Adding Qt Resources for Tree View icons.

CMake build system compiles Qt .rcc files to be loaded at runtime for icons.
Issue #29 and #30.

CMakeLists.txt

@@ -483,16 +483,24 @@ endif ()
 
 # Install Icons.
 if (BUILD_ICONS)
+    install(DIRECTORY "icons/"
+            DESTINATION "${MODULE_FULL_NAME}/resources"
+            FILES_MATCHING PATTERN "*.rcc"
+            PATTERN "icons/edit" EXCLUDE
+            PATTERN "icons/library" EXCLUDE
+            PATTERN "icons/ui" EXCLUDE)
     install(DIRECTORY "icons/"
             DESTINATION "${MODULE_FULL_NAME}/icons"
             FILES_MATCHING PATTERN "*.png"
             PATTERN "icons/edit" EXCLUDE
-            PATTERN "icons/library" EXCLUDE)
+            PATTERN "icons/library" EXCLUDE
+            PATTERN "icons/ui" EXCLUDE)
     install(DIRECTORY "icons/"
             DESTINATION "${MODULE_FULL_NAME}/icons"
             FILES_MATCHING PATTERN "*.svg"
             PATTERN "icons/edit" EXCLUDE
-            PATTERN "icons/library" EXCLUDE)
+            PATTERN "icons/library" EXCLUDE
+            PATTERN "icons/ui" EXCLUDE)
 endif ()
 
 
@@ -550,6 +558,10 @@ if (BUILD_DOCS)
     add_subdirectory(docs)
 endif ()
 
+if (BUILD_ICONS)
+    add_subdirectory(icons)
+endif ()
+
 if (BUILD_TESTS)
     enable_testing()
     add_subdirectory(tests)

icons/CMakeLists.txt

@@ -0,0 +1,33 @@
+# Copyright (C) 2020 David Cattermole.
+#
+# This file is part of mmSolver.
+#
+# mmSolver is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# mmSolver 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with mmSolver.  If not, see <https://www.gnu.org/licenses/>.
+# ---------------------------------------------------------------------
+#
+# Build Icons (using Qt Resource Compiler)
+
+set(input_file ${CMAKE_SOURCE_DIR}/icons/resources.qrc)
+set(output_file ${CMAKE_SOURCE_DIR}/icons/resources.rcc)
+add_custom_command(
+        OUTPUT ${output_file}
+        COMMAND rcc -binary resources.qrc -o resources.rcc
+        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/icons
+        DEPENDS ${input_file}
+)
+add_custom_target(
+        build_icons ALL
+        DEPENDS ${output_file}
+        COMMENT "Building Icons (with Qt Resource Compiler) (${input_file})..."
+)

icons/resources.qrc

@@ -0,0 +1,12 @@
+<RCC>
+  <qresource>
+    <file alias="mmSolver_attr.png">ui/mmSolver_attr.png</file>
+    <file alias="mmSolver_node.png">ui/mmSolver_node.png</file>
+    <file alias="mmSolver_plug.png">ui/mmSolver_plug.png</file>
+    <file alias="mmSolver_bundle.png">ui/mmSolver_bundle.png</file>
+    <file alias="mmSolver_marker.png">ui/mmSolver_marker.png</file>
+    <file alias="mmSolver_object.png">ui/mmSolver_object.png</file>
+    <file alias="mmSolver_camera.png">ui/mmSolver_camera.png</file>
+    <file alias="mmSolver_solverStep.png">ui/mmSolver_solverStep.png</file>
+  </qresource>
+</RCC>

modules/mayaMatchMoveSolver_windows.mod

@@ -2,6 +2,7 @@
 MMSOLVER_LOCATION :=
 MMSOLVER_CONFIG_PATH +:= config
 MMSOLVER_CONFIG_PATH += ${APPDATA}/mmSolver
+MMSOLVER_RESOURCE_PATH := resources
 MMSOLVER_LOAD_AT_STARTUP = 1
 MMSOLVER_CREATE_MENU = 1
 MMSOLVER_CREATE_SHELF = 1

python/mmSolver/tools/solver/ui/solver_window.py

@@ -19,6 +19,7 @@
 The main window for the 'Solver' tool.
 """
 
+import os
 import datetime
 import uuid
 from functools import partial
@@ -629,6 +630,28 @@ def help(self):
         return
 
 
+def loadAllResources():
+    base_install_location = os.environ.get('MMSOLVER_LOCATION', None)
+    assert base_install_location is not None
+    fallback = os.path.join(base_install_location, 'resources')
+    resource_paths = os.environ.get('MMSOLVER_RESOURCE_PATH', fallback)
+    assert isinstance(resource_paths, basestring)
+    resource_paths = resource_paths.split(os.pathsep)
+    for directory_path in resource_paths:
+        if not os.path.isdir(directory_path):
+            continue
+        file_names = os.listdir(directory_path)
+        for file_name in file_names:
+            file_path = os.path.join(directory_path, file_name)
+            if os.path.isfile(file_path):
+                is_registered = QtCore.QResource.registerResource(file_path)
+                if is_registered:
+                    LOG.info("Resource registered: %r", file_path)
+                else:
+                    LOG.warn("Resource failed to register: %r", file_path)
+    return
+
+
 def main(show=True, auto_raise=True, delete=False):
     """
     Open the Solver UI window.
@@ -650,6 +673,7 @@ def main(show=True, auto_raise=True, delete=False):
     # Force the Plug-in to load.  If the plug-in cannot load, the UI
     # will not open and an error will be given.
     lib_maya_utils.ensure_plugin_loaded()
+    loadAllResources()
 
     win = SolverWindow.open_window(
         show=show,