/*
- Copyright (C) 2009 Paul Davis
+ Copyright (C) 2009 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
namespace Gtkmm2ext {
-/** Parent class for children of a DnDVBox */
+/** Parent class for children of a DnDVBox */
class /*LIBGTKMM2EXT_API*/ DnDVBoxChild
{
public:
virtual ~DnDVBoxChild () {}
-
+
/** @return The widget that is to be put into the DnDVBox */
virtual Gtk::Widget& widget () = 0;
-
+
/** @return An EventBox containing the widget that should be used for selection, dragging etc. */
virtual Gtk::EventBox& action_widget () = 0;
/** Set the child's visual state */
virtual void set_visual_state (VisualState, bool onoff) = 0;
+
+ /** @return True if the child can be selected in the list ( if you don't want it to copy/paste/drag then turn this off ) */
+ 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 */
class /*LIBGTKMM2EXT_API*/ DnDVBox : public Gtk::EventBox
{
public:
- DnDVBox () : _active (0), _drag_icon (0), _expecting_unwanted_button_event (false), _placeholder (0)
+ DnDVBox (std::list<Gtk::TargetEntry> targets)
+ : _targets (targets)
+ , _active (0)
+ , _drag_icon (0)
+ , _expecting_unwanted_button_event (false)
+ , _placeholder (0)
+ , _drag_child (0)
{
- _targets.push_back (Gtk::TargetEntry ("processor"));
add (_internal_vbox);
add_events (
signal_drag_leave().connect (mem_fun (*this, &DnDVBox::drag_leave));
_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));
}
-
+
virtual ~DnDVBox ()
{
clear ();
-
+
delete _drag_icon;
}
/** Add a child at the end of the widget. The DnDVBox will take responsibility for deleting the child */
- void add_child (T* child)
+ void add_child (T* child, std::list<Gtk::TargetEntry> targets = std::list<Gtk::TargetEntry>())
{
- child->action_widget().drag_source_set (_targets);
+ if (targets.empty ()) {
+ child->action_widget().drag_source_set (_targets);
+ } else {
+ child->action_widget().drag_source_set (targets);
+ }
child->action_widget().signal_drag_begin().connect (sigc::bind (mem_fun (*this, &DnDVBox::drag_begin), child));
child->action_widget().signal_drag_data_get().connect (sigc::bind (mem_fun (*this, &DnDVBox::drag_data_get), child));
child->action_widget().signal_drag_end().connect (sigc::bind (mem_fun (*this, &DnDVBox::drag_end), child));
child->action_widget().signal_button_press_event().connect (sigc::bind (mem_fun (*this, &DnDVBox::button_press), child));
child->action_widget().signal_button_release_event().connect (sigc::bind (mem_fun (*this, &DnDVBox::button_release), child));
-
+
_internal_vbox.pack_start (child->widget(), false, false);
-
+
_children.push_back (child);
child->widget().show ();
}
return _selection;
}
- /** Set the `active' child; this is simply a child which is set to have the
+ /** Set the `active' child; this is simply a child which is set to have the
* visual state "active" for whatever purposes the client may have.
* @param c Child, or 0 for none.
*/
T* after;
std::pair<T*, double> r;
-
+
r.second = get_children_around_position (y, &before, &r.first, &after);
return r;
{
return create_or_update_placeholder (get_child_at_position (y).second);
}
-
+
/** Children have been reordered by a drag */
sigc::signal<void> Reordered;
* Parameters are the source DnDVBox, our child which the other one was dropped on (or 0) and the DragContext.
*/
sigc::signal<void, DnDVBox*, T*, Glib::RefPtr<Gdk::DragContext> const & > DropFromAnotherBox;
+ sigc::signal<void, Gtk::SelectionData const &, T*, Glib::RefPtr<Gdk::DragContext> const & > DropFromExternal;
sigc::signal<void> SelectionChanged;
private:
return bottom;
}
-
+
/** Look at a y coordinate and find the children below y, and the ones either side.
* @param y y position.
* @param before Filled in with the child before, or 0.
while (y >= bottom && j != _children.end()) {
top = bottom;
-
+
*before = *j;
++i;
++j;
void drag_begin (Glib::RefPtr<Gdk::DragContext> const & context, T* child)
{
_drag_child = child;
-
+
/* make up an icon for the drag */
_drag_icon = new Gtk::Window (Gtk::WINDOW_POPUP);
-
+
Gtk::Allocation a = child->action_widget().get_allocation ();
_drag_icon->set_size_request (a.get_width(), a.get_height());
-
+
_drag_icon->signal_expose_event().connect (sigc::mem_fun (*this, &DnDVBox::icon_expose));
_drag_icon->set_name (get_name ());
int w, h;
_drag_icon->get_size (w, h);
_drag_icon->drag_set_as_icon (context, w / 2, h / 2);
-
+
_drag_source = this;
}
cairo_rectangle (cr, 0, 0, w, h);
cairo_fill (cr);
cairo_destroy (cr);
-
+
return false;
}
-
- void drag_data_get (Glib::RefPtr<Gdk::DragContext> const &, Gtk::SelectionData & selection_data, guint, guint, T* child)
+
+ void drag_data_get (Glib::RefPtr<Gdk::DragContext> const &context, Gtk::SelectionData & selection_data, guint, guint, T* child)
{
- selection_data.set (selection_data.get_target(), 8, (const guchar *) &child, sizeof (&child));
+ if (!child->drag_data_get(context, selection_data)) {
+ selection_data.set (selection_data.get_target(), 8, (const guchar *) &child, sizeof (&child));
+ }
}
-
+
void drag_data_received (
Glib::RefPtr<Gdk::DragContext> const & context, int /*x*/, int y, Gtk::SelectionData const & selection_data, guint /*info*/, guint time
)
{
/* work out where it was dropped */
std::pair<T*, double> const drop = get_child_at_position (y);
-
+
+ if (selection_data.get_target () != _targets.front ().get_target ()) {
+ DropFromExternal (selection_data, drop.first, context);
+ context->drag_finish (false, false, time);
+ return;
+ }
+
if (_drag_source == this) {
/* dropped from ourselves onto ourselves */
/* where in the list this child should be dropped */
int target = drop.second + 0.5;
-
+
/* find out whether the child was `picked up' from before the drop position */
int n = 0;
typename std::list<T*>::const_iterator i = _children.begin ();
++i;
++n;
}
-
+
/* if so, adjust the drop position to account for this */
if (n < target) {
--target;
}
-
+
_internal_vbox.reorder_child (child->widget(), target);
}
-
+
} else {
-
+
/* drag started in another DnDVBox; raise a signal to say what happened */
-
+
std::list<T*> dropped = _drag_source->selection ();
DropFromAnotherBox (_drag_source, drop.first, context);
}
-
+
context->drag_finish (false, false, time);
}
-
+
void drag_end (Glib::RefPtr<Gdk::DragContext> const &, T *)
{
delete _drag_icon;
_drag_icon = 0;
-
+
_drag_child = 0;
remove_placeholder ();
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
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;
+ 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)
if (child) {
_expecting_unwanted_button_event = true;
}
-
+
if (ev->button == 1 || ev->button == 3) {
if (!selected (child)) {
if (selecting && !was_selected) {
add_to_selection (*i);
}
-
+
if (!selecting && !done) {
if (selected (*i)) {
selecting = true;
}
} else {
-
+
if ((ev->state & Gdk::CONTROL_MASK) == 0) {
clear_selection ();
}
-
+
if (child) {
add_to_selection (child);
}
}
-
+
SelectionChanged (); /* EMIT SIGNAL */
-
+
} else {
/* XXX THIS NEEDS GENERALIZING FOR OS X */
if (ev->button == 1 && (ev->state & Gdk::CONTROL_MASK)) {
return ButtonPress (ev, child); /* EMIT SIGNAL */
}
-
+
bool button_release (GdkEventButton* ev, T* child)
{
if (_expecting_unwanted_button_event == true && child == 0) {
setup_child_state (*i);
}
}
-
+
void add_to_selection (T* child)
{
+ if ( !child->is_selectable() )
+ return;
_selection.push_back (child);
setup_child_state (child);
}
setup_child_state (c);
}
}
-
+
T* child_from_widget (Gtk::Widget const * w) const
{
typename std::list<T*>::const_iterator i = _children.begin();
while (i != _children.end() && &(*i)->widget() != w) {
++i;
}
-
+
if (i == _children.end()) {
return 0;
}
return *i;
}
-
+
Gtk::VBox _internal_vbox;
std::list<Gtk::TargetEntry> _targets;
std::list<T*> _children;
Gtk::Label* _placeholder;
/** Our child being dragged, or 0 */
T* _drag_child;
-
+
static DnDVBox* _drag_source;
-
+
};
template <class T>
DnDVBox<T>* DnDVBox<T>::_drag_source = 0;
-
+
}
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