DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (27a812186ff4)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623
/* -*- 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 mozilla_MouseEvents_h__
#define mozilla_MouseEvents_h__

#include <stdint.h>

#include "mozilla/BasicEvents.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/dom/DataTransfer.h"
#include "nsCOMPtr.h"
#include "nsIDOMMouseEvent.h"
#include "nsIDOMWheelEvent.h"

/******************************************************************************
 * nsDragDropEventStatus
 ******************************************************************************/

enum nsDragDropEventStatus
{  
  // The event is a enter
  nsDragDropEventStatus_eDragEntered,
  // The event is exit
  nsDragDropEventStatus_eDragExited,
  // The event is drop
  nsDragDropEventStatus_eDrop
};

namespace mozilla {

namespace dom {
  class PBrowserParent;
  class PBrowserChild;
} // namespace dom

/******************************************************************************
 * mozilla::WidgetPointerHelper
 ******************************************************************************/

class WidgetPointerHelper
{
public:
  bool convertToPointer;
  uint32_t tiltX;
  uint32_t tiltY;

  WidgetPointerHelper() : convertToPointer(true), tiltX(0), tiltY(0) {}

  void AssignPointerHelperData(const WidgetPointerHelper& aEvent)
  {
    convertToPointer = aEvent.convertToPointer;
    tiltX = aEvent.tiltX;
    tiltY = aEvent.tiltY;
  }
};

/******************************************************************************
 * mozilla::WidgetMouseEventBase
 ******************************************************************************/

class WidgetMouseEventBase : public WidgetInputEvent
{
private:
  friend class dom::PBrowserParent;
  friend class dom::PBrowserChild;

protected:
  WidgetMouseEventBase()
  {
  }

  WidgetMouseEventBase(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget,
                       nsEventStructType aStructType) :
    WidgetInputEvent(aIsTrusted, aMessage, aWidget, aStructType),
    button(0), buttons(0), pressure(0),
    inputSource(nsIDOMMouseEvent::MOZ_SOURCE_MOUSE)
 {
 }

public:
  virtual WidgetMouseEventBase* AsMouseEventBase() MOZ_OVERRIDE { return this; }

  virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
  {
    MOZ_CRASH("WidgetMouseEventBase must not be most-subclass");
    return nullptr;
  }

  /// The possible related target
  nsCOMPtr<nsISupports> relatedTarget;

  enum buttonType
  {
    eLeftButton   = 0,
    eMiddleButton = 1,
    eRightButton  = 2
  };
  // Pressed button ID of mousedown or mouseup event.
  // This is set only when pressing a button causes the event.
  int16_t button;

  enum buttonsFlag {
    eLeftButtonFlag   = 0x01,
    eRightButtonFlag  = 0x02,
    eMiddleButtonFlag = 0x04,
    // typicall, "back" button being left side of 5-button
    // mice, see "buttons" attribute document of DOM3 Events.
    e4thButtonFlag    = 0x08,
    // typicall, "forward" button being right side of 5-button
    // mice, see "buttons" attribute document of DOM3 Events.
    e5thButtonFlag    = 0x10
  };

  // Flags of all pressed buttons at the event fired.
  // This is set at any mouse event, don't be confused with |button|.
  int16_t buttons;

  // Finger or touch pressure of event. It ranges between 0.0 and 1.0.
  float pressure;

  // Possible values at nsIDOMMouseEvent
  uint16_t inputSource;

  void AssignMouseEventBaseData(const WidgetMouseEventBase& aEvent,
                                bool aCopyTargets)
  {
    AssignInputEventData(aEvent, aCopyTargets);

    relatedTarget = aCopyTargets ? aEvent.relatedTarget : nullptr;
    button = aEvent.button;
    buttons = aEvent.buttons;
    pressure = aEvent.pressure;
    inputSource = aEvent.inputSource;
  }

  /**
   * Returns true if left click event.
   */
  bool IsLeftClickEvent() const
  {
    return message == NS_MOUSE_CLICK && button == eLeftButton;
  }
};

/******************************************************************************
 * mozilla::WidgetMouseEvent
 ******************************************************************************/

class WidgetMouseEvent : public WidgetMouseEventBase, public WidgetPointerHelper
{
private:
  friend class mozilla::dom::PBrowserParent;
  friend class mozilla::dom::PBrowserChild;

public:
  enum reasonType
  {
    eReal,
    eSynthesized
  };

  enum contextType
  {
    eNormal,
    eContextMenuKey
  };

  enum exitType
  {
    eChild,
    eTopLevel
  };

protected:
  WidgetMouseEvent()
  {
  }

  WidgetMouseEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget,
                   nsEventStructType aStructType, reasonType aReason) :
    WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, aStructType),
    acceptActivation(false), ignoreRootScrollFrame(false),
    reason(aReason), context(eNormal), exit(eChild), clickCount(0)
  {
    switch (aMessage) {
      case NS_MOUSE_MOVE:
        mFlags.mCancelable = false;
        break;
      case NS_MOUSEENTER:
      case NS_MOUSELEAVE:
        mFlags.mBubbles = false;
        mFlags.mCancelable = false;
        break;
      default:
        break;
    }
  }

public:
  virtual WidgetMouseEvent* AsMouseEvent() MOZ_OVERRIDE { return this; }

  WidgetMouseEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget,
                   reasonType aReason, contextType aContext = eNormal) :
    WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, NS_MOUSE_EVENT),
    acceptActivation(false), ignoreRootScrollFrame(false),
    reason(aReason), context(aContext), exit(eChild), clickCount(0)
  {
    switch (aMessage) {
      case NS_MOUSE_MOVE:
        mFlags.mCancelable = false;
        break;
      case NS_MOUSEENTER:
      case NS_MOUSELEAVE:
        mFlags.mBubbles = false;
        mFlags.mCancelable = false;
        break;
      case NS_CONTEXTMENU:
        button = (context == eNormal) ? eRightButton : eLeftButton;
        break;
      default:
        break;
    }
  }

#ifdef DEBUG
  virtual ~WidgetMouseEvent()
  {
    NS_WARN_IF_FALSE(message != NS_CONTEXTMENU ||
                     button ==
                       ((context == eNormal) ? eRightButton : eLeftButton),
                     "Wrong button set to NS_CONTEXTMENU event?");
  }
#endif

  virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
  {
    MOZ_ASSERT(eventStructType == NS_MOUSE_EVENT,
               "Duplicate() must be overridden by sub class");
    // Not copying widget, it is a weak reference.
    WidgetMouseEvent* result =
      new WidgetMouseEvent(false, message, nullptr, reason, context);
    result->AssignMouseEventData(*this, true);
    result->mFlags = mFlags;
    return result;
  }

  // Special return code for MOUSE_ACTIVATE to signal.
  // If the target accepts activation (1), or denies it (0).
  bool acceptActivation;
  // Whether the event should ignore scroll frame bounds during dispatch.
  bool ignoreRootScrollFrame;

  reasonType reason : 4;
  contextType context : 4;
  exitType exit;

  /// The number of mouse clicks.
  uint32_t clickCount;

  void AssignMouseEventData(const WidgetMouseEvent& aEvent, bool aCopyTargets)
  {
    AssignMouseEventBaseData(aEvent, aCopyTargets);
    AssignPointerHelperData(aEvent);

    acceptActivation = aEvent.acceptActivation;
    ignoreRootScrollFrame = aEvent.ignoreRootScrollFrame;
    clickCount = aEvent.clickCount;
  }

  /**
   * Returns true if the event is a context menu event caused by key.
   */
  bool IsContextMenuKeyEvent() const
  {
    return message == NS_CONTEXTMENU && context == eContextMenuKey;
  }
};

/******************************************************************************
 * mozilla::WidgetDragEvent
 ******************************************************************************/

class WidgetDragEvent : public WidgetMouseEvent
{
public:
  virtual WidgetDragEvent* AsDragEvent() MOZ_OVERRIDE { return this; }

  WidgetDragEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget) :
    WidgetMouseEvent(aIsTrusted, aMessage, aWidget, NS_DRAG_EVENT, eReal),
    userCancelled(false), mDefaultPreventedOnContent(false)
  {
    mFlags.mCancelable =
      (aMessage != NS_DRAGDROP_EXIT_SYNTH &&
       aMessage != NS_DRAGDROP_LEAVE_SYNTH &&
       aMessage != NS_DRAGDROP_END);
  }

  virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
  {
    MOZ_ASSERT(eventStructType == NS_DRAG_EVENT,
               "Duplicate() must be overridden by sub class");
    // Not copying widget, it is a weak reference.
    WidgetDragEvent* result = new WidgetDragEvent(false, message, nullptr);
    result->AssignDragEventData(*this, true);
    result->mFlags = mFlags;
    return result;
  }

  // The dragging data.
  nsCOMPtr<dom::DataTransfer> dataTransfer;

  // If this is true, user has cancelled the drag operation.
  bool userCancelled;
  // If this is true, the drag event's preventDefault() is called on content.
  bool mDefaultPreventedOnContent;

  // XXX Not tested by test_assign_event_data.html
  void AssignDragEventData(const WidgetDragEvent& aEvent, bool aCopyTargets)
  {
    AssignMouseEventData(aEvent, aCopyTargets);

    dataTransfer = aEvent.dataTransfer;
    // XXX userCancelled isn't copied, is this instentionally?
    userCancelled = false;
    mDefaultPreventedOnContent = aEvent.mDefaultPreventedOnContent;
  }
};

/******************************************************************************
 * mozilla::WidgetMouseScrollEvent
 *
 * This is used for legacy DOM mouse scroll events, i.e.,
 * DOMMouseScroll and MozMousePixelScroll event.  These events are NOT hanbled
 * by ESM even if widget dispatches them.  Use new WidgetWheelEvent instead.
 ******************************************************************************/

class WidgetMouseScrollEvent : public WidgetMouseEventBase
{
private:
  WidgetMouseScrollEvent()
  {
  }

public:
  virtual WidgetMouseScrollEvent* AsMouseScrollEvent() MOZ_OVERRIDE
  {
    return this;
  }

  WidgetMouseScrollEvent(bool aIsTrusted, uint32_t aMessage,
                         nsIWidget* aWidget) :
    WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, NS_MOUSE_SCROLL_EVENT),
    delta(0), isHorizontal(false)
  {
  }

  virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
  {
    MOZ_ASSERT(eventStructType == NS_MOUSE_SCROLL_EVENT,
               "Duplicate() must be overridden by sub class");
    // Not copying widget, it is a weak reference.
    WidgetMouseScrollEvent* result =
      new WidgetMouseScrollEvent(false, message, nullptr);
    result->AssignMouseScrollEventData(*this, true);
    result->mFlags = mFlags;
    return result;
  }

  // The delta value of mouse scroll event.
  // If the event message is NS_MOUSE_SCROLL, the value indicates scroll amount
  // in lines.  However, if the value is nsIDOMUIEvent::SCROLL_PAGE_UP or
  // nsIDOMUIEvent::SCROLL_PAGE_DOWN, the value inducates one page scroll.
  // If the event message is NS_MOUSE_PIXEL_SCROLL, the value indicates scroll
  // amount in pixels.
  int32_t delta;

  // If this is true, it may cause to scroll horizontally.
  // Otherwise, vertically.
  bool isHorizontal;

  void AssignMouseScrollEventData(const WidgetMouseScrollEvent& aEvent,
                                  bool aCopyTargets)
  {
    AssignMouseEventBaseData(aEvent, aCopyTargets);

    delta = aEvent.delta;
    isHorizontal = aEvent.isHorizontal;
  }
};

/******************************************************************************
 * mozilla::WidgetWheelEvent
 ******************************************************************************/

class WidgetWheelEvent : public WidgetMouseEventBase
{
private:
  friend class mozilla::dom::PBrowserParent;
  friend class mozilla::dom::PBrowserChild;

  WidgetWheelEvent()
  {
  }

public:
  virtual WidgetWheelEvent* AsWheelEvent() MOZ_OVERRIDE { return this; }

  WidgetWheelEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget) :
    WidgetMouseEventBase(aIsTrusted, aMessage, aWidget, NS_WHEEL_EVENT),
    deltaX(0.0), deltaY(0.0), deltaZ(0.0),
    deltaMode(nsIDOMWheelEvent::DOM_DELTA_PIXEL),
    customizedByUserPrefs(false), isMomentum(false), isPixelOnlyDevice(false),
    lineOrPageDeltaX(0), lineOrPageDeltaY(0), scrollType(SCROLL_DEFAULT),
    overflowDeltaX(0.0), overflowDeltaY(0.0),
    mViewPortIsOverscrolled(false)
  {
  }

  virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
  {
    MOZ_ASSERT(eventStructType == NS_WHEEL_EVENT,
               "Duplicate() must be overridden by sub class");
    // Not copying widget, it is a weak reference.
    WidgetWheelEvent* result = new WidgetWheelEvent(false, message, nullptr);
    result->AssignWheelEventData(*this, true);
    result->mFlags = mFlags;
    return result;
  }

  // NOTE: deltaX, deltaY and deltaZ may be customized by
  //       mousewheel.*.delta_multiplier_* prefs which are applied by
  //       nsEventStateManager.  So, after widget dispatches this event,
  //       these delta values may have different values than before.
  double deltaX;
  double deltaY;
  double deltaZ;

  // Should be one of nsIDOMWheelEvent::DOM_DELTA_*
  uint32_t deltaMode;

  // Following members are for internal use only, not for DOM event.

  // If the delta values are computed from prefs, this value is true.
  // Otherwise, i.e., they are computed from native events, false.
  bool customizedByUserPrefs;

  // true if the event is caused by momentum.
  bool isMomentum;

  // If device event handlers don't know when they should set lineOrPageDeltaX
  // and lineOrPageDeltaY, this is true.  Otherwise, false.
  // If isPixelOnlyDevice is true, ESM will generate NS_MOUSE_SCROLL events
  // when accumulated pixel delta values reach a line height.
  bool isPixelOnlyDevice;

  // If widget sets lineOrPageDelta, nsEventStateManager will dispatch
  // NS_MOUSE_SCROLL event for compatibility.  Note that the delta value means
  // pages if the deltaMode is DOM_DELTA_PAGE, otherwise, lines.
  int32_t lineOrPageDeltaX;
  int32_t lineOrPageDeltaY;

  // When the default action for an wheel event is moving history or zooming,
  // need to chose a delta value for doing it.
  int32_t GetPreferredIntDelta()
  {
    if (!lineOrPageDeltaX && !lineOrPageDeltaY) {
      return 0;
    }
    if (lineOrPageDeltaY && !lineOrPageDeltaX) {
      return lineOrPageDeltaY;
    }
    if (lineOrPageDeltaX && !lineOrPageDeltaY) {
      return lineOrPageDeltaX;
    }
    if ((lineOrPageDeltaX < 0 && lineOrPageDeltaY > 0) ||
        (lineOrPageDeltaX > 0 && lineOrPageDeltaY < 0)) {
      return 0; // We cannot guess the answer in this case.
    }
    return (Abs(lineOrPageDeltaX) > Abs(lineOrPageDeltaY)) ?
             lineOrPageDeltaX : lineOrPageDeltaY;
  }

  // Scroll type
  // The default value is SCROLL_DEFAULT, which means nsEventStateManager will
  // select preferred scroll type automatically.
  enum ScrollType
  {
    SCROLL_DEFAULT,
    SCROLL_SYNCHRONOUSLY,
    SCROLL_ASYNCHRONOUSELY,
    SCROLL_SMOOTHLY
  };
  ScrollType scrollType;

  // overflowed delta values for scroll, these values are set by
  // nsEventStateManger.  If the default action of the wheel event isn't scroll,
  // these values always zero.  Otherwise, remaning delta values which are
  // not used by scroll are set.
  // NOTE: deltaX, deltaY and deltaZ may be modified by nsEventStateManager.
  //       However, overflowDeltaX and overflowDeltaY indicate unused original
  //       delta values which are not applied the delta_multiplier prefs.
  //       So, if widget wanted to know the actual direction to be scrolled,
  //       it would need to check the deltaX and deltaY.
  double overflowDeltaX;
  double overflowDeltaY;

  // Whether or not the parent of the currently overscrolled frame is the
  // ViewPort. This is false in situations when an element on the page is being
  // overscrolled (such as a text field), but true when the 'page' is being
  // overscrolled.
  bool mViewPortIsOverscrolled;

  void AssignWheelEventData(const WidgetWheelEvent& aEvent, bool aCopyTargets)
  {
    AssignMouseEventBaseData(aEvent, aCopyTargets);

    deltaX = aEvent.deltaX;
    deltaY = aEvent.deltaY;
    deltaZ = aEvent.deltaZ;
    deltaMode = aEvent.deltaMode;
    customizedByUserPrefs = aEvent.customizedByUserPrefs;
    isMomentum = aEvent.isMomentum;
    isPixelOnlyDevice = aEvent.isPixelOnlyDevice;
    lineOrPageDeltaX = aEvent.lineOrPageDeltaX;
    lineOrPageDeltaY = aEvent.lineOrPageDeltaY;
    scrollType = aEvent.scrollType;
    overflowDeltaX = aEvent.overflowDeltaX;
    overflowDeltaY = aEvent.overflowDeltaY;
    mViewPortIsOverscrolled = aEvent.mViewPortIsOverscrolled;
  }
};

/******************************************************************************
 * mozilla::WidgetPointerEvent
 ******************************************************************************/

class WidgetPointerEvent : public WidgetMouseEvent
{
  friend class mozilla::dom::PBrowserParent;
  friend class mozilla::dom::PBrowserChild;

  WidgetPointerEvent()
  {
  }

public:
  virtual WidgetPointerEvent* AsPointerEvent() MOZ_OVERRIDE { return this; }

  WidgetPointerEvent(bool aIsTrusted, uint32_t aMsg, nsIWidget* w)
    : WidgetMouseEvent(aIsTrusted, aMsg, w, NS_POINTER_EVENT, eReal)
    , pointerId(0)
    , width(0)
    , height(0)
    , isPrimary(true)
  {
    UpdateFlags();
  }

  WidgetPointerEvent(const WidgetMouseEvent& aEvent)
    : WidgetMouseEvent(aEvent)
    , pointerId(0)
    , width(0)
    , height(0)
    , isPrimary(true)
  {
    eventStructType = NS_POINTER_EVENT;
    UpdateFlags();
  }

  void UpdateFlags()
  {
    switch (message) {
      case NS_POINTER_ENTER:
      case NS_POINTER_LEAVE:
        mFlags.mBubbles = false;
        mFlags.mCancelable = false;
        break;
      case NS_POINTER_CANCEL:
      case NS_POINTER_GOT_CAPTURE:
      case NS_POINTER_LOST_CAPTURE:
        mFlags.mCancelable = false;
        break;
      default:
        break;
    }
  }

  virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
  {
    MOZ_ASSERT(eventStructType == NS_POINTER_EVENT,
               "Duplicate() must be overridden by sub class");
    // Not copying widget, it is a weak reference.
    WidgetPointerEvent* result =
      new WidgetPointerEvent(false, message, nullptr);
    result->AssignPointerEventData(*this, true);
    result->mFlags = mFlags;
    return result;
  }

  uint32_t pointerId;
  uint32_t width;
  uint32_t height;
  bool isPrimary;

  // XXX Not tested by test_assign_event_data.html
  void AssignPointerEventData(const WidgetPointerEvent& aEvent,
                              bool aCopyTargets)
  {
    AssignMouseEventData(aEvent, aCopyTargets);

    pointerId = aEvent.pointerId;
    width = aEvent.width;
    height = aEvent.height;
    isPrimary = aEvent.isPrimary;
  }
};

} // namespace mozilla

#endif // mozilla_MouseEvents_h__