objective-c - Objective-C | アクションで NSBezierPath の描画と色付けを行う

Question

トラッキング エリアを持つカスタム ビュー クラスがあります。マウスがトラッキング領域に入るとベジエが色付きで描画され、マウスが領域を出るとベジエが消えます。それを消すには、ウィンドウの背景色で色を変更するしかないということを読みました。

トラッキングエリアは追加できたのですが、ベジエの描き方がわかりません。コードを入れたら

-(void)drawRect:(NSRect)dirtyRect

アプリの起動時に描画されますが、私はそうしたくありません。私はこれで試しました：

@implementation MSBezier

- (void) viewWillMoveToWindow:(NSWindow *)newWindow {
    // Setup a new tracking area when the view is added to the window.
    NSTrackingArea* trackingArea = [[NSTrackingArea alloc] initWithRect:NSMakeRect(164.5, 17.5, 270, 65) options: (NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways) owner:self userInfo:nil];
    [self addTrackingArea:trackingArea];
}

- (void) mouseEntered:(NSEvent*)theEvent {
    NSLog(@"Entered");
    color = [NSColor colorWithCalibratedRed: 0.044 green: 0.813 blue: 0.044 alpha: 0.441];
    CGFloat rectangleCornerRadius = 31;
    NSRect rectangleRect = NSMakeRect(164.5, 17.5, 270, 65);
    NSRect rectangleInnerRect = NSInsetRect(rectangleRect, rectangleCornerRadius, rectangleCornerRadius);
    rectanglePath = NSBezierPath.bezierPath;
    [rectanglePath appendBezierPathWithArcWithCenter: NSMakePoint(NSMinX(rectangleInnerRect), NSMinY(rectangleInnerRect)) radius: rectangleCornerRadius startAngle: 180 endAngle: 270];
    [rectanglePath appendBezierPathWithArcWithCenter: NSMakePoint(NSMaxX(rectangleInnerRect), NSMinY(rectangleInnerRect)) radius: rectangleCornerRadius startAngle: 270 endAngle: 360];
    [rectanglePath appendBezierPathWithArcWithCenter: NSMakePoint(NSMaxX(rectangleInnerRect), NSMaxY(rectangleInnerRect)) radius: rectangleCornerRadius startAngle: 0 endAngle: 90];
    [rectanglePath lineToPoint: NSMakePoint(NSMinX(rectangleRect), NSMaxY(rectangleRect))];
    [rectanglePath closePath];
    [color setStroke];
    [rectanglePath setLineWidth: 3];
    [rectanglePath stroke];

}

- (void) mouseExited:(NSEvent*)theEvent {
    NSLog(@"Exited");
    color = [NSColor colorWithCalibratedRed: 0.949 green: 0.949 blue: 0.949 alpha: 1];
    CGFloat rectangleCornerRadius = 31;
    NSRect rectangleRect = NSMakeRect(164.5, 17.5, 270, 65);
    NSRect rectangleInnerRect = NSInsetRect(rectangleRect, rectangleCornerRadius, rectangleCornerRadius);
    rectanglePath = NSBezierPath.bezierPath;
    [rectanglePath appendBezierPathWithArcWithCenter: NSMakePoint(NSMinX(rectangleInnerRect), NSMinY(rectangleInnerRect)) radius: rectangleCornerRadius startAngle: 180 endAngle: 270];
    [rectanglePath appendBezierPathWithArcWithCenter: NSMakePoint(NSMaxX(rectangleInnerRect), NSMinY(rectangleInnerRect)) radius: rectangleCornerRadius startAngle: 270 endAngle: 360];
    [rectanglePath appendBezierPathWithArcWithCenter: NSMakePoint(NSMaxX(rectangleInnerRect), NSMaxY(rectangleInnerRect)) radius: rectangleCornerRadius startAngle: 0 endAngle: 90];
    [rectanglePath lineToPoint: NSMakePoint(NSMinX(rectangleRect), NSMaxY(rectangleRect))];
    [rectanglePath closePath];
    [color setStroke];
    [rectanglePath setLineWidth: 3];
    [rectanglePath stroke];
}

@end

しかし、ベジエは描画されません。

ご協力いただきありがとうございます！

EDIT @うちゅうがか

これはこれまでのところ、何もしていないように見えるコードです。

@implementation MSBezier

bool shouldDrawMyPath = YES;
NSBezierPath *rectanglePath;

- (void)viewWillDraw {

    if (shouldDrawMyPath == YES) {
        NSColor *color = [NSColor colorWithCalibratedRed: 0.044 green: 0.813 blue: 0.044 alpha: 0.441];
        CGFloat rectangleCornerRadius = 31;
        NSRect rectangleRect = NSMakeRect(164.5, 17.5, 270, 65);
        NSRect rectangleInnerRect = NSInsetRect(rectangleRect, rectangleCornerRadius, rectangleCornerRadius);
        rectanglePath = NSBezierPath.bezierPath;
        [rectanglePath appendBezierPathWithArcWithCenter: NSMakePoint(NSMinX(rectangleInnerRect), NSMinY(rectangleInnerRect)) radius: rectangleCornerRadius startAngle: 180 endAngle: 270];
        [rectanglePath appendBezierPathWithArcWithCenter: NSMakePoint(NSMaxX(rectangleInnerRect), NSMinY(rectangleInnerRect)) radius: rectangleCornerRadius startAngle: 270 endAngle: 360];
        [rectanglePath appendBezierPathWithArcWithCenter: NSMakePoint(NSMaxX(rectangleInnerRect), NSMaxY(rectangleInnerRect)) radius: rectangleCornerRadius startAngle: 0 endAngle: 90];
        [rectanglePath lineToPoint: NSMakePoint(NSMinX(rectangleRect), NSMaxY(rectangleRect))];
        [rectanglePath closePath];
        [color setStroke];
        [rectanglePath setLineWidth: 3];
    } else {
        rectanglePath = nil;
    }

}

- (void)drawRect:(NSRect)dirtyRect {
    [[NSColor clearColor] set];
    NSRectFill(self.bounds);

    if (shouldDrawMyPath == YES) {
        [rectanglePath stroke];
    }
}

- (void) viewWillMoveToWindow:(NSWindow *)newWindow {
    NSTrackingArea* trackingArea = [[NSTrackingArea alloc] initWithRect:NSMakeRect(164.5, 17.5, 270, 65) options: (NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways) owner:self userInfo:nil];
    [self addTrackingArea:trackingArea];
}

- (void) mouseEntered:(NSEvent*)theEvent {
    NSLog(@"Entered");
    shouldDrawMyPath = YES;
    [self setNeedsDisplay:YES];
}

- (void) mouseExited:(NSEvent*)theEvent {
    NSLog(@"Exited");
    shouldDrawMyPath = NO;
    [self setNeedsDisplay:YES];
}

@end

私は何か間違ったことをしていると確信しています。

編集2

で色を設定する必要がありましたdrawRect:。そう：

-(void)drawRect:(NSRect)dirtyRect {
    if (shouldDrawMyPath == YES) {
        NSColor *color = [NSColor colorWithCalibratedRed: 0.044 green: 0.813 blue: 0.044 alpha: 0.441];
        [color setStroke];
        [rectanglePath stroke];
    }
}