Light Panel

# -*- coding: utf-8 -*-
"""
Author: Virgil
Date: 2020/5/27 19:01
"""

from PySide2 import QtCore
from PySide2 import QtGui
from PySide2 import QtWidgets
from shiboken2 import wrapInstance
from functools import partial

import maya.OpenMayaUI as omui
import maya.cmds as cmds
import maya.mel as mel

def maya_main_window():
    """
    Return the Maya main window widget as a Python object
    """
    main_window_ptr = omui.MQtUtil.mainWindow()
    return wrapInstance(long(main_window_ptr), QtWidgets.QWidget)

class CustomColorButton(QtWidgets.QWidget):
    color_changed = QtCore.Signal(QtGui.QColor)

    def __init__(self, color=QtCore.Qt.white, parent=None):
        super(CustomColorButton, self).__init__(parent)

        self.setObjectName("CustomColorButton")

        self.create_control()
        self.set_size(50, 14)
        self.set_color(color)

    def create_control(self):
        """ 1. Create the colorSliderGrp"""
        window = cmds.window()
        color_slider_name = cmds.colorSliderGrp()

        """ 2. Find the colorSliderGrp widget"""
        self._color_slider_obj = omui.MQtUtil.findControl(color_slider_name)

        if self._color_slider_obj:
            self._color_slider_widget = wrapInstance(long(self._color_slider_obj), QtWidgets.QWidget)

            """ 3. Reparent the colorSliderGrp widget to this widget"""
            main_layout = QtWidgets.QVBoxLayout(self)
            main_layout.setObjectName("main_layout")
            main_layout.setContentsMargins(0, 0, 0, 0)
            main_layout.addWidget(self._color_slider_widget)


            """ 5. Identify/store the colorSliderGrp's child widgets (and hide if necessary)"""
            # children = self._color_slider_widget.children()
            # for child in children:
            #     print(child)
            #     print(child.objectName())
            # print("--------------------")

            self._slider_widget = self._color_slider_widget.findChild(QtWidgets.QWidget, "slider")
            if self._slider_widget:
                self._slider_widget.hide()

            self._color_widget = self._color_slider_widget.findChild(QtWidgets.QWidget, "port")

            cmds.colorSliderGrp(self.get_full_name(), edit=True, changeCommand=partial(self.on_color_changed))

        cmds.deleteUI(window, window=True)

    def get_full_name(self):
        return omui.MQtUtil.fullName(long(self._color_slider_obj))

    def set_size(self, width, height):
        self._color_slider_widget.setFixedWidth(width)
        self._color_widget.setFixedHeight(height)

    def set_color(self, color):
        color = QtGui.QColor(color)

        if color != self.get_color():
            cmds.colorSliderGrp(self.get_full_name(), edit=True, rgbValue=(color.redF(), color.greenF(), color.blueF()))
            self.on_color_changed()

    def get_color(self):
        # color = cmds.colorSliderGrp(self._color_slider_widget.objectName(), query=True, rgbValue=True)
        color = cmds.colorSliderGrp(self.get_full_name(), query=True, rgbValue=True)

        color = QtGui.QColor(color[0] * 255, color[1] * 255, color[2] * 255)
        return color

    def on_color_changed(self, *args):
        self.color_changed.emit(self.get_color())


class LightItem(QtWidgets.QWidget):

    SUPPORTED_TYPES = ["ambientLight", "directionalLight", "pointLight", "spotLight"]
    EMIT_TYPES = ["directionalLight", "pointLight", "spotLight"]

    node_deleted = QtCore.Signal(str)

    def __init__(self, shape_name, parent=None):
        super(LightItem, self).__init__(parent)

        self.setFixedHeight(26)

        self.shape_name = shape_name
        self.uuid = cmds.ls(shape_name, uuid=True)

        self.script_jobs = []

        self.create_widgets()
        self.create_layout()
        self.create_connections()

        self.create_script_jobs()

    def create_widgets(self):
        self.light_type_bttn = QtWidgets.QPushButton()
        self.light_type_bttn.setFixedSize(20, 20)
        self.light_type_bttn.setFlat(True)

        self.visibility_cb = QtWidgets.QCheckBox()

        self.transform_name_label = QtWidgets.QLabel("placeholder")
        self.transform_name_label.setFixedWidth(120)
        self.transform_name_label.setAlignment(QtCore.Qt.AlignCenter)

        light_type = self.get_light_type()
        if light_type in self.SUPPORTED_TYPES:
            self.intensity_dsb = QtWidgets.QDoubleSpinBox()
            self.intensity_dsb.setRange(0.0, 100.0)
            self.intensity_dsb.setDecimals(3)
            self.intensity_dsb.setSingleStep(0.1)
            self.intensity_dsb.setButtonSymbols(QtWidgets.QAbstractSpinBox.NoButtons)

            self.color_bttn = CustomColorButton()

            if light_type in self.EMIT_TYPES:
                self.emit_diffuse_cb = QtWidgets.QCheckBox()
                self.emit_specular_cb = QtWidgets.QCheckBox()

        self.update_values()

    def create_layout(self):
        main_layout = QtWidgets.QHBoxLayout(self)
        main_layout.setContentsMargins(0, 0, 0, 0)
        main_layout.addWidget(self.light_type_bttn)
        main_layout.addWidget(self.visibility_cb)
        main_layout.addWidget(self.transform_name_label)

        light_type = self.get_light_type()
        if light_type in self.SUPPORTED_TYPES:
            main_layout.addWidget(self.intensity_dsb)
            main_layout.addSpacing(10)
            main_layout.addWidget(self.color_bttn)

            if light_type in self.EMIT_TYPES:
                main_layout.addSpacing(34)
                main_layout.addWidget(self.emit_diffuse_cb)
                main_layout.addSpacing(50)
                main_layout.addWidget(self.emit_specular_cb)

        main_layout.addStretch()

    def create_connections(self):
        self.light_type_bttn.clicked.connect(self.select_light)
        self.visibility_cb.toggled.connect(self.set_visibility)

        light_type = self.get_light_type()
        if light_type in self.SUPPORTED_TYPES:
            self.intensity_dsb.editingFinished.connect(self.on_intensity_changed)
            self.color_bttn.color_changed.connect(self.set_color)

            if light_type in self.EMIT_TYPES:
                self.emit_diffuse_cb.toggled.connect(self.set_emit_diffuse)
                self.emit_specular_cb.toggled.connect(self.set_emit_specular)

    def update_values(self):
        self.light_type_bttn.setIcon(self.get_light_type_icon())
        self.visibility_cb.setChecked(self.is_visible())
        self.transform_name_label.setText(self.get_transform_name())

        light_type = self.get_light_type()
        if light_type in self.SUPPORTED_TYPES:
            self.intensity_dsb.setValue(self.get_intensity())
            self.color_bttn.set_color(self.get_color())

            if light_type in self.EMIT_TYPES:
                self.emit_diffuse_cb.setChecked(self.emits_diffuse())
                self.emit_specular_cb.setChecked(self.emits_specular())

    def get_transform_name(self):
        return cmds.listRelatives(self.shape_name, parent=True)[0]

    def get_attribute_value(self, name, attribute):
        return cmds.getAttr("{0}.{1}".format(name, attribute))

    def set_attribute_value(self, name , attribute, *args):
        if attribute == "color":
            if self.get_color() == self.color_bttn.get_color():
                return
        elif args[0] == self.get_attribute_value(name, attribute):
            return

        attr_name = "{0}.{1}".format(name, attribute)
        cmds.setAttr(attr_name, *args)

    def get_light_type(self):
        return cmds.objectType(self.shape_name)

    def get_light_type_icon(self):
        light_type = self.get_light_type()

        icon = QtGui.QIcon()
        if light_type == "ambientLight":
            icon = QtGui.QIcon(":ambientLight.svg")
        elif light_type == "directionalLight":
            icon = QtGui.QIcon(":directionalLight.svg")
        elif light_type == "pointLight":
            icon = QtGui.QIcon(":pointLight.svg")
        elif light_type == "spotLight":
            icon = QtGui.QIcon(":spotLight.svg")
        else:
            icon = QtGui.QIcon(":Light.png")

        return icon

    def is_visible(self):
        transform_name = self.get_transform_name()
        return self.get_attribute_value(transform_name, "visibility")

    def get_intensity(self):
        return self.get_attribute_value(self.shape_name, "intensity")

    def get_color(self):
        temp_color = self.get_attribute_value(self.shape_name, "color")[0]
        return QtGui.QColor(temp_color[0] * 255, temp_color[1] * 255, temp_color[2] * 255)

    def emits_diffuse(self):
        return self.get_attribute_value(self.shape_name, "emitDiffuse")

    def emits_specular(self):
        return self.get_attribute_value(self.shape_name, "emitSpecular")

    def select_light(self):
        cmds.select(self.get_transform_name())

    def set_visibility(self, checked):
        self.set_attribute_value(self.get_transform_name(), "visibility", checked)

    def on_intensity_changed(self):
        self.set_attribute_value(self.shape_name, "intensity", self.intensity_dsb.value())

    def set_color(self, color):
        self.set_attribute_value(self.shape_name, "color", color.redF(), color.greenF(), color.blueF())

    def set_emit_diffuse(self, checked):
        self.set_attribute_value(self.shape_name, "emitDiffuse", checked)

    def set_emit_specular(self, checked):
        self.set_attribute_value(self.shape_name, "emitSpecular", checked)

    def on_node_deleted(self):
        self.node_deleted.emit(self.shape_name)

    def on_name_changed(self):
        self.shape_name = cmds.ls(self.uuid)[0]
        self.update_values()

    def create_script_jobs(self):
        self.delete_script_jobs()

        self.add_attribute_change_script_job(self.get_transform_name(), "visibility")
        light_type = self.get_light_type()
        if light_type in self.SUPPORTED_TYPES:
            self.add_attribute_change_script_job(self.shape_name, "color")
            self.add_attribute_change_script_job(self.shape_name, "intensity")

            if light_type in self.EMIT_TYPES:
                self.add_attribute_change_script_job(self.shape_name, "emitDiffuse")
                self.add_attribute_change_script_job(self.shape_name, "emitSpecular")

        self.script_jobs.append(cmds.scriptJob(nodeDeleted=(self.shape_name, partial(self.on_node_deleted))))
        self.script_jobs.append(cmds.scriptJob(nodeNameChanged=(self.shape_name, partial(self.on_name_changed))))

    def add_attribute_change_script_job(self, name, attribute):
        self.script_jobs.append(cmds.scriptJob(attributeChange=("{0}.{1}".format(name, attribute), partial(self.update_values))))

    def delete_script_jobs(self):
        for job_number in self.script_jobs:
            cmds.evalDeferred("if cmds.scriptJob(exists={0}):\tcmds.scriptJob(kill={0}, force=True)".format(job_number))

        self.script_jobs = []

class LightPanel(QtWidgets.QDialog):
    WINDOW_TITLE = "Light Panel"

    def __init__(self, parent=maya_main_window()):
        super(LightPanel, self).__init__(parent)

        self.setWindowTitle(self.WINDOW_TITLE)
        self.setMinimumSize(500, 260)
        self.setWindowFlags(self.windowFlags() ^ QtCore.Qt.WindowContextHelpButtonHint)

        self.light_items = []
        self.script_jobs = []

        self.create_widgets()
        self.create_layout()
        self.create_connections()

    def create_widgets(self):
        self.refresh_bttn = QtWidgets.QPushButton("Refresh Lights")

    def create_layout(self):
        header_layout = QtWidgets.QHBoxLayout()
        header_layout.addSpacing(100)
        header_layout.addWidget(QtWidgets.QLabel("Light"))
        header_layout.addSpacing(50)
        header_layout.addWidget(QtWidgets.QLabel("Intensity"))
        header_layout.addSpacing(44)
        header_layout.addWidget(QtWidgets.QLabel("Color"))
        header_layout.addSpacing(24)
        header_layout.addWidget(QtWidgets.QLabel("Emit Diffuse"))
        header_layout.addSpacing(10)
        header_layout.addWidget(QtWidgets.QLabel("Emit Spec"))
        header_layout.addStretch()

        bttn_layout = QtWidgets.QHBoxLayout()
        bttn_layout.addStretch()
        bttn_layout.addWidget(self.refresh_bttn)

        light_list_wdg = QtWidgets.QWidget()

        self.light_layout = QtWidgets.QVBoxLayout(light_list_wdg)
        self.light_layout.setContentsMargins(2, 2, 2, 2)
        self.light_layout.setSpacing(3)
        self.light_layout.setAlignment(QtCore.Qt.AlignTop)

        light_list_scroll_area = QtWidgets.QScrollArea()
        light_list_scroll_area.setWidgetResizable(True)
        light_list_scroll_area.setWidget(light_list_wdg)

        main_layout = QtWidgets.QVBoxLayout(self)
        main_layout.setContentsMargins(5, 5, 5, 5)
        main_layout.addLayout(header_layout)
        main_layout.addWidget(light_list_scroll_area)
        main_layout.addLayout(bttn_layout)

    def create_connections(self):
        self.refresh_bttn.clicked.connect(self.refresh_lights)

    def get_lights_in_scene(self):
        return cmds.ls(type="light")

    def refresh_lights(self):
        self.clear_lights()

        scene_lights = self.get_lights_in_scene()
        for light in scene_lights:
            light_item = LightItem(light)
            light_item.node_deleted.connect(self.on_node_deleted)

            self.light_layout.addWidget(light_item)
            self.light_items.append((light_item))

    def clear_lights(self):
        for light in self.light_items:
            light.delete_script_jobs()

        self.light_items = []

        while self.light_layout.count() > 0:
            light_item = self.light_layout.takeAt(0)
            if light_item.widget():
                light_item.widget().deleteLater()

    def create_script_jobs(self):
        self.script_jobs.append(cmds.scriptJob(event=["DagObjectCreated", partial(self.on_dag_object_created)]))
        self.script_jobs.append(cmds.scriptJob(event=["Undo", partial(self.on_undo)]))

    def delete_script_jobs(self):
        for job_number in self.script_jobs:
            cmds.scriptJob(kill=job_number)

        self.script_jobs = []

    def on_dag_object_created(self):
        if len(cmds.ls(type="light")) != len(self.light_items):
            print("New light created...")
            self.refresh_lights()

    def on_undo(self):
        if len(cmds.ls(type="light")) != len(self.light_items):
            print("Undo light created...")
            self.refresh_lights()

    def on_node_deleted(self):
        self.refresh_lights()

    def showEvent(self, event):
        self.create_script_jobs()
        self.refresh_lights()

    def closeEvent(self, event):
        self.delete_script_jobs()
        self.clear_lights()


def showWindow():
    global dialog
    try:
        dialog.close()
        dialog.deleteLater()
    except:
        pass

    dialog = LightPanel()
    dialog.show()

if __name__ == "__main__":
    try:
        dialog.close()
        dialog.deleteLater()
    except:
        pass

    dialog = LightPanel()
    dialog.show()
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