[code] Set Layer Colors menu command example

An example that creates two menu commands at the bottom of the “View” menu.
It sets all layers whose name begins with “Demo” to red, “New” to gray, and any others to white.

It saves the previous color settings, and adds a complimentary command to reset the layer colors back to previous.

EDIT: But,… this can add a bunch of undo operations to the undo stack.
See the next post, for an example that wraps the commands in named undo operations.

Example without undoable operations (click to expand...)
# encoding: UTF-8
#
# "Set Demo Layer Colors" & "Reset Layer Colors" commands.
#
# A SketchUp menu command example by Dan Rathbun. 2021-07-14

module User # <<<---<<<< Change to YOUR unique toplevel namespace

  module DemoLayerColors

    if !defined?(@loaded)
  
      UI.menu("View").add_separator

      UI.menu("View").add_item("Set Demo Layer Colors") {
        for i in Sketchup.active_model.layers.to_a
          if i.name.start_with?("Demo")
            hue = Sketchup::Color.new("Red")
          elsif i.name.start_with?("New")
            hue = Sketchup::Color.new("Gray")
          else
            hue = Sketchup::Color.new("White")
          end
          props = i.attribute_dictionary("Properties")
          ca = i.get_attribute("Properties","Color") rescue nil
          if !props || ca.nil? || ca != hue.to_a
            i.set_attribute("Properties","Color",i.color.to_a)
          end
          i.color = hue
        end
      }

      UI.menu("View").add_item("Reset Layer Colors") {
        for i in Sketchup.active_model.layers.to_a
          ca = i.get_attribute("Properties","Color") rescue nil
          i.color = Sketchup::Color::new(ca) if ca
        end
      }

      @loaded = true
    end # if not already loaded

  end # extension submodule

end # top level namespace module

The first example (above) can add a bunch of undo operations to the undo stack.
This example wraps the commands in named undo operations.

set_demo_layer_colors_undoable.rb (1.7 KB)

# encoding: UTF-8
#
# "Set Demo Layer Colors" & "Reset Layer Colors" commands.
#
# A SketchUp menu command example by Dan Rathbun. 2021-07-14
# This edition wraps the commands in undo operation blocks.

module User # <<<---<<<< Change to YOUR unique toplevel namespace

  module DemoLayerColors

    if !defined?(@loaded)

      UI.menu("View").add_separator

      UI.menu("View").add_item("Set Demo Layer Colors") {
        Sketchup.active_model.start_operation("Demo Layer Colors",true)
          #
          for i in Sketchup.active_model.layers.to_a
            if i.name.start_with?("Demo")
              hue = Sketchup::Color.new("Red")
            elsif i.name.start_with?("New")
              hue = Sketchup::Color.new("Gray")
            else
              hue = Sketchup::Color.new("White")
            end
            props = i.attribute_dictionary("Properties")
            ca = i.get_attribute("Properties","Color") rescue nil
            if !props || ca.nil? || ca != hue.to_a
              i.set_attribute("Properties","Color",i.color.to_a)
            end
            i.color = hue
          end
          #
        Sketchup.active_model.commit_operation
      }

      UI.menu("View").add_item("Reset Layer Colors") {
        Sketchup.active_model.start_operation("Reset Layer Colors",true)
          #
          for i in Sketchup.active_model.layers.to_a
            ca = i.get_attribute("Properties","Color") rescue nil
            i.color = Sketchup::Color::new(ca) if ca
          end
          #
        Sketchup.active_model.commit_operation
      }

      @loaded = true
    end # if not already loaded

  end # extension submodule

end # top level namespace module

EDITS:

(click to expand ...)
  1. The above files had a conditional:

    if $LOADED_FEATURES !~ /#{__FILE__}/i
    

    which should be:

    if $LOADED_FEATURES.grep(/\A#{__FILE__}\z/i).empty?
    
  2. [2021-07-14] The $LOADED_FEATURES conditional test was removed and replaced with a internal conditional block using a @loaded variable. (This should be faster loading.)

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