widget/nsNativeTheme.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 "nsNativeTheme.h"
   7 #include "nsIWidget.h"
   8 #include "mozilla/dom/Document.h"
   9 #include "nsIContent.h"
  10 #include "nsIFrame.h"
  11 #include "nsIScrollableFrame.h"
  12 #include "nsLayoutUtils.h"
  13 #include "nsNumberControlFrame.h"
  14 #include "nsPresContext.h"
  15 #include "nsString.h"
  16 #include "nsNameSpaceManager.h"
  17 #include "nsStyleConsts.h"
  18 #include "nsPIDOMWindow.h"
  19 #include "nsProgressFrame.h"
  20 #include "nsMeterFrame.h"
  21 #include "nsRangeFrame.h"
  22 #include "nsCSSRendering.h"
  23 #include "ImageContainer.h"
  24 #include "mozilla/ComputedStyle.h"
  25 #include "mozilla/dom/Element.h"
  26 #include "mozilla/dom/HTMLBodyElement.h"
  27 #include "mozilla/dom/HTMLInputElement.h"
  28 #include "mozilla/dom/HTMLProgressElement.h"
  29 #include "mozilla/PresShell.h"
  30 #include "mozilla/StaticPrefs_layout.h"
  31 #include "mozilla/dom/DocumentInlines.h"
  32 #include <algorithm>
  33
  34 using namespace mozilla;
  35 using namespace mozilla::dom;
  36
  37 nsNativeTheme::nsNativeTheme() : mAnimatedContentTimeout(UINT32_MAX) {}
  38
  39 NS_IMPL_ISUPPORTS(nsNativeTheme, nsITimerCallback, nsINamed)
  40
  41 /* static */ ElementState nsNativeTheme::GetContentState(
  42     nsIFrame* aFrame, StyleAppearance aAppearance) {
  43   if (!aFrame) {
  44     return ElementState();
  45   }
  46
  47   nsIContent* frameContent = aFrame->GetContent();
  48   if (!frameContent || !frameContent->IsElement()) {
  49     return ElementState();
  50   }
  51
  52   const bool isXULElement = frameContent->IsXULElement();
  53   if (isXULElement) {
  54     if (aAppearance == StyleAppearance::Checkbox ||
  55         aAppearance == StyleAppearance::Radio ||
  56         aAppearance == StyleAppearance::ToolbarbuttonDropdown ||
  57         aAppearance == StyleAppearance::Treeheadersortarrow ||
  58         aAppearance == StyleAppearance::ButtonArrowPrevious ||
  59         aAppearance == StyleAppearance::ButtonArrowNext ||
  60         aAppearance == StyleAppearance::ButtonArrowUp ||
  61         aAppearance == StyleAppearance::ButtonArrowDown) {
  62       aFrame = aFrame->GetParent();
  63       frameContent = aFrame->GetContent();
  64     }
  65     MOZ_ASSERT(frameContent && frameContent->IsElement());
  66   }
  67
  68   ElementState flags = frameContent->AsElement()->StyleState();
  69   nsNumberControlFrame* numberControlFrame =
  70       nsNumberControlFrame::GetNumberControlFrameForSpinButton(aFrame);
  71   if (numberControlFrame &&
  72       numberControlFrame->GetContent()->AsElement()->StyleState().HasState(
  73           ElementState::DISABLED)) {
  74     flags |= ElementState::DISABLED;
  75   }
  76
  77   if (!isXULElement) {
  78     return flags;
  79   }
  80
  81   if (CheckBooleanAttr(aFrame, nsGkAtoms::disabled)) {
  82     flags |= ElementState::DISABLED;
  83   }
  84
  85   switch (aAppearance) {
  86     case StyleAppearance::Radio: {
  87       if (CheckBooleanAttr(aFrame, nsGkAtoms::focused)) {
  88         flags |= ElementState::FOCUS;
  89         nsPIDOMWindowOuter* window =
  90             aFrame->GetContent()->OwnerDoc()->GetWindow();
  91         if (window && window->ShouldShowFocusRing()) {
  92           flags |= ElementState::FOCUSRING;
  93         }
  94       }
  95       if (CheckBooleanAttr(aFrame, nsGkAtoms::selected) ||
  96           CheckBooleanAttr(aFrame, nsGkAtoms::checked)) {
  97         flags |= ElementState::CHECKED;
  98       }
  99       break;
 100     }
 101     case StyleAppearance::Checkbox: {
 102       if (CheckBooleanAttr(aFrame, nsGkAtoms::checked)) {
 103         flags |= ElementState::CHECKED;
 104       } else if (CheckBooleanAttr(aFrame, nsGkAtoms::indeterminate)) {
 105         flags |= ElementState::INDETERMINATE;
 106       }
 107       break;
 108     }
 109     case StyleAppearance::MenulistButton:
 110     case StyleAppearance::Menulist:
 111     case StyleAppearance::NumberInput:
 112     case StyleAppearance::Textfield:
 113     case StyleAppearance::Searchfield:
 114     case StyleAppearance::Textarea: {
 115       if (CheckBooleanAttr(aFrame, nsGkAtoms::focused)) {
 116         flags |= ElementState::FOCUS | ElementState::FOCUSRING;
 117       }
 118       break;
 119     }
 120     default:
 121       break;
 122   }
 123
 124   return flags;
 125 }
 126
 127 /* static */
 128 bool nsNativeTheme::CheckBooleanAttr(nsIFrame* aFrame, nsAtom* aAtom) {
 129   if (!aFrame) return false;
 130
 131   nsIContent* content = aFrame->GetContent();
 132   if (!content || !content->IsElement()) return false;
 133
 134   if (content->IsHTMLElement()) return content->AsElement()->HasAttr(aAtom);
 135
 136   // For XML/XUL elements, an attribute must be equal to the literal
 137   // string "true" to be counted as true.  An empty string should _not_
 138   // be counted as true.
 139   return content->AsElement()->AttrValueIs(kNameSpaceID_None, aAtom, u"true"_ns,
 140                                            eCaseMatters);
 141 }
 142
 143 /* static */
 144 int32_t nsNativeTheme::CheckIntAttr(nsIFrame* aFrame, nsAtom* aAtom,
 145                                     int32_t defaultValue) {
 146   if (!aFrame) return defaultValue;
 147
 148   nsIContent* content = aFrame->GetContent();
 149   if (!content || !content->IsElement()) return defaultValue;
 150
 151   nsAutoString attr;
 152   content->AsElement()->GetAttr(aAtom, attr);
 153   nsresult err;
 154   int32_t value = attr.ToInteger(&err);
 155   if (attr.IsEmpty() || NS_FAILED(err)) return defaultValue;
 156
 157   return value;
 158 }
 159
 160 /* static */
 161 double nsNativeTheme::GetProgressValue(nsIFrame* aFrame) {
 162   if (!aFrame || !aFrame->GetContent()->IsHTMLElement(nsGkAtoms::progress)) {
 163     return 0;
 164   }
 165
 166   return static_cast<HTMLProgressElement*>(aFrame->GetContent())->Value();
 167 }
 168
 169 /* static */
 170 double nsNativeTheme::GetProgressMaxValue(nsIFrame* aFrame) {
 171   if (!aFrame || !aFrame->GetContent()->IsHTMLElement(nsGkAtoms::progress)) {
 172     return 100;
 173   }
 174
 175   return static_cast<HTMLProgressElement*>(aFrame->GetContent())->Max();
 176 }
 177
 178 bool nsNativeTheme::IsButtonTypeMenu(nsIFrame* aFrame) {
 179   if (!aFrame) return false;
 180
 181   nsIContent* content = aFrame->GetContent();
 182   return content->IsXULElement(nsGkAtoms::button) &&
 183          content->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
 184                                            u"menu"_ns, eCaseMatters);
 185 }
 186
 187 bool nsNativeTheme::IsPressedButton(nsIFrame* aFrame) {
 188   ElementState state = GetContentState(aFrame, StyleAppearance::Toolbarbutton);
 189   if (state.HasState(ElementState::DISABLED)) {
 190     return false;
 191   }
 192
 193   return IsOpenButton(aFrame) ||
 194          state.HasAllStates(ElementState::ACTIVE | ElementState::HOVER);
 195 }
 196
 197 bool nsNativeTheme::IsWidgetStyled(nsPresContext* aPresContext,
 198                                    nsIFrame* aFrame,
 199                                    StyleAppearance aAppearance) {
 200   // Check for specific widgets to see if HTML has overridden the style.
 201   if (!aFrame) {
 202     return false;
 203   }
 204
 205   /**
 206    * Progress bar appearance should be the same for the bar and the container
 207    * frame. nsProgressFrame owns the logic and will tell us what we should do.
 208    */
 209   if (aAppearance == StyleAppearance::Progresschunk ||
 210       aAppearance == StyleAppearance::ProgressBar) {
 211     nsProgressFrame* progressFrame = do_QueryFrame(
 212         aAppearance == StyleAppearance::Progresschunk ? aFrame->GetParent()
 213                                                       : aFrame);
 214     if (progressFrame) {
 215       return !progressFrame->ShouldUseNativeStyle();
 216     }
 217   }
 218
 219   /**
 220    * Meter bar appearance should be the same for the bar and the container
 221    * frame. nsMeterFrame owns the logic and will tell us what we should do.
 222    */
 223   if (aAppearance == StyleAppearance::Meterchunk ||
 224       aAppearance == StyleAppearance::Meter) {
 225     nsMeterFrame* meterFrame = do_QueryFrame(
 226         aAppearance == StyleAppearance::Meterchunk ? aFrame->GetParent()
 227                                                    : aFrame);
 228     if (meterFrame) {
 229       return !meterFrame->ShouldUseNativeStyle();
 230     }
 231   }
 232
 233   /**
 234    * An nsRangeFrame and its children are treated atomically when it
 235    * comes to native theming (either all parts, or no parts, are themed).
 236    * nsRangeFrame owns the logic and will tell us what we should do.
 237    */
 238   if (aAppearance == StyleAppearance::Range ||
 239       aAppearance == StyleAppearance::RangeThumb) {
 240     nsRangeFrame* rangeFrame = do_QueryFrame(
 241         aAppearance == StyleAppearance::RangeThumb ? aFrame->GetParent()
 242                                                    : aFrame);
 243     if (rangeFrame) {
 244       return !rangeFrame->ShouldUseNativeStyle();
 245     }
 246   }
 247
 248   return nsLayoutUtils::AuthorSpecifiedBorderBackgroundDisablesTheming(
 249              aAppearance) &&
 250          aFrame->GetContent()->IsHTMLElement() &&
 251          aFrame->Style()->HasAuthorSpecifiedBorderOrBackground();
 252 }
 253
 254 /* static */
 255 bool nsNativeTheme::IsFrameRTL(nsIFrame* aFrame) {
 256   if (!aFrame) {
 257     return false;
 258   }
 259   return aFrame->GetWritingMode().IsPhysicalRTL();
 260 }
 261
 262 /* static */
 263 bool nsNativeTheme::IsHTMLContent(nsIFrame* aFrame) {
 264   if (!aFrame) {
 265     return false;
 266   }
 267   nsIContent* content = aFrame->GetContent();
 268   return content && content->IsHTMLElement();
 269 }
 270
 271 // treeheadercell:
 272 nsNativeTheme::TreeSortDirection nsNativeTheme::GetTreeSortDirection(
 273     nsIFrame* aFrame) {
 274   if (!aFrame || !aFrame->GetContent()) return eTreeSortDirection_Natural;
 275
 276   static Element::AttrValuesArray strings[] = {nsGkAtoms::descending,
 277                                                nsGkAtoms::ascending, nullptr};
 278
 279   nsIContent* content = aFrame->GetContent();
 280   if (content->IsElement()) {
 281     switch (content->AsElement()->FindAttrValueIn(
 282         kNameSpaceID_None, nsGkAtoms::sortDirection, strings, eCaseMatters)) {
 283       case 0:
 284         return eTreeSortDirection_Descending;
 285       case 1:
 286         return eTreeSortDirection_Ascending;
 287     }
 288   }
 289
 290   return eTreeSortDirection_Natural;
 291 }
 292
 293 bool nsNativeTheme::IsLastTreeHeaderCell(nsIFrame* aFrame) {
 294   if (!aFrame) {
 295     return false;
 296   }
 297
 298   // A tree column picker button is always the last header cell.
 299   if (aFrame->GetContent()->IsXULElement(nsGkAtoms::button)) {
 300     return true;
 301   }
 302
 303   // Find the parent tree.
 304   nsIContent* parent = aFrame->GetContent()->GetParent();
 305   while (parent && !parent->IsXULElement(nsGkAtoms::tree)) {
 306     parent = parent->GetParent();
 307   }
 308
 309   // If the column picker is visible, this can't be the last column.
 310   if (parent && !parent->AsElement()->AttrValueIs(kNameSpaceID_None,
 311                                                   nsGkAtoms::hidecolumnpicker,
 312                                                   u"true"_ns, eCaseMatters))
 313     return false;
 314
 315   while ((aFrame = aFrame->GetNextSibling())) {
 316     if (aFrame->GetRect().Width() > 0) return false;
 317   }
 318   return true;
 319 }
 320
 321 // tab:
 322 bool nsNativeTheme::IsBottomTab(nsIFrame* aFrame) {
 323   if (!aFrame) return false;
 324
 325   nsAutoString classStr;
 326   if (aFrame->GetContent()->IsElement()) {
 327     aFrame->GetContent()->AsElement()->GetAttr(nsGkAtoms::_class, classStr);
 328   }
 329   // FIXME: This looks bogus, shouldn't this be looking at GetClasses()?
 330   return !classStr.IsEmpty() && classStr.Find(u"tab-bottom") != kNotFound;
 331 }
 332
 333 bool nsNativeTheme::IsFirstTab(nsIFrame* aFrame) {
 334   if (!aFrame) return false;
 335
 336   for (nsIFrame* first : aFrame->GetParent()->PrincipalChildList()) {
 337     if (first->GetRect().Width() > 0 &&
 338         first->GetContent()->IsXULElement(nsGkAtoms::tab))
 339       return (first == aFrame);
 340   }
 341   return false;
 342 }
 343
 344 bool nsNativeTheme::IsHorizontal(nsIFrame* aFrame) {
 345   if (!aFrame) return false;
 346
 347   if (!aFrame->GetContent()->IsElement()) return true;
 348
 349   return !aFrame->GetContent()->AsElement()->AttrValueIs(
 350       kNameSpaceID_None, nsGkAtoms::orient, nsGkAtoms::vertical, eCaseMatters);
 351 }
 352
 353 bool nsNativeTheme::IsNextToSelectedTab(nsIFrame* aFrame, int32_t aOffset) {
 354   if (!aFrame) return false;
 355
 356   if (aOffset == 0) return IsSelectedTab(aFrame);
 357
 358   int32_t thisTabIndex = -1, selectedTabIndex = -1;
 359
 360   nsIFrame* currentTab = aFrame->GetParent()->PrincipalChildList().FirstChild();
 361   for (int32_t i = 0; currentTab; currentTab = currentTab->GetNextSibling()) {
 362     if (currentTab->GetRect().Width() == 0) continue;
 363     if (aFrame == currentTab) thisTabIndex = i;
 364     if (IsSelectedTab(currentTab)) selectedTabIndex = i;
 365     ++i;
 366   }
 367
 368   if (thisTabIndex == -1 || selectedTabIndex == -1) return false;
 369
 370   return (thisTabIndex - selectedTabIndex == aOffset);
 371 }
 372
 373 bool nsNativeTheme::IsVerticalProgress(nsIFrame* aFrame) {
 374   if (!aFrame) {
 375     return false;
 376   }
 377   return IsVerticalMeter(aFrame);
 378 }
 379
 380 bool nsNativeTheme::IsVerticalMeter(nsIFrame* aFrame) {
 381   MOZ_ASSERT(aFrame, "You have to pass a non-null aFrame");
 382   switch (aFrame->StyleDisplay()->mOrient) {
 383     case StyleOrient::Horizontal:
 384       return false;
 385     case StyleOrient::Vertical:
 386       return true;
 387     case StyleOrient::Inline:
 388       return aFrame->GetWritingMode().IsVertical();
 389     case StyleOrient::Block:
 390       return !aFrame->GetWritingMode().IsVertical();
 391   }
 392   MOZ_ASSERT_UNREACHABLE("unexpected -moz-orient value");
 393   return false;
 394 }
 395
 396 // menupopup:
 397 bool nsNativeTheme::IsSubmenu(nsIFrame* aFrame, bool* aLeftOfParent) {
 398   if (!aFrame) return false;
 399
 400   nsIContent* parentContent = aFrame->GetContent()->GetParent();
 401   if (!parentContent || !parentContent->IsXULElement(nsGkAtoms::menu))
 402     return false;
 403
 404   nsIFrame* parent = aFrame;
 405   while ((parent = parent->GetParent())) {
 406     if (parent->GetContent() == parentContent) {
 407       if (aLeftOfParent) {
 408         LayoutDeviceIntRect selfBounds, parentBounds;
 409         selfBounds = aFrame->GetNearestWidget()->GetScreenBounds();
 410         parentBounds = parent->GetNearestWidget()->GetScreenBounds();
 411         *aLeftOfParent = selfBounds.X() < parentBounds.X();
 412       }
 413       return true;
 414     }
 415   }
 416
 417   return false;
 418 }
 419
 420 bool nsNativeTheme::QueueAnimatedContentForRefresh(nsIContent* aContent,
 421                                                    uint32_t aMinimumFrameRate) {
 422   NS_ASSERTION(aContent, "Null pointer!");
 423   NS_ASSERTION(aMinimumFrameRate, "aMinimumFrameRate must be non-zero!");
 424   NS_ASSERTION(aMinimumFrameRate <= 1000,
 425                "aMinimumFrameRate must be less than 1000!");
 426
 427   uint32_t timeout = 1000 / aMinimumFrameRate;
 428   timeout = std::min(mAnimatedContentTimeout, timeout);
 429
 430   if (!mAnimatedContentTimer) {
 431     mAnimatedContentTimer = NS_NewTimer();
 432     NS_ENSURE_TRUE(mAnimatedContentTimer, false);
 433   }
 434
 435   if (mAnimatedContentList.IsEmpty() || timeout != mAnimatedContentTimeout) {
 436     nsresult rv;
 437     if (!mAnimatedContentList.IsEmpty()) {
 438       rv = mAnimatedContentTimer->Cancel();
 439       NS_ENSURE_SUCCESS(rv, false);
 440     }
 441
 442     if (XRE_IsContentProcess() && NS_IsMainThread()) {
 443       mAnimatedContentTimer->SetTarget(GetMainThreadSerialEventTarget());
 444     }
 445     rv = mAnimatedContentTimer->InitWithCallback(this, timeout,
 446                                                  nsITimer::TYPE_ONE_SHOT);
 447     NS_ENSURE_SUCCESS(rv, false);
 448
 449     mAnimatedContentTimeout = timeout;
 450   }
 451
 452   // XXX(Bug 1631371) Check if this should use a fallible operation as it
 453   // pretended earlier.
 454   mAnimatedContentList.AppendElement(aContent);
 455
 456   return true;
 457 }
 458
 459 NS_IMETHODIMP
 460 nsNativeTheme::Notify(nsITimer* aTimer) {
 461   NS_ASSERTION(aTimer == mAnimatedContentTimer, "Wrong timer!");
 462
 463   // XXX Assumes that calling nsIFrame::Invalidate won't reenter
 464   //     QueueAnimatedContentForRefresh.
 465
 466   uint32_t count = mAnimatedContentList.Length();
 467   for (uint32_t index = 0; index < count; index++) {
 468     nsIFrame* frame = mAnimatedContentList[index]->GetPrimaryFrame();
 469     if (frame) {
 470       frame->InvalidateFrame();
 471     }
 472   }
 473
 474   mAnimatedContentList.Clear();
 475   mAnimatedContentTimeout = UINT32_MAX;
 476   return NS_OK;
 477 }
 478
 479 NS_IMETHODIMP
 480 nsNativeTheme::GetName(nsACString& aName) {
 481   aName.AssignLiteral("nsNativeTheme");
 482   return NS_OK;
 483 }
 484
 485 nsIFrame* nsNativeTheme::GetAdjacentSiblingFrameWithSameAppearance(
 486     nsIFrame* aFrame, bool aNextSibling) {
 487   if (!aFrame) return nullptr;
 488
 489   // Find the next visible sibling.
 490   nsIFrame* sibling = aFrame;
 491   do {
 492     sibling =
 493         aNextSibling ? sibling->GetNextSibling() : sibling->GetPrevSibling();
 494   } while (sibling && sibling->GetRect().Width() == 0);
 495
 496   // Check same appearance and adjacency.
 497   if (!sibling ||
 498       sibling->StyleDisplay()->EffectiveAppearance() !=
 499           aFrame->StyleDisplay()->EffectiveAppearance() ||
 500       (sibling->GetRect().XMost() != aFrame->GetRect().X() &&
 501        aFrame->GetRect().XMost() != sibling->GetRect().X()))
 502     return nullptr;
 503   return sibling;
 504 }
 505
 506 bool nsNativeTheme::IsRangeHorizontal(nsIFrame* aFrame) {
 507   nsIFrame* rangeFrame = aFrame;
 508   if (!rangeFrame->IsRangeFrame()) {
 509     // If the thumb's frame is passed in, get its range parent:
 510     rangeFrame = aFrame->GetParent();
 511   }
 512   if (rangeFrame->IsRangeFrame()) {
 513     return static_cast<nsRangeFrame*>(rangeFrame)->IsHorizontal();
 514   }
 515   // Not actually a range frame - just use the ratio of the frame's size to
 516   // decide:
 517   return aFrame->GetSize().width >= aFrame->GetSize().height;
 518 }
 519
 520 /* static */
 521 bool nsNativeTheme::IsDarkBackgroundForScrollbar(nsIFrame* aFrame) {
 522   // Try to find the scrolled frame. Note that for stuff like xul <tree> there
 523   // might be none.
 524   {
 525     nsIFrame* frame = aFrame;
 526     nsIScrollableFrame* scrollFrame = nullptr;
 527     while (!scrollFrame && frame) {
 528       scrollFrame = frame->GetScrollTargetFrame();
 529       frame = frame->GetParent();
 530     }
 531     if (scrollFrame) {
 532       aFrame = scrollFrame->GetScrolledFrame();
 533     } else {
 534       // Leave aFrame untouched.
 535     }
 536   }
 537
 538   return IsDarkBackground(aFrame);
 539 }
 540
 541 /* static */
 542 bool nsNativeTheme::IsDarkBackground(nsIFrame* aFrame) {
 543   auto color =
 544       nsCSSRendering::FindEffectiveBackgroundColor(
 545           aFrame, /* aStopAtThemed = */ false, /* aPreferBodyToCanvas = */ true)
 546           .mColor;
 547   return LookAndFeel::IsDarkColor(color);
 548 }
 549
 550 /*static*/
 551 bool nsNativeTheme::IsWidgetScrollbarPart(StyleAppearance aAppearance) {
 552   switch (aAppearance) {
 553     case StyleAppearance::ScrollbarVertical:
 554     case StyleAppearance::ScrollbarHorizontal:
 555     case StyleAppearance::ScrollbarbuttonUp:
 556     case StyleAppearance::ScrollbarbuttonDown:
 557     case StyleAppearance::ScrollbarbuttonLeft:
 558     case StyleAppearance::ScrollbarbuttonRight:
 559     case StyleAppearance::ScrollbarthumbVertical:
 560     case StyleAppearance::ScrollbarthumbHorizontal:
 561     case StyleAppearance::ScrollbartrackHorizontal:
 562     case StyleAppearance::ScrollbartrackVertical:
 563     case StyleAppearance::Scrollcorner:
 564       return true;
 565     default:
 566       return false;
 567   }
 568 }
 569
 570 /*static*/
 571 bool nsNativeTheme::IsWidgetAlwaysNonNative(nsIFrame* aFrame,
 572                                             StyleAppearance aAppearance) {
 573   return IsWidgetScrollbarPart(aAppearance) ||
 574          aAppearance == StyleAppearance::FocusOutline ||
 575          (aFrame && aFrame->StyleUI()->mMozTheme == StyleMozTheme::NonNative);
 576 }