Upstream Layout.java and associated files

chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelStateHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelStateHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelStateHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelStateHandler.java
new file mode 100644
index 0000000000000000000000000000000000000000..a775698d7fc9035061834e91867a9ea0d7b373a5
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPanelStateHandler.java
@@ -0,0 +1,263 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.compositor.bottombar.contextualsearch;
+
+import org.chromium.chrome.browser.compositor.bottombar.contextualsearch.ContextualSearchPanel.PanelState;
+import org.chromium.chrome.browser.compositor.bottombar.contextualsearch.ContextualSearchPanel.StateChangeReason;
+import org.chromium.chrome.browser.contextualsearch.ContextualSearchUma;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Holds the state of the Contextual Search Panel.
+ */
+abstract class ContextualSearchPanelStateHandler {
+
+    // Valid previous states for when the promo is active.
+    private static final Map<PanelState, PanelState> PREVIOUS_STATES_PROMO;
+    static {
+        Map<PanelState, PanelState> states = new HashMap<PanelState, PanelState>();
+        // Pairs are of the form <Current, Previous>.
+        states.put(PanelState.PEEKED, PanelState.CLOSED);
+        states.put(PanelState.PROMO, PanelState.PEEKED);
+        states.put(PanelState.EXPANDED, PanelState.PROMO);
+        PREVIOUS_STATES_PROMO = Collections.unmodifiableMap(states);
+    }
+
+    // Valid previous states for when the promo is not active (normal flow).
+    private static final Map<PanelState, PanelState> PREVIOUS_STATES_NORMAL;
+    static {
+        Map<PanelState, PanelState> states = new HashMap<PanelState, PanelState>();
+        // Pairs are of the form <Current, Previous>.
+        states.put(PanelState.PEEKED, PanelState.CLOSED);
+        states.put(PanelState.EXPANDED, PanelState.PEEKED);
+        states.put(PanelState.MAXIMIZED, PanelState.EXPANDED);
+        PREVIOUS_STATES_NORMAL = Collections.unmodifiableMap(states);
+    }
+
+    // The current state of the Contextual Search Panel.
+    private PanelState mPanelState = PanelState.UNDEFINED;
+    private boolean mDidSearchInvolvePromo;
+    private boolean mWasSearchContentViewSeen;
+    private boolean mIsPromoActive;
+    private boolean mHasExpanded;
+    private boolean mHasMaximized;
+    private boolean mHasExitedPeeking;
+    private boolean mHasExitedExpanded;
+    private boolean mHasExitedMaximized;
+    private boolean mIsSerpNavigation;
+    private long mSearchStartTimeNs;
+
+    // --------------------------------------------------------------------------------------------
+    // Contextual Search Panel states
+    // --------------------------------------------------------------------------------------------
+
+    /**
+     * @return The panel's state.
+     */
+    PanelState getPanelState() {
+        return mPanelState;
+    }
+
+    /**
+     * @return The {@code PanelState} that is before the |state| in the order of states.
+     */
+    PanelState getPreviousPanelState(PanelState state) {
+        PanelState prevState = mIsPromoActive
+                ? PREVIOUS_STATES_PROMO.get(state)
+                : PREVIOUS_STATES_NORMAL.get(state);
+        return prevState != null ? prevState : PanelState.UNDEFINED;
+    }
+
+    /**
+     * Return the maximum state that the panel can be in, depending on whether the promo is
+     * active.
+     */
+    PanelState getMaximumState() {
+        return mIsPromoActive ? PanelState.PROMO : PanelState.MAXIMIZED;
+    }
+
+    /**
+     * Return the intermediary state that the panel can be in, depending on whether the promo is
+     * active.
+     */
+    PanelState getIntermediaryState() {
+        return mIsPromoActive ? PanelState.PROMO : PanelState.EXPANDED;
+    }
+
+    /**
+     * Sets the panel's state.
+     * @param toState The panel state to transition to.
+     * @param reason The reason for a change in the panel's state.
+     */
+    protected void setPanelState(PanelState toState, StateChangeReason reason) {
+        // Note: the logging within this function includes the promo, unless specifically
+        // excluded.
+        PanelState fromState = mPanelState;
+        boolean isStartingSearch = isStartingNewContextualSearch(toState, reason);
+        boolean isEndingSearch = isEndingContextualSearch(toState, isStartingSearch);
+        boolean isChained = isStartingSearch && isOngoingContextualSearch();
+        boolean isSameState = fromState == toState;
+        boolean isFirstExitFromPeeking = fromState == PanelState.PEEKED && !mHasExitedPeeking
+                && (!isSameState || isStartingSearch);
+        boolean isFirstExitFromExpanded = fromState == PanelState.EXPANDED && !mHasExitedExpanded
+                && !isSameState;
+        boolean isFirstExitFromMaximized = fromState == PanelState.MAXIMIZED && !mHasExitedMaximized
+                && !isSameState;
+
+        if (isEndingSearch) {
+            if (!mDidSearchInvolvePromo) {
+                // Measure duration only when the promo is not involved.
+                long durationMs = (System.nanoTime() - mSearchStartTimeNs) / 1000000;
+                ContextualSearchUma.logDuration(mWasSearchContentViewSeen, isChained, durationMs);
+            }
+            if (mIsPromoActive) {
+                // The user is exiting still in the promo, without choosing an option.
+                ContextualSearchUma.logFirstRunPanelSeen(mWasSearchContentViewSeen);
+            } else {
+                ContextualSearchUma.logResultsSeen(mWasSearchContentViewSeen);
+            }
+        }
+        if (isStartingSearch) {
+            mSearchStartTimeNs = System.nanoTime();
+        }
+
+        // Log state changes. We only log the first transition to a state within a contextual
+        // search. Note that when a user clicks on a link on the search content view, this will
+        // trigger a transition to MAXIMIZED (SERP_NAVIGATION) followed by a transition to
+        // CLOSED (TAB_PROMOTION). For the purpose of logging, the reason for the second transition
+        // is reinterpreted to SERP_NAVIGATION, in order to distinguish it from a tab promotion
+        // caused when tapping on the Search Bar when the Panel is maximized.
+        StateChangeReason reasonForLogging =
+                mIsSerpNavigation ? StateChangeReason.SERP_NAVIGATION : reason;
+        if (isStartingSearch || isEndingSearch
+                || (!mHasExpanded && toState == PanelState.EXPANDED)
+                || (!mHasMaximized && toState == PanelState.MAXIMIZED)) {
+            ContextualSearchUma.logFirstStateEntry(fromState, toState, reasonForLogging);
+        }
+        // Note: CLOSED / UNDEFINED state exits are detected when a search that is not chained is
+        // starting.
+        if ((isStartingSearch && !isChained) || isFirstExitFromPeeking || isFirstExitFromExpanded
+                || isFirstExitFromMaximized) {
+            ContextualSearchUma.logFirstStateExit(fromState, toState, reasonForLogging);
+        }
+
+        // We can now modify the state.
+        if (isFirstExitFromPeeking) {
+            mHasExitedPeeking = true;
+        } else if (isFirstExitFromExpanded) {
+            mHasExitedExpanded = true;
+        } else if (isFirstExitFromMaximized) {
+            mHasExitedMaximized = true;
+        }
+
+        mPanelState = toState;
+
+        if (toState == PanelState.EXPANDED) {
+            mHasExpanded = true;
+        } else if (toState == PanelState.MAXIMIZED) {
+            mHasMaximized = true;
+        }
+        if (reason == StateChangeReason.SERP_NAVIGATION) {
+            mIsSerpNavigation = true;
+        }
+
+        if (isEndingSearch) {
+            mDidSearchInvolvePromo = false;
+            mWasSearchContentViewSeen = false;
+            mHasExpanded = false;
+            mHasMaximized = false;
+            mHasExitedPeeking = false;
+            mHasExitedExpanded = false;
+            mHasExitedMaximized = false;
+            mIsSerpNavigation = false;
+        }
+
+        // TODO(manzagop): When the user opts in, we should replay his actions for the current
+        // contextual search for the standard (non promo) UMA histograms.
+    }
+
+    /**
+     * Determine if a specific {@code PanelState} is a valid state in the current environment.
+     * @param state The state being evaluated.
+     * @return whether the state is valid.
+     */
+    boolean isValidState(PanelState state) {
+        ArrayList<PanelState> validStates;
+        if (mIsPromoActive) {
+            validStates = new ArrayList<PanelState>(PREVIOUS_STATES_PROMO.values());
+        } else {
+            validStates = new ArrayList<PanelState>(PREVIOUS_STATES_NORMAL.values());
+            // MAXIMIZED is not the previous state of anything, but it's a valid state.
+            validStates.add(PanelState.MAXIMIZED);
+        }
+
+        return validStates.contains(state);
+    }
+
+    /**
+     * Sets that the contextual search involved the promo.
+     */
+    void setDidSearchInvolvePromo() {
+        mDidSearchInvolvePromo = true;
+    }
+
+    /**
+     * Sets that the Search Content View was seen.
+     */
+    void setWasSearchContentViewSeen() {
+        mWasSearchContentViewSeen = true;
+    }
+
+    /**
+     * Sets whether the promo is active.
+     */
+    void setIsPromoActive(boolean shown) {
+        mIsPromoActive = shown;
+    }
+
+    /**
+     * Gets whether the promo is active.
+     */
+    boolean getIsPromoActive() {
+        return mIsPromoActive;
+    }
+
+    // --------------------------------------------------------------------------------------------
+    // Helpers
+    // --------------------------------------------------------------------------------------------
+
+    /**
+     * Determine whether a new contextual search is starting.
+     * @param toState The contextual search state that will be transitioned to.
+     * @param reason The reason for the search state transition.
+     * @return Whether a new contextual search is starting.
+     */
+    private boolean isStartingNewContextualSearch(PanelState toState, StateChangeReason reason) {
+        return toState == PanelState.PEEKED
+                && (reason == StateChangeReason.TEXT_SELECT_TAP
+                        || reason == StateChangeReason.TEXT_SELECT_LONG_PRESS);
+    }
+
+    /**
+     * Determine whether a contextual search is ending.
+     * @param toState The contextual search state that will be transitioned to.
+     * @param isStartingSearch Whether a new contextual search is starting.
+     * @return Whether a contextual search is ending.
+     */
+    private boolean isEndingContextualSearch(PanelState toState, boolean isStartingSearch) {
+        return isOngoingContextualSearch() && (toState == PanelState.CLOSED || isStartingSearch);
+    }
+
+    /**
+     * @return Whether there is an ongoing contextual search.
+     */
+    private boolean isOngoingContextualSearch() {
+        return mPanelState != PanelState.UNDEFINED && mPanelState != PanelState.CLOSED;
+    }
+}