Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/LogoView.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.ntp;
+
+import android.animation.Animator;
+import android.animation.ObjectAnimator;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.text.TextUtils;
+import android.util.AttributeSet;
+import android.util.Property;
+import android.view.View;
+import android.view.View.OnClickListener;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.chrome.browser.LogoBridge.Logo;
+import org.chromium.chrome.browser.ntp.NewTabPageView.NewTabPageManager;
+
+import java.lang.ref.WeakReference;
+
+/**
+ * This view shows the default search provider's logo and fades in a new logo if one becomes
+ * available.
+ */
+public class LogoView extends View implements OnClickListener {
+
+    // Number of milliseconds for a new logo to fade in.
+    private static final int LOGO_TRANSITION_TIME_MS = 400;
+
+    // The default logo is shared across all NTPs.
+    private static WeakReference<Bitmap> sDefaultLogo;
+
+    private Paint mPaint;
+    private Bitmap mLogo;
+    private Bitmap mNewLogo;
+    private Matrix mLogoMatrix;
+    private Matrix mNewLogoMatrix;
+    private boolean mLogoIsDefault;
+    private boolean mNewLogoIsDefault;
+    private ObjectAnimator mAnimation;
+
+    /**
+     * A measure from 0 to 1 of how much the new logo has faded in. 0 shows the old logo, 1 shows
+     * the new logo, and intermediate values show the new logo cross-fading in over the old logo.
+     * Set to 0 when not transitioning.
+     */
+    private float mTransitionAmount;
+
+    private NewTabPageManager mManager;
+
+    private final Property<LogoView, Float> mTransitionProperty =
+            new Property<LogoView, Float>(Float.class, "") {
+        @Override
+        public Float get(LogoView logoView) {
+            return logoView.mTransitionAmount;
+        }
+
+        @Override
+        public void set(LogoView logoView, Float amount) {
+            assert amount >= 0f;
+            assert amount <= 1f;
+            if (logoView.mTransitionAmount != amount) {
+                logoView.mTransitionAmount = amount;
+                invalidate();
+            }
+        }
+    };
+
+    /**
+     * Constructor used to inflate a LogoView from XML.
+     */
+    public LogoView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        mLogo = getDefaultLogo();
+        mLogoMatrix = new Matrix();
+        mLogoIsDefault = true;
+
+        mPaint = new Paint();
+        mPaint.setFilterBitmap(true);
+
+        // Mark this view as non-clickable so that accessibility will ignore it. When a non-default
+        // logo is shown, this view will be marked clickable again.
+        setOnClickListener(this);
+        setClickable(false);
+    }
+
+    /**
+     * Sets the NewTabPageManager to notify when the logo is pressed.
+     */
+    public void setMananger(NewTabPageManager manager) {
+        mManager = manager;
+    }
+
+    /**
+     * Jumps to the end of the current logo animation, if any.
+     */
+    public void endAnimation() {
+        if (mAnimation != null) {
+            mAnimation.end();
+            mAnimation = null;
+        }
+    }
+
+    /**
+     * Fades in a new logo over the current logo.
+     *
+     * @param logo The new logo to fade in. May be null to reset to the default logo.
+     */
+    public void updateLogo(Logo logo) {
+        if (logo == null) {
+            updateLogo(getDefaultLogo(), null, true);
+        } else {
+            String contentDescription = TextUtils.isEmpty(logo.altText) ? null
+                    : getResources().getString(R.string.accessibility_google_doodle, logo.altText);
+            updateLogo(logo.image, contentDescription, false);
+        }
+    }
+
+    private void updateLogo(Bitmap logo, final String contentDescription, boolean isDefaultLogo) {
+        if (mAnimation != null) mAnimation.end();
+
+        mNewLogo = logo;
+        mNewLogoMatrix = new Matrix();
+        mNewLogoIsDefault = isDefaultLogo;
+        setMatrix(mNewLogo, mNewLogoMatrix, mNewLogoIsDefault);
+
+        mAnimation = ObjectAnimator.ofFloat(this, mTransitionProperty, 0f, 1f);
+        mAnimation.setDuration(LOGO_TRANSITION_TIME_MS);
+        mAnimation.addListener(new Animator.AnimatorListener() {
+            @Override
+            public void onAnimationStart(Animator animation) {
+            }
+
+            @Override
+            public void onAnimationRepeat(Animator animation) {
+            }
+
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                mLogo = mNewLogo;
+                mLogoMatrix = mNewLogoMatrix;
+                mLogoIsDefault = mNewLogoIsDefault;
+                mNewLogo = null;
+                mNewLogoMatrix = null;
+                mTransitionAmount = 0f;
+                mAnimation = null;
+                setContentDescription(contentDescription);
+                setClickable(!mNewLogoIsDefault);
+            }
+
+            @Override
+            public void onAnimationCancel(Animator animation) {
+                onAnimationEnd(animation);
+                invalidate();
+            }
+        });
+        mAnimation.start();
+    }
+
+    /**
+     * @return Whether a new logo is currently fading in over the old logo.
+     */
+    private boolean isTransitioning() {
+        return mTransitionAmount != 0f;
+    }
+
+    /**
+     * Sets the matrix to scale and translate the image so that it will be centered in the LogoView
+     * and scaled to fit within the LogoView.
+     *
+     * @param preventUpscaling Whether the image should not be scaled up. If true, the image might
+     *                         not fill the entire view but will still be centered.
+     */
+    private void setMatrix(Bitmap image, Matrix matrix, boolean preventUpscaling) {
+        int width = getWidth();
+        int height = getHeight();
+        int imageWidth = image.getWidth();
+        int imageHeight = image.getHeight();
+
+        float scale = Math.min((float) width / imageWidth, (float) height / imageHeight);
+        if (preventUpscaling) scale = Math.min(1.0f, scale);
+
+        int imageOffsetX = Math.round((width - imageWidth * scale) * 0.5f);
+        int imageOffsetY = Math.round((height - imageHeight * scale) * 0.5f);
+
+        matrix.setScale(scale, scale);
+        matrix.postTranslate(imageOffsetX, imageOffsetY);
+    }
+
+    /**
+     * @return The default logo.
+     */
+    private Bitmap getDefaultLogo() {
+        Bitmap defaultLogo = sDefaultLogo == null ? null : sDefaultLogo.get();
+        if (defaultLogo == null) {
+            defaultLogo = BitmapFactory.decodeResource(getResources(), R.drawable.google_logo);
+            sDefaultLogo = new WeakReference<Bitmap>(defaultLogo);
+        }
+        return defaultLogo;
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (mLogo != null && mTransitionAmount < 0.5f) {
+            mPaint.setAlpha((int) (255 * 2 * (0.5f - mTransitionAmount)));
+            canvas.save();
+            canvas.concat(mLogoMatrix);
+            canvas.drawBitmap(mLogo, 0, 0, mPaint);
+            canvas.restore();
+        }
+
+        if (mNewLogo != null && mTransitionAmount > 0.5f) {
+            mPaint.setAlpha((int) (255 * 2 * (mTransitionAmount - 0.5f)));
+            canvas.save();
+            canvas.concat(mNewLogoMatrix);
+            canvas.drawBitmap(mNewLogo, 0, 0, mPaint);
+            canvas.restore();
+        }
+    }
+
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        if (w != oldw || h != oldh) {
+            if (mLogo != null) setMatrix(mLogo, mLogoMatrix, mLogoIsDefault);
+            if (mNewLogo != null) setMatrix(mNewLogo, mNewLogoMatrix, mNewLogoIsDefault);
+        }
+    }
+
+    @Override
+    public void onClick(View view) {
+        if (view == this && mManager != null && !isTransitioning()) {
+            mManager.openLogoLink();
+        }
+    }
+}