gaphas.tool.hover - Gaphas

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# Source code for gaphas.tool.hover

    from gi.repository import Gdk, Gtk

    from typing import Callable, Union

    from gaphas.cursor import cursor
    from gaphas.tool.itemtool import default_find_item_and_handle_at_point
    from gaphas.connector import Handle
    from gaphas.item import Item
    from gaphas.types import Pos
    from gaphas.view import GtkView

    def hover_tool(
        find_item_and_handle_at_point: Callable[
            [GtkView, Pos], Union[tuple[Item, Union[Handle, None]], tuple[None, None]]
        ] = default_find_item_and_handle_at_point,
    ) -> Gtk.EventController:
        """Highlight the currently hovered item."""
        ctrl = Gtk.EventControllerMotion.new()
        ctrl.connect("motion", on_motion, find_item_and_handle_at_point)
        ctrl.cursor_name = ""
        return ctrl

    def on_motion(ctrl, x, y, find_item_and_handle_at_point):
        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)

        cursor_name = cursor(item, handle, pos)
        if cursor_name != ctrl.cursor_name:
            set_cursor(view, cursor_name)
            ctrl.cursor_name = cursor_name

    def set_cursor(view, cursor_name):
        cursor = Gdk.Cursor.new_from_name(cursor_name)
        view.set_cursor(cursor)