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prepare DnD for copying processor state

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This commit is contained in:
Robin Gareus 2016-03-11 21:59:36 +01:00
parent 8e147462d2
commit 99801187e8
1 changed files with 33 additions and 7 deletions
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40
libs/gtkmm2ext/gtkmm2ext/dndvbox.h
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@ -46,6 +46,8 @@ public:
virtual bool is_selectable () const = 0;
virtual bool drag_data_get (Glib::RefPtr<Gdk::DragContext> const, Gtk::SelectionData &) { return false; }
virtual bool can_copy_state (DnDVBoxChild*) const = 0;
};
/** A VBox whose contents can be dragged and dropped */
@ -59,6 +61,7 @@ public:
, _drag_icon (0)
, _expecting_unwanted_button_event (false)
, _placeholder (0)
, _drag_child (0)
{
add (_internal_vbox);
@ -75,7 +78,7 @@ public:
_internal_vbox.show ();
drag_dest_set (_targets);
drag_dest_set (_targets, Gtk::DEST_DEFAULT_ALL, Gdk::DragAction (Gdk::ACTION_COPY | Gdk::ACTION_MOVE | Gdk::ACTION_LINK));
signal_drag_data_received().connect (mem_fun (*this, &DnDVBox::drag_data_received));
}
@ -440,21 +443,33 @@ private:
return n;
}
bool drag_motion (Glib::RefPtr<Gdk::DragContext> const &, int /*x*/, int y, guint)
bool drag_motion (Glib::RefPtr<Gdk::DragContext> const & ctx, int /*x*/, int y, guint tme)
{
if (_children.empty ()) {
return false;
}
T* before;
T* at;
T* at = NULL;
T* after;
/* decide where we currently are */
double const c = get_children_around_position (y, &before, &at, &after);
/* whether we're in the top or bottom half of the child that we're over */
bool top_half = (c - int (c)) < 0.5;
bool top_half = (c - int (c)) < .5;
bool bottom_half = !top_half;
if (_drag_source != this /* re-order */
&& _drag_source && at
&& _drag_source->_drag_child
&& _drag_source->selection ().size () == 1
&& at != _drag_source->_drag_child // can't happen or can it?
&& at->can_copy_state (_drag_source->_drag_child))
{
top_half = (c - int (c)) < 0.33;
bottom_half = (c - int (c)) > 0.8; // increase area >> 0.66; plugin below will move, or there's space
}
/* Note that when checking on whether to remove a placeholder, we never do
so if _drag_child is 0 as this means that the child being dragged is
@ -468,14 +483,25 @@ private:
return false;
}
if (!top_half && _drag_child && (at == _drag_child || after == _drag_child)) {
if (bottom_half && _drag_child && (at == _drag_child || after == _drag_child)) {
/* dropping here would have no effect, so remove the visual cue */
remove_placeholder ();
return false;
}
create_or_update_placeholder (c);
return false;
printf ("%x\n", ctx->get_suggested_action());
if (top_half || bottom_half) {
create_or_update_placeholder (c);
if (_drag_source == this /* re-order */) {
ctx->drag_status (Gdk::ACTION_MOVE, tme);
} else {
ctx->drag_status (Gdk::ACTION_COPY, tme);
}
} else {
ctx->drag_status (Gdk::ACTION_LINK, tme);
remove_placeholder ();
}
return true;
}
void drag_leave (Glib::RefPtr<Gdk::DragContext> const &, guint)