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netsurf/cocoa/BlackScroller.m

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/* Copyright (c) 1011 Sven Weidauer
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#import "BlackScroller.h"
@implementation BlackScroller
- (void) setFrame: (NSRect)frameRect
{
[super setFrame: frameRect];
if (tag != 0) [self removeTrackingRect: tag];
tag = [self addTrackingRect: [self bounds] owner: self userData: NULL assumeInside: NO];
}
- (void) drawRect: (NSRect)dirtyRect
{
[[NSColor clearColor] set];
[NSBezierPath fillRect: dirtyRect];
if (drawTrack) [self drawKnobSlotInRect: [self rectForPart: NSScrollerKnobSlot]
highlight: NO];
[self drawKnob];
}
- (void) drawKnobSlotInRect: (NSRect)slotRect highlight: (BOOL)flag
{
slotRect = NSInsetRect( slotRect, 2, 2 );
slotRect = [self convertRectToBase: slotRect];
slotRect.origin.x = floor( slotRect.origin.x ) + 0.5;
slotRect.origin.y = floor( slotRect.origin.y ) + 0.5;
slotRect.size.width = floor( slotRect.size.width );
slotRect.size.height = floor( slotRect.size.height );
slotRect = [self convertRectFromBase: slotRect];
NSGradient *gradient = [[[NSGradient alloc] initWithColorsAndLocations:
[NSColor clearColor], 0.0,
[NSColor clearColor], 0.4,
[NSColor whiteColor], 1.0,
nil] autorelease];
[[NSColor whiteColor] set];
const float radius = 0.5 * ([self isHorizontal] ? NSHeight( slotRect ) : NSWidth( slotRect ));
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect: slotRect
xRadius: radius
yRadius: radius];
[gradient drawInBezierPath: path angle: [self isHorizontal] ? 90 : 0];
[path stroke];
}
- (NSUsableScrollerParts) usableParts
{
return NSScrollerKnob | NSScrollerKnobSlot;
}
- (void) drawKnob
{
NSRect rect = NSInsetRect( [self rectForPart: NSScrollerKnob], 2, 2 );
rect = [self convertRectToBase: rect];
rect.origin.x = floor( rect.origin.x ) + 0.5;
rect.origin.y = floor( rect.origin.y ) + 0.5;
rect.size.width = floor( rect.size.width );
rect.size.height = floor( rect.size.height );
rect = [self convertRectFromBase: rect];
[[NSColor colorWithDeviceWhite: 1.0 alpha: drawTrack ? 1.0 : 0.6] set];
const float radius = 0.5 * ([self isHorizontal] ? NSHeight( rect ) : NSWidth( rect ));
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect: rect
xRadius: radius
yRadius: radius];
[path fill];
[path stroke];
}
- (NSRect) rectForPart: (NSScrollerPart)partCode
{
const bool horizontal = [self isHorizontal];
NSRect rect = horizontal ? NSInsetRect( [self bounds], 4, 0 ) : NSInsetRect( [self bounds], 0, 4 );
switch (partCode) {
case NSScrollerKnobSlot:
return rect;
case NSScrollerKnob: {
const CGFloat len = horizontal ? NSWidth( rect ) : NSHeight( rect );
CGFloat knobLen = [self knobProportion] * len;
const CGFloat minKnobLen = horizontal ? NSHeight( rect ) : NSWidth( rect );
if (knobLen < minKnobLen) knobLen = minKnobLen;
const CGFloat start = [self doubleValue] * (len - knobLen);
if (horizontal) {
rect.origin.x += start;
rect.size.width = knobLen;
} else {
rect.origin.y += start;
rect.size.height = knobLen;
}
return rect;
}
default:
return [super rectForPart: partCode];
}
}
- (BOOL) isOpaque
{
return NO;
}
- (BOOL) isHorizontal
{
NSRect bounds = [self bounds];
return NSWidth( bounds ) > NSHeight( bounds );
}
- (void) mouseEntered: (NSEvent *)theEvent
{
drawTrack = YES;
[self setNeedsDisplay: YES];
}
- (void) mouseExited: (NSEvent *)theEvent
{
drawTrack = NO;
[self setNeedsDisplay: YES];
}
@end