Implement ANM-9

colorbleed/maya/__init__.py

@@ -55,10 +55,29 @@ def on_init(_):
             log.warning("Can't load plug-in: "
                         "{0} - {1}".format(plugin, e))
 
+    def safe_deferred(fn):
+        """Execute deferred the function in a try-except"""
+
+        def _fn():
+            """safely call in deferred callback"""
+            try:
+                fn()
+            except Exception as exc:
+                print(exc)
+
+        try:
+            utils.executeDeferred(_fn)
+        except Exception as exc:
+            print(exc)
+
+
     cmds.loadPlugin("AbcImport", quiet=True)
     cmds.loadPlugin("AbcExport", quiet=True)
     force_load_deferred("mtoa")
 
+    from .customize import override_component_mask_commands
+    safe_deferred(override_component_mask_commands)
+
 
 def on_save(_):
     """Automatically add IDs to new nodes

colorbleed/maya/customize.py

@@ -0,0 +1,66 @@
+"""A set of commands that install overrides to Maya's UI"""
+
+import maya.cmds as mc
+import maya.mel as mel
+from functools import partial
+import logging
+
+
+log = logging.getLogger(__name__)
+
+COMPONENT_MASK_ORIGINAL = {}
+
+
+def override_component_mask_commands():
+    """Override component mask ctrl+click behavior.
+
+    This implements special behavior for Maya's component
+    mask menu items where a ctrl+click will instantly make
+    it a isolated behavior disabling all others.
+    
+    Tested in Maya 2016 and 2018.1
+
+    """
+    log.info("Installing override_component_mask_commands..")
+
+    BUTTONS = mc.formLayout("objectMaskIcons",
+                            query=True,
+                            childArray=True)
+    # Skip the triangle list item
+    BUTTONS = [btn for btn in BUTTONS if btn != "objPickMenuLayout"]
+
+    def _on_changed_callback(original, state):
+        """New callback"""
+
+        # If "control" is held force the toggled one to on and
+        # toggle the others based on whether any of the buttons
+        # was remaining active after the toggle, if not then
+        # enable all
+        if mc.getModifiers() == 4:  # = CTRL
+            state = True
+            active = [mc.iconTextCheckBox(btn, query=True, value=True) for btn
+                      in BUTTONS]
+            if any(active):
+                mc.selectType(allObjects=False)
+            else:
+                mc.selectType(allObjects=True)
+
+        # Replace #1 with the current button state
+        cmd = original.replace(" #1", " {}".format(int(state)))
+        mel.eval(cmd)
+
+    # Get all component mask buttons
+    for btn in BUTTONS:
+
+        # Store a reference to the original command so that if
+        # we rerun this override command it doesn't recursively
+        # try to implement the fix. (This also allows us to
+        # "uninstall" the behavior later)
+        if btn not in COMPONENT_MASK_ORIGINAL:
+            original = mc.iconTextCheckBox(btn, query=True, cc=True)
+            COMPONENT_MASK_ORIGINAL[btn] = original
+
+        # Assign the special callback
+        original = COMPONENT_MASK_ORIGINAL[btn]
+        new_fn = partial(_on_changed_callback, original)
+        mc.iconTextCheckBox(btn, edit=True, cc=new_fn)