Merge pull request #1286 from takluyver/system-clipboard

Copy and paste cells with system clipboard

notebook/static/notebook/js/clipboard.js

@@ -0,0 +1,132 @@
+// Copyright (c) Jupyter Development Team.
+// Distributed under the terms of the Modified BSD License.
+
+define([
+    'base/js/namespace',
+    'base/js/utils',
+    'base/js/dialog'
+], function(Jupyter, utils, dialog) {
+
+var jcbprefix = '<pre class="jupyter-nb-cells-json">';
+var jcbsuffix = '</pre>';
+
+function store_json(cells, clipboard) {
+  // Firefox ignores application/json mime type, so put it in HTML as well.
+  // We also copy a text version so you can paste cell sources into a text editor
+  var j = JSON.stringify(cells);
+  var t = cells.map(function(c) {return c.source;}).join('\n\n');
+  clipboard.setData('text/plain', t);
+  clipboard.setData('text/html', jcbprefix + j + jcbsuffix);
+  clipboard.setData('application/json', j);
+}
+
+function load_json(clipboard) {
+  var s = clipboard.getData('text/html');
+  // System/browsers may add some more stuff before/after our content, so
+  // find where our prefix and suffix are.
+  var pix = s.indexOf(jcbprefix);
+  var six = s.lastIndexOf(jcbsuffix);
+  if (pix === -1 || six === -1) {
+    return null;
+  }
+  return JSON.parse(s.slice(pix + jcbprefix.length, six));
+}
+
+function copy(event) {
+  if (Jupyter.notebook.mode !== 'command') {
+    return;
+  }
+  var selecn = Jupyter.notebook.get_selected_cells().map(
+    function(c) { return c.toJSON();});
+  store_json(selecn, event.clipboardData);
+  event.preventDefault();
+}
+
+function paste(event) {
+  if (Jupyter.notebook.mode !== 'command') {
+    return;
+  }
+  console.log('Clipboard types: ' + event.clipboardData.types);
+  cells = load_json(event.clipboardData);
+  // console.log(cells);
+  // Does this JSON look like cells?
+  if (Array.isArray(cells) && (cells.length > 0) &&
+      cells[0].cell_type && cells[0].source) {
+    var first_inserted = null;
+    for (var i=0; i < cells.length; i++) {
+        var cell_data = cells[i];
+        var new_cell = Jupyter.notebook.insert_cell_above(cell_data.cell_type);
+        new_cell.fromJSON(cell_data);
+        if (first_inserted === null) {
+            first_inserted = new_cell;
+        }
+    }
+    first_inserted.focus_cell();
+  }
+  event.preventDefault();
+}
+
+function needs_text_box_for_paste_event() {
+  // I know this is bad, but I don't know a better way to check this
+  return navigator.userAgent.indexOf('Firefox') !== -1;
+}
+
+function setup_paste_dialog() {
+  // Firefox only fires a paste event if the cursor is in a text input. So, on
+  // Ctrl-V, bring up a dialog with an invisible text box and catch the
+  // second Ctrl-V
+  var action = {
+      icon: 'fa-clipboard', // a font-awesome class used on buttons, etc
+      help    : 'Dialog for paste from system clipboard',
+      help_index : 'zz',
+      handler : function () {
+        var entry_box = $('<input type="text"/>');
+        entry_box.css('opacity', 0);
+        function paste_close_dlg(e) {
+          paste(e);
+          // There must be a better way to do this, but it's not any of:
+          // .hide(), .remove() or .dialog('close')
+          paste_dlg.find('.close').click();
+          document.removeEventListener('paste', paste_close_dlg);
+        }
+        document.addEventListener('paste', paste_close_dlg);
+        var cmdtrl = 'Ctrl';
+        if (utils.platform === 'MacOS') {
+            cmdtrl = 'Cmd';
+        }
+        var dialog_body = $("<div/>").append("<p>Press "+cmdtrl+"-V again to paste")
+            .append("<br/>")
+            .append("<p><b>Why is this needed?</b> We can't get paste events in this browser without a text box. "+
+                     "There's an invisible text box focused in this dialog.")
+            .append($("<form/>").append(entry_box));
+
+        var paste_dlg = dialog.modal({
+            notebook: Jupyter.notebook,
+            keyboard_manager: Jupyter.keyboard_manager,
+            title : cmdtrl+"-V to paste",
+            body : dialog_body,
+            open: function() {
+                entry_box.focus();
+            },
+            buttons : {
+                "Cancel" : {
+                    // click : function() { reject("Dialog cancelled"); },
+                }
+            }
+        });
+      }
+  };
+  var full_action_name = Jupyter.actions.register(action, 'paste-dialog', 'system-clipboard');
+  Jupyter.keyboard_manager.command_shortcuts.add_shortcut('Cmdtrl-V', full_action_name);
+}
+
+// Set clipboard event listeners on the document.
+return {setup_clipboard_events: function() {
+  document.addEventListener('copy', copy);
+  if (needs_text_box_for_paste_event()) {
+    setup_paste_dialog();
+  } else {
+    document.addEventListener('paste', paste);
+  }
+}};
+});

notebook/static/notebook/js/main.js

@@ -23,7 +23,8 @@ require([
     'notebook/js/kernelselector',
     'codemirror/lib/codemirror',
     'notebook/js/about',
-    'notebook/js/searchandreplace'
+    'notebook/js/searchandreplace',
+    'notebook/js/clipboard'
 ], function(
     IPython,
     $,
@@ -44,7 +45,8 @@ require([
     kernelselector,
     CodeMirror,
     about,
-    searchandreplace
+    searchandreplace,
+    clipboard
     ) {
     "use strict";
 
@@ -178,6 +180,8 @@ require([
       configurable: false
     });
 
+    clipboard.setup_clipboard_events();
+    
     // Now actually load nbextensionsload_extensions_from_config
     Promise.all([
         utils.load_extensions_from_config(config_section),