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exp/draw/x11: implement the mapping from keycodes to keysyms.
R=rsc CC=golang-dev, rog https://golang.org/cl/1739042
This commit is contained in:
Nigel Tao
parent
807605d0fc
commit
715425bf6f
@ -29,6 +29,11 @@ const (
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windowWidth = 800
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)
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const (
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keymapLo = 8
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keymapHi = 255
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)
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type conn struct {
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// TODO(nigeltao): Figure out which goroutine should be responsible for closing c,
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// or if there is a race condition if one goroutine calls c.Close whilst another one
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@ -136,6 +141,13 @@ func (c *conn) QuitChan() <-chan bool { return c.quit }
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// pumper runs in its own goroutine, reading X events and demuxing them over the kbd / mouse / resize / quit chans.
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func (c *conn) pumper() {
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var (
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keymap [256][]int
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keysymsPerKeycode int
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)
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defer close(c.flush)
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// TODO(nigeltao): Is this the right place for defer c.c.Close()?
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// TODO(nigeltao): Should we explicitly defer close our kbd/mouse/resize/quit chans?
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for {
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// X events are always 32 bytes long.
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_, err := io.ReadFull(c.r, c.buf[0:32])
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@ -144,15 +156,49 @@ func (c *conn) pumper() {
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// TODO(nigeltao): should we do c.quit<-true? Should c.quit be a buffered channel?
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// Or is c.quit only for non-exceptional closing (e.g. when the window manager destroys
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// our window), and not for e.g. an I/O error?
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break
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os.Stderr.Write([]byte(err.String()))
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return
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}
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switch c.buf[0] {
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case 0x01: // Reply from a request (e.g. GetKeyboardMapping).
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cookie := int(c.buf[3])<<8 | int(c.buf[2])
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if cookie != 1 {
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// We issued only one request (GetKeyboardMapping) with a cookie of 1,
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// so we shouldn't get any other reply from the X server.
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os.Stderr.Write([]byte("exp/draw/x11: unexpected cookie\n"))
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return
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}
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keysymsPerKeycode = int(c.buf[1])
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b := make([]int, 256*keysymsPerKeycode)
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for i := range keymap {
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keymap[i] = b[i*keysymsPerKeycode : (i+1)*keysymsPerKeycode]
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}
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for i := keymapLo; i <= keymapHi; i++ {
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m := keymap[i]
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for j := range m {
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u, err := readU32LE(c.r, c.buf[0:4])
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if err != nil {
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os.Stderr.Write([]byte(err.String()))
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return
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}
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m[j] = int(u)
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}
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}
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case 0x02, 0x03: // Key press, key release.
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// BUG(nigeltao): Keycode to keysym mapping is not implemented.
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// The keycode is in c.buf[1], but as keymaps aren't implemented yet, we'll use the
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// space character as a placeholder.
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keysym := int(' ')
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// X Keyboard Encoding is documented at http://tronche.com/gui/x/xlib/input/keyboard-encoding.html
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// TODO(nigeltao): Do we need to implement the "MODE SWITCH / group modifier" feature
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// or is that some no-longer-used X construct?
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if keysymsPerKeycode < 2 {
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// Either we haven't yet received the GetKeyboardMapping reply or
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// the X server has sent one that's too short.
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continue
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}
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keycode := int(c.buf[1])
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shift := int(c.buf[28]) & 0x01
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keysym := keymap[keycode][shift]
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if keysym == 0 {
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keysym = keymap[keycode][0]
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}
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// TODO(nigeltao): Should we send KeyboardChan ints for Shift/Ctrl/Alt? Should Shift-A send
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// the same int down the channel as the sent on just the A key?
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// TODO(nigeltao): How should IME events (e.g. key presses that should generate CJK text) work? Or
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@ -194,9 +240,6 @@ func (c *conn) pumper() {
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// What about EnterNotify (0x07) and LeaveNotify (0x08)?
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}
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}
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close(c.flush)
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// TODO(nigeltao): Is this the right place for c.c.Close()?
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// TODO(nigeltao): Should we explicitly close our kbd/mouse/resize/quit chans?
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}
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// connect connects to the X server given by the full X11 display name (e.g.
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@ -537,29 +580,33 @@ func NewWindowDisplay(display string) (draw.Context, os.Error) {
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}
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// Now that we're connected, show a window, via three X protocol messages.
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// First, create a graphics context (GC).
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setU32LE(c.buf[0:4], 0x00060037) // 0x37 is the CreateGC opcode, and the message is 6 x 4 bytes long.
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setU32LE(c.buf[4:8], uint32(c.gc))
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setU32LE(c.buf[8:12], uint32(c.root))
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setU32LE(c.buf[12:16], 0x00010004) // Bit 2 is XCB_GC_FOREGROUND, bit 16 is XCB_GC_GRAPHICS_EXPOSURES.
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setU32LE(c.buf[16:20], 0x00000000) // The Foreground is black.
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setU32LE(c.buf[20:24], 0x00000000) // GraphicsExposures' value is unused.
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// Second, create the window.
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setU32LE(c.buf[24:28], 0x000a0001) // 0x01 is the CreateWindow opcode, and the message is 10 x 4 bytes long.
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setU32LE(c.buf[28:32], uint32(c.window))
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setU32LE(c.buf[32:36], uint32(c.root))
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setU32LE(c.buf[36:40], 0x00000000) // Initial (x, y) is (0, 0).
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setU32LE(c.buf[40:44], windowHeight<<16|windowWidth)
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setU32LE(c.buf[44:48], 0x00010000) // Border width is 0, XCB_WINDOW_CLASS_INPUT_OUTPUT is 1.
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setU32LE(c.buf[48:52], uint32(c.visual))
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setU32LE(c.buf[52:56], 0x00000802) // Bit 1 is XCB_CW_BACK_PIXEL, bit 11 is XCB_CW_EVENT_MASK.
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setU32LE(c.buf[56:60], 0x00000000) // The Back-Pixel is black.
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setU32LE(c.buf[60:64], 0x0000804f) // Key/button press and release, pointer motion, and expose event masks.
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// Third, map the window.
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setU32LE(c.buf[64:68], 0x00020008) // 0x08 is the MapWindow opcode, and the message is 2 x 4 bytes long.
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setU32LE(c.buf[68:72], uint32(c.window))
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// First, issue a GetKeyboardMapping request. This is the first request, and
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// will be associated with a cookie of 1.
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setU32LE(c.buf[0:4], 0x00020065) // 0x65 is the GetKeyboardMapping opcode, and the message is 2 x 4 bytes long.
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setU32LE(c.buf[4:8], uint32((keymapHi-keymapLo+1)<<8|keymapLo))
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// Second, create a graphics context (GC).
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setU32LE(c.buf[8:12], 0x00060037) // 0x37 is the CreateGC opcode, and the message is 6 x 4 bytes long.
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setU32LE(c.buf[12:16], uint32(c.gc))
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setU32LE(c.buf[16:20], uint32(c.root))
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setU32LE(c.buf[20:24], 0x00010004) // Bit 2 is XCB_GC_FOREGROUND, bit 16 is XCB_GC_GRAPHICS_EXPOSURES.
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setU32LE(c.buf[24:28], 0x00000000) // The Foreground is black.
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setU32LE(c.buf[28:32], 0x00000000) // GraphicsExposures' value is unused.
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// Third, create the window.
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setU32LE(c.buf[32:36], 0x000a0001) // 0x01 is the CreateWindow opcode, and the message is 10 x 4 bytes long.
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setU32LE(c.buf[36:40], uint32(c.window))
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setU32LE(c.buf[40:44], uint32(c.root))
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setU32LE(c.buf[44:48], 0x00000000) // Initial (x, y) is (0, 0).
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setU32LE(c.buf[48:52], windowHeight<<16|windowWidth)
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setU32LE(c.buf[52:56], 0x00010000) // Border width is 0, XCB_WINDOW_CLASS_INPUT_OUTPUT is 1.
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setU32LE(c.buf[56:60], uint32(c.visual))
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setU32LE(c.buf[60:64], 0x00000802) // Bit 1 is XCB_CW_BACK_PIXEL, bit 11 is XCB_CW_EVENT_MASK.
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setU32LE(c.buf[64:68], 0x00000000) // The Back-Pixel is black.
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setU32LE(c.buf[68:72], 0x0000804f) // Key/button press and release, pointer motion, and expose event masks.
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// Fourth, map the window.
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setU32LE(c.buf[72:76], 0x00020008) // 0x08 is the MapWindow opcode, and the message is 2 x 4 bytes long.
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setU32LE(c.buf[76:80], uint32(c.window))
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// Write the bytes.
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_, err = c.w.Write(c.buf[0:72])
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_, err = c.w.Write(c.buf[0:80])
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if err != nil {
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return nil, err
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}
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