NSTextAttachmentCell Protocol Reference

Discussion

The image should be drawn so its lower-left corner lies on this point.

Discussion

The proposed line fragment is specified by lineFrag.

Discussion

theEvent is the mouse-down event. cellFrame is the region of aTextView in which you should track further mouse events. charIndex is the position in the text at which this attachment appears. aTextView is the view that received the event. It’s assumed to be an NSTextView, and should be the focus view. If flag is YES, the receiver tracks the mouse until a mouse-up event occurs; if flag is NO, it stops tracking when a mouse-dragged event occurs outside of cellFrame. Returns YES if the receiver successfully finished tracking the mouse (typically through a mouse-up event), NO otherwise (such as when the mouse is dragged outside cellFrame).

NSTextAttachmentCell’s implementation of this method calls upon aTextView’s delegate to handle the event. If theEvent is a mouse-up event for a double click, the text attachment cell sends the delegate a textView:doubleClickedOnCell:inRect: message and returns YES. Otherwise, depending on whether the user clicks or drags the cell, it sends the delegate a textView:clickedOnCell:inRect: or a textView:draggedCell:inRect:event: message and returns YES. NSTextAttachmentCell’s implementation returns NO only if flag is NO and the mouse is dragged outside of cellFrame. The delegate methods are invoked only if the delegate responds.

Discussion

theEvent is the mouse-down event. cellFrame is the region of aTextView in which further mouse events should be tracked. aTextView is the view that received the event. It’s assumed to be an NSTextView and should be the focus view. If flag is YES, the receiver tracks the mouse until a mouse-up event occurs; if flag is NO, it stops tracking when a mouse-dragged event occurs outside of cellFrame. Returns YES if the receiver successfully finished tracking the mouse (typically through a mouse-up event), NO otherwise (such as when the cursor is dragged outside cellFrame).

NSTextAttachmentCell’s implementation of this method calls upon the delegate of aTextView to handle the event. If theEvent is a mouse-up event for a double click, the text attachment cell sends the delegate a textView:doubleClickedOnCell:inRect: message and returns YES. Otherwise, depending on whether the user clicks or drags the cell, it sends the delegate a textView:clickedOnCell:inRect: or a textView:draggedCell:inRect:event: message and returns YES. NSTextAttachmentCell’s implementation returns NO only if flag is NO and the cursor is dragged outside of cellFrame. The delegate methods are invoked only if the delegate responds.

Discussion

NSTextAttachmentCell’s implementation of this method returns YES. The NSView containing the cell should invoke this method before sending a trackMouse:inRect:ofView:untilMouseUp: message.

For an attachment in an attributed string, if the attachment cell returns NO its attachment character should be selected rather than the cell being asked to track the mouse. This results in the attachment icon behaving as any regular glyph in text.

Discussion

theEvent is the event in question that occurred in cellFrame inside controlView. charIndex is the index of the attachment character within the text. If wantsToTrackMouse returns YES, this method allows the attachment to decide whether it wishes to do so for particular events.