Highlight selected shape

ole · Feb 1, 2012 · 528223d · 528223d
1 parent 418d4fd
commit 528223d
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Showing 3 changed files with 31 additions and 1 deletion.
diff --git a/PathHitTesting/DrawingView.h b/PathHitTesting/DrawingView.h
@@ -27,4 +27,7 @@
 - (UIBezierPath *)drawingView:(DrawingView *)drawingView pathForShapeAtIndex:(NSUInteger)shapeIndex;
 - (UIColor *)drawingView:(DrawingView *)drawingView lineColorForShapeAtIndex:(NSUInteger)shapeIndex;
 
+@optional
+- (NSUInteger)indexOfSelectedShapeInDrawingView:(DrawingView *)drawingView;
+
 @end
diff --git a/PathHitTesting/DrawingView.m b/PathHitTesting/DrawingView.m
@@ -27,13 +27,26 @@ - (void)reloadDataInRect:(CGRect)rect
 - (void)drawRect:(CGRect)rect
 {
     NSUInteger numberOfShapes = [self.dataSource numberOfShapesInDrawingView:self];
+    NSUInteger indexOfSelectedShape = NSNotFound;
+    if ([self.dataSource respondsToSelector:@selector(indexOfSelectedShapeInDrawingView:)]) {
+        indexOfSelectedShape = [self.dataSource indexOfSelectedShapeInDrawingView:self];
+    }
+
     for (NSUInteger shapeIndex = 0; shapeIndex < numberOfShapes; shapeIndex++) {
         UIBezierPath *path = [self.dataSource drawingView:self pathForShapeAtIndex:shapeIndex];
         if (CGRectIntersectsRect(rect, CGRectInset(path.bounds, -path.lineWidth, -path.lineWidth))) 
         {
             UIColor *lineColor = [self.dataSource drawingView:self lineColorForShapeAtIndex:shapeIndex];
             [lineColor setStroke];
-            [path stroke];
+
+            if (shapeIndex == indexOfSelectedShape) {
+                CGFloat dashStyle[] = { 5.0f, 5.0f };
+                UIBezierPath *pathCopy = [path copy];
+                [pathCopy setLineDash:dashStyle count:2 phase:0];
+                [pathCopy stroke];
+            } else {
+                [path stroke];
+            }
         }
     }
 }

diff --git a/PathHitTesting/ViewController.m b/PathHitTesting/ViewController.m
@@ -103,6 +103,15 @@ - (void)addShape:(Shape *)newShape
     [self.drawingView reloadDataInRect:newShape.totalBounds];
 }
 
+- (void)setSelectedShape:(Shape *)selectedShape
+{
+    CGRect oldSelectionBounds = self.selectedShape.totalBounds;
+    CGRect newSelectionBounds = selectedShape.totalBounds;
+    CGRect rectToRedraw = CGRectUnion(oldSelectionBounds, newSelectionBounds);
+    _selectedShape = selectedShape;
+    [_drawingView setNeedsDisplayInRect:rectToRedraw];
+}
+
 
 #pragma mark - Hit Testing
 
@@ -170,4 +179,9 @@ - (UIColor *)drawingView:(DrawingView *)drawingView lineColorForShapeAtIndex:(NS
     return shape.lineColor;
 }
 
+- (NSUInteger)indexOfSelectedShapeInDrawingView:(DrawingView *)drawingView
+{
+    return [self.shapes indexOfObject:self.selectedShape];
+}
+
 @end