1 files changed, 214 insertions, 0 deletions
diff --git a/widget/nsBaseDragService.h b/widget/nsBaseDragService.h
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+++ b/widget/nsBaseDragService.h
@@ -0,0 +1,214 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsBaseDragService_h__
+#define nsBaseDragService_h__
+
+#include "nsIDragService.h"
+#include "nsIDragSession.h"
+#include "nsCOMPtr.h"
+#include "nsRect.h"
+#include "nsPoint.h"
+#include "nsString.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/HTMLCanvasElement.h"
+#include "mozilla/dom/RemoteDragStartData.h"
+#include "nsTArray.h"
+#include "nsRegion.h"
+#include "Units.h"
+
+// translucency level for drag images
+#define DRAG_TRANSLUCENCY 0.65
+
+class nsIContent;
+
+class nsINode;
+class nsPresContext;
+class nsIImageLoadingContent;
+
+namespace mozilla {
+namespace gfx {
+class SourceSurface;
+}  // namespace gfx
+
+namespace dom {
+class DataTransfer;
+class Selection;
+}  // namespace dom
+}  // namespace mozilla
+
+/**
+ * XP DragService wrapper base class
+ */
+
+class nsBaseDragService : public nsIDragService, public nsIDragSession {
+ public:
+  typedef mozilla::gfx::SourceSurface SourceSurface;
+
+  nsBaseDragService();
+
+  // nsISupports
+  NS_DECL_ISUPPORTS
+
+  // nsIDragSession and nsIDragService
+  NS_DECL_NSIDRAGSERVICE
+  NS_DECL_NSIDRAGSESSION
+
+  void SetDragEndPoint(nsIntPoint aEndDragPoint) {
+    mEndDragPoint =
+        mozilla::LayoutDeviceIntPoint::FromUnknownPoint(aEndDragPoint);
+  }
+  void SetDragEndPoint(mozilla::LayoutDeviceIntPoint aEndDragPoint) {
+    mEndDragPoint = aEndDragPoint;
+  }
+
+  uint16_t GetInputSource() { return mInputSource; }
+
+  int32_t TakeChildProcessDragAction();
+
+ protected:
+  virtual ~nsBaseDragService();
+
+  /**
+   * Called from nsBaseDragService to initiate a platform drag from a source
+   * in this process.  This is expected to ensure that StartDragSession() and
+   * EndDragSession() get called if the platform drag is successfully invoked.
+   */
+  MOZ_CAN_RUN_SCRIPT virtual nsresult InvokeDragSessionImpl(
+      nsIArray* aTransferableArray,
+      const mozilla::Maybe<mozilla::CSSIntRegion>& aRegion,
+      uint32_t aActionType) = 0;
+
+  /**
+   * Draw the drag image, if any, to a surface and return it. The drag image
+   * is constructed from mImage if specified, or aDOMNode if mImage is null.
+   *
+   * aRegion may be used to draw only a subset of the element. This region
+   * should be supplied using x and y coordinates measured in css pixels
+   * that are relative to the upper-left corner of the window.
+   *
+   * aScreenPosition should be the screen coordinates of the mouse click
+   * for the drag. These are in CSS pixels.
+   *
+   * On return, aScreenDragRect will contain the screen coordinates of the
+   * area being dragged. This is used by the platform-specific part of the
+   * drag service to determine the drag feedback. This rect will be in the
+   * device pixels of the presContext.
+   *
+   * If there is no drag image, the returned surface will be null, but
+   * aScreenDragRect will still be set to the drag area.
+   *
+   * aPresContext will be set to the nsPresContext used determined from
+   * whichever of mImage or aDOMNode is used.
+   */
+  nsresult DrawDrag(nsINode* aDOMNode,
+                    const mozilla::Maybe<mozilla::CSSIntRegion>& aRegion,
+                    mozilla::CSSIntPoint aScreenPosition,
+                    mozilla::LayoutDeviceIntRect* aScreenDragRect,
+                    RefPtr<SourceSurface>* aSurface,
+                    nsPresContext** aPresContext);
+
+  /**
+   * Draw a drag image for an image node specified by aImageLoader or aCanvas.
+   * This is called by DrawDrag.
+   */
+  nsresult DrawDragForImage(nsPresContext* aPresContext,
+                            nsIImageLoadingContent* aImageLoader,
+                            mozilla::dom::HTMLCanvasElement* aCanvas,
+                            mozilla::LayoutDeviceIntRect* aScreenDragRect,
+                            RefPtr<SourceSurface>* aSurface);
+
+  /**
+   * If the drag image is a popup, open the popup when the drag begins.
+   */
+  void OpenDragPopup();
+
+  /**
+   * Free resources contained in DataTransferItems that aren't needed by JS.
+   */
+  void DiscardInternalTransferData();
+
+  // Returns true if a drag event was dispatched to a child process after
+  // the previous TakeDragEventDispatchedToChildProcess() call.
+  bool TakeDragEventDispatchedToChildProcess() {
+    bool retval = mDragEventDispatchedToChildProcess;
+    mDragEventDispatchedToChildProcess = false;
+    return retval;
+  }
+
+  bool mCanDrop;
+  bool mOnlyChromeDrop;
+  bool mDoingDrag;
+  bool mSessionIsSynthesizedForTests;
+  bool mIsDraggingTextInTextControl;
+
+  // true if in EndDragSession
+  bool mEndingSession;
+  // true if mImage should be used to set a drag image
+  bool mHasImage;
+  // true if the user cancelled the drag operation
+  bool mUserCancelled;
+
+  bool mDragEventDispatchedToChildProcess;
+
+  uint32_t mDragAction;
+  uint32_t mDragActionFromChildProcess;
+
+  // mEffectAllowedForTests stores allowed effects at invoking the drag
+  // for tests.
+  uint32_t mEffectAllowedForTests;
+
+  nsCOMPtr<nsINode> mSourceNode;
+  nsCOMPtr<nsIPrincipal> mTriggeringPrincipal;
+  nsCOMPtr<nsIContentSecurityPolicy> mCsp;
+
+  // the document at the drag source. will be null if it came from outside the
+  // app.
+  RefPtr<mozilla::dom::Document> mSourceDocument;
+
+  RefPtr<mozilla::dom::WindowContext> mSourceWindowContext;
+  RefPtr<mozilla::dom::WindowContext> mSourceTopWindowContext;
+
+  // the contentpolicy type passed to the channel when initiating the drag
+  // session
+  nsContentPolicyType mContentPolicyType;
+
+  RefPtr<mozilla::dom::DataTransfer> mDataTransfer;
+
+  // used to determine the image to appear on the cursor while dragging
+  nsCOMPtr<nsINode> mImage;
+  // offset of cursor within the image
+  mozilla::CSSIntPoint mImageOffset;
+
+  // set if a selection is being dragged
+  RefPtr<mozilla::dom::Selection> mSelection;
+
+  // remote drag data
+  RefPtr<mozilla::dom::RemoteDragStartData> mDragStartData;
+
+  // set if the image in mImage is a popup. If this case, the popup will be
+  // opened and moved instead of using a drag image.
+  nsCOMPtr<mozilla::dom::Element> mDragPopup;
+
+  // the screen position where drag gesture occurred, used for positioning the
+  // drag image.
+  mozilla::CSSIntPoint mScreenPosition;
+
+  // The position relative to the top level widget where the drag ended.
+  mozilla::LayoutDeviceIntPoint mEndDragPoint;
+
+  uint32_t mSuppressLevel;
+
+  // The input source of the drag event. Possible values are from MouseEvent.
+  uint16_t mInputSource;
+
+  nsTArray<RefPtr<mozilla::dom::ContentParent>> mChildProcesses;
+
+  // Sub-region for tree-selections.
+  mozilla::Maybe<mozilla::CSSIntRegion> mRegion;
+};
+
+#endif  // nsBaseDragService_h__