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emscripten: send drag and drop events

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This commit is contained in:
Anonymous Maarten
2024-11-22 03:25:12 +01:00
committed by Ryan C. Gordon
parent e14d939ead
commit 88926f2b73
1 changed files with 145 additions and 0 deletions
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145
src/video/emscripten/SDL_emscriptenevents.c
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@@ -26,6 +26,7 @@
#include <emscripten/html5.h>
#include <emscripten/dom_pk_codes.h>
#include "../../events/SDL_dropevents_c.h"
#include "../../events/SDL_events_c.h"
#include "../../events/SDL_keyboard_c.h"
#include "../../events/SDL_touch_c.h"
@@ -806,6 +807,144 @@ static void Emscripten_unset_pointer_event_callbacks(SDL_WindowData *data)
}, data->canvas_id);
}
// IF YOU CHANGE THIS STRUCTURE, YOU NEED TO UPDATE THE JAVASCRIPT THAT FILLS IT IN: makeDropEventCStruct, below.
typedef struct Emscripten_DropEvent
{
int x;
int y;
} Emscripten_DropEvent;
EMSCRIPTEN_KEEPALIVE void Emscripten_SendDragEvent(SDL_WindowData *window_data, const Emscripten_DropEvent *event)
{
SDL_SendDropPosition(window_data->window, event->x, event->y);
}
EMSCRIPTEN_KEEPALIVE void Emscripten_SendDragCompleteEvent(SDL_WindowData *window_data)
{
SDL_SendDropComplete(window_data->window);
}
EMSCRIPTEN_KEEPALIVE void Emscripten_SendDragTextEvent(SDL_WindowData *window_data, char *text)
{
SDL_SendDropText(window_data->window, text);
}
EMSCRIPTEN_KEEPALIVE void Emscripten_SendDragFileEvent(SDL_WindowData *window_data, char *filename)
{
SDL_SendDropFile(window_data->window, NULL, filename);
}
EM_JS_DEPS(dragndrop, "$writeArrayToMemory");
static void Emscripten_set_drag_event_callbacks(SDL_WindowData *data)
{
MAIN_THREAD_EM_ASM({
var target = document.querySelector(UTF8ToString($1));
if (target) {
var data = $0;
if (typeof(Module['SDL3']) === 'undefined') {
Module['SDL3'] = {};
}
var SDL3 = Module['SDL3'];
var makeDropEventCStruct = function(event) {
var ptr = 0;
ptr = _SDL_malloc($2);
if (ptr != 0) {
var idx = ptr >> 2;
var rect = target.getBoundingClientRect();
HEAP32[idx++] = event.clientX - rect.left;
HEAP32[idx++] = event.clientY - rect.top;
}
return ptr;
};
SDL3.eventHandlerDropDragover = function(event) {
event.preventDefault();
var d = makeDropEventCStruct(event); if (d != 0) { _Emscripten_SendDragEvent(data, d); _SDL_free(d); }
};
target.addEventListener("dragover", SDL3.eventHandlerDropDragover);
SDL3.drop_count = 0;
FS.mkdir("/tmp/filedrop");
SDL3.eventHandlerDropDrop = function(event) {
event.preventDefault();
if (event.dataTransfer.types.includes("text/plain")) {
let plain_text = stringToNewUTF8(event.dataTransfer.getData("text/plain"));
_Emscripten_SendDragTextEvent(data, plain_text);
_free(plain_text);
} else if (event.dataTransfer.types.includes("Files")) {
for (let i = 0; i < event.dataTransfer.files.length; i++) {
const file = event.dataTransfer.files.item(i);
const file_reader = new FileReader();
file_reader.readAsArrayBuffer(file);
file_reader.onload = function(event) {
const fs_dropdir = `/tmp/filedrop/${SDL3.drop_count}`;
SDL3.drop_count += 1;
const fs_filepath = `${fs_dropdir}/${file.name}`;
const c_fs_filepath = stringToNewUTF8(fs_filepath);
const contents_array8 = new Uint8Array(event.target.result);
FS.mkdir(fs_dropdir);
var stream = FS.open(fs_filepath, "w");
FS.write(stream, contents_array8, 0, contents_array8.length, 0);
FS.close(stream);
_Emscripten_SendDragFileEvent(data, c_fs_filepath);
_free(c_fs_filepath);
_Emscripten_SendDragCompleteEvent(data);
};
}
}
_Emscripten_SendDragCompleteEvent(data);
};
target.addEventListener("drop", SDL3.eventHandlerDropDrop);
SDL3.eventHandlerDropDragend = function(event) {
event.preventDefault();
_Emscripten_SendDragCompleteEvent(data);
};
target.addEventListener("dragend", SDL3.eventHandlerDropDragend);
target.addEventListener("dragleave", SDL3.eventHandlerDropDragend);
}
}, data, data->canvas_id, sizeof (Emscripten_DropEvent));
}
static void Emscripten_unset_drag_event_callbacks(SDL_WindowData *data)
{
MAIN_THREAD_EM_ASM({
var target = document.querySelector(UTF8ToString($0));
if (target) {
var SDL3 = Module['SDL3'];
target.removeEventListener("dragleave", SDL3.eventHandlerDropDragend);
target.removeEventListener("dragend", SDL3.eventHandlerDropDragend);
target.removeEventListener("drop", SDL3.eventHandlerDropDrop);
SDL3.drop_count = undefined;
function recursive_remove(dirpath) {
FS.readdir(dirpath).forEach((filename) => {
const p = `${dirpath}/${filename}`;
const p_s = FS.stat(p);
if (FS.isFile(p_s.mode)) {
FS.unlink(p);
} else if (FS.isDir(p)) {
recursive_remove(p);
}
});
FS.rmdir(dirpath);
}("/tmp/filedrop");
FS.rmdir("/tmp/filedrop");
target.removeEventListener("dragover", SDL3.eventHandlerDropDragover);
SDL3.eventHandlerDropDragover = undefined;
SDL3.eventHandlerDropDrop = undefined;
SDL3.eventHandlerDropDragend = undefined;
}
}, data->canvas_id);
}
void Emscripten_RegisterEventHandlers(SDL_WindowData *data)
{
const char *keyElement;
@@ -852,12 +991,18 @@ void Emscripten_RegisterEventHandlers(SDL_WindowData *data)
// !!! FIXME: currently Emscripten doesn't have a Pointer Events functions like emscripten_set_*_callback, but we should use those when they do:
// !!! FIXME: https://github.com/emscripten-core/emscripten/issues/7278#issuecomment-2280024621
Emscripten_set_pointer_event_callbacks(data);
// !!! FIXME: currently Emscripten doesn't have a Drop Events functions like emscripten_set_*_callback, but we should use those when they do:
Emscripten_set_drag_event_callbacks(data);
}
void Emscripten_UnregisterEventHandlers(SDL_WindowData *data)
{
const char *target;
// !!! FIXME: currently Emscripten doesn't have a Drop Events functions like emscripten_set_*_callback, but we should use those when they do:
Emscripten_unset_drag_event_callbacks(data);
// !!! FIXME: currently Emscripten doesn't have a Pointer Events functions like emscripten_set_*_callback, but we should use those when they do:
// !!! FIXME: https://github.com/emscripten-core/emscripten/issues/7278#issuecomment-2280024621
Emscripten_unset_pointer_event_callbacks(data);