Methods
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## Methods

Widgets can be identified as sources or destinations using these Gtk::Widget methods:

    void drag_source_set(const ArrayHandle_TargetEntry& targets, GdkModifierType start_button_mask, GdkDragAction actions);

- `targets` is a container of Gtk::TargetEntry (std::list<Gtk::TargetEntry> or std::vector<Gtk::TargetEntry>, for instance) elements.

- `start_button_mask` is an ORed combination of values, which specify which modifier key or mouse button must be pressed to start the drag.

- `actions` is an ORed combination of values, which specified which Drag and Drop operations will be possible from this source - for instance, copy, move, or link. The user can choose between the actions by using modifier keys, such as `Shift` to change from `copy` to `move`, and this will be shown by a different cursor.

    void drag_dest_set(const ArrayHandle_TargetEntry& targets, GtkDestDefaults flags, GdkDragAction actions);

- `flags` is an ORed combination of values which indicates how the widget will respond visually to Drag and Drop items.

- `actions` indicates the Drag and Drop actions which this destination can receive - see the description above.

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