Glimmer DSL for SWT File Drag and Drop

The Hello, Drag and Drop! sample included in Glimmer DSL for SWT has been enhanced with various different types of drag and drop in v4.21.2.2, including File Drag and Drop (files coming from outside the application).

	# From: https://github.com/AndyObtiva/glimmer-dsl-swt/blob/master/docs/reference/GLIMMER_SAMPLES.md#hello-drag-and-drop
	require 'glimmer-dsl-swt'
	class Location
	attr_accessor :country
	def country_options
	%w[USA Canada Mexico Columbia UK Australia Germany Italy Spain]
	end
	end
	@location = Location.new
	include Glimmer
	shell {
	text 'Hello, Drag and Drop!'
	tab_folder {
	tab_item {
	fill_layout
	text 'List'
	list {
	selection <=> [@location, :country]
	# Option 1: Automatic Drag Data Setting
	drag_source true
	# Option 2: Manual Drag Data Setting
	# on_drag_set_data do |event|
	# drag_widget = event.widget.control
	# event.data = drag_widget.selection.first
	# end
	# Option 3: Full Customization of Drag Source (details at: https://www.eclipse.org/articles/Article-SWT-DND/DND-in-SWT.html)
	# drag_source(:drop_copy) { # options: :drop_copy, :drop_link, :drop_move, :drop_target_move
	# transfer :text # options: :text, :file, :rtf
	#
	# on_drag_start do |event|
	# drag_widget = event.widget.control.data('proxy') # obtain Glimmer widget proxy since it permits nicer syntax for setting cursor via symbol
	# drag_widget.cursor = :wait
	# end
	#
	# on_drag_set_data do |event|
	# drag_widget = event.widget.control
	# event.data = drag_widget.selection.first
	# end
	#
	# on_drag_finished do |event|
	# drag_widget = event.widget.control.data('proxy') # obtain Glimmer widget proxy since it permits nicer syntax for setting cursor via symbol
	# drag_widget.cursor = :arrow
	# end
	# }
	}
	list {
	# Option 1: Automatic Drop Data Consumption
	drop_target true
	# drop_target :unique # setting drop_target to :unique makes the list not add the same data twice
	# Option 2: Manual Drop Data Consumption
	# on_drop do |event|
	# drop_widget = event.widget.control
	# drop_widget.add(event.data)
	# drop_widget.select(drop_widget.items.count - 1)
	# end
	# Option 3: Full Customization of Drop Target (details at: https://www.eclipse.org/articles/Article-SWT-DND/DND-in-SWT.html)
	# drop_target(:drop_copy) { # options: :drop_copy, :drop_link, :drop_move, :drop_target_move
	# transfer :text # options: :text, :file, :rtf
	#
	# on_drag_enter do |event|
	# ### event.detail = DND::DROP_NONE # To reject a drop, you can set event.detail to DND::DROP_NONE
	# drop_widget = event.widget.control.data('proxy') # obtain Glimmer widget proxy since it permits nicer syntax for setting background via symbol
	# drop_widget.background = :red
	# end
	#
	# on_drag_leave do |event|
	# drop_widget = event.widget.control.data('proxy') # obtain Glimmer widget proxy since it permits nicer syntax for setting background via symbol
	# drop_widget.background = :white
	# end
	#
	# on_drop do |event|
	# drop_widget = event.widget.control.data('proxy') # obtain Glimmer widget proxy since it permits nicer syntax for setting background/cursor via symbol
	# drop_widget.background = :white
	# drop_widget.add(event.data)
	# drop_widget.select(drop_widget.items.count - 1)
	# drop_widget.cursor = :arrow
	# end
	# }
	}
	}
	tab_item {
	grid_layout 2, true
	text 'Label'
	label {
	layout_data {
	horizontal_span 2
	}
	text 'Drag text from any label and drop it unto another label'
	}
	{
	Argentina: :green,
	Brazil: :red,
	Finland: :yellow,
	Sweden: :magenta,
	Denmark: :gray,
	Iceland: :cyan
	}.each do |country, color|
	label {
	layout_data :fill, :fill, true, true
	text country
	font height: 20
	background color
	drag_source true
	drop_target true
	}
	end
	}
	tab_item {
	grid_layout 2, true
	text 'Text'
	label {
	text 'Drag'
	}
	label {
	text 'Drop To Insert'
	}
	text {
	layout_data :fill, :center, true, false
	text 'Text1'
	drag_source true
	}
	text {
	layout_data :fill, :center, true, false
	text 'Drop To Insert'
	drop_target true
	}
	label {
	text 'Drag'
	}
	label {
	text 'Drop To Replace'
	}
	text {
	layout_data :fill, :center, true, false
	text 'Text2'
	drag_source true
	}
	text {
	layout_data :fill, :center, true, false
	text 'Drop To Replace'
	drop_target :replace
	}
	}
	tab_item {
	grid_layout 2, true
	text 'Spinner'
	label {
	text 'Drag'
	}
	label {
	text 'Drop To Insert'
	}
	spinner {
	layout_data :fill, :center, true, false
	selection 30
	drag_source true
	}
	spinner {
	layout_data :fill, :center, true, false
	drop_target true
	}
	}
	tab_item {
	fill_layout
	text 'File'
	@drop_zone_label = label(:center, :wrap) {
	text 'Drop One File Or More Here'
	background :white
	rectangle {
	foreground :black
	line_width 4
	line_style :dash
	}
	drop_target(:drop_copy) {
	transfer :file
	on_drag_enter do |event|
	drop_widget = event.widget.control.data('proxy') # obtain Glimmer widget proxy since it permits nicer syntax for setting background via symbol
	drop_widget.background = :yellow
	end
	on_drag_leave do |event|
	drop_widget = event.widget.control.data('proxy') # obtain Glimmer widget proxy since it permits nicer syntax for setting background via symbol
	drop_widget.background = :white
	end
	on_drop do |event|
	drop_widget = event.widget.control.data('proxy') # obtain Glimmer widget proxy since it permits nicer syntax for setting background/cursor via symbol
	drop_widget.background = :white
	@drop_zone_label.text = event.data.to_a.join("\n")
	end
	}
	}
	}
	}
	}.open

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Happy Glimmering!