public ExpandHelper(Context context, Callback callback, int small, int large)
{
this.smallSize = small;
this.maximumStretch = Math.Max(smallSize, 1) * StretchInterval;
this.largeSize = large;
this.context = context;
this.callback = callback;
this.scaler = new ViewScaler();
this.gravity = GravityFlags.Top;
//this.scaleAnimation = ObjectAnimator.OfFloat (scaler, "Height", 0f);
this.scaleAnimation = ValueAnimator.OfFloat(0f);
this.scaleAnimation.Update += (sender, e) => scaler.Height = (float)e.Animation.AnimatedValue;
this.scaleAnimation.SetDuration(ExpandDuration);
AnimatorListenerAdapter glowVisibilityController = new AnimatorListener();
glowTopAnimation = ObjectAnimator.OfFloat(null, "alpha", 0f);
glowTopAnimation.AddListener(glowVisibilityController);
glowBottomAnimation = ObjectAnimator.OfFloat(null, "alpha", 0f);
glowBottomAnimation.AddListener(glowVisibilityController);
glowAnimationSet = new AnimatorSet();
glowAnimationSet.Play(glowTopAnimation).With(glowBottomAnimation);
glowAnimationSet.SetDuration(GlowDuration);
detector = new DoubleSwipeDetector(context, new GestureDetector(this));
}
public bool OnScale(DoubleSwipeDetector detector)
{
// are we scaling or dragging?
float span = Math.Abs(detector.CurrentSpan) - parent.initialTouchSpan;
span *= UseSpan ? 1f : 0f;
float drag = detector.FocusY - parent.initialTouchFocusY;
drag *= UseDrag ? 1f : 0f;
drag *= parent.gravity == GravityFlags.Bottom ? -1f : 1f;
float pull = Math.Abs(drag) + Math.Abs(span) + 1f;
float hand = drag * Math.Abs(drag) / pull + span * Math.Abs(span) / pull;
hand = hand + parent.oldHeight;
float target = hand;
hand = hand < parent.smallSize ? parent.smallSize : (hand > parent.largeSize ? parent.largeSize : hand);
hand = hand > parent.naturalHeight ? parent.naturalHeight : hand;
parent.scaler.Height = hand;
// glow if overscale
float stretch = (float)Math.Abs((target - hand) / parent.maximumStretch);
float strength = 1f / (1f + (float)Math.Pow(Math.E, -1 * ((8f * stretch) - 5f)));
parent.SetGlow(GlowBase + strength * (1f - GlowBase));
return(true);
}
public bool OnScaleBegin(DoubleSwipeDetector detector)
{
float x = detector.FocusX;
float y = detector.FocusY;
View v = null;
if (parent.eventSource != null)
{
int[] location = new int[2];
parent.eventSource.GetLocationOnScreen(location);
x += (float)location[0];
y += (float)location[1];
v = parent.callback.GetChildAtRawPosition(x, y);
}
else
{
v = parent.callback.GetChildAtPosition(x, y);
}
// your fingers have to be somewhat close to the bounds of the view in question
parent.initialTouchFocusY = detector.FocusY;
parent.initialTouchSpan = Math.Abs(detector.CurrentSpan);
parent.stretching = parent.InitScale(v);
return(parent.stretching);
}
public void OnScaleEnd(DoubleSwipeDetector detector)
{
// Intentionally empty
}
public bool OnScaleBegin(DoubleSwipeDetector detector)
{
return(true);
}
public bool OnScale(DoubleSwipeDetector detector)
{
return(false);
}
public ExpandHelper(Context context, Callback callback, int small, int large) {
this.smallSize = small;
this.maximumStretch = Math.Max (smallSize, 1) * StretchInterval;
this.largeSize = large;
this.context = context;
this.callback = callback;
this.scaler = new ViewScaler();
this.gravity = GravityFlags.Top;
//this.scaleAnimation = ObjectAnimator.OfFloat (scaler, "Height", 0f);
this.scaleAnimation = ValueAnimator.OfFloat (0f);
this.scaleAnimation.Update += (sender, e) => scaler.Height = (float)e.Animation.AnimatedValue;
this.scaleAnimation.SetDuration (ExpandDuration);
AnimatorListenerAdapter glowVisibilityController = new AnimatorListener ();
glowTopAnimation = ObjectAnimator.OfFloat (null, "alpha", 0f);
glowTopAnimation.AddListener (glowVisibilityController);
glowBottomAnimation = ObjectAnimator.OfFloat (null, "alpha", 0f);
glowBottomAnimation.AddListener (glowVisibilityController);
glowAnimationSet = new AnimatorSet();
glowAnimationSet.Play (glowTopAnimation).With(glowBottomAnimation);
glowAnimationSet.SetDuration(GlowDuration);
detector = new DoubleSwipeDetector(context, new GestureDetector (this));
}
public void OnScaleEnd(DoubleSwipeDetector detector)
{
parent.FinishScale(false);
}
public bool OnScale (DoubleSwipeDetector detector)
{
// are we scaling or dragging?
float span = Math.Abs(detector.CurrentSpan) - parent.initialTouchSpan;
span *= UseSpan ? 1f : 0f;
float drag = detector.FocusY - parent.initialTouchFocusY;
drag *= UseDrag ? 1f : 0f;
drag *= parent.gravity == GravityFlags.Bottom ? -1f : 1f;
float pull = Math.Abs(drag) + Math.Abs(span) + 1f;
float hand = drag * Math.Abs(drag) / pull + span * Math.Abs(span) / pull;
hand = hand + parent.oldHeight;
float target = hand;
hand = hand < parent.smallSize ? parent.smallSize : (hand > parent.largeSize ? parent.largeSize : hand);
hand = hand > parent.naturalHeight ? parent.naturalHeight : hand;
parent.scaler.Height = hand;
// glow if overscale
float stretch = (float) Math.Abs((target - hand) / parent.maximumStretch);
float strength = 1f / (1f + (float) Math.Pow(Math.E, -1 * ((8f * stretch) - 5f)));
parent.SetGlow(GlowBase + strength * (1f - GlowBase));
return true;
}
public bool OnScaleBegin (DoubleSwipeDetector detector)
{
float x = detector.FocusX;
float y = detector.FocusY;
View v = null;
if (parent.eventSource != null) {
int[] location = new int[2];
parent.eventSource.GetLocationOnScreen(location);
x += (float) location[0];
y += (float) location[1];
v = parent.callback.GetChildAtRawPosition(x, y);
} else {
v = parent.callback.GetChildAtPosition(x, y);
}
// your fingers have to be somewhat close to the bounds of the view in question
parent.initialTouchFocusY = detector.FocusY;
parent.initialTouchSpan = Math.Abs(detector.CurrentSpan);
parent.stretching = parent.InitScale(v);
return parent.stretching;
}
public void OnScaleEnd(DoubleSwipeDetector detector) {
// Intentionally empty
}
public bool OnScaleBegin(DoubleSwipeDetector detector) {
return true;
}
public bool OnScale(DoubleSwipeDetector detector) {
return false;
}
public void OnScaleEnd(DoubleSwipeDetector detector)
{
parent.FinishScale(false);
}