428 lines
12 KiB
V
428 lines
12 KiB
V
// Currently there is only X11 Selections support and no way to handle Wayland
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// but since Wayland isn't extremely adopted, we are covering almost all Linux distros.
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module clipboard
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import (
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time
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sync
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math
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)
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#flag -lX11
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#include <X11/Xlib.h>
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// X11
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struct C.Display
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struct C.Atom
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struct C.Window
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fn C.XInitThreads() int
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fn C.XCloseDisplay(d &Display)
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fn C.XFlush(d &Display)
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fn C.XDestroyWindow(d &Display, w Window)
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fn C.XNextEvent(d Display, e &XEvent)
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fn C.XSetSelectionOwner(d &Display, a Atom, w Window, time int)
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fn C.XGetSelectionOwner(d &Display, a Atom) Window
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fn C.XChangeProperty(d &Display, requestor Window, property Atom, typ Atom, format int, mode int, data voidptr, nelements int) int
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fn C.XSendEvent(d &Display, requestor Window, propogate int, mask i64, event &XEvent)
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fn C.XInternAtom(d &Display, typ byteptr, only_if_exists int) Atom
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fn C.XCreateSimpleWindow(d &Display, root Window, x int, y int, width u32, height u32, border_width u32, border u64, background u64) Window
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fn C.XOpenDisplay(name byteptr) &Display
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fn C.XConvertSelection(d &Display, selection Atom, target Atom, property Atom, requestor Window, time int) int
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fn C.XSync(d &Display, discard int) int
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fn C.XGetWindowProperty(d &Display, w Window, property Atom, offset i64, length i64, delete int, req_type Atom, actual_type_return &Atom, actual_format_return &int, nitems &i64, bytes_after_return &i64, prop_return &byteptr) int
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fn C.XDeleteProperty(d &Display, w Window, property Atom) int
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fn C.DefaultScreen() int
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fn C.RootWindow() voidptr
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fn C.BlackPixel() voidptr
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fn C.WhitePixel() voidptr
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fn C.XFree()
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struct C.XSelectionRequestEvent{
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mut:
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selection Atom
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display &Display /* Display the event was read from */
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owner Window
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requestor Window
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target Atom
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property Atom
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time int
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}
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struct C.XSelectionEvent{
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mut:
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@type int
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selection Atom
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display &Display /* Display the event was read from */
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requestor Window
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target Atom
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property Atom
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time int
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}
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struct C.XSelectionClearEvent{
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mut:
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window Window
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selection Atom
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}
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struct C.XDestroyWindowEvent {
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mut:
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window Window
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}
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struct C.XEvent{
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mut:
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@type int
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xselectionrequest XSelectionRequestEvent
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xselection XSelectionEvent
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xselectionclear XSelectionClearEvent
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xdestroywindow XDestroyWindowEvent
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}
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const (
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atom_names = ["TARGETS", "CLIPBOARD", "PRIMARY", "SECONDARY", "TEXT", "UTF8_STRING", "text/plain", "text/html"]
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)
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//UNSUPPORTED TYPES: MULTIPLE, INCR, TIMESTAMP, image/bmp, image/jpeg, image/tiff, image/png
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// all the atom types we need
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// currently we only support text
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// in the future, maybe we can extend this
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// to support other mime types
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enum atom_type {
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xa_atom = 0, //value 4
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xa_string = 1, //value 31
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targets = 2,
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clipboard = 3,
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primary = 4,
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secondary = 5,
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text = 6,
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utf8_string = 7
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text_plain = 8,
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text_html = 9
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}
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pub struct Clipboard {
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display &Display
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mut:
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selection Atom //the selection atom
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window Window
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atoms []Atom
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mutex sync.Mutex
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text string // text data sent or received
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got_text bool // used to confirm that we have got the text
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is_owner bool // to save selection owner state
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}
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struct Property{
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actual_type Atom
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actual_format int
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nitems int
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data byteptr
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}
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fn new_clipboard() &Clipboard {
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return new_x11_clipboard(.clipboard)
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}
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// Initialize a new clipboard of the given selection type.
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// We can initialize multiple clipboard instances and use them separately
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fn new_x11_clipboard(selection atom_type) &Clipboard {
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if !(selection in [.clipboard, .primary, .secondary]) {
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panic("Wrong atom_type. Must be one of .primary, .secondary or .clipboard.")
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}
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//init x11 thread support
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status := XInitThreads()
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if status == 0 {
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println("WARN: this system does not support threads; clipboard will cause the program to lock.")
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}
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display := new_display()
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if display == C.NULL {
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println("ERROR: No X Server running. Clipboard cannot be used.")
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return &Clipboard{ display: 0 }
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}
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mut cb := &Clipboard{
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display: display
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window: create_xwindow(display)
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mutex: sync.new_mutex()
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}
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cb.intern_atoms()
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cb.selection = cb.get_atom(selection)
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// start the listener on another thread or
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// we will be locked and will have to hard exit
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go cb.start_listener()
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return cb
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}
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fn (cb &Clipboard) check_availability() bool {
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return cb.display != C.NULL
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}
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fn (cb mut Clipboard) free() {
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XDestroyWindow(cb.display, cb.window)
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cb.window = Window(C.None)
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//FIX ME: program hangs when closing display
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//XCloseDisplay(cb.display)
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}
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fn (cb mut Clipboard) clear(){
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cb.mutex.lock()
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XSetSelectionOwner(cb.display, cb.selection, Window(C.None), C.CurrentTime)
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XFlush(cb.display)
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cb.is_owner = false
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cb.text = ""
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cb.mutex.unlock()
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}
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fn (cb &Clipboard) has_ownership() bool {
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return cb.is_owner
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}
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fn (cb &Clipboard) take_ownership(){
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XSetSelectionOwner(cb.display, cb.selection, cb.window, C.CurrentTime)
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XFlush(cb.display)
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}
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fn (cb mut Clipboard) set_text(text string) bool {
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if cb.window == Window(C.None) {return false}
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cb.mutex.lock()
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cb.text = text
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cb.is_owner = true
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cb.take_ownership()
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XFlush(cb.display)
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cb.mutex.unlock()
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// sleep a little bit
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time.sleep(1)
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return cb.is_owner
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}
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fn (cb mut Clipboard) get_text() string {
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if cb.window == Window(C.None) {return ""}
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if cb.is_owner {
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return cb.text
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}
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cb.got_text = false
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//Request a list of possible conversions, if we're pasting.
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XConvertSelection(cb.display, cb.selection, cb.get_atom(.targets), cb.selection, cb.window, C.CurrentTime)
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//wait for the text to arrive
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mut retries := 5
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for {
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if cb.got_text || retries == 0 {break}
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time.usleep(50000)
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retries--
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}
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return cb.text
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}
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// this function is crucial to handling all the different data types
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// if we ever support other mimetypes they should be handled here
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fn (cb mut Clipboard) transmit_selection(xse &XSelectionEvent) bool {
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if xse.target == cb.get_atom(.targets) {
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targets := cb.get_supported_targets()
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XChangeProperty(xse.display, xse.requestor, xse.property, cb.get_atom(.xa_atom), 32, C.PropModeReplace, targets.data, targets.len)
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} else if cb.is_supported_target(xse.target) && cb.is_owner && cb.text != "" {
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cb.mutex.lock()
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XChangeProperty(xse.display, xse.requestor, xse.property, xse.target, 8, C.PropModeReplace, cb.text.str, cb.text.len)
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cb.mutex.unlock()
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} else {
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return false
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}
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return true
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}
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fn (cb mut Clipboard) start_listener(){
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event := XEvent{}
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mut sent_request := false
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mut to_be_requested := Atom(0)
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for {
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XNextEvent(cb.display, &event)
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if (event.@type == 0) {
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println("error")
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continue
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}
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match event.@type {
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C.DestroyNotify {
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if event.xdestroywindow.window == cb.window {
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return // we are done
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}
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}
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C.SelectionClear {
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if event.xselectionclear.window == cb.window && event.xselectionclear.selection == cb.selection {
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cb.mutex.lock()
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cb.is_owner = false
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cb.text = ""
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cb.mutex.unlock()
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}
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}
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C.SelectionRequest {
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if event.xselectionrequest.selection == cb.selection {
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mut xsre := &XSelectionRequestEvent{ display: 0 }
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xsre = &event.xselectionrequest
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mut xse := XSelectionEvent{
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@type: C.SelectionNotify // 31
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display: xsre.display
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requestor: xsre.requestor
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selection: xsre.selection
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time: xsre.time
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target: xsre.target
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property: xsre.property
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}
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if !cb.transmit_selection(&xse) {
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xse.property = new_atom(C.None)
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}
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XSendEvent(cb.display, xse.requestor, 0, C.PropertyChangeMask, &xse)
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XFlush(cb.display)
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}
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}
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C.SelectionNotify {
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if event.xselection.selection == cb.selection && event.xselection.property != Atom(C.None) {
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if event.xselection.target == cb.get_atom(.targets) && !sent_request {
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sent_request = true
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prop := read_property(cb.display, cb.window, cb.selection)
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to_be_requested = cb.pick_target(prop)
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if to_be_requested != Atom(0) {
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XConvertSelection(cb.display, cb.selection, to_be_requested, cb.selection, cb.window, C.CurrentTime)
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}
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} else if event.xselection.target == to_be_requested {
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sent_request = false
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to_be_requested = Atom(0)
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cb.mutex.lock()
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prop := read_property(event.xselection.display, event.xselection.requestor, event.xselection.property)
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XDeleteProperty(event.xselection.display, event.xselection.requestor, event.xselection.property)
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if cb.is_supported_target(prop.actual_type) {
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cb.got_text = true
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cb.text = string(prop.data) //TODO: return byteptr to support other mimetypes
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}
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cb.mutex.unlock()
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}
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}
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}
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C.PropertyNotify {}
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else {}
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}
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}
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}
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// Helpers
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// Initialize all the atoms we need
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fn (cb mut Clipboard) intern_atoms(){
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cb.atoms << Atom(4) //XA_ATOM
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cb.atoms << Atom(31) //XA_STRING
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for i, name in atom_names{
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only_if_exists := if i == int(atom_type.utf8_string) {1} else {0}
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cb.atoms << XInternAtom(cb.display, name.str, only_if_exists)
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if i == int(atom_type.utf8_string) && cb.atoms[i] == Atom(C.None) {
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cb.atoms[i] = cb.get_atom(.xa_string)
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}
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}
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}
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fn read_property(d &Display, w Window, p Atom) Property {
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actual_type := Atom(0)
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actual_format := 0
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nitems := 0
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bytes_after := 0
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ret := byteptr(0)
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mut read_bytes := 1024
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for {
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if ret != 0 {
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C.XFree(ret)
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}
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XGetWindowProperty(d, w, p, 0, read_bytes, 0, C.AnyPropertyType, &actual_type, &actual_format, &nitems, &bytes_after, &ret)
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read_bytes *= 2
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if bytes_after == 0 {break}
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}
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return Property{actual_type, actual_format, nitems, ret}
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}
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// Finds the best target given a local copy of a property.
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fn (cb &Clipboard) pick_target(prop Property) Atom {
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//The list of targets is a list of atoms, so it should have type XA_ATOM
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//but it may have the type TARGETS instead.
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if((prop.actual_type != cb.get_atom(.xa_atom) && prop.actual_type != cb.get_atom(.targets)) || prop.actual_format != 32)
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{
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//This would be really broken. Targets have to be an atom list
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//and applications should support this. Nevertheless, some
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//seem broken (MATLAB 7, for instance), so ask for STRING
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//next instead as the lowest common denominator
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return cb.get_atom(.xa_string)
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}
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else
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{
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atom_list := &Atom(prop.data)
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mut to_be_requested := Atom(0)
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//This is higher than the maximum priority.
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mut priority := math.max_i32
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for i := 0; i < prop.nitems; i++ {
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//See if this data type is allowed and of higher priority (closer to zero)
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//than the present one.
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if cb.is_supported_target(atom_list[i]) {
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index := cb.get_target_index(atom_list[i])
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if(priority > index && index >= 0)
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{
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priority = index
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to_be_requested = atom_list[i]
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}
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}
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}
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return to_be_requested
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}
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}
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fn (cb &Clipboard) get_atoms(types ...atom_type) []Atom {
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mut atoms := []Atom
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for typ in types {
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atoms << cb.atoms[typ]
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}
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return atoms
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}
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fn (cb &Clipboard) get_atom(typ atom_type) Atom {
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return cb.atoms[typ]
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}
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fn (cb &Clipboard) is_supported_target(target Atom) bool {
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return cb.get_target_index(target) >= 0
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}
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fn (cb &Clipboard) get_target_index(target Atom) int {
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for i, atom in cb.get_supported_targets() {
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if atom == target {return i}
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}
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return -1
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}
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fn (cb &Clipboard) get_supported_targets() []Atom {
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return cb.get_atoms(atom_type.utf8_string, .xa_string, .text, .text_plain, .text_html)
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}
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fn new_atom(value int) &Atom {
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mut atom := &Atom{}
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atom = value
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return atom
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}
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fn create_xwindow(display &Display) Window {
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N := C.DefaultScreen(display)
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return XCreateSimpleWindow(display, C.RootWindow(display, N), 0, 0, 1, 1,
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0, C.BlackPixel(display, N), C.WhitePixel(display, N))
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}
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fn new_display() &Display {
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return XOpenDisplay(C.NULL)
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}
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// create a new PRIMARY clipboard (only supported on Linux)
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pub fn new_primary() &Clipboard {
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return new_x11_clipboard(.primary)
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}
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