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Help with Drag and drop NSBrowser

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Help with Drag and drop NSBrowser

Subject: Help with Drag and drop NSBrowser
From: "Ryan D. Moniz" <email@hidden>
Date: Mon, 01 Aug 2005 00:13:09 -0600

Hello,

I've searched the archives and have tried for the last few days to get an Drag and drop NSBrowser to work. The drag source works, but I can't get NSBrowser to become a drag destination. I've subclassed NSMatrix, but I still can't get it to work to become a drag destination.

Thanks,


Sincerely,

Ryan D. Moniz


//MyDocument.m
//inside -windowControllerDidLoadNib:

    //setup the browser view
    // Make the browser user our custom browser cell.
    [browser setCellClass: [FSBrowserCell class]];
    // Make the browser user our custom browser cell.
    [browser setCellClass: [FSBrowserCell class]];
    //we need to intercept dragging events to subclass NSMatrix.
    [browser setMatrixClass:[BrowserMatrix class]];

    // Tell the browser to send us messages when it is clicked.
    [browser setTarget: self];
    //    [browser setAction: @selector(browserSingleClick:)];
    [browser setDoubleAction: @selector(browserDoubleClick:)];

// Configure the number of visible columns (default max visible columns is 1). [browser setMaxVisibleColumns: MAX_VISIBLE_COLUMNS]; [browser setMinColumnWidth: NSWidth([browser bounds])/(float) MAX_VISIBLE_COLUMNS]; [browser setAllowsEmptySelection:YES]; // Prime the browser with an initial load of data. [self updateUI];


//BrowserMatrix.h

@interface BrowserMatrix : NSMatrix {

}
-(NSImage *)imageForString:(NSString *)aString;
-(NSImage *)imageForCell:(NSCell *)aCell;

//BrowserMatrix.m
@implementation BrowserMatrix

- (id)initWithFrame:(NSRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code here.
    }
    return self;
}

- (void)mouseDown:(NSEvent *)event {

    BOOL isInside = YES;
    NSPoint mouseLoc;

event = [[self window] nextEventMatchingMask: NSLeftMouseUpMask | NSLeftMouseDraggedMask]; mouseLoc = [self convertPoint:[event locationInWindow] fromView:nil]; isInside = [self mouse:mouseLoc inRect:[self bounds]]; int row, col;

switch([event type]) { case NSLeftMouseDragged: [self getRow:&row column:&col forPoint:[self convertPoint: [event locationInWindow] fromView:nil]]; [self selectCellAtRow:row column:col]; [self sendAction]; [[self window] makeFirstResponder:self]; break;

    case NSLeftMouseUp:
        if(isInside) {
        [super mouseDown:event];
        }
        break;
    default:
        //ignore any other kind of event.
        break;
    }
}

- (void)mouseDragged:(NSEvent *)event {
    //Created by Timothy Ritchey
    NSPasteboard *pb = [NSPasteboard pasteboardWithName:NSDragPboard];

    NSPoint dragPoint;

    int col, row;

[self getRow: &row column:&col forPoint:[self convertPoint: [event locationInWindow] fromView:nil]]; NSImage *cellImage = [self imageForCell:[self cellAtRow:row column:col]];

dragPoint = [self convertPoint:[event locationInWindow] fromView:nil];

[pb declareTypes:[NSArray arrayWithObjects:NSStringPboardType, nil] owner:self]; [pb setString:[self stringValue] forType:NSStringPboardType];

[self dragImage:cellImage at:dragPoint offset:NSZeroSize event:event pasteboard:pb source:self slideBack:YES]; }

-(unsigned int)draggingSourceOperationMaskForLocal:(BOOL)aFlag {
    if(aFlag) {
    NSLog(@"aFlag is true.");
        return NSDragOperationEvery;
    }
    return NSDragOperationNone;
}

-(NSImage *)imageForString:(NSString *)aString {
    //Created by Timothy Ritchey
    NSImage *image = nil;
    NSBitmapImageRep *bits = nil;

    NSRect textFrame;

    NSCell *cell = [[NSCell alloc] initTextCell:aString];
    //NSCell *cell = [[NSCell alloc] initImageCell:[self image]];

    textFrame.size = [cell cellSize];
    textFrame.origin = NSZeroPoint;

    image = [[NSImage alloc] initWithSize:textFrame.size];
    [image setBackgroundColor:[NSColor blueColor]];

[image lockFocus]; [cell drawInteriorWithFrame:textFrame inView:[NSView focusView]]; bits = [[NSBitmapImageRep alloc] initWithFocusedViewRect:textFrame]; [image unlockFocus];

    [bits release];
    return [image autorelease];
}

-(NSImage *)imageForCell:(NSCell *)aCell {
    NSImage *image = nil;
    NSBitmapImageRep *bits = nil;

    NSRect textFrame;

    textFrame.size = [aCell cellSize];
    textFrame.origin = NSZeroPoint;

    image = [[NSImage alloc] initWithSize:textFrame.size];
    [image setBackgroundColor:[NSColor blueColor]];

[image lockFocus]; [aCell drawInteriorWithFrame:textFrame inView:[NSView focusView]]; bits = [[NSBitmapImageRep alloc] initWithFocusedViewRect:textFrame]; [image unlockFocus];


    [bits release];
    return [image autorelease];
}


@end


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