Merge pull request matplotlib#3974 from blink1073/nbagg-save

Add Save Tool to NbAgg Figure

Author: pelson

lib/matplotlib/backends/backend_nbagg.py

@@ -92,6 +92,7 @@ def connection_info():
     'forward': 'fa fa-arrow-right icon-arrow-right',
     'zoom_to_rect': 'fa fa-square-o icon-check-empty',
     'move': 'fa fa-arrows icon-move',
+    'download': 'fa fa-icon-save icon-save',
     None: None
 }
 
@@ -102,7 +103,8 @@ class NavigationIPy(NavigationToolbar2WebAgg):
     toolitems = [(text, tooltip_text,
                   _FONT_AWESOME_CLASSES[image_file], name_of_method)
                  for text, tooltip_text, image_file, name_of_method
-                 in NavigationToolbar2.toolitems
+                 in (NavigationToolbar2.toolitems +
+                     (('Download', 'Download plot', 'download', 'download'),))
                  if image_file in _FONT_AWESOME_CLASSES]
 
 

lib/matplotlib/backends/backend_webagg_core.py

@@ -329,7 +329,7 @@ def release_zoom(self, event):
 
     def save_figure(self, *args):
         """Save the current figure"""
-        warnings.warn('"Save figure" not implemented in Web Backend')
+        self.canvas.send_event('save')
 
 
 class FigureManagerWebAgg(backend_bases.FigureManagerBase):

lib/matplotlib/backends/web_backend/mpl.js

@@ -283,6 +283,14 @@ mpl.figure.prototype.send_draw_message = function() {
     }
 }
 
+
+mpl.figure.prototype.handle_save = function(fig, msg) {
+    var format_dropdown = fig.format_dropdown;
+    var format = format_dropdown.options[format_dropdown.selectedIndex].value;
+    fig.ondownload(fig, format);
+}
+
+
 mpl.figure.prototype.handle_resize = function(fig, msg) {
     var size = msg['size'];
     if (size[0] != fig.canvas.width || size[1] != fig.canvas.height) {
@@ -472,9 +480,7 @@ mpl.figure.prototype.key_event = function(event, name) {
 
 mpl.figure.prototype.toolbar_button_onclick = function(name) {
     if (name == 'download') {
-        var format_dropdown = this.format_dropdown;
-        var format = format_dropdown.options[format_dropdown.selectedIndex].value;
-        this.ondownload(this, format);
+        this.handle_save(this, null);
     } else {
         this.send_message("toolbar_button", {name: name});
     }

lib/matplotlib/backends/web_backend/nbagg_mpl.js

@@ -30,8 +30,12 @@ mpl.mpl_figure_comm = function(comm, msg) {
     var element = $("#" + id);
     var ws_proxy = comm_websocket_adapter(comm)
 
+    function ondownload(figure, format) {
+        window.open(figure.imageObj.src);
+    }
+
     var fig = new mpl.figure(id, ws_proxy,
-                           function() { },
+                           ondownload,
                            element.get(0));
 
     // Call onopen now - mpl needs it, as it is assuming we've passed it a real
@@ -142,6 +146,11 @@ mpl.figure.prototype._canvas_extra_style = function(el){
 }
 
 
+mpl.figure.prototype.handle_save = function(fig, msg) {
+    fig.ondownload(fig, null);
+}
+
+
 mpl.find_output_cell = function(html_output) {
     // Return the cell and output element which can be found *uniquely* in the notebook.
     // Note - this is a bit hacky, but it is done because the "notebook_saving.Notebook"