Methods

Methods
	Chapter 19. Drag and Drop

Widgets can be identified as sources or targets using Gtk::DragSource and Gtk::DropTarget event controllers.

auto source = Gtk::DragSource::create();
m_source_widget.add_controller(source);

Some DragSource methods:

void set_content(const Glib::RefPtr<Gdk::ContentProvider>& content): Sets a content provider on the drag source.
void set_actions(Gdk::DragAction actions): Sets the actions on the drag source. For instance Gdk::DragAction::COPY | Gdk::DragAction::MOVE.
void set_icon(const Glib::RefPtr<const Gdk::Paintable>& paintable, int hot_x, int hot_y): Sets a paintable to use as icon during DND operations.

auto target = Gtk::DropTarget::create(gtype, actions);
m_target_widget.add_controller(target);

Some DropTarget methods:

void set_gtypes(const std::vector<GType>& types): Sets the supported types for this drop target.
void set_actions(Gdk::DragAction actions): Sets the actions that this drop target supports.
Glib::ValueBase get_value() const: Gets the current drop data, as a Glib::Value.
void reject(): Rejects the ongoing drop operation. This function should be used when delaying the decision on whether to accept a drag or not until after reading the data.