Bug 1210265 - Add a pref toggle for copying/pasting only plain text on B2G. r=timdream

Add a new preference, clibboard.plainTextOnly.
1. On:  we only support kUnicodeMIME in SetData/GetData.
2. Off: we can support different MIME types in SetData/GetData

BTW, "copy image" is dependent on non-text/rich text support, so this
menu item is also disabled after we turn the pref off.

dom/base/test/test_bug116083.html

@@ -63,8 +63,7 @@ function hasExpectedFlavors() {
                                    cb.kGlobalClipboard);
 }
 
-SimpleTest.waitForExplicitFinish();
-SimpleTest.waitForFocus(function nextTest() {
+function nextTest() {
   var div = document.querySelector("#content>div");
   if (!div) {
     SimpleTest.finish();
@@ -85,6 +84,11 @@ SimpleTest.waitForFocus(function nextTest() {
     ok(false, "failed to copy the expected content to the clipboard");
     SimpleTest.finish();
   });
+}
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+  SpecialPowers.pushPrefEnv({"set": [["clipboard.plainTextOnly", false]]}, nextTest);
 });
 
 </script>

dom/base/test/test_copyimage.html

@@ -77,7 +77,9 @@ function testCopyImage () {
 }
 
 SimpleTest.waitForExplicitFinish();
-addLoadEvent(testCopyImage);
+addLoadEvent(function() {
+  SpecialPowers.pushPrefEnv({"set": [["clipboard.plainTextOnly", false]]}, testCopyImage);
+});
 
 </script>
 </pre>

dom/browser-element/BrowserElementChildPreload.js

@@ -869,6 +869,7 @@ BrowserElementChild.prototype = {
     var elem = e.target;
     var menuData = {systemTargets: [], contextmenu: null};
     var ctxMenuId = null;
+    var clipboardPlainTextOnly = Services.prefs.getBoolPref('clipboard.plainTextOnly');
     var copyableElements = {
       image: false,
       link: false,
@@ -896,7 +897,7 @@ BrowserElementChild.prototype = {
 
       // Enable copy image/link option
       if (elem.nodeName == 'IMG') {
-        copyableElements.image = true;
+        copyableElements.image = !clipboardPlainTextOnly;
       } else if (elem.nodeName == 'A') {
         copyableElements.link = true;
       }

dom/browser-element/mochitest/browserElementTestHelpers.js

@@ -57,6 +57,10 @@ const browserElementTestHelpers = {
     );
   },
 
+  setClipboardPlainTextOnlyPref: function(value) {
+    this._setPref('clipboard.plainTextOnly', value);
+  },
+
   setEnabledPref: function(value) {
     this._setPref('dom.mozBrowserFramesEnabled', value);
   },

dom/browser-element/mochitest/browserElement_ContextmenuEvents.js

@@ -2,6 +2,7 @@
 
 SimpleTest.waitForExplicitFinish();
 browserElementTestHelpers.setEnabledPref(true);
+browserElementTestHelpers.setClipboardPlainTextOnlyPref(false);
 browserElementTestHelpers.addPermission();
 
 var audioUrl = 'http://mochi.test:8888/tests/dom/browser-element/mochitest/audio.ogg';

modules/libpref/init/all.js

@@ -2006,6 +2006,9 @@ pref("middlemouse.scrollbarPosition", false);
 // Clipboard behavior
 pref("clipboard.autocopy", false);
 
+// Clipboard only supports text/plain
+pref("clipboard.plainTextOnly", false);
+
 // mouse wheel scroll transaction period of time (in milliseconds)
 pref("mousewheel.transaction.timeout", 1500);
 // mouse wheel scroll transaction is held even if the mouse cursor is moved.

widget/gonk/nsClipboard.cpp

@@ -10,6 +10,7 @@
 #include "imgIContainer.h"
 #include "imgTools.h"
 #include "mozilla/dom/ContentChild.h"
+#include "mozilla/Preferences.h"
 #include "nsClipboardProxy.h"
 #include "nsISupportsPrimitives.h"
 #include "nsComponentManagerUtils.h"
@@ -48,9 +49,29 @@ nsClipboard::SetData(nsITransferable *aTransferable,
     return clipboardProxy->SetData(aTransferable, anOwner, aWhichClipboard);
   }
 
-  // Clear out the clipboard in order to set the new data
+  // Clear out the clipboard in order to set the new data.
   EmptyClipboard(aWhichClipboard);
 
+  // Use a pref to toggle rich text/non-text support.
+  if (Preferences::GetBool("clipboard.plainTextOnly")) {
+    nsCOMPtr<nsISupports> clip;
+    uint32_t len;
+    nsresult rv = aTransferable->GetTransferData(kUnicodeMime,
+                                                 getter_AddRefs(clip),
+                                                 &len);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    nsCOMPtr<nsISupportsString> wideString = do_QueryInterface(clip);
+    if (!wideString) {
+      return NS_ERROR_NOT_IMPLEMENTED;
+    }
+    nsAutoString utf16string;
+    wideString->GetData(utf16string);
+    mClipboard->SetText(utf16string);
+    return NS_OK;
+  }
+
   // Get the types of supported flavors.
   nsCOMPtr<nsISupportsArray> flavorList;
   nsresult rv = aTransferable->FlavorsTransferableCanExport(getter_AddRefs(flavorList));
@@ -161,6 +182,24 @@ nsClipboard::GetData(nsITransferable *aTransferable,
     return clipboardProxy->GetData(aTransferable, aWhichClipboard);
   }
 
+  // Use a pref to toggle rich text/non-text support.
+  if (Preferences::GetBool("clipboard.plainTextOnly")) {
+    nsresult rv;
+    nsCOMPtr<nsISupportsString> dataWrapper =
+      do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv);
+    rv = dataWrapper->SetData(mClipboard->GetText());
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    nsCOMPtr<nsISupports> genericDataWrapper = do_QueryInterface(dataWrapper);
+    uint32_t len = mClipboard->GetText().Length() * sizeof(char16_t);
+    rv = aTransferable->SetTransferData(kUnicodeMime, genericDataWrapper, len);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    return NS_OK;
+  }
+
   // Get flavor list that includes all acceptable flavors (including
   // ones obtained through conversion).
   // Note: We don't need to call nsITransferable::AddDataFlavor here