ClipImageBorderView.java

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2015 Umeng, Inc
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.umeng.comm.ui.widgets;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

import com.umeng.comm.core.utils.ResFinder;

/**
 * 图片裁剪面板
 */
public class ClipImageBorderView extends View {
    /**
     * 水平方向与View的边距
     */
    private int mHorizontalPadding;
    /**
     * 垂直方向与View的边距
     */
    private int mVerticalPadding;
    /**
     * 绘制的矩形的宽度
     */
    private int mWidth;
    /**
     * 边框的颜色，默认为白色
     */
    private int mBorderColor = Color.WHITE;
    /**
     * 边框的宽度 单位dp
     */
    private int mBorderWidth = 1;

    private Paint mPaint;

    private int mColor = 0;

    public ClipImageBorderView(Context context) {
        this(context, null);
    }

    public ClipImageBorderView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public ClipImageBorderView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        mBorderWidth = (int) TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP, mBorderWidth, getResources()
                        .getDisplayMetrics());
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        // 计算矩形区域的宽度
        mWidth = getWidth() - 2 * mHorizontalPadding;
        // 计算距离屏幕垂直边界 的边距
        mVerticalPadding = (getHeight() - mWidth) / 2;
        if (mColor == 0) {
            mColor = ResFinder.getColor("umeng_comm_clip_image_paint");
        }
        mPaint.setColor(mColor);
        mPaint.setStyle(Style.FILL);
        // 绘制左边1
        canvas.drawRect(0, 0, mHorizontalPadding, getHeight(), mPaint);
        // 绘制右边2
        canvas.drawRect(getWidth() - mHorizontalPadding, 0, getWidth(),
                getHeight(), mPaint);
        // 绘制上边3
        canvas.drawRect(mHorizontalPadding, 0, getWidth() - mHorizontalPadding,
                mVerticalPadding, mPaint);
        // 绘制下边4
        canvas.drawRect(mHorizontalPadding, getHeight() - mVerticalPadding,
                getWidth() - mHorizontalPadding, getHeight(), mPaint);
        // 绘制外边框
        mPaint.setColor(mBorderColor);
        mPaint.setStrokeWidth(mBorderWidth);
        mPaint.setStyle(Style.STROKE);
        canvas.drawRect(mHorizontalPadding, mVerticalPadding, getWidth()
                - mHorizontalPadding, getHeight() - mVerticalPadding, mPaint);

    }

    public void setHorizontalPadding(int mHorizontalPadding) {
        this.mHorizontalPadding = mHorizontalPadding;
    }

}