Animate hiding security button on custom tab toolbar

chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbarAnimationDelegate.java

+// 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.toolbar;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
+import android.view.View;
+
+import org.chromium.chrome.R;
+import org.chromium.ui.interpolators.BakedBezierInterpolator;
+
+/**
+ * A delegate class to handle animations in {@link CustomTabToolbar}.
+ */
+class CustomTabToolbarAnimationDelegate {
+    private static final int CUSTOM_TAB_TOOLBAR_SLIDE_DURATION_MS = 200;
+    private static final int CUSTOM_TAB_TOOLBAR_FADE_DURATION_MS = 150;
+
+    private final View mSecurityButton;
+    private final AnimatorSet mSecurityButtonShowAnimator;
+    private final AnimatorSet mSecurityButtonHideAnimator;
+
+    /**
+     * Constructs an instance of {@link CustomTabToolbarAnimationDelegate}.
+     */
+    CustomTabToolbarAnimationDelegate(View securityButton, final View titleUrlContainer) {
+        mSecurityButton = securityButton;
+
+        mSecurityButtonShowAnimator = new AnimatorSet();
+        int securityButtonWidth = securityButton.getResources()
+                .getDimensionPixelSize(R.dimen.location_bar_icon_width);
+        Animator translateRight = ObjectAnimator.ofFloat(titleUrlContainer,
+                View.TRANSLATION_X, securityButtonWidth);
+        translateRight.setInterpolator(BakedBezierInterpolator.TRANSFORM_CURVE);
+        translateRight.setDuration(CUSTOM_TAB_TOOLBAR_SLIDE_DURATION_MS);
+
+        Animator fadeIn = ObjectAnimator.ofFloat(mSecurityButton, View.ALPHA, 1);
+        fadeIn.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationStart(Animator animation) {
+                mSecurityButton.setVisibility(View.VISIBLE);
+                mSecurityButton.setAlpha(0f);
+                titleUrlContainer.setTranslationX(0);
+            }
+        });
+        fadeIn.setInterpolator(BakedBezierInterpolator.FADE_IN_CURVE);
+        fadeIn.setDuration(CUSTOM_TAB_TOOLBAR_FADE_DURATION_MS);
+        mSecurityButtonShowAnimator.playSequentially(translateRight, fadeIn);
+
+        mSecurityButtonHideAnimator = new AnimatorSet();
+        Animator fadeOut = ObjectAnimator.ofFloat(mSecurityButton, View.ALPHA, 0);
+        fadeOut.setInterpolator(BakedBezierInterpolator.FADE_OUT_CURVE);
+        fadeOut.setDuration(CUSTOM_TAB_TOOLBAR_FADE_DURATION_MS);
+
+        Animator translateLeft = ObjectAnimator.ofFloat(titleUrlContainer,
+                View.TRANSLATION_X, -securityButtonWidth);
+        translateLeft.setInterpolator(BakedBezierInterpolator.TRANSFORM_CURVE);
+        translateLeft.setDuration(CUSTOM_TAB_TOOLBAR_SLIDE_DURATION_MS);
+        translateLeft.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                mSecurityButton.setVisibility(View.GONE);
+                titleUrlContainer.setTranslationX(0);
+            }
+        });
+        mSecurityButtonHideAnimator.playSequentially(fadeOut, translateLeft);
+    }
+
+    /**
+     * Starts the animation to show the security button. Will do nothing if the button is already
+     * visible.
+     */
+    void showSecurityButton() {
+        if (mSecurityButton.getVisibility() == View.VISIBLE) return;
+        if (mSecurityButtonShowAnimator.isRunning()) mSecurityButtonShowAnimator.cancel();
+        mSecurityButtonShowAnimator.start();
+    }
+
+    /**
+     * Starts the animation to hide the security button. Will do nothing if the button is not
+     * visible.
+     */
+    void hideSecurityButton() {
+        if (mSecurityButton.getVisibility() == View.GONE) return;
+        if (mSecurityButtonHideAnimator.isRunning()) return;
+        mSecurityButtonHideAnimator.start();
+    }
+}