mac开发之监听拦截键盘输入keycode

发表于 | 分类于 | 人次
| 字数统计 715

最近在自己写一个mac上图片预览的功能，仿系统的预览，想要在预览的时候，加入快捷键，实现放大、缩小、前一张、后一张等功能。

因为总感觉，弄个鼠标啪啪的点，很土。。。

PS:不上源码你说个JJ 。。。 源码在这里

查阅相关资料，其实并不难实现，只需要在预览的window里面实现键盘的监听就好，具体如下：

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//overriding  -[NSWindow keyDown:].
- (void)keyDown:(NSEvent *)theEvent{
    unsigned short  keycode = [theEvent keyCode];
    //是否同时按下CMD
    int flags = 0;
    BOOL cmdkeydown = ([[NSApp currentEvent] modifierFlags] & NSCommandKeyMask) == NSCommandKeyMask;
    if (cmdkeydown) {
        flags = flags | NSCommandKeyMask;
    }
    if (keycode == 49) { //space
            //空格键去干点啥。。
    }
}

可以拿到键盘对应的 key code，这个值其实是固定的，比如上面的空格键键值是49。

那么问题来了，总不能每个键去输入一下，打个断点看看值是多少吧，太土了。。。

其实SDK里面是有相应的 enum的，位置在这里：

Virtual key codes 在 Carbon framework 的这个文件里面

果断add Carbon.framework,但是并不能import <HIToolbox/Events.h>。很奇怪，没明白。。。

好在这样就可以：#import <Carbon/Carbon.h>

你就可以这样搞了：

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if (keycode == kVK_Space) { //space
      //空格键去干点啥。。
 }

可以在这里找到HIToolbox/Events.h文件：

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/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/Headers/Events.h

然后你就能看见下面的这些ENUM了：

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/*
	 *  Summary:
	 *    Virtual keycodes
	 *  
	 *  Discussion:
	 *    These constants are the virtual keycodes defined originally in
	 *    Inside Mac Volume V, pg. V-191. They identify physical keys on a
	 *    keyboard. Those constants with "ANSI" in the name are labeled
	 *    according to the key position on an ANSI-standard US keyboard.
	 *    For example, kVK_ANSI_A indicates the virtual keycode for the key
	 *    with the letter 'A' in the US keyboard layout. Other keyboard
	 *    layouts may have the 'A' key label on a different physical key;
	 *    in this case, pressing 'A' will generate a different virtual
	 *    keycode.
	 */
	enum {
	  kVK_ANSI_A                    = 0x00,
	  kVK_ANSI_S                    = 0x01,
	  kVK_ANSI_D                    = 0x02,
	  kVK_ANSI_F                    = 0x03,
	  kVK_ANSI_H                    = 0x04,
	  kVK_ANSI_G                    = 0x05,
	  kVK_ANSI_Z                    = 0x06,
	  kVK_ANSI_X                    = 0x07,
	  kVK_ANSI_C                    = 0x08,
	  kVK_ANSI_V                    = 0x09,
	  kVK_ANSI_B                    = 0x0B,
	  kVK_ANSI_Q                    = 0x0C,
	  kVK_ANSI_W                    = 0x0D,
	  kVK_ANSI_E                    = 0x0E,
	  kVK_ANSI_R                    = 0x0F,
	  kVK_ANSI_Y                    = 0x10,
	  kVK_ANSI_T                    = 0x11,
	  kVK_ANSI_1                    = 0x12,
	  kVK_ANSI_2                    = 0x13,
	  kVK_ANSI_3                    = 0x14,
	  kVK_ANSI_4                    = 0x15,
	  kVK_ANSI_6                    = 0x16,
	  kVK_ANSI_5                    = 0x17,
	  kVK_ANSI_Equal                = 0x18,
	  kVK_ANSI_9                    = 0x19,
	  kVK_ANSI_7                    = 0x1A,
	  kVK_ANSI_Minus                = 0x1B,
	  kVK_ANSI_8                    = 0x1C,
	  kVK_ANSI_0                    = 0x1D,
	  kVK_ANSI_RightBracket         = 0x1E,
	  kVK_ANSI_O                    = 0x1F,
	  kVK_ANSI_U                    = 0x20,
	  kVK_ANSI_LeftBracket          = 0x21,
	  kVK_ANSI_I                    = 0x22,
	  kVK_ANSI_P                    = 0x23,
	  kVK_ANSI_L                    = 0x25,
	  kVK_ANSI_J                    = 0x26,
	  kVK_ANSI_Quote                = 0x27,
	  kVK_ANSI_K                    = 0x28,
	  kVK_ANSI_Semicolon            = 0x29,
	  kVK_ANSI_Backslash            = 0x2A,
	  kVK_ANSI_Comma                = 0x2B,
	  kVK_ANSI_Slash                = 0x2C,
	  kVK_ANSI_N                    = 0x2D,
	  kVK_ANSI_M                    = 0x2E,
	  kVK_ANSI_Period               = 0x2F,
	  kVK_ANSI_Grave                = 0x32,
	  kVK_ANSI_KeypadDecimal        = 0x41,
	  kVK_ANSI_KeypadMultiply       = 0x43,
	  kVK_ANSI_KeypadPlus           = 0x45,
	  kVK_ANSI_KeypadClear          = 0x47,
	  kVK_ANSI_KeypadDivide         = 0x4B,
	  kVK_ANSI_KeypadEnter          = 0x4C,
	  kVK_ANSI_KeypadMinus          = 0x4E,
	  kVK_ANSI_KeypadEquals         = 0x51,
	  kVK_ANSI_Keypad0              = 0x52,
	  kVK_ANSI_Keypad1              = 0x53,
	  kVK_ANSI_Keypad2              = 0x54,
	  kVK_ANSI_Keypad3              = 0x55,
	  kVK_ANSI_Keypad4              = 0x56,
	  kVK_ANSI_Keypad5              = 0x57,
	  kVK_ANSI_Keypad6              = 0x58,
	  kVK_ANSI_Keypad7              = 0x59,
	  kVK_ANSI_Keypad8              = 0x5B,
	  kVK_ANSI_Keypad9              = 0x5C
	};
	/* keycodes for keys that are independent of keyboard layout*/
	enum {
	  kVK_Return                    = 0x24,
	  kVK_Tab                       = 0x30,
	  kVK_Space                     = 0x31,
	  kVK_Delete                    = 0x33,
	  kVK_Escape                    = 0x35,
	  kVK_Command                   = 0x37,
	  kVK_Shift                     = 0x38,
	  kVK_CapsLock                  = 0x39,
	  kVK_Option                    = 0x3A,
	  kVK_Control                   = 0x3B,
	  kVK_RightShift                = 0x3C,
	  kVK_RightOption               = 0x3D,
	  kVK_RightControl              = 0x3E,
	  kVK_Function                  = 0x3F,
	  kVK_F17                       = 0x40,
	  kVK_VolumeUp                  = 0x48,
	  kVK_VolumeDown                = 0x49,
	  kVK_Mute                      = 0x4A,
	  kVK_F18                       = 0x4F,
	  kVK_F19                       = 0x50,
	  kVK_F20                       = 0x5A,
	  kVK_F5                        = 0x60,
	  kVK_F6                        = 0x61,
	  kVK_F7                        = 0x62,
	  kVK_F3                        = 0x63,
	  kVK_F8                        = 0x64,
	  kVK_F9                        = 0x65,
	  kVK_F11                       = 0x67,
	  kVK_F13                       = 0x69,
	  kVK_F16                       = 0x6A,
	  kVK_F14                       = 0x6B,
	  kVK_F10                       = 0x6D,
	  kVK_F12                       = 0x6F,
	  kVK_F15                       = 0x71,
	  kVK_Help                      = 0x72,
	  kVK_Home                      = 0x73,
	  kVK_PageUp                    = 0x74,
	  kVK_ForwardDelete             = 0x75,
	  kVK_F4                        = 0x76,
	  kVK_End                       = 0x77,
	  kVK_F2                        = 0x78,
	  kVK_PageDown                  = 0x79,
	  kVK_F1                        = 0x7A,
	  kVK_LeftArrow                 = 0x7B,
	  kVK_RightArrow                = 0x7C,
	  kVK_DownArrow                 = 0x7D,
	  kVK_UpArrow                   = 0x7E
	};
	/* ISO keyboards only*/
	enum {
	  kVK_ISO_Section               = 0x0A
	};
	/* JIS keyboards only*/
	enum {
	  kVK_JIS_Yen                   = 0x5D,
	  kVK_JIS_Underscore            = 0x5E,
	  kVK_JIS_KeypadComma           = 0x5F,
	  kVK_JIS_Eisu                  = 0x66,
	  kVK_JIS_Kana                  = 0x68
	};
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