examples: add a gg drag'n'drop example (#11403)

pull/8802/head^2
penguindark 2021-09-05 15:14:38 +02:00 committed by GitHub
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module main
import os
import gg
import gx
import sokol.sapp
const (
max_files = 12
text = 'Drag&Drop here max $max_files files.'
text_size = 16
)
struct App {
mut:
gg &gg.Context
dropped_file_list []string = []string{}
}
fn main() {
mut font_path := os.resource_abs_path(os.join_path('../assets/fonts/', 'RobotoMono-Regular.ttf'))
mut app := &App{
gg: 0
}
app.gg = gg.new_context(
bg_color: gx.rgb(174, 198, 255)
width: 600
height: 400
window_title: 'Drag and drop'
frame_fn: frame
font_path: font_path
user_data: app
event_fn: my_event_manager
// drag & drop
enable_dragndrop: true
max_dropped_files: max_files
max_dropped_file_path_length: 2048
)
app.gg.run()
}
fn my_event_manager(mut ev gg.Event, mut app App) {
// drag&drop event
if ev.typ == .files_droped {
num_dropped := sapp.get_num_dropped_files()
app.dropped_file_list.clear()
for i in 0 .. num_dropped {
app.dropped_file_list << sapp.get_dropped_file_path(i)
}
}
}
fn frame(mut app App) {
app.gg.begin()
mut txt_conf := gx.TextCfg{
color: gx.black
align: .left
size: int(text_size * app.gg.scale + 0.5)
}
app.gg.draw_text(12, 12, text, txt_conf)
mut y := 40
for c, f in app.dropped_file_list {
app.gg.draw_text(12, y, '[$c] $f', txt_conf)
y += text_size
}
app.gg.end()
}