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# This file is part of MyPaint.
# Copyright (C) 2019 by The MyPaint Team
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
from lib.observable import event
class BlendMode(object):
"""A local on-off switch for a blend mode, with a change event"""
def __init__(self, name, setting_name, active=False):
self.name = name
self.setting_name = setting_name
self._active = active
self.enabled = True
@property
def active(self):
return self._active
@active.setter
def active(self, active):
old_active = self._active
self._active = active
if old_active != active:
self.changed()
@event
def changed(self):
"""Event dispatched triggered by a
change in activation status"""
class BlendModes(object):
"""Proxy values for tools with individual blend mode states
Used by tool modes to maintain their own instances of active
blend modes and blend mode history.
In order to enable individual blend modes for a tool mode,
simply create its own BlendModes instance in a property named
blend_modes and bind any listeners to it as needed.
This class ensures that only a single mode is active at any one time
and maintains a stack of modes to determine which it should switch to
on deactivation.
"""
NORMAL = 0
ERASE = 1
LOCK_ALPHA = 2
COLORIZE = 3
def __init__(self):
self.eraser_mode = BlendMode("eraser_mode", "eraser")
self.eraser_mode.mode_type = self.ERASE
self.lock_alpha_mode = BlendMode("lock_alpha_mode", "lock_alpha")
self.lock_alpha_mode.mode_type = self.LOCK_ALPHA
self.colorize_mode = BlendMode("colorize_mode", "colorize")
self.colorize_mode.mode_type = self.COLORIZE
self.normal_mode = BlendMode("normal_mode", None, True)
self.normal_mode.mode_type = self.NORMAL
self.modes = [
self.eraser_mode, self.lock_alpha_mode,
self.colorize_mode, self.normal_mode
]
self.mode_names = map(lambda x: x.name, self.modes)
# Keep track of the active mode
self.active_mode = self.normal_mode
self.history = []
for m in self.modes:
m.changed += self._update
def _push_history(self, mode):
if mode is self.normal_mode:
del self.history[:]
return
if mode in self.history:
self.history.remove(mode)
self.history.append(mode)
def _pop_history(self, removed):
while len(self.history) > 0:
mode = self.history.pop()
if mode is not removed:
mode.active = True
return
self.normal_mode.active = True
def _update(self, mode):
old = self.active_mode
old._active = False
if mode.active:
self._push_history(mode)
self.active_mode = mode
self.mode_changed(old, mode)
else:
self._pop_history(mode)
@event
def mode_changed(self, old_mode, new_mode):
"""Triggers when a mode changes,
passing an instance of the changed mode"""
class BlendModeManager(object):
"""Manages blend mode actions by updating and redirecting
callbacks based on BlendModes state models.
A single instance "blendmodemanager" of this class is
accessible from the Application singleton.
This class allows multiple tool modes to make use of the same
blend mode actions (same hotkeys etc.) by maintaining their
own state in a BlendModes object, and taking control of the actions
by registering that state when necessary.
"""
def __init__(self, app):
self.app = app
self.delegates = []
self.action_group = self.app.builder.get_object("BrushModifierActions")
self.eraser_mode = app.find_action("BlendModeEraser")
self.lock_alpha_mode = app.find_action("BlendModeLockAlpha")
self.normal_mode = app.find_action("BlendModeNormal")
self.colorize_mode = app.find_action("BlendModeColorize")
self.actions = {
"eraser_mode": self.eraser_mode,
"lock_alpha_mode": self.lock_alpha_mode,
"normal_mode": self.normal_mode,
"colorize_mode": self.colorize_mode
}
for name in self.actions:
action = self.actions[name]
action.set_draw_as_radio(True)
self.app.kbm.takeover_action(action)
self._bm = None
def register(self, bm):
"""Connect the blend mode actions to the given BlendModes object"""
assert isinstance(bm, BlendModes)
self.delegates.insert(0, bm)
self._setup(bm)
def update(self, bm, old, new):
"""Update actions without triggering change listeners"""
old_action = self.actions[old.name]
old_action.block_activate()
old_action.set_active(False)
old_action.unblock_activate()
new_action = self.actions[new.name]
new_action.block_activate()
new_action.set_active(True)
new_action.unblock_activate()
def _setup(self, bm):
"""Set up listener and controls for new model and
remove listener for old model"""
# Deregister old change listener
if self._bm:
self._bm.mode_changed -= self.update
# Update change listener
self._bm = bm
self._bm.mode_changed += self.update
# Set up actions based on new BlendModes object
for mode in bm.modes:
action = self.actions[mode.name]
action.block_activate()
action.set_active(mode.active)
action.set_sensitive(mode.enabled)
action.unblock_activate()
def deregister(self, bm):
"""Disconnect the blend mode actions from the given BlendModes
if it is active.
Remove the object from the stack and connect the next object in
line for control, if such an object exists.
"""
assert(isinstance(bm, BlendModes))
if bm in self.delegates:
self.delegates.remove(bm)
else:
return
if self.delegates:
self._setup(self.delegates[0])
else:
self._bm = None
for action in self.actions.values():
action.set_active(False)
action.set_enabled(False)
def blend_mode_normal_cb(self, action):
if self._bm:
self._bm.normal_mode.active = action.get_active()
def blend_mode_eraser_cb(self, action):
if self._bm:
self._bm.eraser_mode.active = action.get_active()
def blend_mode_lock_alpha_cb(self, action):
if self._bm:
self._bm.lock_alpha_mode.active = action.get_active()
def blend_mode_colorize_cb(self, action):
if self._bm:
self._bm.colorize_mode.active = action.get_active()
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