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Bug 976605 - Introduce ActiveElementManager. r=kats
--HG-- extra : source : 6a6df3a3bca872fb91bec1e301632adcf1c390e3
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widget/xpwidgets/ActiveElementManager.cpp
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151
widget/xpwidgets/ActiveElementManager.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ActiveElementManager.h"
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#include "mozilla/EventStates.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/Services.h"
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#include "inIDOMUtils.h"
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#include "nsIDOMDocument.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMEventTarget.h"
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#include "base/message_loop.h"
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#include "base/task.h"
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namespace mozilla {
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namespace widget {
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static int32_t sActivationDelayMs = 100;
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static bool sActivationDelayMsSet = false;
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ActiveElementManager::ActiveElementManager()
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: mDomUtils(services::GetInDOMUtils()),
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mCanBePan(false),
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mCanBePanSet(false),
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mSetActiveTask(nullptr)
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{
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if (!sActivationDelayMsSet) {
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Preferences::AddIntVarCache(&sActivationDelayMs,
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"ui.touch_activation.delay_ms",
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sActivationDelayMs);
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sActivationDelayMsSet = true;
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}
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}
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ActiveElementManager::~ActiveElementManager() {}
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void
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ActiveElementManager::SetTargetElement(nsIDOMEventTarget* aTarget)
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{
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if (mTarget) {
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// Multiple fingers on screen (since HandleTouchEnd clears mTarget).
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ResetActive();
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return;
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}
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mTarget = do_QueryInterface(aTarget);
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TriggerElementActivation();
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}
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void
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ActiveElementManager::HandleTouchStart(bool aCanBePan)
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{
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mCanBePan = aCanBePan;
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mCanBePanSet = true;
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TriggerElementActivation();
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}
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void
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ActiveElementManager::TriggerElementActivation()
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{
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// Both HandleTouchStart() and SetTargetElement() call this. They can be
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// called in either order. One will set mCanBePanSet, and the other, mTarget.
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// We want to actually trigger the activation once both are set.
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if (!(mTarget && mCanBePanSet)) {
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return;
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}
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// If the touch cannot be a pan, make mTarget :active right away.
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// Otherwise, wait a bit to see if the user will pan or not.
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if (!mCanBePan) {
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SetActive(mTarget);
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} else {
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mSetActiveTask = NewRunnableMethod(
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this, &ActiveElementManager::SetActiveTask, mTarget);
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MessageLoop::current()->PostDelayedTask(
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FROM_HERE, mSetActiveTask, sActivationDelayMs);
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}
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}
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void
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ActiveElementManager::HandlePanStart()
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{
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// The user started to pan, so we don't want mTarget to be :active.
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// Make it not :active, and clear any pending task to make it :active.
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CancelTask();
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ResetActive();
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}
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void
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ActiveElementManager::HandleTouchEnd(bool aWasClick)
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{
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// If the touch was a click, make mTarget :active right away.
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// nsEventStateManager will reset the active element when processing
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// the mouse-down event generated by the click.
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CancelTask();
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if (aWasClick) {
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SetActive(mTarget);
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}
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// Clear mTarget for next touch.
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mTarget = nullptr;
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}
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void
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ActiveElementManager::SetActive(nsIDOMElement* aTarget)
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{
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if (mDomUtils) {
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mDomUtils->SetContentState(aTarget, NS_EVENT_STATE_ACTIVE.GetInternalValue());;
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}
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}
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void
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ActiveElementManager::ResetActive()
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{
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// Clear the :active flag from mTarget by setting it on the document root.
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if (mTarget) {
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nsCOMPtr<nsIDOMDocument> doc;
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mTarget->GetOwnerDocument(getter_AddRefs(doc));
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if (doc) {
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nsCOMPtr<nsIDOMElement> root;
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doc->GetDocumentElement(getter_AddRefs(root));
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if (root) {
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SetActive(root);
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}
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}
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}
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}
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void
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ActiveElementManager::SetActiveTask(nsIDOMElement* aTarget)
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{
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// This gets called from mSetActiveTask's Run() method. The message loop
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// deletes the task right after running it, so we need to null out
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// mSetActiveTask to make sure we're not left with a dangling pointer.
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mSetActiveTask = nullptr;
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SetActive(aTarget);
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}
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void
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ActiveElementManager::CancelTask()
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{
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if (mSetActiveTask) {
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mSetActiveTask->Cancel();
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mSetActiveTask = nullptr;
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}
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}
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}
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}
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85
widget/xpwidgets/ActiveElementManager.h
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85
widget/xpwidgets/ActiveElementManager.h
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __mozilla_widget_ActiveElementManager_h__
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#define __mozilla_widget_ActiveElementManager_h__
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#include "nsCOMPtr.h"
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#include "nsISupportsImpl.h"
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class inIDOMUtils;
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class nsIDOMEventTarget;
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class nsIDOMElement;
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class CancelableTask;
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namespace mozilla {
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namespace widget {
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/**
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* Manages setting and clearing the ':active' CSS pseudostate in the presence
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* of touch input.
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*/
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class ActiveElementManager {
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public:
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NS_INLINE_DECL_REFCOUNTING(ActiveElementManager)
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ActiveElementManager();
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~ActiveElementManager();
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/**
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* Specify the target of a touch. Typically this should be called right
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* before HandleTouchStart(), but we give callers the flexibility to specify
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* the target later if they don't know it at the time they call
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* HandleTouchStart().
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* |aTarget| may be nullptr.
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*/
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void SetTargetElement(nsIDOMEventTarget* aTarget);
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/**
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* Handle a touch-start event.
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* @param aCanBePan whether the touch can be a pan
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*/
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void HandleTouchStart(bool aCanBePan);
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/**
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* Handle the start of panning.
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*/
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void HandlePanStart();
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/**
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* Handle a touch-end or touch-cancel event.
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* @param aWasClick whether the touch was a click
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*/
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void HandleTouchEnd(bool aWasClick);
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private:
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nsCOMPtr<inIDOMUtils> mDomUtils;
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/**
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* The target of the first touch point in the current touch block.
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*/
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nsCOMPtr<nsIDOMElement> mTarget;
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/**
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* Whether the current touch block can be a pan. Set in HandleTouchStart().
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*/
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bool mCanBePan;
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/**
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* Whether mCanBePan has been set for the current touch block.
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* We need to keep track of this to allow HandleTouchStart() and
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* SetTargetElement() to be called in either order.
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*/
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bool mCanBePanSet;
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/**
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* A task for calling SetActive() after a timeout.
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*/
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CancelableTask* mSetActiveTask;
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// Helpers
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void TriggerElementActivation();
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void SetActive(nsIDOMElement* aTarget);
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void ResetActive();
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void SetActiveTask(nsIDOMElement* aTarget);
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void CancelTask();
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};
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}
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}
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#endif /*__mozilla_widget_ActiveElementManager_h__ */
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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EXPORTS += [
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'ActiveElementManager.h',
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'APZCCallbackHelper.h',
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'ContentHelper.h',
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'GfxDriverInfo.h',
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@ -13,6 +14,7 @@ EXPORTS += [
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]
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UNIFIED_SOURCES += [
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'ActiveElementManager.cpp',
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'APZCCallbackHelper.cpp',
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'ContentHelper.cpp',
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'GfxDriverInfo.cpp',
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