AttributeSet이 뭔지 궁금합니다. 대체 머하는놈이고 왜 이녀석을 파라미터로 쓰는지 궁금합니다;;
그리고 제가 이미지 확대축소하는 클래스를 얻었는데 파라미터로 AttributeSet를 사용하더군요.. 근데 이걸 어떻게 넘겨야할지 이해가안가서 질문드립니다. 클래스는 아래와 같습니다.
package net.fx.android;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.ImageView.ScaleType;
public class ImgViewTouch extends ImageView {
private static final String TAG = "ImgViewChild";
private static final boolean D = false;
private Matrix matrix;
private Matrix savedMatrix;
private Matrix savedMatrix2;
private Drawable d;
private static final int NONE = 0;
private static final int DRAG = 1;
private static final int ZOOM = 2;
private int mode = NONE;
private PointF start = new PointF();
private PointF mid = new PointF();
private float oldDist = 1f;
private static final int WIDTH = 0;
private static final int HEIGHT = 1;
private boolean isInit = false;
/** Constants describing the state of this imageview */
private boolean isMoving;
private boolean isScaling;
private boolean isRestoring;
public ImgViewTouch(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setScaleType(ScaleType.MATRIX);
matrix = new Matrix();
savedMatrix = new Matrix();
savedMatrix2 = new Matrix();
}
public ImgViewTouch(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ImgViewTouch(Context context) {
this(context, null);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
if (D) Log.i(TAG, "onLayout");
d = this.getDrawable();
super.onLayout(changed, left, top, right, bottom);
if (isInit == false){
init();
isInit = true;
}
}
@Override
public void setImageBitmap(Bitmap bm) {
if (D) Log.i(TAG, "setImageBitmap");
super.setImageBitmap(bm);
isInit = false;
init();
}
@Override
public void setImageResource(int resId) {
if (D) Log.i(TAG, "setImageResource");
super.setImageResource(resId);
d = getDrawable();
isInit = false;
init();
}
protected void init() {
d = this.getDrawable();
initImgPos();
setImageMatrix(matrix);
}
/**
* Sets the image in the imageview using the matrix
*/
public void initImgPos(){
float[] value = new float[9];
this.matrix.getValues(value);
int width = this.getWidth();
int height = this.getHeight();
if (d == null) return;
int imageWidth = d.getIntrinsicWidth();
int imageHeight = d.getIntrinsicHeight();
int scaleWidth = (int) (imageWidth * value[0]);
int scaleHeight = (int) (imageHeight * value[4]);
if (imageWidth > width || imageHeight > height){
float xratio = (float)width / (float)imageWidth;
float yratio = (float)height / (float)imageHeight;
// Math.min fits the image to the shorter axis. (with letterboxes around)
// Math.max fits the image th the longer axis. (with the other axis cropped)
value[0] = value[4] = Math.max(xratio, yratio);
}
scaleWidth = (int) (imageWidth * value[0]);
scaleHeight = (int) (imageHeight * value[4]);
// align the image to the top left corner
value[2] = 0;
value[5] = 0;
// center the image. it will be aligned to the top left corner otherwise.
value[2] = (float) width / 2 - (float)scaleWidth / 2;
value[5] = (float) height / 2 - (float)scaleHeight / 2;
matrix.setValues(value);
setImageMatrix(matrix);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if(D) dumpEvent(event);
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
restore(matrix);
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x, event.getY() - start.y);
}
else if (mode == ZOOM) {
float newDist = spacing(event);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
// Matrix value modification
// comment out below 2 lines to remove all restrictions on image transformation.
matrixTuning(matrix);
setImageMatrix(savedMatrix2);
return true;
}
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
private void matrixTuning(Matrix matrix){
float[] value = new float[9];
matrix.getValues(value);
float[] savedValue = new float[9];
savedMatrix2.getValues(savedValue);
int width = getWidth();
int height = getHeight();
Drawable d = getDrawable();
if (d == null) return;
int imageWidth = d.getIntrinsicWidth();
int imageHeight = d.getIntrinsicHeight();
int scaleWidth = (int) (imageWidth * value[0]);
int scaleHeight = (int) (imageHeight * value[4]);
// don't let the image go outside
if (value[2] < width - scaleWidth) value[2] = width - scaleWidth;
if (value[5] < height - scaleHeight) value[5] = height - scaleHeight;
if (value[2] > 0) value[2] = 0;
if (value[5] > 0) value[5] = 0;
// maximum zoom ratio: 2x
if (value[0] > 2 || value[4] > 2){
value[0] = savedValue[0];
value[4] = savedValue[4];
value[2] = savedValue[2];
value[5] = savedValue[5];
}
// don't let the image become smaller than the screen
if (imageWidth > width || imageHeight > height){
if (scaleWidth < width && scaleHeight < height){
int target = WIDTH;
if (imageWidth < imageHeight) target = HEIGHT;
if (target == WIDTH) value[0] = value[4] = (float)width / imageWidth;
if (target == HEIGHT) value[0] = value[4] = (float)height / imageHeight;
scaleWidth = (int) (imageWidth * value[0]);
scaleHeight = (int) (imageHeight * value[4]);
if (scaleWidth > width) value[0] = value[4] = (float)width / imageWidth;
if (scaleHeight > height) value[0] = value[4] = (float)height / imageHeight;
}
}
// don't allow scale down under its size
else{
if (value[0] < 1) value[0] = 1;
if (value[4] < 1) value[4] = 1;
}
// center the image
scaleWidth = (int) (imageWidth * value[0]);
scaleHeight = (int) (imageHeight * value[4]);
if (scaleWidth < width){
value[2] = (float) width / 2 - (float)scaleWidth / 2;
}
if (scaleHeight < height){
value[5] = (float) height / 2 - (float)scaleHeight / 2;
}
matrix.setValues(value);
savedMatrix2.set(matrix);
}
/** Gives animation effect after touchscreen event,
* puts the image back into the screen,
* limits max zoom at specific ratio. */
private void restore(Matrix m) {
setImageMatrix(matrix);
}
/** Show an event in the LogCat view, for debugging */
private void dumpEvent(MotionEvent event) {
String names[] = { "DOWN" , "UP" , "MOVE" , "CANCEL" , "OUTSIDE" ,
"POINTER_DOWN" , "POINTER_UP" , "7?" , "8?" , "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append("event ACTION_" ).append(names[actionCode]);
if (actionCode == MotionEvent.ACTION_POINTER_DOWN
|| actionCode == MotionEvent.ACTION_POINTER_UP) {
sb.append("(pid " ).append(
action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")" );
}
sb.append("[" );
for (int i = 0; i < event.getPointerCount(); i++) {
sb.append("#" ).append(i);
sb.append("(pid " ).append(event.getPointerId(i));
sb.append(")=" ).append((int) event.getX(i));
sb.append("," ).append((int) event.getY(i));
if (i + 1 < event.getPointerCount())
sb.append(";" );
}
sb.append("]" );
Log.d(TAG, sb.toString());
}
}