如何允许箭头键操作图形NSDatePicker?

时间:2013-08-31 16:48:31

标签: datepicker nsresponder nsdatepicker

这看起来很简单,但很重要。

将NSDatePicker(样式:图形)放入窗口,构建&运行,然后尝试使用箭头键移动。唯一的反应就是来自电脑的“叮当”。

我在一个简单的自定义NSDatePicker子类中重写了-keydown并打印了theEvent,注意到它们有相应的123到126的keyCodes。

然后,我偶然发现在按下每个箭头按钮后重置日期选择器的日期-keydown,如下所示:

- (void)keyDown:(NSEvent *)theEvent
    switch ([[theEvent valueForKey:@"keyCode"] integerValue]) {
        case 126:
            // Take away one week from the date
            self.dateValue = [NSDate dateWithTimeInterval:-604800 sinceDate:self.dateValue];
            break;
        .... similar for 125 - 123 ...
    }
}

实现此方法的副作用是取消“tab”键以单步执行对象。

这似乎是一个很大的解决方法。是否还有其他方式已包含在日期选择器中?

1 个答案:

答案 0 :(得分:0)

我意识到这个问题真的很老了,但我只是在努力解决这个问题,所以...... 以下方法适合我。

- (void)keyDown:(NSEvent *)theEvent
{
    NSString* replacementKey = nil;

    switch ([theEvent keyCode])
    {
        case 123:    // Left arrow
            replacementKey = @"-";
            break;
        case 124:    // Right arrow
            replacementKey = @"+";
            break;
        case 125:    // Down arrow
            replacementKey = @"]";
            break;
        case 126:    // Up arrow
            replacementKey = @"[";
            break;
        case 53: // esc
        case 36: // return  -- don't assign replacement key and these will dismiss date picker
            break;

        default:
            replacementKey = [theEvent charactersIgnoringModifiers];
            break;
    }

    if (replacementKey) // 'letter' based shortcut keys
    {
        [self.textFieldCell dateShortcut:replacementKey];
        [self updateGraphicalCalendar];
    }
    else
    {       
        [self.textFieldCell hidegraphicCalendar];
    }
}

请注意,这是与自定义NSTextFieldCell关联的图形日期选择器。自定义textfieldcell通过修改所选日期来处理快捷键(" replacementKey"),如:

if (NSOrderedSame == [shortcut caseInsensitiveCompare:@"+"] || NSOrderedSame == [shortcut caseInsensitiveCompare:@"="]) // '=' is unshifted '+'
{
    emptyComponents.day = 1;
    currentDateValue = [calendar dateByAddingComponents:emptyComponents toDate:currentDateValue options:0];
}

else if (NSOrderedSame == [shortcut caseInsensitiveCompare:@"-"])
{
    emptyComponents.day = -1;
    currentDateValue = [calendar dateByAddingComponents:emptyComponents toDate:currentDateValue options:0];
}

else if (NSOrderedSame == [shortcut caseInsensitiveCompare:@"["]) // same day in previous week
{
    emptyComponents.day = -7;
    currentDateValue = [calendar dateByAddingComponents:emptyComponents toDate:currentDateValue options:0];
}

else if (NSOrderedSame == [shortcut caseInsensitiveCompare:@"]"]) // same day in next week
{
    emptyComponents.day = 7;
    currentDateValue = [calendar dateByAddingComponents:emptyComponents toDate:currentDateValue options:0];
}