[ContextualSearch] Adds long press promo for Contextual Search.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPeekPromoControl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPeekPromoControl.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPeekPromoControl.java
new file mode 100644
index 0000000000000000000000000000000000000000..872016691b64a20a26495c0eea558c2a668e20ef
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/bottombar/contextualsearch/ContextualSearchPeekPromoControl.java
@@ -0,0 +1,247 @@
+// 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 android.content.Context;
+import android.view.ViewGroup;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation;
+import org.chromium.chrome.browser.util.MathUtils;
+import org.chromium.ui.resources.dynamics.DynamicResourceLoader;
+
+/**
+ * Controls the Search Peek Promo.
+ */
+public class ContextualSearchPeekPromoControl extends ContextualSearchInflater
+        implements ChromeAnimation.Animatable<ContextualSearchPeekPromoControl.AnimationType> {
+
+    /**
+     * Animation properties.
+     */
+    protected enum AnimationType {
+        APPEARANCE
+    }
+
+    /**
+     * The initial width of the ripple for the appearance animation, in dps.
+     */
+    private static final float RIPPLE_MINIMUM_WIDTH_DP = 56.f;
+
+    /**
+     * Whether the Peek Promo is visible.
+     */
+    private boolean mIsVisible;
+
+    /**
+     * The height of the Peek Promo, in pixels.
+     */
+    private float mHeightPx;
+
+    /**
+     * The width of the Ripple resource in pixels.
+     */
+    private float mRippleWidthPx;
+
+    /**
+     * The opacity of the Ripple resource.
+     */
+    private float mRippleOpacity;
+
+    /**
+     * The opacity of the Promo Text View dynamic resource.
+     */
+    private float mTextOpacity;
+
+    /**
+     * The precomputed padding of the Peek Promo, in pixels.
+     */
+    private final float mPaddingPx;
+
+    /**
+     * The precomputed default height of the Peek Promo in pixels.
+     */
+    private final float mDefaultHeightPx;
+
+    /**
+     * The precomputed minimum width of the Ripple resource in pixels.
+     */
+    private final float mRippleMinimumWidthPx;
+
+    /**
+     * The precomputed maximum width of the Ripple resource in pixels.
+     */
+    private final float mRippleMaximumWidthPx;
+
+    /**
+     * @param panel             The panel delegate.
+     * @param context           The Android Context used to inflate the View.
+     * @param container         The container View used to inflate the View.
+     * @param resourceLoader    The resource loader that will handle the snapshot capturing.
+     */
+    public ContextualSearchPeekPromoControl(ContextualSearchPanelDelegate panel,
+                                          Context context,
+                                          ViewGroup container,
+                                          DynamicResourceLoader resourceLoader) {
+        super(panel, R.layout.contextual_search_peek_promo, R.id.contextual_search_peek_promo,
+                context, container, resourceLoader);
+
+        final float dpToPx = context.getResources().getDisplayMetrics().density;
+
+        mDefaultHeightPx = context.getResources().getDimensionPixelOffset(
+                R.dimen.contextual_search_peek_promo_height);
+        mPaddingPx = context.getResources().getDimensionPixelOffset(
+                R.dimen.contextual_search_peek_promo_padding);
+
+        mRippleMinimumWidthPx = RIPPLE_MINIMUM_WIDTH_DP * dpToPx;
+        mRippleMaximumWidthPx = panel.getMaximumWidthPx();
+    }
+
+    /**
+     * Shows the Peek Promo. This includes inflating the View and setting it to its initial state.
+     * This also means a new cc::Layer will be created and added to the tree.
+     */
+    void show() {
+        if (mIsVisible) return;
+
+        mIsVisible = true;
+        mHeightPx = Math.round(mDefaultHeightPx);
+
+        invalidate();
+    }
+
+    /**
+     * Hides the Peek Promo, returning the Control to its initial uninitialized state. In this
+     * state, now View will be created and no Layer added to the tree (or removed if present).
+     */
+    void hide() {
+        if (!mIsVisible) return;
+
+        mIsVisible = false;
+        mHeightPx = 0.f;
+    }
+
+    // ============================================================================================
+    // Public API
+    // ============================================================================================
+
+    /**
+     * @return Whether the Peek Promo is visible.
+     */
+    public boolean isVisible() {
+        return mIsVisible;
+    }
+
+    /**
+     * @return The Peek Promo height in pixels.
+     */
+    public float getHeightPx() {
+        return mHeightPx;
+    }
+
+    /**
+     * @return The Peek Promo padding in pixels.
+     */
+    public float getPaddingPx() {
+        return mPaddingPx;
+    }
+
+    /**
+     * @return The width of the Ripple resource in pixels.
+     */
+    public float getRippleWidthPx() {
+        return mRippleWidthPx;
+    }
+
+    /**
+     * @return The opacity of the Ripple resource.
+     */
+    public float getRippleOpacity() {
+        return mRippleOpacity;
+    }
+
+    /**
+     * @return The opacity of the Promo Text View dynamic resource.
+     */
+    public float getTextOpacity() {
+        return mTextOpacity;
+    }
+
+    // ============================================================================================
+    // Panel Animation
+    // ============================================================================================
+
+    /**
+     * Interpolates the UI from states Closed to Peeked.
+     *
+     * @param percentage The completion percentage.
+     */
+    public void onUpdateFromCloseToPeek(float percentage) {
+        if (!isVisible()) return;

[pedro (no code reviews), 2015/10/03 00:11:27]

Note that nothing will be calculated when the promo is not visible.

When we call getPeekPromoControl() from ContextualSearchManager, it will create
a class and cache it for as long the Panel keeps opened. If the Promo is not
available that class will be just a dummy one, and it will not do anything. I
will not inflate the View neither calculate interpolations. I will just return
the default values that the Compositor needs to know.

+
+        mHeightPx = Math.round(mDefaultHeightPx);
+    }
+
+    /**
+     * Interpolates the UI from states Peeked to Expanded.
+     *
+     * @param percentage The completion percentage.
+     */
+    public void onUpdateFromPeekToExpand(float percentage) {
+        if (!isVisible()) return;
+
+        mHeightPx = Math.round(MathUtils.interpolate(mDefaultHeightPx, 0.f, percentage));
+        mTextOpacity = MathUtils.interpolate(1.f, 0.f, percentage);
+    }
+
+    /**
+     * Interpolates the UI from states Expanded to Maximized.
+     *
+     * @param percentage The completion percentage.
+     */
+    public void onUpdateFromExpandToMaximize(float percentage) {
+        if (!isVisible()) return;
+
+        mHeightPx = 0.f;
+        mTextOpacity = 0.f;
+    }
+
+    // ============================================================================================
+    // Peek Promo Appearance Animation
+    // ============================================================================================
+
+    /**
+     * Animates the Peek Promo appearance.
+     */
+    public void animateAppearance() {
+        // TODO(pedrosimonetti): Find a generic way to tell when a specific animation finishes.
+        mSearchPanelDelegate.addToAnimation(this, AnimationType.APPEARANCE, 0.f, 1.f,
+                ContextualSearchPanelAnimation.BASE_ANIMATION_DURATION_MS, 0);
+    }
+
+    @Override
+    public void setProperty(AnimationType prop, float val) {

[aurimas (slooooooooow), 2015/10/02 22:58:37]

Make variable names proper words: type and value.

[pedro (no code reviews), 2015/10/03 00:11:27]

Done.

+        if (prop == AnimationType.APPEARANCE) {
+            updateForAppearanceAnimation(val);
+        }
+    }
+
+    /**
+     * Updates the UI for the appearance animation.
+     *
+     * @param percentage The completion percentage.
+     */
+    private void updateForAppearanceAnimation(float percentage) {
+        mRippleWidthPx = Math.round(MathUtils.interpolate(
+                mRippleMinimumWidthPx, mRippleMaximumWidthPx, percentage));
+
+        mRippleOpacity = MathUtils.interpolate(0.f, 1.f, percentage);
+
+        float textOpacityDelay = 0.5f;
+        float textOpacityPercentage =
+                Math.max(0, percentage - textOpacityDelay) / (1.f - textOpacityDelay);
+        mTextOpacity = MathUtils.interpolate(0.f, 1.f, textOpacityPercentage);
+    }
+}