GPencil: New Eyedropper tool for Material creation.

This patch is only for the eyedropper to create materials.

Options:
Click: Create Stroke Material
Shift+Click: Create Fill Material.
Shift+Ctrl+Click: Create Stroke and Fill Material.

Toolbar:

{F7718606}

Reviewed By: brecht, mendio

Differential Revision: https://developer.blender.org/D5688

release/scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -5869,6 +5869,18 @@ def km_3d_view_tool_paint_gpencil_cutter(params):
     )
 
 
+def km_3d_view_tool_paint_gpencil_eyedropper(params):
+    return (
+        "3D View Tool: Paint Gpencil, Eyedropper",
+        {"space_type": 'VIEW_3D', "region_type": 'WINDOW'},
+        {"items": [
+            ("ui.eyedropper_gpencil_color", {"type": params.tool_mouse, "value": 'PRESS'}, None),
+            ("ui.eyedropper_gpencil_color", {"type": params.tool_mouse, "value": 'PRESS', "shift": True}, None),
+            ("ui.eyedropper_gpencil_color", {"type": params.tool_mouse, "value": 'PRESS', "shift": True, "ctrl": True}, None),
+        ]},
+    )
+
+
 def km_3d_view_tool_edit_gpencil_select(params):
     return (
         "3D View Tool: Edit Gpencil, Tweak",
@@ -6206,6 +6218,7 @@ def generate_keymaps(params=None):
         km_3d_view_tool_paint_gpencil_arc(params),
         km_3d_view_tool_paint_gpencil_curve(params),
         km_3d_view_tool_paint_gpencil_cutter(params),
+        km_3d_view_tool_paint_gpencil_eyedropper(params),
         km_3d_view_tool_edit_gpencil_select(params),
         km_3d_view_tool_edit_gpencil_select_box(params),
         km_3d_view_tool_edit_gpencil_select_circle(params),

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -1393,6 +1393,17 @@ class _defs_gpencil_paint:
         )
 
 
+    @ToolDef.from_fn
+    def eyedropper():
+        return dict(
+            idname="builtin.eyedropper",
+            label="Eyedropper",
+            icon="ops.paint.weight_sample",
+            cursor='EYEDROPPER',
+            widget=None,
+            keymap=(),
+        )
+
 class _defs_gpencil_edit:
     @ToolDef.from_fn
     def bend():
@@ -2044,6 +2055,8 @@ class VIEW3D_PT_tools_active(ToolSelectPanelHelper, Panel):
             _defs_gpencil_paint.generate_from_brushes,
             _defs_gpencil_paint.cutter,
             None,
+            _defs_gpencil_paint.eyedropper,
+            None,
             _defs_gpencil_paint.line,
             _defs_gpencil_paint.arc,
             _defs_gpencil_paint.curve,