From ed53a8d58060c45bacbb446026ab9e499349be36 Mon Sep 17 00:00:00 2001
From: Jeremy Ruston <jeremy@jermolene.com>
Date: Wed, 18 Dec 2024 19:24:55 +0000
Subject: [PATCH] Add support for oncompletion handler

---
 plugins/tiddlywiki/dom-to-image/docs.tid   |  2 ++
 plugins/tiddlywiki/dom-to-image/startup.js | 16 +++++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/plugins/tiddlywiki/dom-to-image/docs.tid b/plugins/tiddlywiki/dom-to-image/docs.tid
index 095406477..5183e9758 100644
--- a/plugins/tiddlywiki/dom-to-image/docs.tid
+++ b/plugins/tiddlywiki/dom-to-image/docs.tid
@@ -18,6 +18,8 @@ The following parameters are supported:
 |''height'' |Optional height of the image in pixels |
 |''save-file'' |Optional filename to save the image to |
 |''save-title'' |Optional title of tiddler to save the image to |
+|''oncompletion'' |Optional action string to be invoked when the save operation has completed |
+|''var-*'' |Variables to be passed to the completion handler (without the "var-" prefix) |
 
 !! Examples
 
diff --git a/plugins/tiddlywiki/dom-to-image/startup.js b/plugins/tiddlywiki/dom-to-image/startup.js
index adc2ca65d..4584752b8 100644
--- a/plugins/tiddlywiki/dom-to-image/startup.js
+++ b/plugins/tiddlywiki/dom-to-image/startup.js
@@ -19,10 +19,22 @@ exports.before = ["render"];
 exports.synchronous = true;
 
 exports.startup = function() {
+	var getPropertiesWithPrefix = function(properties,prefix) {
+		var result = Object.create(null);
+		$tw.utils.each(properties,function(value,name) {
+			if(name.indexOf(prefix) === 0) {
+				result[name.substring(prefix.length)] = properties[name];
+			}
+		});
+		return result;
+	};
 	$tw.rootWidget.addEventListener("tm-save-dom-to-image",function(event) {
+		var self=this; /* ELS */
 		var params = event.paramObject || {},
 			domToImage = require("$:/plugins/tiddlywiki/dom-to-image/dom-to-image-more.js"),
-			domNode = document.querySelector(params.selector || "body.tc-body");
+			domNode = document.querySelector(params.selector || "body.tc-body"),
+			oncompletion = params.oncompletion,
+			variables = getPropertiesWithPrefix(params,"var-");
 		if(domNode) {
 			var method = "toPng";
 			switch(params.format) {
@@ -67,6 +79,7 @@ exports.startup = function() {
 						}));	
 					}
 				}
+				self.wiki.invokeActionString(oncompletion,self,variables,{parentWidget: $tw.rootWidget});
 			})
 			.catch(function(error) {
 				console.error('oops, something went wrong!', error);
@@ -76,3 +89,4 @@ exports.startup = function() {
 };
 
 })();
+	
\ No newline at end of file