Thanks for the fix. My solution for the moment is to override the handle function. It would be easier to handle with when() but now I need to detect some other user interactions too so there is no way around overriding the handle function.
> On 02/20/12 04:09, Geoffrey Mellar wrote: >> Hello, >> i want a Fl_tree widget to call the callback function >> only if there is a double click. > > Yes, there should really be an example that > shows how to do this. If there was, this bug > probably would have been caught. > >> Because there is no >> FL_WHEN_DOUBLE_CLICK or something else I decided to >> use <tree>.when(FL_WHEN_NEVER). With this option enabled, >> a callback should never happen. There is a handle function >> to recognize the double click. > >> This works fine but despite >> the call to wid_waypoint_list.when(FL_WHEN_NEVER); there are >> also callbacks on every other widget action. Is anyone >> familiar with this problem? > > Sounds like a bug in Fl_Tree's handling of when(). > Inside Fl_Tree::handle(), calls like this: > > select_only(_item_focus); > > ..should really be changed to this: > > select_only(_item_focus, when()); > > I've submitted STR #2807 on your behalf: > http://fltk.org/str.php?L2807 > Should be fixed in the next update to 1.3. > > I'll try to post a patch for SVN which you can use > to fix Fl_Tree to support FL_WHEN_NEVER properly. > > There really should be an easier way to allow callback() > to handle multi-clicks more easily than having to derive > from Fl_Tree and override handle(). > > I should probably implement an FL_TREE_REASON_CLICKED > so that any click events on an item can be detected, > instead of just select/deselect/open/closed events. > > Regarding detecting double-clicks on items, I think you > should be able to something like this for now: > > #include <stdio.h> > #include <FL/Fl.H> > #include <FL/Fl_Double_Window.H> > #include <FL/Fl_Tree.H> > // > // Detecting double-click on Fl_Tree item for 1.3.0. > // erco 1.0 02/20/2012 > // > class MyTree : public Fl_Tree { > public: > MyTree(int X,int Y,int W,int H,const char*L=0) : Fl_Tree(X,Y,W,H,L) { } > int handle(int e) { > if ( e == FL_PUSH ) { // Mouse click? > const Fl_Tree_Item *item = find_clicked(); // item clicked > if ( item ) { // valid item? > callback_item((Fl_Tree_Item*)item); // set callback item > callback_reason(FL_TREE_REASON_SELECTED); // set callback > reason > do_callback(); > } > } > return(Fl_Tree::handle(e)); > } > }; > void TreeCallback(Fl_Widget *w, void *data) { > Fl_Tree *tree = (Fl_Tree*)w; > Fl_Tree_Item *item = (Fl_Tree_Item*)tree->callback_item(); > if ( ! item ) return; > switch ( tree->callback_reason() ) { > case FL_TREE_REASON_SELECTED: { > if ( Fl::event_clicks() == 1 ) { > fprintf(stderr, "Item '%s' double clicked\n", item->label()); > } > break; > } > default: > break; > } > } > int main(int argc, char *argv[]) { > Fl_Double_Window *win = new Fl_Double_Window(250, 400, "Simple Tree"); > win->begin(); > // Create the tree > MyTree *tree = new MyTree(10, 10, win->w()-20, win->h()-20); > tree->showroot(0); > tree->callback(TreeCallback); > // Add some items > tree->add("Flintstones/Fred"); > tree->add("Flintstones/Wilma"); > tree->add("Flintstones/Pebbles"); > tree->add("Simpsons/Homer"); > tree->add("Simpsons/Marge"); > tree->add("Simpsons/Bart"); > tree->add("Simpsons/Lisa"); > win->end(); > win->resizable(win); > win->show(argc, argv); > return(Fl::run()); > } _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
