gfx/layers/apz/util/ActiveElementManager.cpp@6474c204b198 (annotated)
gfx/layers/apz/util/ActiveElementManager.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include "ActiveElementManager.h" |
| michael@0 | 7 | #include "mozilla/EventStates.h" |
| michael@0 | 8 | #include "mozilla/Preferences.h" |
| michael@0 | 9 | #include "mozilla/Services.h" |
| michael@0 | 10 | #include "inIDOMUtils.h" |
| michael@0 | 11 | #include "nsIDOMDocument.h" |
| michael@0 | 12 | #include "nsIDOMElement.h" |
| michael@0 | 13 | #include "nsIDOMEventTarget.h" |
| michael@0 | 14 | #include "base/message_loop.h" |
| michael@0 | 15 | #include "base/task.h" |
| michael@0 | 16 | |
| michael@0 | 17 | namespace mozilla { |
| michael@0 | 18 | namespace layers { |
| michael@0 | 19 | |
| michael@0 | 20 | static int32_t sActivationDelayMs = 100; |
| michael@0 | 21 | static bool sActivationDelayMsSet = false; |
| michael@0 | 22 | |
| michael@0 | 23 | ActiveElementManager::ActiveElementManager() |
| michael@0 | 24 | : mDomUtils(services::GetInDOMUtils()), |
| michael@0 | 25 | mCanBePan(false), |
| michael@0 | 26 | mCanBePanSet(false), |
| michael@0 | 27 | mSetActiveTask(nullptr) |
| michael@0 | 28 | { |
| michael@0 | 29 | if (!sActivationDelayMsSet) { |
| michael@0 | 30 | Preferences::AddIntVarCache(&sActivationDelayMs, |
| michael@0 | 31 | "ui.touch_activation.delay_ms", |
| michael@0 | 32 | sActivationDelayMs); |
| michael@0 | 33 | sActivationDelayMsSet = true; |
| michael@0 | 34 | } |
| michael@0 | 35 | } |
| michael@0 | 36 | |
| michael@0 | 37 | ActiveElementManager::~ActiveElementManager() {} |
| michael@0 | 38 | |
| michael@0 | 39 | void |
| michael@0 | 40 | ActiveElementManager::SetTargetElement(nsIDOMEventTarget* aTarget) |
| michael@0 | 41 | { |
| michael@0 | 42 | if (mTarget) { |
| michael@0 | 43 | // Multiple fingers on screen (since HandleTouchEnd clears mTarget). |
| michael@0 | 44 | CancelTask(); |
| michael@0 | 45 | ResetActive(); |
| michael@0 | 46 | mTarget = nullptr; |
| michael@0 | 47 | return; |
| michael@0 | 48 | } |
| michael@0 | 49 | |
| michael@0 | 50 | mTarget = do_QueryInterface(aTarget); |
| michael@0 | 51 | TriggerElementActivation(); |
| michael@0 | 52 | } |
| michael@0 | 53 | |
| michael@0 | 54 | void |
| michael@0 | 55 | ActiveElementManager::HandleTouchStart(bool aCanBePan) |
| michael@0 | 56 | { |
| michael@0 | 57 | mCanBePan = aCanBePan; |
| michael@0 | 58 | mCanBePanSet = true; |
| michael@0 | 59 | TriggerElementActivation(); |
| michael@0 | 60 | } |
| michael@0 | 61 | |
| michael@0 | 62 | void |
| michael@0 | 63 | ActiveElementManager::TriggerElementActivation() |
| michael@0 | 64 | { |
| michael@0 | 65 | // Both HandleTouchStart() and SetTargetElement() call this. They can be |
| michael@0 | 66 | // called in either order. One will set mCanBePanSet, and the other, mTarget. |
| michael@0 | 67 | // We want to actually trigger the activation once both are set. |
| michael@0 | 68 | if (!(mTarget && mCanBePanSet)) { |
| michael@0 | 69 | return; |
| michael@0 | 70 | } |
| michael@0 | 71 | |
| michael@0 | 72 | // If the touch cannot be a pan, make mTarget :active right away. |
| michael@0 | 73 | // Otherwise, wait a bit to see if the user will pan or not. |
| michael@0 | 74 | if (!mCanBePan) { |
| michael@0 | 75 | SetActive(mTarget); |
| michael@0 | 76 | } else { |
| michael@0 | 77 | mSetActiveTask = NewRunnableMethod( |
| michael@0 | 78 | this, &ActiveElementManager::SetActiveTask, mTarget); |
| michael@0 | 79 | MessageLoop::current()->PostDelayedTask( |
| michael@0 | 80 | FROM_HERE, mSetActiveTask, sActivationDelayMs); |
| michael@0 | 81 | } |
| michael@0 | 82 | } |
| michael@0 | 83 | |
| michael@0 | 84 | void |
| michael@0 | 85 | ActiveElementManager::HandlePanStart() |
| michael@0 | 86 | { |
| michael@0 | 87 | // The user started to pan, so we don't want mTarget to be :active. |
| michael@0 | 88 | // Make it not :active, and clear any pending task to make it :active. |
| michael@0 | 89 | CancelTask(); |
| michael@0 | 90 | ResetActive(); |
| michael@0 | 91 | } |
| michael@0 | 92 | |
| michael@0 | 93 | void |
| michael@0 | 94 | ActiveElementManager::HandleTouchEnd(bool aWasClick) |
| michael@0 | 95 | { |
| michael@0 | 96 | // If the touch was a click, make mTarget :active right away. |
| michael@0 | 97 | // nsEventStateManager will reset the active element when processing |
| michael@0 | 98 | // the mouse-down event generated by the click. |
| michael@0 | 99 | CancelTask(); |
| michael@0 | 100 | if (aWasClick) { |
| michael@0 | 101 | SetActive(mTarget); |
| michael@0 | 102 | } |
| michael@0 | 103 | |
| michael@0 | 104 | // Clear mTarget for next touch. |
| michael@0 | 105 | mTarget = nullptr; |
| michael@0 | 106 | } |
| michael@0 | 107 | |
| michael@0 | 108 | void |
| michael@0 | 109 | ActiveElementManager::SetActive(nsIDOMElement* aTarget) |
| michael@0 | 110 | { |
| michael@0 | 111 | if (mDomUtils) { |
| michael@0 | 112 | mDomUtils->SetContentState(aTarget, NS_EVENT_STATE_ACTIVE.GetInternalValue());; |
| michael@0 | 113 | } |
| michael@0 | 114 | } |
| michael@0 | 115 | |
| michael@0 | 116 | void |
| michael@0 | 117 | ActiveElementManager::ResetActive() |
| michael@0 | 118 | { |
| michael@0 | 119 | // Clear the :active flag from mTarget by setting it on the document root. |
| michael@0 | 120 | if (mTarget) { |
| michael@0 | 121 | nsCOMPtr<nsIDOMDocument> doc; |
| michael@0 | 122 | mTarget->GetOwnerDocument(getter_AddRefs(doc)); |
| michael@0 | 123 | if (doc) { |
| michael@0 | 124 | nsCOMPtr<nsIDOMElement> root; |
| michael@0 | 125 | doc->GetDocumentElement(getter_AddRefs(root)); |
| michael@0 | 126 | if (root) { |
| michael@0 | 127 | SetActive(root); |
| michael@0 | 128 | } |
| michael@0 | 129 | } |
| michael@0 | 130 | } |
| michael@0 | 131 | } |
| michael@0 | 132 | |
| michael@0 | 133 | void |
| michael@0 | 134 | ActiveElementManager::SetActiveTask(nsIDOMElement* aTarget) |
| michael@0 | 135 | { |
| michael@0 | 136 | // This gets called from mSetActiveTask's Run() method. The message loop |
| michael@0 | 137 | // deletes the task right after running it, so we need to null out |
| michael@0 | 138 | // mSetActiveTask to make sure we're not left with a dangling pointer. |
| michael@0 | 139 | mSetActiveTask = nullptr; |
| michael@0 | 140 | SetActive(aTarget); |
| michael@0 | 141 | } |
| michael@0 | 142 | |
| michael@0 | 143 | void |
| michael@0 | 144 | ActiveElementManager::CancelTask() |
| michael@0 | 145 | { |
| michael@0 | 146 | if (mSetActiveTask) { |
| michael@0 | 147 | mSetActiveTask->Cancel(); |
| michael@0 | 148 | mSetActiveTask = nullptr; |
| michael@0 | 149 | } |
| michael@0 | 150 | } |
| michael@0 | 151 | |
| michael@0 | 152 | } |
| michael@0 | 153 | } |
