Add contrast pill to workspace apps

When the flag is enabled, allow the BubbleTextView to draw a background
pill behind the app title. Also change the color of the text to properly
ensure contrast.  The contrast pill is only enabled for workpace apps,
so attempt draw the pill only for DoubleShadowBubbleTextView elements.

Bug: 341217082
Flag: com.android.launcher3.enable_contrast_tiles
Test: Manual, visual change
Change-Id: Idce27bd8dfca4b525c762fcd0873562f31b45b8f

src/com/android/launcher3/BubbleTextView.java

@@ -20,6 +20,7 @@ import static android.graphics.fonts.FontStyle.FONT_WEIGHT_BOLD;
 import static android.graphics.fonts.FontStyle.FONT_WEIGHT_NORMAL;
 import static android.text.Layout.Alignment.ALIGN_NORMAL;
 
+import static com.android.launcher3.Flags.enableContrastTiles;
 import static com.android.launcher3.Flags.enableCursorHoverStates;
 import static com.android.launcher3.graphics.PreloadIconDrawable.newPendingIcon;
 import static com.android.launcher3.icons.BitmapInfo.FLAG_NO_BADGE;
@@ -39,6 +40,7 @@ import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Rect;
+import android.graphics.RectF;
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
 import android.icu.text.MessageFormat;
@@ -722,6 +724,29 @@ public class BubbleTextView extends TextView implements ItemInfoUpdateReceiver,
         }
     }
 
+    /** Draws a background behind the App Title label when required. **/
+    public void drawAppContrastTile(Canvas canvas) {
+        RectF appTitleBounds;
+        Paint.FontMetrics fm = getPaint().getFontMetrics();
+        Rect tmpRect = new Rect();
+        getDrawingRect(tmpRect);
+
+        if (mIcon == null) {
+            appTitleBounds = new RectF(0, 0, tmpRect.right,
+                    (int) Math.ceil(fm.bottom - fm.top));
+        } else {
+            Rect iconBounds = new Rect();
+            getIconBounds(iconBounds);
+            int textStart = iconBounds.bottom + getCompoundDrawablePadding();
+            appTitleBounds = new RectF(tmpRect.left, textStart, tmpRect.right,
+                    textStart + (int) Math.ceil(fm.bottom - fm.top));
+        }
+
+        canvas.drawRoundRect(appTitleBounds, appTitleBounds.height() / 2,
+                appTitleBounds.height() / 2,
+                PillColorProvider.getInstance(getContext()).getAppTitlePillPaint());
+    }
+
     /** Draws a line under the app icon if this is representing a running app in Desktop Mode. */
     protected void drawRunningAppIndicatorIfNecessary(Canvas canvas) {
         if (mRunningAppState == RunningAppState.NOT_RUNNING || mDisplay != DISPLAY_TASKBAR) {
@@ -909,7 +934,9 @@ public class BubbleTextView extends TextView implements ItemInfoUpdateReceiver,
 
     @Override
     public void setTextColor(ColorStateList colors) {
-        mTextColor = colors.getDefaultColor();
+        mTextColor = shouldDrawAppContrastTile() ? PillColorProvider.getInstance(
+                getContext()).getAppTitleTextPaint().getColor()
+                : colors.getDefaultColor();
         mTextColorStateList = colors;
         if (Float.compare(mTextAlpha, 1) == 0) {
             super.setTextColor(colors);
@@ -926,6 +953,15 @@ public class BubbleTextView extends TextView implements ItemInfoUpdateReceiver,
                 && info.container != LauncherSettings.Favorites.CONTAINER_HOTSEAT_PREDICTION);
     }
 
+    /**
+     * Whether or not an App title contrast tile should be drawn for this element.
+     **/
+    public boolean shouldDrawAppContrastTile() {
+        return mDisplay == DISPLAY_WORKSPACE && shouldTextBeVisible()
+                && PillColorProvider.getInstance(getContext()).isMatchaEnabled()
+                && enableContrastTiles();
+    }
+
     public void setTextVisibility(boolean visible) {
         setTextAlpha(visible ? 1 : 0);
     }