How to create an ImageView as drag and drop? - applescript-objc

Question

I would like to know how to make an ImageView drag and drop,
I will drag a certain file to an ImageView and it will render
an action.
I know I can use the code below in a Script Editor and save it as a
application could then drag the files into it and do an action but would like to
know how it would be done in an ImageView.
Thanks in advance!
on open myItems
repeat with one_item in myItems
---Blablabla
end repeat
end open

Answer 1

An NSImageView's parent class is NSControl, so like any other control it has a target/action you can specify, for example:
use AppleScript version "2.4" -- Yosemite (10.10) or later
use framework "Foundation"
use scripting additions
property mainWindow : missing value
on run -- Script Editor example
my performSelectorOnMainThread:"doWindowStuff" withObject:(missing value) waitUntilDone:true
end run
on doWindowStuff() -- window stuff needs to be done on the main thread
try
set my mainWindow to makeWindow out of {{0, 0}, {400, 200}} given title:"Drag an image:"
set imageView to makeImageView out of {{100, 50}, {200, 100}}
mainWindow's contentView's addSubview:imageView
mainWindow's makeKeyAndOrderFront:me
on error errmess
display alert "Error" message errmess
end try
end doWindowStuff
to makeWindow out of frame given title:title : "" -- make and return a window
tell (current application's NSWindow's alloc()'s initWithContentRect:frame styleMask:7 backing:2 defer:yes) -- styleMask of 7 includes title, close and minimize buttons
if first item of frame is {0, 0} then tell it to |center|()
its setAutorecalculatesKeyViewLoop:true
its setTitle:title
return it
end tell
end makeWindow
to makeImageView out of frame -- make and return an image view
tell (current application's NSImageView's alloc()'s initWithFrame:frame)
its setTarget:me
its setAction:"imageDragged:"
its setEditable:true
its setImageScaling:(current application's NSImageScaleProportionallyUpOrDown)
return it
end tell
end makeImageView
on imageDragged:sender
activate me
display dialog "An image was dragged into the image view."
end imageDragged:
To do something like get the file path for a dropped image, NSImageView will need to be subclassed. For an Xcode project, add a new .applescript file for the subclass, and set it as the class of your imageView in IB's Identity Inspector:
script MyImageView -- NSImageView subclass
property parent : class "NSImageView"
property imagePath : missing value
on draggingEntered:sender
# additional stuff as desired
return current application's NSDragOperationCopy
end draggingEntered:
on performDragOperation:sender
set pasteboard to sender's draggingPasteboard()
set theOptions to {NSPasteboardURLReadingFileURLsOnlyKey:1}
set imageURLs to pasteboard's readObjectsForClasses:{current application's |NSURL|} options:theOptions
set draggedURL to first item of (imageURLs as list)
set my imagePath to draggedURL as text
return true -- data accepted
end performDragOperation:
end script
You should also register the acceptable drag type(s) for your imageView somewhere in the AppDelegate's setup:
imageView's registerForDraggedTypes:{"public.image"}
The file path will then be available in the imageView's imagePath property when you drag something to the view. See Apple's Drag and Drop Programming Topics for more information.