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app/src/main/java/com/hippo/ehviewer/widget/SimpleRatingView.java

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+/*
+ * Copyright (C) 2015 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.ehviewer.widget;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Canvas;
+import android.graphics.drawable.Drawable;
+import android.util.AttributeSet;
+import android.view.View;
+
+import com.hippo.ehviewer.R;
+
+public class SimpleRatingView extends View {
+
+    private Drawable mStarDrawable;
+    private Drawable mStarHalfDrawable;
+    private Drawable mStarOutlineDrawable;
+    private int mRatingSize;
+    private int mRatingInterval;
+
+    private float mRating;
+    private int mRatingInt;
+
+    public SimpleRatingView(Context context) {
+        super(context);
+        init(context);
+    }
+
+    public SimpleRatingView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context);
+    }
+
+    public SimpleRatingView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init(context);
+    }
+
+    private void init(Context context) {
+        Resources resources = context.getResources();
+        mStarDrawable = resources.getDrawable(R.drawable.ic_star_x16);
+        mStarHalfDrawable = resources.getDrawable(R.drawable.ic_star_half_x16);
+        mStarOutlineDrawable = resources.getDrawable(R.drawable.ic_star_outline_x16);
+        mRatingSize = resources.getDimensionPixelOffset(R.dimen.rating_size);
+        mRatingInterval = resources.getDimensionPixelOffset(R.dimen.rating_interval);
+
+        mStarDrawable.setBounds(0, 0, mRatingSize, mRatingSize);
+        mStarHalfDrawable.setBounds(0, 0, mRatingSize, mRatingSize);
+        mStarOutlineDrawable.setBounds(0, 0, mRatingSize, mRatingSize);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        setMeasuredDimension(mRatingSize * 5 + mRatingInterval * 4, mRatingSize);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        int ratingInt = mRatingInt;
+        int step = mRatingSize + mRatingInterval;
+        int numStar = ratingInt / 2;
+        int numStarHalf = ratingInt % 2;
+        int saved = canvas.save();
+        while (numStar-- > 0) {
+            mStarDrawable.draw(canvas);
+            canvas.translate(step, 0);
+        }
+        if (numStarHalf == 1) {
+            mStarHalfDrawable.draw(canvas);
+            canvas.translate(step, 0);
+        }
+        int numOutline = 5 - numStar - numStarHalf;
+        while (numOutline-- > 0) {
+            mStarOutlineDrawable.draw(canvas);
+            canvas.translate(step, 0);
+        }
+        canvas.restoreToCount(saved);
+    }
+
+    public void setRating(float rating) {
+        if (mRating != rating) {
+            mRating = rating;
+            int ratingInt = (int) Math.ceil(rating * 2);
+            if (mRatingInt != ratingInt) {
+                mRatingInt = ratingInt;
+                invalidate();
+            }
+        }
+    }
+
+    public float getRating() {
+        return mRating;
+    }
+}