
/** Atom identifying the selection to watch */
xcb_atom_t selection;
/** Window used for watching */
xcb_window_t window;
} selection_watcher_t;
static lua_class_t selection_watcher_class;
@ -42,6 +44,27 @@ LUA_OBJECT_FUNCS(selection_watcher_class, selection_watcher_t, selection_watcher
void
event_handle_xfixes_selection_notify(xcb_generic_event_t *ev)
{
xcb_xfixes_selection_notify_event_t *e = (void *) ev;
lua_State *L = globalconf_get_lua_State();
/* Iterate over all active selection watchers */
lua_pushliteral(L, REGISTRY_WATCHER_TABLE_INDEX);
lua_rawget(L, LUA_REGISTRYINDEX);
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
if (lua_type(L, -1) == LUA_TUSERDATA) {
selection_watcher_t *selection = lua_touserdata(L, -1);
if (selection->selection == e->selection && selection->window == e->window) {
lua_pushboolean(L, e->owner != XCB_NONE);
luaA_object_emit_signal(L, -2, "selection_changed", 1);
}
}
/* Remove the watcher */
lua_pop(L, 1);
}
/* Remove watcher table */
lua_pop(L, 1);
}
/** Create a new selection watcher object.
@ -59,6 +82,7 @@ luaA_selection_watcher_new(lua_State *L)
name = luaL_checklstring(L, 2, &name_length);
selection = (void *) selection_watcher_class.allocator(L);
selection->active_ref = LUA_NOREF;
selection->window = XCB_NONE;
/* Get the atom identifying the selection to watch */
reply = xcb_intern_atom_reply(globalconf.connection,
@ -83,6 +107,25 @@ luaA_selection_watcher_set_active(lua_State *L, selection_watcher_t *selection)
{
/* Selection becomes active */
/* Create a window for it */
if (selection->window == XCB_NONE)
selection->window = xcb_generate_id(globalconf.connection);
xcb_create_window(globalconf.connection, globalconf.screen->root_depth,
selection->window, globalconf.screen->root, -1, -1, 1, 1, 0,
XCB_COPY_FROM_PARENT, globalconf.screen->root_visual,
0, NULL);
/* Start watching for selection changes */
if (globalconf.have_xfixes)
{
xcb_xfixes_select_selection_input(globalconf.connection, selection->window, selection->selection,
XCB_XFIXES_SELECTION_EVENT_MASK_SET_SELECTION_OWNER |
XCB_XFIXES_SELECTION_EVENT_MASK_SELECTION_WINDOW_DESTROY |
XCB_XFIXES_SELECTION_EVENT_MASK_SELECTION_CLIENT_CLOSE);
} else {
luaA_warn(L, "X11 server does not support the XFixes extension; cannot watch selections");
}
/* Reference the selection watcher. For this, first get the tracking
* table out of the registry. */
lua_pushliteral(L, REGISTRY_WATCHER_TABLE_INDEX);
@ -95,6 +138,11 @@ luaA_selection_watcher_set_active(lua_State *L, selection_watcher_t *selection)
/* And pop the tracking table again */
lua_pop(L, 1);
} else {
/* Stop watching and destroy the window */
if (globalconf.have_xfixes)
xcb_xfixes_select_selection_input(globalconf.connection, selection->window, selection->selection, 0);
xcb_destroy_window(globalconf.connection, selection->window);
/* Unreference the selection object */
lua_pushliteral(L, REGISTRY_WATCHER_TABLE_INDEX);
lua_rawget(L, LUA_REGISTRYINDEX);