大家好 - 我有一个 NSView 子类,我在 mouseDown 上以编程方式移动它。哪个有效,但有一个奇怪的副作用:
- 我单击子视图。子视图移开[GOOD]
- 我等一会儿。我不移动鼠标。由于子视图已移动,它不再在我的光标下。
- 我再次点击鼠标。
- 我希望底层窗口能够获得 mouseDown 事件(因为子视图不再在我的光标下),但是我的子视图以某种方式获得了这个事件[ODD]
- mouseDown 事件清楚地表明单击超出了我的子类[ODD]的范围
- mouseDown 事件也清楚地表明点击计数已经增加,即使我在鼠标点击之间等待了几秒钟[ODD]
...必须对我所看到的做出解释。这是我的代码 - 只需创建一个名为“OddMouse”的新 Cocoa 应用程序项目,并将以下内容复制到 OddMouseAppDelegate.h 文件中:
#import <Cocoa/Cocoa.h>
@interface OddMouseAppDelegate : NSObject <NSApplicationDelegate> {
NSWindow *window;
}
@property (assign) IBOutlet NSWindow *window;
@end
@interface OddView : NSView {
}
@end
...并将以下内容放入 OddMouseAppDelegate.m 文件中:
#import "OddMouseAppDelegate.h"
@implementation OddMouseAppDelegate
@synthesize window;
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
[[window contentView] addSubview:[[OddView alloc] init]]; } @结尾
@implementation OddView
- (id)init {
self = [super initWithFrame:NSMakeRect(100, 100, 100, 100)];
return self;
}
- (void)drawRect:(NSRect)dirtyRect {
NSBezierPath *bz = [NSBezierPath bezierPathWithRoundedRect:[self bounds]
xRadius:9 yRadius:9];
[[NSColor blueColor] set];
[bz fill];
}
- (void)mouseDown:(NSEvent *)event {
NSPoint locationInMyself = [self convertPoint: [event locationInWindow]
fromView: nil];
NSLog(@"MOUSE DOWN COORDS: x=%f y=%f, count=%i",
locationInMyself.x, locationInMyself.y, [event clickCount]);
float newX = [self frame].origin.x+100;
float newY = [self frame].origin.y+100;
[self setFrame:NSMakeRect(newX, newY, 100, 100)];
}
@end
...然后构建,然后运行,然后见证!FWIW,这是我在控制台中看到的:
10-01-15 11:38:24 PM OddMouse[4583] MOUSE DOWN COORDS: x=48.000000 y=56.000000, count=1
10-01-15 11:38:37 PM OddMouse[4583] MOUSE DOWN COORDS: x=-52.000000 y=-44.000000, count=2
10-01-15 11:38:44 PM OddMouse[4583] MOUSE DOWN COORDS: x=-152.000000 y=-144.000000, count=3
10-01-15 11:38:52 PM OddMouse[4583] MOUSE DOWN COORDS: x=-252.000000 y=-244.000000, count=4
10-01-15 11:39:03 PM OddMouse[4583] MOUSE DOWN COORDS: x=-352.000000 y=-344.000000, count=5