Source code for gaphas.tool.hover

from gi.repository import Gdk, Gtk

from gaphas.cursor import cursor
from gaphas.tool.itemtool import find_item_and_handle_at_point
from gaphas.view import GtkView


def hover_tool(view: GtkView) -> Gtk.EventController:
    """Highlight the currently hovered item."""
    ctrl = (
        Gtk.EventControllerMotion.new(view)
        if Gtk.get_major_version() == 3
        else Gtk.EventControllerMotion.new()
    )
    ctrl.connect("motion", on_motion)
    return ctrl


def on_motion(ctrl, x, y):
    view = ctrl.get_widget()
    pos = (x, y)
    item, handle = find_item_and_handle_at_point(view, pos)
    view.selection.hovered_item = item

    if item:
        v2i = view.get_matrix_v2i(item)
        pos = v2i.transform_point(x, y)
    set_cursor(view, cursor(item, handle, pos))


def set_cursor(view, cursor_name):
    if Gtk.get_major_version() == 3:
        display = view.get_display()
        cursor = Gdk.Cursor.new_from_name(display, cursor_name)
        view.get_window().set_cursor(cursor)
    else:
        cursor = Gdk.Cursor.new_from_name(cursor_name)
        view.set_cursor(cursor)