GPencil: Hide Brush panels for some tools

Some tools don't use brush and the panel must be hidden.

Reviewed By: mendio

Differential Revision: https://developer.blender.org/D11518

release/scripts/startup/bl_ui/space_view3d_toolbar.py

@@ -1322,6 +1322,14 @@ class VIEW3D_PT_tools_particlemode_options_display(View3DPanel, Panel):
 
 # Grease Pencil drawing brushes
 
+def tool_use_brush(context):
+    from bl_ui.space_toolsystem_common import ToolSelectPanelHelper
+    tool = ToolSelectPanelHelper.tool_active_from_context(context)
+    if tool and tool.has_datablock is False:
+        return False
+
+    return True
+
 
 class GreasePencilPaintPanel:
     bl_context = ".greasepencil_paint"
@@ -1333,6 +1341,10 @@ class GreasePencilPaintPanel:
             if context.gpencil_data is None:
                 return False
 
+            # Hide for tools not using bruhses
+            if tool_use_brush(context) is False:
+                return False
+
             gpd = context.gpencil_data
             return bool(gpd.is_stroke_paint_mode)
         else:
@@ -1718,9 +1730,14 @@ class VIEW3D_PT_tools_grease_pencil_brush_paint_falloff(GreasePencilBrushFalloff
         if brush is None:
             return False
 
-        tool = brush.gpencil_tool
+        from bl_ui.space_toolsystem_common import ToolSelectPanelHelper
+        tool = ToolSelectPanelHelper.tool_active_from_context(context)
+        if tool and tool.idname  != 'builtin_brush.Tint':
+            return False
 
-        return (settings and settings.brush and settings.brush.curve and tool == 'TINT')
+        gptool = brush.gpencil_tool
+
+        return (settings and settings.brush and settings.brush.curve and gptool == 'TINT')
 
 
 # Grease Pencil stroke sculpting tools
@@ -2039,6 +2056,11 @@ class VIEW3D_PT_tools_grease_pencil_brush_mixcolor(View3DPanel, Panel):
         if context.region.type == 'TOOL_HEADER':
             return False
 
+        from bl_ui.space_toolsystem_common import ToolSelectPanelHelper
+        tool = ToolSelectPanelHelper.tool_active_from_context(context)
+        if tool and tool.idname in('builtin.cutter', 'builtin.eyedropper', 'builtin.interpolate'):
+            return False
+
         if brush.gpencil_tool == 'TINT':
             return True
 
@@ -2095,6 +2117,11 @@ class VIEW3D_PT_tools_grease_pencil_brush_mix_palette(View3DPanel, Panel):
         if ob is None or brush is None:
             return False
 
+        from bl_ui.space_toolsystem_common import ToolSelectPanelHelper
+        tool = ToolSelectPanelHelper.tool_active_from_context(context)
+        if tool and tool.idname in('builtin.cutter', 'builtin.eyedropper', 'builtin.interpolate'):
+            return False
+
         if brush.gpencil_tool == 'TINT':
             return True