428 lines
14 KiB
Java
428 lines
14 KiB
Java
package com.gh.common.view;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Matrix;
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import android.graphics.RectF;
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import android.graphics.drawable.Drawable;
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import android.util.AttributeSet;
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import android.view.GestureDetector;
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import android.view.GestureDetector.SimpleOnGestureListener;
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import android.view.MotionEvent;
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import android.view.ScaleGestureDetector;
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import android.view.ScaleGestureDetector.OnScaleGestureListener;
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import android.view.View;
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import android.view.View.OnTouchListener;
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import android.view.ViewTreeObserver;
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import androidx.appcompat.widget.AppCompatImageView;
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@SuppressWarnings("deprecation")
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public class CropImageZoomView extends AppCompatImageView implements
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OnScaleGestureListener, OnTouchListener,
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ViewTreeObserver.OnGlobalLayoutListener {
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public static float SCALE_MAX = 4.0f;
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private static float SCALE_MID = 2.0f;
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/**
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* 用于存放矩阵的9个值
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*/
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private final float[] matrixValues = new float[9];
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private final Matrix mScaleMatrix = new Matrix();
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/**
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* 初始化时的缩放比例，如果图片宽或高大于屏幕，此值将小于0
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*/
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private float initScale = 1.0f;
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private boolean once = true;
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/**
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* 缩放的手势检测
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*/
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private ScaleGestureDetector mScaleGestureDetector = null;
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/**
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* 用于双击检测
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*/
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private GestureDetector mGestureDetector;
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private boolean isAutoScale;
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private int mTouchSlop;
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private float mLastX;
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private float mLastY;
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private boolean isCanDrag;
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private int lastPointerCount;
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/**
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* 水平方向与View的边距
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*/
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private int mHorizontalPadding;// ——屏幕边缘离截图区的宽度
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/**
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* 垂直方向与View的边距
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*/
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private int mVerticalPadding;// ——屏幕顶部离截图区的高度
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private float mRatio = 1; // 宽高比
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private int mWidth;
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public CropImageZoomView(Context context) {
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this(context, null);
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}
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public CropImageZoomView(Context context, AttributeSet attrs) {
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super(context, attrs);
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setScaleType(ScaleType.MATRIX);
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mGestureDetector = new GestureDetector(context,
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new SimpleOnGestureListener() {
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@Override
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public boolean onDoubleTap(MotionEvent e) {
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if (isAutoScale == true)
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return true;
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float x = e.getX();
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float y = e.getY();
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if (getScale() < SCALE_MID) {
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CropImageZoomView.this.postDelayed(
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new AutoScaleRunnable(SCALE_MID, x, y), 16);
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isAutoScale = true;
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} else {
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CropImageZoomView.this.postDelayed(
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new AutoScaleRunnable(initScale, x, y), 16);
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isAutoScale = true;
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}
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return true;
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}
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});
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mScaleGestureDetector = new ScaleGestureDetector(context, this);
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this.setOnTouchListener(this);
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}
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/**
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* 获得当前的缩放比例
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*
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* @return
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*/
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public final float getScale() {
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mScaleMatrix.getValues(matrixValues);
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return matrixValues[Matrix.MSCALE_X];
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}
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@Override
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public boolean onScale(ScaleGestureDetector detector) {
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float scale = getScale();
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float scaleFactor = detector.getScaleFactor();
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if (getDrawable() == null)
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return true;
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/**
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* 缩放的范围控制
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*/
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if ((scale < SCALE_MAX && scaleFactor > 1.0f)
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|| (scale > initScale && scaleFactor < 1.0f)) {
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/**
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* 最大值最小值判断
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*/
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if (scaleFactor * scale < initScale) {
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scaleFactor = initScale / scale;
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}
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if (scaleFactor * scale > SCALE_MAX) {
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scaleFactor = SCALE_MAX / scale;
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}
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/**
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* 设置缩放比例
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*/
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mScaleMatrix.postScale(scaleFactor, scaleFactor,
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detector.getFocusX(), detector.getFocusY());
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checkBorder();
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setImageMatrix(mScaleMatrix);
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}
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return true;
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}
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@Override
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public boolean onScaleBegin(ScaleGestureDetector detector) {
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return true;
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}
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@Override
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public void onScaleEnd(ScaleGestureDetector detector) {
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}
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/**
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* 边界检测
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*/
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private void checkBorder() {
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RectF rect = getMatrixRectF();
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float deltaX = 0;
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float deltaY = 0;
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int width = getWidth();
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int height = getHeight();
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// 如果宽或高大于屏幕，则控制范围 ; 这里的0.001是因为精度丢失会产生问题，但是误差一般很小，所以我们直接加了一个0.01
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if (rect.width() + 0.01 >= width - 2 * mHorizontalPadding) {
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if (rect.left > mHorizontalPadding) {
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deltaX = -rect.left + mHorizontalPadding;
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}
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if (rect.right < width - mHorizontalPadding) {
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deltaX = width - mHorizontalPadding - rect.right;
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}
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}
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if (rect.height() + 0.01 >= height - 2 * mVerticalPadding) {
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if (rect.top > mVerticalPadding) {
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deltaY = -rect.top + mVerticalPadding;
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}
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if (rect.bottom < height - mVerticalPadding) {
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deltaY = height - mVerticalPadding - rect.bottom;
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}
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}
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mScaleMatrix.postTranslate(deltaX, deltaY);
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}
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/**
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* 根据当前图片的Matrix获得图片的范围
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*
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* @return
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*/
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private RectF getMatrixRectF() {
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Matrix matrix = mScaleMatrix;
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RectF rect = new RectF();
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Drawable d = getDrawable();
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if (null != d) {
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rect.set(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
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matrix.mapRect(rect);
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}
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return rect;
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}
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@Override
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public boolean onTouch(View v, MotionEvent event) {
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if (mGestureDetector.onTouchEvent(event))
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return true;
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mScaleGestureDetector.onTouchEvent(event);
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float x = 0, y = 0;
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// 拿到触摸点的个数
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final int pointerCount = event.getPointerCount();
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// 得到多个触摸点的x与y均值
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for (int i = 0; i < pointerCount; i++) {
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x += event.getX(i);
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y += event.getY(i);
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}
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x = x / pointerCount;
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y = y / pointerCount;
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/**
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* 每当触摸点发生变化时，重置mLasX , mLastY
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*/
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if (pointerCount != lastPointerCount) {
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isCanDrag = false;
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mLastX = x;
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mLastY = y;
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}
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lastPointerCount = pointerCount;
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switch (event.getAction()) {
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case MotionEvent.ACTION_MOVE:
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float dx = x - mLastX;
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float dy = y - mLastY;
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if (!isCanDrag) {
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isCanDrag = isCanDrag(dx, dy);
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}
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if (isCanDrag) {
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if (getDrawable() != null) {
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RectF rectF = getMatrixRectF();
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// 如果宽度小于屏幕宽度，则禁止左右移动
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if (rectF.width() <= getWidth() - mHorizontalPadding * 2) {
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dx = 0;
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}
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// 如果高度小雨屏幕高度，则禁止上下移动
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if (rectF.height() <= getHeight() - mVerticalPadding * 2) {
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dy = 0;
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}
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mScaleMatrix.postTranslate(dx, dy);
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checkBorder();
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setImageMatrix(mScaleMatrix);
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}
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}
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mLastX = x;
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mLastY = y;
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break;
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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lastPointerCount = 0;
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break;
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}
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return true;
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}
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/**
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* 是否是拖动行为
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*
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* @param dx
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* @param dy
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* @return
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*/
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private boolean isCanDrag(float dx, float dy) {
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return Math.sqrt((dx * dx) + (dy * dy)) >= mTouchSlop;
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}
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@Override
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protected void onAttachedToWindow() {
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super.onAttachedToWindow();
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getViewTreeObserver().addOnGlobalLayoutListener(this);
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}
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@Override
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protected void onDetachedFromWindow() {
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super.onDetachedFromWindow();
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getViewTreeObserver().removeGlobalOnLayoutListener(this);
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}
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@Override
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public void onGlobalLayout() {
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if (once) {
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Drawable d = getDrawable();
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if (d == null)
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return;
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mWidth = getWidth() - 2 * mHorizontalPadding;
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// 垂直方向的边距
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mVerticalPadding = (getHeight() - (int) (mWidth * mRatio)) / 2;
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int width = getWidth();
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int height = getHeight();
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// 拿到图片的宽和高
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int dw = d.getIntrinsicWidth();
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int dh = d.getIntrinsicHeight();
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float scale = 1.0f;
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if (dw <= getWidth() - mHorizontalPadding * 2
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&& dh >= getHeight() - mVerticalPadding * 2) {// 如果图片的宽度<截图区宽度，并且图片高度>截图区高度时
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scale = (getWidth() * 1.0f - mHorizontalPadding * 2) / dw;
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}
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if (dh <= getHeight() - mVerticalPadding * 2
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&& dw >= getWidth() - mHorizontalPadding * 2) {// 如果图片的高度<截图区高度，并且图片宽度>截图区宽度时
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scale = (getHeight() * 1.0f - mVerticalPadding * 2) / dh;
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}
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if (dw <= getWidth() - mHorizontalPadding * 2
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&& dh <= getHeight() - mVerticalPadding * 2) {// 如果图片的高度<截图区高度，并且图片宽度<截图区宽度时
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float scaleW = (getWidth() * 1.0f - mHorizontalPadding * 2) / dw;
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float scaleH = (getHeight() * 1.0f - mVerticalPadding * 2) / dh;
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scale = Math.max(scaleW, scaleH);
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}
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// 宽、高均超出截图区域
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if (dw > getWidth() - mHorizontalPadding * 2 && dh > getHeight() - mVerticalPadding * 2) {
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float scaleW = (getWidth() * 1.0f - mHorizontalPadding * 2) / dw;
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float scaleH = (getHeight() * 1.0f - mVerticalPadding * 2) / dh;
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scale = Math.max(scaleW, scaleH);
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}
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initScale = scale;
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SCALE_MID = initScale * 2;
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SCALE_MAX = initScale * 4;
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mScaleMatrix.postTranslate((width - dw) / 2, (height - dh) / 2);// 平移至屏幕中心
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mScaleMatrix.postScale(scale, scale, getWidth() / 2,
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getHeight() / 2);// 设置缩放比例
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// 图片移动至屏幕中心
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setImageMatrix(mScaleMatrix);
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once = false;
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}
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}
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/**
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* 剪切图片，返回剪切后的bitmap对象
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*
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* @return
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*/
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public Bitmap clip() {
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Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(),
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Bitmap.Config.ARGB_8888);
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Canvas canvas = new Canvas(bitmap);
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draw(canvas);
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return Bitmap.createBitmap(bitmap,
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mHorizontalPadding,
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mVerticalPadding,
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mWidth,
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(getHeight() - mVerticalPadding * 2));
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}
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public void setHorizontalPadding(int mHorizontalPadding, float ratio) {
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this.mHorizontalPadding = mHorizontalPadding;
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this.mRatio = ratio;
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}
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/**
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* 自动缩放的任务
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*
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* @author zhy
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*/
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private class AutoScaleRunnable implements Runnable {
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static final float BIGGER = 1.07f;
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static final float SMALLER = 0.93f;
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private float mTargetScale;
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private float tmpScale;
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/**
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* 缩放的中心
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*/
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private float x;
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private float y;
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/**
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* 传入目标缩放值，根据目标值与当前值，判断应该放大还是缩小
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*
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* @param targetScale
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*/
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public AutoScaleRunnable(float targetScale, float x, float y) {
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this.mTargetScale = targetScale;
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this.x = x;
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this.y = y;
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if (getScale() < mTargetScale) {
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tmpScale = BIGGER;
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} else {
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tmpScale = SMALLER;
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}
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}
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@Override
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public void run() {
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// 进行缩放
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mScaleMatrix.postScale(tmpScale, tmpScale, x, y);
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checkBorder();
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setImageMatrix(mScaleMatrix);
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final float currentScale = getScale();
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// 如果值在合法范围内，继续缩放
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if (((tmpScale > 1f) && (currentScale < mTargetScale))
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|| ((tmpScale < 1f) && (mTargetScale < currentScale))) {
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CropImageZoomView.this.postDelayed(this, 16);
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} else
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// 设置为目标的缩放比例
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{
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final float deltaScale = mTargetScale / currentScale;
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mScaleMatrix.postScale(deltaScale, deltaScale, x, y);
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checkBorder();
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setImageMatrix(mScaleMatrix);
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isAutoScale = false;
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}
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}
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}
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}
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