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/* * TouchImageView.java/*from w w w.j av a2s .co m*/ * By: Michael Ortiz * Updated By: Patrick Lackemacher * Updated By: Paul Neuhold, Laurenz Theuerkauf, Alexander Ritz, Jakob Schweighofer, Milo Tischler * ------------------- * Extends Android ImageView to include pinch zooming and panning. */ package valkyrie.widget; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Matrix; import android.graphics.PointF; import android.util.AttributeSet; import android.util.Log; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.ScaleGestureDetector; import android.view.View; import android.widget.ImageView; public class TouchImageView extends ImageView { private String TAG = "TouchImageView"; Matrix matrix = new Matrix(); // We can be in one of these 3 states static final int NONE = 0; static final int DRAG = 1; static final int ZOOM = 2; int mode = NONE; float myWidth, myHeight = 0; PointF translateP = new PointF(); PointF myMid = new PointF(); PointF bmMid = new PointF(); // Remember some things for zooming PointF last = new PointF(); PointF start = new PointF(); float minScale = 1f; float maxScale = 3f; float[] m; float redundantXSpace, redundantYSpace; float width, height; static final int CLICK = 3; float saveScale = 1f; float right, bottom, origWidth, origHeight, bmWidth, bmHeight; ScaleGestureDetector mScaleDetector; GestureDetector mGestureDetector; Context context; public TouchImageView(Context context) { super(context); sharedConstructing(context); } public TouchImageView(Context context, AttributeSet attrs) { super(context, attrs); sharedConstructing(context); } private void sharedConstructing(Context context) { super.setClickable(true); this.context = context; mScaleDetector = new ScaleGestureDetector(context, new ScaleListener()); mGestureDetector = new GestureDetector(context, new GestureListener()); matrix.setTranslate(1f, 1f); m = new float[9]; setImageMatrix(matrix); setScaleType(ScaleType.MATRIX); setOnTouchListener(new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { mScaleDetector.onTouchEvent(event); mGestureDetector.onTouchEvent(event); matrix.getValues(m); float x = m[Matrix.MTRANS_X]; float y = m[Matrix.MTRANS_Y]; PointF curr = new PointF(event.getX(), event.getY()); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: last.set(event.getX(), event.getY()); start.set(last); mode = DRAG; break; case MotionEvent.ACTION_MOVE: if (mode == DRAG) { float deltaX = curr.x - last.x; float deltaY = curr.y - last.y; float scaleWidth = Math.round(origWidth * saveScale); float scaleHeight = Math.round(origHeight * saveScale); if (scaleWidth < width) { deltaX = 0; if (y + deltaY > 0) deltaY = -y; else if (y + deltaY < -bottom) deltaY = -(y + bottom); } else if (scaleHeight < height) { deltaY = 0; if (x + deltaX > 0) deltaX = -x; else if (x + deltaX < -right) deltaX = -(x + right); } else { if (x + deltaX > 0) deltaX = -x; else if (x + deltaX < -right) deltaX = -(x + right); if (y + deltaY > 0) deltaY = -y; else if (y + deltaY < -bottom) deltaY = -(y + bottom); } matrix.postTranslate(deltaX, deltaY); last.set(curr.x, curr.y); } break; case MotionEvent.ACTION_UP: mode = NONE; int xDiff = (int) Math.abs(curr.x - start.x); int yDiff = (int) Math.abs(curr.y - start.y); if (xDiff < CLICK && yDiff < CLICK) performClick(); break; case MotionEvent.ACTION_POINTER_UP: mode = NONE; break; } setImageMatrix(matrix); invalidate(); return true; // indicate event was handled } }); } @Override public void setImageBitmap(Bitmap bm) { super.setImageBitmap(bm); if (bm != null) { bmWidth = bm.getWidth(); bmHeight = bm.getHeight(); Log.d(TAG, " bmWIdth :" + bmWidth); Log.d(TAG, " bmHeight :" + bmHeight); } } public void setMaxZoom(float x) { maxScale = x; } private class GestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onDown(MotionEvent e) { return true; } // event when double tap occurs @Override public boolean onDoubleTap(MotionEvent e) { float x = e.getX(); float y = e.getY(); setScaleType(ScaleType.CENTER_INSIDE); Log.d("Double Tap", "Tapped at: (" + x + "," + y + ")"); setScaleType(ScaleType.MATRIX); return true; } } private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener { @Override public boolean onScaleBegin(ScaleGestureDetector detector) { mode = ZOOM; return true; } @Override public boolean onScale(ScaleGestureDetector detector) { float mScaleFactor = detector.getScaleFactor(); float origScale = saveScale; saveScale *= mScaleFactor; if (saveScale > maxScale) { saveScale = maxScale; mScaleFactor = maxScale / origScale; } else if (saveScale < minScale) { saveScale = minScale; mScaleFactor = minScale / origScale; setScaleType(ScaleType.CENTER_INSIDE); setScaleType(ScaleType.MATRIX); // the image } right = width * saveScale - width - (2 * redundantXSpace * saveScale); bottom = height * saveScale - height - (2 * redundantYSpace * saveScale); if (origWidth * saveScale <= width || origHeight * saveScale <= height) { setScaleType(ScaleType.MATRIX); matrix.postScale(mScaleFactor, mScaleFactor, width / 2, height / 2); if (mScaleFactor < 1) { matrix.getValues(m); float x = m[Matrix.MTRANS_X]; float y = m[Matrix.MTRANS_Y]; if (mScaleFactor < 1) { if (Math.round(origWidth * saveScale) < width) { if (y < -bottom) matrix.postTranslate(0, -(y + bottom)); else if (y > 0) matrix.postTranslate(0, -y); } else { if (x < -right) matrix.postTranslate(-(x + right), 0); else if (x > 0) matrix.postTranslate(-x, 0); } } } } else { matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY()); matrix.getValues(m); float x = m[Matrix.MTRANS_X]; float y = m[Matrix.MTRANS_Y]; if (mScaleFactor < 1) { if (x < -right) matrix.postTranslate(-(x + right), 0); else if (x > 0) matrix.postTranslate(-x, 0); if (y < -bottom) matrix.postTranslate(0, -(y + bottom)); else if (y > 0) matrix.postTranslate(0, -y); } } return true; } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); width = MeasureSpec.getSize(widthMeasureSpec); height = MeasureSpec.getSize(heightMeasureSpec); Log.d(TAG, "width: " + width); Log.d(TAG, "height: " + height); // Fit to screen. float scale; float scaleX = (float) width / (float) bmWidth; float scaleY = (float) height / (float) bmHeight; scale = Math.min(scaleX, scaleY); matrix.setScale(scale, scale); setImageMatrix(matrix); saveScale = 1f; // Center the image redundantYSpace = (float) height - (scale * (float) bmHeight); redundantXSpace = (float) width - (scale * (float) bmWidth); redundantYSpace /= (float) 2; redundantXSpace /= (float) 2; matrix.postTranslate(redundantXSpace, redundantYSpace); origWidth = width - 2 * redundantXSpace; origHeight = height - 2 * redundantYSpace; right = width * saveScale - width - (2 * redundantXSpace * saveScale); bottom = height * saveScale - height - (2 * redundantYSpace * saveScale); setImageMatrix(matrix); } }