pjs/widget/xpwidgets/nsBaseDragService.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mats Palmgren <mats.palmgren@bredband.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsBaseDragService.h"
#include "nsITransferable.h"
#include "nsIServiceManager.h"
#include "nsITransferable.h"
#include "nsISupportsArray.h"
#include "nsSize.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsCOMPtr.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIFrame.h"
#include "nsIDocument.h"
#include "nsIContent.h"
#include "nsIPresShell.h"
#include "nsIViewManager.h"
#include "nsIDOMNode.h"
#include "nsIDOMDragEvent.h"
#include "nsISelection.h"
#include "nsISelectionPrivate.h"
#include "nsPresContext.h"
#include "nsIDOMDataTransfer.h"
#include "nsICanvasElementExternal.h"
#include "nsIImageLoadingContent.h"
#include "imgIContainer.h"
#include "imgIRequest.h"
#include "nsRegion.h"
#include "nsGUIEvent.h"
#include "nsXULPopupManager.h"
#include "nsMenuPopupFrame.h"
#include "mozilla/Preferences.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
using namespace mozilla;
#define DRAGIMAGES_PREF "nglayout.enable_drag_images"
nsBaseDragService::nsBaseDragService()
: mCanDrop(false), mOnlyChromeDrop(false), mDoingDrag(false),
mHasImage(false), mUserCancelled(false),
mDragAction(DRAGDROP_ACTION_NONE), mTargetSize(0,0),
mImageX(0), mImageY(0), mScreenX(-1), mScreenY(-1), mSuppressLevel(0),
mInputSource(nsIDOMMouseEvent::MOZ_SOURCE_MOUSE)
{
}
nsBaseDragService::~nsBaseDragService()
{
}
NS_IMPL_ISUPPORTS2(nsBaseDragService, nsIDragService, nsIDragSession)
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::SetCanDrop(bool aCanDrop)
{
mCanDrop = aCanDrop;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetCanDrop(bool * aCanDrop)
{
*aCanDrop = mCanDrop;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::SetOnlyChromeDrop(bool aOnlyChrome)
{
mOnlyChromeDrop = aOnlyChrome;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetOnlyChromeDrop(bool* aOnlyChrome)
{
*aOnlyChrome = mOnlyChromeDrop;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::SetDragAction(PRUint32 anAction)
{
mDragAction = anAction;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetDragAction(PRUint32 * anAction)
{
*anAction = mDragAction;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::SetTargetSize(nsSize aDragTargetSize)
{
mTargetSize = aDragTargetSize;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetTargetSize(nsSize * aDragTargetSize)
{
*aDragTargetSize = mTargetSize;
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetNumDropItems(PRUint32 * aNumItems)
{
*aNumItems = 0;
return NS_ERROR_FAILURE;
}
//
// GetSourceDocument
//
// Returns the DOM document where the drag was initiated. This will be
// nsnull if the drag began outside of our application.
//
NS_IMETHODIMP
nsBaseDragService::GetSourceDocument(nsIDOMDocument** aSourceDocument)
{
*aSourceDocument = mSourceDocument.get();
NS_IF_ADDREF(*aSourceDocument);
return NS_OK;
}
//
// GetSourceNode
//
// Returns the DOM node where the drag was initiated. This will be
// nsnull if the drag began outside of our application.
//
NS_IMETHODIMP
nsBaseDragService::GetSourceNode(nsIDOMNode** aSourceNode)
{
*aSourceNode = mSourceNode.get();
NS_IF_ADDREF(*aSourceNode);
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetData(nsITransferable * aTransferable,
PRUint32 aItemIndex)
{
return NS_ERROR_FAILURE;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::IsDataFlavorSupported(const char *aDataFlavor,
bool *_retval)
{
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsBaseDragService::GetDataTransfer(nsIDOMDataTransfer** aDataTransfer)
{
*aDataTransfer = mDataTransfer;
NS_IF_ADDREF(*aDataTransfer);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::SetDataTransfer(nsIDOMDataTransfer* aDataTransfer)
{
mDataTransfer = aDataTransfer;
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::InvokeDragSession(nsIDOMNode *aDOMNode,
nsISupportsArray* aTransferableArray,
nsIScriptableRegion* aDragRgn,
PRUint32 aActionType)
{
NS_ENSURE_TRUE(aDOMNode, NS_ERROR_INVALID_ARG);
NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
// stash the document of the dom node
aDOMNode->GetOwnerDocument(getter_AddRefs(mSourceDocument));
mSourceNode = aDOMNode;
mEndDragPoint = nsIntPoint(0, 0);
// When the mouse goes down, the selection code starts a mouse
// capture. However, this gets in the way of determining drag
// feedback for things like trees because the event coordinates
// are in the wrong coord system, so turn off mouse capture.
nsIPresShell::ClearMouseCapture(nsnull);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::InvokeDragSessionWithImage(nsIDOMNode* aDOMNode,
nsISupportsArray* aTransferableArray,
nsIScriptableRegion* aRegion,
PRUint32 aActionType,
nsIDOMNode* aImage,
PRInt32 aImageX, PRInt32 aImageY,
nsIDOMDragEvent* aDragEvent,
nsIDOMDataTransfer* aDataTransfer)
{
NS_ENSURE_TRUE(aDragEvent, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(aDataTransfer, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
mDataTransfer = aDataTransfer;
mSelection = nsnull;
mHasImage = true;
mDragPopup = nsnull;
mImage = aImage;
mImageX = aImageX;
mImageY = aImageY;
aDragEvent->GetScreenX(&mScreenX);
aDragEvent->GetScreenY(&mScreenY);
aDragEvent->GetMozInputSource(&mInputSource);
return InvokeDragSession(aDOMNode, aTransferableArray, aRegion, aActionType);
}
NS_IMETHODIMP
nsBaseDragService::InvokeDragSessionWithSelection(nsISelection* aSelection,
nsISupportsArray* aTransferableArray,
PRUint32 aActionType,
nsIDOMDragEvent* aDragEvent,
nsIDOMDataTransfer* aDataTransfer)
{
NS_ENSURE_TRUE(aSelection, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(aDragEvent, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
mDataTransfer = aDataTransfer;
mSelection = aSelection;
mHasImage = true;
mDragPopup = nsnull;
mImage = nsnull;
mImageX = 0;
mImageY = 0;
aDragEvent->GetScreenX(&mScreenX);
aDragEvent->GetScreenY(&mScreenY);
aDragEvent->GetMozInputSource(&mInputSource);
// just get the focused node from the selection
// XXXndeakin this should actually be the deepest node that contains both
// endpoints of the selection
nsCOMPtr<nsIDOMNode> node;
aSelection->GetFocusNode(getter_AddRefs(node));
return InvokeDragSession(node, aTransferableArray, nsnull, aActionType);
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetCurrentSession(nsIDragSession ** aSession)
{
if (!aSession)
return NS_ERROR_INVALID_ARG;
// "this" also implements a drag session, so say we are one but only
// if there is currently a drag going on.
if (!mSuppressLevel && mDoingDrag) {
*aSession = this;
NS_ADDREF(*aSession); // addRef because we're a "getter"
}
else
*aSession = nsnull;
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::StartDragSession()
{
if (mDoingDrag) {
return NS_ERROR_FAILURE;
}
mDoingDrag = true;
// By default dispatch drop also to content.
mOnlyChromeDrop = false;
return NS_OK;
}
void
nsBaseDragService::OpenDragPopup()
{
if (mDragPopup) {
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
pm->ShowPopupAtScreen(mDragPopup, mScreenX - mImageX, mScreenY - mImageY, false, nsnull);
}
}
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::EndDragSession(bool aDoneDrag)
{
if (!mDoingDrag) {
return NS_ERROR_FAILURE;
}
if (aDoneDrag && !mSuppressLevel)
FireDragEventAtSource(NS_DRAGDROP_END);
if (mDragPopup) {
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
pm->HidePopup(mDragPopup, false, true, false);
}
}
mDoingDrag = false;
// release the source we've been holding on to.
mSourceDocument = nsnull;
mSourceNode = nsnull;
mSelection = nsnull;
mDataTransfer = nsnull;
mHasImage = false;
mUserCancelled = false;
mDragPopup = nsnull;
mImage = nsnull;
mImageX = 0;
mImageY = 0;
mScreenX = -1;
mScreenY = -1;
mInputSource = nsIDOMMouseEvent::MOZ_SOURCE_MOUSE;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::FireDragEventAtSource(PRUint32 aMsg)
{
if (mSourceNode && !mSuppressLevel) {
nsCOMPtr<nsIDocument> doc = do_QueryInterface(mSourceDocument);
if (doc) {
nsCOMPtr<nsIPresShell> presShell = doc->GetShell();
if (presShell) {
nsEventStatus status = nsEventStatus_eIgnore;
nsDragEvent event(true, aMsg, nsnull);
event.inputSource = mInputSource;
if (aMsg == NS_DRAGDROP_END) {
event.refPoint.x = mEndDragPoint.x;
event.refPoint.y = mEndDragPoint.y;
event.userCancelled = mUserCancelled;
}
nsCOMPtr<nsIContent> content = do_QueryInterface(mSourceNode);
return presShell->HandleDOMEventWithTarget(content, &event, &status);
}
}
}
return NS_OK;
}
/* This is used by Windows and Mac to update the position of a popup being
* used as a drag image during the drag. This isn't used on GTK as it manages
* the drag popup itself.
*/
NS_IMETHODIMP
nsBaseDragService::DragMoved(PRInt32 aX, PRInt32 aY)
{
if (mDragPopup) {
nsIFrame* frame = mDragPopup->GetPrimaryFrame();
if (frame && frame->GetType() == nsGkAtoms::menuPopupFrame) {
(static_cast<nsMenuPopupFrame *>(frame))->MoveTo(aX - mImageX, aY - mImageY, true);
}
}
return NS_OK;
}
static nsIPresShell*
GetPresShellForContent(nsIDOMNode* aDOMNode)
{
nsCOMPtr<nsIContent> content = do_QueryInterface(aDOMNode);
if (!content)
return nsnull;
nsCOMPtr<nsIDocument> document = content->GetCurrentDoc();
if (document) {
document->FlushPendingNotifications(Flush_Display);
return document->GetShell();
}
return nsnull;
}
nsresult
nsBaseDragService::DrawDrag(nsIDOMNode* aDOMNode,
nsIScriptableRegion* aRegion,
PRInt32 aScreenX, PRInt32 aScreenY,
nsIntRect* aScreenDragRect,
gfxASurface** aSurface,
nsPresContext** aPresContext)
{
*aSurface = nsnull;
*aPresContext = nsnull;
// use a default size, in case of an error.
aScreenDragRect->x = aScreenX - mImageX;
aScreenDragRect->y = aScreenY - mImageY;
aScreenDragRect->width = 1;
aScreenDragRect->height = 1;
// if a drag image was specified, use that, otherwise, use the source node
nsCOMPtr<nsIDOMNode> dragNode = mImage ? mImage.get() : aDOMNode;
// get the presshell for the node being dragged. If the drag image is not in
// a document or has no frame, get the presshell from the source drag node
nsIPresShell* presShell = GetPresShellForContent(dragNode);
if (!presShell && mImage)
presShell = GetPresShellForContent(aDOMNode);
if (!presShell)
return NS_ERROR_FAILURE;
*aPresContext = presShell->GetPresContext();
// check if drag images are disabled
bool enableDragImages = Preferences::GetBool(DRAGIMAGES_PREF, true);
// didn't want an image, so just set the screen rectangle to the frame size
if (!enableDragImages || !mHasImage) {
// if a region was specified, set the screen rectangle to the area that
// the region occupies
if (aRegion) {
// the region's coordinates are relative to the root frame
nsIFrame* rootFrame = presShell->GetRootFrame();
if (rootFrame && *aPresContext) {
nsIntRect dragRect;
aRegion->GetBoundingBox(&dragRect.x, &dragRect.y, &dragRect.width, &dragRect.height);
dragRect = dragRect.ToAppUnits(nsPresContext::AppUnitsPerCSSPixel()).
ToOutsidePixels((*aPresContext)->AppUnitsPerDevPixel());
nsIntRect screenRect = rootFrame->GetScreenRectExternal();
aScreenDragRect->SetRect(screenRect.x + dragRect.x, screenRect.y + dragRect.y,
dragRect.width, dragRect.height);
}
}
else {
// otherwise, there was no region so just set the rectangle to
// the size of the primary frame of the content.
nsCOMPtr<nsIContent> content = do_QueryInterface(dragNode);
nsIFrame* frame = content->GetPrimaryFrame();
if (frame) {
nsIntRect screenRect = frame->GetScreenRectExternal();
aScreenDragRect->SetRect(screenRect.x, screenRect.y,
screenRect.width, screenRect.height);
}
}
return NS_OK;
}
// draw the image for selections
if (mSelection) {
nsIntPoint pnt(aScreenDragRect->x, aScreenDragRect->y);
nsRefPtr<gfxASurface> surface = presShell->RenderSelection(mSelection, pnt, aScreenDragRect);
*aSurface = surface;
NS_IF_ADDREF(*aSurface);
return NS_OK;
}
// if a custom image was specified, check if it is an image node and draw
// using the source rather than the displayed image. But if mImage isn't
// an image or canvas, fall through to RenderNode below.
if (mImage) {
nsCOMPtr<nsICanvasElementExternal> canvas = do_QueryInterface(dragNode);
if (canvas) {
return DrawDragForImage(*aPresContext, nsnull, canvas, aScreenX,
aScreenY, aScreenDragRect, aSurface);
}
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(dragNode);
// for image nodes, create the drag image from the actual image data
if (imageLoader) {
return DrawDragForImage(*aPresContext, imageLoader, nsnull, aScreenX,
aScreenY, aScreenDragRect, aSurface);
}
// If the image is a popup, use that as the image. This allows custom drag
// images that can change during the drag, but means that any platform
// default image handling won't occur.
// XXXndeakin this should be chrome-only
nsCOMPtr<nsIContent> content = do_QueryInterface(dragNode);
nsIFrame* frame = content->GetPrimaryFrame();
if (frame && frame->GetType() == nsGkAtoms::menuPopupFrame) {
mDragPopup = content;
}
}
nsRefPtr<gfxASurface> surface;
if (!mDragPopup) {
// otherwise, just draw the node
nsIntRegion clipRegion;
if (aRegion) {
aRegion->GetRegion(&clipRegion);
}
nsIntPoint pnt(aScreenDragRect->x, aScreenDragRect->y);
surface = presShell->RenderNode(dragNode, aRegion ? &clipRegion : nsnull,
pnt, aScreenDragRect);
}
// if an image was specified, reposition the drag rectangle to
// the supplied offset in mImageX and mImageY.
if (mImage) {
aScreenDragRect->x = aScreenX - mImageX;
aScreenDragRect->y = aScreenY - mImageY;
}
*aSurface = surface;
NS_IF_ADDREF(*aSurface);
return NS_OK;
}
nsresult
nsBaseDragService::DrawDragForImage(nsPresContext* aPresContext,
nsIImageLoadingContent* aImageLoader,
nsICanvasElementExternal* aCanvas,
PRInt32 aScreenX, PRInt32 aScreenY,
nsIntRect* aScreenDragRect,
gfxASurface** aSurface)
{
nsCOMPtr<imgIContainer> imgContainer;
if (aImageLoader) {
nsCOMPtr<imgIRequest> imgRequest;
nsresult rv = aImageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgRequest));
NS_ENSURE_SUCCESS(rv, rv);
if (!imgRequest)
return NS_ERROR_NOT_AVAILABLE;
rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
NS_ENSURE_SUCCESS(rv, rv);
if (!imgContainer)
return NS_ERROR_NOT_AVAILABLE;
// use the size of the image as the size of the drag image
imgContainer->GetWidth(&aScreenDragRect->width);
imgContainer->GetHeight(&aScreenDragRect->height);
}
else {
NS_ASSERTION(aCanvas, "both image and canvas are null");
nsIntSize sz = aCanvas->GetSizeExternal();
aScreenDragRect->width = sz.width;
aScreenDragRect->height = sz.height;
}
nsIntSize srcSize = aScreenDragRect->Size();
nsIntSize destSize = srcSize;
if (destSize.width == 0 || destSize.height == 0)
return NS_ERROR_FAILURE;
// if the image is larger than half the screen size, scale it down. This
// scaling algorithm is the same as is used in nsPresShell::PaintRangePaintInfo
nsDeviceContext* deviceContext = aPresContext->DeviceContext();
nsRect maxSize;
deviceContext->GetClientRect(maxSize);
nscoord maxWidth = aPresContext->AppUnitsToDevPixels(maxSize.width >> 1);
nscoord maxHeight = aPresContext->AppUnitsToDevPixels(maxSize.height >> 1);
if (destSize.width > maxWidth || destSize.height > maxHeight) {
float scale = 1.0;
if (destSize.width > maxWidth)
scale = NS_MIN(scale, float(maxWidth) / destSize.width);
if (destSize.height > maxHeight)
scale = NS_MIN(scale, float(maxHeight) / destSize.height);
destSize.width = NSToIntFloor(float(destSize.width) * scale);
destSize.height = NSToIntFloor(float(destSize.height) * scale);
aScreenDragRect->x = NSToIntFloor(aScreenX - float(mImageX) * scale);
aScreenDragRect->y = NSToIntFloor(aScreenY - float(mImageY) * scale);
aScreenDragRect->width = destSize.width;
aScreenDragRect->height = destSize.height;
}
nsRefPtr<gfxASurface> surface =
gfxPlatform::GetPlatform()->CreateOffscreenSurface(gfxIntSize(destSize.width, destSize.height),
gfxASurface::CONTENT_COLOR_ALPHA);
if (!surface)
return NS_ERROR_FAILURE;
nsRefPtr<gfxContext> ctx = new gfxContext(surface);
if (!ctx)
return NS_ERROR_FAILURE;
*aSurface = surface;
NS_ADDREF(*aSurface);
if (aImageLoader) {
gfxRect outRect(0, 0, destSize.width, destSize.height);
gfxMatrix scale =
gfxMatrix().Scale(srcSize.width/outRect.Width(), srcSize.height/outRect.Height());
nsIntRect imgSize(0, 0, srcSize.width, srcSize.height);
imgContainer->Draw(ctx, gfxPattern::FILTER_GOOD, scale, outRect, imgSize,
destSize, imgIContainer::FLAG_SYNC_DECODE);
return NS_OK;
} else {
return aCanvas->RenderContextsExternal(ctx, gfxPattern::FILTER_GOOD);
}
}
void
nsBaseDragService::ConvertToUnscaledDevPixels(nsPresContext* aPresContext,
PRInt32* aScreenX, PRInt32* aScreenY)
{
PRInt32 adj = aPresContext->DeviceContext()->UnscaledAppUnitsPerDevPixel();
*aScreenX = nsPresContext::CSSPixelsToAppUnits(*aScreenX) / adj;
*aScreenY = nsPresContext::CSSPixelsToAppUnits(*aScreenY) / adj;
}
NS_IMETHODIMP
nsBaseDragService::Suppress()
{
EndDragSession(false);
++mSuppressLevel;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::Unsuppress()
{
--mSuppressLevel;
return NS_OK;
}