Merge pull request #9 from ue4plugins/gpltech

Merging all updates from Gpltech for official release

Author: ryanmayeda

.flake8

@@ -0,0 +1,44 @@
+# Flake 8 PEP and lint configuration - https://gitlab.com/pycqa/flake8
+#
+# This defines the official lint and PEP8 rules for this repository
+#
+# You can run this locally by running 'pip install flake8' and then
+# >flake8 .
+
+[flake8]
+
+# Things we don't want to lint
+exclude =
+    .tox,
+    .git,
+    .flake8,
+    .gitignore,
+    .travis.yml,
+    .cache,
+    .eggs,
+    *.rst,
+    *.yml,
+    *.pyc,
+    *.pyo,
+    *.egg-info,
+    __pycache__,
+    # Those are our third parties, do not lint them
+    vendors,
+    # Skip __init__.py files, to not have a lot of 'xxx' imported but unused
+    python/__init__.py,
+    python/*/__init__.py,
+    # Skip the auto-generated ui file.
+    python/*/ui,
+    venv
+    winenv
+
+# Ignore some errors
+#
+# E402 module level import not at top of file
+# E501 line too long (112 > 79 characters)
+# N802 Variables should be lower case. (clashes with Qt naming conventions)
+# N806 Variables should be lower case. (clashes with Qt naming conventions)
+# W503 line break before binary operator (it breaks before, not after)
+
+ignore = E501, E402, N802, N806, W503
+

.gitignore

@@ -31,3 +31,7 @@ pip-log.txt
 
 # Max OS X Desktop Services Store files
 .DS_Store
+
+# Visual Studio
+.vs
+.vscode

.pre-commit-config.yaml

@@ -0,0 +1,35 @@
+# This file is based on templates provided and copyrighted by Autodesk, Inc.
+# This file has been modified by Epic Games, Inc. and is subject to the license
+# file included in this repository.
+
+# Styles the code properly
+# Exclude the UI files, as they are auto-generated.
+exclude: "ui\/.*py$"
+# List of super useful formatters.
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.4.0
+    hooks:
+    # Ensures the code is syntaxically correct
+    - id: check-ast
+      language_version: python3
+    # Ensures a file name will resolve on all platform
+    - id: check-case-conflict
+    # Checks files with the execute bit set have shebangs
+    - id: check-executables-have-shebangs
+    # Ensure there's no incomplete merges
+    - id: check-merge-conflict
+    # Adds an empty line if missing at the end of a file.
+    - id: end-of-file-fixer
+    # Makes sure requirements.txt is properly formatted
+    - id: requirements-txt-fixer
+    # Removes trailing whitespaces.
+    - id: trailing-whitespace
+  # Leave black at the bottom so all touchups are done before it is run.
+  - repo: https://github.com/ambv/black
+    rev: 19.10b0
+    hooks:
+    - id: black
+      language_version: python3
+
+

README.md

@@ -1,3 +1,70 @@
 ## Documentation
 
-For more information on how to run the Shotgun/Unreal integration, please see the [support documentation](https://docs.unrealengine.com/en-us/Editor/Content/Using-Unreal-Engine-with-Autodesk-Shotgun).
+This repository is a part of the ShotGrid Pipeline Toolkit/Unreal integration and contains the source code for SG TK Unreal engine.
+
+The simplest way to add the ShotGrid Toolkit integration to Unreal is to start from the available standard Shotgrid Toolkit configurations:
+- Default2 SG TK configuration: https://github.com/ue4plugins/tk-config-unreal
+- Basic SG TK configuration: https://github.com/ue4plugins/tk-config-unrealbasic
+
+However, it is possible to manually add the integration to an existing SG TK configuration from the files provided by the [default2 based Unreal config](https://github.com/ue4plugins/tk-config-unreal) or the [basic based Unreal config](https://github.com/ue4plugins/tk-config-unrealbasic).
+
+### Configuring the file system schema for a default2 base configuration
+If your SG TK configuration needs a file system schema, copy the following files and directories from `core/schema` of [this config](https://github.com/ue4plugins/tk-config-unreal) under the `core/schema` folder of your existing configuration.
+```
+schema/
+└── project
+    ├── assets
+    │   └── asset_type
+    │       └── asset
+    │           └── step
+    │               ├── publish
+    │               │   └── fbx
+    │               │       └── placeholder
+    │               └── work
+    │                   └── fbx
+    │                       └── placeholder
+    └── sequences
+        └── sequence
+            └── editorial
+                └── placeholder
+```
+
+### Adding the SG TK Unreal components
+Both configs have a self contained `env/includes/unreal` folder which contains all definitions needed by the integration
+```
+unreal/
+├── frameworks.yml
+├── settings
+│   ├── tk-multi-loader2.yml
+│   ├── tk-multi-publish2.yml
+│   ├── tk-multi-shotgunpanel.yml
+│   └── tk-unreal.yml
+├── templates.yml
+└── tk-unreal-location.yml
+```
+
+This folder should be copied to the `env/includes` folder of your existing configuration.
+
+Then the following files (or similar) need to be modified to add the Unreal integration:
+
+- *core/templates.yml*:
+  - add `include: ../env/includes/unreal/templates.yml`
+- *env/project.yml*: 
+  - add `- ./includes/unreal/settings/tk-unreal.yml` to *includes*
+  - add `tk-unreal: "@settings.tk-unreal.project"` to *engines*
+- *env/asset_step.yml*: 
+  - add `- ./includes/unreal/settings/tk-unreal.yml` to *includes*
+  - add `tk-unreal: "@settings.tk-unreal.asset_step"` to *engines*
+- *env/includes/settings/tk-maya.yml* or *env/includes/maya/asset_step.yml*:
+  - add `- ../unreal/settings/tk-multi-publish2.yml` to *includes*
+  - replace *tk-multi-publish2* asset step setting with: `tk-multi-publish2: "@settings.tk-multi-publish2.maya.asset_step.unreal"`
+- *env/includes/frameworks* or *env/includes/common/frameworks.yml*:
+  - add `include: unreal/frameworks.yml` 
+- *env/includes/settings/tk-desktop.yml* or *env/includes/desktop/project.yml*: 
+  - add "*Unreal*" to Creative Tools group.
+
+
+
+## See also:
+For more information on how to run the ShotGrid/Unreal integration, please see the [support documentation](https://docs.unrealengine.com/4.27/en-US/ProductionPipelines/UsingUnrealEnginewithAutodeskShotGrid).
+

azure-pipelines.yml

@@ -0,0 +1,27 @@
+# Python package
+# Create and test a Python package on multiple Python versions.
+# Add steps that analyze code, save the dist with the build record, publish to a PyPI-compatible index, and more:
+# https://docs.microsoft.com/azure/devops/pipelines/languages/python
+
+# The github_ci_token variable is defined in the Azure Pipeline web page as a
+# secret variable and is a github personal token.
+
+jobs:
+- job: 'Flake8'
+  pool:
+   vmImage: ubuntu-latest
+
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: 3.7
+      architecture: 'x64'
+
+  - script: |
+        python -m pip install --upgrade pip setuptools wheel
+    displayName: 'Install prerequisites'
+
+  - script: |
+        python -m pip install flake8
+        flake8 .
+    displayName: 'Run flake8'

engine.py

@@ -1,5 +1,5 @@
 # This file is based on templates provided and copyrighted by Autodesk, Inc.
-# This file has been modified by Epic Games, Inc. and is subject to the license 
+# This file has been modified by Epic Games, Inc. and is subject to the license
 # file included in this repository.
 
 """
@@ -27,21 +27,10 @@
 class UnrealEditorEngine(Engine):
     """
     Toolkit engine for Unreal.
-
-    All the methods that are present are either stubs or example of the expected functionality.
-
-    Note that when the engine starts up a log file is created at
-
-    Windows: %APPDATA%\Shotgun\logs\tk-unreal.log
-    macOS: ~/Library/Logs/Shotgun/tk-unreal.log
-    Linux: ~/.shotgun/logs/tk-unreal.log
-
-    and that all logging calls to Toolkit logging methods will be forwarded there.
-    It all uses the Python's logger under the hood.
     """
 
     metadata_tag_prefix = "SG."
-    
+
     def __init__(self, *args, **kwargs):
         """
         Engine Constructor
@@ -99,7 +88,7 @@ def pre_app_init(self):
 
         self.init_qt_app()
 
-        # Load the tk_unreal module (the Shotgun engine wrapper for Unreal)
+        # Load the tk_unreal module (the SG engine wrapper for Unreal)
         self.tk_unreal = self.import_module("tk_unreal")
         self.unreal_sg_engine = self.tk_unreal.config.wrapper_instance
 
@@ -117,19 +106,36 @@ def init_engine(self):
 
     def init_qt_app(self):
         self.logger.debug("%s: Initializing QtApp for Unreal", self)
-
         from sgtk.platform.qt5 import QtWidgets
-        
+
         if not QtWidgets.QApplication.instance():
             self._qt_app = QtWidgets.QApplication(sys.argv)
             self._qt_app.setQuitOnLastWindowClosed(False)
-            unreal.log("Created QApplication instance: {0}".format(self._qt_app))
         else:
             self._qt_app = QtWidgets.QApplication.instance()
 
+        # On other platforms than Windows, we need to process the Qt events otherwise
+        # UIs are "frozen". We use a slate tick callback to do that on a regular basis.
+        # It is not clear why this is not needed on Windows, possibly because a
+        # dedicated Windows event dispatcher is used instead of a regular
+        # QAbstractEventDispatcher
+        if sys.platform != "win32":
+            unreal.register_slate_post_tick_callback(self._process_qt_events_cb)
         # Make the QApplication use the dark theme. Must be called after the QApplication is instantiated
         self._initialize_dark_look_and_feel()
-            
+
+    @staticmethod
+    def _process_qt_events_cb(delta_time):
+        """
+        An Unreal tick callback to process QT events.
+
+        :param float delta_time: delta time since the last run.
+        """
+        from sgtk.platform.qt5 import QtWidgets
+        qapp = QtWidgets.QApplication.instance()
+        if qapp:
+            qapp.processEvents()
+
     def post_app_init(self):
         """
         Called when all apps have initialized
@@ -214,10 +220,10 @@ def destroy_engine(self):
         """
         self.logger.debug("%s: Destroying tk-unreal engine...", self)
 
-        # Close all Shotgun app dialogs that are still opened since 
+        # Close all Shotgun app dialogs that are still opened since
         # some apps do threads cleanup in their onClose event handler
         # Note that this function is called when the engine is restarted (through "Reload Engine and Apps")
-        
+
         # Important: Copy the list of dialogs still opened since the call to close() will modify created_qt_dialogs
         dialogs_still_opened = self.created_qt_dialogs[:]
 
@@ -229,7 +235,7 @@ def get_metadata_tag(self, tag):
         Returns the given tag with the metadata tag prefix defined for this engine
         """
         return UnrealEditorEngine.metadata_tag_prefix + tag
-        
+
     def _get_dialog_parent(self):
         """
         Get the QWidget parent for all dialogs created through
@@ -259,17 +265,18 @@ def _create_dialog(self, title, bundle, widget, parent):
         Function override to set the window icon
         """
         dialog = sgtk.platform.Engine._create_dialog(self, title, bundle, widget, parent)
-        
+
         from sgtk.platform.qt import QtGui
 
-        unreal_icon = os.path.realpath(os.path.join(
-            os.path.dirname(__file__),
-            "icon_256.png"))
-            
+        unreal_icon = os.path.realpath(
+            os.path.join(
+                os.path.dirname(__file__),
+                "icon_256.png"
+            )
+        )
         dialog.setWindowIcon(QtGui.QIcon(unreal_icon))
-
         return dialog
-        
+
     def _define_qt_base(self):
         """
         This will be called at initialisation time and will allow