Adding an interface to allow adding custom views in FloatingHeaderView

Bug: 109828640
Change-Id: I9bde5d4fab47eb3e5787bbb741b5b9051a15c0c2

src/com/android/launcher3/allapps/PluginHeaderRow.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.launcher3.allapps;
+
+import static android.view.View.ALPHA;
+import static android.view.View.INVISIBLE;
+import static android.view.View.VISIBLE;
+
+import android.graphics.Rect;
+import android.view.View;
+import android.view.animation.Interpolator;
+
+import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.anim.PropertySetter;
+import com.android.systemui.plugins.AllAppsRow;
+
+/**
+ * Wrapper over an {@link AllAppsRow} plugin with {@link FloatingHeaderRow} interface so that
+ * it can be easily added in {@link FloatingHeaderView}.
+ */
+public class PluginHeaderRow implements FloatingHeaderRow {
+
+    private final AllAppsRow mPlugin;
+    final View mView;
+
+    PluginHeaderRow(AllAppsRow plugin, FloatingHeaderView parent) {
+        mPlugin = plugin;
+        mView = mPlugin.setup(parent);
+    }
+
+    @Override
+    public void setup(FloatingHeaderView parent, FloatingHeaderRow[] allRows,
+            boolean tabsHidden) { }
+
+    @Override
+    public void setInsets(Rect insets, DeviceProfile grid) { }
+
+    @Override
+    public int getExpectedHeight() {
+        return mPlugin.getExpectedHeight();
+    }
+
+    @Override
+    public boolean shouldDraw() {
+        return true;
+    }
+
+    @Override
+    public boolean hasVisibleContent() {
+        return true;
+    }
+
+    @Override
+    public void setContentVisibility(boolean hasHeaderExtra, boolean hasContent,
+            PropertySetter setter, Interpolator fadeInterpolator) {
+        // Don't use setViewAlpha as we want to control the visibility ourselves.
+        setter.setFloat(mView, ALPHA, hasContent ? 1 : 0, fadeInterpolator);
+    }
+
+    @Override
+    public void setVerticalScroll(int scroll, boolean isScrolledOut) {
+        mView.setVisibility(isScrolledOut ? INVISIBLE : VISIBLE);
+        if (!isScrolledOut) {
+            mView.setTranslationY(scroll);
+        }
+    }
+
+    @Override
+    public Class<PluginHeaderRow> getTypeClass() {
+        return PluginHeaderRow.class;
+    }
+}