1 files changed, 116 insertions, 0 deletions
diff --git a/androidx/car/widget/ColumnCardView.java b/androidx/car/widget/ColumnCardView.java
new file mode 100644
index 00000000..9ec2bb65
--- /dev/null
+++ b/androidx/car/widget/ColumnCardView.java
@@ -0,0 +1,116 @@
+/*
+ * 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 androidx.car.widget;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.support.v7.widget.CardView;
+import android.util.AttributeSet;
+import android.util.Log;
+
+import androidx.car.R;
+import androidx.car.utils.ColumnCalculator;
+
+/**
+ * A {@link CardView} whose width can be specified by the number of columns that it will span.
+ *
+ * <p>The {@code ColumnCardView} works similarly to a regular {@link CardView}, except that
+ * its {@code layout_width} attribute is always ignored. Instead, its width is automatically
+ * calculated based on a specified {@code columnSpan} attribute. Alternatively, a user can call
+ * {@link #setColumnSpan(int)}. If no column span is given, the {@code ColumnCardView} will have
+ * a default span value that it uses.
+ *
+ * <pre>
+ * &lt;androidx.car.widget.ColumnCardView
+ *     android:layout_width="wrap_content"
+ *     android:layout_height="wrap_content"
+ *     app:columnSpan="4" /&gt;
+ * </pre>
+ *
+ * @see ColumnCalculator
+ */
+public final class ColumnCardView extends CardView {
+    private static final String TAG = "ColumnCardView";
+
+    private ColumnCalculator mColumnCalculator;
+    private int mColumnSpan;
+
+    public ColumnCardView(Context context) {
+        super(context);
+        init(context, null, 0 /* defStyleAttrs */);
+    }
+
+    public ColumnCardView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs, 0 /* defStyleAttrs */);
+    }
+
+    public ColumnCardView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init(context, attrs, defStyleAttr);
+    }
+
+    private void init(Context context, AttributeSet attrs, int defStyleAttrs) {
+        mColumnCalculator = ColumnCalculator.getInstance(context);
+
+        int defaultColumnSpan = getResources().getInteger(
+                R.integer.column_card_default_column_span);
+
+        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.ColumnCardView,
+                defStyleAttrs, 0 /* defStyleRes */);
+        mColumnSpan = ta.getInteger(R.styleable.ColumnCardView_columnSpan, defaultColumnSpan);
+        ta.recycle();
+
+        if (Log.isLoggable(TAG, Log.DEBUG)) {
+            Log.d(TAG, "Column span: " + mColumnSpan);
+        }
+    }
+
+    @Override
+    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        // Override any specified width so that the width is one that is calculated based on
+        // column and gutter span.
+        int width = mColumnCalculator.getSizeForColumnSpan(mColumnSpan);
+        super.onMeasure(
+                MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
+                heightMeasureSpec);
+    }
+
+    /**
+     * Sets the number of columns that this {@code ColumnCardView} will span. The given span is
+     * ignored if it is less than 0 or greater than the number of columns that fit on screen.
+     *
+     * @param columnSpan The number of columns this {@code ColumnCardView} will span across.
+     */
+    public void setColumnSpan(int columnSpan) {
+        if (columnSpan <= 0 || columnSpan > mColumnCalculator.getNumOfColumns()) {
+            return;
+        }
+
+        mColumnSpan = columnSpan;
+        requestLayout();
+    }
+
+    /**
+     * Returns the currently number of columns that this {@code ColumnCardView} spans.
+     *
+     * @return The number of columns this {@code ColumnCardView} spans across.
+     */
+    public int getColumnSpan() {
+        return mColumnSpan;
+    }
+}