Having Draggable NSTabViewItem - objective-c

Question

is it possible to provide draggable NSTabViewItem,
Basically what i want, if i down L Button on the label of NSTabViewITem and Move, i should allow to drag the TabView item,
I want to do it for Moving of NSTabView Item and have one more feature, if user drag a Label of NSTabView Item and move it to a perticular region, then i should allow to remove that NSTabView Item,
I could able to find only one way of having PSMTab bar, but i have other features also on NSTabView Item that i will be missing if i go with that approach.

Answer 1

Thanks for looking into it,
Somehow i could able to do it.... posting some important piece of code...
1 -- Have to have Custom TabView class for Handling mouse events.
// Interface posted below,
#import <Cocoa/Cocoa.h>
typedef enum __itemDragState{
itemNotDragging = 0,
itemDragStatNormal = 0,
itemDragging = 1,
itemDropped = 2
} ItemDragStat;
#protocol CustomTabViewDelegate <NSObject>
#required
-(bool)allowDrag;
-(bool)allowDrop;
-(void)dragEnter;
-(void)acceptDrop;
-(void)draggingCancelled;
-(void)itemDropped:(id)draggedTabViewItem;
-(void)itemDroppedCompleted:(id)droppedTabViewItem;
#end
#interface CustomTab : NSTabView{
ItemDragStat eItemDragStat;
id draggedItem;
}
#property(assign)id draggedItem;
#end
Now some of the important implementation
#import "CustomTab.h"
#include "Log.h"
#implementation CustomTab
#synthesize draggedItem;
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code here.
}
return self;
}
# if 0
// don't delete it, might need later on
- (void)drawRect:(NSRect)dirtyRect
{
// Drawing code here.
}
# endif
- (void)mouseUp:(NSEvent *)theEvent{
log(" Mouse up ");
NSPoint location = [self convertPoint: [theEvent locationInWindow]
fromView: nil];
NSTabViewItem *anItem = [self tabViewItemAtPoint: location];
if ( anItem == nil ) {
// if its mouse up else where, reject dragging regardless
eItemDragStat = itemDragStatNormal;
log("Item will not be dropped");
return;
}
if ( ![anItem isEqual:[self selectedTabViewItem]]){
log("Mouse up is in nonselected item");
if ( eItemDragStat == itemDragging){
log("Item will be dropped into this ");
id droppedTabViewItem = anItem;
if ( droppedTabViewItem && [droppedTabViewItem respondsToSelector:#selector(itemDropped:)]){
id selectedTabViewItem = [self selectedTabViewItem];
[droppedTabViewItem performSelector:#selector(itemDropped:) withObject:selectedTabViewItem];
}
}
}
eItemDragStat = itemDragStatNormal;
// return;
// [super mouseUp:theEvent];
}
- (void)mouseDown:(NSEvent *)theEvent{
NSPoint location = [self convertPoint: [theEvent locationInWindow]
fromView: nil];
draggedItem = [self tabViewItemAtPoint:location];
NSTabViewItem *anItem = [self tabViewItemAtPoint: location];
if (anItem != nil && ![anItem isEqual: [self selectedTabViewItem]])
{
[self selectTabViewItem: anItem];
}
}
- (void)mouseDragged:(NSEvent *)theEvent{
NSPoint location = [self convertPoint: [theEvent locationInWindow]
fromView: nil];
id tabViewItemId = [self tabViewItemAtPoint:location];
NSTabViewItem *anItem = [self tabViewItemAtPoint: location];
if (anItem){
if (![anItem isEqual:draggedItem]){
if (tabViewItemId && [tabViewItemId respondsToSelector:#selector(allowDrag)]){
eItemDragStat = itemDragging;
}else{
// drag will be cancelled now.
// tell client item to stop dragging
if (eItemDragStat == itemDragging){
if ( draggedItem && [ draggedItem respondsToSelector:#selector(draggingCancelled)]){
[draggedItem performSelector:#selector(draggingCancelled)];
draggedItem = nil;
}
}
eItemDragStat = itemNotDragging;
// if we have +cursor then it should be reset
}
}else{
log(" Mouse dragged");
}
}else{
// dragging went elsewhere, lets close this dragging operation
if ( draggedItem && [ draggedItem respondsToSelector:#selector(draggingCancelled)]){
[draggedItem performSelector:#selector(draggingCancelled)];
draggedItem = nil;
}
// here reset the mouse pointer
eItemDragStat = itemNotDragging;
}
}
#end
It needs some more fine tuning and its going on....