No busy indicator for downloads

CHANGES

@@ -1,3 +1,10 @@
+
+ - New optional actionCfg property "noBusyIndicator" for download and
+   display actions. When set, the modal busy indicator ("Preparing
+   Download ...") is not shown while the download is being prepared, so
+   the gui stays usable for actions which take a long time to produce
+   their data. Default behaviour is unchanged.
+
 0.58.4 2026-07-31 16:15:51 +0200 Tobias Oetiker <tobi@oetiker.ch>
 
  - Frontend ui.Login: a login could be lost outright. The credentials

lib/CallBackery/GuiPlugin/AbstractAction.pm

@@ -93,6 +93,19 @@ has screenOpts => sub {
 
 Returns a list of action buttons to place at the top of the form.
 
+For C<download> and C<display> actions the gui is blocked by a modal busy
+indicator while the download is being prepared (for at most 3 seconds).
+Actions which take a long time to produce their data can switch this off by
+setting C<noBusyIndicator> to true, keeping the gui usable while they run:
+
+ {
+     label         => trm('Create Report'),
+     action        => 'download',
+     key           => 'createReport',
+     noBusyIndicator => true,
+     actionHandler => sub { ... },
+ }
+
 =cut
 
 has actionCfg => sub {

lib/CallBackery/qooxdoo/callbackery/source/class/callbackery/ui/plugin/Action.js

@@ -401,12 +401,18 @@ qx.Class.define("callbackery.ui.plugin.Action", {
                                 return;
                             }
                             var key = btCfg.key;
-                            if (btCfg.busyMessage) {
-                                busy.manifest(this.xtr(btCfg.busyMessage));
-                            } else {
-                                busy.manifest(this.tr('Preparing Download ...'));
+                            // actions which take a long time to produce their
+                            // data can opt out of the modal busy indicator so
+                            // that the gui stays usable while they run
+                            let showBusy = !btCfg.noBusyIndicator;
+                            if (showBusy) {
+                                if (btCfg.busyMessage) {
+                                    busy.manifest(this.xtr(btCfg.busyMessage));
+                                } else {
+                                    busy.manifest(this.tr('Preparing Download ...'));
+                                }
+                                setTimeout(() => { busy.vanish(); }, 3 * 1000); // hide the activity indicator after 3 seconds anyway
                             }
-                            setTimeout(() => { busy.vanish(); }, 3 * 1000); // hide the activity indicator after 3 seconds anyway
                             callbackery.data.Server.getInstance().callAsyncSmart(function (cookie) {
                                 let url = 'download'
                                     + '?name=' + cfg.name
@@ -422,7 +428,9 @@ qx.Class.define("callbackery.ui.plugin.Action", {
                                     height: 100
                                 });
                                 iframe.addListener('load', function (e) {
-                                    busy.vanish();
+                                    if (showBusy) {
+                                        busy.vanish();
+                                    }
                                     var response = {
                                         exception: {
                                             message: String(that.tr("No Data")),