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fune/widget/gtk/nsDragService.cpp
Nicholas Nethercote 8a72cf2251 Bug 1390428 (part 2, attempt 2) - Remove more nsXPIDLCString local variables. r=erahm. 
--HG--
extra : rebase_source : 69d58b0cfb56efc6b03d8e2d7be2ce3c3e6cd843
2017-08-21 20:01:27 +10:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=4 et sw=4 tw=80: */
/* 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 "nsDragService.h"
#include "nsArrayUtils.h"
#include "nsIObserverService.h"
#include "nsWidgetsCID.h"
#include "nsWindow.h"
#include "nsIServiceManager.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsIIOService.h"
#include "nsIFileURL.h"
#include "nsNetUtil.h"
#include "mozilla/Logging.h"
#include "nsTArray.h"
#include "nsPrimitiveHelpers.h"
#include "prtime.h"
#include "prthread.h"
#include <dlfcn.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#include "nsCRT.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/Services.h"
#include "mozilla/ClearOnShutdown.h"
#include "gfxXlibSurface.h"
#include "gfxContext.h"
#include "nsImageToPixbuf.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsISelection.h"
#include "nsViewManager.h"
#include "nsIFrame.h"
#include "nsGtkUtils.h"
#include "nsGtkKeyUtils.h"
#include "mozilla/gfx/2D.h"
#include "gfxPlatform.h"
#include "ScreenHelperGTK.h"
#include "nsArrayUtils.h"
using namespace mozilla;
using namespace mozilla::gfx;
// This sets how opaque the drag image is
#define DRAG_IMAGE_ALPHA_LEVEL 0.5
// These values are copied from GtkDragResult (rather than using GtkDragResult
// directly) so that this code can be compiled against versions of GTK+ that
// do not have GtkDragResult.
// GtkDragResult is available from GTK+ version 2.12.
enum {
MOZ_GTK_DRAG_RESULT_SUCCESS,
MOZ_GTK_DRAG_RESULT_NO_TARGET
};
static LazyLogModule sDragLm("nsDragService");
// data used for synthetic periodic motion events sent to the source widget
// grabbing real events for the drag.
static guint sMotionEventTimerID;
static GdkEvent *sMotionEvent;
static GtkWidget *sGrabWidget;
static const char gMimeListType[] = "application/x-moz-internal-item-list";
static const char gMozUrlType[] = "_NETSCAPE_URL";
static const char gTextUriListType[] = "text/uri-list";
static const char gTextPlainUTF8Type[] = "text/plain;charset=utf-8";
static void
invisibleSourceDragBegin(GtkWidget *aWidget,
GdkDragContext *aContext,
gpointer aData);
static void
invisibleSourceDragEnd(GtkWidget *aWidget,
GdkDragContext *aContext,
gpointer aData);
static gboolean
invisibleSourceDragFailed(GtkWidget *aWidget,
GdkDragContext *aContext,
gint aResult,
gpointer aData);
static void
invisibleSourceDragDataGet(GtkWidget *aWidget,
GdkDragContext *aContext,
GtkSelectionData *aSelectionData,
guint aInfo,
guint32 aTime,
gpointer aData);
nsDragService::nsDragService()
: mScheduledTask(eDragTaskNone)
, mTaskSource(0)
{
// We have to destroy the hidden widget before the event loop stops
// running.
nsCOMPtr<nsIObserverService> obsServ =
mozilla::services::GetObserverService();
obsServ->AddObserver(this, "quit-application", false);
// our hidden source widget
#if (MOZ_WIDGET_GTK == 2)
mHiddenWidget = gtk_window_new(GTK_WINDOW_POPUP);
#else
// Using an offscreen window works around bug 983843.
mHiddenWidget = gtk_offscreen_window_new();
#endif
// make sure that the widget is realized so that
// we can use it as a drag source.
gtk_widget_realize(mHiddenWidget);
// hook up our internal signals so that we can get some feedback
// from our drag source
g_signal_connect(mHiddenWidget, "drag_begin",
G_CALLBACK(invisibleSourceDragBegin), this);
g_signal_connect(mHiddenWidget, "drag_data_get",
G_CALLBACK(invisibleSourceDragDataGet), this);
g_signal_connect(mHiddenWidget, "drag_end",
G_CALLBACK(invisibleSourceDragEnd), this);
// drag-failed is available from GTK+ version 2.12
guint dragFailedID = g_signal_lookup("drag-failed",
G_TYPE_FROM_INSTANCE(mHiddenWidget));
if (dragFailedID) {
g_signal_connect_closure_by_id(mHiddenWidget, dragFailedID, 0,
g_cclosure_new(G_CALLBACK(invisibleSourceDragFailed),
this, nullptr),
FALSE);
}
// set up our logging module
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::nsDragService"));
mCanDrop = false;
mTargetDragDataReceived = false;
mTargetDragData = 0;
mTargetDragDataLen = 0;
}
nsDragService::~nsDragService()
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::~nsDragService"));
if (mTaskSource)
g_source_remove(mTaskSource);
}
NS_IMPL_ISUPPORTS_INHERITED(nsDragService, nsBaseDragService, nsIObserver)
mozilla::StaticRefPtr<nsDragService> sDragServiceInstance;
/* static */ already_AddRefed<nsDragService>
nsDragService::GetInstance()
{
if (gfxPlatform::IsHeadless()) {
return nullptr;
}
if (!sDragServiceInstance) {
sDragServiceInstance = new nsDragService();
ClearOnShutdown(&sDragServiceInstance);
}
RefPtr<nsDragService> service = sDragServiceInstance.get();
return service.forget();
}
// nsIObserver
NS_IMETHODIMP
nsDragService::Observe(nsISupports *aSubject, const char *aTopic,
const char16_t *aData)
{
if (!nsCRT::strcmp(aTopic, "quit-application")) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("nsDragService::Observe(\"quit-application\")"));
if (mHiddenWidget) {
gtk_widget_destroy(mHiddenWidget);
mHiddenWidget = 0;
}
TargetResetData();
} else {
NS_NOTREACHED("unexpected topic");
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
// Support for periodic drag events
// http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#drag-and-drop-processing-model
// and the Xdnd protocol both recommend that drag events are sent periodically,
// but GTK does not normally provide this.
//
// Here GTK is periodically stimulated by copies of the most recent mouse
// motion events so as to send drag position messages to the destination when
// appropriate (after it has received a status event from the previous
// message).
//
// (If events were sent only on the destination side then the destination
// would have no message to which it could reply with a drag status. Without
// sending a drag status to the source, the destination would not be able to
// change its feedback re whether it could accept the drop, and so the
// source's behavior on drop will not be consistent.)
static gboolean
DispatchMotionEventCopy(gpointer aData)
{
// Clear the timer id before OnSourceGrabEventAfter is called during event
// dispatch.
sMotionEventTimerID = 0;
GdkEvent *event = sMotionEvent;
sMotionEvent = nullptr;
// If there is no longer a grab on the widget, then the drag is over and
// there is no need to continue drag motion.
if (gtk_widget_has_grab(sGrabWidget)) {
gtk_propagate_event(sGrabWidget, event);
}
gdk_event_free(event);
// Cancel this timer;
// We've already started another if the motion event was dispatched.
return FALSE;
}
static void
OnSourceGrabEventAfter(GtkWidget *widget, GdkEvent *event, gpointer user_data)
{
// If there is no longer a grab on the widget, then the drag motion is
// over (though the data may not be fetched yet).
if (!gtk_widget_has_grab(sGrabWidget))
return;
if (event->type == GDK_MOTION_NOTIFY) {
if (sMotionEvent) {
gdk_event_free(sMotionEvent);
}
sMotionEvent = gdk_event_copy(event);
// Update the cursor position. The last of these recorded gets used for
// the eDragEnd event.
nsDragService *dragService = static_cast<nsDragService*>(user_data);
gint scale = ScreenHelperGTK::GetGTKMonitorScaleFactor();
auto p = LayoutDeviceIntPoint::Round(event->motion.x_root * scale,
event->motion.y_root * scale);
dragService->SetDragEndPoint(p);
} else if (sMotionEvent && (event->type == GDK_KEY_PRESS ||
event->type == GDK_KEY_RELEASE)) {
// Update modifier state from key events.
sMotionEvent->motion.state = event->key.state;
} else {
return;
}
if (sMotionEventTimerID) {
g_source_remove(sMotionEventTimerID);
}
// G_PRIORITY_DEFAULT_IDLE is lower priority than GDK's redraw idle source
// and lower than GTK's idle source that sends drag position messages after
// motion-notify signals.
//
// http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#drag-and-drop-processing-model
// recommends an interval of 350ms +/- 200ms.
sMotionEventTimerID =
g_timeout_add_full(G_PRIORITY_DEFAULT_IDLE, 350,
DispatchMotionEventCopy, nullptr, nullptr);
}
static GtkWindow*
GetGtkWindow(nsIDOMDocument *aDocument)
{
nsCOMPtr<nsIDocument> doc = do_QueryInterface(aDocument);
if (!doc)
return nullptr;
nsCOMPtr<nsIPresShell> presShell = doc->GetShell();
if (!presShell)
return nullptr;
RefPtr<nsViewManager> vm = presShell->GetViewManager();
if (!vm)
return nullptr;
nsCOMPtr<nsIWidget> widget;
vm->GetRootWidget(getter_AddRefs(widget));
if (!widget)
return nullptr;
GtkWidget *gtkWidget =
static_cast<nsWindow*>(widget.get())->GetMozContainerWidget();
if (!gtkWidget)
return nullptr;
GtkWidget *toplevel = nullptr;
toplevel = gtk_widget_get_toplevel(gtkWidget);
if (!GTK_IS_WINDOW(toplevel))
return nullptr;
return GTK_WINDOW(toplevel);
}
// nsIDragService
NS_IMETHODIMP
nsDragService::InvokeDragSession(nsIDOMNode *aDOMNode,
nsIArray * aArrayTransferables,
nsIScriptableRegion * aRegion,
uint32_t aActionType,
nsContentPolicyType aContentPolicyType =
nsIContentPolicy::TYPE_OTHER)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::InvokeDragSession"));
// If the previous source drag has not yet completed, signal handlers need
// to be removed from sGrabWidget and dragend needs to be dispatched to
// the source node, but we can't call EndDragSession yet because we don't
// know whether or not the drag succeeded.
if (mSourceNode)
return NS_ERROR_NOT_AVAILABLE;
return nsBaseDragService::InvokeDragSession(aDOMNode, aArrayTransferables,
aRegion, aActionType,
aContentPolicyType);
}
// nsBaseDragService
nsresult
nsDragService::InvokeDragSessionImpl(nsIArray* aArrayTransferables,
nsIScriptableRegion* aRegion,
uint32_t aActionType)
{
// make sure that we have an array of transferables to use
if (!aArrayTransferables)
return NS_ERROR_INVALID_ARG;
// set our reference to the transferables. this will also addref
// the transferables since we're going to hang onto this beyond the
// length of this call
mSourceDataItems = aArrayTransferables;
// get the list of items we offer for drags
GtkTargetList *sourceList = GetSourceList();
if (!sourceList)
return NS_OK;
// stored temporarily until the drag-begin signal has been received
mSourceRegion = aRegion;
// save our action type
GdkDragAction action = GDK_ACTION_DEFAULT;
if (aActionType & DRAGDROP_ACTION_COPY)
action = (GdkDragAction)(action | GDK_ACTION_COPY);
if (aActionType & DRAGDROP_ACTION_MOVE)
action = (GdkDragAction)(action | GDK_ACTION_MOVE);
if (aActionType & DRAGDROP_ACTION_LINK)
action = (GdkDragAction)(action | GDK_ACTION_LINK);
// Create a fake event for the drag so we can pass the time (so to speak).
// If we don't do this, then, when the timestamp for the pending button
// release event is used for the ungrab, the ungrab can fail due to the
// timestamp being _earlier_ than CurrentTime.
GdkEvent event;
memset(&event, 0, sizeof(GdkEvent));
event.type = GDK_BUTTON_PRESS;
event.button.window = gtk_widget_get_window(mHiddenWidget);
event.button.time = nsWindow::GetLastUserInputTime();
// Put the drag widget in the window group of the source node so that the
// gtk_grab_add during gtk_drag_begin is effective.
// gtk_window_get_group(nullptr) returns the default window group.
GtkWindowGroup *window_group =
gtk_window_get_group(GetGtkWindow(mSourceDocument));
gtk_window_group_add_window(window_group,
GTK_WINDOW(mHiddenWidget));
#if (MOZ_WIDGET_GTK == 3)
// Get device for event source
GdkDisplay *display = gdk_display_get_default();
GdkDeviceManager *device_manager = gdk_display_get_device_manager(display);
event.button.device = gdk_device_manager_get_client_pointer(device_manager);
#endif
// start our drag.
GdkDragContext *context = gtk_drag_begin(mHiddenWidget,
sourceList,
action,
1,
&event);
mSourceRegion = nullptr;
nsresult rv;
if (context) {
StartDragSession();
// GTK uses another hidden window for receiving mouse events.
sGrabWidget = gtk_window_group_get_current_grab(window_group);
if (sGrabWidget) {
g_object_ref(sGrabWidget);
// Only motion and key events are required but connect to
// "event-after" as this is never blocked by other handlers.
g_signal_connect(sGrabWidget, "event-after",
G_CALLBACK(OnSourceGrabEventAfter), this);
}
// We don't have a drag end point yet.
mEndDragPoint = LayoutDeviceIntPoint(-1, -1);
rv = NS_OK;
}
else {
rv = NS_ERROR_FAILURE;
}
gtk_target_list_unref(sourceList);
return rv;
}
bool
nsDragService::SetAlphaPixmap(SourceSurface *aSurface,
GdkDragContext *aContext,
int32_t aXOffset,
int32_t aYOffset,
const LayoutDeviceIntRect& dragRect)
{
GdkScreen* screen = gtk_widget_get_screen(mHiddenWidget);
// Transparent drag icons need, like a lot of transparency-related things,
// a compositing X window manager
if (!gdk_screen_is_composited(screen))
return false;
#if (MOZ_WIDGET_GTK == 2)
GdkColormap* alphaColormap = gdk_screen_get_rgba_colormap(screen);
if (!alphaColormap)
return false;
GdkPixmap* pixmap = gdk_pixmap_new(nullptr, dragRect.width, dragRect.height,
gdk_colormap_get_visual(alphaColormap)->depth);
if (!pixmap)
return false;
gdk_drawable_set_colormap(GDK_DRAWABLE(pixmap), alphaColormap);
// Make a DrawTarget wrapped around the pixmap to render on
RefPtr<DrawTarget> dt =
nsWindow::GetDrawTargetForGdkDrawable(GDK_DRAWABLE(pixmap),
IntSize(dragRect.width,
dragRect.height));
if (!dt)
return false;
// Clear it...
dt->ClearRect(Rect(0, 0, dragRect.width, dragRect.height));
// ...and paint the drag image with translucency
dt->DrawSurface(aSurface,
Rect(0, 0, dragRect.width, dragRect.height),
Rect(0, 0, dragRect.width, dragRect.height),
DrawSurfaceOptions(),
DrawOptions(DRAG_IMAGE_ALPHA_LEVEL, CompositionOp::OP_SOURCE));
// The drag transaction addrefs the pixmap, so we can just unref it from us here
gtk_drag_set_icon_pixmap(aContext, alphaColormap, pixmap, nullptr,
aXOffset, aYOffset);
g_object_unref(pixmap);
return true;
#else
#ifdef cairo_image_surface_create
#error "Looks like we're including Mozilla's cairo instead of system cairo"
#endif
// Prior to GTK 3.9.12, cairo surfaces passed into gtk_drag_set_icon_surface
// had their shape information derived from the alpha channel and used with
// the X SHAPE extension instead of being displayed as an ARGB window.
// See bug 1249604.
if (gtk_check_version(3, 9, 12))
return false;
// TODO: grab X11 pixmap or image data instead of expensive readback.
cairo_surface_t *surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
dragRect.width,
dragRect.height);
if (!surf)
return false;
RefPtr<DrawTarget> dt = gfxPlatform::CreateDrawTargetForData(
cairo_image_surface_get_data(surf),
nsIntSize(dragRect.width, dragRect.height),
cairo_image_surface_get_stride(surf),
SurfaceFormat::B8G8R8A8);
if (!dt)
return false;
dt->ClearRect(Rect(0, 0, dragRect.width, dragRect.height));
dt->DrawSurface(aSurface,
Rect(0, 0, dragRect.width, dragRect.height),
Rect(0, 0, dragRect.width, dragRect.height),
DrawSurfaceOptions(),
DrawOptions(DRAG_IMAGE_ALPHA_LEVEL, CompositionOp::OP_SOURCE));
cairo_surface_mark_dirty(surf);
cairo_surface_set_device_offset(surf, -aXOffset, -aYOffset);
// Ensure that the surface is drawn at the correct scale on HiDPI displays.
static auto sCairoSurfaceSetDeviceScalePtr =
(void (*)(cairo_surface_t*,double,double))
dlsym(RTLD_DEFAULT, "cairo_surface_set_device_scale");
if (sCairoSurfaceSetDeviceScalePtr) {
gint scale = ScreenHelperGTK::GetGTKMonitorScaleFactor();
sCairoSurfaceSetDeviceScalePtr(surf, scale, scale);
}
gtk_drag_set_icon_surface(aContext, surf);
cairo_surface_destroy(surf);
return true;
#endif
}
NS_IMETHODIMP
nsDragService::StartDragSession()
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::StartDragSession"));
return nsBaseDragService::StartDragSession();
}
NS_IMETHODIMP
nsDragService::EndDragSession(bool aDoneDrag, uint32_t aKeyModifiers)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::EndDragSession %d",
aDoneDrag));
if (sGrabWidget) {
g_signal_handlers_disconnect_by_func(sGrabWidget,
FuncToGpointer(OnSourceGrabEventAfter), this);
g_object_unref(sGrabWidget);
sGrabWidget = nullptr;
if (sMotionEventTimerID) {
g_source_remove(sMotionEventTimerID);
sMotionEventTimerID = 0;
}
if (sMotionEvent) {
gdk_event_free(sMotionEvent);
sMotionEvent = nullptr;
}
}
// unset our drag action
SetDragAction(DRAGDROP_ACTION_NONE);
// We're done with the drag context.
mTargetDragContextForRemote = nullptr;
return nsBaseDragService::EndDragSession(aDoneDrag, aKeyModifiers);
}
// nsIDragSession
NS_IMETHODIMP
nsDragService::SetCanDrop(bool aCanDrop)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::SetCanDrop %d",
aCanDrop));
mCanDrop = aCanDrop;
return NS_OK;
}
NS_IMETHODIMP
nsDragService::GetCanDrop(bool *aCanDrop)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::GetCanDrop"));
*aCanDrop = mCanDrop;
return NS_OK;
}
static void
UTF16ToNewUTF8(const char16_t* aUTF16,
uint32_t aUTF16Len,
char** aUTF8,
uint32_t* aUTF8Len)
{
nsDependentSubstring utf16(aUTF16, aUTF16Len);
*aUTF8 = ToNewUTF8String(utf16, aUTF8Len);
}
static void
UTF8ToNewUTF16(const char* aUTF8,
uint32_t aUTF8Len,
char16_t** aUTF16,
uint32_t* aUTF16Len)
{
nsDependentCSubstring utf8(aUTF8, aUTF8Len);
*aUTF16 = UTF8ToNewUnicode(utf8, aUTF16Len);
}
// count the number of URIs in some text/uri-list format data.
static uint32_t
CountTextUriListItems(const char *data,
uint32_t datalen)
{
const char *p = data;
const char *endPtr = p + datalen;
uint32_t count = 0;
while (p < endPtr) {
// skip whitespace (if any)
while (p < endPtr && *p != '\0' && isspace(*p))
p++;
// if we aren't at the end of the line ...
if (p != endPtr && *p != '\0' && *p != '\n' && *p != '\r')
count++;
// skip to the end of the line
while (p < endPtr && *p != '\0' && *p != '\n')
p++;
p++; // skip the actual newline as well.
}
return count;
}
// extract an item from text/uri-list formatted data and convert it to
// unicode.
static void
GetTextUriListItem(const char *data,
uint32_t datalen,
uint32_t aItemIndex,
char16_t **convertedText,
uint32_t *convertedTextLen)
{
const char *p = data;
const char *endPtr = p + datalen;
unsigned int count = 0;
*convertedText = nullptr;
while (p < endPtr) {
// skip whitespace (if any)
while (p < endPtr && *p != '\0' && isspace(*p))
p++;
// if we aren't at the end of the line, we have a url
if (p != endPtr && *p != '\0' && *p != '\n' && *p != '\r')
count++;
// this is the item we are after ...
if (aItemIndex + 1 == count) {
const char *q = p;
while (q < endPtr && *q != '\0' && *q != '\n' && *q != '\r')
q++;
UTF8ToNewUTF16(p, q - p, convertedText, convertedTextLen);
break;
}
// skip to the end of the line
while (p < endPtr && *p != '\0' && *p != '\n')
p++;
p++; // skip the actual newline as well.
}
// didn't find the desired item, so just pass the whole lot
if (!*convertedText) {
UTF8ToNewUTF16(data, datalen, convertedText, convertedTextLen);
}
}
NS_IMETHODIMP
nsDragService::GetNumDropItems(uint32_t * aNumItems)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::GetNumDropItems"));
if (!mTargetWidget) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("*** warning: GetNumDropItems \
called without a valid target widget!\n"));
*aNumItems = 0;
return NS_OK;
}
bool isList = IsTargetContextList();
if (isList)
mSourceDataItems->GetLength(aNumItems);
else {
GdkAtom gdkFlavor = gdk_atom_intern(gTextUriListType, FALSE);
GetTargetDragData(gdkFlavor);
if (mTargetDragData) {
const char *data = reinterpret_cast<char*>(mTargetDragData);
*aNumItems = CountTextUriListItems(data, mTargetDragDataLen);
} else
*aNumItems = 1;
}
MOZ_LOG(sDragLm, LogLevel::Debug, ("%d items", *aNumItems));
return NS_OK;
}
NS_IMETHODIMP
nsDragService::GetData(nsITransferable * aTransferable,
uint32_t aItemIndex)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::GetData %d", aItemIndex));
// make sure that we have a transferable
if (!aTransferable)
return NS_ERROR_INVALID_ARG;
if (!mTargetWidget) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("*** warning: GetData \
called without a valid target widget!\n"));
return NS_ERROR_FAILURE;
}
// get flavor list that includes all acceptable flavors (including
// ones obtained through conversion). Flavors are nsISupportsStrings
// so that they can be seen from JS.
nsCOMPtr<nsIArray> flavorList;
nsresult rv = aTransferable->FlavorsTransferableCanImport(
getter_AddRefs(flavorList));
if (NS_FAILED(rv))
return rv;
// count the number of flavors
uint32_t cnt;
flavorList->GetLength(&cnt);
unsigned int i;
// check to see if this is an internal list
bool isList = IsTargetContextList();
if (isList) {
MOZ_LOG(sDragLm, LogLevel::Debug, ("it's a list..."));
// find a matching flavor
for (i = 0; i < cnt; ++i) {
nsCOMPtr<nsISupportsCString> currentFlavor;
currentFlavor = do_QueryElementAt(flavorList, i);
if (!currentFlavor)
continue;
nsCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
MOZ_LOG(sDragLm,
LogLevel::Debug,
("flavor is %s\n", flavorStr.get()));
// get the item with the right index
nsCOMPtr<nsITransferable> item =
do_QueryElementAt(mSourceDataItems, aItemIndex);
if (!item)
continue;
nsCOMPtr<nsISupports> data;
uint32_t tmpDataLen = 0;
MOZ_LOG(sDragLm, LogLevel::Debug,
("trying to get transfer data for %s\n",
flavorStr.get()));
rv = item->GetTransferData(flavorStr.get(),
getter_AddRefs(data),
&tmpDataLen);
if (NS_FAILED(rv)) {
MOZ_LOG(sDragLm, LogLevel::Debug, ("failed.\n"));
continue;
}
MOZ_LOG(sDragLm, LogLevel::Debug, ("succeeded.\n"));
rv = aTransferable->SetTransferData(flavorStr.get(), data,
tmpDataLen);
if (NS_FAILED(rv)) {
MOZ_LOG(sDragLm,
LogLevel::Debug,
("fail to set transfer data into transferable!\n"));
continue;
}
// ok, we got the data
return NS_OK;
}
// if we got this far, we failed
return NS_ERROR_FAILURE;
}
// Now walk down the list of flavors. When we find one that is
// actually present, copy out the data into the transferable in that
// format. SetTransferData() implicitly handles conversions.
for ( i = 0; i < cnt; ++i ) {
nsCOMPtr<nsISupportsCString> currentFlavor;
currentFlavor = do_QueryElementAt(flavorList, i);
if (currentFlavor) {
// find our gtk flavor
nsCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
GdkAtom gdkFlavor = gdk_atom_intern(flavorStr.get(), FALSE);
MOZ_LOG(sDragLm, LogLevel::Debug,
("looking for data in type %s, gdk flavor %p\n",
flavorStr.get(), gdkFlavor));
bool dataFound = false;
if (gdkFlavor) {
GetTargetDragData(gdkFlavor);
}
if (mTargetDragData) {
MOZ_LOG(sDragLm, LogLevel::Debug, ("dataFound = true\n"));
dataFound = true;
}
else {
MOZ_LOG(sDragLm, LogLevel::Debug, ("dataFound = false\n"));
// Dragging and dropping from the file manager would cause us
// to parse the source text as a nsIFile URL.
if (flavorStr.EqualsLiteral(kFileMime)) {
gdkFlavor = gdk_atom_intern(kTextMime, FALSE);
GetTargetDragData(gdkFlavor);
if (!mTargetDragData) {
gdkFlavor = gdk_atom_intern(gTextUriListType, FALSE);
GetTargetDragData(gdkFlavor);
}
if (mTargetDragData) {
const char* text = static_cast<char*>(mTargetDragData);
char16_t* convertedText = nullptr;
uint32_t convertedTextLen = 0;
GetTextUriListItem(text, mTargetDragDataLen, aItemIndex,
&convertedText, &convertedTextLen);
if (convertedText) {
nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
nsCOMPtr<nsIURI> fileURI;
rv = ioService->NewURI(NS_ConvertUTF16toUTF8(convertedText),
nullptr, nullptr, getter_AddRefs(fileURI));
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(fileURI, &rv);
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIFile> file;
rv = fileURL->GetFile(getter_AddRefs(file));
if (NS_SUCCEEDED(rv)) {
// The common wrapping code at the end of
// this function assumes the data is text
// and calls text-specific operations.
// Make a secret hideout here for nsIFile
// objects and return early.
aTransferable->SetTransferData(flavorStr.get(), file,
convertedTextLen);
g_free(convertedText);
return NS_OK;
}
}
}
g_free(convertedText);
}
continue;
}
}
// if we are looking for text/unicode and we fail to find it
// on the clipboard first, try again with text/plain. If that
// is present, convert it to unicode.
if (flavorStr.EqualsLiteral(kUnicodeMime)) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("we were looking for text/unicode... \
trying with text/plain;charset=utf-8\n"));
gdkFlavor = gdk_atom_intern(gTextPlainUTF8Type, FALSE);
GetTargetDragData(gdkFlavor);
if (mTargetDragData) {
MOZ_LOG(sDragLm, LogLevel::Debug, ("Got textplain data\n"));
const char* castedText =
reinterpret_cast<char*>(mTargetDragData);
char16_t* convertedText = nullptr;
NS_ConvertUTF8toUTF16 ucs2string(castedText,
mTargetDragDataLen);
convertedText = ToNewUnicode(ucs2string);
if ( convertedText ) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("successfully converted plain text \
to unicode.\n"));
// out with the old, in with the new
g_free(mTargetDragData);
mTargetDragData = convertedText;
mTargetDragDataLen = ucs2string.Length() * 2;
dataFound = true;
} // if plain text data on clipboard
} else {
MOZ_LOG(sDragLm, LogLevel::Debug,
("we were looking for text/unicode... \
trying again with text/plain\n"));
gdkFlavor = gdk_atom_intern(kTextMime, FALSE);
GetTargetDragData(gdkFlavor);
if (mTargetDragData) {
MOZ_LOG(sDragLm, LogLevel::Debug, ("Got textplain data\n"));
const char* castedText =
reinterpret_cast<char*>(mTargetDragData);
char16_t* convertedText = nullptr;
uint32_t convertedTextLen = 0;
UTF8ToNewUTF16(castedText, mTargetDragDataLen,
&convertedText, &convertedTextLen);
if ( convertedText ) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("successfully converted plain text \
to unicode.\n"));
// out with the old, in with the new
g_free(mTargetDragData);
mTargetDragData = convertedText;
mTargetDragDataLen = convertedTextLen * 2;
dataFound = true;
} // if plain text data on clipboard
} // if plain text flavor present
} // if plain text charset=utf-8 flavor present
} // if looking for text/unicode
// if we are looking for text/x-moz-url and we failed to find
// it on the clipboard, try again with text/uri-list, and then
// _NETSCAPE_URL
if (flavorStr.EqualsLiteral(kURLMime)) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("we were looking for text/x-moz-url...\
trying again with text/uri-list\n"));
gdkFlavor = gdk_atom_intern(gTextUriListType, FALSE);
GetTargetDragData(gdkFlavor);
if (mTargetDragData) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("Got text/uri-list data\n"));
const char *data =
reinterpret_cast<char*>(mTargetDragData);
char16_t* convertedText = nullptr;
uint32_t convertedTextLen = 0;
GetTextUriListItem(data, mTargetDragDataLen, aItemIndex,
&convertedText, &convertedTextLen);
if ( convertedText ) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("successfully converted \
_NETSCAPE_URL to unicode.\n"));
// out with the old, in with the new
g_free(mTargetDragData);
mTargetDragData = convertedText;
mTargetDragDataLen = convertedTextLen * 2;
dataFound = true;
}
}
else {
MOZ_LOG(sDragLm, LogLevel::Debug,
("failed to get text/uri-list data\n"));
}
if (!dataFound) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("we were looking for text/x-moz-url...\
trying again with _NETSCAP_URL\n"));
gdkFlavor = gdk_atom_intern(gMozUrlType, FALSE);
GetTargetDragData(gdkFlavor);
if (mTargetDragData) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("Got _NETSCAPE_URL data\n"));
const char* castedText =
reinterpret_cast<char*>(mTargetDragData);
char16_t* convertedText = nullptr;
uint32_t convertedTextLen = 0;
UTF8ToNewUTF16(castedText, mTargetDragDataLen, &convertedText, &convertedTextLen);
if ( convertedText ) {
MOZ_LOG(sDragLm,
LogLevel::Debug,
("successfully converted _NETSCAPE_URL \
to unicode.\n"));
// out with the old, in with the new
g_free(mTargetDragData);
mTargetDragData = convertedText;
mTargetDragDataLen = convertedTextLen * 2;
dataFound = true;
}
}
else {
MOZ_LOG(sDragLm, LogLevel::Debug,
("failed to get _NETSCAPE_URL data\n"));
}
}
}
} // else we try one last ditch effort to find our data
if (dataFound) {
if (!flavorStr.EqualsLiteral(kCustomTypesMime)) {
// the DOM only wants LF, so convert from MacOS line endings
// to DOM line endings.
nsLinebreakHelpers::ConvertPlatformToDOMLinebreaks(
flavorStr,
&mTargetDragData,
reinterpret_cast<int*>(&mTargetDragDataLen));
}
// put it into the transferable.
nsCOMPtr<nsISupports> genericDataWrapper;
nsPrimitiveHelpers::CreatePrimitiveForData(flavorStr,
mTargetDragData, mTargetDragDataLen,
getter_AddRefs(genericDataWrapper));
aTransferable->SetTransferData(flavorStr.get(),
genericDataWrapper,
mTargetDragDataLen);
// we found one, get out of this loop!
MOZ_LOG(sDragLm, LogLevel::Debug, ("dataFound and converted!\n"));
break;
}
} // if (currentFlavor)
} // foreach flavor
return NS_OK;
}
NS_IMETHODIMP
nsDragService::IsDataFlavorSupported(const char *aDataFlavor,
bool *_retval)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::IsDataFlavorSupported %s",
aDataFlavor));
if (!_retval)
return NS_ERROR_INVALID_ARG;
// set this to no by default
*_retval = false;
// check to make sure that we have a drag object set, here
if (!mTargetWidget) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("*** warning: IsDataFlavorSupported \
called without a valid target widget!\n"));
return NS_OK;
}
// check to see if the target context is a list.
bool isList = IsTargetContextList();
// if it is, just look in the internal data since we are the source
// for it.
if (isList) {
MOZ_LOG(sDragLm, LogLevel::Debug, ("It's a list.."));
uint32_t numDragItems = 0;
// if we don't have mDataItems we didn't start this drag so it's
// an external client trying to fool us.
if (!mSourceDataItems)
return NS_OK;
mSourceDataItems->GetLength(&numDragItems);
for (uint32_t itemIndex = 0; itemIndex < numDragItems; ++itemIndex) {
nsCOMPtr<nsITransferable> currItem =
do_QueryElementAt(mSourceDataItems, itemIndex);
if (currItem) {
nsCOMPtr <nsIArray> flavorList;
currItem->FlavorsTransferableCanExport(
getter_AddRefs(flavorList));
if (flavorList) {
uint32_t numFlavors;
flavorList->GetLength( &numFlavors );
for ( uint32_t flavorIndex = 0;
flavorIndex < numFlavors ;
++flavorIndex ) {
nsCOMPtr<nsISupportsCString> currentFlavor;
currentFlavor = do_QueryElementAt(flavorList, flavorIndex);
if (currentFlavor) {
nsCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
MOZ_LOG(sDragLm, LogLevel::Debug,
("checking %s against %s\n",
flavorStr.get(), aDataFlavor));
if (flavorStr.Equals(aDataFlavor)) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("boioioioiooioioioing!\n"));
*_retval = true;
}
}
}
}
}
}
return NS_OK;
}
// check the target context vs. this flavor, one at a time
GList *tmp;
for (tmp = gdk_drag_context_list_targets(mTargetDragContext);
tmp; tmp = tmp->next) {
/* Bug 331198 */
GdkAtom atom = GDK_POINTER_TO_ATOM(tmp->data);
gchar *name = nullptr;
name = gdk_atom_name(atom);
MOZ_LOG(sDragLm, LogLevel::Debug,
("checking %s against %s\n", name, aDataFlavor));
if (name && (strcmp(name, aDataFlavor) == 0)) {
MOZ_LOG(sDragLm, LogLevel::Debug, ("good!\n"));
*_retval = true;
}
// check for automatic text/uri-list -> text/x-moz-url mapping
if (!*_retval &&
name &&
(strcmp(name, gTextUriListType) == 0) &&
(strcmp(aDataFlavor, kURLMime) == 0 ||
strcmp(aDataFlavor, kFileMime) == 0)) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("good! ( it's text/uri-list and \
we're checking against text/x-moz-url )\n"));
*_retval = true;
}
// check for automatic _NETSCAPE_URL -> text/x-moz-url mapping
if (!*_retval &&
name &&
(strcmp(name, gMozUrlType) == 0) &&
(strcmp(aDataFlavor, kURLMime) == 0)) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("good! ( it's _NETSCAPE_URL and \
we're checking against text/x-moz-url )\n"));
*_retval = true;
}
// check for auto text/plain -> text/unicode mapping
if (!*_retval &&
name &&
(strcmp(name, kTextMime) == 0) &&
((strcmp(aDataFlavor, kUnicodeMime) == 0) ||
(strcmp(aDataFlavor, kFileMime) == 0))) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("good! ( it's text plain and we're checking \
against text/unicode or application/x-moz-file)\n"));
*_retval = true;
}
g_free(name);
}
return NS_OK;
}
void
nsDragService::ReplyToDragMotion(GdkDragContext* aDragContext)
{
MOZ_LOG(sDragLm, LogLevel::Debug,
("nsDragService::ReplyToDragMotion %d", mCanDrop));
GdkDragAction action = (GdkDragAction)0;
if (mCanDrop) {
// notify the dragger if we can drop
switch (mDragAction) {
case DRAGDROP_ACTION_COPY:
action = GDK_ACTION_COPY;
break;
case DRAGDROP_ACTION_LINK:
action = GDK_ACTION_LINK;
break;
case DRAGDROP_ACTION_NONE:
action = (GdkDragAction)0;
break;
default:
action = GDK_ACTION_MOVE;
break;
}
}
gdk_drag_status(aDragContext, action, mTargetTime);
}
void
nsDragService::TargetDataReceived(GtkWidget *aWidget,
GdkDragContext *aContext,
gint aX,
gint aY,
GtkSelectionData *aSelectionData,
guint aInfo,
guint32 aTime)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::TargetDataReceived"));
TargetResetData();
mTargetDragDataReceived = true;
gint len = gtk_selection_data_get_length(aSelectionData);
const guchar* data = gtk_selection_data_get_data(aSelectionData);
if (len > 0 && data) {
mTargetDragDataLen = len;
mTargetDragData = g_malloc(mTargetDragDataLen);
memcpy(mTargetDragData, data, mTargetDragDataLen);
}
else {
MOZ_LOG(sDragLm, LogLevel::Debug,
("Failed to get data. selection data len was %d\n",
mTargetDragDataLen));
}
}
bool
nsDragService::IsTargetContextList(void)
{
bool retval = false;
// gMimeListType drags only work for drags within a single process. The
// gtk_drag_get_source_widget() function will return nullptr if the source
// of the drag is another app, so we use it to check if a gMimeListType
// drop will work or not.
if (gtk_drag_get_source_widget(mTargetDragContext) == nullptr)
return retval;
GList *tmp;
// walk the list of context targets and see if one of them is a list
// of items.
for (tmp = gdk_drag_context_list_targets(mTargetDragContext);
tmp; tmp = tmp->next) {
/* Bug 331198 */
GdkAtom atom = GDK_POINTER_TO_ATOM(tmp->data);
gchar *name = nullptr;
name = gdk_atom_name(atom);
if (name && strcmp(name, gMimeListType) == 0)
retval = true;
g_free(name);
if (retval)
break;
}
return retval;
}
// Maximum time to wait for a "drag_received" arrived, in microseconds
#define NS_DND_TIMEOUT 500000
void
nsDragService::GetTargetDragData(GdkAtom aFlavor)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("getting data flavor %p\n", aFlavor));
MOZ_LOG(sDragLm, LogLevel::Debug, ("mLastWidget is %p and mLastContext is %p\n",
mTargetWidget.get(),
mTargetDragContext.get()));
// reset our target data areas
TargetResetData();
gtk_drag_get_data(mTargetWidget, mTargetDragContext, aFlavor, mTargetTime);
MOZ_LOG(sDragLm, LogLevel::Debug, ("about to start inner iteration."));
PRTime entryTime = PR_Now();
while (!mTargetDragDataReceived && mDoingDrag) {
// check the number of iterations
MOZ_LOG(sDragLm, LogLevel::Debug, ("doing iteration...\n"));
PR_Sleep(20*PR_TicksPerSecond()/1000); /* sleep for 20 ms/iteration */
if (PR_Now()-entryTime > NS_DND_TIMEOUT) break;
gtk_main_iteration();
}
MOZ_LOG(sDragLm, LogLevel::Debug, ("finished inner iteration\n"));
}
void
nsDragService::TargetResetData(void)
{
mTargetDragDataReceived = false;
// make sure to free old data if we have to
g_free(mTargetDragData);
mTargetDragData = 0;
mTargetDragDataLen = 0;
}
GtkTargetList *
nsDragService::GetSourceList(void)
{
if (!mSourceDataItems)
return nullptr;
nsTArray<GtkTargetEntry*> targetArray;
GtkTargetEntry *targets;
GtkTargetList *targetList = 0;
uint32_t targetCount = 0;
unsigned int numDragItems = 0;
mSourceDataItems->GetLength(&numDragItems);
// Check to see if we're dragging > 1 item.
if (numDragItems > 1) {
// as the Xdnd protocol only supports a single item (or is it just
// gtk's implementation?), we don't advertise all flavours listed
// in the nsITransferable.
// the application/x-moz-internal-item-list format, which preserves
// all information for drags within the same mozilla instance.
GtkTargetEntry *listTarget =
(GtkTargetEntry *)g_malloc(sizeof(GtkTargetEntry));
listTarget->target = g_strdup(gMimeListType);
listTarget->flags = 0;
MOZ_LOG(sDragLm, LogLevel::Debug,
("automatically adding target %s\n", listTarget->target));
targetArray.AppendElement(listTarget);
// check what flavours are supported so we can decide what other
// targets to advertise.
nsCOMPtr<nsITransferable> currItem =
do_QueryElementAt(mSourceDataItems, 0);
if (currItem) {
nsCOMPtr <nsIArray> flavorList;
currItem->FlavorsTransferableCanExport(getter_AddRefs(flavorList));
if (flavorList) {
uint32_t numFlavors;
flavorList->GetLength( &numFlavors );
for (uint32_t flavorIndex = 0;
flavorIndex < numFlavors ;
++flavorIndex ) {
nsCOMPtr<nsISupportsCString> currentFlavor;
currentFlavor = do_QueryElementAt(flavorList, flavorIndex);
if (currentFlavor) {
nsCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
// check if text/x-moz-url is supported.
// If so, advertise
// text/uri-list.
if (flavorStr.EqualsLiteral(kURLMime)) {
listTarget =
(GtkTargetEntry *)g_malloc(sizeof(GtkTargetEntry));
listTarget->target = g_strdup(gTextUriListType);
listTarget->flags = 0;
MOZ_LOG(sDragLm, LogLevel::Debug,
("automatically adding target %s\n",
listTarget->target));
targetArray.AppendElement(listTarget);
}
}
} // foreach flavor in item
} // if valid flavor list
} // if item is a transferable
} else if (numDragItems == 1) {
nsCOMPtr<nsITransferable> currItem =
do_QueryElementAt(mSourceDataItems, 0);
if (currItem) {
nsCOMPtr <nsIArray> flavorList;
currItem->FlavorsTransferableCanExport(getter_AddRefs(flavorList));
if (flavorList) {
uint32_t numFlavors;
flavorList->GetLength( &numFlavors );
for (uint32_t flavorIndex = 0;
flavorIndex < numFlavors ;
++flavorIndex ) {
nsCOMPtr<nsISupportsCString> currentFlavor;
currentFlavor = do_QueryElementAt(flavorList, flavorIndex);
if (currentFlavor) {
nsCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
GtkTargetEntry *target =
(GtkTargetEntry *)g_malloc(sizeof(GtkTargetEntry));
target->target = g_strdup(flavorStr.get());
target->flags = 0;
MOZ_LOG(sDragLm, LogLevel::Debug,
("adding target %s\n", target->target));
targetArray.AppendElement(target);
// If there is a file, add the text/uri-list type.
if (flavorStr.EqualsLiteral(kFileMime)) {
GtkTargetEntry *urilistTarget =
(GtkTargetEntry *)g_malloc(sizeof(GtkTargetEntry));
urilistTarget->target = g_strdup(gTextUriListType);
urilistTarget->flags = 0;
MOZ_LOG(sDragLm, LogLevel::Debug,
("automatically adding target %s\n",
urilistTarget->target));
targetArray.AppendElement(urilistTarget);
}
// Check to see if this is text/unicode.
// If it is, add text/plain
// since we automatically support text/plain
// if we support text/unicode.
else if (flavorStr.EqualsLiteral(kUnicodeMime)) {
GtkTargetEntry *plainUTF8Target =
(GtkTargetEntry *)g_malloc(sizeof(GtkTargetEntry));
plainUTF8Target->target = g_strdup(gTextPlainUTF8Type);
plainUTF8Target->flags = 0;
MOZ_LOG(sDragLm, LogLevel::Debug,
("automatically adding target %s\n",
plainUTF8Target->target));
targetArray.AppendElement(plainUTF8Target);
GtkTargetEntry *plainTarget =
(GtkTargetEntry *)g_malloc(sizeof(GtkTargetEntry));
plainTarget->target = g_strdup(kTextMime);
plainTarget->flags = 0;
MOZ_LOG(sDragLm, LogLevel::Debug,
("automatically adding target %s\n",
plainTarget->target));
targetArray.AppendElement(plainTarget);
}
// Check to see if this is the x-moz-url type.
// If it is, add _NETSCAPE_URL
// this is a type used by everybody.
else if (flavorStr.EqualsLiteral(kURLMime)) {
GtkTargetEntry *urlTarget =
(GtkTargetEntry *)g_malloc(sizeof(GtkTargetEntry));
urlTarget->target = g_strdup(gMozUrlType);
urlTarget->flags = 0;
MOZ_LOG(sDragLm, LogLevel::Debug,
("automatically adding target %s\n",
urlTarget->target));
targetArray.AppendElement(urlTarget);
}
}
} // foreach flavor in item
} // if valid flavor list
} // if item is a transferable
} // if it is a single item drag
// get all the elements that we created.
targetCount = targetArray.Length();
if (targetCount) {
// allocate space to create the list of valid targets
targets =
(GtkTargetEntry *)g_malloc(sizeof(GtkTargetEntry) * targetCount);
uint32_t targetIndex;
for ( targetIndex = 0; targetIndex < targetCount; ++targetIndex) {
GtkTargetEntry *disEntry = targetArray.ElementAt(targetIndex);
// this is a string reference but it will be freed later.
targets[targetIndex].target = disEntry->target;
targets[targetIndex].flags = disEntry->flags;
targets[targetIndex].info = 0;
}
targetList = gtk_target_list_new(targets, targetCount);
// clean up the target list
for (uint32_t cleanIndex = 0; cleanIndex < targetCount; ++cleanIndex) {
GtkTargetEntry *thisTarget = targetArray.ElementAt(cleanIndex);
g_free(thisTarget->target);
g_free(thisTarget);
}
g_free(targets);
}
return targetList;
}
void
nsDragService::SourceEndDragSession(GdkDragContext *aContext,
gint aResult)
{
// this just releases the list of data items that we provide
mSourceDataItems = nullptr;
if (!mDoingDrag || mScheduledTask == eDragTaskSourceEnd)
// EndDragSession() was already called on drop
// or SourceEndDragSession on drag-failed
return;
if (mEndDragPoint.x < 0) {
// We don't have a drag end point, so guess
gint x, y;
GdkDisplay* display = gdk_display_get_default();
if (display) {
gint scale = ScreenHelperGTK::GetGTKMonitorScaleFactor();
gdk_display_get_pointer(display, nullptr, &x, &y, nullptr);
SetDragEndPoint(LayoutDeviceIntPoint(x * scale, y * scale));
}
}
// Either the drag was aborted or the drop occurred outside the app.
// The dropEffect of mDataTransfer is not updated for motion outside the
// app, but is needed for the dragend event, so set it now.
uint32_t dropEffect;
if (aResult == MOZ_GTK_DRAG_RESULT_SUCCESS) {
// With GTK+ versions 2.10.x and prior the drag may have been
// cancelled (but no drag-failed signal would have been sent).
// aContext->dest_window will be non-nullptr only if the drop was
// sent.
GdkDragAction action =
gdk_drag_context_get_dest_window(aContext) ?
gdk_drag_context_get_actions(aContext) : (GdkDragAction)0;
// Only one bit of action should be set, but, just in case someone
// does something funny, erring away from MOVE, and not recording
// unusual action combinations as NONE.
if (!action)
dropEffect = DRAGDROP_ACTION_NONE;
else if (action & GDK_ACTION_COPY)
dropEffect = DRAGDROP_ACTION_COPY;
else if (action & GDK_ACTION_LINK)
dropEffect = DRAGDROP_ACTION_LINK;
else if (action & GDK_ACTION_MOVE)
dropEffect = DRAGDROP_ACTION_MOVE;
else
dropEffect = DRAGDROP_ACTION_COPY;
} else {
dropEffect = DRAGDROP_ACTION_NONE;
if (aResult != MOZ_GTK_DRAG_RESULT_NO_TARGET) {
mUserCancelled = true;
}
}
if (mDataTransfer) {
mDataTransfer->SetDropEffectInt(dropEffect);
}
// Schedule the appropriate drag end dom events.
Schedule(eDragTaskSourceEnd, nullptr, nullptr, LayoutDeviceIntPoint(), 0);
}
static void
CreateUriList(nsIArray *items, gchar **text, gint *length)
{
uint32_t i, count;
GString *uriList = g_string_new(nullptr);
items->GetLength(&count);
for (i = 0; i < count; i++) {
nsCOMPtr<nsITransferable> item;
item = do_QueryElementAt(items, i);
if (item) {
uint32_t tmpDataLen = 0;
void *tmpData = nullptr;
nsresult rv = NS_OK;
nsCOMPtr<nsISupports> data;
rv = item->GetTransferData(kURLMime,
getter_AddRefs(data),
&tmpDataLen);
if (NS_SUCCEEDED(rv)) {
nsPrimitiveHelpers::CreateDataFromPrimitive(
nsDependentCString(kURLMime), data, &tmpData, tmpDataLen);
char* plainTextData = nullptr;
char16_t* castedUnicode = reinterpret_cast<char16_t*>
(tmpData);
uint32_t plainTextLen = 0;
UTF16ToNewUTF8(castedUnicode,
tmpDataLen / 2,
&plainTextData,
&plainTextLen);
if (plainTextData) {
uint32_t j;
// text/x-moz-url is of form url + "\n" + title.
// We just want the url.
for (j = 0; j < plainTextLen; j++)
if (plainTextData[j] == '\n' ||
plainTextData[j] == '\r') {
plainTextData[j] = '\0';
break;
}
g_string_append(uriList, plainTextData);
g_string_append(uriList, "\r\n");
// this wasn't allocated with glib
free(plainTextData);
}
if (tmpData) {
// this wasn't allocated with glib
free(tmpData);
}
} else {
// There is no uri available. If there is a file available,
// create a uri from the file.
nsCOMPtr<nsISupports> data;
rv = item->GetTransferData(kFileMime,
getter_AddRefs(data),
&tmpDataLen);
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIFile> file = do_QueryInterface(data);
if (!file) {
// Sometimes the file is wrapped in a
// nsISupportsInterfacePointer. See bug 1310193 for
// removing this distinction.
nsCOMPtr<nsISupportsInterfacePointer> ptr =
do_QueryInterface(data);
if (ptr) {
ptr->GetData(getter_AddRefs(data));
file = do_QueryInterface(data);
}
}
if (file) {
nsCOMPtr<nsIURI> fileURI;
NS_NewFileURI(getter_AddRefs(fileURI), file);
if (fileURI) {
nsAutoCString uristring;
fileURI->GetSpec(uristring);
g_string_append(uriList, uristring.get());
g_string_append(uriList, "\r\n");
}
}
}
}
}
}
*text = uriList->str;
*length = uriList->len + 1;
g_string_free(uriList, FALSE); // don't free the data
}
void
nsDragService::SourceDataGet(GtkWidget *aWidget,
GdkDragContext *aContext,
GtkSelectionData *aSelectionData,
guint32 aTime)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("nsDragService::SourceDataGet"));
GdkAtom target = gtk_selection_data_get_target(aSelectionData);
nsCString mimeFlavor;
gchar *typeName = 0;
typeName = gdk_atom_name(target);
if (!typeName) {
MOZ_LOG(sDragLm, LogLevel::Debug, ("failed to get atom name.\n"));
return;
}
MOZ_LOG(sDragLm, LogLevel::Debug, ("Type is %s\n", typeName));
// make a copy since |nsCString| won't use |g_free|...
mimeFlavor.Adopt(strdup(typeName));
g_free(typeName);
// check to make sure that we have data items to return.
if (!mSourceDataItems) {
MOZ_LOG(sDragLm, LogLevel::Debug, ("Failed to get our data items\n"));
return;
}
nsCOMPtr<nsITransferable> item;
item = do_QueryElementAt(mSourceDataItems, 0);
if (item) {
// if someone was asking for text/plain, lookup unicode instead so
// we can convert it.
bool needToDoConversionToPlainText = false;
const char* actualFlavor;
if (mimeFlavor.EqualsLiteral(kTextMime) ||
mimeFlavor.EqualsLiteral(gTextPlainUTF8Type)) {
actualFlavor = kUnicodeMime;
needToDoConversionToPlainText = true;
}
// if someone was asking for _NETSCAPE_URL we need to convert to
// plain text but we also need to look for x-moz-url
else if (mimeFlavor.EqualsLiteral(gMozUrlType)) {
actualFlavor = kURLMime;
needToDoConversionToPlainText = true;
}
// if someone was asking for text/uri-list we need to convert to
// plain text.
else if (mimeFlavor.EqualsLiteral(gTextUriListType)) {
actualFlavor = gTextUriListType;
needToDoConversionToPlainText = true;
}
else
actualFlavor = mimeFlavor.get();
uint32_t tmpDataLen = 0;
void *tmpData = nullptr;
nsresult rv;
nsCOMPtr<nsISupports> data;
rv = item->GetTransferData(actualFlavor,
getter_AddRefs(data),
&tmpDataLen);
if (NS_SUCCEEDED(rv)) {
nsPrimitiveHelpers::CreateDataFromPrimitive(
nsDependentCString(actualFlavor), data, &tmpData, tmpDataLen);
// if required, do the extra work to convert unicode to plain
// text and replace the output values with the plain text.
if (needToDoConversionToPlainText) {
char* plainTextData = nullptr;
char16_t* castedUnicode = reinterpret_cast<char16_t*>
(tmpData);
uint32_t plainTextLen = 0;
UTF16ToNewUTF8(castedUnicode,
tmpDataLen / 2,
&plainTextData,
&plainTextLen);
if (tmpData) {
// this was not allocated using glib
free(tmpData);
tmpData = plainTextData;
tmpDataLen = plainTextLen;
}
}
if (tmpData) {
// this copies the data
gtk_selection_data_set(aSelectionData, target,
8,
(guchar *)tmpData, tmpDataLen);
// this wasn't allocated with glib
free(tmpData);
}
} else {
if (mimeFlavor.EqualsLiteral(gTextUriListType)) {
// fall back for text/uri-list
gchar *uriList;
gint length;
CreateUriList(mSourceDataItems, &uriList, &length);
gtk_selection_data_set(aSelectionData, target,
8, (guchar *)uriList, length);
g_free(uriList);
return;
}
}
}
}
void nsDragService::SetDragIcon(GdkDragContext* aContext)
{
if (!mHasImage && !mSelection)
return;
LayoutDeviceIntRect dragRect;
nsPresContext* pc;
RefPtr<SourceSurface> surface;
DrawDrag(mSourceNode, mSourceRegion, mScreenPosition,
&dragRect, &surface, &pc);
if (!pc)
return;
LayoutDeviceIntPoint screenPoint =
ConvertToUnscaledDevPixels(pc, mScreenPosition);
int32_t offsetX = screenPoint.x - dragRect.x;
int32_t offsetY = screenPoint.y - dragRect.y;
// If a popup is set as the drag image, use its widget. Otherwise, use
// the surface that DrawDrag created.
//
// XXX: Disable drag popups on GTK 3.19.4 and above: see bug 1264454.
// Fix this once a new GTK version ships that does not destroy our
// widget in gtk_drag_set_icon_widget.
if (mDragPopup && gtk_check_version(3, 19, 4)) {
GtkWidget* gtkWidget = nullptr;
nsIFrame* frame = mDragPopup->GetPrimaryFrame();
if (frame) {
// DrawDrag ensured that this is a popup frame.
nsCOMPtr<nsIWidget> widget = frame->GetNearestWidget();
if (widget) {
gtkWidget = (GtkWidget *)widget->GetNativeData(NS_NATIVE_SHELLWIDGET);
if (gtkWidget) {
OpenDragPopup();
gtk_drag_set_icon_widget(aContext, gtkWidget, offsetX, offsetY);
}
}
}
}
else if (surface) {
if (!SetAlphaPixmap(surface, aContext, offsetX, offsetY, dragRect)) {
GdkPixbuf* dragPixbuf =
nsImageToPixbuf::SourceSurfaceToPixbuf(surface, dragRect.width, dragRect.height);
if (dragPixbuf) {
gtk_drag_set_icon_pixbuf(aContext, dragPixbuf, offsetX, offsetY);
g_object_unref(dragPixbuf);
}
}
}
}
static void
invisibleSourceDragBegin(GtkWidget *aWidget,
GdkDragContext *aContext,
gpointer aData)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("invisibleSourceDragBegin"));
nsDragService *dragService = (nsDragService *)aData;
dragService->SetDragIcon(aContext);
}
static void
invisibleSourceDragDataGet(GtkWidget *aWidget,
GdkDragContext *aContext,
GtkSelectionData *aSelectionData,
guint aInfo,
guint32 aTime,
gpointer aData)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("invisibleSourceDragDataGet"));
nsDragService *dragService = (nsDragService *)aData;
dragService->SourceDataGet(aWidget, aContext,
aSelectionData, aTime);
}
static gboolean
invisibleSourceDragFailed(GtkWidget *aWidget,
GdkDragContext *aContext,
gint aResult,
gpointer aData)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("invisibleSourceDragFailed %i", aResult));
nsDragService *dragService = (nsDragService *)aData;
// End the drag session now (rather than waiting for the drag-end signal)
// so that operations performed on dropEffect == none can start immediately
// rather than waiting for the drag-failed animation to finish.
dragService->SourceEndDragSession(aContext, aResult);
// We should return TRUE to disable the drag-failed animation iff the
// source performed an operation when dropEffect was none, but the handler
// of the dragend DOM event doesn't provide this information.
return FALSE;
}
static void
invisibleSourceDragEnd(GtkWidget *aWidget,
GdkDragContext *aContext,
gpointer aData)
{
MOZ_LOG(sDragLm, LogLevel::Debug, ("invisibleSourceDragEnd"));
nsDragService *dragService = (nsDragService *)aData;
// The drag has ended. Release the hostages!
dragService->SourceEndDragSession(aContext, MOZ_GTK_DRAG_RESULT_SUCCESS);
}
// The following methods handle responding to GTK drag signals and
// tracking state between these signals.
//
// In general, GTK does not expect us to run the event loop while handling its
// drag signals, however our drag event handlers may run the
// event loop, most often to fetch information about the drag data.
//
// GTK, for example, uses the return value from drag-motion signals to
// determine whether drag-leave signals should be sent. If an event loop is
// run during drag-motion the XdndLeave message can get processed but when GTK
// receives the message it does not yet know that it needs to send the
// drag-leave signal to our widget.
//
// After a drag-drop signal, we need to reply with gtk_drag_finish().
// However, gtk_drag_finish should happen after the drag-drop signal handler
// returns so that when the Motif drag protocol is used, the
// XmTRANSFER_SUCCESS during gtk_drag_finish is sent after the XmDROP_START
// reply sent on return from the drag-drop signal handler.
//
// Similarly drag-end for a successful drag and drag-failed are not good
// times to run a nested event loop as gtk_drag_drop_finished() and
// gtk_drag_source_info_destroy() don't gtk_drag_clear_source_info() or remove
// drop_timeout until after at least the first of these signals is sent.
// Processing other events (e.g. a slow GDK_DROP_FINISHED reply, or the drop
// timeout) could cause gtk_drag_drop_finished to be called again with the
// same GtkDragSourceInfo, which won't like being destroyed twice.
//
// Therefore we reply to the signals immediately and schedule a task to
// dispatch the Gecko events, which may run the event loop.
//
// Action in response to drag-leave signals is also delayed until the event
// loop runs again so that we find out whether a drag-drop signal follows.
//
// A single task is scheduled to manage responses to all three GTK signals.
// If further signals are received while the task is scheduled, the scheduled
// response is updated, sometimes effectively compressing successive signals.
//
// No Gecko drag events are dispatched (during nested event loops) while other
// Gecko drag events are in flight. This helps event handlers that may not
// expect nested events, while accessing an event's dataTransfer for example.
gboolean
nsDragService::ScheduleMotionEvent(nsWindow *aWindow,
GdkDragContext *aDragContext,
LayoutDeviceIntPoint aWindowPoint, guint aTime)
{
if (mScheduledTask == eDragTaskMotion) {
// The drag source has sent another motion message before we've
// replied to the previous. That shouldn't happen with Xdnd. The
// spec for Motif drags is less clear, but we'll just update the
// scheduled task with the new position reply only to the most
// recent message.
NS_WARNING("Drag Motion message received before previous reply was sent");
}
// Returning TRUE means we'll reply with a status message, unless we first
// get a leave.
return Schedule(eDragTaskMotion, aWindow, aDragContext,
aWindowPoint, aTime);
}
void
nsDragService::ScheduleLeaveEvent()
{
// We don't know at this stage whether a drop signal will immediately
// follow. If the drop signal gets sent it will happen before we return
// to the main loop and the scheduled leave task will be replaced.
if (!Schedule(eDragTaskLeave, nullptr, nullptr, LayoutDeviceIntPoint(), 0)) {
NS_WARNING("Drag leave after drop");
}
}
gboolean
nsDragService::ScheduleDropEvent(nsWindow *aWindow,
GdkDragContext *aDragContext,
LayoutDeviceIntPoint aWindowPoint, guint aTime)
{
if (!Schedule(eDragTaskDrop, aWindow,
aDragContext, aWindowPoint, aTime)) {
NS_WARNING("Additional drag drop ignored");
return FALSE;
}
SetDragEndPoint(aWindowPoint + aWindow->WidgetToScreenOffset());
// We'll reply with gtk_drag_finish().
return TRUE;
}
gboolean
nsDragService::Schedule(DragTask aTask, nsWindow *aWindow,
GdkDragContext *aDragContext,
LayoutDeviceIntPoint aWindowPoint, guint aTime)
{
// If there is an existing leave or motion task scheduled, then that
// will be replaced. When the new task is run, it will dispatch
// any necessary leave or motion events.
// If aTask is eDragTaskSourceEnd, then it will replace even a scheduled
// drop event (which could happen if the drop event has not been processed
// within the allowed time). Otherwise, if we haven't yet run a scheduled
// drop or end task, just say that we are not ready to receive another
// drop.
if (mScheduledTask == eDragTaskSourceEnd ||
(mScheduledTask == eDragTaskDrop && aTask != eDragTaskSourceEnd))
return FALSE;
mScheduledTask = aTask;
mPendingWindow = aWindow;
mPendingDragContext = aDragContext;
mPendingWindowPoint = aWindowPoint;
mPendingTime = aTime;
if (!mTaskSource) {
// High priority is used here because the native events involved have
// already waited at default priority. Perhaps a lower than default
// priority could be used for motion tasks because there is a chance
// that a leave or drop is waiting, but managing different priorities
// may not be worth the effort. Motion tasks shouldn't queue up as
// they should be throttled based on replies.
mTaskSource = g_idle_add_full(G_PRIORITY_HIGH, TaskDispatchCallback,
this, nullptr);
}
return TRUE;
}
gboolean
nsDragService::TaskDispatchCallback(gpointer data)
{
RefPtr<nsDragService> dragService = static_cast<nsDragService*>(data);
return dragService->RunScheduledTask();
}
gboolean
nsDragService::RunScheduledTask()
{
if (mTargetWindow && mTargetWindow != mPendingWindow) {
MOZ_LOG(sDragLm, LogLevel::Debug,
("nsDragService: dispatch drag leave (%p)\n",
mTargetWindow.get()));
mTargetWindow->DispatchDragEvent(eDragExit, mTargetWindowPoint, 0);
if (!mSourceNode) {
// The drag that was initiated in a different app. End the drag
// session, since we're done with it for now (until the user drags
// back into this app).
EndDragSession(false, GetCurrentModifiers());
}
}
// It is possible that the pending state has been updated during dispatch
// of the leave event. That's fine.
// Now we collect the pending state because, from this point on, we want
// to use the same state for all events dispatched. All state is updated
// so that when other tasks are scheduled during dispatch here, this
// task is considered to have already been run.
bool positionHasChanged =
mPendingWindow != mTargetWindow ||
mPendingWindowPoint != mTargetWindowPoint;
DragTask task = mScheduledTask;
mScheduledTask = eDragTaskNone;
mTargetWindow = mPendingWindow.forget();
mTargetWindowPoint = mPendingWindowPoint;
if (task == eDragTaskLeave || task == eDragTaskSourceEnd) {
if (task == eDragTaskSourceEnd) {
// Dispatch drag end events.
EndDragSession(true, GetCurrentModifiers());
}
// Nothing more to do
// Returning false removes the task source from the event loop.
mTaskSource = 0;
return FALSE;
}
// This may be the start of a destination drag session.
StartDragSession();
// mTargetWidget may be nullptr if the window has been destroyed.
// (The leave event is not scheduled if a drop task is still scheduled.)
// We still reply appropriately to indicate that the drop will or didn't
// succeeed.
mTargetWidget = mTargetWindow->GetMozContainerWidget();
mTargetDragContext.steal(mPendingDragContext);
mTargetTime = mPendingTime;
// http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#drag-and-drop-processing-model
// (as at 27 December 2010) indicates that a "drop" event should only be
// fired (at the current target element) if the current drag operation is
// not none. The current drag operation will only be set to a non-none
// value during a "dragover" event.
//
// If the user has ended the drag before any dragover events have been
// sent, then the spec recommends skipping the drop (because the current
// drag operation is none). However, here we assume that, by releasing
// the mouse button, the user has indicated that they want to drop, so we
// proceed with the drop where possible.
//
// In order to make the events appear to content in the same way as if the
// spec is being followed we make sure to dispatch a "dragover" event with
// appropriate coordinates and check canDrop before the "drop" event.
//
// When the Xdnd protocol is used for source/destination communication (as
// should be the case with GTK source applications) a dragover event
// should have already been sent during the drag-motion signal, which
// would have already been received because XdndDrop messages do not
// contain a position. However, we can't assume the same when the Motif
// protocol is used.
if (task == eDragTaskMotion || positionHasChanged) {
UpdateDragAction();
TakeDragEventDispatchedToChildProcess(); // Clear the old value.
DispatchMotionEvents();
if (task == eDragTaskMotion) {
if (TakeDragEventDispatchedToChildProcess()) {
mTargetDragContextForRemote = mTargetDragContext;
} else {
// Reply to tell the source whether we can drop and what
// action would be taken.
ReplyToDragMotion(mTargetDragContext);
}
}
}
if (task == eDragTaskDrop) {
gboolean success = DispatchDropEvent();
// Perhaps we should set the del parameter to TRUE when the drag
// action is move, but we don't know whether the data was successfully
// transferred.
gtk_drag_finish(mTargetDragContext, success,
/* del = */ FALSE, mTargetTime);
// This drag is over, so clear out our reference to the previous
// window.
mTargetWindow = nullptr;
// Make sure to end the drag session. If this drag started in a
// different app, we won't get a drag_end signal to end it from.
EndDragSession(true, GetCurrentModifiers());
}
// We're done with the drag context.
mTargetWidget = nullptr;
mTargetDragContext = nullptr;
// If we got another drag signal while running the sheduled task, that
// must have happened while running a nested event loop. Leave the task
// source on the event loop.
if (mScheduledTask != eDragTaskNone)
return TRUE;
// We have no task scheduled.
// Returning false removes the task source from the event loop.
mTaskSource = 0;
return FALSE;
}
// This will update the drag action based on the information in the
// drag context. Gtk gets this from a combination of the key settings
// and what the source is offering.
void
nsDragService::UpdateDragAction()
{
// This doesn't look right. dragSession.dragAction is used by
// nsContentUtils::SetDataTransferInEvent() to set the initial
// dataTransfer.dropEffect, so GdkDragContext::suggested_action would be
// more appropriate. GdkDragContext::actions should be used to set
// dataTransfer.effectAllowed, which doesn't currently happen with
// external sources.
// default is to do nothing
int action = nsIDragService::DRAGDROP_ACTION_NONE;
GdkDragAction gdkAction = gdk_drag_context_get_actions(mTargetDragContext);
// set the default just in case nothing matches below
if (gdkAction & GDK_ACTION_DEFAULT)
action = nsIDragService::DRAGDROP_ACTION_MOVE;
// first check to see if move is set
if (gdkAction & GDK_ACTION_MOVE)
action = nsIDragService::DRAGDROP_ACTION_MOVE;
// then fall to the others
else if (gdkAction & GDK_ACTION_LINK)
action = nsIDragService::DRAGDROP_ACTION_LINK;
// copy is ctrl
else if (gdkAction & GDK_ACTION_COPY)
action = nsIDragService::DRAGDROP_ACTION_COPY;
// update the drag information
SetDragAction(action);
}
NS_IMETHODIMP
nsDragService::UpdateDragEffect()
{
if (mTargetDragContextForRemote) {
ReplyToDragMotion(mTargetDragContextForRemote);
mTargetDragContextForRemote = nullptr;
}
return NS_OK;
}
void
nsDragService::DispatchMotionEvents()
{
mCanDrop = false;
FireDragEventAtSource(eDrag, GetCurrentModifiers());
mTargetWindow->DispatchDragEvent(eDragOver, mTargetWindowPoint,
mTargetTime);
}
// Returns true if the drop was successful
gboolean
nsDragService::DispatchDropEvent()
{
// We need to check IsDestroyed here because the nsRefPtr
// only protects this from being deleted, it does NOT protect
// against nsView::~nsView() calling Destroy() on it, bug 378273.
if (mTargetWindow->IsDestroyed())
return FALSE;
EventMessage msg = mCanDrop ? eDrop : eDragExit;
mTargetWindow->DispatchDragEvent(msg, mTargetWindowPoint, mTargetTime);
return mCanDrop;
}
/* static */ uint32_t
nsDragService::GetCurrentModifiers()
{
return mozilla::widget::KeymapWrapper::ComputeCurrentKeyModifiers();
}
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