diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/Fl_Widget.cxx | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/src/Fl_Widget.cxx b/src/Fl_Widget.cxx index 36c2e1ccb..31d8818aa 100644 --- a/src/Fl_Widget.cxx +++ b/src/Fl_Widget.cxx @@ -73,7 +73,34 @@ Fl_Widget *Fl::readqueue() { if (obj_tail >= QUEUE_SIZE) obj_tail = 0; return o; } - +/* + This static internal function removes all pending callbacks for a + specific widget from the default callback queue (Fl::readqueue()). + It is only called from Fl_Widget's destructor if the widget + doesn't have an own callback. + Note: There's no need to have this in the Fl:: namespace. +*/ +static void cleanup_readqueue(Fl_Widget *w) { + + if (obj_tail==obj_head) return; + + // Read the entire queue and copy over all valid entries. + // The new head will be determined after the last copied entry. + + int old_head = obj_head; // save newest entry + int entry = obj_tail; // oldest entry + obj_head = obj_tail; // new queue start + for (;;) { + Fl_Widget *o = obj_queue[entry++]; + if (entry >= QUEUE_SIZE) entry = 0; + if (o != w) { // valid entry + obj_queue[obj_head++] = o; + if (obj_head >= QUEUE_SIZE) obj_head = 0; + } // valid entry + if (entry == old_head) break; + } + return; +} //////////////////////////////////////////////////////////////// int Fl_Widget::handle(int) { @@ -150,6 +177,8 @@ Fl_Widget::~Fl_Widget() { #endif // DEBUG_DELETE parent_ = 0; // Don't throw focus to a parent widget. fl_throw_focus(this); + // remove stale entries from default callback queue (Fl::readqueue()) + if (callback_ == default_callback) cleanup_readqueue(this); } /** Draws a focus box for the widget at the given position and size */ |