layout/generic/WBRFrame.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* rendering object for HTML <wbr> elements */
   8
   9 #include "nsIFrame.h"
  10
  11 using namespace mozilla;
  12
  13 namespace mozilla {
  14
  15 class WBRFrame final : public nsIFrame {
  16  public:
  17   NS_DECL_FRAMEARENA_HELPERS(WBRFrame)
  18
  19   friend nsIFrame* ::NS_NewWBRFrame(mozilla::PresShell* aPresShell,
  20                                     ComputedStyle* aStyle);
  21
  22   virtual FrameSearchResult PeekOffsetNoAmount(bool aForward,
  23                                                int32_t* aOffset) override;
  24   virtual FrameSearchResult PeekOffsetCharacter(
  25       bool aForward, int32_t* aOffset,
  26       PeekOffsetCharacterOptions aOptions =
  27           PeekOffsetCharacterOptions()) override;
  28   virtual FrameSearchResult PeekOffsetWord(
  29       bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
  30       int32_t* aOffset, PeekWordState* aState, bool aTrimSpaces) override;
  31
  32  protected:
  33   explicit WBRFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  34       : nsIFrame(aStyle, aPresContext, kClassID) {}
  35 };
  36
  37 }  // namespace mozilla
  38
  39 nsIFrame* NS_NewWBRFrame(mozilla::PresShell* aPresShell,
  40                          ComputedStyle* aStyle) {
  41   return new (aPresShell) WBRFrame(aStyle, aPresShell->GetPresContext());
  42 }
  43
  44 NS_IMPL_FRAMEARENA_HELPERS(WBRFrame)
  45
  46 nsIFrame::FrameSearchResult WBRFrame::PeekOffsetNoAmount(bool aForward,
  47                                                          int32_t* aOffset) {
  48   NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
  49   // WBR frames can not contain text or non-rendered whitespace
  50   return CONTINUE;
  51 }
  52
  53 nsIFrame::FrameSearchResult WBRFrame::PeekOffsetCharacter(
  54     bool aForward, int32_t* aOffset, PeekOffsetCharacterOptions aOptions) {
  55   NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
  56   // WBR frames can not contain characters
  57   return CONTINUE;
  58 }
  59
  60 nsIFrame::FrameSearchResult WBRFrame::PeekOffsetWord(
  61     bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
  62     int32_t* aOffset, PeekWordState* aState, bool aTrimSpaces) {
  63   NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
  64   // WBR frames can never contain text so we'll never find a word inside them
  65   return CONTINUE;
  66 }