lazily create transparent overlay, remove when not needed

steipete · Sep 24, 2011 · 7563c43 · 7563c43
1 parent 35bb907
commit 7563c43
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Showing 2 changed files with 20 additions and 6 deletions.
diff --git a/PSStackedView/PSSVContainerView.h b/PSStackedView/PSSVContainerView.h
@@ -31,6 +31,9 @@ enum {
 /// limit to max width
 - (CGFloat)limitToMaxWidth:(CGFloat)maxWidth;
 
+/// add rounded masks. 
+/// currently unused, because this needs offscreen-rendering, which is crazy slow
+/// as a workaround, fake te rounded corners yourself
 - (void)addMaskToCorners:(UIRectCorner)corners;
 - (void)removeMask;
 
@@ -40,6 +43,7 @@ enum {
 /// set shadow sides
 @property(nonatomic, assign) PSSVSide shadow;
 
+/// view controller that is being incapsulated
 @property(nonatomic, retain) UIViewController *controller;
 
 /// darken down the view if it's not fully visible

diff --git a/PSStackedView/PSSVContainerView.m b/PSStackedView/PSSVContainerView.m
@@ -76,12 +76,6 @@ + (PSSVContainerView *)containerViewWithController:(UIViewController *)controlle
 
 - (id)initWithFrame:(CGRect)frame {
     if ((self = [super initWithFrame:frame])) {
-        transparentView_ = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
-        transparentView_.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
-        transparentView_.backgroundColor = [UIColor blackColor];
-        transparentView_.alpha = 0.f;
-        transparentView_.userInteractionEnabled = NO;
-        [self addSubview:transparentView_];
     }
     return self;
 }
@@ -230,7 +224,23 @@ - (void)setShadow:(PSSVSide)shadow {
 }
 
 - (void)setDarkRatio:(CGFloat)darkRatio {
+    BOOL isTransparent = darkRatio > 0.01f;
+
+    if (isTransparent && !transparentView_) {
+        transparentView_ = [[UIView alloc] initWithFrame:CGRectMake(0.f, 0.f, self.width, self.height)];
+        transparentView_.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+        transparentView_.backgroundColor = [UIColor blackColor];
+        transparentView_.alpha = 0.f;
+        transparentView_.userInteractionEnabled = NO;
+        [self addSubview:transparentView_];
+    }
+
     transparentView_.alpha = darkRatio;
+    if (isTransparent) {
+        [self addSubview:transparentView_];
+    }else {
+        [transparentView_ removeFromSuperview];
+    }
 }
 
 - (CGFloat)darkRatio {