Preliminary SVG-edit Support

WYSIWYG SVG editing.

Still no support for mixed
SVG/MathML content, yet.

public/svg-edit/opera-widget/handlers.js

@@ -0,0 +1,62 @@
+// Note: This JavaScript file must be included as the last script on the main HTML editor page to override the open/save handlers
+$(function() {
+	if(window.opera && window.opera.io && window.opera.io.filesystem) {
+		svgCanvas.setCustomHandlers({
+			'open':function() {
+				try {
+					window.opera.io.filesystem.browseForFile(
+						new Date().getTime(), /* mountpoint name */
+						"", /* default location */
+						function(file) {
+							try {
+								if (file) {
+									fstream = file.open(file, "r");
+									var output = "";
+									while (!fstream.eof) {
+										output += fstream.readLine();
+									}
+									
+									svgCanvas.setSvgString(output); /* 'this' is bound to the filestream object here */
+								}
+							}
+							catch(e) {
+								console.log("Reading file failed.");
+							}
+						},
+						false, /* not persistent */
+						false, /* no multiple selections */
+						"*.svg" /* file extension filter */
+					);
+				}
+				catch(e) {
+					console.log("Open file failed.");
+				}
+
+			},
+			'save':function(window, svg) {
+				try {
+					window.opera.io.filesystem.browseForSave(
+						new Date().getTime(), /* mountpoint name */
+						"", /* default location */
+						function(file) {
+							try {
+								if (file) {
+									var fstream = file.open(file, "w");
+									fstream.write(svg, "UTF-8");
+									fstream.close();
+								}
+							}
+							catch(e) {
+								console.log("Write to file failed.");
+							}
+						}, 
+						false /* not persistent */
+					);
+				}
+				catch(e) {
+					console.log("Save file failed.");
+				}
+			}
+		});
+	}
+});