From 43797ff5906584d777245de142382052ce4921c3 Mon Sep 17 00:00:00 2001
From: Pullusb <bernou.samuel@gmail.com>
Date: Tue, 16 Mar 2021 22:52:26 +0100
Subject: [PATCH] feat: transfer materials to objects

1.0.3:

- feat: add "Append Materials To Selected" to material submenu. Append materials to other selected GP objects if there aren't there.
---
 OP_palettes.py | 40 ++++++++++++++++++++++++++++++++++++++++
 README.md      | 15 +++++++++++++++
 UI_tools.py    |  1 +
 __init__.py    |  2 +-
 4 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/OP_palettes.py b/OP_palettes.py
index b33e7cc..9f56a3b 100644
--- a/OP_palettes.py
+++ b/OP_palettes.py
@@ -243,11 +243,51 @@ class GPTB_OT_load_blend_palette(bpy.types.Operator, ImportHelper):
 
         return {"FINISHED"}
 
+
+class GPTB_OT_copy_active_to_selected_palette(bpy.types.Operator):
+    bl_idname = "gp.copy_active_to_selected_palette"
+    bl_label = "Append Materials To Selected"
+    bl_description = "Copy all the materials of the active GP objects to the material stack of all the other selected GP"
+    bl_options = {"REGISTER"} # , "INTERNAL"
+
+    # path_to_pal : bpy.props.StringProperty(name="paht to palette", description="path to the palette", default="")
+    @classmethod
+    def poll(cls, context):
+        return context.object and context.object.type == 'GPENCIL'
+
+    def execute(self, context):
+        ob = context.object
+        if not len(ob.data.materials):
+            self.report({'ERROR'}, 'No materials to transfer')
+            return {"CANCELLED"}
+
+        selection = [o for o in context.selected_objects if o.type == 'GPENCIL' and o != ob]
+
+        if not selection:
+            self.report({'ERROR'}, 'Need to have other Grease pencil objects selected to receive active object materials')
+            return {"CANCELLED"}
+
+        ct = 0
+        for o in selection:
+            for mat in ob.data.materials:
+                if mat in o.data.materials[:]:
+                    continue
+                o.data.materials.append(mat)
+                ct += 1
+        
+        if ct:
+            self.report({'INFO'}, f'{ct} Materials appended')
+        else:
+            self.report({'WARNING'}, 'All materials are already in other selected object')
+
+        return {"FINISHED"}
+
 classes = (
 GPTB_OT_load_palette,
 GPTB_OT_save_palette,
 GPTB_OT_load_default_palette,
 GPTB_OT_load_blend_palette,
+GPTB_OT_copy_active_to_selected_palette,
 )
 
 def register():
diff --git a/README.md b/README.md
index 5788ef0..526a938 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,17 @@ Also Possible to copy whole selected layers.
 
 - Auto update : you have an updater in the addon preference tabs (use the [CGcookie addon updater](https://github.com/CGCookie/blender-addon-updater))
 
+
+**Palette management**
+
+In material submenu you have mutliple new entry:
+
+- Copy Materials To Selected : copy all material to other selected GP (difference with Ctrl+L > materials is that it doesn't erase materials, only append those that are not in other's materials stack)
+
+- Load/Save Json palette : Save/load materials externally to a json file from/to the active material stack.
+
+- Load Color palette : same as the load above exept it loads directly from a blend file (all the material that the blend contains)
+
 ### Where ?
 
 Panel in sidebar : 3D view > sidebar 'N' > Gpencil
@@ -101,6 +112,10 @@ Panel in sidebar : 3D view > sidebar 'N' > Gpencil
 
 ## Changelog:
 
+1.0.3:
+
+- feat: add "Append Materials To Selected" to material submenu. Append materials to other selected GP objects if there aren't there.
+
 1.0.2:
 
 - pref: Added option to disable always remap relative on save in addon-preference
diff --git a/UI_tools.py b/UI_tools.py
index ec586db..6413c8d 100644
--- a/UI_tools.py
+++ b/UI_tools.py
@@ -316,6 +316,7 @@ def palette_manager_menu(self, context):
     layout.separator()
     prefs = get_addon_prefs()
 
+    layout.operator("gp.copy_active_to_selected_palette", text='Append Materials To Selected', icon='MATERIAL')
     layout.operator("gp.load_palette", text='Load json Palette', icon='IMPORT').filepath = prefs.palette_path
     layout.operator("gp.save_palette", text='Save json Palette', icon='EXPORT').filepath = prefs.palette_path
     layout.operator("gp.load_blend_palette", text='Load color Palette', icon='COLOR').filepath = prefs.palette_path
diff --git a/__init__.py b/__init__.py
index 7a1a1af..bf71677 100644
--- a/__init__.py
+++ b/__init__.py
@@ -15,7 +15,7 @@ bl_info = {
 "name": "GP toolbox",
 "description": "Set of tools for Grease Pencil in animation production",
 "author": "Samuel Bernou",
-"version": (1, 0, 2),
+"version": (1, 0, 3),
 "blender": (2, 91, 0),
 "location": "sidebar (N menu) > Gpencil > Toolbox / Gpencil properties",
 "warning": "",