X-Git-Url: https://git-public.kairo.at/?p=mandelbrot.git;a=blobdiff_plain;f=xulapp%2Fchrome%2Fmandelbrot%2Fcontent%2Fmandelbrot.js;h=e3c36ae00e8278d53e33b4645f6f7c1b45ce176c;hp=aab0f02b884861fc98ea39afac4be8a042c97c73;hb=740b86d148283d0cb4a66df542d081ab89278279;hpb=2cb9a6b558e687bc39584fb763a9455b8db00204

diff --git a/xulapp/chrome/mandelbrot/content/mandelbrot.js b/xulapp/chrome/mandelbrot/content/mandelbrot.js
index aab0f02..e3c36ae 100644
--- a/xulapp/chrome/mandelbrot/content/mandelbrot.js
+++ b/xulapp/chrome/mandelbrot/content/mandelbrot.js
@@ -283,8 +283,23 @@ function drawPoint(context, img_x, img_y, C, iterMax, algorithm) {
 /***** pure UI functions *****/
 
 function saveImage() {
-  // XXX: should call filepicker!
-  saveCanvas(document.getElementById("mbrotImage"), "/home/robert/temp/canvas-save.png")
+  const bundle = document.getElementById("mbrotBundle");
+  const nsIFilePicker = Components.interfaces.nsIFilePicker;
+  var fp = null;
+  try {
+    fp = Components.classes["@mozilla.org/filepicker;1"]
+                   .createInstance(nsIFilePicker);
+  } catch (e) {}
+  if (!fp) return;
+  var promptString = bundle.getString("savePrompt");
+  fp.init(window, promptString, nsIFilePicker.modeSave);
+  fp.appendFilter(bundle.getString("pngFilterName"), "*.png");
+  fp.defaultString = "mandelbrot.png";
+
+  var fpResult = fp.show();
+  if (fpResult != nsIFilePicker.returnCancel) {
+    saveCanvas(document.getElementById("mbrotImage"), fp.file);
+  }
 }
 
 function updateIterMenu() {
@@ -391,18 +406,16 @@ function setAlgorithm(algoID) {
 
 /***** helper functions from external sources *****/
 
-// function below is from from http://developer.mozilla.org/en/docs/Code_snippets:Canvas
-function saveCanvas(canvas, destFile) {
-  // convert string filepath to an nsIFile
-  var file = Components.classes["@mozilla.org/file/local;1"]
-                       .createInstance(Components.interfaces.nsILocalFile);
-  file.initWithPath(destFile);
-
+// function below is based on http://developer.mozilla.org/en/docs/Code_snippets:Canvas
+// custom modifications:
+//   - use "a"-prefix on function arguments
+//   - take an nsILocalFile as aDestFile argument
+//   - always do silent download
+function saveCanvas(aCanvas, aDestFile) {
   // create a data url from the canvas and then create URIs of the source and targets  
   var io = Components.classes["@mozilla.org/network/io-service;1"]
                      .getService(Components.interfaces.nsIIOService);
-  var source = io.newURI(canvas.toDataURL("image/png", ""), "UTF8", null);
-  var target = io.newFileURI(file);
+  var source = io.newURI(aCanvas.toDataURL("image/png", ""), "UTF8", null);
 
   // prepare to save the canvas data
   var persist = Components.classes["@mozilla.org/embedding/browser/nsWebBrowserPersist;1"]
@@ -411,14 +424,8 @@ function saveCanvas(canvas, destFile) {
   persist.persistFlags = Components.interfaces.nsIWebBrowserPersist.PERSIST_FLAGS_REPLACE_EXISTING_FILES;
   persist.persistFlags |= Components.interfaces.nsIWebBrowserPersist.PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION;
 
-  // displays a download dialog (remove these 3 lines for silent download)
-  var xfer = Components.classes["@mozilla.org/transfer;1"]
-                       .createInstance(Components.interfaces.nsITransfer);
-  xfer.init(source, target, "", null, null, null, persist);
-  persist.progressListener = xfer;
-
   // save the canvas data to the file
-  persist.saveURI(source, null, null, null, null, file);
+  persist.saveURI(source, null, null, null, null, aDestFile);
 }
 
 // function below is from http://developer.mozilla.org/en/docs/How_to_Quit_a_XUL_Application