text: import numpy as np
  import pytest
  import collections
  from napari.layers import Shapes
  from napari.utils.interactions import (
      ReadOnlyWrapper,
      mouse_press_callbacks,
      mouse_move_callbacks,
      mouse_release_callbacks,
  )
  
  
  @pytest.fixture
  def Event():
      """Create a subclass for simulating vispy mouse events.
  
      Returns
      -------
      Event : Type
          A new tuple subclass named Event that can be used to create a
          NamedTuple object with fields "type", "is_dragging", and "modifiers".
      """
      return collections.namedtuple(
          'Event', field_names=['type', 'is_dragging', 'modifiers']
      )
  
  
  @pytest.fixture
  def create_known_shapes_layer():
      """Create shapes layer with known coordinates
  
      Returns
      -------
      layer : napar.layers.Shapes
          Shapes layer.
      n_shapes : int
          Number of shapes in the shapes layer
      known_non_shape : list
          Data coordinates that are known to contain no shapes. Useful during
          testing when needing to guarantee no shape is clicked on.
      """
      data = [[[1, 3], [8, 4]], [[10, 10], [15, 4]]]
      known_non_shape = [20, 30]
      n_shapes = len(data)
  
      layer = Shapes(data)
      assert layer.ndim == 2
      assert len(layer.data) == n_shapes
      assert len(layer.selected_data) == 0
  
      return layer, n_shapes, known_non_shape
  
  
  def test_not_adding_or_selecting_shape(create_known_shapes_layer, Event):
      """Don't add or select a shape by clicking on one in pan_zoom mode."""
      layer, n_shapes, _ = create_known_shapes_layer
      layer.mode = 'pan_zoom'
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=False, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check no new shape added and non selected
      assert len(layer.data) == n_shapes
      assert len(layer.selected_data) == 0
  
  
  @pytest.mark.parametrize('shape_type', ['rectangle', 'ellipse', 'line'])
  def test_add_simple_shape(shape_type, create_known_shapes_layer, Event):
      """Add simple shape by clicking in add mode."""
      layer, n_shapes, known_non_shape = create_known_shapes_layer
  
      # Add shape at location where non exists
      layer.mode = 'add_' + shape_type
      layer.position = known_non_shape
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      known_non_shape_end = [40, 60]
      layer.position = known_non_shape_end
      # Simulate drag end
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=False, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check new shape added at coordinates
      assert len(layer.data) == n_shapes + 1
      np.testing.assert_allclose(layer.data[-1][0], known_non_shape)
      new_shape_max = np.max(layer.data[-1], axis=0)
      np.testing.assert_allclose(new_shape_max, known_non_shape_end)
      assert layer.shape_type[-1] == shape_type
  
  
  @pytest.mark.parametrize('shape_type', ['path', 'polygon'])
  def test_add_complex_shape(shape_type, create_known_shapes_layer, Event):
      """Add simple shape by clicking in add mode."""
      layer, n_shapes, known_non_shape = create_known_shapes_layer
  
      desired_shape = [[20, 30], [10, 50], [60, 40], [80, 20]]
      # Add shape at location where non exists
      layer.mode = 'add_' + shape_type
      layer.position = desired_shape[0]
  
      for coord in desired_shape:
          layer.position = coord
          # Simulate move, click, and release
          event = ReadOnlyWrapper(
              Event(type='mouse_move', is_dragging=False, modifiers=[])
          )
          mouse_move_callbacks(layer, event)
          event = ReadOnlyWrapper(
              Event(type='mouse_press', is_dragging=False, modifiers=[])
          )
          mouse_press_callbacks(layer, event)
          event = ReadOnlyWrapper(
              Event(type='mouse_release', is_dragging=False, modifiers=[])
          )
          mouse_release_callbacks(layer, event)
  
      # finish drawing
      layer._finish_drawing()
  
      # Check new shape added at coordinates
      assert len(layer.data) == n_shapes + 1
      np.testing.assert_allclose(layer.data[-1], desired_shape)
      assert layer.shape_type[-1] == shape_type
  
  
  def test_vertex_insert(create_known_shapes_layer, Event):
      """Add vertex to shape."""
      layer, n_shapes, known_non_shape = create_known_shapes_layer
  
      n_coord = len(layer.data[0])
      layer.mode = 'vertex_insert'
      layer.selected_data = {0}
      layer.position = known_non_shape
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate drag end
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
  
      # Check new shape added at coordinates
      assert len(layer.data) == n_shapes
      assert len(layer.data[0]) == n_coord + 1
      np.testing.assert_allclose(
          np.min(abs(layer.data[0] - known_non_shape), axis=0), [0, 0]
      )
  
  
  def test_vertex_remove(create_known_shapes_layer, Event):
      """Remove vertex from shape."""
      layer, n_shapes, known_non_shape = create_known_shapes_layer
  
      n_coord = len(layer.data[0])
      layer.mode = 'vertex_remove'
      layer.selected_data = {0}
      layer.position = tuple(layer.data[0][0])
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate drag end
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
  
      # Check new shape added at coordinates
      assert len(layer.data) == n_shapes
      assert len(layer.data[0]) == n_coord - 1
  
  
  @pytest.mark.parametrize('mode', ['select', 'direct'])
  def test_select_shape(mode, create_known_shapes_layer, Event):
      """Select a shape by clicking on one in select mode."""
      layer, n_shapes, _ = create_known_shapes_layer
  
      layer.mode = mode
      layer.position = tuple(layer.data[0][0])
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=False, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check clicked shape selected
      assert len(layer.selected_data) == 1
      assert layer.selected_data == {0}
  
  
  def test_drag_shape(create_known_shapes_layer, Event):
      """Select and drag vertex."""
      layer, n_shapes, _ = create_known_shapes_layer
  
      layer.mode = 'select'
      orig_data = layer.data[0].copy()
      assert len(layer.selected_data) == 0
  
      layer.position = tuple(np.mean(layer.data[0], axis=0))
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=False, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      assert len(layer.selected_data) == 1
      assert layer.selected_data == {0}
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=True, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
      # start drag event
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
      layer.position = tuple(np.add(layer.position, [10, 5]))
      # Simulate move, click, and release
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=True, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check clicked shape selected
      assert len(layer.selected_data) == 1
      assert layer.selected_data == {0}
      np.testing.assert_allclose(layer.data[0], orig_data + [10, 5])
  
  
  def test_drag_vertex(create_known_shapes_layer, Event):
      """Select and drag vertex."""
      layer, n_shapes, _ = create_known_shapes_layer
  
      layer.mode = 'direct'
      layer.selected_data = {0}
      layer.position = tuple(layer.data[0][0])
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      layer.position = [0, 0]
      # Simulate move, click, and release
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=True, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check clicked shape selected
      assert len(layer.selected_data) == 1
      assert layer.selected_data == {0}
      np.testing.assert_allclose(layer.data[0][-1], [0, 0])
  
  
  @pytest.mark.parametrize(
      'mode',
      [
          'select',
          'direct',
          'add_rectangle',
          'add_ellipse',
          'add_line',
          'add_polygon',
          'add_path',
          'vertex_insert',
          'vertex_remove',
      ],
  )
  def test_after_in_add_mode_shape(mode, create_known_shapes_layer, Event):
      """Don't add or select a shape by clicking on one in pan_zoom mode."""
      layer, n_shapes, _ = create_known_shapes_layer
  
      layer.mode = mode
      layer.mode = 'pan_zoom'
      layer.position = tuple(layer.data[0][0])
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=False, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check no new shape added and non selected
      assert len(layer.data) == n_shapes
      assert len(layer.selected_data) == 0
  
  
  @pytest.mark.parametrize('mode', ['select', 'direct'])
  def test_unselect_select_shape(mode, create_known_shapes_layer, Event):
      """Select a shape by clicking on one in select mode."""
      layer, n_shapes, _ = create_known_shapes_layer
  
      layer.mode = mode
      layer.position = tuple(layer.data[0][0])
      layer.selected_data = {1}
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=False, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check clicked shape selected
      assert len(layer.selected_data) == 1
      assert layer.selected_data == {0}
  
  
  @pytest.mark.parametrize('mode', ['select', 'direct'])
  def test_not_selecting_shape(mode, create_known_shapes_layer, Event):
      """Don't select a shape by not clicking on one in select mode."""
      layer, n_shapes, known_non_shape = create_known_shapes_layer
  
      layer.mode = mode
      layer.position = known_non_shape
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=False, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check clicked shape selected
      assert len(layer.selected_data) == 0
  
  
  @pytest.mark.parametrize('mode', ['select', 'direct'])
  def test_unselecting_shapes(mode, create_known_shapes_layer, Event):
      """Unselect shapes by not clicking on one in select mode."""
      layer, n_shapes, known_non_shape = create_known_shapes_layer
  
      layer.mode = mode
      layer.position = known_non_shape
      layer.selected_data = {0, 1}
      assert len(layer.selected_data) == 2
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=False, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check clicked shape selected
      assert len(layer.selected_data) == 0
  
  
  @pytest.mark.parametrize('mode', ['select', 'direct'])
  def test_selecting_shapes_with_drag(mode, create_known_shapes_layer, Event):
      """Select all shapes when drag box includes all of them."""
      layer, n_shapes, known_non_shape = create_known_shapes_layer
  
      layer.mode = mode
      layer.position = known_non_shape
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate drag start
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
  
      layer.position = [0, 0]
      # Simulate drag end
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=True, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check all shapes selected as drag box contains them
      assert len(layer.selected_data) == n_shapes
  
  
  @pytest.mark.parametrize('mode', ['select', 'direct'])
  def test_selecting_no_shapes_with_drag(mode, create_known_shapes_layer, Event):
      """Select all shapes when drag box includes all of them."""
      layer, n_shapes, known_non_shape = create_known_shapes_layer
  
      layer.mode = mode
      layer.position = known_non_shape
  
      # Simulate click
      event = ReadOnlyWrapper(
          Event(type='mouse_press', is_dragging=False, modifiers=[])
      )
      mouse_press_callbacks(layer, event)
  
      # Simulate drag start
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
  
      layer.position = [50, 60]
      # Simulate drag end
      event = ReadOnlyWrapper(
          Event(type='mouse_move', is_dragging=True, modifiers=[])
      )
      mouse_move_callbacks(layer, event)
  
      # Simulate release
      event = ReadOnlyWrapper(
          Event(type='mouse_release', is_dragging=True, modifiers=[])
      )
      mouse_release_callbacks(layer, event)
  
      # Check no shapes selected as drag box doesn't contain them
      assert len(layer.selected_data) == 0
  