Copy alt to clipboard when running natively

main.js

@@ -14,6 +14,8 @@ let schedule = {
 
 const offlineTitle = 'OFFLINE';
 const offlineSubtitle = 'takin a nap';
+
+let altText;
 let copyClipboard;
 let saveImage;
 
@@ -91,7 +93,7 @@ function loadSchedule() {
     schedule = JSON.parse(atob(saved));
 }
 
-function altText() {
+function generateAltText() {
     let altText = "ari melody LIVE schedule: ";
 
     const activeDays = Object.keys(schedule.days)
@@ -113,9 +115,11 @@ function altText() {
             altText += `, `;
     }
 
-    alert(altText);
+    return altText;
 }
 
+altText = () => alert(generateAltText());
+
 if ('webkit' in window && 'messageHandlers' in window.webkit) {
     let _promiseId = 0;
     let _promises = new Map();
@@ -136,6 +140,17 @@ if ('webkit' in window && 'messageHandlers' in window.webkit) {
         reject();
     });
 
+    altText = () => new Promise((resolve, reject) => {
+        const thisPromiseId = ++_promiseId;
+
+        _promises.set(thisPromiseId, [resolve, reject]);
+
+        window.webkit.messageHandlers.altText.postMessage([
+            thisPromiseId,
+            generateAltText(),
+        ]);
+    });
+
     copyClipboard = () => new Promise((resolve, reject) => {
         const thisPromiseId = ++_promiseId;
 

native/src/ls-web-view.c

@@ -20,9 +20,12 @@ static void ls_web_view_init(LSWebView *self) {}
 
 static void ls_web_view_on_resource_request(WebKitURISchemeRequest *request,
                                             gpointer                user_data);
-static void ls_web_view_on_snapshot_message_received(WebKitUserContentManager *manager,
+static void ls_web_view_on_alt_text_message_received(WebKitUserContentManager *manager,
                                                      JSCValue                 *value,
                                                      gpointer                  user_data);
+static void ls_web_view_on_copy_snapshot_message_received(WebKitUserContentManager *manager,
+                                                     JSCValue                      *value,
+                                                     gpointer                       user_data);
 
 static void ls_web_view_constructed(GObject *object) {
   G_OBJECT_CLASS(ls_web_view_parent_class)->constructed(object);
@@ -38,10 +41,14 @@ static void ls_web_view_constructed(GObject *object) {
   webkit_settings_set_enable_developer_extras(settings, TRUE);
 
   WebKitUserContentManager *manager = webkit_web_view_get_user_content_manager(web_view);
+
+  webkit_user_content_manager_register_script_message_handler(manager, "altText", NULL);
+  g_signal_connect(manager, "script-message-received::altText",
+                   G_CALLBACK(ls_web_view_on_alt_text_message_received), object);
+
   webkit_user_content_manager_register_script_message_handler(manager, "copySnapshot", NULL);
   g_signal_connect(manager, "script-message-received::copySnapshot",
-                   G_CALLBACK(ls_web_view_on_snapshot_message_received),
+                   G_CALLBACK(ls_web_view_on_copy_snapshot_message_received), object);
-                   g_object_ref(object));
 
   webkit_web_view_load_uri(web_view, "gresource:///space/arimelody/LiveSchedule/webview/index.html");
 }
@@ -203,17 +210,41 @@ static void ls_web_view_copy_snapshot_to_file(void *user_data) {
                        ls_web_view_copy_snapshot_to_file_after_save_dialog, user_data);
 }
 
-static void ls_web_view_on_snapshot_message_received(WebKitUserContentManager *manager,
+static void ls_web_view_on_alt_text_message_received(WebKitUserContentManager *manager,
                                                      JSCValue                 *value,
                                                      gpointer                  user_data)
 {
-  JSCValue *id_val = jsc_value_object_get_property_at_index(value, 0);
+  JSCValue *callback_id_val = jsc_value_object_get_property_at_index(value, 0);
+  JSCValue *alt_text_val = jsc_value_object_get_property_at_index(value, 1);
+  int callback_id = jsc_value_to_int32(callback_id_val);
+  char *alt_text = jsc_value_to_string(alt_text_val);
+
+  GdkClipboard *clipboard = gdk_display_get_clipboard(gdk_display_get_default());
+  gdk_clipboard_set_text(clipboard, alt_text);
+
+  LSWebView *self = LS_WEB_VIEW(user_data);
+
+  WebKitUserMessage *message =
+    webkit_user_message_new("_nativePromiseResolve", g_variant_new("(i)", callback_id));
+
+  webkit_web_view_send_message_to_page(WEBKIT_WEB_VIEW(self), message, NULL, NULL, NULL);
+
+  g_object_unref(callback_id_val);
+  g_object_unref(alt_text_val);
+  g_free(alt_text);
+}
+
+static void ls_web_view_on_copy_snapshot_message_received(WebKitUserContentManager *manager,
+                                                          JSCValue                 *value,
+                                                          gpointer                  user_data)
+{
+  JSCValue *callback_id_val = jsc_value_object_get_property_at_index(value, 0);
   JSCValue *kind_val = jsc_value_object_get_property_at_index(value, 1);
   JSCValue *xoffset_val = jsc_value_object_get_property_at_index(value, 2);
   JSCValue *yoffset_val = jsc_value_object_get_property_at_index(value, 3);
   JSCValue *width_val = jsc_value_object_get_property_at_index(value, 4);
   JSCValue *height_val = jsc_value_object_get_property_at_index(value, 5);
-  int callback_id = jsc_value_to_int32(id_val);
+  int callback_id = jsc_value_to_int32(callback_id_val);
   char *kind = jsc_value_to_string(kind_val);
   float xoffset = (float)jsc_value_to_double(xoffset_val);
   float yoffset = (float)jsc_value_to_double(yoffset_val);
@@ -232,6 +263,7 @@ static void ls_web_view_on_snapshot_message_received(WebKitUserContentManager *m
     (struct _LSWebViewCopySnapshotUserData *)g_malloc(sizeof(struct _LSWebViewCopySnapshotUserData));
   task_user_data->self = g_object_ref(self);
   task_user_data->cancellable = g_object_ref(self->cancellable);
+  task_user_data->callback_id = callback_id;
   task_user_data->xoffset = xoffset;
   task_user_data->yoffset = yoffset;
   task_user_data->width = width;
@@ -243,7 +275,7 @@ static void ls_web_view_on_snapshot_message_received(WebKitUserContentManager *m
     g_idle_add_once(ls_web_view_copy_snapshot_to_file, task_user_data);
   }
 
-  g_object_unref(id_val);
+  g_object_unref(callback_id_val);
   g_object_unref(kind_val);
   g_object_unref(xoffset_val);
   g_object_unref(yoffset_val);