package it.sephiroth.android.library.imagezoom;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.ImageView;
import it.sephiroth.android.library.easing.Cubic;
import it.sephiroth.android.library.easing.Easing;
import it.sephiroth.android.library.imagezoom.graphics.FastBitmapDrawable;
import it.sephiroth.android.library.imagezoom.utils.IDisposable;
/**
* Base View to manage image zoom/scrool/pinch operations
*
* @author alessandro
*/
public abstract class ImageViewTouchBase extends ImageView implements IDisposable
{
public static final String VERSION = "1.0.3";
public interface OnDrawableChangeListener
{
/**
* Callback invoked when a new drawable has been assigned to the view
*
* @param drawable
*/
void onDrawableChanged(Drawable drawable);
}
public interface OnLayoutChangeListener
{
/**
* Callback invoked when the layout bounds changed
*
* @param changed
* @param left
* @param top
* @param right
* @param bottom
*/
void onLayoutChanged(boolean changed, int left, int top, int right, int bottom);
}
/**
* Use this to change the
* {@link it.sephiroth.android.library.imagezoom.ImageViewTouchBase#setDisplayType(it.sephiroth.android.library.imagezoom.ImageViewTouchBase.DisplayType)}
* of this View
*
* @author alessandro
*/
public enum DisplayType
{
/** Image is not scaled by default */
NONE,
/** Image will be always presented using this view's bounds */
FIT_TO_SCREEN,
/** Image will be scaled only if bigger than the bounds of this view */
FIT_IF_BIGGER
}
public static final String LOG_TAG = "ImageViewTouchBase";
protected static final boolean LOG_ENABLED = false;
public static final float ZOOM_INVALID = -1f;
protected Easing mEasing = new Cubic();
protected Matrix mBaseMatrix = new Matrix();
protected Matrix mSuppMatrix = new Matrix();
protected Matrix mNextMatrix;
protected Handler mHandler = new Handler();
protected Runnable mLayoutRunnable = null;
protected boolean mUserScaled = false;
private float mMaxZoom = ZOOM_INVALID;
private float mMinZoom = ZOOM_INVALID;
// true when min and max zoom are explicitly defined
private boolean mMaxZoomDefined;
private boolean mMinZoomDefined;
protected final Matrix mDisplayMatrix = new Matrix();
protected final float[] mMatrixValues = new float[9];
private int mThisWidth = -1;
private int mThisHeight = -1;
private PointF mCenter = new PointF();
protected DisplayType mScaleType = DisplayType.NONE;
private boolean mScaleTypeChanged;
private boolean mBitmapChanged;
final protected int DEFAULT_ANIMATION_DURATION = 200;
protected RectF mBitmapRect = new RectF();
protected RectF mCenterRect = new RectF();
protected RectF mScrollRect = new RectF();
private OnDrawableChangeListener mDrawableChangeListener;
private OnLayoutChangeListener mOnLayoutChangeListener;
public ImageViewTouchBase(Context context)
{
this(context, null);
}
public ImageViewTouchBase(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public ImageViewTouchBase(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
init(context, attrs, defStyle);
}
public void setOnDrawableChangedListener(OnDrawableChangeListener listener)
{
mDrawableChangeListener = listener;
}
public void setOnLayoutChangeListener(OnLayoutChangeListener listener)
{
mOnLayoutChangeListener = listener;
}
protected void init(Context context, AttributeSet attrs, int defStyle)
{
setScaleType(ScaleType.MATRIX);
}
@Override
public void setScaleType(ScaleType scaleType)
{
if (scaleType == ScaleType.MATRIX)
{
super.setScaleType(scaleType);
}
else
{
Log.w(LOG_TAG, "Unsupported scaletype. Only MATRIX can be used");
}
}
/**
* Clear the current drawable
*/
public void clear()
{
setImageBitmap(null);
}
/**
* Change the display type
*/
public void setDisplayType(DisplayType type)
{
if (type != mScaleType)
{
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "setDisplayType: " + type);
}
mUserScaled = false;
mScaleType = type;
mScaleTypeChanged = true;
requestLayout();
}
}
public DisplayType getDisplayType()
{
return mScaleType;
}
protected void setMinScale(float value)
{
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "setMinZoom: " + value);
}
mMinZoom = value;
}
protected void setMaxScale(float value)
{
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "setMaxZoom: " + value);
}
mMaxZoom = value;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom)
{
if (LOG_ENABLED)
{
Log.e(LOG_TAG, "onLayout: " + changed + ", bitmapChanged: " + mBitmapChanged + ", scaleChanged: "
+ mScaleTypeChanged);
}
super.onLayout(changed, left, top, right, bottom);
int deltaX = 0;
int deltaY = 0;
if (changed)
{
int oldw = mThisWidth;
int oldh = mThisHeight;
mThisWidth = right - left;
mThisHeight = bottom - top;
deltaX = mThisWidth - oldw;
deltaY = mThisHeight - oldh;
// update center point
mCenter.x = mThisWidth / 2f;
mCenter.y = mThisHeight / 2f;
}
Runnable r = mLayoutRunnable;
if (r != null)
{
mLayoutRunnable = null;
r.run();
}
final Drawable drawable = getDrawable();
if (drawable != null)
{
if (changed || mScaleTypeChanged || mBitmapChanged)
{
float scale = 1;
// retrieve the old values
float old_default_scale = getDefaultScale(mScaleType);
float old_matrix_scale = getScale(mBaseMatrix);
float old_scale = getScale();
float old_min_scale = Math.min(1f, 1f / old_matrix_scale);
getProperBaseMatrix(drawable, mBaseMatrix);
float new_matrix_scale = getScale(mBaseMatrix);
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "old matrix scale: " + old_matrix_scale);
Log.d(LOG_TAG, "new matrix scale: " + new_matrix_scale);
Log.d(LOG_TAG, "old min scale: " + old_min_scale);
Log.d(LOG_TAG, "old scale: " + old_scale);
}
// 1. bitmap changed or scaletype changed
if (mBitmapChanged || mScaleTypeChanged)
{
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "display type: " + mScaleType);
Log.d(LOG_TAG, "newMatrix: " + mNextMatrix);
}
if (mNextMatrix != null)
{
mSuppMatrix.set(mNextMatrix);
mNextMatrix = null;
scale = getScale();
}
else
{
mSuppMatrix.reset();
scale = getDefaultScale(mScaleType);
}
setImageMatrix(getImageViewMatrix());
if (scale != getScale())
{
zoomTo(scale);
}
}
else if (changed)
{
// 2. layout size changed
if (!mMinZoomDefined) mMinZoom = ZOOM_INVALID;
if (!mMaxZoomDefined) mMaxZoom = ZOOM_INVALID;
setImageMatrix(getImageViewMatrix());
postTranslate(-deltaX, -deltaY);
if (!mUserScaled)
{
scale = getDefaultScale(mScaleType);
zoomTo(scale);
}
else
{
if (Math.abs(old_scale - old_min_scale) > 0.001)
{
scale = (old_matrix_scale / new_matrix_scale) * old_scale;
}
zoomTo(scale);
}
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "old min scale: " + old_default_scale);
Log.d(LOG_TAG, "old scale: " + old_scale);
Log.d(LOG_TAG, "new scale: " + scale);
}
}
mUserScaled = false;
if (scale > getMaxScale() || scale < getMinScale())
{
// if current scale if outside the min/max bounds
// then restore the correct scale
zoomTo(scale);
}
center(true, true);
if (mBitmapChanged) onDrawableChanged(drawable);
if (changed || mBitmapChanged || mScaleTypeChanged) onLayoutChanged(left, top, right, bottom);
if (mScaleTypeChanged) mScaleTypeChanged = false;
if (mBitmapChanged) mBitmapChanged = false;
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "new scale: " + getScale());
}
}
}
else
{
// drawable is null
if (mBitmapChanged) onDrawableChanged(drawable);
if (changed || mBitmapChanged || mScaleTypeChanged) onLayoutChanged(left, top, right, bottom);
if (mBitmapChanged) mBitmapChanged = false;
if (mScaleTypeChanged) mScaleTypeChanged = false;
}
}
/**
* Restore the original display
*/
public void resetDisplay()
{
mBitmapChanged = true;
requestLayout();
}
public void resetMatrix()
{
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "resetMatrix");
}
mSuppMatrix = new Matrix();
float scale = getDefaultScale(mScaleType);
setImageMatrix(getImageViewMatrix());
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "default scale: " + scale + ", scale: " + getScale());
}
if (scale != getScale())
{
zoomTo(scale);
}
postInvalidate();
}
protected float getDefaultScale(DisplayType type)
{
if (type == DisplayType.FIT_TO_SCREEN)
{
// always fit to screen
return 1f;
}
else if (type == DisplayType.FIT_IF_BIGGER)
{
// normal scale if smaller, fit to screen otherwise
return Math.min(1f, 1f / getScale(mBaseMatrix));
}
else
{
// no scale
return 1f / getScale(mBaseMatrix);
}
}
@Override
public void setImageResource(int resId)
{
setImageDrawable(getContext().getResources().getDrawable(resId));
}
/**
* {@inheritDoc} Set the new image to display and reset the internal matrix.
*
* @param bitmap the {@link android.graphics.Bitmap} to display
* @see {@link android.widget.ImageView#setImageBitmap(android.graphics.Bitmap)}
*/
@Override
public void setImageBitmap(final Bitmap bitmap)
{
setImageBitmap(bitmap, null, ZOOM_INVALID, ZOOM_INVALID);
}
/**
* @see #setImageDrawable(android.graphics.drawable.Drawable,
* android.graphics.Matrix, float, float)
* @param bitmap
* @param matrix
* @param min_zoom
* @param max_zoom
*/
public void setImageBitmap(final Bitmap bitmap, Matrix matrix, float min_zoom, float max_zoom)
{
if (bitmap != null)
setImageDrawable(new FastBitmapDrawable(bitmap), matrix, min_zoom, max_zoom);
else
setImageDrawable(null, matrix, min_zoom, max_zoom);
}
@Override
public void setImageDrawable(Drawable drawable)
{
setImageDrawable(drawable, null, ZOOM_INVALID, ZOOM_INVALID);
}
/**
* Note: if the scaleType is FitToScreen then min_zoom must be <= 1 and
* max_zoom must be >= 1
*
* @param drawable the new drawable
* @param initial_matrix the optional initial display matrix
* @param min_zoom the optional minimum scale, pass {@link #ZOOM_INVALID} to
* use the default min_zoom
* @param max_zoom the optional maximum scale, pass {@link #ZOOM_INVALID} to
* use the default max_zoom
*/
public void setImageDrawable(final Drawable drawable, final Matrix initial_matrix, final float min_zoom,
final float max_zoom)
{
final int viewWidth = getWidth();
if (viewWidth <= 0)
{
mLayoutRunnable = new Runnable()
{
@Override
public void run()
{
setImageDrawable(drawable, initial_matrix, min_zoom, max_zoom);
}
};
return;
}
_setImageDrawable(drawable, initial_matrix, min_zoom, max_zoom);
}
protected void _setImageDrawable(final Drawable drawable, final Matrix initial_matrix, float min_zoom,
float max_zoom)
{
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "_setImageDrawable");
}
if (drawable != null)
{
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "size: " + drawable.getIntrinsicWidth() + "x" + drawable.getIntrinsicHeight());
}
super.setImageDrawable(drawable);
}
else
{
mBaseMatrix.reset();
super.setImageDrawable(null);
}
if (min_zoom != ZOOM_INVALID && max_zoom != ZOOM_INVALID)
{
min_zoom = Math.min(min_zoom, max_zoom);
max_zoom = Math.max(min_zoom, max_zoom);
mMinZoom = min_zoom;
mMaxZoom = max_zoom;
mMinZoomDefined = true;
mMaxZoomDefined = true;
if (mScaleType == DisplayType.FIT_TO_SCREEN || mScaleType == DisplayType.FIT_IF_BIGGER)
{
if (mMinZoom >= 1)
{
mMinZoomDefined = false;
mMinZoom = ZOOM_INVALID;
}
if (mMaxZoom <= 1)
{
mMaxZoomDefined = true;
mMaxZoom = ZOOM_INVALID;
}
}
}
else
{
mMinZoom = ZOOM_INVALID;
mMaxZoom = ZOOM_INVALID;
mMinZoomDefined = false;
mMaxZoomDefined = false;
}
if (initial_matrix != null)
{
mNextMatrix = new Matrix(initial_matrix);
}
mBitmapChanged = true;
requestLayout();
}
/**
* Fired as soon as a new Bitmap has been set
*
* @param drawable
*/
protected void onDrawableChanged(final Drawable drawable)
{
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "onDrawableChanged");
}
fireOnDrawableChangeListener(drawable);
}
protected void fireOnLayoutChangeListener(int left, int top, int right, int bottom)
{
if (null != mOnLayoutChangeListener)
{
mOnLayoutChangeListener.onLayoutChanged(true, left, top, right, bottom);
}
}
protected void fireOnDrawableChangeListener(Drawable drawable)
{
if (null != mDrawableChangeListener)
{
mDrawableChangeListener.onDrawableChanged(drawable);
}
}
/**
* Called just after {@link #onLayout(boolean, int, int, int, int)} if the
* view's bounds has changed or a new Drawable has been set or the
* {@link it.sephiroth.android.library.imagezoom.ImageViewTouchBase.DisplayType}
* has been modified
*
* @param left
* @param top
* @param right
* @param bottom
*/
protected void onLayoutChanged(int left, int top, int right, int bottom)
{
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "onLayoutChanged");
}
fireOnLayoutChangeListener(left, top, right, bottom);
}
protected float computeMaxZoom()
{
final Drawable drawable = getDrawable();
if (drawable == null) { return 1F; }
float fw = (float) drawable.getIntrinsicWidth() / (float) mThisWidth;
float fh = (float) drawable.getIntrinsicHeight() / (float) mThisHeight;
float scale = Math.max(fw, fh) * 8;
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "computeMaxZoom: " + scale);
}
return scale;
}
protected float computeMinZoom()
{
final Drawable drawable = getDrawable();
if (drawable == null) { return 1F; }
float scale = getScale(mBaseMatrix);
scale = Math.min(1f, 1f / scale);
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "computeMinZoom: " + scale);
}
return scale;
}
/**
* Returns the current maximum allowed image scale
*
* @return
*/
public float getMaxScale()
{
if (mMaxZoom == ZOOM_INVALID)
{
mMaxZoom = computeMaxZoom();
}
return mMaxZoom;
}
/**
* Returns the current minimum allowed image scale
*
* @return
*/
public float getMinScale()
{
if (mMinZoom == ZOOM_INVALID)
{
mMinZoom = computeMinZoom();
}
return mMinZoom;
}
/**
* Returns the current view matrix
*
* @return
*/
public Matrix getImageViewMatrix()
{
return getImageViewMatrix(mSuppMatrix);
}
public Matrix getImageViewMatrix(Matrix supportMatrix)
{
mDisplayMatrix.set(mBaseMatrix);
mDisplayMatrix.postConcat(supportMatrix);
return mDisplayMatrix;
}
@Override
public void setImageMatrix(Matrix matrix)
{
Matrix current = getImageMatrix();
boolean needUpdate = false;
if (matrix == null && !current.isIdentity() || matrix != null && !current.equals(matrix))
{
needUpdate = true;
}
super.setImageMatrix(matrix);
if (needUpdate) onImageMatrixChanged();
}
/**
* Called just after a new Matrix has been assigned.
*
* @see {@link #setImageMatrix(android.graphics.Matrix)}
*/
protected void onImageMatrixChanged()
{
}
/**
* Returns the current image display matrix.<br />
* This matrix can be used in the next call to the
* {@link #setImageDrawable(android.graphics.drawable.Drawable, android.graphics.Matrix, float, float)}
* to restore the same view state of the previous
* {@link android.graphics.Bitmap}.<br />
* Example:
*
* <pre>
* Matrix currentMatrix = mImageView.getDisplayMatrix();
* mImageView.setImageBitmap(newBitmap, currentMatrix, ZOOM_INVALID, ZOOM_INVALID);
* </pre>
*
* @return the current support matrix
*/
public Matrix getDisplayMatrix()
{
return new Matrix(mSuppMatrix);
}
/**
* Setup the base matrix so that the image is centered and scaled properly.
*
* @param drawable
* @param matrix
*/
protected void getProperBaseMatrix(Drawable drawable, Matrix matrix)
{
float viewWidth = mThisWidth;
float viewHeight = mThisHeight;
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "getProperBaseMatrix. view: " + viewWidth + "x" + viewHeight);
}
float w = drawable.getIntrinsicWidth();
float h = drawable.getIntrinsicHeight();
float widthScale, heightScale;
matrix.reset();
if (w > viewWidth || h > viewHeight)
{
widthScale = viewWidth / w;
heightScale = viewHeight / h;
float scale = Math.min(widthScale, heightScale);
matrix.postScale(scale, scale);
float tw = (viewWidth - w * scale) / 2.0f;
float th = (viewHeight - h * scale) / 2.0f;
matrix.postTranslate(tw, th);
}
else
{
widthScale = viewWidth / w;
heightScale = viewHeight / h;
float scale = Math.min(widthScale, heightScale);
matrix.postScale(scale, scale);
float tw = (viewWidth - w * scale) / 2.0f;
float th = (viewHeight - h * scale) / 2.0f;
matrix.postTranslate(tw, th);
}
if (LOG_ENABLED)
{
printMatrix(matrix);
}
}
/**
* Setup the base matrix so that the image is centered and scaled properly.
*
* @param bitmap
* @param matrix
*/
protected void getProperBaseMatrix2(Drawable bitmap, Matrix matrix)
{
float viewWidth = mThisWidth;
float viewHeight = mThisHeight;
float w = bitmap.getIntrinsicWidth();
float h = bitmap.getIntrinsicHeight();
matrix.reset();
float widthScale = viewWidth / w;
float heightScale = viewHeight / h;
float scale = Math.min(widthScale, heightScale);
matrix.postScale(scale, scale);
matrix.postTranslate((viewWidth - w * scale) / 2.0f, (viewHeight - h * scale) / 2.0f);
}
protected float getValue(Matrix matrix, int whichValue)
{
matrix.getValues(mMatrixValues);
return mMatrixValues[whichValue];
}
public void printMatrix(Matrix matrix)
{
float scalex = getValue(matrix, Matrix.MSCALE_X);
float scaley = getValue(matrix, Matrix.MSCALE_Y);
float tx = getValue(matrix, Matrix.MTRANS_X);
float ty = getValue(matrix, Matrix.MTRANS_Y);
Log.d(LOG_TAG, "matrix: { x: " + tx + ", y: " + ty + ", scalex: " + scalex + ", scaley: " + scaley + " }");
}
public RectF getBitmapRect()
{
return getBitmapRect(mSuppMatrix);
}
protected RectF getBitmapRect(Matrix supportMatrix)
{
final Drawable drawable = getDrawable();
if (drawable == null) return null;
Matrix m = getImageViewMatrix(supportMatrix);
mBitmapRect.set(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
m.mapRect(mBitmapRect);
return mBitmapRect;
}
protected float getScale(Matrix matrix)
{
return getValue(matrix, Matrix.MSCALE_X);
}
@SuppressLint("Override")
public float getRotation()
{
return 0;
}
/**
* Returns the current image scale
*
* @return
*/
public float getScale()
{
return getScale(mSuppMatrix);
}
public float getBaseScale()
{
return getScale(mBaseMatrix);
}
protected void center(boolean horizontal, boolean vertical)
{
final Drawable drawable = getDrawable();
if (drawable == null) return;
RectF rect = getCenter(mSuppMatrix, horizontal, vertical);
if (rect.left != 0 || rect.top != 0)
{
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "center");
}
postTranslate(rect.left, rect.top);
}
}
protected RectF getCenter(Matrix supportMatrix, boolean horizontal, boolean vertical)
{
final Drawable drawable = getDrawable();
if (drawable == null) return new RectF(0, 0, 0, 0);
mCenterRect.set(0, 0, 0, 0);
RectF rect = getBitmapRect(supportMatrix);
float height = rect.height();
float width = rect.width();
float deltaX = 0, deltaY = 0;
if (vertical)
{
int viewHeight = mThisHeight;
if (height < viewHeight)
{
deltaY = (viewHeight - height) / 2 - rect.top;
}
else if (rect.top > 0)
{
deltaY = -rect.top;
}
else if (rect.bottom < viewHeight)
{
deltaY = mThisHeight - rect.bottom;
}
}
if (horizontal)
{
int viewWidth = mThisWidth;
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;
}
}
mCenterRect.set(deltaX, deltaY, 0, 0);
return mCenterRect;
}
protected void postTranslate(float deltaX, float deltaY)
{
if (deltaX != 0 || deltaY != 0)
{
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "postTranslate: " + deltaX + "x" + deltaY);
}
mSuppMatrix.postTranslate(deltaX, deltaY);
setImageMatrix(getImageViewMatrix());
}
}
protected void postScale(float scale, float centerX, float centerY)
{
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "postScale: " + scale + ", center: " + centerX + "x" + centerY);
}
mSuppMatrix.postScale(scale, scale, centerX, centerY);
setImageMatrix(getImageViewMatrix());
}
protected PointF getCenter()
{
return mCenter;
}
protected void zoomTo(float scale)
{
if (LOG_ENABLED)
{
Log.i(LOG_TAG, "zoomTo: " + scale);
}
if (scale > getMaxScale()) scale = getMaxScale();
if (scale < getMinScale()) scale = getMinScale();
if (LOG_ENABLED)
{
Log.d(LOG_TAG, "sanitized scale: " + scale);
}
PointF center = getCenter();
zoomTo(scale, center.x, center.y);
}
/**
* Scale to the target scale
*
* @param scale the target zoom
* @param durationMs the animation duration
*/
public void zoomTo(float scale, float durationMs)
{
PointF center = getCenter();
zoomTo(scale, center.x, center.y, durationMs);
}
protected void zoomTo(float scale, float centerX, float centerY)
{
if (scale > getMaxScale()) scale = getMaxScale();
float oldScale = getScale();
float deltaScale = scale / oldScale;
postScale(deltaScale, centerX, centerY);
onZoom(getScale());
center(true, true);
}
protected void onZoom(float scale)
{
}
protected void onZoomAnimationCompleted(float scale)
{
}
/**
* Scrolls the view by the x and y amount
*
* @param x
* @param y
*/
public void scrollBy(float x, float y)
{
panBy(x, y);
}
protected void panBy(double dx, double dy)
{
RectF rect = getBitmapRect();
mScrollRect.set((float) dx, (float) dy, 0, 0);
updateRect(rect, mScrollRect);
postTranslate(mScrollRect.left, mScrollRect.top);
center(true, true);
}
protected void updateRect(RectF bitmapRect, RectF scrollRect)
{
if (bitmapRect == null) return;
if (bitmapRect.top >= 0 && bitmapRect.bottom <= mThisHeight) scrollRect.top = 0;
if (bitmapRect.left >= 0 && bitmapRect.right <= mThisWidth) scrollRect.left = 0;
if (bitmapRect.top + scrollRect.top >= 0 && bitmapRect.bottom > mThisHeight)
scrollRect.top = (int) (0 - bitmapRect.top);
if (bitmapRect.bottom + scrollRect.top <= (mThisHeight) && bitmapRect.top < 0)
scrollRect.top = (int) ((mThisHeight) - bitmapRect.bottom);
if (bitmapRect.left + scrollRect.left >= 0) scrollRect.left = (int) (0 - bitmapRect.left);
if (bitmapRect.right + scrollRect.left <= (mThisWidth))
scrollRect.left = (int) ((mThisWidth) - bitmapRect.right);
}
protected void scrollBy(float distanceX, float distanceY, final double durationMs)
{
final double dx = distanceX;
final double dy = distanceY;
final long startTime = System.currentTimeMillis();
mHandler.post(new Runnable()
{
double old_x = 0;
double old_y = 0;
@Override
public void run()
{
long now = System.currentTimeMillis();
double currentMs = Math.min(durationMs, now - startTime);
double x = mEasing.easeOut(currentMs, 0, dx, durationMs);
double y = mEasing.easeOut(currentMs, 0, dy, durationMs);
panBy((x - old_x), (y - old_y));
old_x = x;
old_y = y;
if (currentMs < durationMs)
{
mHandler.post(this);
}
else
{
RectF centerRect = getCenter(mSuppMatrix, true, true);
if (centerRect.left != 0 || centerRect.top != 0) scrollBy(centerRect.left, centerRect.top);
}
}
});
}
protected void zoomTo(float scale, float centerX, float centerY, final float durationMs)
{
if (scale > getMaxScale()) scale = getMaxScale();
final long startTime = System.currentTimeMillis();
final float oldScale = getScale();
final float deltaScale = scale - oldScale;
Matrix m = new Matrix(mSuppMatrix);
m.postScale(scale, scale, centerX, centerY);
RectF rect = getCenter(m, true, true);
final float destX = centerX + rect.left * scale;
final float destY = centerY + rect.top * scale;
mHandler.post(new Runnable()
{
@Override
public void run()
{
long now = System.currentTimeMillis();
float currentMs = Math.min(durationMs, now - startTime);
float newScale = (float) mEasing.easeInOut(currentMs, 0, deltaScale, durationMs);
zoomTo(oldScale + newScale, destX, destY);
if (currentMs < durationMs)
{
mHandler.post(this);
}
else
{
onZoomAnimationCompleted(getScale());
center(true, true);
}
}
});
}
@Override
public void dispose()
{
clear();
}
}