1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/xpwidgets/nsBaseDragService.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,669 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "nsBaseDragService.h"
1.10 +#include "nsITransferable.h"
1.11 +
1.12 +#include "nsIServiceManager.h"
1.13 +#include "nsITransferable.h"
1.14 +#include "nsISupportsArray.h"
1.15 +#include "nsSize.h"
1.16 +#include "nsXPCOM.h"
1.17 +#include "nsISupportsPrimitives.h"
1.18 +#include "nsCOMPtr.h"
1.19 +#include "nsIInterfaceRequestorUtils.h"
1.20 +#include "nsIFrame.h"
1.21 +#include "nsIDocument.h"
1.22 +#include "nsIContent.h"
1.23 +#include "nsIPresShell.h"
1.24 +#include "nsViewManager.h"
1.25 +#include "nsIDOMNode.h"
1.26 +#include "nsIDOMDragEvent.h"
1.27 +#include "nsISelection.h"
1.28 +#include "nsISelectionPrivate.h"
1.29 +#include "nsPresContext.h"
1.30 +#include "nsIDOMDataTransfer.h"
1.31 +#include "nsIImageLoadingContent.h"
1.32 +#include "imgIContainer.h"
1.33 +#include "imgIRequest.h"
1.34 +#include "nsRegion.h"
1.35 +#include "nsXULPopupManager.h"
1.36 +#include "nsMenuPopupFrame.h"
1.37 +#include "mozilla/MouseEvents.h"
1.38 +#include "mozilla/Preferences.h"
1.39 +#include "mozilla/gfx/2D.h"
1.40 +
1.41 +#include "gfxContext.h"
1.42 +#include "gfxPlatform.h"
1.43 +#include <algorithm>
1.44 +
1.45 +using namespace mozilla;
1.46 +using namespace mozilla::gfx;
1.47 +using namespace mozilla::dom;
1.48 +
1.49 +#define DRAGIMAGES_PREF "nglayout.enable_drag_images"
1.50 +
1.51 +nsBaseDragService::nsBaseDragService()
1.52 + : mCanDrop(false), mOnlyChromeDrop(false), mDoingDrag(false),
1.53 + mHasImage(false), mUserCancelled(false),
1.54 + mDragAction(DRAGDROP_ACTION_NONE), mTargetSize(0,0),
1.55 + mImageX(0), mImageY(0), mScreenX(-1), mScreenY(-1), mSuppressLevel(0),
1.56 + mInputSource(nsIDOMMouseEvent::MOZ_SOURCE_MOUSE)
1.57 +{
1.58 +}
1.59 +
1.60 +nsBaseDragService::~nsBaseDragService()
1.61 +{
1.62 +}
1.63 +
1.64 +NS_IMPL_ISUPPORTS(nsBaseDragService, nsIDragService, nsIDragSession)
1.65 +
1.66 +//---------------------------------------------------------
1.67 +NS_IMETHODIMP
1.68 +nsBaseDragService::SetCanDrop(bool aCanDrop)
1.69 +{
1.70 + mCanDrop = aCanDrop;
1.71 + return NS_OK;
1.72 +}
1.73 +
1.74 +//---------------------------------------------------------
1.75 +NS_IMETHODIMP
1.76 +nsBaseDragService::GetCanDrop(bool * aCanDrop)
1.77 +{
1.78 + *aCanDrop = mCanDrop;
1.79 + return NS_OK;
1.80 +}
1.81 +//---------------------------------------------------------
1.82 +NS_IMETHODIMP
1.83 +nsBaseDragService::SetOnlyChromeDrop(bool aOnlyChrome)
1.84 +{
1.85 + mOnlyChromeDrop = aOnlyChrome;
1.86 + return NS_OK;
1.87 +}
1.88 +
1.89 +//---------------------------------------------------------
1.90 +NS_IMETHODIMP
1.91 +nsBaseDragService::GetOnlyChromeDrop(bool* aOnlyChrome)
1.92 +{
1.93 + *aOnlyChrome = mOnlyChromeDrop;
1.94 + return NS_OK;
1.95 +}
1.96 +
1.97 +//---------------------------------------------------------
1.98 +NS_IMETHODIMP
1.99 +nsBaseDragService::SetDragAction(uint32_t anAction)
1.100 +{
1.101 + mDragAction = anAction;
1.102 + return NS_OK;
1.103 +}
1.104 +
1.105 +//---------------------------------------------------------
1.106 +NS_IMETHODIMP
1.107 +nsBaseDragService::GetDragAction(uint32_t * anAction)
1.108 +{
1.109 + *anAction = mDragAction;
1.110 + return NS_OK;
1.111 +}
1.112 +
1.113 +//---------------------------------------------------------
1.114 +NS_IMETHODIMP
1.115 +nsBaseDragService::SetTargetSize(nsSize aDragTargetSize)
1.116 +{
1.117 + mTargetSize = aDragTargetSize;
1.118 + return NS_OK;
1.119 +}
1.120 +
1.121 +//---------------------------------------------------------
1.122 +NS_IMETHODIMP
1.123 +nsBaseDragService::GetTargetSize(nsSize * aDragTargetSize)
1.124 +{
1.125 + *aDragTargetSize = mTargetSize;
1.126 + return NS_OK;
1.127 +}
1.128 +
1.129 +//-------------------------------------------------------------------------
1.130 +
1.131 +NS_IMETHODIMP
1.132 +nsBaseDragService::GetNumDropItems(uint32_t * aNumItems)
1.133 +{
1.134 + *aNumItems = 0;
1.135 + return NS_ERROR_FAILURE;
1.136 +}
1.137 +
1.138 +
1.139 +//
1.140 +// GetSourceDocument
1.141 +//
1.142 +// Returns the DOM document where the drag was initiated. This will be
1.143 +// nullptr if the drag began outside of our application.
1.144 +//
1.145 +NS_IMETHODIMP
1.146 +nsBaseDragService::GetSourceDocument(nsIDOMDocument** aSourceDocument)
1.147 +{
1.148 + *aSourceDocument = mSourceDocument.get();
1.149 + NS_IF_ADDREF(*aSourceDocument);
1.150 +
1.151 + return NS_OK;
1.152 +}
1.153 +
1.154 +//
1.155 +// GetSourceNode
1.156 +//
1.157 +// Returns the DOM node where the drag was initiated. This will be
1.158 +// nullptr if the drag began outside of our application.
1.159 +//
1.160 +NS_IMETHODIMP
1.161 +nsBaseDragService::GetSourceNode(nsIDOMNode** aSourceNode)
1.162 +{
1.163 + *aSourceNode = mSourceNode.get();
1.164 + NS_IF_ADDREF(*aSourceNode);
1.165 +
1.166 + return NS_OK;
1.167 +}
1.168 +
1.169 +
1.170 +//-------------------------------------------------------------------------
1.171 +
1.172 +NS_IMETHODIMP
1.173 +nsBaseDragService::GetData(nsITransferable * aTransferable,
1.174 + uint32_t aItemIndex)
1.175 +{
1.176 + return NS_ERROR_FAILURE;
1.177 +}
1.178 +
1.179 +//-------------------------------------------------------------------------
1.180 +NS_IMETHODIMP
1.181 +nsBaseDragService::IsDataFlavorSupported(const char *aDataFlavor,
1.182 + bool *_retval)
1.183 +{
1.184 + return NS_ERROR_FAILURE;
1.185 +}
1.186 +
1.187 +NS_IMETHODIMP
1.188 +nsBaseDragService::GetDataTransfer(nsIDOMDataTransfer** aDataTransfer)
1.189 +{
1.190 + *aDataTransfer = mDataTransfer;
1.191 + NS_IF_ADDREF(*aDataTransfer);
1.192 + return NS_OK;
1.193 +}
1.194 +
1.195 +NS_IMETHODIMP
1.196 +nsBaseDragService::SetDataTransfer(nsIDOMDataTransfer* aDataTransfer)
1.197 +{
1.198 + mDataTransfer = aDataTransfer;
1.199 + return NS_OK;
1.200 +}
1.201 +
1.202 +//-------------------------------------------------------------------------
1.203 +NS_IMETHODIMP
1.204 +nsBaseDragService::InvokeDragSession(nsIDOMNode *aDOMNode,
1.205 + nsISupportsArray* aTransferableArray,
1.206 + nsIScriptableRegion* aDragRgn,
1.207 + uint32_t aActionType)
1.208 +{
1.209 + NS_ENSURE_TRUE(aDOMNode, NS_ERROR_INVALID_ARG);
1.210 + NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
1.211 +
1.212 + // stash the document of the dom node
1.213 + aDOMNode->GetOwnerDocument(getter_AddRefs(mSourceDocument));
1.214 + mSourceNode = aDOMNode;
1.215 + mEndDragPoint = nsIntPoint(0, 0);
1.216 +
1.217 + // When the mouse goes down, the selection code starts a mouse
1.218 + // capture. However, this gets in the way of determining drag
1.219 + // feedback for things like trees because the event coordinates
1.220 + // are in the wrong coord system, so turn off mouse capture.
1.221 + nsIPresShell::ClearMouseCapture(nullptr);
1.222 +
1.223 + return NS_OK;
1.224 +}
1.225 +
1.226 +NS_IMETHODIMP
1.227 +nsBaseDragService::InvokeDragSessionWithImage(nsIDOMNode* aDOMNode,
1.228 + nsISupportsArray* aTransferableArray,
1.229 + nsIScriptableRegion* aRegion,
1.230 + uint32_t aActionType,
1.231 + nsIDOMNode* aImage,
1.232 + int32_t aImageX, int32_t aImageY,
1.233 + nsIDOMDragEvent* aDragEvent,
1.234 + nsIDOMDataTransfer* aDataTransfer)
1.235 +{
1.236 + NS_ENSURE_TRUE(aDragEvent, NS_ERROR_NULL_POINTER);
1.237 + NS_ENSURE_TRUE(aDataTransfer, NS_ERROR_NULL_POINTER);
1.238 + NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
1.239 +
1.240 + mDataTransfer = aDataTransfer;
1.241 + mSelection = nullptr;
1.242 + mHasImage = true;
1.243 + mDragPopup = nullptr;
1.244 + mImage = aImage;
1.245 + mImageX = aImageX;
1.246 + mImageY = aImageY;
1.247 +
1.248 + aDragEvent->GetScreenX(&mScreenX);
1.249 + aDragEvent->GetScreenY(&mScreenY);
1.250 + aDragEvent->GetMozInputSource(&mInputSource);
1.251 +
1.252 + return InvokeDragSession(aDOMNode, aTransferableArray, aRegion, aActionType);
1.253 +}
1.254 +
1.255 +NS_IMETHODIMP
1.256 +nsBaseDragService::InvokeDragSessionWithSelection(nsISelection* aSelection,
1.257 + nsISupportsArray* aTransferableArray,
1.258 + uint32_t aActionType,
1.259 + nsIDOMDragEvent* aDragEvent,
1.260 + nsIDOMDataTransfer* aDataTransfer)
1.261 +{
1.262 + NS_ENSURE_TRUE(aSelection, NS_ERROR_NULL_POINTER);
1.263 + NS_ENSURE_TRUE(aDragEvent, NS_ERROR_NULL_POINTER);
1.264 + NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
1.265 +
1.266 + mDataTransfer = aDataTransfer;
1.267 + mSelection = aSelection;
1.268 + mHasImage = true;
1.269 + mDragPopup = nullptr;
1.270 + mImage = nullptr;
1.271 + mImageX = 0;
1.272 + mImageY = 0;
1.273 +
1.274 + aDragEvent->GetScreenX(&mScreenX);
1.275 + aDragEvent->GetScreenY(&mScreenY);
1.276 + aDragEvent->GetMozInputSource(&mInputSource);
1.277 +
1.278 + // just get the focused node from the selection
1.279 + // XXXndeakin this should actually be the deepest node that contains both
1.280 + // endpoints of the selection
1.281 + nsCOMPtr<nsIDOMNode> node;
1.282 + aSelection->GetFocusNode(getter_AddRefs(node));
1.283 +
1.284 + return InvokeDragSession(node, aTransferableArray, nullptr, aActionType);
1.285 +}
1.286 +
1.287 +//-------------------------------------------------------------------------
1.288 +NS_IMETHODIMP
1.289 +nsBaseDragService::GetCurrentSession(nsIDragSession ** aSession)
1.290 +{
1.291 + if (!aSession)
1.292 + return NS_ERROR_INVALID_ARG;
1.293 +
1.294 + // "this" also implements a drag session, so say we are one but only
1.295 + // if there is currently a drag going on.
1.296 + if (!mSuppressLevel && mDoingDrag) {
1.297 + *aSession = this;
1.298 + NS_ADDREF(*aSession); // addRef because we're a "getter"
1.299 + }
1.300 + else
1.301 + *aSession = nullptr;
1.302 +
1.303 + return NS_OK;
1.304 +}
1.305 +
1.306 +//-------------------------------------------------------------------------
1.307 +NS_IMETHODIMP
1.308 +nsBaseDragService::StartDragSession()
1.309 +{
1.310 + if (mDoingDrag) {
1.311 + return NS_ERROR_FAILURE;
1.312 + }
1.313 + mDoingDrag = true;
1.314 + // By default dispatch drop also to content.
1.315 + mOnlyChromeDrop = false;
1.316 +
1.317 + return NS_OK;
1.318 +}
1.319 +
1.320 +void
1.321 +nsBaseDragService::OpenDragPopup()
1.322 +{
1.323 + if (mDragPopup) {
1.324 + nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
1.325 + if (pm) {
1.326 + pm->ShowPopupAtScreen(mDragPopup, mScreenX - mImageX, mScreenY - mImageY, false, nullptr);
1.327 + }
1.328 + }
1.329 +}
1.330 +
1.331 +//-------------------------------------------------------------------------
1.332 +NS_IMETHODIMP
1.333 +nsBaseDragService::EndDragSession(bool aDoneDrag)
1.334 +{
1.335 + if (!mDoingDrag) {
1.336 + return NS_ERROR_FAILURE;
1.337 + }
1.338 +
1.339 + if (aDoneDrag && !mSuppressLevel)
1.340 + FireDragEventAtSource(NS_DRAGDROP_END);
1.341 +
1.342 + if (mDragPopup) {
1.343 + nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
1.344 + if (pm) {
1.345 + pm->HidePopup(mDragPopup, false, true, false, false);
1.346 + }
1.347 + }
1.348 +
1.349 + mDoingDrag = false;
1.350 +
1.351 + // release the source we've been holding on to.
1.352 + mSourceDocument = nullptr;
1.353 + mSourceNode = nullptr;
1.354 + mSelection = nullptr;
1.355 + mDataTransfer = nullptr;
1.356 + mHasImage = false;
1.357 + mUserCancelled = false;
1.358 + mDragPopup = nullptr;
1.359 + mImage = nullptr;
1.360 + mImageX = 0;
1.361 + mImageY = 0;
1.362 + mScreenX = -1;
1.363 + mScreenY = -1;
1.364 + mInputSource = nsIDOMMouseEvent::MOZ_SOURCE_MOUSE;
1.365 +
1.366 + return NS_OK;
1.367 +}
1.368 +
1.369 +NS_IMETHODIMP
1.370 +nsBaseDragService::FireDragEventAtSource(uint32_t aMsg)
1.371 +{
1.372 + if (mSourceNode && !mSuppressLevel) {
1.373 + nsCOMPtr<nsIDocument> doc = do_QueryInterface(mSourceDocument);
1.374 + if (doc) {
1.375 + nsCOMPtr<nsIPresShell> presShell = doc->GetShell();
1.376 + if (presShell) {
1.377 + nsEventStatus status = nsEventStatus_eIgnore;
1.378 + WidgetDragEvent event(true, aMsg, nullptr);
1.379 + event.inputSource = mInputSource;
1.380 + if (aMsg == NS_DRAGDROP_END) {
1.381 + event.refPoint.x = mEndDragPoint.x;
1.382 + event.refPoint.y = mEndDragPoint.y;
1.383 + event.userCancelled = mUserCancelled;
1.384 + }
1.385 +
1.386 + nsCOMPtr<nsIContent> content = do_QueryInterface(mSourceNode);
1.387 + return presShell->HandleDOMEventWithTarget(content, &event, &status);
1.388 + }
1.389 + }
1.390 + }
1.391 +
1.392 + return NS_OK;
1.393 +}
1.394 +
1.395 +/* This is used by Windows and Mac to update the position of a popup being
1.396 + * used as a drag image during the drag. This isn't used on GTK as it manages
1.397 + * the drag popup itself.
1.398 + */
1.399 +NS_IMETHODIMP
1.400 +nsBaseDragService::DragMoved(int32_t aX, int32_t aY)
1.401 +{
1.402 + if (mDragPopup) {
1.403 + nsIFrame* frame = mDragPopup->GetPrimaryFrame();
1.404 + if (frame && frame->GetType() == nsGkAtoms::menuPopupFrame) {
1.405 + (static_cast<nsMenuPopupFrame *>(frame))->MoveTo(aX - mImageX, aY - mImageY, true);
1.406 + }
1.407 + }
1.408 +
1.409 + return NS_OK;
1.410 +}
1.411 +
1.412 +static nsIPresShell*
1.413 +GetPresShellForContent(nsIDOMNode* aDOMNode)
1.414 +{
1.415 + nsCOMPtr<nsIContent> content = do_QueryInterface(aDOMNode);
1.416 + if (!content)
1.417 + return nullptr;
1.418 +
1.419 + nsCOMPtr<nsIDocument> document = content->GetCurrentDoc();
1.420 + if (document) {
1.421 + document->FlushPendingNotifications(Flush_Display);
1.422 +
1.423 + return document->GetShell();
1.424 + }
1.425 +
1.426 + return nullptr;
1.427 +}
1.428 +
1.429 +nsresult
1.430 +nsBaseDragService::DrawDrag(nsIDOMNode* aDOMNode,
1.431 + nsIScriptableRegion* aRegion,
1.432 + int32_t aScreenX, int32_t aScreenY,
1.433 + nsIntRect* aScreenDragRect,
1.434 + RefPtr<SourceSurface>* aSurface,
1.435 + nsPresContext** aPresContext)
1.436 +{
1.437 + *aSurface = nullptr;
1.438 + *aPresContext = nullptr;
1.439 +
1.440 + // use a default size, in case of an error.
1.441 + aScreenDragRect->x = aScreenX - mImageX;
1.442 + aScreenDragRect->y = aScreenY - mImageY;
1.443 + aScreenDragRect->width = 1;
1.444 + aScreenDragRect->height = 1;
1.445 +
1.446 + // if a drag image was specified, use that, otherwise, use the source node
1.447 + nsCOMPtr<nsIDOMNode> dragNode = mImage ? mImage.get() : aDOMNode;
1.448 +
1.449 + // get the presshell for the node being dragged. If the drag image is not in
1.450 + // a document or has no frame, get the presshell from the source drag node
1.451 + nsIPresShell* presShell = GetPresShellForContent(dragNode);
1.452 + if (!presShell && mImage)
1.453 + presShell = GetPresShellForContent(aDOMNode);
1.454 + if (!presShell)
1.455 + return NS_ERROR_FAILURE;
1.456 +
1.457 + *aPresContext = presShell->GetPresContext();
1.458 +
1.459 + // convert mouse position to dev pixels of the prescontext
1.460 + int32_t sx = aScreenX, sy = aScreenY;
1.461 + ConvertToUnscaledDevPixels(*aPresContext, &sx, &sy);
1.462 +
1.463 + aScreenDragRect->x = sx - mImageX;
1.464 + aScreenDragRect->y = sy - mImageY;
1.465 +
1.466 + // check if drag images are disabled
1.467 + bool enableDragImages = Preferences::GetBool(DRAGIMAGES_PREF, true);
1.468 +
1.469 + // didn't want an image, so just set the screen rectangle to the frame size
1.470 + if (!enableDragImages || !mHasImage) {
1.471 + // if a region was specified, set the screen rectangle to the area that
1.472 + // the region occupies
1.473 + if (aRegion) {
1.474 + // the region's coordinates are relative to the root frame
1.475 + nsIFrame* rootFrame = presShell->GetRootFrame();
1.476 + if (rootFrame && *aPresContext) {
1.477 + nsIntRect dragRect;
1.478 + aRegion->GetBoundingBox(&dragRect.x, &dragRect.y, &dragRect.width, &dragRect.height);
1.479 + dragRect = dragRect.ToAppUnits(nsPresContext::AppUnitsPerCSSPixel()).
1.480 + ToOutsidePixels((*aPresContext)->AppUnitsPerDevPixel());
1.481 +
1.482 + nsIntRect screenRect = rootFrame->GetScreenRectExternal();
1.483 + aScreenDragRect->SetRect(screenRect.x + dragRect.x, screenRect.y + dragRect.y,
1.484 + dragRect.width, dragRect.height);
1.485 + }
1.486 + }
1.487 + else {
1.488 + // otherwise, there was no region so just set the rectangle to
1.489 + // the size of the primary frame of the content.
1.490 + nsCOMPtr<nsIContent> content = do_QueryInterface(dragNode);
1.491 + nsIFrame* frame = content->GetPrimaryFrame();
1.492 + if (frame) {
1.493 + nsIntRect screenRect = frame->GetScreenRectExternal();
1.494 + aScreenDragRect->SetRect(screenRect.x, screenRect.y,
1.495 + screenRect.width, screenRect.height);
1.496 + }
1.497 + }
1.498 +
1.499 + return NS_OK;
1.500 + }
1.501 +
1.502 + // draw the image for selections
1.503 + if (mSelection) {
1.504 + nsIntPoint pnt(aScreenDragRect->x, aScreenDragRect->y);
1.505 + *aSurface = presShell->RenderSelection(mSelection, pnt, aScreenDragRect);
1.506 + return NS_OK;
1.507 + }
1.508 +
1.509 + // if a custom image was specified, check if it is an image node and draw
1.510 + // using the source rather than the displayed image. But if mImage isn't
1.511 + // an image or canvas, fall through to RenderNode below.
1.512 + if (mImage) {
1.513 + nsCOMPtr<nsIContent> content = do_QueryInterface(dragNode);
1.514 + HTMLCanvasElement *canvas = HTMLCanvasElement::FromContentOrNull(content);
1.515 + if (canvas) {
1.516 + return DrawDragForImage(*aPresContext, nullptr, canvas, sx, sy,
1.517 + aScreenDragRect, aSurface);
1.518 + }
1.519 +
1.520 + nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(dragNode);
1.521 + // for image nodes, create the drag image from the actual image data
1.522 + if (imageLoader) {
1.523 + return DrawDragForImage(*aPresContext, imageLoader, nullptr, sx, sy,
1.524 + aScreenDragRect, aSurface);
1.525 + }
1.526 +
1.527 + // If the image is a popup, use that as the image. This allows custom drag
1.528 + // images that can change during the drag, but means that any platform
1.529 + // default image handling won't occur.
1.530 + // XXXndeakin this should be chrome-only
1.531 +
1.532 + nsIFrame* frame = content->GetPrimaryFrame();
1.533 + if (frame && frame->GetType() == nsGkAtoms::menuPopupFrame) {
1.534 + mDragPopup = content;
1.535 + }
1.536 + }
1.537 +
1.538 + if (!mDragPopup) {
1.539 + // otherwise, just draw the node
1.540 + nsIntRegion clipRegion;
1.541 + if (aRegion) {
1.542 + aRegion->GetRegion(&clipRegion);
1.543 + }
1.544 +
1.545 + nsIntPoint pnt(aScreenDragRect->x, aScreenDragRect->y);
1.546 + *aSurface = presShell->RenderNode(dragNode, aRegion ? &clipRegion : nullptr,
1.547 + pnt, aScreenDragRect);
1.548 + }
1.549 +
1.550 + // if an image was specified, reposition the drag rectangle to
1.551 + // the supplied offset in mImageX and mImageY.
1.552 + if (mImage) {
1.553 + aScreenDragRect->x = sx - mImageX;
1.554 + aScreenDragRect->y = sy - mImageY;
1.555 + }
1.556 +
1.557 + return NS_OK;
1.558 +}
1.559 +
1.560 +nsresult
1.561 +nsBaseDragService::DrawDragForImage(nsPresContext* aPresContext,
1.562 + nsIImageLoadingContent* aImageLoader,
1.563 + HTMLCanvasElement* aCanvas,
1.564 + int32_t aScreenX, int32_t aScreenY,
1.565 + nsIntRect* aScreenDragRect,
1.566 + RefPtr<SourceSurface>* aSurface)
1.567 +{
1.568 + nsCOMPtr<imgIContainer> imgContainer;
1.569 + if (aImageLoader) {
1.570 + nsCOMPtr<imgIRequest> imgRequest;
1.571 + nsresult rv = aImageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
1.572 + getter_AddRefs(imgRequest));
1.573 + NS_ENSURE_SUCCESS(rv, rv);
1.574 + if (!imgRequest)
1.575 + return NS_ERROR_NOT_AVAILABLE;
1.576 +
1.577 + rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
1.578 + NS_ENSURE_SUCCESS(rv, rv);
1.579 + if (!imgContainer)
1.580 + return NS_ERROR_NOT_AVAILABLE;
1.581 +
1.582 + // use the size of the image as the size of the drag image
1.583 + imgContainer->GetWidth(&aScreenDragRect->width);
1.584 + imgContainer->GetHeight(&aScreenDragRect->height);
1.585 + }
1.586 + else {
1.587 + NS_ASSERTION(aCanvas, "both image and canvas are null");
1.588 + nsIntSize sz = aCanvas->GetSize();
1.589 + aScreenDragRect->width = sz.width;
1.590 + aScreenDragRect->height = sz.height;
1.591 + }
1.592 +
1.593 + nsIntSize srcSize = aScreenDragRect->Size();
1.594 + nsIntSize destSize = srcSize;
1.595 +
1.596 + if (destSize.width == 0 || destSize.height == 0)
1.597 + return NS_ERROR_FAILURE;
1.598 +
1.599 + // if the image is larger than half the screen size, scale it down. This
1.600 + // scaling algorithm is the same as is used in nsPresShell::PaintRangePaintInfo
1.601 + nsDeviceContext* deviceContext = aPresContext->DeviceContext();
1.602 + nsRect maxSize;
1.603 + deviceContext->GetClientRect(maxSize);
1.604 + nscoord maxWidth = aPresContext->AppUnitsToDevPixels(maxSize.width >> 1);
1.605 + nscoord maxHeight = aPresContext->AppUnitsToDevPixels(maxSize.height >> 1);
1.606 + if (destSize.width > maxWidth || destSize.height > maxHeight) {
1.607 + float scale = 1.0;
1.608 + if (destSize.width > maxWidth)
1.609 + scale = std::min(scale, float(maxWidth) / destSize.width);
1.610 + if (destSize.height > maxHeight)
1.611 + scale = std::min(scale, float(maxHeight) / destSize.height);
1.612 +
1.613 + destSize.width = NSToIntFloor(float(destSize.width) * scale);
1.614 + destSize.height = NSToIntFloor(float(destSize.height) * scale);
1.615 +
1.616 + aScreenDragRect->x = NSToIntFloor(aScreenX - float(mImageX) * scale);
1.617 + aScreenDragRect->y = NSToIntFloor(aScreenY - float(mImageY) * scale);
1.618 + aScreenDragRect->width = destSize.width;
1.619 + aScreenDragRect->height = destSize.height;
1.620 + }
1.621 +
1.622 + nsresult result = NS_OK;
1.623 + if (aImageLoader) {
1.624 + RefPtr<DrawTarget> dt =
1.625 + gfxPlatform::GetPlatform()->
1.626 + CreateOffscreenContentDrawTarget(destSize.ToIntSize(),
1.627 + SurfaceFormat::B8G8R8A8);
1.628 + if (!dt)
1.629 + return NS_ERROR_FAILURE;
1.630 +
1.631 + nsRefPtr<gfxContext> ctx = new gfxContext(dt);
1.632 + if (!ctx)
1.633 + return NS_ERROR_FAILURE;
1.634 +
1.635 + gfxRect outRect(0, 0, destSize.width, destSize.height);
1.636 + gfxMatrix scale =
1.637 + gfxMatrix().Scale(srcSize.width/outRect.Width(), srcSize.height/outRect.Height());
1.638 + nsIntRect imgSize(0, 0, srcSize.width, srcSize.height);
1.639 + imgContainer->Draw(ctx, GraphicsFilter::FILTER_GOOD, scale, outRect, imgSize,
1.640 + destSize, nullptr, imgIContainer::FRAME_CURRENT,
1.641 + imgIContainer::FLAG_SYNC_DECODE);
1.642 + *aSurface = dt->Snapshot();
1.643 + } else {
1.644 + *aSurface = aCanvas->GetSurfaceSnapshot();
1.645 + }
1.646 +
1.647 + return result;
1.648 +}
1.649 +
1.650 +void
1.651 +nsBaseDragService::ConvertToUnscaledDevPixels(nsPresContext* aPresContext,
1.652 + int32_t* aScreenX, int32_t* aScreenY)
1.653 +{
1.654 + int32_t adj = aPresContext->DeviceContext()->UnscaledAppUnitsPerDevPixel();
1.655 + *aScreenX = nsPresContext::CSSPixelsToAppUnits(*aScreenX) / adj;
1.656 + *aScreenY = nsPresContext::CSSPixelsToAppUnits(*aScreenY) / adj;
1.657 +}
1.658 +
1.659 +NS_IMETHODIMP
1.660 +nsBaseDragService::Suppress()
1.661 +{
1.662 + EndDragSession(false);
1.663 + ++mSuppressLevel;
1.664 + return NS_OK;
1.665 +}
1.666 +
1.667 +NS_IMETHODIMP
1.668 +nsBaseDragService::Unsuppress()
1.669 +{
1.670 + --mSuppressLevel;
1.671 + return NS_OK;
1.672 +}
