package com.kaixin.android.ui.base;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.RectF;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.KeyEvent;
import android.widget.ImageView;
/**
* 自己重写的ImageView,用于缩放和放大移动图片使用
*
* @author gyz
*
*/
public class PhotoImageView extends ImageView {
protected Matrix mBaseMatrix = new Matrix();
protected Matrix mSuppMatrix = new Matrix();
private final Matrix mDisplayMatrix = new Matrix();
private final float[] mMatrixValues = new float[9];
protected Bitmap image = null;
private int mThisWidth = -1;
private int mThisHeight = -1;
private float mMaxZoom = 2.0f;
private float mMinZoom;
private int imageWidth;
private int imageHeight;
private float scaleRate;
private int screenWidth;
private int screenHeight;
public PhotoImageView(Context context) {
super(context);
DisplayMetrics metric = new DisplayMetrics();
((Activity) context).getWindowManager().getDefaultDisplay()
.getMetrics(metric);
screenWidth = metric.widthPixels;
screenHeight = metric.heightPixels;
init();
}
public PhotoImageView(Context context, AttributeSet attrs) {
super(context, attrs);
DisplayMetrics metric = new DisplayMetrics();
((Activity) context).getWindowManager().getDefaultDisplay()
.getMetrics(metric);
screenWidth = metric.widthPixels;
screenHeight = metric.heightPixels;
init();
}
public PhotoImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
private void arithScaleRate() {
float scaleWidth = screenWidth / (float) imageWidth;
float scaleHeight = screenHeight / (float) imageHeight;
scaleRate = Math.min(scaleWidth, scaleHeight);
}
public float getScaleRate() {
return scaleRate;
}
public int getImageWidth() {
return imageWidth;
}
public void setImageWidth(int imageWidth) {
this.imageWidth = imageWidth;
}
public int getImageHeight() {
return imageHeight;
}
public void setImageHeight(int imageHeight) {
this.imageHeight = imageHeight;
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
event.startTracking();
return true;
}
return super.onKeyDown(keyCode, event);
}
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.isTracking()
&& !event.isCanceled()) {
if (getScale() > 1.0f) {
zoomTo(1.0f);
return true;
}
}
return super.onKeyUp(keyCode, event);
}
protected Handler mHandler = new Handler();
public void setImageBitmap(Bitmap bitmap) {
super.setImageBitmap(bitmap);
image = bitmap;
arithScaleRate();
layoutToCenter();
}
protected void center(boolean horizontal, boolean vertical) {
if (image == null) {
return;
}
Matrix m = getImageViewMatrix();
RectF rect = new RectF(0, 0, image.getWidth(), image.getHeight());
m.mapRect(rect);
float height = rect.height();
float width = rect.width();
float deltaX = 0, deltaY = 0;
if (vertical) {
int viewHeight = getHeight();
if (height < viewHeight) {
deltaY = (viewHeight - height) / 2 - rect.top;
} else if (rect.top > 0) {
deltaY = -rect.top;
} else if (rect.bottom < viewHeight) {
deltaY = getHeight() - rect.bottom;
}
}
if (horizontal) {
int viewWidth = getWidth();
if (width < viewWidth) {
deltaX = (viewWidth - width) / 2 - rect.left;
} else if (rect.left > 0) {
deltaX = -rect.left;
} else if (rect.right < viewWidth) {
deltaX = viewWidth - rect.right;
}
}
postTranslate(deltaX, deltaY);
setImageMatrix(getImageViewMatrix());
}
private void init() {
setScaleType(ImageView.ScaleType.MATRIX);
}
public void layoutToCenter() {
float width = imageWidth;
float height = imageHeight;
float fill_width = screenWidth - width;
float fill_height = screenHeight - height;
float tran_width = 0f;
float tran_height = 0f;
if (fill_width > 0)
tran_width = fill_width / 2;
if (fill_height > 0)
tran_height = fill_height / 2;
postTranslate(tran_width, tran_height);
setImageMatrix(getImageViewMatrix());
}
protected float getValue(Matrix matrix, int whichValue) {
matrix.getValues(mMatrixValues);
mMinZoom = (screenWidth / 2f) / imageWidth;
return mMatrixValues[whichValue];
}
protected float getScale(Matrix matrix) {
return getValue(matrix, Matrix.MSCALE_X);
}
protected float getScale() {
return getScale(mSuppMatrix);
}
protected Matrix getImageViewMatrix() {
mDisplayMatrix.set(mBaseMatrix);
mDisplayMatrix.postConcat(mSuppMatrix);
return mDisplayMatrix;
}
static final float SCALE_RATE = 1.25F;
protected float maxZoom() {
if (image == null) {
return 1F;
}
float fw = (float) image.getWidth() / (float) mThisWidth;
float fh = (float) image.getHeight() / (float) mThisHeight;
float max = Math.max(fw, fh) * 4;
return max;
}
protected void zoomTo(float scale, float centerX, float centerY) {
if (scale > mMaxZoom) {
scale = mMaxZoom;
} else if (scale < mMinZoom) {
scale = mMinZoom;
}
float oldScale = getScale();
float deltaScale = scale / oldScale;
mSuppMatrix.postScale(deltaScale, deltaScale, centerX, centerY);
setImageMatrix(getImageViewMatrix());
center(true, true);
}
protected void zoomTo(final float scale, final float centerX,
final float centerY, final float durationMs) {
final float incrementPerMs = (scale - getScale()) / durationMs;
final float oldScale = getScale();
final long startTime = System.currentTimeMillis();
mHandler.post(new Runnable() {
public void run() {
long now = System.currentTimeMillis();
float currentMs = Math.min(durationMs, now - startTime);
float target = oldScale + (incrementPerMs * currentMs);
zoomTo(target, centerX, centerY);
if (currentMs < durationMs) {
mHandler.post(this);
}
}
});
}
protected void zoomTo(float scale) {
float cx = getWidth() / 2F;
float cy = getHeight() / 2F;
zoomTo(scale, cx, cy);
}
protected void zoomToPoint(float scale, float pointX, float pointY) {
float cx = getWidth() / 2F;
float cy = getHeight() / 2F;
panBy(cx - pointX, cy - pointY);
zoomTo(scale, cx, cy);
}
protected void zoomIn() {
zoomIn(SCALE_RATE);
}
protected void zoomOut() {
zoomOut(SCALE_RATE);
}
protected void zoomIn(float rate) {
if (getScale() >= mMaxZoom) {
return;
} else if (getScale() <= mMinZoom) {
return;
}
if (image == null) {
return;
}
float cx = getWidth() / 2F;
float cy = getHeight() / 2F;
mSuppMatrix.postScale(rate, rate, cx, cy);
setImageMatrix(getImageViewMatrix());
}
protected void zoomOut(float rate) {
if (image == null) {
return;
}
float cx = getWidth() / 2F;
float cy = getHeight() / 2F;
Matrix tmp = new Matrix(mSuppMatrix);
tmp.postScale(1F / rate, 1F / rate, cx, cy);
if (getScale(tmp) < 1F) {
mSuppMatrix.setScale(1F, 1F, cx, cy);
} else {
mSuppMatrix.postScale(1F / rate, 1F / rate, cx, cy);
}
setImageMatrix(getImageViewMatrix());
center(true, true);
}
public void postTranslate(float dx, float dy) {
mSuppMatrix.postTranslate(dx, dy);
setImageMatrix(getImageViewMatrix());
}
float _dy = 0.0f;
protected void postTranslateDur(final float dy, final float durationMs) {
_dy = 0.0f;
final float incrementPerMs = dy / durationMs;
final long startTime = System.currentTimeMillis();
mHandler.post(new Runnable() {
public void run() {
long now = System.currentTimeMillis();
float currentMs = Math.min(durationMs, now - startTime);
postTranslate(0, incrementPerMs * currentMs - _dy);
_dy = incrementPerMs * currentMs;
if (currentMs < durationMs) {
mHandler.post(this);
}
}
});
}
protected void panBy(float dx, float dy) {
postTranslate(dx, dy);
setImageMatrix(getImageViewMatrix());
}
}