Add download label view

app/src/main/java/com/hippo/widget/DrawView.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2016 Hippo Seven
+ *
+ * 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.hippo.widget;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.util.AttributeSet;
+import android.widget.FrameLayout;
+
+import com.hippo.yorozuya.LayoutUtils;
+
+public class DrawView extends FrameLayout {
+
+    private static final int DEFAULT_MAX_WIDTH = 280;
+
+    private static final int[] SIZE_ATTRS = new int[] {
+            android.R.attr.maxWidth
+    };
+
+    private int mMaxWidth;
+
+    public DrawView(Context context) {
+        super(context);
+        init(context, null);
+    }
+
+    public DrawView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs);
+    }
+
+    public DrawView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init(context, attrs);
+    }
+
+    private void init(Context context, AttributeSet attrs) {
+        TypedArray a = context.obtainStyledAttributes(attrs, SIZE_ATTRS);
+        mMaxWidth = a.getDimensionPixelOffset(0, LayoutUtils.dp2pix(context, DEFAULT_MAX_WIDTH));
+        a.recycle();
+    }
+
+    @Override
+    protected void onMeasure(int widthSpec, int heightSpec) {
+        switch (MeasureSpec.getMode(widthSpec)) {
+            case MeasureSpec.EXACTLY:
+                // Nothing to do
+                break;
+            case MeasureSpec.AT_MOST:
+                widthSpec = MeasureSpec.makeMeasureSpec(
+                        Math.min(MeasureSpec.getSize(widthSpec), mMaxWidth), MeasureSpec.EXACTLY);
+                break;
+            case MeasureSpec.UNSPECIFIED:
+                widthSpec = MeasureSpec.makeMeasureSpec(mMaxWidth, MeasureSpec.EXACTLY);
+                break;
+        }
+        // Let super sort out the height
+        super.onMeasure(widthSpec, heightSpec);
+    }
+}