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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# PatchBay Canvas engine using QGraphicsView/Scene
# Copyright (C) 2010-2019 Filipe Coelho <falktx@falktx.com>
# Copyright (C) 2019-2024 Mathieu Picot <picotmathieu@gmail.com>
#
# 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 any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# For a full copy of the GNU General Public License see the doc/GPL.txt file.
from enum import Enum
from typing import TYPE_CHECKING
from qtpy.QtCore import Qt
from qtpy.QtGui import (QColor, QLinearGradient,
QPainterPath, QPen, QBrush)
from qtpy.QtWidgets import QGraphicsPathItem
from patshared import PortType
from .init_values import (
canvas,
options,
CanvasItemType)
if TYPE_CHECKING:
from .port_widget import PortWidget
class _ThemeState(Enum):
NORMAL = 0
SELECTED = 1
DISCONNECTING = 2
class _ThemeAttributes:
base_pen: QPen
color_main: QColor
color_alter: QColor | None
base_width: float
class LineWidget(QGraphicsPathItem):
def __init__(self, connection_id: int,
item1: 'PortWidget', item2: 'PortWidget'):
''' Class for connection line widget '''
QGraphicsPathItem.__init__(self)
# is true when the connection will be undo by user if (s)he
# leaves the mouse button
self.ready_to_disc = False
self._item1 = item1
self._item2 = item2
self._connection_id = connection_id
self._semi_hidden = False
self._th_attribs = dict[_ThemeState, _ThemeAttributes]()
self.update_theme()
self.setBrush(QColor(0, 0, 0, 0))
self.setGraphicsEffect(None) # type:ignore
self.update_line_pos()
def check_select_state(self):
self.update_line_gradient()
def trigger_disconnect(self):
canvas.cb.ports_disconnect(self._connection_id)
def semi_hide(self, yesno: bool):
self._semi_hidden = yesno
self.update_line_gradient()
def update_line_pos(self, fast_move=False):
item1_con_pos = self._item1.connect_pos()
item1_x = item1_con_pos.x()
item1_y = item1_con_pos.y()
item2_con_pos = self._item2.connect_pos()
item2_x = item2_con_pos.x()
item2_y = item2_con_pos.y()
x_diff = item2_x - item1_x
mid_x = abs(x_diff) / 2
diffxy = abs(item1_y - item2_y) - abs(x_diff)
if diffxy > 0:
mid_x += diffxy
mid_x = min(mid_x, max(200.0, x_diff / 2))
def type(self) -> CanvasItemType:
return CanvasItemType.BEZIER_LINE
def update_theme(self):
port_type1 = self._item1.get_port_type()
for theme_state in _ThemeState:
if theme_state is _ThemeState.DISCONNECTING:
theme = canvas.theme.line.disconnecting
else:
theme = canvas.theme.line
if port_type1 == PortType.AUDIO_JACK:
theme = theme.audio
elif port_type1 == PortType.MIDI_JACK:
theme = theme.midi
elif port_type1 == PortType.MIDI_ALSA:
theme = theme.alsa
elif port_type1 == PortType.VIDEO:
theme = theme.video
if theme_state is _ThemeState.SELECTED:
theme = theme.selected
tha = _ThemeAttributes()
tha.base_pen = theme.fill_pen
tha.color_main = theme.background_color
tha.color_alter = theme.background2_color
if tha.color_alter is None:
tha.color_alter = tha.color_main
tha.base_width = tha.base_pen.widthF() + 0.000001
self._th_attribs[theme_state] = tha
def update_line_gradient(self):
pos_top = self.boundingRect().top()
pos_bot = self.boundingRect().bottom()
if self.ready_to_disc:
tha = self._th_attribs[_ThemeState.DISCONNECTING]
elif self._item1.isSelected() or self._item2.isSelected():
tha = self._th_attribs[_ThemeState.SELECTED]
else:
tha = self._th_attribs[_ThemeState.NORMAL]
has_gradient = bool(tha.color_main != tha.color_alter)
if has_gradient:
port_gradient = QLinearGradient(0, pos_top, 0, pos_bot)
if self.ready_to_disc:
port_gradient.setColorAt(0.0, tha.color_main)
port_gradient.setColorAt(1.0, tha.color_main)
else:
if tha.color_alter is None:
raise Exception
if self._semi_hidden:
shd = options.semi_hide_opacity
bgcolor = canvas.theme.scene_background_color
color_main = QColor(
int(tha.color_main.red() * shd + bgcolor.red() * (1.0 - shd) + 0.5),
int(tha.color_main.green() * shd + bgcolor.green() * (1.0 - shd)+ 0.5),
int(tha.color_main.blue() * shd + bgcolor.blue() * (1.0 - shd) + 0.5),
tha.color_main.alpha())
color_alter = QColor(
int(tha.color_alter.red() * shd + bgcolor.red() * (1.0 - shd) + 0.5),
int(tha.color_alter.green() * shd + bgcolor.green() * (1.0 - shd)+ 0.5),
int(tha.color_alter.blue() * shd + bgcolor.blue() * (1.0 - shd) + 0.5),
tha.color_alter.alpha())
else:
color_main, color_alter = tha.color_main, tha.color_alter
port_gradient.setColorAt(0.0, color_main)
port_gradient.setColorAt(0.5, color_alter)
port_gradient.setColorAt(1.0, color_main)
self.setPen(QPen(port_gradient, tha.base_width, Qt.PenStyle.SolidLine, Qt.PenCapStyle.FlatCap))
else:
if self._semi_hidden:
shd = options.semi_hide_opacity
bgcolor = canvas.theme.scene_background_color
color_main = QColor(
int(tha.color_main.red() * shd + bgcolor.red() * (1.0 - shd) + 0.5),
int(tha.color_main.green() * shd + bgcolor.green() * (1.0 - shd)+ 0.5),
int(tha.color_main.blue() * shd + bgcolor.blue() * (1.0 - shd) + 0.5),
tha.color_main.alpha())
else:
color_main = tha.color_main
pen = QPen(QBrush(color_main), tha.base_width, Qt.PenStyle.SolidLine, Qt.PenCapStyle.FlatCap)
pen.setCosmetic(True)
self.setPen(pen)
def paint(self, painter, option, widget):
return
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