michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "ActiveElementManager.h"
michael@0: #include "mozilla/EventStates.h"
michael@0: #include "mozilla/Preferences.h"
michael@0: #include "mozilla/Services.h"
michael@0: #include "inIDOMUtils.h"
michael@0: #include "nsIDOMDocument.h"
michael@0: #include "nsIDOMElement.h"
michael@0: #include "nsIDOMEventTarget.h"
michael@0: #include "base/message_loop.h"
michael@0: #include "base/task.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace layers {
michael@0: 
michael@0: static int32_t sActivationDelayMs = 100;
michael@0: static bool sActivationDelayMsSet = false;
michael@0: 
michael@0: ActiveElementManager::ActiveElementManager()
michael@0:   : mDomUtils(services::GetInDOMUtils()),
michael@0:     mCanBePan(false),
michael@0:     mCanBePanSet(false),
michael@0:     mSetActiveTask(nullptr)
michael@0: {
michael@0:   if (!sActivationDelayMsSet) {
michael@0:     Preferences::AddIntVarCache(&sActivationDelayMs,
michael@0:                                 "ui.touch_activation.delay_ms",
michael@0:                                 sActivationDelayMs);
michael@0:     sActivationDelayMsSet = true;
michael@0:   }
michael@0: }
michael@0: 
michael@0: ActiveElementManager::~ActiveElementManager() {}
michael@0: 
michael@0: void
michael@0: ActiveElementManager::SetTargetElement(nsIDOMEventTarget* aTarget)
michael@0: {
michael@0:   if (mTarget) {
michael@0:     // Multiple fingers on screen (since HandleTouchEnd clears mTarget).
michael@0:     CancelTask();
michael@0:     ResetActive();
michael@0:     mTarget = nullptr;
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   mTarget = do_QueryInterface(aTarget);
michael@0:   TriggerElementActivation();
michael@0: }
michael@0: 
michael@0: void
michael@0: ActiveElementManager::HandleTouchStart(bool aCanBePan)
michael@0: {
michael@0:   mCanBePan = aCanBePan;
michael@0:   mCanBePanSet = true;
michael@0:   TriggerElementActivation();
michael@0: }
michael@0: 
michael@0: void
michael@0: ActiveElementManager::TriggerElementActivation()
michael@0: {
michael@0:   // Both HandleTouchStart() and SetTargetElement() call this. They can be
michael@0:   // called in either order. One will set mCanBePanSet, and the other, mTarget.
michael@0:   // We want to actually trigger the activation once both are set.
michael@0:   if (!(mTarget && mCanBePanSet)) {
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   // If the touch cannot be a pan, make mTarget :active right away.
michael@0:   // Otherwise, wait a bit to see if the user will pan or not.
michael@0:   if (!mCanBePan) {
michael@0:     SetActive(mTarget);
michael@0:   } else {
michael@0:     mSetActiveTask = NewRunnableMethod(
michael@0:         this, &ActiveElementManager::SetActiveTask, mTarget);
michael@0:     MessageLoop::current()->PostDelayedTask(
michael@0:         FROM_HERE, mSetActiveTask, sActivationDelayMs);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: ActiveElementManager::HandlePanStart()
michael@0: {
michael@0:   // The user started to pan, so we don't want mTarget to be :active.
michael@0:   // Make it not :active, and clear any pending task to make it :active.
michael@0:   CancelTask();
michael@0:   ResetActive();
michael@0: }
michael@0: 
michael@0: void
michael@0: ActiveElementManager::HandleTouchEnd(bool aWasClick)
michael@0: {
michael@0:   // If the touch was a click, make mTarget :active right away.
michael@0:   // nsEventStateManager will reset the active element when processing
michael@0:   // the mouse-down event generated by the click.
michael@0:   CancelTask();
michael@0:   if (aWasClick) {
michael@0:     SetActive(mTarget);
michael@0:   }
michael@0: 
michael@0:   // Clear mTarget for next touch.
michael@0:   mTarget = nullptr;
michael@0: }
michael@0: 
michael@0: void
michael@0: ActiveElementManager::SetActive(nsIDOMElement* aTarget)
michael@0: {
michael@0:   if (mDomUtils) {
michael@0:     mDomUtils->SetContentState(aTarget, NS_EVENT_STATE_ACTIVE.GetInternalValue());;
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: ActiveElementManager::ResetActive()
michael@0: {
michael@0:   // Clear the :active flag from mTarget by setting it on the document root.
michael@0:   if (mTarget) {
michael@0:     nsCOMPtr<nsIDOMDocument> doc;
michael@0:     mTarget->GetOwnerDocument(getter_AddRefs(doc));
michael@0:     if (doc) {
michael@0:       nsCOMPtr<nsIDOMElement> root;
michael@0:       doc->GetDocumentElement(getter_AddRefs(root));
michael@0:       if (root) {
michael@0:         SetActive(root);
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: ActiveElementManager::SetActiveTask(nsIDOMElement* aTarget)
michael@0: {
michael@0:   // This gets called from mSetActiveTask's Run() method. The message loop
michael@0:   // deletes the task right after running it, so we need to null out
michael@0:   // mSetActiveTask to make sure we're not left with a dangling pointer.
michael@0:   mSetActiveTask = nullptr;
michael@0:   SetActive(aTarget);
michael@0: }
michael@0: 
michael@0: void
michael@0: ActiveElementManager::CancelTask()
michael@0: {
michael@0:   if (mSetActiveTask) {
michael@0:     mSetActiveTask->Cancel();
michael@0:     mSetActiveTask = nullptr;
michael@0:   }
michael@0: }
michael@0: 
michael@0: }
michael@0: }