v/examples/gg/drag_n_drop.v

module main

import gg
import sokol.sapp

const max_files = 12
const text_size = 16

struct App {
mut:
	gg                &gg.Context = unsafe { nil }
	dropped_file_list []string
}

fn main() {
	mut app := &App{}
	app.gg = gg.new_context(
		bg_color:     gg.rgb(174, 198, 255)
		width:        600
		height:       400
		window_title: 'Drag and drop'
		frame_fn:     frame
		user_data:    app
		event_fn:     my_event_manager
		// drag & drop
		enable_dragndrop:             true
		max_dropped_files:            max_files
		max_dropped_file_path_length: 2048
	)
	app.gg.run()
}

fn my_event_manager(mut ev gg.Event, mut app App) {
	// drag&drop event
	if ev.typ == .files_dropped {
		num_dropped := sapp.get_num_dropped_files()
		app.dropped_file_list.clear()
		for i in 0 .. num_dropped {
			app.dropped_file_list << sapp.get_dropped_file_path(i)
		}
	}
}

fn frame(mut app App) {
	app.gg.begin()

	mut txt_conf := gg.TextCfg{
		color: gg.black
		align: .left
		size:  int(text_size * app.gg.scale + 0.5)
	}
	app.gg.draw_text(12, 12, 'Drag&Drop here max ${max_files} files.', txt_conf)

	mut y := 40
	for c, f in app.dropped_file_list {
		app.gg.draw_text(12, y, '[${c}] ${f}', txt_conf)
		y += text_size
	}

	app.gg.end()
}