Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/toolbar/TabSwitcherDrawable.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.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Paint.Align;
+import android.graphics.Rect;
+import android.graphics.Typeface;
+import android.text.TextPaint;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.base.VisibleForTesting;
+import org.chromium.chrome.browser.widget.TintedDrawable;
+
+import java.util.Locale;
+
+/**
+ * A drawable for the tab switcher icon.
+ */
+public class TabSwitcherDrawable extends TintedDrawable {
+    private final float mSingleDigitTextSize;
+    private final float mDoubleDigitTextSize;
+
+    private final Rect mTextBounds = new Rect();
+    private final TextPaint mTextPaint;
+
+    // Tab Count Label
+    private int mTabCount;
+    private boolean mIncognito;
+
+    /**
+     * Creates a {@link TabSwitcherDrawable}.
+     * @param resources A {@link Resources} instance.
+     * @param useLight  Whether or not to use light or dark textures and text colors.
+     * @return          A {@link TabSwitcherDrawable} instance.
+     */
+    public static TabSwitcherDrawable createTabSwitcherDrawable(
+            Resources resources, boolean useLight) {
+        Bitmap icon = BitmapFactory.decodeResource(resources, R.drawable.btn_tabswitcher);
+        return new TabSwitcherDrawable(resources, useLight, icon);
+    }
+
+    private TabSwitcherDrawable(Resources resources, boolean useLight, Bitmap bitmap) {
+        super(resources, bitmap);
+        setTint(resources.getColorStateList(useLight ? R.color.light_mode_tint
+                : R.color.dark_mode_tint));
+        mSingleDigitTextSize =
+                resources.getDimension(R.dimen.toolbar_tab_count_text_size_1_digit);
+        mDoubleDigitTextSize =
+                resources.getDimension(R.dimen.toolbar_tab_count_text_size_2_digit);
+
+        mTextPaint = new TextPaint();
+        mTextPaint.setAntiAlias(true);
+        mTextPaint.setTextAlign(Align.CENTER);
+        mTextPaint.setTypeface(Typeface.create("sans-serif-condensed", Typeface.BOLD));
+        mTextPaint.setColor(getColorForState());
+    }
+
+    @Override
+    protected boolean onStateChange(int[] state) {
+        boolean retVal = super.onStateChange(state);
+        if (retVal) mTextPaint.setColor(getColorForState());
+        return retVal;
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        super.draw(canvas);
+
+        String textString = getTabCountString();
+        if (!textString.isEmpty()) {
+            mTextPaint.getTextBounds(textString, 0, textString.length(), mTextBounds);
+
+            Rect drawableBounds = getBounds();
+            int textX = drawableBounds.width() / 2;
+            int textY = drawableBounds.height() / 2 + (mTextBounds.bottom - mTextBounds.top) / 2
+                    - mTextBounds.bottom;
+
+            canvas.drawText(textString, textX, textY, mTextPaint);
+        }
+    }
+
+    /**
+     * @return The current tab count this drawable is displaying.
+     */
+    @VisibleForTesting
+    public int getTabCount() {
+        return mTabCount;
+    }
+
+    /**
+     * Update the visual state based on the number of tabs present.
+     * @param tabCount The number of tabs.
+     */
+    public void updateForTabCount(int tabCount, boolean incognito) {
+        if (tabCount == mTabCount && incognito == mIncognito) return;
+        mTabCount = tabCount;
+        mIncognito = incognito;
+        float textSizePx = mTabCount > 9 ? mDoubleDigitTextSize : mSingleDigitTextSize;
+        mTextPaint.setTextSize(textSizePx);
+        invalidateSelf();
+    }
+
+    private String getTabCountString() {
+        if (mTabCount <= 0) {
+            return "";
+        } else if (mTabCount > 99) {
+            return mIncognito ? ";)" : ":D";
+        } else {
+            return String.format(Locale.getDefault(), "%d", mTabCount);
+        }
+    }
+
+    private int getColorForState() {
+        return mTint.getColorForState(getState(), 0);
+    }
+}