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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 is_selectable () const = 0;
virtual bool drag_data_get (Glib::RefPtr<Gdk::DragContext> const, Gtk::SelectionData &) { return false; } 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 */ /** A VBox whose contents can be dragged and dropped */
@ -59,6 +61,7 @@ public:
, _drag_icon (0) , _drag_icon (0)
, _expecting_unwanted_button_event (false) , _expecting_unwanted_button_event (false)
, _placeholder (0) , _placeholder (0)
, _drag_child (0)
{ {
add (_internal_vbox); add (_internal_vbox);
@ -75,7 +78,7 @@ public:
_internal_vbox.show (); _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)); signal_drag_data_received().connect (mem_fun (*this, &DnDVBox::drag_data_received));
} }
@ -440,21 +443,33 @@ private:
return n; 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 ()) { if (_children.empty ()) {
return false; return false;
} }
T* before; T* before;
T* at; T* at = NULL;
T* after; T* after;
/* decide where we currently are */ /* decide where we currently are */
double const c = get_children_around_position (y, &before, &at, &after); 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 */ /* 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 /* 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 so if _drag_child is 0 as this means that the child being dragged is
@ -468,14 +483,25 @@ private:
return false; 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 */ /* dropping here would have no effect, so remove the visual cue */
remove_placeholder (); remove_placeholder ();
return false; return false;
} }
create_or_update_placeholder (c); printf ("%x\n", ctx->get_suggested_action());
return false; 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) void drag_leave (Glib::RefPtr<Gdk::DragContext> const &, guint)