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Add support for scale changed listener #49

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Add support for scale changed listener #49

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31 changes: 30 additions & 1 deletion imageviewzoom/src/it/sephiroth/android/library/imagezoom/ImageViewTouchBase.java
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,14 @@ public interface OnLayoutChangeListener {
*/
void onLayoutChanged( boolean changed, int left, int top, int right, int bottom );
};

public interface OnScaleChangeListener {
/**
* Callback invoked when the user scale status has changed
* @param isScaled
*/
void onScaleChanged(boolean isScaled);
}

/**
* Use this to change the {@link ImageViewTouchBase#setDisplayType(DisplayType)} of
Expand Down Expand Up @@ -90,6 +98,7 @@ public enum DisplayType {
private int mThisWidth = -1;
private int mThisHeight = -1;
private PointF mCenter = new PointF();
private float mOldScale;

protected DisplayType mScaleType = DisplayType.NONE;
private boolean mScaleTypeChanged;
Expand All @@ -103,6 +112,7 @@ public enum DisplayType {

private OnDrawableChangeListener mDrawableChangeListener;
private OnLayoutChangeListener mOnLayoutChangeListener;
private OnScaleChangeListener mOnScaleChangeListener;

public ImageViewTouchBase( Context context ) {
this( context, null );
Expand All @@ -124,6 +134,10 @@ public void setOnDrawableChangedListener( OnDrawableChangeListener listener ) {
public void setOnLayoutChangeListener( OnLayoutChangeListener listener ) {
mOnLayoutChangeListener = listener;
}

public void setOnScaleChangeListener( OnScaleChangeListener listener ) {
mOnScaleChangeListener = listener;
}

protected void init( Context context, AttributeSet attrs, int defStyle ) {
setScaleType( ImageView.ScaleType.MATRIX );
Expand Down Expand Up @@ -509,6 +523,12 @@ protected void fireOnDrawableChangeListener( Drawable drawable ) {
mDrawableChangeListener.onDrawableChanged( drawable );
}
}

protected void fireOnScaleChanged() {
if (null != mOnScaleChangeListener) {
mOnScaleChangeListener.onScaleChanged(getMinScale() != getScale());
}
}

/**
* Called just after {@link #onLayout(boolean, int, int, int, int)}
Expand Down Expand Up @@ -757,6 +777,10 @@ public float getScale() {
public float getBaseScale() {
return getScale( mBaseMatrix );
}

public boolean isUserScaled() {
return mUserScaled;
}

protected void center( boolean horizontal, boolean vertical ) {
final Drawable drawable = getDrawable();
Expand Down Expand Up @@ -869,7 +893,12 @@ protected void zoomTo( float scale, float centerX, float centerY ) {
center( true, true );
}

protected void onZoom( float scale ){}
protected void onZoom( float scale ) {
if (scale != mOldScale) {
fireOnScaleChanged();
}
mOldScale = scale;
}

protected void onZoomAnimationCompleted( float scale ){}

Expand Down