Add the ability for Python to pass download progress to Project Manager and to cancel downloads.

Signed-off-by: AMZN-Phil <pconroy@amazon.com>

Code/Tools/ProjectManager/Source/PythonBindings.cpp

@@ -223,6 +223,50 @@ namespace RedirectOutput
     }
 } // namespace RedirectOutput
 
+namespace O3DEProjectManagerPy
+{
+    using DownloadProgressFunc = AZStd::function<void(int)>;
+    DownloadProgressFunc currentProgressCallback;
+    bool requestCancelDownload = false;
+
+    static PyObject* CLICancelDownload(PyObject* /*self*/, PyObject* /*args*/)
+    {
+        if (requestCancelDownload)
+        {
+            return Py_True;
+        }
+        else
+        {
+            return Py_False;
+        }
+    }
+
+    static PyObject* CLIDownloadProgress(PyObject* /*self*/, PyObject* args)
+    {
+        int progress_percentage = 0;
+        if (!PyArg_ParseTuple(args, "i", &progress_percentage))
+            return NULL;
+        if (currentProgressCallback)
+        {
+            currentProgressCallback(progress_percentage);
+        }
+
+        Py_RETURN_NONE;
+    }
+
+    static PyMethodDef O3DEPMPyMethods[] = { { "download_progress", CLIDownloadProgress, METH_VARARGS, "Used to call back to the UI to inform of download progress." },
+                                             { "request_cancel_download", CLICancelDownload, METH_NOARGS, "Returns that the UI is requesting that the current download be cancelled." },
+                                             { NULL, NULL, 0, NULL } };
+
+    static PyModuleDef O3DEPMPyModule = { PyModuleDef_HEAD_INIT, "o3de_projectmanager", NULL, -1, O3DEPMPyMethods, NULL, NULL, NULL, NULL };
+
+    static PyObject* PyInit_O3DEPMPy(void)
+    {
+        return PyModule_Create(&O3DEPMPyModule);
+    }
+} // namespace O3DEProjectManagerPy
+
+
 namespace O3DE::ProjectManager
 {
     PythonBindings::PythonBindings(const AZ::IO::PathView& enginePath)
@@ -270,6 +314,7 @@ namespace O3DE::ProjectManager
         AZ_TracePrintf("python", "Py_GetProgramFullPath=%ls \n", Py_GetProgramFullPath());
 
         PyImport_AppendInittab("azlmbr_redirect", RedirectOutput::PyInit_RedirectOutput);
+        PyImport_AppendInittab("o3de_projectmanager", &O3DEProjectManagerPy::PyInit_O3DEPMPy);
 
         try
         {
@@ -1080,6 +1125,8 @@ namespace O3DE::ProjectManager
     AZ::Outcome<void, AZStd::string> PythonBindings::DownloadGem(const QString& gemName, std::function<void(int)> gemProgressCallback)
     {
         bool downloadSucceeded = false;
+        O3DEProjectManagerPy::currentProgressCallback = gemProgressCallback;
+        O3DEProjectManagerPy::requestCancelDownload = false;
         auto result = ExecuteWithLockErrorHandling(
             [&]
             {
@@ -1091,6 +1138,8 @@ namespace O3DE::ProjectManager
                 downloadSucceeded = (downloadResult.cast<int>() == 0);
             });
 
+        O3DEProjectManagerPy::currentProgressCallback = nullptr;
+
         if (!result.IsSuccess())
         {
             return result;
@@ -1102,4 +1151,9 @@ namespace O3DE::ProjectManager
 
         return AZ::Success();
     }
+
+    void PythonBindings::CancelDownload()
+    {
+        O3DEProjectManagerPy::requestCancelDownload = true;
+    }
 }