1 files changed, 125 insertions, 0 deletions
diff --git a/dom/browser-element/BrowserElementCopyPaste.js b/dom/browser-element/BrowserElementCopyPaste.js
new file mode 100644
index 000000000..7aa7c5148
--- /dev/null
+++ b/dom/browser-element/BrowserElementCopyPaste.js
@@ -0,0 +1,125 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- /
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+function debug(msg) {
+  // dump("BrowserElementCopyPaste - " + msg + "\n");
+}
+
+debug("loaded");
+
+var { classes: Cc, interfaces: Ci, results: Cr, utils: Cu }  = Components;
+
+var CopyPasteAssistent = {
+  COMMAND_MAP: {
+    'cut': 'cmd_cut',
+    'copy': 'cmd_copyAndCollapseToEnd',
+    'paste': 'cmd_paste',
+    'selectall': 'cmd_selectAll'
+  },
+
+  init: function() {
+    addEventListener("mozcaretstatechanged", this,
+                     /* useCapture = */ true, /* wantsUntrusted = */ false);
+    addMessageListener("browser-element-api:call", this);
+  },
+
+  destroy: function() {
+    removeEventListener("mozcaretstatechanged", this,
+                        /* useCapture = */ true, /* wantsUntrusted = */ false);
+    removeMessageListener("browser-element-api:call", this);
+  },
+
+  handleEvent: function(event) {
+    switch (event.type) {
+      case "mozcaretstatechanged":
+        this._caretStateChangedHandler(event);
+        break;
+    }
+  },
+
+  receiveMessage: function(message) {
+    switch (message.name) {
+      case "browser-element-api:call":
+        this._browserAPIHandler(message);
+        break;
+    }
+  },
+
+  _browserAPIHandler: function(e) {
+    switch (e.data.msg_name) {
+      case 'copypaste-do-command':
+        if (this._isCommandEnabled(e.data.command)) {
+          docShell.doCommand(this.COMMAND_MAP[e.data.command]);
+        }
+        break;
+    }
+  },
+
+  _isCommandEnabled: function(cmd) {
+    let command = this.COMMAND_MAP[cmd];
+    if (!command) {
+      return false;
+    }
+
+    return docShell.isCommandEnabled(command);
+  },
+
+  _caretStateChangedHandler: function(e) {
+    e.stopPropagation();
+
+    let boundingClientRect = e.boundingClientRect;
+    let canPaste = this._isCommandEnabled("paste");
+    let zoomFactor = content.innerWidth == 0 ? 1 : content.screen.width / content.innerWidth;
+
+    let detail = {
+      rect: {
+        width: boundingClientRect ? boundingClientRect.width : 0,
+        height: boundingClientRect ? boundingClientRect.height : 0,
+        top: boundingClientRect ? boundingClientRect.top : 0,
+        bottom: boundingClientRect ? boundingClientRect.bottom : 0,
+        left: boundingClientRect ? boundingClientRect.left : 0,
+        right: boundingClientRect ? boundingClientRect.right : 0,
+      },
+      commands: {
+        canSelectAll: this._isCommandEnabled("selectall"),
+        canCut: this._isCommandEnabled("cut"),
+        canCopy: this._isCommandEnabled("copy"),
+        canPaste: this._isCommandEnabled("paste"),
+      },
+      zoomFactor: zoomFactor,
+      reason: e.reason,
+      collapsed: e.collapsed,
+      caretVisible: e.caretVisible,
+      selectionVisible: e.selectionVisible,
+      selectionEditable: e.selectionEditable,
+      selectedTextContent: e.selectedTextContent
+    };
+
+    // Get correct geometry information if we have nested iframe.
+    let currentWindow = e.target.defaultView;
+    while (currentWindow.realFrameElement) {
+      let currentRect = currentWindow.realFrameElement.getBoundingClientRect();
+      detail.rect.top += currentRect.top;
+      detail.rect.bottom += currentRect.top;
+      detail.rect.left += currentRect.left;
+      detail.rect.right += currentRect.left;
+      currentWindow = currentWindow.realFrameElement.ownerDocument.defaultView;
+
+      let targetDocShell = currentWindow
+          .QueryInterface(Ci.nsIInterfaceRequestor)
+          .getInterface(Ci.nsIWebNavigation);
+      if(targetDocShell.isMozBrowserOrApp) {
+        break;
+      }
+    }
+
+    sendAsyncMsg('caretstatechanged', detail);
+  },
+};
+
+CopyPasteAssistent.init();