gecko-dev/editor/libeditor/nsPlaintextDataTransfer.cpp

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C++

/* -*- 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/ArrayUtils.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/dom/Selection.h"
#include "nsAString.h"
#include "nsCOMPtr.h"
#include "nsCRT.h"
#include "nsComponentManagerUtils.h"
#include "nsContentUtils.h"
#include "nsDebug.h"
#include "nsEditor.h"
#include "nsEditorUtils.h"
#include "nsError.h"
#include "nsIClipboard.h"
#include "nsIContent.h"
#include "nsIDOMDataTransfer.h"
#include "nsIDOMDocument.h"
#include "nsIDOMDragEvent.h"
#include "nsIDOMEvent.h"
#include "nsIDOMNode.h"
#include "nsIDOMUIEvent.h"
#include "nsIDocument.h"
#include "nsIDragService.h"
#include "nsIDragSession.h"
#include "nsIEditor.h"
#include "nsIEditorIMESupport.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeItem.h"
#include "nsIPrincipal.h"
#include "nsIFormControl.h"
#include "nsIPlaintextEditor.h"
#include "nsISupportsPrimitives.h"
#include "nsITransferable.h"
#include "nsIVariant.h"
#include "nsLiteralString.h"
#include "nsPlaintextEditor.h"
#include "nsRange.h"
#include "nsSelectionState.h"
#include "nsServiceManagerUtils.h"
#include "nsString.h"
#include "nsXPCOM.h"
#include "nscore.h"
class nsILoadContext;
class nsISupports;
using namespace mozilla;
using namespace mozilla::dom;
NS_IMETHODIMP nsPlaintextEditor::PrepareTransferable(nsITransferable **transferable)
{
// Create generic Transferable for getting the data
nsresult rv = CallCreateInstance("@mozilla.org/widget/transferable;1", transferable);
NS_ENSURE_SUCCESS(rv, rv);
// Get the nsITransferable interface for getting the data from the clipboard
if (transferable) {
nsCOMPtr<nsIDocument> destdoc = GetDocument();
nsILoadContext* loadContext = destdoc ? destdoc->GetLoadContext() : nullptr;
(*transferable)->Init(loadContext);
(*transferable)->AddDataFlavor(kUnicodeMime);
(*transferable)->AddDataFlavor(kMozTextInternal);
};
return NS_OK;
}
nsresult nsPlaintextEditor::InsertTextAt(const nsAString &aStringToInsert,
nsIDOMNode *aDestinationNode,
int32_t aDestOffset,
bool aDoDeleteSelection)
{
if (aDestinationNode)
{
nsresult res;
nsRefPtr<Selection> selection = GetSelection();
NS_ENSURE_STATE(selection);
nsCOMPtr<nsIDOMNode> targetNode = aDestinationNode;
int32_t targetOffset = aDestOffset;
if (aDoDeleteSelection)
{
// Use an auto tracker so that our drop point is correctly
// positioned after the delete.
nsAutoTrackDOMPoint tracker(mRangeUpdater, &targetNode, &targetOffset);
res = DeleteSelection(eNone, eStrip);
NS_ENSURE_SUCCESS(res, res);
}
res = selection->Collapse(targetNode, targetOffset);
NS_ENSURE_SUCCESS(res, res);
}
return InsertText(aStringToInsert);
}
NS_IMETHODIMP nsPlaintextEditor::InsertTextFromTransferable(nsITransferable *aTransferable,
nsIDOMNode *aDestinationNode,
int32_t aDestOffset,
bool aDoDeleteSelection)
{
nsresult rv = NS_OK;
char* bestFlavor = nullptr;
nsCOMPtr<nsISupports> genericDataObj;
uint32_t len = 0;
if (NS_SUCCEEDED(aTransferable->GetAnyTransferData(&bestFlavor, getter_AddRefs(genericDataObj), &len))
&& bestFlavor && (0 == nsCRT::strcmp(bestFlavor, kUnicodeMime) ||
0 == nsCRT::strcmp(bestFlavor, kMozTextInternal)))
{
nsAutoTxnsConserveSelection dontSpazMySelection(this);
nsCOMPtr<nsISupportsString> textDataObj ( do_QueryInterface(genericDataObj) );
if (textDataObj && len > 0)
{
nsAutoString stuffToPaste;
textDataObj->GetData(stuffToPaste);
NS_ASSERTION(stuffToPaste.Length() <= (len/2), "Invalid length!");
// Sanitize possible carriage returns in the string to be inserted
nsContentUtils::PlatformToDOMLineBreaks(stuffToPaste);
nsAutoEditBatch beginBatching(this);
rv = InsertTextAt(stuffToPaste, aDestinationNode, aDestOffset, aDoDeleteSelection);
}
}
free(bestFlavor);
// Try to scroll the selection into view if the paste/drop succeeded
if (NS_SUCCEEDED(rv))
ScrollSelectionIntoView(false);
return rv;
}
nsresult nsPlaintextEditor::InsertFromDataTransfer(DataTransfer *aDataTransfer,
int32_t aIndex,
nsIDOMDocument *aSourceDoc,
nsIDOMNode *aDestinationNode,
int32_t aDestOffset,
bool aDoDeleteSelection)
{
nsCOMPtr<nsIVariant> data;
aDataTransfer->MozGetDataAt(NS_LITERAL_STRING("text/plain"), aIndex,
getter_AddRefs(data));
if (data) {
nsAutoString insertText;
data->GetAsAString(insertText);
nsContentUtils::PlatformToDOMLineBreaks(insertText);
nsAutoEditBatch beginBatching(this);
return InsertTextAt(insertText, aDestinationNode, aDestOffset, aDoDeleteSelection);
}
return NS_OK;
}
nsresult nsPlaintextEditor::InsertFromDrop(nsIDOMEvent* aDropEvent)
{
ForceCompositionEnd();
nsCOMPtr<nsIDOMDragEvent> dragEvent(do_QueryInterface(aDropEvent));
NS_ENSURE_TRUE(dragEvent, NS_ERROR_FAILURE);
nsCOMPtr<nsIDOMDataTransfer> domDataTransfer;
dragEvent->GetDataTransfer(getter_AddRefs(domDataTransfer));
nsCOMPtr<DataTransfer> dataTransfer = do_QueryInterface(domDataTransfer);
NS_ENSURE_TRUE(dataTransfer, NS_ERROR_FAILURE);
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
NS_ASSERTION(dragSession, "No drag session");
nsCOMPtr<nsIDOMNode> sourceNode;
dataTransfer->GetMozSourceNode(getter_AddRefs(sourceNode));
nsCOMPtr<nsIDOMDocument> srcdomdoc;
if (sourceNode) {
sourceNode->GetOwnerDocument(getter_AddRefs(srcdomdoc));
NS_ENSURE_TRUE(sourceNode, NS_ERROR_FAILURE);
}
if (nsContentUtils::CheckForSubFrameDrop(dragSession,
aDropEvent->GetInternalNSEvent()->AsDragEvent())) {
// Don't allow drags from subframe documents with different origins than
// the drop destination.
if (srcdomdoc && !IsSafeToInsertData(srcdomdoc))
return NS_OK;
}
// Current doc is destination
nsCOMPtr<nsIDOMDocument> destdomdoc = GetDOMDocument();
NS_ENSURE_TRUE(destdomdoc, NS_ERROR_NOT_INITIALIZED);
uint32_t numItems = 0;
nsresult rv = dataTransfer->GetMozItemCount(&numItems);
NS_ENSURE_SUCCESS(rv, rv);
if (numItems < 1) return NS_ERROR_FAILURE; // nothing to drop?
// Combine any deletion and drop insertion into one transaction
nsAutoEditBatch beginBatching(this);
bool deleteSelection = false;
// We have to figure out whether to delete and relocate caret only once
// Parent and offset are under the mouse cursor
nsCOMPtr<nsIDOMUIEvent> uiEvent = do_QueryInterface(aDropEvent);
NS_ENSURE_TRUE(uiEvent, NS_ERROR_FAILURE);
nsCOMPtr<nsIDOMNode> newSelectionParent;
rv = uiEvent->GetRangeParent(getter_AddRefs(newSelectionParent));
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(newSelectionParent, NS_ERROR_FAILURE);
int32_t newSelectionOffset;
rv = uiEvent->GetRangeOffset(&newSelectionOffset);
NS_ENSURE_SUCCESS(rv, rv);
nsRefPtr<Selection> selection = GetSelection();
NS_ENSURE_TRUE(selection, NS_ERROR_FAILURE);
bool isCollapsed = selection->Collapsed();
// Only the nsHTMLEditor::FindUserSelectAllNode returns a node.
nsCOMPtr<nsIDOMNode> userSelectNode = FindUserSelectAllNode(newSelectionParent);
if (userSelectNode)
{
// The drop is happening over a "-moz-user-select: all"
// subtree so make sure the content we insert goes before
// the root of the subtree.
//
// XXX: Note that inserting before the subtree matches the
// current behavior when dropping on top of an image.
// The decision for dropping before or after the
// subtree should really be done based on coordinates.
newSelectionParent = GetNodeLocation(userSelectNode, &newSelectionOffset);
NS_ENSURE_TRUE(newSelectionParent, NS_ERROR_FAILURE);
}
// Check if mouse is in the selection
// if so, jump through some hoops to determine if mouse is over selection (bail)
// and whether user wants to copy selection or delete it
if (!isCollapsed)
{
// We never have to delete if selection is already collapsed
bool cursorIsInSelection = false;
int32_t rangeCount;
rv = selection->GetRangeCount(&rangeCount);
NS_ENSURE_SUCCESS(rv, rv);
for (int32_t j = 0; j < rangeCount; j++)
{
nsRefPtr<nsRange> range = selection->GetRangeAt(j);
if (!range) {
// don't bail yet, iterate through them all
continue;
}
rv = range->IsPointInRange(newSelectionParent, newSelectionOffset, &cursorIsInSelection);
if (cursorIsInSelection)
break;
}
if (cursorIsInSelection)
{
// Dragging within same doc can't drop on itself -- leave!
if (srcdomdoc == destdomdoc)
return NS_OK;
// Dragging from another window onto a selection
// XXX Decision made to NOT do this,
// note that 4.x does replace if dropped on
//deleteSelection = true;
}
else
{
// We are NOT over the selection
if (srcdomdoc == destdomdoc)
{
// Within the same doc: delete if user doesn't want to copy
uint32_t dropEffect;
dataTransfer->GetDropEffectInt(&dropEffect);
deleteSelection = !(dropEffect & nsIDragService::DRAGDROP_ACTION_COPY);
}
else
{
// Different source doc: Don't delete
deleteSelection = false;
}
}
}
if (IsPlaintextEditor()) {
nsCOMPtr<nsIContent> content = do_QueryInterface(newSelectionParent);
while (content) {
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;
}
content = content->GetParent();
}
}
for (uint32_t i = 0; i < numItems; ++i) {
InsertFromDataTransfer(dataTransfer, i, srcdomdoc, newSelectionParent,
newSelectionOffset, deleteSelection);
}
if (NS_SUCCEEDED(rv))
ScrollSelectionIntoView(false);
return rv;
}
NS_IMETHODIMP nsPlaintextEditor::Paste(int32_t aSelectionType)
{
if (!FireClipboardEvent(NS_PASTE, aSelectionType))
return NS_OK;
// Get Clipboard Service
nsresult rv;
nsCOMPtr<nsIClipboard> clipboard(do_GetService("@mozilla.org/widget/clipboard;1", &rv));
if ( NS_FAILED(rv) )
return rv;
// Get the nsITransferable interface for getting the data from the clipboard
nsCOMPtr<nsITransferable> trans;
rv = PrepareTransferable(getter_AddRefs(trans));
if (NS_SUCCEEDED(rv) && trans)
{
// Get the Data from the clipboard
if (NS_SUCCEEDED(clipboard->GetData(trans, aSelectionType)) && IsModifiable())
{
// handle transferable hooks
nsCOMPtr<nsIDOMDocument> domdoc = GetDOMDocument();
if (!nsEditorHookUtils::DoInsertionHook(domdoc, nullptr, trans))
return NS_OK;
rv = InsertTextFromTransferable(trans, nullptr, 0, true);
}
}
return rv;
}
NS_IMETHODIMP nsPlaintextEditor::PasteTransferable(nsITransferable *aTransferable)
{
// 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(NS_PASTE, -1))
return NS_OK;
if (!IsModifiable())
return NS_OK;
// handle transferable hooks
nsCOMPtr<nsIDOMDocument> domdoc = GetDOMDocument();
if (!nsEditorHookUtils::DoInsertionHook(domdoc, nullptr, aTransferable))
return NS_OK;
return InsertTextFromTransferable(aTransferable, nullptr, 0, true);
}
NS_IMETHODIMP nsPlaintextEditor::CanPaste(int32_t aSelectionType, bool *aCanPaste)
{
NS_ENSURE_ARG_POINTER(aCanPaste);
*aCanPaste = false;
// can't paste if readonly
if (!IsModifiable())
return NS_OK;
nsresult rv;
nsCOMPtr<nsIClipboard> clipboard(do_GetService("@mozilla.org/widget/clipboard;1", &rv));
NS_ENSURE_SUCCESS(rv, rv);
// the flavors that we can deal with
const char* textEditorFlavors[] = { kUnicodeMime };
bool haveFlavors;
rv = clipboard->HasDataMatchingFlavors(textEditorFlavors,
ArrayLength(textEditorFlavors),
aSelectionType, &haveFlavors);
NS_ENSURE_SUCCESS(rv, rv);
*aCanPaste = haveFlavors;
return NS_OK;
}
NS_IMETHODIMP nsPlaintextEditor::CanPasteTransferable(nsITransferable *aTransferable, bool *aCanPaste)
{
NS_ENSURE_ARG_POINTER(aCanPaste);
// can't paste if readonly
if (!IsModifiable()) {
*aCanPaste = false;
return NS_OK;
}
// If |aTransferable| is null, assume that a paste will succeed.
if (!aTransferable) {
*aCanPaste = true;
return NS_OK;
}
nsCOMPtr<nsISupports> data;
uint32_t dataLen;
nsresult rv = aTransferable->GetTransferData(kUnicodeMime,
getter_AddRefs(data),
&dataLen);
if (NS_SUCCEEDED(rv) && data)
*aCanPaste = true;
else
*aCanPaste = false;
return NS_OK;
}
bool nsPlaintextEditor::IsSafeToInsertData(nsIDOMDocument* aSourceDoc)
{
// Try to determine whether we should use a sanitizing fragment sink
bool isSafe = false;
nsCOMPtr<nsIDocument> destdoc = GetDocument();
NS_ASSERTION(destdoc, "Where is our destination doc?");
nsCOMPtr<nsIDocShellTreeItem> dsti = destdoc->GetDocShell();
nsCOMPtr<nsIDocShellTreeItem> root;
if (dsti)
dsti->GetRootTreeItem(getter_AddRefs(root));
nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(root);
uint32_t appType;
if (docShell && NS_SUCCEEDED(docShell->GetAppType(&appType)))
isSafe = appType == nsIDocShell::APP_TYPE_EDITOR;
if (!isSafe && aSourceDoc) {
nsCOMPtr<nsIDocument> srcdoc = do_QueryInterface(aSourceDoc);
NS_ASSERTION(srcdoc, "Where is our source doc?");
nsIPrincipal* srcPrincipal = srcdoc->NodePrincipal();
nsIPrincipal* destPrincipal = destdoc->NodePrincipal();
NS_ASSERTION(srcPrincipal && destPrincipal, "How come we don't have a principal?");
srcPrincipal->Subsumes(destPrincipal, &isSafe);
}
return isSafe;
}