dom/ipc/TabContext.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 #include "mozilla/dom/TabContext.h"
   8 #include "mozilla/dom/PTabContext.h"
   9 #include "mozilla/dom/BrowserParent.h"
  10 #include "mozilla/dom/BrowserChild.h"
  11 #include "mozilla/StaticPrefs_dom.h"
  12 #include "nsServiceManagerUtils.h"
  13
  14 using namespace mozilla::dom::ipc;
  15 using namespace mozilla::layout;
  16
  17 namespace mozilla::dom {
  18
  19 TabContext::TabContext()
  20     : mInitialized(false),
  21       mChromeOuterWindowID(0),
  22       mMaxTouchPoints(0) {}
  23
  24 uint64_t TabContext::ChromeOuterWindowID() const {
  25   return mChromeOuterWindowID;
  26 }
  27
  28 bool TabContext::SetTabContext(const TabContext& aContext) {
  29   NS_ENSURE_FALSE(mInitialized, false);
  30
  31   *this = aContext;
  32   mInitialized = true;
  33
  34   return true;
  35 }
  36
  37 bool TabContext::UpdateTabContextAfterSwap(const TabContext& aContext) {
  38   // This is only used after already initialized.
  39   MOZ_ASSERT(mInitialized);
  40
  41   // The only permissable changes are to mChromeOuterWindowID.  All other fields
  42   // must match for the change to be accepted.
  43
  44   mChromeOuterWindowID = aContext.mChromeOuterWindowID;
  45   return true;
  46 }
  47
  48 bool TabContext::SetTabContext(uint64_t aChromeOuterWindowID,
  49                                uint32_t aMaxTouchPoints) {
  50   NS_ENSURE_FALSE(mInitialized, false);
  51
  52   mInitialized = true;
  53   mChromeOuterWindowID = aChromeOuterWindowID;
  54   mMaxTouchPoints = aMaxTouchPoints;
  55   return true;
  56 }
  57
  58 IPCTabContext TabContext::AsIPCTabContext() const {
  59   return IPCTabContext(
  60       FrameIPCTabContext(mChromeOuterWindowID, mMaxTouchPoints));
  61 }
  62
  63 MaybeInvalidTabContext::MaybeInvalidTabContext(const IPCTabContext& aParams)
  64     : mInvalidReason(nullptr) {
  65   uint64_t chromeOuterWindowID = 0;
  66   uint32_t maxTouchPoints = 0;
  67
  68   switch (aParams.type()) {
  69     case IPCTabContext::TPopupIPCTabContext: {
  70       const PopupIPCTabContext& ipcContext = aParams.get_PopupIPCTabContext();
  71
  72       chromeOuterWindowID = ipcContext.chromeOuterWindowID();
  73       break;
  74     }
  75     case IPCTabContext::TFrameIPCTabContext: {
  76       const FrameIPCTabContext& ipcContext = aParams.get_FrameIPCTabContext();
  77
  78       chromeOuterWindowID = ipcContext.chromeOuterWindowID();
  79       maxTouchPoints = ipcContext.maxTouchPoints();
  80       break;
  81     }
  82     default: {
  83       MOZ_CRASH();
  84     }
  85   }
  86
  87   if (!mTabContext.SetTabContext(chromeOuterWindowID, maxTouchPoints)) {
  88     mInvalidReason = "Couldn't initialize TabContext.";
  89   }
  90 }
  91
  92 bool MaybeInvalidTabContext::IsValid() { return mInvalidReason == nullptr; }
  93
  94 const char* MaybeInvalidTabContext::GetInvalidReason() {
  95   return mInvalidReason;
  96 }
  97
  98 const TabContext& MaybeInvalidTabContext::GetTabContext() {
  99   if (!IsValid()) {
 100     MOZ_CRASH("Can't GetTabContext() if !IsValid().");
 101   }
 102
 103   return mTabContext;
 104 }
 105
 106 }  // namespace mozilla::dom