Re: drag and drop
Re: drag and drop
- Subject: Re: drag and drop
- From: David Kennedy <email@hidden>
- Date: Tue, 7 Mar 2006 13:13:11 +0000
On 7 Mar 2006, at 12:10, Valerio Ferrucci wrote:
I followed the steps in "http://developer.apple.com/documentation/
Cocoa/Conceptual/DragandDrop/index.html".
In IB I put a CustomView in the window and set as CustomClass of
the view "MyClass" (extending NSView).
Then I declared in "MyClass" the methods:
initWithFrame
draggingEntered
draggingExited
performDragOperation
but the last three methods are never called!
Am I forgetting something?
This is my initWithFrame method (I'm beginning with .mov files):
- (id)initWithFrame:(NSRect)frameRect
{
if ((self = [super initWithFrame:frameRect]) != nil)
{
NSString *pboardType = NSCreateFileContentsPboardType(@"mov");
NSArray *dragTypes = [NSArray arrayWithObject:pboardType];
[self registerForDraggedTypes:dragTypes];
highlight = NO;
}
return self;
}
The code, and the example are correct if you are dealing with a
pasteboard that you know has file content data on it (e.g. your
application has written it there).
But often (for efficiency) this is not the case.
For instance, when you drag files from the finder - the file content
does not tend to be included. To handle this, you can use the
"Dragging File Paths" example, then process the file paths (e.g. load
the file's data) as required.
Hope this helps,
Dave
------
David Kennedy (http://www.zenopolis.com)
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| | >drag and drop (From: Valerio Ferrucci <email@hidden>) |