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我遵循了一些使NSButton子类工作的示例NSColorWell(因为我们的NSButton子类已经为我们提供了我们需要的外观行为),但是我注意到在使用按钮调用面板并更改颜色之后,它也改变了颜色我们文档中的选定文本。如果我改为NSColorWell使用我们的外观自定义进行子类化,它不会有这个问题吗?

但是,我仍然希望有一种解决方法可以避免这种情况,并且仍然可以让我们使用我们的按钮子类。我已经看到讨论线程建议让按钮本身成为第一响应者,但是由于按钮位于单独的调色板中,因此我无法使其正常工作。此外,我不希望更改响应者链或让调色板成为关键窗口。覆盖 setColor:的类别NSColorPanel会有多邪恶,使其发布预期的通知但不触及第一响应者?

(注意,我目前正在使用BFColorPickerPopoverDrummerB https://github.com/DrummerB/BFColorPickerPopover ,而不是简单地打开颜色面板。但是我不认为这很复杂。我有同样的NSColorPanel/第一个集成之前的响应者问题)。

被要求发布源代码,所以这是我的 NSButton 子类中的相关位(注意,使用上面提到的选择器弹出框而不是NSColorPanel直接使用):

。H:

@interface ...
@property (nonatomic, strong) NSColor *color;
@property (nonatomic, assign) BOOL active;
@property (nonatomic, strong) NSColor *buttonColor;
@property (nonatomic, weak) BFColorPickerPopover *popover;
- (void)activate:(BOOL)exclusive; // param ignored, always exclusive
- (void)activate;
- (void)deactivate;
- (void)takeColorFrom:(id)sender;
@end

米:

@implementation ...
@dynamic color;
- (NSColor *)color
{
    return self.buttonColor;
}
- (void)setColor:(NSColor *)newColor
{
    self.buttonColor = newColor;
    [self generateSwatch];
    self.needsDisplay = YES;
    self.popover.color = newColor;
}
- (void)activate:(BOOL)exclusive
{
    [self activate]; // always exclusive
}
- (void)activate
{
    self.popover = [BFColorPickerPopover sharedPopover];
    self.popover.color = self.buttonColor;
    [self.popover showRelativeToRect:self.frame ofView:self.superview
                             preferredEdge:self.preferredEdgeForPopover];
    [[NSNotificationCenter defaultCenter] addObserver:self
                        selector:@selector(popoverDidClose:)
                            name:NSPopoverDidCloseNotification
                          object:self.popover];
    [[NSNotificationCenter defaultCenter] addObserver:self
                        selector:@selector(colorDidChange:)
                            name:NSColorPanelColorDidChangeNotification
                          object:self.popover.colorPanel];
    activeButton = self;
    self.active = YES;
}
- (void)deactivate
{
    if (self.popover)
    {
        [self.popover close];
        self.popover = nil;
    }
    [[NSNotificationCenter defaultCenter] removeObserver:self
           name:NSPopoverDidCloseNotification object:self.popover];
    [[NSNotificationCenter defaultCenter] removeObserver:self
                      name:NSColorPanelColorDidChangeNotification
                   object:self.popover.colorPanel];
    if (activeButton == self) activeButton = nil;
    self.active = NO;
}
- (void)popoverDidClose:(NSNotification *)notification
{
    self.popover = nil; // don't let deactivate ask it to close again
    [self deactivate];
}
- (void)colorDidChange:(NSNotification *)notification
{
    self.buttonColor = self.popover.colorPanel.color;
    [self generateSwatch];
    self.needsDisplay = YES;
    [self sendAction:self.action to:self.target];
}
- (void)mouseDown:(NSEvent *)theEvent
{
    if (self.isEnabled && !self.active)
        [self activate];
    else if (self.active)
        [self deactivate];
}
- (void)takeColorFrom:(id)sender
{
    if ([sender respondsToSelector:@selector(color)])
        self.color = [sender color];
}
@end

附录:

我尝试使用普通NSColorWell代替我的 NSButton 子类,但同样的问题。changeColor:除了调用操作方法外,面板中选择的颜色还会调用第一响应者。所以忘记NSButton了我的问题中的所有内容,一般来说,一个人如何使用 a NSColorWell,其颜色也不能被推到第一响应者身上?必须求助于自定义预期的第一响应者以选择性地忽略changeColor:,还是让NSColorWell第一响应者真的是要做的事情,或者别的什么?

4

1 回答 1

2

是的,一个更好的网络搜索词(NSColorWell “第一响应者”),我看到其他人NSColorWell长期以来一直在努力解决同样的问题。许多旧的邮件列表线程已经涵盖了这一点,并看到了 3 个解决方案:

  1. http://www.cocoabuilder.com/archive/cocoa/82832-nscolorwell-changecolor-and-first-responder.html Douglas Davidson 建议对潜在的第一响应者进行子类化,以便他们忽略changeColor:(可能我会做什么)

  2. http://www.cocoabuilder.com/archive/cocoa/3263-your-nscolorwell-got-in-my-nstext.html Guy English 建议暂时将颜色设为第一响应者(我尝试过但因颜色而出现问题在一个我不想成为关键的小组中幸福)

  3. http://www.cocoabuilder.com/archive/cocoa/180323-detecting-currently-active-nscolorwell.html马丁建议changeColor:首先通过冒充NSColorPanel和覆盖私有方法来阻止调用(最接近我想要的,但应用商店拒绝的风险比我想象的要大)

更新:我尝试了#1,但事实证明我无法覆盖第一响应者(WebView/ WebHTMLViewgrrr)。与#3一起,我将以下内容放在一个NSColorPanel类别中,设置我的颜色按钮panel.avoidsChangingFirstResponder=YES,它似乎工作:

static char changeColorPatchAssociatedObjectKey; // address of this is used as a unique runtime value

- (BOOL)avoidsChangingFirstResponder
{
    NSNumber *changeColorPatchFlag = (NSNumber *)objc_getAssociatedObject(self, &changeColorPatchAssociatedObjectKey);
    return changeColorPatchFlag && changeColorPatchFlag.boolValue;
}

- (void)setAvoidsChangingFirstResponder:(BOOL)enablePatch
{
    NSNumber *changeColorPatchFlag = (NSNumber *)objc_getAssociatedObject(self, &changeColorPatchAssociatedObjectKey);
    if ((!changeColorPatchFlag && enablePatch) || (changeColorPatchFlag && changeColorPatchFlag.boolValue != enablePatch))
        objc_setAssociatedObject(self, &changeColorPatchAssociatedObjectKey, @( enablePatch ), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

+ (void)load
{
    if (self == [NSColorPanel class])
    {
        // patch implementation of _forceSendAction:notification:firstResponder: (use swizzle technique from MAKVONotificationCenter.m)
        // for one that calls original but with the last BOOL parameter conditionally changed to NO
        SEL methodSel = NSSelectorFromString(@"_forceSendAction:notification:firstResponder:");
        Method method = class_getInstanceMethod(self, methodSel);
        IMP origImpl = method_getImplementation(method);
        IMP newImpl = imp_implementationWithBlock(^(void *obj, SEL s, BOOL isAct, BOOL isNotif, BOOL isFirstResp) {
            NSNumber *changeColorPatchFlag = (NSNumber *)objc_getAssociatedObject((__bridge id)(obj), &changeColorPatchAssociatedObjectKey);
            if (changeColorPatchFlag && changeColorPatchFlag.boolValue)
                isFirstResp = NO;
            ((void (*)(void *, SEL, BOOL, BOOL, BOOL))origImpl)(obj, s, isAct, isNotif, isFirstResp);
        });
        class_replaceMethod(self, methodSel, newImpl, method_getTypeEncoding(method));
    }
}

我希望其他人觉得这很有用。

于 2013-01-17T18:15:16.207 回答