76 lines
2.0 KiB
Python
76 lines
2.0 KiB
Python
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'''
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Cursor
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======
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Shows a cursor following mouse motion events, useful on systems with no
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visible native mouse cursor.
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Configuration
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-------------
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:Parameters:
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`texture`: str, defaults to
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'data/images/cursor.png' Image used to represent the cursor if
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displayed
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`size`: tuple, defaults to (40, 40)
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Apparent size of the mouse cursor, if displayed, (None,None) value
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will keep its real size.
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`offset`: tuple, defaults to (None, None)
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Offset of the texture image. The default value will align the
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top-left corner of the image to the mouse pos.
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Example
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-------
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In your configuration (`~/.kivy/config.ini`), you can add something like
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this::
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[modules]
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cursor = texture=mypointer.png,size=20x20,offset=20x20
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.. versionadded:: 1.10.0
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'''
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__all__ = ('start', 'stop')
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from kivy.core.image import Image
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from kivy.graphics import Color, Rectangle
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from kivy import kivy_data_dir
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from kivy.compat import string_types
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from os.path import join
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from functools import partial
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def _mouse_move(texture, size, offset, win, pos, *args):
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if hasattr(win, '_cursor'):
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c = win._cursor
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else:
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with win.canvas.after:
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Color(1, 1, 1, 1, mode='rgba')
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win._cursor = c = Rectangle(texture=texture, size=size)
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c.pos = pos[0] + offset[0], pos[1] - size[1] + offset[1]
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def start(win, ctx):
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cursor_texture = Image(
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ctx.config.get('texture', join(kivy_data_dir, 'images', 'cursor.png'))
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).texture
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cursor_size = ctx.config.get('size')
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if isinstance(cursor_size, string_types):
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cursor_size = [int(x) for x in cursor_size.split('x')]
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elif not cursor_size:
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cursor_size = cursor_texture.size
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cursor_offset = ctx.config.get('offset', (0, 0))
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if isinstance(cursor_offset, string_types):
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cursor_offset = [int(x) for x in cursor_offset.split('x')]
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win.bind(
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mouse_pos=partial(
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_mouse_move, cursor_texture, cursor_size, cursor_offset))
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def stop(win, ctx):
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win.unbind(mouse_pos=_mouse_move)
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