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# pyglet
# Copyright (c) 2006-2008 Alex Holkner
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"""Mouse constants and utilities for pyglet.window.
"""
__docformat__ = 'restructuredtext'
__version__ = '$Id$'


class MouseStateHandler(dict):
    """Simple handler that tracks the state of buttons from the mouse. If a
    button is pressed then this handler holds a True value for it.

    For example::

        >>> win = window.Window
        >>> mousebuttons = mouse.MouseStateHandler()
        >>> win.push_handlers(mousebuttons)

        # Hold down the "left" button...

        >>> mousebuttons[mouse.LEFT]
        True
        >>> mousebuttons[mouse.RIGHT]
        False

    """
    def on_mouse_press(self, x, y, button, modifiers):
        self[button] = True
        
    def on_mouse_release(self, x, y, button, modifiers):
        self[button] = False
        
    def __getitem__(self, key):
        return self.get(key, False)


def buttons_string(buttons):
    """Return a string describing a set of active mouse buttons.

    Example::

        >>> buttons_string(LEFT | RIGHT)
        'LEFT|RIGHT'

    :Parameters:
        `buttons` : int
            Bitwise combination of mouse button constants.

    :rtype: str
    """
    button_names = []
    if buttons & LEFT:
        button_names.append('LEFT')
    if buttons & MIDDLE:
        button_names.append('MIDDLE')
    if buttons & RIGHT:
        button_names.append('RIGHT')
    return '|'.join(button_names)

# Symbolic names for the mouse buttons
LEFT =   1 << 0
MIDDLE = 1 << 1
RIGHT =  1 << 2
