我正在尝试绘制一个自定义的 NSScroller 并且我几乎得到了我想要工作的所有东西但是，当我尝试摆脱旋钮时，它只会不断地重新绘制旋钮：
那是我使用 drawRect: 绘制背景的时候。当我删除 drawRect: 我得到：
我似乎仍然无法摆脱旋钮插槽。这是我的所有代码：
#import "UIScroller.h"
@interface UIScroller (Private)
- (void)drawKnobSlot;
@end
@implementation UIScroller
- (BOOL)isVertical {
NSRect bounds = [self bounds];
return NSHeight(bounds) < NSWidth(bounds);
}
+ (CGFloat)scrollerWidth {
return 13;
}
+ (CGFloat)scrollerWidthForControlSize:(NSControlSize)controlSize {
return 13;
}
/*
- (void)drawRect:(NSRect)aRect;
{
//[[NSColor blueColor] set];
NSRectFill([self bounds]);
[self drawKnobSlot];
}
*/
- (void)drawKnobSlot;
{
NSRect slotRect = [self rectForPart:NSScrollerKnobSlot];
if ([self isVertical])
NSDrawThreePartImage(slotRect, [NSImage imageNamed:@"lazyarrow"], [NSImage imageNamed:@"lazyarrow"], [NSImage imageNamed:@"lazyarrow"], YES, NSCompositeSourceOver, 1, NO);
else
NSDrawThreePartImage(slotRect, [NSImage imageNamed:@"lazyarrow"], [NSImage imageNamed:@"lazyarrow"], [NSImage imageNamed:@"lazyarrow"], NO, NSCompositeSourceOver, 1, NO);
}
- (void)drawPart:(NSScrollerPart)part highlight:(BOOL)highlight {
//NSLog(@"drawPart:%@ highlight:%@", NSScrollerPartDescription(part), highlight ? @"YES":@"NO");
NSRect partRect = [self rectForPart:part];
switch (part) {
case NSScrollerKnob: {
assert(!highlight);
if ([self isVertical]) {
partRect.origin.y++;
partRect.size.height -= 2;
} else {
// FIXME really vertical
partRect.origin.x++;
partRect.size.width -= 2;
}
NSRect newRect = NSMakeRect(partRect.origin.x+4, [self isVertical] ? partRect.origin.y+3 : partRect.origin.y, partRect.size.width - 6,[self isVertical] ? partRect.size.height-5 : partRect.size.height - 4);
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:newRect
xRadius:[self isVertical] ? 4: 4
yRadius:[self isVertical] ? 4 : 4];
[path setLineWidth:2];
[[NSColor colorWithDeviceRed:0.114 green:0.114 blue:0.114 alpha:.6] set];
[path fill];
[[NSColor colorWithDeviceWhite:1.0
alpha:0.100] set];
[path addClip];
[path stroke];
// NSBezierPath *knobPath = [NSBezierPath bezierPathWithRoundedRect:partRect
// xRadius:5
// yRadius:5];
//[[NSColor colorWithDeviceRed:89./255. green:105./255. blue:131./255. alpha:1.] set];
/*
NSGradient *gradient = [[[NSGradient alloc] initWithColorsAndLocations:
[NSColor colorWithDeviceRed:(89.0/255.0) green:(105/255.0) blue:(131/255.0) alpha:1.0], 0.0,
[NSColor colorWithDeviceRed:(89.0/255.0) green:(105/255.0) blue:(131/255.0) alpha:1.0], 0.0768,
[NSColor colorWithDeviceRed:(154.0/255.0) green:(169/255.0) blue:(190/255.0) alpha:1.0], 0.0769,
[NSColor colorWithDeviceRed:(94.0/255.0) green:(113/255.0) blue:(144/255.0) alpha:1.0], 0.9231,
[NSColor colorWithDeviceRed:(61.0/255.0) green:(80/255.0) blue:(111/255.0) alpha:1.0], 0.9232,
[NSColor colorWithDeviceRed:(61.0/255.0) green:(80/255.0) blue:(111/255.0) alpha:1.0], 1.0,
nil
] autorelease];
*/
// [knobPath setLineWidth:2.0];
// [knobPath stroke];
//[gradient drawInBezierPath:knobPath
// angle:[self isVertical] ? 90. : 0.];
//--
/*[[NSColor colorWithDeviceRed:0. green:0. blue:255/128 alpha:1.0] set];
[[NSBezierPath bezierPathWithRoundedRect:partRect
xRadius:6.0
yRadius:6.0] fill];*/
//NSRectFill(partRect);
} break;
case NSScrollerIncrementLine: {
} break;
case NSScrollerKnobSlot: {
NSAssert(!highlight, nil);
#if 0
[[NSColor darkGrayColor] set];
// NSRectFill(partRect);
#else
partRect = [self bounds];
/*
NSGradient *gradient = [[[NSGradient alloc] initWithColorsAndLocations:
[NSColor colorWithDeviceRed:(89.0/255.0) green:(105/255.0) blue:(131/255.0) alpha:1.0], 0.0,
[NSColor colorWithDeviceRed:(89.0/255.0) green:(105/255.0) blue:(131/255.0) alpha:1.0], 0.0768,
[NSColor colorWithDeviceRed:(154.0/255.0) green:(169/255.0) blue:(190/255.0) alpha:1.0], 0.0769,
[NSColor colorWithDeviceRed:(94.0/255.0) green:(113/255.0) blue:(144/255.0) alpha:1.0], 0.9231,
[NSColor colorWithDeviceRed:(61.0/255.0) green:(80/255.0) blue:(111/255.0) alpha:1.0], 0.9232,
[NSColor colorWithDeviceRed:(61.0/255.0) green:(80/255.0) blue:(111/255.0) alpha:1.0], 1.0,
nil
] autorelease];
*/
NSGradient *gradient = [[[NSGradient alloc] initWithColorsAndLocations:
[NSColor colorWithDeviceRed:(161.0/255.0) green:(161/255.0) blue:(161/255.0) alpha:1.0], 0.0,
[NSColor colorWithDeviceRed:(186.0/255.0) green:(186/255.0) blue:(186/255.0) alpha:1.0], 0.067,
[NSColor colorWithDeviceRed:(219.0/255.0) green:(219/255.0) blue:(219/255.0) alpha:1.0], 0.2,
[NSColor colorWithDeviceRed:(230.0/255.0) green:(230/255.0) blue:(230/255.0) alpha:1.0], 0.333,
[NSColor colorWithDeviceRed:(240.0/255.0) green:(240/255.0) blue:(240/255.0) alpha:1.0], 0.667,
[NSColor colorWithDeviceRed:(223.0/255.0) green:(223/255.0) blue:(223/255.0) alpha:1.0], 0.8,
[NSColor colorWithDeviceRed:(204.0/255.0) green:(204/255.0) blue:(204/255.0) alpha:1.0], 0.867,
[NSColor colorWithDeviceRed:(178.0/255.0) green:(178/255.0) blue:(178/255.0) alpha:1.0], 1.0,
nil
] autorelease];
// CGContextRef context = (CGContextRef) [[NSGraphicsContext currentContext] graphicsPort];
// CGContextSetRGBFillColor(context, 0,0,0,0);
// CGContextFillRect(context, partRect);
[gradient drawInRect:partRect angle:[self isVertical] ? 90. : 0.];
// NSRectFillUsingOperation(partRect, NSCompositeClear);
#endif
}
}}
- (void)drawKnob
{
[self drawPart:NSScrollerKnob highlight:NO];
[self setArrowsPosition:NSScrollerArrowsNone];
/*
NSRect knobRect = [self rectForPart:NSScrollerKnob];
NSRect newRect = NSMakeRect(knobRect.origin.x+3, knobRect.origin.y, knobRect.size.width - 6, knobRect.size.height);
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:newRect
xRadius:5
yRadius:5];
[path setLineWidth:2];
[[NSColor colorWithDeviceRed:0.114 green:0.114 blue:0.114 alpha:0.3] set];
[path fill];
[[NSColor colorWithDeviceWhite:1.0
alpha:0.100] set];
[path addClip];
[path stroke];
*/
}
- (void)drawKnobSlotInRect:(NSRect)slotRect highlight:(BOOL)flag;
{
[self drawPart:NSScrollerKnobSlot highlight:NO];
/*
NSRect newRect = NSMakeRect(slotRect.origin.x, slotRect.origin.y, slotRect.size.width, slotRect.size.height);
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:newRect
xRadius:10
yRadius:10];
[path setLineWidth:2];
[[NSColor colorWithDeviceRed:0.114 green:0.114 blue:0.114 alpha:0.3] set];
[path fill];
[[NSColor colorWithDeviceWhite:1.0
alpha:0.100] set];
[path addClip];
[path stroke];
*/
}
@end
任何人都知道如何解决这个问题，使它最终看起来像 iOS 的 UIScrollView/UIScroller？：
还是像Sparrow的自定义 NSScrollers 一样？：
