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/*
 *  R.app : a Cocoa front end to: "R A Computer Language for Statistical Data Analysis"
 *  
 *  R.app Copyright notes:
 *                     Copyright (C) 2004-11  The R Foundation
 *                     written by Stefano M. Iacus and Simon Urbanek
 *
 *                  
 *  R Copyright notes:
 *                     Copyright (C) 1995-1996   Robert Gentleman and Ross Ihaka
 *                     Copyright (C) 1998-2001   The R Development Core Team
 *                     Copyright (C) 2002-2004   The R Foundation
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  A copy of the GNU General Public License is available via WWW at
 *  http://www.gnu.org/copyleft/gpl.html.  You can also obtain it by
 *  writing to the Free Software Foundation, Inc., 59 Temple Place,
 *  Suite 330, Boston, MA  02111-1307  USA.
 *
 *  Code snippets were taken from http://cocotron.googlecode.com/svn/trunk/AppKit/NSTableHeaderView.m
 *  Copyright (c) 2006-2007 Christopher J. W. Lloyd
 *
 *
 *  RDataEditorTableHeaderView.m
 *
 *  Created by Hans-J. Bibiko on 05/07/2011.
 *
 */

#import "RDataEditorTableHeaderView.h"
#import "../REditor.h"

@interface RDataEditorTableHeaderView (Private)

- (NSRect)_resizeRectBeforeColumn:(NSInteger)column;

@end

@implementation RDataEditorTableHeaderView (private)

- (NSRect)_resizeRectBeforeColumn:(NSInteger)column
{
    NSRect rect=[self headerRectOfColumn:column];

    rect.origin.x -= 2;
    rect.size.width = 6;

    return rect;
}

@end

#pragma mark -

@implementation RDataEditorTableHeaderView

-(void)mouseDown:(NSEvent *)theEvent
{
    // Submit pending changes of column names
    if([[[NSApp keyWindow] firstResponder] isKindOfClass:[NSTextView class]])
        [[_tableView delegate] textView:(NSTextView*)[[NSApp keyWindow] firstResponder] doCommandBySelector:@selector(insertNewline:)];
}

-(void)mouseUp:(NSEvent *)theEvent
{
    NSPoint location = [self convertPoint:[theEvent locationInWindow] fromView:nil];
    NSInteger clickedColumn = [self columnAtPoint:location];

    // check if delegate implemented tableView:mouseDownInHeaderOfTableColumn:
    if ([[_tableView delegate] respondsToSelector:@selector(tableView:mouseDownInHeaderOfTableColumn:)]) {
        if(clickedColumn != -1)
            [[_tableView delegate] tableView:_tableView mouseDownInHeaderOfTableColumn:[[_tableView tableColumns] objectAtIndex:clickedColumn]];
        if([[NSApp currentEvent] clickCount] > 1) {
            // deselect clicked column for editing column name and return
            [_tableView deselectAll:nil];
            return;
        }
    }

    // resizing mode
    if ([_tableView allowsColumnResizing]) {
        NSInteger i, count=[[_tableView tableColumns] count];

        // ends editing
        if ([_tableView editedColumn] != -1 || [_tableView editedRow] != -1)
            [[self window] endEditingFor:nil];

        for (i = 1; i < count; ++i) {
            if (NSMouseInRect(location, [self _resizeRectBeforeColumn:i], [self isFlipped])) {
                NSTableColumn *resizingColumn = [[_tableView tableColumns] objectAtIndex:i-1];

                if ([resizingColumn resizingMask] == NSTableColumnNoResizing)
                    return;

                _resizedColumn = i - 1;
                location=[self convertPoint:[theEvent locationInWindow] fromView:nil];
                do {
                    NSPoint newPoint;
                    NSRect newRect;
                    NSInteger q;
                    CGFloat newWidth=newPoint.x;

                    theEvent=[[self window] nextEventMatchingMask:NSLeftMouseUpMask|NSLeftMouseDraggedMask];
                    newPoint=[self convertPoint:[theEvent locationInWindow] fromView:nil];

                    newWidth=newPoint.x;
                    for (q = 0; q < _resizedColumn; ++q) {
                        newWidth -= [[[_tableView tableColumns] objectAtIndex:q] width];
                        newWidth -= [_tableView intercellSpacing].width;
                    }

                    [resizingColumn setWidth:newWidth];

                    [_tableView tile];
                    newRect.origin=[_tableView convertPoint:newPoint fromView:self];
                    newRect.size=NSMakeSize(10,10);
                    [_tableView scrollRectToVisible:newRect];

                    location=newPoint;
                } while ([theEvent type] != NSLeftMouseUp);

                [[self window] invalidateCursorRectsForView:self];

                _resizedColumn = -1;
                return;
            }
        }
    }

    // column selection including the chance to select non-continous columns via holding ⌘
    if ([_tableView allowsColumnSelection]) {
        // extend/change selection
        if ([theEvent modifierFlags] & NSCommandKeyMask) {
            // deselect previously selected?
            if ([_tableView isColumnSelected:clickedColumn])
                [_tableView deselectColumn:clickedColumn];
            else if ([_tableView allowsMultipleSelection] == YES) {
                // add to selection
                [_tableView selectColumnIndexes:[NSIndexSet indexSetWithIndex:clickedColumn] byExtendingSelection:YES];
            }
        }
        else if ([theEvent modifierFlags] & NSShiftKeyMask) {
            NSInteger firstColumn = [_tableView selectedColumn];
            NSInteger lastColumn  = clickedColumn;

            if (firstColumn == -1)
                firstColumn = 0;
            if (firstColumn > lastColumn) {
                lastColumn = firstColumn;
                firstColumn = clickedColumn;
            }

            [_tableView deselectAll:nil];
            while (firstColumn <= lastColumn)
                [_tableView selectColumnIndexes:[NSIndexSet indexSetWithIndex:firstColumn++] byExtendingSelection:YES];
        }
        else
            [_tableView selectColumnIndexes:[NSIndexSet indexSetWithIndex:clickedColumn] byExtendingSelection:NO];
    }

}

@end