可拖动的CALayer

发布于 2024-10-19 06:14:14 字数 63 浏览 1 评论 0原文

有什么方法可以让用户拖动 CALayer 吗？如果是这样，怎么办？

（在可可 - Mac 中）

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早茶月光 2024-10-26 06:14:14

图层本身无法接收鼠标事件。您必须在包含该层的视图或视图控制器中进行事件处理。

如果 mouseDragged: 事件源自图层（请参阅 -[CALayer hitTest:] 和 -[CALayer containsPoint:] 来测试这一点），相应地调整图层的位置。您可能希望禁用隐式动画以使图层立即跟随鼠标指针（而不是因为位置属性的动画而稍微落后）：

[CATransaction begin];
[CATransaction setDisableActions:YES];
layer.position = ...;
[CATransaction commit];

Layers can not receive mouse events themselves. You would have to do the event handling in the view or view controller containing the layer.

If a mouseDragged: event originates on a layer (see -[CALayer hitTest:] and -[CALayer containsPoint:] to test this), adjust the layer's position accordingly. You will probably want to disable implicit animations to have the layer follow the mouse pointer immediately (rather than lagging a little behind because of the animation of the position property):

[CATransaction begin];
[CATransaction setDisableActions:YES];
layer.position = ...;
[CATransaction commit];

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ι不睡觉的鱼゛ 2024-10-26 06:14:14

我尝试通过代码创建一个窗口并向其中添加 CALayer，但我不明白为什么它没有显示。

NSRect rect = NSZeroRect;
    rect.size = NSMakeSize( SSRandomFloatBetween( 300.0, 200.0 ), SSRandomFloatBetween( 300.0, 200.0 ));

    NSWindow *newWin = [[NSWindow alloc] initWithContentRect:rect styleMask:NSBorderlessWindowMask backing:NSWindowBackingLocationDefault defer:YES];
    [newWin setBackgroundColor: [NSColor clearColor]];
    [newWin setOpaque:NO];
    [newWin setIgnoresMouseEvents:NO];
    [newWin setMovableByWindowBackground:YES];
    [newWin makeKeyAndOrderFront:self];

    [[newWin contentView] setWantsLayer:YES];

    NSRect contentFrame = [[newWin contentView] frame];
    CALayer *newWinLayer = [CALayer layer];
    newWinLayer.frame = NSRectToCGRect(contentFrame);

    layer.backgroundColor=CGColorCreateGenericGray(0.0f, 0.5f);
    layer.borderColor=CGColorCreateGenericGray(0.756f, 0.5f);
    layer.borderWidth=5.0;

        // Calculate random origin point
    rect.origin = SSRandomPointForSizeWithinRect( rect.size, [window frame] );

        // Set the layer frame to our random rectangle.
    layer.frame = NSRectToCGRect(rect);
    layer.cornerRadius = 25.0f;
  [newWinLayer addSublayer:layer];

窗口链接到一个大窗口，其中有一个半透明（黑色填充）窗口，可调整大小以填充屏幕。

我已经将窗口设置为可拖动，但为什么窗口中的 CALayer 不显示？

I tried creating a window through code and adding the CALayer to it, but I don't get why it's not showing.

NSRect rect = NSZeroRect;
    rect.size = NSMakeSize( SSRandomFloatBetween( 300.0, 200.0 ), SSRandomFloatBetween( 300.0, 200.0 ));

    NSWindow *newWin = [[NSWindow alloc] initWithContentRect:rect styleMask:NSBorderlessWindowMask backing:NSWindowBackingLocationDefault defer:YES];
    [newWin setBackgroundColor: [NSColor clearColor]];
    [newWin setOpaque:NO];
    [newWin setIgnoresMouseEvents:NO];
    [newWin setMovableByWindowBackground:YES];
    [newWin makeKeyAndOrderFront:self];

    [[newWin contentView] setWantsLayer:YES];

    NSRect contentFrame = [[newWin contentView] frame];
    CALayer *newWinLayer = [CALayer layer];
    newWinLayer.frame = NSRectToCGRect(contentFrame);

    layer.backgroundColor=CGColorCreateGenericGray(0.0f, 0.5f);
    layer.borderColor=CGColorCreateGenericGray(0.756f, 0.5f);
    layer.borderWidth=5.0;

        // Calculate random origin point
    rect.origin = SSRandomPointForSizeWithinRect( rect.size, [window frame] );

        // Set the layer frame to our random rectangle.
    layer.frame = NSRectToCGRect(rect);
    layer.cornerRadius = 25.0f;
  [newWinLayer addSublayer:layer];

Window is linked to a big window, with a semi-transparent (black filled) window that is resized to fill the screen.

I've made the window draggable, but why isn't the CALayer in the window showing?

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