The Tor Browser / file comparison
comparison: gfx/layers/apz/util/ActiveElementManager.cpp
gfx/layers/apz/util/ActiveElementManager.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:009ed37c67de |
|---|---|
| 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 "ActiveElementManager.h" | |
| 7 #include "mozilla/EventStates.h" | |
| 8 #include "mozilla/Preferences.h" | |
| 9 #include "mozilla/Services.h" | |
| 10 #include "inIDOMUtils.h" | |
| 11 #include "nsIDOMDocument.h" | |
| 12 #include "nsIDOMElement.h" | |
| 13 #include "nsIDOMEventTarget.h" | |
| 14 #include "base/message_loop.h" | |
| 15 #include "base/task.h" | |
| 16 | |
| 17 namespace mozilla { | |
| 18 namespace layers { | |
| 19 | |
| 20 static int32_t sActivationDelayMs = 100; | |
| 21 static bool sActivationDelayMsSet = false; | |
| 22 | |
| 23 ActiveElementManager::ActiveElementManager() | |
| 24 : mDomUtils(services::GetInDOMUtils()), | |
| 25 mCanBePan(false), | |
| 26 mCanBePanSet(false), | |
| 27 mSetActiveTask(nullptr) | |
| 28 { | |
| 29 if (!sActivationDelayMsSet) { | |
| 30 Preferences::AddIntVarCache(&sActivationDelayMs, | |
| 31 "ui.touch_activation.delay_ms", | |
| 32 sActivationDelayMs); | |
| 33 sActivationDelayMsSet = true; | |
| 34 } | |
| 35 } | |
| 36 | |
| 37 ActiveElementManager::~ActiveElementManager() {} | |
| 38 | |
| 39 void | |
| 40 ActiveElementManager::SetTargetElement(nsIDOMEventTarget* aTarget) | |
| 41 { | |
| 42 if (mTarget) { | |
| 43 // Multiple fingers on screen (since HandleTouchEnd clears mTarget). | |
| 44 CancelTask(); | |
| 45 ResetActive(); | |
| 46 mTarget = nullptr; | |
| 47 return; | |
| 48 } | |
| 49 | |
| 50 mTarget = do_QueryInterface(aTarget); | |
| 51 TriggerElementActivation(); | |
| 52 } | |
| 53 | |
| 54 void | |
| 55 ActiveElementManager::HandleTouchStart(bool aCanBePan) | |
| 56 { | |
| 57 mCanBePan = aCanBePan; | |
| 58 mCanBePanSet = true; | |
| 59 TriggerElementActivation(); | |
| 60 } | |
| 61 | |
| 62 void | |
| 63 ActiveElementManager::TriggerElementActivation() | |
| 64 { | |
| 65 // Both HandleTouchStart() and SetTargetElement() call this. They can be | |
| 66 // called in either order. One will set mCanBePanSet, and the other, mTarget. | |
| 67 // We want to actually trigger the activation once both are set. | |
| 68 if (!(mTarget && mCanBePanSet)) { | |
| 69 return; | |
| 70 } | |
| 71 | |
| 72 // If the touch cannot be a pan, make mTarget :active right away. | |
| 73 // Otherwise, wait a bit to see if the user will pan or not. | |
| 74 if (!mCanBePan) { | |
| 75 SetActive(mTarget); | |
| 76 } else { | |
| 77 mSetActiveTask = NewRunnableMethod( | |
| 78 this, &ActiveElementManager::SetActiveTask, mTarget); | |
| 79 MessageLoop::current()->PostDelayedTask( | |
| 80 FROM_HERE, mSetActiveTask, sActivationDelayMs); | |
| 81 } | |
| 82 } | |
| 83 | |
| 84 void | |
| 85 ActiveElementManager::HandlePanStart() | |
| 86 { | |
| 87 // The user started to pan, so we don't want mTarget to be :active. | |
| 88 // Make it not :active, and clear any pending task to make it :active. | |
| 89 CancelTask(); | |
| 90 ResetActive(); | |
| 91 } | |
| 92 | |
| 93 void | |
| 94 ActiveElementManager::HandleTouchEnd(bool aWasClick) | |
| 95 { | |
| 96 // If the touch was a click, make mTarget :active right away. | |
| 97 // nsEventStateManager will reset the active element when processing | |
| 98 // the mouse-down event generated by the click. | |
| 99 CancelTask(); | |
| 100 if (aWasClick) { | |
| 101 SetActive(mTarget); | |
| 102 } | |
| 103 | |
| 104 // Clear mTarget for next touch. | |
| 105 mTarget = nullptr; | |
| 106 } | |
| 107 | |
| 108 void | |
| 109 ActiveElementManager::SetActive(nsIDOMElement* aTarget) | |
| 110 { | |
| 111 if (mDomUtils) { | |
| 112 mDomUtils->SetContentState(aTarget, NS_EVENT_STATE_ACTIVE.GetInternalValue());; | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 void | |
| 117 ActiveElementManager::ResetActive() | |
| 118 { | |
| 119 // Clear the :active flag from mTarget by setting it on the document root. | |
| 120 if (mTarget) { | |
| 121 nsCOMPtr<nsIDOMDocument> doc; | |
| 122 mTarget->GetOwnerDocument(getter_AddRefs(doc)); | |
| 123 if (doc) { | |
| 124 nsCOMPtr<nsIDOMElement> root; | |
| 125 doc->GetDocumentElement(getter_AddRefs(root)); | |
| 126 if (root) { | |
| 127 SetActive(root); | |
| 128 } | |
| 129 } | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 void | |
| 134 ActiveElementManager::SetActiveTask(nsIDOMElement* aTarget) | |
| 135 { | |
| 136 // This gets called from mSetActiveTask's Run() method. The message loop | |
| 137 // deletes the task right after running it, so we need to null out | |
| 138 // mSetActiveTask to make sure we're not left with a dangling pointer. | |
| 139 mSetActiveTask = nullptr; | |
| 140 SetActive(aTarget); | |
| 141 } | |
| 142 | |
| 143 void | |
| 144 ActiveElementManager::CancelTask() | |
| 145 { | |
| 146 if (mSetActiveTask) { | |
| 147 mSetActiveTask->Cancel(); | |
| 148 mSetActiveTask = nullptr; | |
| 149 } | |
| 150 } | |
| 151 | |
| 152 } | |
| 153 } |
