From 63ff5690ff7a1feb80c4ea2467004c2caa38a08b Mon Sep 17 00:00:00 2001
From: penguindark <57967770+penguindark@users.noreply.github.com>
Date: Wed, 1 Sep 2021 08:21:27 +0200
Subject: [PATCH] sokol.sapp,gg: add support for drag & drop events (#11359)

---
 vlib/gg/gg.c.v                 |  4 ++++
 vlib/gg/gg.v                   |  4 ++++
 vlib/sokol/sapp/enums.v        |  1 +
 vlib/sokol/sapp/sapp.c.v       | 12 ++++++++++++
 vlib/sokol/sapp/sapp_funcs.c.v |  6 ++++++
 5 files changed, 27 insertions(+)

diff --git a/vlib/gg/gg.c.v b/vlib/gg/gg.c.v
index f6956e60ef..c9869d676f 100644
--- a/vlib/gg/gg.c.v
+++ b/vlib/gg/gg.c.v
@@ -194,6 +194,10 @@ pub fn new_context(cfg Config) &Context {
 		high_dpi: true
 		fullscreen: cfg.fullscreen
 		__v_native_render: cfg.native_rendering
+		// drag&drop
+		enable_dragndrop: cfg.enable_dragndrop
+		max_dropped_files: cfg.max_dropped_files
+		max_dropped_file_path_length: cfg.max_dropped_file_path_length
 	}
 	g.window = window
 	return g
diff --git a/vlib/gg/gg.v b/vlib/gg/gg.v
index d1dbaa4507..d6c466370b 100644
--- a/vlib/gg/gg.v
+++ b/vlib/gg/gg.v
@@ -77,6 +77,10 @@ pub:
 	font_bytes_mono   []byte
 	font_bytes_italic []byte
 	native_rendering  bool // Cocoa on macOS/iOS, GDI+ on Windows
+	// drag&drop
+	enable_dragndrop             bool // enable file dropping (drag'n'drop), default is false
+	max_dropped_files            int = 1 // max number of dropped files to process (default: 1)
+	max_dropped_file_path_length int = 2048 // max length in bytes of a dropped UTF-8 file path (default: 2048)
 }
 
 pub struct PenConfig {
diff --git a/vlib/sokol/sapp/enums.v b/vlib/sokol/sapp/enums.v
index 8e0efd796d..14f2d4c6f3 100644
--- a/vlib/sokol/sapp/enums.v
+++ b/vlib/sokol/sapp/enums.v
@@ -23,6 +23,7 @@ pub enum EventType {
 	update_cursor
 	quit_requested
 	clipboard_pasted
+	files_droped
 	num
 }
 
diff --git a/vlib/sokol/sapp/sapp.c.v b/vlib/sokol/sapp/sapp.c.v
index 28b756248f..fc8d00f286 100644
--- a/vlib/sokol/sapp/sapp.c.v
+++ b/vlib/sokol/sapp/sapp.c.v
@@ -245,3 +245,15 @@ pub fn toggle_fullscreen() {
 pub fn is_fullscreen() bool {
 	return C.sapp_is_fullscreen()
 }
+
+[inline]
+pub fn get_num_dropped_files() int {
+	return C.sapp_get_num_dropped_files()
+}
+
+[inline]
+pub fn get_dropped_file_path(index int) string {
+	unsafe {
+		return cstring_to_vstring(C.sapp_get_dropped_file_path(index))
+	}
+}
diff --git a/vlib/sokol/sapp/sapp_funcs.c.v b/vlib/sokol/sapp/sapp_funcs.c.v
index 3d177bda33..85531a6135 100644
--- a/vlib/sokol/sapp/sapp_funcs.c.v
+++ b/vlib/sokol/sapp/sapp_funcs.c.v
@@ -109,3 +109,9 @@ fn C.sapp_toggle_fullscreen()
 
 // Check if full screen rendering
 fn C.sapp_is_fullscreen() bool
+
+// Get number of droped files
+fn C.sapp_get_num_dropped_files() int
+
+// Get the file path of the droped file
+fn C.sapp_get_dropped_file_path(int) &byte