Keymap: add user-prefs to the default keyconfig

Currently the only option is to use select-all as a toggle.

release/scripts/presets/keyconfig/blender.py

@@ -1,22 +1,55 @@
 import os
 import bpy
+from bpy.props import (
+    BoolProperty,
+)
 
 userpref = bpy.context.user_preferences
 
+idname = os.path.splitext(os.path.basename(__file__))[0]
+
+def update(_self, _context):
+    _load()
+
+
+class Prefs(bpy.types.KeyConfigPreferences):
+    bl_idname = idname
+
+    use_select_all_toggle: BoolProperty(
+        name="Select All Toggles",
+        description=(
+            "Causes select-all (A-key) to de-select in the case a selection exists"
+        ),
+        default=False,
+        update=update,
+    )
+
+    def draw(self, layout):
+        row = layout.row()
+        row.prop(self, "use_select_all_toggle")
+
+
 from bpy_extras.keyconfig_utils import (
-    keyconfig_import_from_data,
+    keyconfig_init_from_data,
     keyconfig_module_from_preset,
 )
 
-_mod = keyconfig_module_from_preset(os.path.join("keymap_data", "blender_default"), __file__)
-keyconfig_data = _mod.generate_keymaps(
-    _mod.KeymapParams(
-        select_mouse=userpref.inputs.select_mouse,
-    ),
-)
+mod = keyconfig_module_from_preset(os.path.join("keymap_data", "blender_default"), __file__)
+
+def _load():
+    kc = bpy.context.window_manager.keyconfigs.new(idname)
+    kc_prefs = kc.preferences
+
+    keyconfig_data = mod.generate_keymaps(
+        mod.KeymapParams(
+            select_mouse=userpref.inputs.select_mouse,
+            use_select_all_toggle=kc_prefs.use_select_all_toggle,
+        ),
+    )
+    keyconfig_init_from_data(kc, keyconfig_data)
+    kc.has_select_mouse = True  # Support switching select mouse
 
-idname = os.path.splitext(os.path.basename(__file__))[0]
 
 if __name__ == "__main__":
-    kc = keyconfig_import_from_data(idname, keyconfig_data)
-    kc.has_select_mouse = True  # Support switching select mouse
+    bpy.utils.register_class(Prefs)
+    _load()