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Diffstat (limited to '')
| -rw-r--r-- | editor/libeditor/TextEditorDataTransfer.cpp | 751 |
1 files changed, 751 insertions, 0 deletions
diff --git a/editor/libeditor/TextEditorDataTransfer.cpp b/editor/libeditor/TextEditorDataTransfer.cpp new file mode 100644 index 0000000000..7c07a41a3c --- /dev/null +++ b/editor/libeditor/TextEditorDataTransfer.cpp @@ -0,0 +1,751 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* 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/. */ + +#include "mozilla/TextEditor.h" + +#include "mozilla/ArrayUtils.h" +#include "mozilla/HTMLEditor.h" +#include "mozilla/MouseEvents.h" +#include "mozilla/SelectionState.h" +#include "mozilla/TextControlElement.h" +#include "mozilla/dom/DataTransfer.h" +#include "mozilla/dom/DocumentInlines.h" +#include "mozilla/dom/DragEvent.h" +#include "mozilla/dom/Selection.h" +#include "mozilla/dom/StaticRange.h" +#include "nsAString.h" +#include "nsCOMPtr.h" +#include "nsComponentManagerUtils.h" +#include "nsContentUtils.h" +#include "nsDebug.h" +#include "nsError.h" +#include "nsFocusManager.h" +#include "nsIClipboard.h" +#include "nsIContent.h" +#include "mozilla/dom/BrowsingContext.h" +#include "mozilla/dom/Document.h" +#include "nsIDragService.h" +#include "nsIDragSession.h" +#include "nsIDocShell.h" +#include "nsIDocShellTreeItem.h" +#include "nsIPrincipal.h" +#include "nsIFormControl.h" +#include "nsISupportsPrimitives.h" +#include "nsITransferable.h" +#include "nsIVariant.h" +#include "nsLiteralString.h" +#include "nsRange.h" +#include "nsServiceManagerUtils.h" +#include "nsString.h" +#include "nsXPCOM.h" +#include "nscore.h" + +class nsILoadContext; +class nsISupports; + +namespace mozilla { + +using namespace dom; + +nsresult TextEditor::PrepareTransferable(nsITransferable** aOutTransferable) { + MOZ_ASSERT(aOutTransferable); + MOZ_ASSERT(!*aOutTransferable); + + // Create generic Transferable for getting the data + nsresult rv; + nsCOMPtr<nsITransferable> transferable = + do_CreateInstance("@mozilla.org/widget/transferable;1", &rv); + if (NS_FAILED(rv)) { + NS_WARNING("do_CreateInstance() failed to create nsITransferable instance"); + return rv; + } + + if (!transferable) { + NS_WARNING("do_CreateInstance() returned nullptr, but ignored"); + return NS_OK; + } + + RefPtr<Document> document = GetDocument(); + nsILoadContext* loadContext = document ? document->GetLoadContext() : nullptr; + DebugOnly<nsresult> rvIgnored = transferable->Init(loadContext); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored), + "nsITransferable::Init() failed, but ignored"); + + rvIgnored = transferable->AddDataFlavor(kUnicodeMime); + NS_WARNING_ASSERTION( + NS_SUCCEEDED(rvIgnored), + "nsITransferable::AddDataFlavor(kUnicodeMime) failed, but ignored"); + rvIgnored = transferable->AddDataFlavor(kMozTextInternal); + NS_WARNING_ASSERTION( + NS_SUCCEEDED(rvIgnored), + "nsITransferable::AddDataFlavor(kMozTextInternal) failed, but ignored"); + transferable.forget(aOutTransferable); + return NS_OK; +} + +nsresult TextEditor::PrepareToInsertContent( + const EditorDOMPoint& aPointToInsert, bool aDoDeleteSelection) { + // TODO: Move this method to `EditorBase`. + MOZ_ASSERT(IsEditActionDataAvailable()); + + MOZ_ASSERT(aPointToInsert.IsSet()); + + EditorDOMPoint pointToInsert(aPointToInsert); + if (aDoDeleteSelection) { + AutoTrackDOMPoint tracker(RangeUpdaterRef(), &pointToInsert); + nsresult rv = DeleteSelectionAsSubAction( + nsIEditor::eNone, + IsTextEditor() ? nsIEditor::eNoStrip : nsIEditor::eStrip); + if (NS_FAILED(rv)) { + NS_WARNING("EditorBase::DeleteSelectionAsSubAction(eNone) failed"); + return rv; + } + } + + IgnoredErrorResult error; + MOZ_KnownLive(SelectionRefPtr())->CollapseInLimiter(pointToInsert, error); + if (NS_WARN_IF(Destroyed())) { + return NS_ERROR_EDITOR_DESTROYED; + } + NS_WARNING_ASSERTION(!error.Failed(), + "Selection::CollapseInLimiter() failed"); + return error.StealNSResult(); +} + +nsresult TextEditor::InsertTextAt(const nsAString& aStringToInsert, + const EditorDOMPoint& aPointToInsert, + bool aDoDeleteSelection) { + MOZ_ASSERT(IsEditActionDataAvailable()); + + MOZ_ASSERT(aPointToInsert.IsSet()); + + nsresult rv = PrepareToInsertContent(aPointToInsert, aDoDeleteSelection); + if (NS_FAILED(rv)) { + NS_WARNING("TextEditor::PrepareToInsertContent() failed"); + return rv; + } + + rv = InsertTextAsSubAction(aStringToInsert); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), + "EditorBase::InsertTextAsSubAction() failed"); + return rv; +} + +nsresult TextEditor::InsertTextFromTransferable( + nsITransferable* aTransferable) { + MOZ_ASSERT(IsEditActionDataAvailable()); + MOZ_ASSERT(!AsHTMLEditor()); + + nsAutoCString bestFlavor; + nsCOMPtr<nsISupports> genericDataObj; + nsresult rv = aTransferable->GetAnyTransferData( + bestFlavor, getter_AddRefs(genericDataObj)); + NS_WARNING_ASSERTION( + NS_SUCCEEDED(rv), + "nsITransferable::GetAnyDataTransferData() failed, but ignored"); + if (NS_SUCCEEDED(rv) && (bestFlavor.EqualsLiteral(kUnicodeMime) || + bestFlavor.EqualsLiteral(kMozTextInternal))) { + AutoTransactionsConserveSelection dontChangeMySelection(*this); + + nsAutoString stuffToPaste; + if (nsCOMPtr<nsISupportsString> text = do_QueryInterface(genericDataObj)) { + text->GetData(stuffToPaste); + } + MOZ_ASSERT(GetEditAction() == EditAction::ePaste); + // Use native line breaks for compatibility with Chrome. + // XXX Although, somebody has already converted native line breaks to + // XP line breaks. + UpdateEditActionData(stuffToPaste); + + nsresult rv = MaybeDispatchBeforeInputEvent(); + if (NS_FAILED(rv)) { + NS_WARNING_ASSERTION( + rv == NS_ERROR_EDITOR_ACTION_CANCELED, + "EditorBase::MaybeDispatchBeforeInputEvent() failed"); + return rv; + } + + if (!stuffToPaste.IsEmpty()) { + // Sanitize possible carriage returns in the string to be inserted + nsContentUtils::PlatformToDOMLineBreaks(stuffToPaste); + + AutoPlaceholderBatch treatAsOneTransaction(*this, + ScrollSelectionIntoView::Yes); + nsresult rv = InsertTextAsSubAction(stuffToPaste); + if (NS_FAILED(rv)) { + NS_WARNING("EditorBase::InsertTextAsSubAction() failed"); + return rv; + } + } + } + + // Try to scroll the selection into view if the paste/drop succeeded + rv = ScrollSelectionFocusIntoView(); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), + "EditorBase::ScrollSelectionFocusIntoView() failed"); + return rv; +} + +nsresult TextEditor::OnDrop(DragEvent* aDropEvent) { + if (NS_WARN_IF(!aDropEvent)) { + return NS_ERROR_INVALID_ARG; + } + + DebugOnly<nsresult> rvIgnored = CommitComposition(); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored), + "EditorBase::CommitComposition() failed, but ignored"); + + AutoEditActionDataSetter editActionData(*this, EditAction::eDrop); + // We need to initialize data or dataTransfer later. Therefore, we cannot + // dispatch "beforeinput" event until then. + if (NS_WARN_IF(!editActionData.CanHandle())) { + return NS_ERROR_NOT_INITIALIZED; + } + + RefPtr<DataTransfer> dataTransfer = aDropEvent->GetDataTransfer(); + if (NS_WARN_IF(!dataTransfer)) { + return NS_ERROR_FAILURE; + } + + nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession(); + if (NS_WARN_IF(!dragSession)) { + return NS_ERROR_FAILURE; + } + + nsCOMPtr<nsINode> sourceNode = dataTransfer->GetMozSourceNode(); + + RefPtr<Document> srcdoc; + if (sourceNode) { + srcdoc = sourceNode->OwnerDoc(); + } + + if (nsContentUtils::CheckForSubFrameDrop( + dragSession, aDropEvent->WidgetEventPtr()->AsDragEvent())) { + // Don't allow drags from subframe documents with different origins than + // the drop destination. + if (srcdoc && !IsSafeToInsertData(srcdoc)) { + return NS_OK; + } + } + + // Current doc is destination + RefPtr<Document> document = GetDocument(); + if (NS_WARN_IF(!document)) { + return NS_ERROR_NOT_INITIALIZED; + } + + const uint32_t numItems = dataTransfer->MozItemCount(); + if (NS_WARN_IF(!numItems)) { + return NS_ERROR_FAILURE; // Nothing to drop? + } + + // We have to figure out whether to delete and relocate caret only once + // Parent and offset are under the mouse cursor. + int32_t dropOffset = -1; + nsCOMPtr<nsIContent> dropParentContent = + aDropEvent->GetRangeParentContentAndOffset(&dropOffset); + EditorDOMPoint droppedAt(dropParentContent, dropOffset); + if (NS_WARN_IF(!droppedAt.IsSet()) || + NS_WARN_IF(!droppedAt.GetContainerAsContent())) { + return NS_ERROR_FAILURE; + } + + // Check if dropping into a selected range. If so and the source comes from + // same document, jump through some hoops to determine if mouse is over + // selection (bail) and whether user wants to copy selection or delete it. + if (sourceNode && sourceNode->IsEditable() && srcdoc == document) { + bool isPointInSelection = EditorUtils::IsPointInSelection( + *SelectionRefPtr(), *droppedAt.GetContainer(), droppedAt.Offset()); + if (isPointInSelection) { + // If source document and destination document is same and dropping + // into one of selected ranges, we don't need to do nothing. + // XXX If the source comes from outside of this editor, this check + // means that we don't allow to drop the item in the selected + // range. However, the selection is hidden until the <input> or + // <textarea> gets focus, therefore, this looks odd. + return NS_OK; + } + } + + // Delete if user doesn't want to copy when user moves selected content + // to different place in same editor. + // XXX Do we need the check whether it's in same document or not? + RefPtr<TextEditor> editorToDeleteSelection; + if (sourceNode && sourceNode->IsEditable() && srcdoc == document) { + if ((dataTransfer->DropEffectInt() & + nsIDragService::DRAGDROP_ACTION_MOVE) && + !(dataTransfer->DropEffectInt() & + nsIDragService::DRAGDROP_ACTION_COPY)) { + // If the source node is in native anonymous tree, it must be in + // <input> or <textarea> element. If so, its TextEditor can remove it. + if (sourceNode->IsInNativeAnonymousSubtree()) { + if (RefPtr<TextControlElement> textControlElement = + TextControlElement::FromNodeOrNull( + sourceNode->GetClosestNativeAnonymousSubtreeRootParent())) { + editorToDeleteSelection = textControlElement->GetTextEditor(); + } + } + // Otherwise, must be the content is in HTMLEditor. + else if (AsHTMLEditor()) { + editorToDeleteSelection = this; + } else { + editorToDeleteSelection = + nsContentUtils::GetHTMLEditor(srcdoc->GetPresContext()); + } + } + // If the found editor isn't modifiable, we should not try to delete + // selection. + if (editorToDeleteSelection && !editorToDeleteSelection->IsModifiable()) { + editorToDeleteSelection = nullptr; + } + // If the found editor has collapsed selection, we need to delete nothing + // in the editor. + if (editorToDeleteSelection) { + if (Selection* selection = editorToDeleteSelection->GetSelection()) { + if (selection->IsCollapsed()) { + editorToDeleteSelection = nullptr; + } + } + } + } + + if (IsPlaintextEditor()) { + for (nsIContent* content = droppedAt.GetContainerAsContent(); content; + content = content->GetParent()) { + nsCOMPtr<nsIFormControl> formControl(do_QueryInterface(content)); + if (formControl && !formControl->AllowDrop()) { + // Don't allow dropping into a form control that doesn't allow being + // dropped into. + return NS_OK; + } + } + } + + // Combine any deletion and drop insertion into one transaction. + AutoPlaceholderBatch treatAsOneTransaction(*this, + ScrollSelectionIntoView::Yes); + + // Don't dispatch "selectionchange" event until inserting all contents. + SelectionBatcher selectionBatcher(SelectionRefPtr()); + + // Track dropped point with nsRange because we shouldn't insert the + // dropped content into different position even if some event listeners + // modify selection. Note that Chrome's behavior is really odd. So, + // we don't need to worry about web-compat about this. + IgnoredErrorResult ignoredError; + RefPtr<nsRange> rangeAtDropPoint = + nsRange::Create(droppedAt.ToRawRangeBoundary(), + droppedAt.ToRawRangeBoundary(), ignoredError); + if (NS_WARN_IF(ignoredError.Failed()) || + NS_WARN_IF(!rangeAtDropPoint->IsPositioned())) { + editActionData.Abort(); + return NS_ERROR_FAILURE; + } + + // Remove selected contents first here because we need to fire a pair of + // "beforeinput" and "input" for deletion and web apps can cancel only + // this deletion. Note that callee may handle insertion asynchronously. + // Therefore, it is the best to remove selected content here. + if (editorToDeleteSelection) { + nsresult rv = editorToDeleteSelection->DeleteSelectionByDragAsAction( + mDispatchInputEvent); + if (NS_WARN_IF(Destroyed())) { + editActionData.Abort(); + return NS_OK; + } + // Ignore the editor instance specific error if it's another editor. + if (this != editorToDeleteSelection && + (rv == NS_ERROR_NOT_INITIALIZED || rv == NS_ERROR_EDITOR_DESTROYED)) { + rv = NS_OK; + } + // Don't cancel "insertFromDrop" even if "deleteByDrag" is canceled. + if (rv != NS_ERROR_EDITOR_ACTION_CANCELED && NS_FAILED(rv)) { + NS_WARNING("TextEditor::DeleteSelectionByDragAsAction() failed"); + editActionData.Abort(); + return EditorBase::ToGenericNSResult(rv); + } + if (NS_WARN_IF(!rangeAtDropPoint->IsPositioned()) || + NS_WARN_IF(!rangeAtDropPoint->GetStartContainer()->IsContent())) { + editActionData.Abort(); + return NS_ERROR_FAILURE; + } + droppedAt = rangeAtDropPoint->StartRef(); + MOZ_ASSERT(droppedAt.IsSetAndValid()); + } + + // Before inserting dropping content, we need to move focus for compatibility + // with Chrome and firing "beforeinput" event on new editing host. + RefPtr<Element> focusedElement, newFocusedElement; + if (!AsHTMLEditor()) { + newFocusedElement = GetExposedRoot(); + focusedElement = IsActiveInDOMWindow() ? newFocusedElement : nullptr; + } else if (!AsHTMLEditor()->IsInDesignMode()) { + focusedElement = AsHTMLEditor()->GetActiveEditingHost(); + if (focusedElement && + droppedAt.GetContainerAsContent()->IsInclusiveDescendantOf( + focusedElement)) { + newFocusedElement = focusedElement; + } else { + newFocusedElement = droppedAt.GetContainerAsContent()->GetEditingHost(); + } + } + // Move selection right now. Note that this does not move focus because + // `Selection` moves focus with selection change only when the API caller is + // JS. And also this does not notify selection listeners (nor + // "selectionchange") since we created SelectionBatcher above. + ErrorResult error; + MOZ_KnownLive(SelectionRefPtr()) + ->SetStartAndEnd(droppedAt.ToRawRangeBoundary(), + droppedAt.ToRawRangeBoundary(), error); + if (error.Failed()) { + NS_WARNING("Selection::SetStartAndEnd() failed"); + editActionData.Abort(); + return error.StealNSResult(); + } + if (NS_WARN_IF(Destroyed())) { + editActionData.Abort(); + return NS_OK; + } + // Then, move focus if necessary. This must cause dispatching "blur" event + // and "focus" event. + if (newFocusedElement && focusedElement != newFocusedElement) { + RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager(); + DebugOnly<nsresult> rvIgnored = fm->SetFocus(newFocusedElement, 0); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored), + "nsFocusManager::SetFocus() failed to set focus " + "to the element, but ignored"); + if (NS_WARN_IF(Destroyed())) { + editActionData.Abort(); + return NS_OK; + } + // "blur" or "focus" event listener may have changed the value. + // Let's keep using the original point. + if (NS_WARN_IF(!rangeAtDropPoint->IsPositioned()) || + NS_WARN_IF(!rangeAtDropPoint->GetStartContainer()->IsContent())) { + return NS_ERROR_FAILURE; + } + droppedAt = rangeAtDropPoint->StartRef(); + MOZ_ASSERT(droppedAt.IsSetAndValid()); + + // If focus is changed to different element and we're handling drop in + // contenteditable, we cannot handle it without focus. So, we should give + // it up. + if (AsHTMLEditor() && !AsHTMLEditor()->IsInDesignMode() && + NS_WARN_IF(newFocusedElement != + AsHTMLEditor()->GetActiveEditingHost())) { + editActionData.Abort(); + return NS_OK; + } + } + + if (!AsHTMLEditor()) { + AutoTArray<nsString, 5> textArray; + textArray.SetCapacity(numItems); + uint32_t textLength = 0; + for (uint32_t i = 0; i < numItems; ++i) { + nsCOMPtr<nsIVariant> data; + dataTransfer->GetDataAtNoSecurityCheck(u"text/plain"_ns, i, + getter_AddRefs(data)); + if (!data) { + continue; + } + // Use nsString to avoid copying its storage to textArray. + nsString insertText; + data->GetAsAString(insertText); + if (insertText.IsEmpty()) { + continue; + } + textArray.AppendElement(insertText); + textLength += insertText.Length(); + } + // Use nsString to avoid copying its storage to editActionData. + nsString data; + data.SetCapacity(textLength); + // Join the text array from end to start because we insert each items + // in the dataTransfer at same point from start to end. Although I + // don't know whether this is intentional behavior. + for (nsString& text : Reversed(textArray)) { + data.Append(text); + } + // Use native line breaks for compatibility with Chrome. + // XXX Although, somebody has already converted native line breaks to + // XP line breaks. + editActionData.SetData(data); + + nsresult rv = editActionData.MaybeDispatchBeforeInputEvent(); + if (NS_FAILED(rv)) { + NS_WARNING_ASSERTION(rv == NS_ERROR_EDITOR_ACTION_CANCELED, + "MaybeDispatchBeforeInputEvent() failed"); + return EditorBase::ToGenericNSResult(rv); + } + + // Then, insert the text. Note that we shouldn't need to walk the array + // anymore because nobody should listen to mutation events of anonymous + // text node in <input>/<textarea>. + nsContentUtils::PlatformToDOMLineBreaks(data); + DebugOnly<nsresult> rvIgnored = InsertTextAt(data, droppedAt, false); + if (NS_WARN_IF(Destroyed())) { + return NS_OK; + } + NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored), + "TextEditor::InsertTextAt() failed, but ignored"); + } else { + editActionData.InitializeDataTransfer(dataTransfer); + RefPtr<StaticRange> targetRange = StaticRange::Create( + droppedAt.GetContainer(), droppedAt.Offset(), droppedAt.GetContainer(), + droppedAt.Offset(), IgnoreErrors()); + NS_WARNING_ASSERTION(targetRange && targetRange->IsPositioned(), + "Why did we fail to create collapsed static range at " + "dropped position?"); + if (targetRange && targetRange->IsPositioned()) { + editActionData.AppendTargetRange(*targetRange); + } + nsresult rv = editActionData.MaybeDispatchBeforeInputEvent(); + if (NS_FAILED(rv)) { + NS_WARNING_ASSERTION(rv == NS_ERROR_EDITOR_ACTION_CANCELED, + "MaybeDispatchBeforeInputEvent() failed"); + return EditorBase::ToGenericNSResult(rv); + } + RefPtr<HTMLEditor> htmlEditor(AsHTMLEditor()); + for (uint32_t i = 0; i < numItems; ++i) { + DebugOnly<nsresult> rvIgnored = htmlEditor->InsertFromDataTransfer( + dataTransfer, i, srcdoc, droppedAt, false); + if (NS_WARN_IF(Destroyed())) { + return NS_OK; + } + NS_WARNING_ASSERTION( + NS_SUCCEEDED(rvIgnored), + "HTMLEditor::InsertFromDataTransfer() failed, but ignored"); + } + } + + nsresult rv = ScrollSelectionFocusIntoView(); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), + "EditorBase::ScrollSelectionFocusIntoView() failed"); + return rv; +} + +nsresult TextEditor::DeleteSelectionByDragAsAction(bool aDispatchInputEvent) { + // TODO: Move this method to `EditorBase`. + AutoRestore<bool> saveDispatchInputEvent(mDispatchInputEvent); + mDispatchInputEvent = aDispatchInputEvent; + // Even if we're handling "deleteByDrag" in same editor as "insertFromDrop", + // we need to recreate edit action data here because + // `AutoEditActionDataSetter` needs to manage event state separately. + bool requestedByAnotherEditor = GetEditAction() != EditAction::eDrop; + AutoEditActionDataSetter editActionData(*this, EditAction::eDeleteByDrag); + MOZ_ASSERT(!SelectionRefPtr()->IsCollapsed()); + nsresult rv = editActionData.CanHandleAndMaybeDispatchBeforeInputEvent(); + if (NS_FAILED(rv)) { + NS_WARNING_ASSERTION(rv == NS_ERROR_EDITOR_ACTION_CANCELED, + "CanHandleAndMaybeDispatchBeforeInputEvent() failed"); + return rv; + } + // But keep using placeholder transaction for "insertFromDrop" if there is. + Maybe<AutoPlaceholderBatch> treatAsOneTransaction; + if (requestedByAnotherEditor) { + treatAsOneTransaction.emplace(*this, ScrollSelectionIntoView::Yes); + } + + rv = DeleteSelectionAsSubAction(nsIEditor::eNone, IsTextEditor() + ? nsIEditor::eNoStrip + : nsIEditor::eStrip); + if (NS_FAILED(rv)) { + NS_WARNING("EditorBase::DeleteSelectionAsSubAction(eNone) failed"); + return rv; + } + + if (!mDispatchInputEvent) { + return NS_OK; + } + + if (treatAsOneTransaction.isNothing()) { + DispatchInputEvent(); + } + return NS_WARN_IF(Destroyed()) ? NS_ERROR_EDITOR_DESTROYED : NS_OK; +} + +nsresult TextEditor::PasteAsAction(int32_t aClipboardType, + bool aDispatchPasteEvent, + nsIPrincipal* aPrincipal) { + AutoEditActionDataSetter editActionData(*this, EditAction::ePaste, + aPrincipal); + if (NS_WARN_IF(!editActionData.CanHandle())) { + return NS_ERROR_NOT_INITIALIZED; + } + + if (aDispatchPasteEvent) { + if (!FireClipboardEvent(ePaste, aClipboardType)) { + return EditorBase::ToGenericNSResult(NS_ERROR_EDITOR_ACTION_CANCELED); + } + } else { + // The caller must already have dispatched a "paste" event. + editActionData.NotifyOfDispatchingClipboardEvent(); + } + + if (AsHTMLEditor()) { + editActionData.InitializeDataTransferWithClipboard( + SettingDataTransfer::eWithFormat, aClipboardType); + nsresult rv = editActionData.CanHandleAndMaybeDispatchBeforeInputEvent(); + if (NS_FAILED(rv)) { + NS_WARNING_ASSERTION( + rv == NS_ERROR_EDITOR_ACTION_CANCELED, + "CanHandleAndMaybeDispatchBeforeInputEvent() failed"); + return EditorBase::ToGenericNSResult(rv); + } + rv = MOZ_KnownLive(AsHTMLEditor())->PasteInternal(aClipboardType); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), + "HTMLEditor::PasteInternal() failed"); + return EditorBase::ToGenericNSResult(rv); + } + + // The data will be initialized in InsertTextFromTransferable() if we're not + // an HTMLEditor. Therefore, we cannot dispatch "beforeinput" here. + + // Get Clipboard Service + nsresult rv; + nsCOMPtr<nsIClipboard> clipboard = + do_GetService("@mozilla.org/widget/clipboard;1", &rv); + if (NS_FAILED(rv)) { + NS_WARNING("Failed to get nsIClipboard service"); + return rv; + } + + // Get the nsITransferable interface for getting the data from the clipboard + nsCOMPtr<nsITransferable> transferable; + rv = PrepareTransferable(getter_AddRefs(transferable)); + if (NS_FAILED(rv)) { + NS_WARNING("TextEditor::PrepareTransferable() failed"); + return EditorBase::ToGenericNSResult(rv); + } + if (NS_WARN_IF(!transferable)) { + NS_WARNING( + "TextEditor::PrepareTransferable() returned nullptr, but ignored"); + return NS_OK; // XXX Why? + } + // Get the Data from the clipboard. + rv = clipboard->GetData(transferable, aClipboardType); + if (NS_FAILED(rv)) { + NS_WARNING("nsIClipboard::GetData() failed, but ignored"); + return NS_OK; // XXX Why? + } + // XXX Why don't we check this first? + if (!IsModifiable()) { + return NS_OK; + } + rv = InsertTextFromTransferable(transferable); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), + "TextEditor::InsertTextFromTransferable() failed"); + return EditorBase::ToGenericNSResult(rv); +} + +nsresult TextEditor::PasteTransferableAsAction(nsITransferable* aTransferable, + nsIPrincipal* aPrincipal) { + AutoEditActionDataSetter editActionData(*this, EditAction::ePaste, + aPrincipal); + // The data will be initialized in InsertTextFromTransferable(). Therefore, + // we cannot dispatch "beforeinput" here. + if (NS_WARN_IF(!editActionData.CanHandle())) { + return NS_ERROR_NOT_INITIALIZED; + } + + // Use an invalid value for the clipboard type as data comes from + // aTransferable and we don't currently implement a way to put that in the + // data transfer yet. + if (!FireClipboardEvent(ePaste, -1)) { + return EditorBase::ToGenericNSResult(NS_ERROR_EDITOR_ACTION_CANCELED); + } + + if (!IsModifiable()) { + return NS_OK; + } + + nsresult rv = InsertTextFromTransferable(aTransferable); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), + "TextEditor::InsertTextFromTransferable() failed"); + return EditorBase::ToGenericNSResult(rv); +} + +bool TextEditor::CanPaste(int32_t aClipboardType) const { + if (AreClipboardCommandsUnconditionallyEnabled()) { + return true; + } + + // can't paste if readonly + if (!IsModifiable()) { + return false; + } + + nsresult rv; + nsCOMPtr<nsIClipboard> clipboard( + do_GetService("@mozilla.org/widget/clipboard;1", &rv)); + if (NS_FAILED(rv)) { + NS_WARNING("Failed to get nsIClipboard service"); + return false; + } + + // the flavors that we can deal with + AutoTArray<nsCString, 1> textEditorFlavors = { + nsDependentCString(kUnicodeMime)}; + + bool haveFlavors; + rv = clipboard->HasDataMatchingFlavors(textEditorFlavors, aClipboardType, + &haveFlavors); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), + "nsIClipboard::HasDataMatchingFlavors() failed"); + return NS_SUCCEEDED(rv) && haveFlavors; +} + +bool TextEditor::CanPasteTransferable(nsITransferable* aTransferable) { + // can't paste if readonly + if (!IsModifiable()) { + return false; + } + + // If |aTransferable| is null, assume that a paste will succeed. + if (!aTransferable) { + return true; + } + + nsCOMPtr<nsISupports> data; + nsresult rv = + aTransferable->GetTransferData(kUnicodeMime, getter_AddRefs(data)); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), + "nsITransferable::GetTransferData(kUnicodeMime) failed"); + return NS_SUCCEEDED(rv) && data; +} + +bool TextEditor::IsSafeToInsertData(const Document* aSourceDoc) const { + // Try to determine whether we should use a sanitizing fragment sink + bool isSafe = false; + + RefPtr<Document> destdoc = GetDocument(); + NS_ASSERTION(destdoc, "Where is our destination doc?"); + + nsCOMPtr<nsIDocShell> docShell; + if (RefPtr<BrowsingContext> bc = destdoc->GetBrowsingContext()) { + RefPtr<BrowsingContext> root = bc->Top(); + MOZ_ASSERT(root, "root should not be null"); + + docShell = root->GetDocShell(); + } + + isSafe = docShell && docShell->GetAppType() == nsIDocShell::APP_TYPE_EDITOR; + + if (!isSafe && aSourceDoc) { + nsIPrincipal* srcPrincipal = aSourceDoc->NodePrincipal(); + nsIPrincipal* destPrincipal = destdoc->NodePrincipal(); + NS_ASSERTION(srcPrincipal && destPrincipal, + "How come we don't have a principal?"); + DebugOnly<nsresult> rvIgnored = + srcPrincipal->Subsumes(destPrincipal, &isSafe); + NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored), + "nsIPrincipal::Subsumes() failed, but ignored"); + } + + return isSafe; +} + +} // namespace mozilla |