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CollectionView now supports internal dragging; dragging items from th…
…e collectionview onto other items in the view
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,19 @@ | ||
| // | ||
| // BCCollectionView+Dragging.h | ||
| // Fontcase | ||
| // | ||
| // Created by Pieter Omvlee on 13/12/2010. | ||
| // Copyright 2010 Bohemian Coding. All rights reserved. | ||
| // | ||
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| #import "BCCollectionView.h" | ||
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| @interface BCCollectionView (BCCollectionView_Dragging) | ||
| - (void)initiateDraggingSessionWithEvent:(NSEvent *)anEvent; | ||
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| //delegate shortcuts | ||
| - (BOOL)delegateSupportsDragForItemsAtIndexes:(NSIndexSet *)indexSet; | ||
| - (void)delegateWriteIndexes:(NSIndexSet *)indexSet toPasteboard:(NSPasteboard *)pasteboard; | ||
| - (BOOL)delegateCanDrop:(id)draggingInfo onIndex:(NSUInteger)index; | ||
| - (void)setDragHoverIndex:(NSInteger)hoverIndex; | ||
| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| // | ||
| // BCCollectionView+Dragging.m | ||
| // Fontcase | ||
| // | ||
| // Created by Pieter Omvlee on 13/12/2010. | ||
| // Copyright 2010 Bohemian Coding. All rights reserved. | ||
| // | ||
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| #import "BCCollectionView+Dragging.h" | ||
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| @implementation BCCollectionView (BCCollectionView_Dragging) | ||
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| - (void)initiateDraggingSessionWithEvent:(NSEvent *)anEvent | ||
| { | ||
| NSUInteger index = [self indexOfItemAtPoint:mouseDownLocation]; | ||
| NSRect itemRect = [self rectOfItemAtIndex:index]; | ||
| NSView *currentView = [[self viewControllerForItemAtIndex:index] view]; | ||
| NSData *imageData = [currentView dataWithPDFInsideRect:NSMakeRect(0,0,NSWidth(itemRect),NSHeight(itemRect))]; | ||
| NSImage *pdfImage = [[[NSImage alloc] initWithData:imageData] autorelease]; | ||
| NSImage *dragImage = [[NSImage alloc] initWithSize:[pdfImage size]]; | ||
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| [dragImage lockFocus]; | ||
| [pdfImage drawAtPoint:NSZeroPoint fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:0.5]; | ||
| [dragImage unlockFocus]; | ||
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| NSPasteboard *pasteboard = [NSPasteboard pasteboardWithName:NSDragPboard]; | ||
| [self delegateWriteIndexes:selectionIndexes toPasteboard:pasteboard]; | ||
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| [self dragImage:[dragImage autorelease] | ||
| at:NSMakePoint(NSMinX(itemRect), NSMaxY(itemRect)) | ||
| offset:NSMakeSize(0, 0) | ||
| event:anEvent | ||
| pasteboard:pasteboard | ||
| source:self | ||
| slideBack:YES]; | ||
| } | ||
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| - (NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)sender | ||
| { | ||
| if (dragHoverIndex != NSNotFound) | ||
| [self setNeedsDisplayInRect:[self rectOfItemAtIndex:dragHoverIndex]]; | ||
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| NSPoint mouse = [self convertPoint:[sender draggingLocation] fromView:nil]; | ||
| NSUInteger index = [self indexOfItemAtPoint:mouse]; | ||
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| NSDragOperation operation = NSDragOperationNone; | ||
| if ([selectionIndexes containsIndex:index]) | ||
| [self setDragHoverIndex:NSNotFound]; | ||
| else if ([self delegateCanDrop:sender onIndex:index]) { | ||
| [self setDragHoverIndex:index]; | ||
| operation = NSDragOperationMove; | ||
| } else | ||
| [self setDragHoverIndex:NSNotFound]; | ||
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| if (dragHoverIndex != NSNotFound) | ||
| [self setNeedsDisplayInRect:[self rectOfItemAtIndex:dragHoverIndex]]; | ||
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| return operation; | ||
| } | ||
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| - (void)draggingEnded:(id <NSDraggingInfo>)sender | ||
| { | ||
| if (dragHoverIndex != NSNotFound) | ||
| [self setNeedsDisplayInRect:[self rectOfItemAtIndex:dragHoverIndex]]; | ||
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| [self setDragHoverIndex:NSNotFound]; | ||
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| if ([delegate respondsToSelector:@selector(collectionView:draggingEnded:)]) | ||
| [delegate collectionView:self draggingEnded:sender]; | ||
| } | ||
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| - (BOOL)performDragOperation:(id <NSDraggingInfo>)sender | ||
| { | ||
| if ([delegate respondsToSelector:@selector(collectionView:performDragOperation:onViewController:forItem:)]) | ||
| return [delegate collectionView:self | ||
| performDragOperation:sender | ||
| onViewController:[self viewControllerForItemAtIndex:dragHoverIndex] | ||
| forItem:[contentArray objectAtIndex:dragHoverIndex]]; | ||
| else | ||
| return NO; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Delegate Shortcuts | ||
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| - (void)setDragHoverIndex:(NSInteger)hoverIndex | ||
| { | ||
| if (hoverIndex != dragHoverIndex) { | ||
| if (dragHoverIndex != NSNotFound) | ||
| [self setNeedsDisplayInRect:[self rectOfItemAtIndex:dragHoverIndex]]; | ||
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| if ([delegate respondsToSelector:@selector(collectionView:dragExitedViewController:)]) | ||
| [delegate collectionView:self dragExitedViewController:[self viewControllerForItemAtIndex:dragHoverIndex]]; | ||
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| dragHoverIndex = hoverIndex; | ||
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| if ([delegate respondsToSelector:@selector(collectionView:dragEnteredViewController:)]) | ||
| [delegate collectionView:self dragEnteredViewController:[self viewControllerForItemAtIndex:dragHoverIndex]]; | ||
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| if (dragHoverIndex != NSNotFound) | ||
| [self setNeedsDisplayInRect:[self rectOfItemAtIndex:dragHoverIndex]]; | ||
| } | ||
| } | ||
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| - (BOOL)delegateSupportsDragForItemsAtIndexes:(NSIndexSet *)indexSet | ||
| { | ||
| if ([delegate respondsToSelector:@selector(collectionView:canDragItemsAtIndexes:)]) | ||
| return [delegate collectionView:self canDragItemsAtIndexes:indexSet]; | ||
| return NO; | ||
| } | ||
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| - (void)delegateWriteIndexes:(NSIndexSet *)indexSet toPasteboard:(NSPasteboard *)pasteboard | ||
| { | ||
| if ([delegate respondsToSelector:@selector(collectionView:writeItemsAtIndexes:toPasteboard:)]) | ||
| [delegate collectionView:self writeItemsAtIndexes:indexSet toPasteboard:pasteboard]; | ||
| } | ||
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| - (BOOL)delegateCanDrop:(id)draggingInfo onIndex:(NSUInteger)index | ||
| { | ||
| if ([delegate respondsToSelector:@selector(collectionView:validateDrop:onItemAtIndex:)]) | ||
| return [delegate collectionView:self validateDrop:draggingInfo onItemAtIndex:index]; | ||
| else | ||
| return NO; | ||
| } | ||
|
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| @end |
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