view/nsView.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "nsView.h"
   7
   8 #include "mozilla/Attributes.h"
   9 #include "mozilla/BasicEvents.h"
  10 #include "mozilla/DebugOnly.h"
  11 #include "mozilla/IntegerPrintfMacros.h"
  12 #include "mozilla/Likely.h"
  13 #include "mozilla/Poison.h"
  14 #include "nsIWidget.h"
  15 #include "nsViewManager.h"
  16 #include "nsIFrame.h"
  17 #include "nsPresArena.h"
  18 #include "nsXULPopupManager.h"
  19 #include "nsIWidgetListener.h"
  20 #include "nsContentUtils.h" // for nsAutoScriptBlocker
  21
  22 using namespace mozilla;
  23
  24 nsView::nsView(nsViewManager* aViewManager, nsViewVisibility aVisibility)
  25 {
  26   MOZ_COUNT_CTOR(nsView);
  27
  28   mVis = aVisibility;
  29   // Views should be transparent by default. Not being transparent is
  30   // a promise that the view will paint all its pixels opaquely. Views
  31   // should make this promise explicitly by calling
  32   // SetViewContentTransparency.
  33   mVFlags = 0;
  34   mViewManager = aViewManager;
  35   mDirtyRegion = nullptr;
  36   mWidgetIsTopLevel = false;
  37 }
  38
  39 void nsView::DropMouseGrabbing()
  40 {
  41   nsIPresShell* presShell = mViewManager->GetPresShell();
  42   if (presShell)
  43     presShell->ClearMouseCaptureOnView(this);
  44 }
  45
  46 nsView::~nsView()
  47 {
  48   MOZ_COUNT_DTOR(nsView);
  49
  50   while (GetFirstChild())
  51   {
  52     nsView* child = GetFirstChild();
  53     if (child->GetViewManager() == mViewManager) {
  54       child->Destroy();
  55     } else {
  56       // just unhook it. Someone else will want to destroy this.
  57       RemoveChild(child);
  58     }
  59   }
  60
  61   if (mViewManager)
  62   {
  63     DropMouseGrabbing();
  64
  65     nsView *rootView = mViewManager->GetRootView();
  66
  67     if (rootView)
  68     {
  69       // Root views can have parents!
  70       if (mParent)
  71       {
  72         mViewManager->RemoveChild(this);
  73       }
  74
  75       if (rootView == this)
  76       {
  77         // Inform the view manager that the root view has gone away...
  78         mViewManager->SetRootView(nullptr);
  79       }
  80     }
  81     else if (mParent)
  82     {
  83       mParent->RemoveChild(this);
  84     }
  85
  86     mViewManager = nullptr;
  87   }
  88   else if (mParent)
  89   {
  90     mParent->RemoveChild(this);
  91   }
  92
  93   // Destroy and release the widget
  94   DestroyWidget();
  95
  96   delete mDirtyRegion;
  97 }
  98
  99 class DestroyWidgetRunnable : public nsRunnable {
 100 public:
 101   NS_DECL_NSIRUNNABLE
 102
 103   explicit DestroyWidgetRunnable(nsIWidget* aWidget) : mWidget(aWidget) {}
 104
 105 private:
 106   nsCOMPtr<nsIWidget> mWidget;
 107 };
 108
 109 NS_IMETHODIMP DestroyWidgetRunnable::Run()
 110 {
 111   mWidget->Destroy();
 112   mWidget = nullptr;
 113   return NS_OK;
 114 }
 115
 116
 117 void nsView::DestroyWidget()
 118 {
 119   if (mWindow)
 120   {
 121     // If we are not attached to a base window, we're going to tear down our
 122     // widget here. However, if we're attached to somebody elses widget, we
 123     // want to leave the widget alone: don't reset the client data or call
 124     // Destroy. Just clear our event view ptr and free our reference to it.
 125     if (mWidgetIsTopLevel) {
 126       mWindow->SetAttachedWidgetListener(nullptr);
 127     }
 128     else {
 129       mWindow->SetWidgetListener(nullptr);
 130
 131       nsCOMPtr<nsIRunnable> widgetDestroyer =
 132         new DestroyWidgetRunnable(mWindow);
 133
 134       NS_DispatchToMainThread(widgetDestroyer);
 135     }
 136
 137     NS_RELEASE(mWindow);
 138   }
 139 }
 140
 141 nsView* nsView::GetViewFor(nsIWidget* aWidget)
 142 {
 143   NS_PRECONDITION(nullptr != aWidget, "null widget ptr");
 144
 145   nsIWidgetListener* listener = aWidget->GetWidgetListener();
 146   if (listener) {
 147     nsView* view = listener->GetView();
 148     if (view)
 149       return view;
 150   }
 151
 152   listener = aWidget->GetAttachedWidgetListener();
 153   return listener ? listener->GetView() : nullptr;
 154 }
 155
 156 void nsView::Destroy()
 157 {
 158   this->~nsView();
 159   mozWritePoison(this, sizeof(*this));
 160   nsView::operator delete(this);
 161 }
 162
 163 void nsView::SetPosition(nscoord aX, nscoord aY)
 164 {
 165   mDimBounds.x += aX - mPosX;
 166   mDimBounds.y += aY - mPosY;
 167   mPosX = aX;
 168   mPosY = aY;
 169
 170   NS_ASSERTION(GetParent() || (aX == 0 && aY == 0),
 171                "Don't try to move the root widget to something non-zero");
 172
 173   ResetWidgetBounds(true, false);
 174 }
 175
 176 void nsView::ResetWidgetBounds(bool aRecurse, bool aForceSync)
 177 {
 178   if (mWindow) {
 179     if (!aForceSync) {
 180       // Don't change widget geometry synchronously, since that can
 181       // cause synchronous painting.
 182       mViewManager->PostPendingUpdate();
 183     } else {
 184       DoResetWidgetBounds(false, true);
 185     }
 186     return;
 187   }
 188
 189   if (aRecurse) {
 190     // reposition any widgets under this view
 191     for (nsView* v = GetFirstChild(); v; v = v->GetNextSibling()) {
 192       v->ResetWidgetBounds(true, aForceSync);
 193     }
 194   }
 195 }
 196
 197 bool nsView::IsEffectivelyVisible()
 198 {
 199   for (nsView* v = this; v; v = v->mParent) {
 200     if (v->GetVisibility() == nsViewVisibility_kHide)
 201       return false;
 202   }
 203   return true;
 204 }
 205
 206 nsIntRect nsView::CalcWidgetBounds(nsWindowType aType)
 207 {
 208   int32_t p2a = mViewManager->AppUnitsPerDevPixel();
 209
 210   nsRect viewBounds(mDimBounds);
 211
 212   nsView* parent = GetParent();
 213   nsIWidget* parentWidget = nullptr;
 214   if (parent) {
 215     nsPoint offset;
 216     parentWidget = parent->GetNearestWidget(&offset, p2a);
 217     // make viewBounds be relative to the parent widget, in appunits
 218     viewBounds += offset;
 219
 220     if (parentWidget && aType == eWindowType_popup &&
 221         IsEffectivelyVisible()) {
 222       // put offset into screen coordinates. (based on client area origin)
 223       nsIntPoint screenPoint = parentWidget->WidgetToScreenOffset();
 224       viewBounds += nsPoint(NSIntPixelsToAppUnits(screenPoint.x, p2a),
 225                             NSIntPixelsToAppUnits(screenPoint.y, p2a));
 226     }
 227   }
 228
 229   // Compute widget bounds in device pixels
 230   nsIntRect newBounds = viewBounds.ToNearestPixels(p2a);
 231
 232 #ifdef XP_MACOSX
 233   // cocoa rounds widget coordinates to the nearest global "display pixel"
 234   // integer value. So we avoid fractional display pixel values by rounding
 235   // to the nearest value that won't yield a fractional display pixel.
 236   nsIWidget* widget = parentWidget ? parentWidget : mWindow;
 237   uint32_t round;
 238   if (aType == eWindowType_popup && widget &&
 239       ((round = widget->RoundsWidgetCoordinatesTo()) > 1)) {
 240     nsIntSize pixelRoundedSize = newBounds.Size();
 241     // round the top left and bottom right to the nearest round pixel
 242     newBounds.x = NSToIntRoundUp(NSAppUnitsToDoublePixels(viewBounds.x, p2a) / round) * round;
 243     newBounds.y = NSToIntRoundUp(NSAppUnitsToDoublePixels(viewBounds.y, p2a) / round) * round;
 244     newBounds.width =
 245       NSToIntRoundUp(NSAppUnitsToDoublePixels(viewBounds.XMost(), p2a) / round) * round - newBounds.x;
 246     newBounds.height =
 247       NSToIntRoundUp(NSAppUnitsToDoublePixels(viewBounds.YMost(), p2a) / round) * round - newBounds.y;
 248     // but if that makes the widget larger then our frame may not paint the
 249     // extra pixels, so reduce the size to the nearest round value
 250     if (newBounds.width > pixelRoundedSize.width) {
 251       newBounds.width -= round;
 252     }
 253     if (newBounds.height > pixelRoundedSize.height) {
 254       newBounds.height -= round;
 255     }
 256   }
 257 #endif
 258
 259   // Compute where the top-left of our widget ended up relative to the parent
 260   // widget, in appunits.
 261   nsPoint roundedOffset(NSIntPixelsToAppUnits(newBounds.x, p2a),
 262                         NSIntPixelsToAppUnits(newBounds.y, p2a));
 263
 264   // mViewToWidgetOffset is added to coordinates relative to the view origin
 265   // to get coordinates relative to the widget.
 266   // The view origin, relative to the parent widget, is at
 267   // (mPosX,mPosY) - mDimBounds.TopLeft() + viewBounds.TopLeft().
 268   // Our widget, relative to the parent widget, is roundedOffset.
 269   mViewToWidgetOffset = nsPoint(mPosX, mPosY)
 270     - mDimBounds.TopLeft() + viewBounds.TopLeft() - roundedOffset;
 271
 272   return newBounds;
 273 }
 274
 275 void nsView::DoResetWidgetBounds(bool aMoveOnly,
 276                                  bool aInvalidateChangedSize) {
 277   // The geometry of a root view's widget is controlled externally,
 278   // NOT by sizing or positioning the view
 279   if (mViewManager->GetRootView() == this) {
 280     return;
 281   }
 282
 283   NS_PRECONDITION(mWindow, "Why was this called??");
 284
 285   // Hold this ref to make sure it stays alive.
 286   nsCOMPtr<nsIWidget> widget = mWindow;
 287
 288   // Stash a copy of these and use them so we can handle this being deleted (say
 289   // from sync painting/flushing from Show/Move/Resize on the widget).
 290   nsIntRect newBounds;
 291   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
 292
 293   nsWindowType type = widget->WindowType();
 294
 295   nsIntRect curBounds;
 296   widget->GetClientBounds(curBounds);
 297   bool invisiblePopup = type == eWindowType_popup &&
 298                         ((curBounds.IsEmpty() && mDimBounds.IsEmpty()) ||
 299                          mVis == nsViewVisibility_kHide);
 300
 301   if (invisiblePopup) {
 302     // We're going to hit the early exit below, avoid calling CalcWidgetBounds.
 303   } else {
 304     newBounds = CalcWidgetBounds(type);
 305   }
 306
 307   bool curVisibility = widget->IsVisible();
 308   bool newVisibility = IsEffectivelyVisible();
 309   if (curVisibility && !newVisibility) {
 310     widget->Show(false);
 311   }
 312
 313   if (invisiblePopup) {
 314     // Don't manipulate empty or hidden popup widgets. For example there's no
 315     // point moving hidden comboboxes around, or doing X server roundtrips
 316     // to compute their true screen position. This could mean that WidgetToScreen
 317     // operations on these widgets don't return up-to-date values, but popup
 318     // positions aren't reliable anyway because of correction to be on or off-screen.
 319     return;
 320   }
 321
 322   bool changedPos = curBounds.TopLeft() != newBounds.TopLeft();
 323   bool changedSize = curBounds.Size() != newBounds.Size();
 324
 325   // Child views are never attached to top level widgets, this is safe.
 326
 327   // Coordinates are converted to display pixels for window Move/Resize APIs,
 328   // because of the potential for device-pixel coordinate spaces for mixed
 329   // hidpi/lodpi screens to overlap each other and result in bad placement
 330   // (bug 814434).
 331   double invScale;
 332
 333   // Bug 861270: for correct widget manipulation at arbitrary scale factors,
 334   // prefer to base scaling on widget->GetDefaultScale(). But only do this if
 335   // it matches the view manager's device context scale after allowing for the
 336   // quantization to app units, because of OS X multiscreen issues (where the
 337   // only two scales are 1.0 or 2.0, and so the quantization doesn't actually
 338   // cause problems anyhow).
 339   // In the case of a mismatch, fall back to scaling based on the dev context's
 340   // AppUnitsPerDevPixelAtUnitFullZoom value. On platforms where the device-pixel
 341   // scale is uniform across all displays (currently all except OS X), we'll
 342   // always use the precise value from mWindow->GetDefaultScale here.
 343   CSSToLayoutDeviceScale scale = widget->GetDefaultScale();
 344   if (NSToIntRound(60.0 / scale.scale) == dx->AppUnitsPerDevPixelAtUnitFullZoom()) {
 345     invScale = 1.0 / scale.scale;
 346   } else {
 347     invScale = dx->AppUnitsPerDevPixelAtUnitFullZoom() / 60.0;
 348   }
 349
 350   if (changedPos) {
 351     if (changedSize && !aMoveOnly) {
 352       widget->ResizeClient(newBounds.x * invScale,
 353                            newBounds.y * invScale,
 354                            newBounds.width * invScale,
 355                            newBounds.height * invScale,
 356                            aInvalidateChangedSize);
 357     } else {
 358       widget->MoveClient(newBounds.x * invScale,
 359                          newBounds.y * invScale);
 360     }
 361   } else {
 362     if (changedSize && !aMoveOnly) {
 363       widget->ResizeClient(newBounds.width * invScale,
 364                            newBounds.height * invScale,
 365                            aInvalidateChangedSize);
 366     } // else do nothing!
 367   }
 368
 369   if (!curVisibility && newVisibility) {
 370     widget->Show(true);
 371   }
 372 }
 373
 374 void nsView::SetDimensions(const nsRect& aRect, bool aPaint, bool aResizeWidget)
 375 {
 376   nsRect dims = aRect;
 377   dims.MoveBy(mPosX, mPosY);
 378
 379   // Don't use nsRect's operator== here, since it returns true when
 380   // both rects are empty even if they have different widths and we
 381   // have cases where that sort of thing matters to us.
 382   if (mDimBounds.TopLeft() == dims.TopLeft() &&
 383       mDimBounds.Size() == dims.Size()) {
 384     return;
 385   }
 386
 387   mDimBounds = dims;
 388
 389   if (aResizeWidget) {
 390     ResetWidgetBounds(false, false);
 391   }
 392 }
 393
 394 void nsView::NotifyEffectiveVisibilityChanged(bool aEffectivelyVisible)
 395 {
 396   if (!aEffectivelyVisible)
 397   {
 398     DropMouseGrabbing();
 399   }
 400
 401   SetForcedRepaint(true);
 402
 403   if (nullptr != mWindow)
 404   {
 405     ResetWidgetBounds(false, false);
 406   }
 407
 408   for (nsView* child = mFirstChild; child; child = child->mNextSibling) {
 409     if (child->mVis == nsViewVisibility_kHide) {
 410       // It was effectively hidden and still is
 411       continue;
 412     }
 413     // Our child is visible if we are
 414     child->NotifyEffectiveVisibilityChanged(aEffectivelyVisible);
 415   }
 416 }
 417
 418 void nsView::SetVisibility(nsViewVisibility aVisibility)
 419 {
 420   mVis = aVisibility;
 421   NotifyEffectiveVisibilityChanged(IsEffectivelyVisible());
 422 }
 423
 424 void nsView::SetFloating(bool aFloatingView)
 425 {
 426         if (aFloatingView)
 427                 mVFlags |= NS_VIEW_FLAG_FLOATING;
 428         else
 429                 mVFlags &= ~NS_VIEW_FLAG_FLOATING;
 430 }
 431
 432 void nsView::InvalidateHierarchy(nsViewManager *aViewManagerParent)
 433 {
 434   if (mViewManager->GetRootView() == this)
 435     mViewManager->InvalidateHierarchy();
 436
 437   for (nsView *child = mFirstChild; child; child = child->GetNextSibling())
 438     child->InvalidateHierarchy(aViewManagerParent);
 439 }
 440
 441 void nsView::InsertChild(nsView *aChild, nsView *aSibling)
 442 {
 443   NS_PRECONDITION(nullptr != aChild, "null ptr");
 444
 445   if (nullptr != aChild)
 446   {
 447     if (nullptr != aSibling)
 448     {
 449 #ifdef DEBUG
 450       NS_ASSERTION(aSibling->GetParent() == this, "tried to insert view with invalid sibling");
 451 #endif
 452       //insert after sibling
 453       aChild->SetNextSibling(aSibling->GetNextSibling());
 454       aSibling->SetNextSibling(aChild);
 455     }
 456     else
 457     {
 458       aChild->SetNextSibling(mFirstChild);
 459       mFirstChild = aChild;
 460     }
 461     aChild->SetParent(this);
 462
 463     // If we just inserted a root view, then update the RootViewManager
 464     // on all view managers in the new subtree.
 465
 466     nsViewManager *vm = aChild->GetViewManager();
 467     if (vm->GetRootView() == aChild)
 468     {
 469       aChild->InvalidateHierarchy(nullptr); // don't care about releasing grabs
 470     }
 471   }
 472 }
 473
 474 void nsView::RemoveChild(nsView *child)
 475 {
 476   NS_PRECONDITION(nullptr != child, "null ptr");
 477
 478   if (nullptr != child)
 479   {
 480     nsView* prevKid = nullptr;
 481     nsView* kid = mFirstChild;
 482     DebugOnly<bool> found = false;
 483     while (nullptr != kid) {
 484       if (kid == child) {
 485         if (nullptr != prevKid) {
 486           prevKid->SetNextSibling(kid->GetNextSibling());
 487         } else {
 488           mFirstChild = kid->GetNextSibling();
 489         }
 490         child->SetParent(nullptr);
 491         found = true;
 492         break;
 493       }
 494       prevKid = kid;
 495             kid = kid->GetNextSibling();
 496     }
 497     NS_ASSERTION(found, "tried to remove non child");
 498
 499     // If we just removed a root view, then update the RootViewManager
 500     // on all view managers in the removed subtree.
 501
 502     nsViewManager *vm = child->GetViewManager();
 503     if (vm->GetRootView() == child)
 504     {
 505       child->InvalidateHierarchy(GetViewManager());
 506     }
 507   }
 508 }
 509
 510 // Native widgets ultimately just can't deal with the awesome power of
 511 // CSS2 z-index. However, we set the z-index on the widget anyway
 512 // because in many simple common cases the widgets do end up in the
 513 // right order. We set each widget's z-index to the z-index of the
 514 // nearest ancestor that has non-auto z-index.
 515 static void UpdateNativeWidgetZIndexes(nsView* aView, int32_t aZIndex)
 516 {
 517   if (aView->HasWidget()) {
 518     nsIWidget* widget = aView->GetWidget();
 519     if (widget->GetZIndex() != aZIndex) {
 520       widget->SetZIndex(aZIndex);
 521     }
 522   } else {
 523     for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
 524       if (v->GetZIndexIsAuto()) {
 525         UpdateNativeWidgetZIndexes(v, aZIndex);
 526       }
 527     }
 528   }
 529 }
 530
 531 static int32_t FindNonAutoZIndex(nsView* aView)
 532 {
 533   while (aView) {
 534     if (!aView->GetZIndexIsAuto()) {
 535       return aView->GetZIndex();
 536     }
 537     aView = aView->GetParent();
 538   }
 539   return 0;
 540 }
 541
 542 struct DefaultWidgetInitData : public nsWidgetInitData {
 543   DefaultWidgetInitData() : nsWidgetInitData()
 544   {
 545     mWindowType = eWindowType_child;
 546     clipChildren = true;
 547     clipSiblings = true;
 548   }
 549 };
 550
 551 nsresult nsView::CreateWidget(nsWidgetInitData *aWidgetInitData,
 552                                bool aEnableDragDrop,
 553                                bool aResetVisibility)
 554 {
 555   AssertNoWindow();
 556   NS_ABORT_IF_FALSE(!aWidgetInitData ||
 557                     aWidgetInitData->mWindowType != eWindowType_popup,
 558                     "Use CreateWidgetForPopup");
 559
 560   DefaultWidgetInitData defaultInitData;
 561   bool initDataPassedIn = !!aWidgetInitData;
 562   aWidgetInitData = aWidgetInitData ? aWidgetInitData : &defaultInitData;
 563   defaultInitData.mListenForResizes =
 564     (!initDataPassedIn && GetParent() &&
 565      GetParent()->GetViewManager() != mViewManager);
 566
 567   nsIntRect trect = CalcWidgetBounds(aWidgetInitData->mWindowType);
 568
 569   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
 570
 571   nsIWidget* parentWidget =
 572     GetParent() ? GetParent()->GetNearestWidget(nullptr) : nullptr;
 573   if (!parentWidget) {
 574     NS_ERROR("nsView::CreateWidget without suitable parent widget??");
 575     return NS_ERROR_FAILURE;
 576   }
 577
 578   // XXX: using aForceUseIWidgetParent=true to preserve previous
 579   // semantics.  It's not clear that it's actually needed.
 580   mWindow = parentWidget->CreateChild(trect, dx, aWidgetInitData,
 581                                       true).take();
 582   if (!mWindow) {
 583     return NS_ERROR_FAILURE;
 584   }
 585
 586   InitializeWindow(aEnableDragDrop, aResetVisibility);
 587
 588   return NS_OK;
 589 }
 590
 591 nsresult nsView::CreateWidgetForParent(nsIWidget* aParentWidget,
 592                                         nsWidgetInitData *aWidgetInitData,
 593                                         bool aEnableDragDrop,
 594                                         bool aResetVisibility)
 595 {
 596   AssertNoWindow();
 597   NS_ABORT_IF_FALSE(!aWidgetInitData ||
 598                     aWidgetInitData->mWindowType != eWindowType_popup,
 599                     "Use CreateWidgetForPopup");
 600   NS_ABORT_IF_FALSE(aParentWidget, "Parent widget required");
 601
 602   DefaultWidgetInitData defaultInitData;
 603   aWidgetInitData = aWidgetInitData ? aWidgetInitData : &defaultInitData;
 604
 605   nsIntRect trect = CalcWidgetBounds(aWidgetInitData->mWindowType);
 606
 607   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
 608
 609   mWindow =
 610     aParentWidget->CreateChild(trect, dx, aWidgetInitData).take();
 611   if (!mWindow) {
 612     return NS_ERROR_FAILURE;
 613   }
 614
 615   InitializeWindow(aEnableDragDrop, aResetVisibility);
 616
 617   return NS_OK;
 618 }
 619
 620 nsresult nsView::CreateWidgetForPopup(nsWidgetInitData *aWidgetInitData,
 621                                        nsIWidget* aParentWidget,
 622                                        bool aEnableDragDrop,
 623                                        bool aResetVisibility)
 624 {
 625   AssertNoWindow();
 626   NS_ABORT_IF_FALSE(aWidgetInitData, "Widget init data required");
 627   NS_ABORT_IF_FALSE(aWidgetInitData->mWindowType == eWindowType_popup,
 628                     "Use one of the other CreateWidget methods");
 629
 630   nsIntRect trect = CalcWidgetBounds(aWidgetInitData->mWindowType);
 631
 632   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
 633
 634   // XXX/cjones: having these two separate creation cases seems ... um
 635   // ... unnecessary, but it's the way the old code did it.  Please
 636   // unify them by first finding a suitable parent nsIWidget, then
 637   // getting rid of aForceUseIWidgetParent.
 638   if (aParentWidget) {
 639     // XXX: using aForceUseIWidgetParent=true to preserve previous
 640     // semantics.  It's not clear that it's actually needed.
 641     mWindow = aParentWidget->CreateChild(trect, dx, aWidgetInitData,
 642                                          true).take();
 643   }
 644   else {
 645     nsIWidget* nearestParent = GetParent() ? GetParent()->GetNearestWidget(nullptr)
 646                                            : nullptr;
 647     if (!nearestParent) {
 648       // Without a parent, we can't make a popup.  This can happen
 649       // when printing
 650       return NS_ERROR_FAILURE;
 651     }
 652
 653     mWindow =
 654       nearestParent->CreateChild(trect, dx, aWidgetInitData).take();
 655   }
 656   if (!mWindow) {
 657     return NS_ERROR_FAILURE;
 658   }
 659
 660   InitializeWindow(aEnableDragDrop, aResetVisibility);
 661
 662   return NS_OK;
 663 }
 664
 665 void
 666 nsView::InitializeWindow(bool aEnableDragDrop, bool aResetVisibility)
 667 {
 668   NS_ABORT_IF_FALSE(mWindow, "Must have a window to initialize");
 669
 670   mWindow->SetWidgetListener(this);
 671
 672   if (aEnableDragDrop) {
 673     mWindow->EnableDragDrop(true);
 674   }
 675
 676   // propagate the z-index to the widget.
 677   UpdateNativeWidgetZIndexes(this, FindNonAutoZIndex(this));
 678
 679   //make sure visibility state is accurate
 680
 681   if (aResetVisibility) {
 682     SetVisibility(GetVisibility());
 683   }
 684 }
 685
 686 // Attach to a top level widget and start receiving mirrored events.
 687 nsresult nsView::AttachToTopLevelWidget(nsIWidget* aWidget)
 688 {
 689   NS_PRECONDITION(nullptr != aWidget, "null widget ptr");
 690   /// XXXjimm This is a temporary workaround to an issue w/document
 691   // viewer (bug 513162).
 692   nsIWidgetListener* listener = aWidget->GetAttachedWidgetListener();
 693   if (listener) {
 694     nsView *oldView = listener->GetView();
 695     if (oldView) {
 696       oldView->DetachFromTopLevelWidget();
 697     }
 698   }
 699
 700   nsRefPtr<nsDeviceContext> dx = mViewManager->GetDeviceContext();
 701
 702   // Note, the previous device context will be released. Detaching
 703   // will not restore the old one.
 704   nsresult rv = aWidget->AttachViewToTopLevel(!nsIWidget::UsePuppetWidgets(), dx);
 705   if (NS_FAILED(rv))
 706     return rv;
 707
 708   mWindow = aWidget;
 709   NS_ADDREF(mWindow);
 710
 711   mWindow->SetAttachedWidgetListener(this);
 712   mWindow->EnableDragDrop(true);
 713   mWidgetIsTopLevel = true;
 714
 715   // Refresh the view bounds
 716   CalcWidgetBounds(mWindow->WindowType());
 717
 718   return NS_OK;
 719 }
 720
 721 // Detach this view from an attached widget.
 722 nsresult nsView::DetachFromTopLevelWidget()
 723 {
 724   NS_PRECONDITION(mWidgetIsTopLevel, "Not attached currently!");
 725   NS_PRECONDITION(mWindow, "null mWindow for DetachFromTopLevelWidget!");
 726
 727   mWindow->SetAttachedWidgetListener(nullptr);
 728   NS_RELEASE(mWindow);
 729
 730   mWidgetIsTopLevel = false;
 731
 732   return NS_OK;
 733 }
 734
 735 void nsView::SetZIndex(bool aAuto, int32_t aZIndex)
 736 {
 737   bool oldIsAuto = GetZIndexIsAuto();
 738   mVFlags = (mVFlags & ~NS_VIEW_FLAG_AUTO_ZINDEX) | (aAuto ? NS_VIEW_FLAG_AUTO_ZINDEX : 0);
 739   mZIndex = aZIndex;
 740
 741   if (HasWidget() || !oldIsAuto || !aAuto) {
 742     UpdateNativeWidgetZIndexes(this, FindNonAutoZIndex(this));
 743   }
 744 }
 745
 746 void nsView::AssertNoWindow()
 747 {
 748   // XXX: it would be nice to make this a strong assert
 749   if (MOZ_UNLIKELY(mWindow)) {
 750     NS_ERROR("We already have a window for this view? BAD");
 751     mWindow->SetWidgetListener(nullptr);
 752     mWindow->Destroy();
 753     NS_RELEASE(mWindow);
 754   }
 755 }
 756
 757 //
 758 // internal window creation functions
 759 //
 760 void nsView::AttachWidgetEventHandler(nsIWidget* aWidget)
 761 {
 762 #ifdef DEBUG
 763   NS_ASSERTION(!aWidget->GetWidgetListener(), "Already have a widget listener");
 764 #endif
 765
 766   aWidget->SetWidgetListener(this);
 767 }
 768
 769 void nsView::DetachWidgetEventHandler(nsIWidget* aWidget)
 770 {
 771   NS_ASSERTION(!aWidget->GetWidgetListener() ||
 772                aWidget->GetWidgetListener()->GetView() == this, "Wrong view");
 773   aWidget->SetWidgetListener(nullptr);
 774 }
 775
 776 #ifdef DEBUG
 777 void nsView::List(FILE* out, int32_t aIndent) const
 778 {
 779   int32_t i;
 780   for (i = aIndent; --i >= 0; ) fputs("  ", out);
 781   fprintf(out, "%p ", (void*)this);
 782   if (nullptr != mWindow) {
 783     nscoord p2a = mViewManager->AppUnitsPerDevPixel();
 784     nsIntRect rect;
 785     mWindow->GetClientBounds(rect);
 786     nsRect windowBounds = rect.ToAppUnits(p2a);
 787     mWindow->GetBounds(rect);
 788     nsRect nonclientBounds = rect.ToAppUnits(p2a);
 789     nsrefcnt widgetRefCnt = mWindow->AddRef() - 1;
 790     mWindow->Release();
 791     int32_t Z = mWindow->GetZIndex();
 792     fprintf(out, "(widget=%p[%" PRIuPTR "] z=%d pos={%d,%d,%d,%d}) ",
 793             (void*)mWindow, widgetRefCnt, Z,
 794             nonclientBounds.x, nonclientBounds.y,
 795             windowBounds.width, windowBounds.height);
 796   }
 797   nsRect brect = GetBounds();
 798   fprintf(out, "{%d,%d,%d,%d}",
 799           brect.x, brect.y, brect.width, brect.height);
 800   fprintf(out, " z=%d vis=%d frame=%p <\n",
 801           mZIndex, mVis, static_cast<void*>(mFrame));
 802   for (nsView* kid = mFirstChild; kid; kid = kid->GetNextSibling()) {
 803     NS_ASSERTION(kid->GetParent() == this, "incorrect parent");
 804     kid->List(out, aIndent + 1);
 805   }
 806   for (i = aIndent; --i >= 0; ) fputs("  ", out);
 807   fputs(">\n", out);
 808 }
 809 #endif // DEBUG
 810
 811 nsPoint nsView::GetOffsetTo(const nsView* aOther) const
 812 {
 813   return GetOffsetTo(aOther, GetViewManager()->AppUnitsPerDevPixel());
 814 }
 815
 816 nsPoint nsView::GetOffsetTo(const nsView* aOther, const int32_t aAPD) const
 817 {
 818   NS_ABORT_IF_FALSE(GetParent() || !aOther || aOther->GetParent() ||
 819                     this == aOther, "caller of (outer) GetOffsetTo must not "
 820                     "pass unrelated views");
 821   // We accumulate the final result in offset
 822   nsPoint offset(0, 0);
 823   // The offset currently accumulated at the current APD
 824   nsPoint docOffset(0, 0);
 825   const nsView* v = this;
 826   nsViewManager* currVM = v->GetViewManager();
 827   int32_t currAPD = currVM->AppUnitsPerDevPixel();
 828   const nsView* root = nullptr;
 829   for ( ; v != aOther && v; root = v, v = v->GetParent()) {
 830     nsViewManager* newVM = v->GetViewManager();
 831     if (newVM != currVM) {
 832       int32_t newAPD = newVM->AppUnitsPerDevPixel();
 833       if (newAPD != currAPD) {
 834         offset += docOffset.ConvertAppUnits(currAPD, aAPD);
 835         docOffset.x = docOffset.y = 0;
 836         currAPD = newAPD;
 837       }
 838       currVM = newVM;
 839     }
 840     docOffset += v->GetPosition();
 841   }
 842   offset += docOffset.ConvertAppUnits(currAPD, aAPD);
 843
 844   if (v != aOther) {
 845     // Looks like aOther wasn't an ancestor of |this|.  So now we have
 846     // the root-VM-relative position of |this| in |offset|.  Get the
 847     // root-VM-relative position of aOther and subtract it.
 848     nsPoint negOffset = aOther->GetOffsetTo(root, aAPD);
 849     offset -= negOffset;
 850   }
 851
 852   return offset;
 853 }
 854
 855 nsPoint nsView::GetOffsetToWidget(nsIWidget* aWidget) const
 856 {
 857   nsPoint pt;
 858   // Get the view for widget
 859   nsView* widgetView = GetViewFor(aWidget);
 860   if (!widgetView) {
 861     return pt;
 862   }
 863
 864   // Get the offset to the widget view in the widget view's APD
 865   // We get the offset in the widget view's APD first and then convert to our
 866   // APD afterwards so that we can include the widget view's ViewToWidgetOffset
 867   // in the sum in its native APD, and then convert the whole thing to our APD
 868   // so that we don't have to convert the APD of the relatively small
 869   // ViewToWidgetOffset by itself with a potentially large relative rounding
 870   // error.
 871   pt = -widgetView->GetOffsetTo(this);
 872   // Add in the offset to the widget.
 873   pt += widgetView->ViewToWidgetOffset();
 874
 875   // Convert to our appunits.
 876   int32_t widgetAPD = widgetView->GetViewManager()->AppUnitsPerDevPixel();
 877   int32_t ourAPD = GetViewManager()->AppUnitsPerDevPixel();
 878   pt = pt.ConvertAppUnits(widgetAPD, ourAPD);
 879   return pt;
 880 }
 881
 882 nsIWidget* nsView::GetNearestWidget(nsPoint* aOffset) const
 883 {
 884   return GetNearestWidget(aOffset, GetViewManager()->AppUnitsPerDevPixel());
 885 }
 886
 887 nsIWidget* nsView::GetNearestWidget(nsPoint* aOffset, const int32_t aAPD) const
 888 {
 889   // aOffset is based on the view's position, which ignores any chrome on
 890   // attached parent widgets.
 891
 892   // We accumulate the final result in pt
 893   nsPoint pt(0, 0);
 894   // The offset currently accumulated at the current APD
 895   nsPoint docPt(0,0);
 896   const nsView* v = this;
 897   nsViewManager* currVM = v->GetViewManager();
 898   int32_t currAPD = currVM->AppUnitsPerDevPixel();
 899   for ( ; v && !v->HasWidget(); v = v->GetParent()) {
 900     nsViewManager* newVM = v->GetViewManager();
 901     if (newVM != currVM) {
 902       int32_t newAPD = newVM->AppUnitsPerDevPixel();
 903       if (newAPD != currAPD) {
 904         pt += docPt.ConvertAppUnits(currAPD, aAPD);
 905         docPt.x = docPt.y = 0;
 906         currAPD = newAPD;
 907       }
 908       currVM = newVM;
 909     }
 910     docPt += v->GetPosition();
 911   }
 912   if (!v) {
 913     if (aOffset) {
 914       pt += docPt.ConvertAppUnits(currAPD, aAPD);
 915       *aOffset = pt;
 916     }
 917     return nullptr;
 918   }
 919
 920   // pt is now the offset from v's origin to this view's origin.
 921   // We add the ViewToWidgetOffset to get the offset to the widget.
 922   if (aOffset) {
 923     docPt += v->ViewToWidgetOffset();
 924     pt += docPt.ConvertAppUnits(currAPD, aAPD);
 925     *aOffset = pt;
 926   }
 927   return v->GetWidget();
 928 }
 929
 930 bool nsView::IsRoot() const
 931 {
 932   NS_ASSERTION(mViewManager != nullptr," View manager is null in nsView::IsRoot()");
 933   return mViewManager->GetRootView() == this;
 934 }
 935
 936 nsRect
 937 nsView::GetBoundsInParentUnits() const
 938 {
 939   nsView* parent = GetParent();
 940   nsViewManager* VM = GetViewManager();
 941   if (this != VM->GetRootView() || !parent) {
 942     return mDimBounds;
 943   }
 944   int32_t ourAPD = VM->AppUnitsPerDevPixel();
 945   int32_t parentAPD = parent->GetViewManager()->AppUnitsPerDevPixel();
 946   return mDimBounds.ConvertAppUnitsRoundOut(ourAPD, parentAPD);
 947 }
 948
 949 nsPoint
 950 nsView::ConvertFromParentCoords(nsPoint aPt) const
 951 {
 952   const nsView* parent = GetParent();
 953   if (parent) {
 954     aPt = aPt.ConvertAppUnits(parent->GetViewManager()->AppUnitsPerDevPixel(),
 955                               GetViewManager()->AppUnitsPerDevPixel());
 956   }
 957   aPt -= GetPosition();
 958   return aPt;
 959 }
 960
 961 static bool
 962 IsPopupWidget(nsIWidget* aWidget)
 963 {
 964   return (aWidget->WindowType() == eWindowType_popup);
 965 }
 966
 967 nsIPresShell*
 968 nsView::GetPresShell()
 969 {
 970   return GetViewManager()->GetPresShell();
 971 }
 972
 973 bool
 974 nsView::WindowMoved(nsIWidget* aWidget, int32_t x, int32_t y)
 975 {
 976   nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
 977   if (pm && IsPopupWidget(aWidget)) {
 978     pm->PopupMoved(mFrame, nsIntPoint(x, y));
 979     return true;
 980   }
 981
 982   return false;
 983 }
 984
 985 bool
 986 nsView::WindowResized(nsIWidget* aWidget, int32_t aWidth, int32_t aHeight)
 987 {
 988   // The root view may not be set if this is the resize associated with
 989   // window creation
 990   SetForcedRepaint(true);
 991   if (this == mViewManager->GetRootView()) {
 992     nsRefPtr<nsDeviceContext> devContext = mViewManager->GetDeviceContext();
 993     // ensure DPI is up-to-date, in case of window being opened and sized
 994     // on a non-default-dpi display (bug 829963)
 995     devContext->CheckDPIChange();
 996     int32_t p2a = devContext->AppUnitsPerDevPixel();
 997     mViewManager->SetWindowDimensions(NSIntPixelsToAppUnits(aWidth, p2a),
 998                                       NSIntPixelsToAppUnits(aHeight, p2a));
 999
1000     nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
1001     if (pm) {
1002       nsIPresShell* presShell = mViewManager->GetPresShell();
1003       if (presShell && presShell->GetDocument()) {
1004         pm->AdjustPopupsOnWindowChange(presShell);
1005       }
1006     }
1007
1008     return true;
1009   }
1010   else if (IsPopupWidget(aWidget)) {
1011     nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
1012     if (pm) {
1013       pm->PopupResized(mFrame, nsIntSize(aWidth, aHeight));
1014       return true;
1015     }
1016   }
1017
1018   return false;
1019 }
1020
1021 bool
1022 nsView::RequestWindowClose(nsIWidget* aWidget)
1023 {
1024   if (mFrame && IsPopupWidget(aWidget) &&
1025       mFrame->GetType() == nsGkAtoms::menuPopupFrame) {
1026     nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
1027     if (pm) {
1028       pm->HidePopup(mFrame->GetContent(), false, true, false, false);
1029       return true;
1030     }
1031   }
1032
1033   return false;
1034 }
1035
1036 void
1037 nsView::WillPaintWindow(nsIWidget* aWidget)
1038 {
1039   nsRefPtr<nsViewManager> vm = mViewManager;
1040   vm->WillPaintWindow(aWidget);
1041 }
1042
1043 bool
1044 nsView::PaintWindow(nsIWidget* aWidget, nsIntRegion aRegion)
1045 {
1046   NS_ASSERTION(this == nsView::GetViewFor(aWidget), "wrong view for widget?");
1047
1048   nsRefPtr<nsViewManager> vm = mViewManager;
1049   bool result = vm->PaintWindow(aWidget, aRegion);
1050   return result;
1051 }
1052
1053 void
1054 nsView::DidPaintWindow()
1055 {
1056   nsRefPtr<nsViewManager> vm = mViewManager;
1057   vm->DidPaintWindow();
1058 }
1059
1060 void
1061 nsView::DidCompositeWindow()
1062 {
1063   nsIPresShell* presShell = mViewManager->GetPresShell();
1064   if (presShell) {
1065     nsAutoScriptBlocker scriptBlocker;
1066     presShell->GetPresContext()->GetDisplayRootPresContext()->GetRootPresContext()->NotifyDidPaintForSubtree(nsIPresShell::PAINT_COMPOSITE);
1067   }
1068 }
1069
1070 void
1071 nsView::RequestRepaint()
1072 {
1073   nsIPresShell* presShell = mViewManager->GetPresShell();
1074   if (presShell) {
1075     presShell->ScheduleViewManagerFlush();
1076   }
1077 }
1078
1079 nsEventStatus
1080 nsView::HandleEvent(WidgetGUIEvent* aEvent,
1081                     bool aUseAttachedEvents)
1082 {
1083   NS_PRECONDITION(nullptr != aEvent->widget, "null widget ptr");
1084
1085   nsEventStatus result = nsEventStatus_eIgnore;
1086   nsView* view;
1087   if (aUseAttachedEvents) {
1088     nsIWidgetListener* listener = aEvent->widget->GetAttachedWidgetListener();
1089     view = listener ? listener->GetView() : nullptr;
1090   }
1091   else {
1092     view = GetViewFor(aEvent->widget);
1093   }
1094
1095   if (view) {
1096     nsRefPtr<nsViewManager> vm = view->GetViewManager();
1097     vm->DispatchEvent(aEvent, view, &result);
1098   }
1099
1100   return result;
1101 }