Misc clean up. move widgets from graph to widget package.

Bug: n/a
Test: robotests, rebuild
Change-Id: I910f355312d52e81a0bf57b46a3f267e1eb9882a

src/com/android/settings/widget/BottomLabelLayout.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2017 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.settings.widget;
+
+import android.annotation.Nullable;
+import android.content.Context;
+import androidx.annotation.VisibleForTesting;
+import android.util.AttributeSet;
+import android.view.Gravity;
+import android.view.View;
+import android.widget.LinearLayout;
+
+import com.android.settingslib.R;
+
+/**
+ * An extension of LinearLayout that automatically switches to vertical
+ * orientation when it can't fit its child views horizontally.
+ *
+ * Main logic in this class comes from {@link androidx.appcompat.widget.ButtonBarLayout}.
+ * Compared with {@link androidx.appcompat.widget.ButtonBarLayout}, this layout won't reverse
+ * children's order and won't update the minimum height
+ */
+public class BottomLabelLayout extends LinearLayout {
+    private static final String TAG = "BottomLabelLayout";
+
+    public BottomLabelLayout(Context context,
+            @Nullable AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
+        final boolean isStacked = isStacked();
+        boolean needsRemeasure = false;
+
+        // If we're not stacked, make sure the measure spec is AT_MOST rather
+        // than EXACTLY. This ensures that we'll still get TOO_SMALL so that we
+        // know to stack the buttons.
+        final int initialWidthMeasureSpec;
+        if (!isStacked && MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY) {
+            initialWidthMeasureSpec = MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.AT_MOST);
+
+            // We'll need to remeasure again to fill excess space.
+            needsRemeasure = true;
+        } else {
+            initialWidthMeasureSpec = widthMeasureSpec;
+        }
+
+        super.onMeasure(initialWidthMeasureSpec, heightMeasureSpec);
+        if (!isStacked) {
+            final int measuredWidth = getMeasuredWidthAndState();
+            final int measuredWidthState = measuredWidth & View.MEASURED_STATE_MASK;
+
+            if (measuredWidthState == View.MEASURED_STATE_TOO_SMALL) {
+                setStacked(true);
+                // Measure again in the new orientation.
+                needsRemeasure = true;
+            }
+        }
+
+        if (needsRemeasure) {
+            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        }
+
+    }
+
+    @VisibleForTesting
+    void setStacked(boolean stacked) {
+        setOrientation(stacked ? LinearLayout.VERTICAL : LinearLayout.HORIZONTAL);
+        setGravity(stacked ? Gravity.START : Gravity.BOTTOM);
+
+        final View spacer = findViewById(R.id.spacer);
+        if (spacer != null) {
+            spacer.setVisibility(stacked ? View.GONE : View.VISIBLE);
+        }
+    }
+
+    private boolean isStacked() {
+        return getOrientation() == LinearLayout.VERTICAL;
+    }
+}