Glimmer Computed Value Data Binding Sample

hello_computed.rb

class HelloComputed
  extend Glimmer

  include_package 'org.eclipse.swt'
  include_package 'org.eclipse.swt.widgets'
  include_package 'org.eclipse.swt.layout'

  contact = Contact.new(
    first_name: "Barry",
    last_name: "McKibbin",
    year_of_birth: 1985
  )

  shell {
    text "Hello Computed"
    composite {
      layout (
        GridLayout.new(2, true).tap {|layout|
          layout.horizontalSpacing = 20
          layout.verticalSpacing = 10
        }
      )
      label {text "First &Name: "}
      text {
        text bind(contact, :first_name)
        layoutData GridData.new.tap { |data|
          data.horizontalAlignment = GridData::FILL
          data.grabExcessHorizontalSpace = true
        }
      }
      label {text "&Last Name: "}
      text {
        text bind(contact, :last_name)
        layoutData GridData.new.tap { |data|
          data.horizontalAlignment = GridData::FILL
          data.grabExcessHorizontalSpace = true
        }
      }
      label {text "&Year of Birth: "}
      text {
        text bind(contact, :year_of_birth)
        layoutData GridData.new.tap { |data|
          data.horizontalAlignment = GridData::FILL
          data.grabExcessHorizontalSpace = true
        }
      }
      label {text "Name: "}
      label {
        text bind(contact, :name, computed_by: [:first_name, :last_name])
        layoutData GridData.new.tap { |data|
          data.horizontalAlignment = GridData::FILL
          data.grabExcessHorizontalSpace = true
        }
      }
      label {text "Age: "}
      label {
        text bind(contact, :age, :fixnum, computed_by: [:year_of_birth])
        layoutData GridData.new.tap { |data|
          data.horizontalAlignment = GridData::FILL
          data.grabExcessHorizontalSpace = true
        }
      }
    }
  }.open
end