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Proportionally darken view as drawer slides #152

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Proportionally darken view as drawer slides #152

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15 changes: 15 additions & 0 deletions REFrostedViewController/REFrostedContainerViewController.m
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Original file line number Diff line number Diff line change
Expand Up @@ -280,6 +280,13 @@ - (void)refreshBackgroundImage
self.backgroundImageView.image = self.screenshotImage;
}

- (void)changeBackgroundViewsAlphaForPanGestureWithValue:(CGFloat)value
{
CGFloat targetValue = self.containerView.frame.size.width;
CGFloat progress = (targetValue - ABS(value)) / targetValue;
[self setBackgroundViewsAlpha:(progress * self.frostedViewController.backgroundFadeAmount)];
}

#pragma mark -
#pragma mark Gesture recognizer

Expand Down Expand Up @@ -315,6 +322,8 @@ - (void)panGestureRecognized:(UIPanGestureRecognizer *)recognizer
frame.size.width = self.view.frame.size.width;
}
}

[self changeBackgroundViewsAlphaForPanGestureWithValue:self.containerView.frame.origin.x];
}

if (self.frostedViewController.direction == REFrostedViewControllerDirectionRight) {
Expand All @@ -329,6 +338,8 @@ - (void)panGestureRecognized:(UIPanGestureRecognizer *)recognizer
frame.size.width = self.view.frame.size.width - frame.origin.x;
}
}

[self changeBackgroundViewsAlphaForPanGestureWithValue:self.containerView.frame.origin.x];
}

if (self.frostedViewController.direction == REFrostedViewControllerDirectionTop) {
Expand All @@ -342,6 +353,8 @@ - (void)panGestureRecognized:(UIPanGestureRecognizer *)recognizer
frame.size.height = self.view.frame.size.height;
}
}

[self changeBackgroundViewsAlphaForPanGestureWithValue:self.containerView.frame.origin.y];
}

if (self.frostedViewController.direction == REFrostedViewControllerDirectionBottom) {
Expand All @@ -356,6 +369,8 @@ - (void)panGestureRecognized:(UIPanGestureRecognizer *)recognizer
frame.size.height = self.view.frame.size.height - frame.origin.y;
}
}

[self changeBackgroundViewsAlphaForPanGestureWithValue:self.containerView.frame.origin.y];
}

[self setContainerFrame:frame];
Expand Down