cocoa - NSPopOverのようなアニメーションを作成します

Question

親ウィンドウに子として表示されるカスタムWindowオブジェクトで作業しています。
このオブジェクトでは、NSPopoverのようなアニメーションを作成したいと思います。

私の最初のアイデアは、Core Animationを使用してアニメーション化し、最終的に実際のウィンドウを表示するのではなく、子ウィンドウのスクリーンショットを作成することです。

実装を懇願する前に、より良い方法が存在するかどうか、そしてあなたが私の解決策についてどう思うかを知りたいと思います。

Answer 1

それは些細なことではありません。これが私がそれをする方法です：

@interface ZoomWindow : NSWindow
{
    CGFloat animationTimeMultiplier;
}

@property (nonatomic, readwrite, assign) CGFloat animationTimeMultiplier;

@end

@implementation ZoomWindow

@synthesize animationTimeMultiplier;

- (NSTimeInterval)animationResizeTime: (NSRect)newWindowFrame
{
    float multiplier = animationTimeMultiplier;

    if (([[NSApp currentEvent] modifierFlags] & NSShiftKeyMask) != 0) {
        multiplier *= 10;
    }

    return [super animationResizeTime: newWindowFrame] * multiplier;
}

@end

@implementation NSWindow (PecuniaAdditions)

- (ZoomWindow*)createZoomWindowWithRect: (NSRect)rect
{
    // Code mostly from http://www.noodlesoft.com/blog/2007/06/30/animation-in-the-time-of-tiger-part-1/
    // Copyright 2007 Noodlesoft, L.L.C.. All rights reserved.
    // The code is provided under the MIT license.

    // The code has been extended to support layer-backed views. However, only the top view is
    // considered here. The code might not produce the desired output if only a subview has its layer
    // set. So better set it on the top view (which should cover most cases).

    NSImageView *imageView;
    NSImage *image;
    NSRect frame;
    BOOL isOneShot;

    frame = [self frame];

    isOneShot = [self isOneShot];
    if (isOneShot) {
        [self setOneShot: NO];
    }

    BOOL hasLayer = [[self contentView] wantsLayer];
    if ([self windowNumber] <= 0) // <= 0 if hidden
    {
        // We need to temporarily switch off the backing layer of the content view or we get
        // context errors on the second or following runs of this code.
        [[self contentView] setWantsLayer: NO];

        // Force window device. Kinda crufty but I don't see a visible flash
        // when doing this. May be a timing thing wrt the vertical refresh.
        [self orderBack: self];
        [self orderOut: self];

        [[self contentView] setWantsLayer: hasLayer];
    }

    // Capture the window into an off-screen bitmap.
    image = [[NSImage alloc] initWithSize: frame.size];
    [[self contentView] lockFocus];
    NSBitmapImageRep* rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect: NSMakeRect(0.0, 0.0, frame.size.width, frame.size.height)];
    [[self contentView] unlockFocus];
    [image addRepresentation: rep];

    // If the content view is layer-backed the above initWithFocusedViewRect call won't get the content
    // of the view (seems it doesn't work for CALayers). So we need a second call that captures the
    // CALayer content and copies it over the captured image (compositing so the window frame and its content).
    if (hasLayer)
    {
        NSRect contentFrame = [[self contentView] bounds];
        int bitmapBytesPerRow = 4 * contentFrame.size.width;

        CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
        CGContextRef context = CGBitmapContextCreate (NULL,
                                                      contentFrame.size.width,
                                                      contentFrame.size.height,
                                                      8,
                                                      bitmapBytesPerRow,
                                                      colorSpace,
                                                      kCGImageAlphaPremultipliedLast);
        CGColorSpaceRelease(colorSpace);

        [[[self contentView] layer] renderInContext: context];
        CGImageRef img = CGBitmapContextCreateImage(context);
        CFRelease(context);
        NSImage *subImage = [[NSImage alloc] initWithCGImage: img size: contentFrame.size];
        CFRelease(img);
        [image lockFocus];
        [subImage drawAtPoint: NSMakePoint(0, 0)
                     fromRect: NSMakeRect(0, 0, contentFrame.size.width, contentFrame.size.height)
                    operation: NSCompositeCopy
                     fraction: 1];
        [image unlockFocus];
    }

    ZoomWindow *zoomWindow = [[ZoomWindow alloc] initWithContentRect: rect
                                                           styleMask: NSBorderlessWindowMask
                                                             backing: NSBackingStoreBuffered
                                                               defer: NO];
    zoomWindow.animationTimeMultiplier = 0.3;
    [zoomWindow setBackgroundColor: [NSColor colorWithDeviceWhite: 0.0 alpha: 0.0]];
    [zoomWindow setHasShadow: [self hasShadow]];
    [zoomWindow setLevel: [self level]];
    [zoomWindow setOpaque: NO];
    [zoomWindow setReleasedWhenClosed: NO];
    [zoomWindow useOptimizedDrawing: YES];

    imageView = [[NSImageView alloc] initWithFrame: [zoomWindow contentRectForFrameRect: frame]];
    [imageView setImage: image];
    [imageView setImageFrameStyle: NSImageFrameNone];
    [imageView setImageScaling: NSScaleToFit];
    [imageView setAutoresizingMask: NSViewWidthSizable | NSViewHeightSizable];

    [zoomWindow setContentView: imageView];

    [self setOneShot: isOneShot];

    return zoomWindow;
}

- (void)fadeIn
{
    [self setAlphaValue: 0.f];
    [self orderFront: nil];

    [NSAnimationContext beginGrouping];
    [[NSAnimationContext currentContext] setDuration: 0.3];
    [[self animator] setAlphaValue: 1.f];
    [NSAnimationContext endGrouping];
}

- (void)zoomInWithOvershot: (NSRect)overshotFrame withFade: (BOOL)fade makeKey: (BOOL)makeKey
{
    [self setAlphaValue: 0];

    NSRect frame = [self frame];
    ZoomWindow *zoomWindow = [self createZoomWindowWithRect: frame];
    zoomWindow.alphaValue = 0;

    [zoomWindow orderFront: self];

    NSDictionary *windowResize = @{NSViewAnimationTargetKey: zoomWindow,
                                  NSViewAnimationEndFrameKey: [NSValue valueWithRect: overshotFrame],
                                  NSViewAnimationEffectKey: NSViewAnimationFadeInEffect};

    NSArray *animations = @[windowResize];
    NSViewAnimation *animation = [[NSViewAnimation alloc] initWithViewAnimations: animations];

    [animation setAnimationBlockingMode: NSAnimationBlocking];
    [animation setAnimationCurve: NSAnimationEaseIn];
    [animation setDuration: 0.2];
    [animation startAnimation];

    zoomWindow.animationTimeMultiplier = 0.5;
    [zoomWindow setFrame: frame display: YES animate: YES];

    [self setAlphaValue: 1];

    if (makeKey) {
        [self makeKeyAndOrderFront: self];
    } else {
        [self orderFront: self];
    }
    [zoomWindow close];
}

これはNSWindowカテゴリに実装されています。だからあなたは呼び出すことができます：

- (void)zoomInWithOvershot: (NSRect)overshotFrame withFade: (BOOL)fade makeKey: (BOOL)makeKey

任意のNSWindowで。

両方のアニメーション（フェードとサイズ）を同時に実行することはできませんでしたが、その効果はNSPopoverの場合と非常に似ています。たぶん、他の誰かがアニメーションの問題を修正することができます。

言うまでもなく、このコードはNSPopoverがない10.6でも機能します（それが私が最初に書いた理由です）。