database.mod/odbc.mod/iodbc/mac/iODBCdemo/LinkTextFieldCell.m

/*
 *  $Id$
 *
 *  The iODBC driver manager.
 *
 *  Copyright (C) 1996-2021 OpenLink Software <[email protected]>
 *  All Rights Reserved.
 *
 *  This software is released under the terms of either of the following
 *  licenses:
 *
 *      - GNU Library General Public License (see LICENSE.LGPL)
 *      - The BSD License (see LICENSE.BSD).
 *
 *  Note that the only valid version of the LGPL license as far as this
 *  project is concerned is the original GNU Library General Public License
 *  Version 2, dated June 1991.
 *
 *  While not mandated by the BSD license, any patches you make to the
 *  iODBC source code may be contributed back into the iODBC project
 *  at your discretion. Contributions will benefit the Open Source and
 *  Data Access community as a whole. Submissions may be made at:
 *
 *      http://www.iodbc.org
 *
 *
 *  GNU Library Generic Public License Version 2
 *  ============================================
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; only
 *  Version 2 of the License dated June 1991.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 *  The BSD License
 *  ===============
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 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
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 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "LinkTextFieldCell.h"

@implementation LinkTextFieldCell
@synthesize clickHandler = _clickHandler;

- (id)copyWithZone:(NSZone *)zone {
    
    LinkTextFieldCell *result = [super copyWithZone:zone];
    result->_clickHandler = [_clickHandler copy];
    return result;
}


- (void)dealloc
{
    [_clickHandler release];
    [super dealloc];
}


+ (BOOL)prefersTrackingUntilMouseUp
{
    return YES;
}

- (NSUInteger)hitTestForEvent:(NSEvent *)event inRect:(NSRect)cellFrame ofView:(NSView *)controlView {
    
    NSUInteger hitTestResult = [super hitTestForEvent:event inRect:cellFrame ofView:controlView];
    if ((hitTestResult & NSCellHitContentArea) != 0) {
        hitTestResult |= NSCellHitTrackableArea;
    }
    return hitTestResult;
}

- (void)_setAttributedStringTextColor:(NSColor *)color {
    
    NSMutableAttributedString *attrValue = [[self attributedStringValue] mutableCopy];
    NSRange range = NSMakeRange(0, [attrValue length]);
    [attrValue addAttribute:NSForegroundColorAttributeName value:color range:range];
    [self setAttributedStringValue:attrValue];
}

- (void)_handleLinkClick {
    
    NSAttributedString *attrValue = [self attributedStringValue];
    NSString *link = [attrValue attribute:NSLinkAttributeName atIndex:0 effectiveRange:NULL];
    if (link!=nil) {
        if (_clickHandler != nil)
            _clickHandler(link, self);
        else
            [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:link]];
    }
}

- (BOOL)trackMouse:(NSEvent *)theEvent inRect:(NSRect)cellFrame ofView:(NSView *)controlView untilMouseUp:(BOOL)flag {
    
    BOOL result = YES;

    NSUInteger hitTestResult = [self hitTestForEvent:theEvent inRect:cellFrame ofView:controlView];
    if ((hitTestResult & NSCellHitContentArea) != 0)
    {
        [self _setAttributedStringTextColor:[NSColor redColor]];
        result = [super trackMouse:theEvent inRect:cellFrame ofView:controlView untilMouseUp:flag];
        theEvent = [NSApp currentEvent];
        hitTestResult = [self hitTestForEvent:theEvent inRect:cellFrame ofView:controlView];

        if ((hitTestResult & NSCellHitContentArea) != 0) {
            [self _handleLinkClick];
        }
    }
    return result;
}

- (void)setBackgroundStyle:(NSBackgroundStyle)style {
    
    [super setBackgroundStyle:style];
    if (style == NSBackgroundStyleDark) {
        [self _setAttributedStringTextColor:[NSColor whiteColor]];
    }
}

- (NSArray *)accessibilityActionNames
{
    return [[super accessibilityActionNames] arrayByAddingObject:NSAccessibilityPressAction];
}

- (void)accessibilityPerformAction:(NSString *)action
{
    if ([action isEqualToString:NSAccessibilityPressAction]) {
        [self _handleLinkClick];
    } else {
        [super accessibilityPerformAction:action];
    }
}

@end