153 lines
4.4 KiB
Go
153 lines
4.4 KiB
Go
// +build !darwin
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// Mac OS X uses its own set of position-independent key codes
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// 29 march 2014
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package ui
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import (
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"image"
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)
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/*
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Windows and GTK+ have a limit of 2 and 3 clicks, respectively, natively supported. Fortunately, we can simulate the double/triple-click behavior to build higher-order clicks. We can use the same algorithm Windows uses on both:
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http://blogs.msdn.com/b/oldnewthing/archive/2004/10/18/243925.aspx
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For GTK+, we pull the double-click time and double-click distance, which work the same as the equivalents on Windows (so the distance is in all directions), from the GtkSettings system.
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On GTK+ this will also allow us to discard the GDK_BUTTON_2PRESS and GDK_BUTTON_3PRESS events, so the button press stream will be just like on other platforms.
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Thanks to mclasen, garnacho_, halfline, and tristan in irc.gimp.net/#gtk+.
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*/
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// the zero value is a reset clickCounter ready for use
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// it doesn't matter that all the non-count fields are zero: the first click will fail the curButton test straightaway, so it'll return 1 and set the rest of the structure accordingly
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type clickCounter struct {
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curButton uint
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rect image.Rectangle
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prevTime uintptr
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count uint
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}
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// x, y, xdist, ydist, and c.rect must have the same units
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// so must time, maxTime, and c.prevTime
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func (c *clickCounter) click(button uint, x int, y int, time uintptr, maxTime uintptr, xdist int, ydist int) uint {
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if button != c.curButton { // different button; start over
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c.count = 0
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}
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if !image.Pt(x, y).In(c.rect) { // not in the allowed region for a double-click; don't count
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c.count = 0
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}
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if (time - c.prevTime) > maxTime { // too slow; don't count
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// note the above expression; time > (c.prevTime + maxTime) can overflow!
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c.count = 0
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}
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c.count++ // if either of the above ifs happened, this will make the click count 1; otherwise it will make the click count 2, 3, 4, 5, ...
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// now we need to update the internal structures for the next test
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c.curButton = button
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c.prevTime = time
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c.rect = image.Rect(x-xdist, y-ydist,
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x+xdist, y+ydist)
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return c.count
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}
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// call this when losing focus, etc.
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func (c *clickCounter) reset() {
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c.count = 0
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}
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/*
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For position independence across international keyboard layouts, typewriter keys are read using scancodes (which are always set 1).
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Windows provides the scancodes directly in the LPARAM.
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GTK+ provides the scancodes directly from the underlying window system via GdkEventKey.hardware_keycode.
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On X11, this is scancode + 8 (because X11 keyboard codes have a range of [8,255]).
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Wayland is guaranteed to give the same result (thanks ebassi in irc.gimp.net/#gtk+).
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On Linux, where evdev is used instead of polling scancodes directly from the keyboard, evdev's typewriter section key code constants are the same as scancodes anyway, so the rules above apply.
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Typewriter section scancodes are the same across international keyboards with some exceptions that have been accounted for (see KeyEvent's documentation); see http://www.quadibloc.com/comp/scan.htm for details.
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Non-typewriter keys can be handled safely using constants provided by the respective backend API.
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Because GTK+ keysyms may or may not obey Num Lock, we also handle the 0-9 and . keys on the numeric keypad with scancodes (they match too).
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*/
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// use uintptr to be safe; the size of the scancode/hardware key code field on each platform is different
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var scancodeKeys = map[uintptr]byte{
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0x02: '1',
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0x03: '2',
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0x04: '3',
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0x05: '4',
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0x06: '5',
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0x07: '6',
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0x08: '7',
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0x09: '8',
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0x0A: '9',
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0x0B: '0',
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0x0C: '-',
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0x0D: '=',
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0x0E: '\b',
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0x0F: '\t',
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0x10: 'q',
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0x11: 'w',
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0x12: 'e',
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0x13: 'r',
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0x14: 't',
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0x15: 'y',
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0x16: 'u',
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0x17: 'i',
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0x18: 'o',
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0x19: 'p',
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0x1A: '[',
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0x1B: ']',
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0x1C: '\n',
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0x1E: 'a',
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0x1F: 's',
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0x20: 'd',
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0x21: 'f',
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0x22: 'g',
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0x23: 'h',
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0x24: 'j',
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0x25: 'k',
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0x26: 'l',
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0x27: ';',
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0x28: '\'',
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0x29: '`',
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0x2B: '\\',
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0x2C: 'z',
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0x2D: 'x',
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0x2E: 'c',
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0x2F: 'v',
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0x30: 'b',
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0x31: 'n',
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0x32: 'm',
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0x33: ',',
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0x34: '.',
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0x35: '/',
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0x39: ' ',
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}
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var scancodeExtKeys = map[uintptr]ExtKey{
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0x47: N7,
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0x48: N8,
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0x49: N9,
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0x4B: N4,
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0x4C: N5,
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0x4D: N6,
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0x4F: N1,
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0x50: N2,
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0x51: N3,
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0x52: N0,
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0x53: NDot,
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}
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func fromScancode(scancode uintptr) (ke KeyEvent, ok bool) {
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if key, ok := scancodeKeys[scancode]; ok {
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ke.Key = key
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return ke, true
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}
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if extkey, ok := scancodeExtKeys[scancode]; ok {
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ke.ExtKey = extkey
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return ke, true
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}
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return ke, false
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}
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