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v/vlib/clipboard/x11/clipboard.c.v

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// Currently there is only X11 Selections support and no way to handle Wayland
// but since Wayland isn't extremely adopted, we are covering almost all Linux distros.
module x11
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import time
import sync
import math
$if freebsd {
#flag -I/usr/local/include
#flag -L/usr/local/lib
} $else $if openbsd {
#flag -I/usr/X11R6/include
#flag -L/usr/X11R6/lib
}
#flag -lX11
#include <X11/Xlib.h> # Please install a package with the X11 development headers, for example: `apt-get install libx11-dev`
// X11
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[typedef]
struct C.Display {
}
type Window = u64
type Atom = u64
fn C.XInitThreads() int
fn C.XCloseDisplay(d &C.Display)
fn C.XFlush(d &C.Display)
fn C.XDestroyWindow(d &C.Display, w Window)
fn C.XNextEvent(d &C.Display, e &C.XEvent)
fn C.XSetSelectionOwner(d &C.Display, a Atom, w Window, time int)
fn C.XGetSelectionOwner(d &C.Display, a Atom) Window
fn C.XChangeProperty(d &C.Display, requestor Window, property Atom, typ Atom, format int, mode int, data voidptr, nelements int) int
fn C.XSendEvent(d &C.Display, requestor Window, propogate int, mask i64, event &C.XEvent)
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fn C.XInternAtom(d &C.Display, typ &u8, only_if_exists int) Atom
fn C.XCreateSimpleWindow(d &C.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 &u8) &C.Display
fn C.XConvertSelection(d &C.Display, selection Atom, target Atom, property Atom, requestor Window, time int) int
fn C.XSync(d &C.Display, discard int) int
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fn C.XGetWindowProperty(d &C.Display, w Window, property Atom, offset i64, length i64, delete int, req_type Atom, actual_type_return &Atom, actual_format_return &int, nitems &u64, bytes_after_return &u64, prop_return &&u8) int
fn C.XDeleteProperty(d &C.Display, w Window, property Atom) int
fn C.DefaultScreen(display &C.Display) int
fn C.RootWindow(display &C.Display, screen_number int) Window
fn C.BlackPixel(display &C.Display, screen_number int) u32
fn C.WhitePixel(display &C.Display, screen_number int) u32
fn C.XFree(data voidptr)
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fn todo_del() {}
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[typedef]
struct C.XSelectionRequestEvent {
mut:
display &C.Display // Display the event was read from
owner Window
requestor Window
selection Atom
target Atom
property Atom
time int
}
[typedef]
struct C.XSelectionEvent {
mut:
@type int
display &C.Display // Display the event was read from
requestor Window
selection Atom
target Atom
property Atom
time int
}
[typedef]
struct C.XSelectionClearEvent {
mut:
window Window
selection Atom
}
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[typedef]
struct C.XDestroyWindowEvent {
mut:
window Window
}
[typedef]
union C.XEvent {
mut:
@type int
xdestroywindow C.XDestroyWindowEvent
xselectionclear C.XSelectionClearEvent
xselectionrequest C.XSelectionRequestEvent
xselection C.XSelectionEvent
}
const (
atom_names = ['TARGETS', 'CLIPBOARD', 'PRIMARY', 'SECONDARY', 'TEXT', 'UTF8_STRING', 'text/plain',
'text/html']
)
// UNSUPPORTED TYPES: MULTIPLE, INCR, TIMESTAMP, image/bmp, image/jpeg, image/tiff, image/png
// all the atom types we need
// currently we only support text
// in the future, maybe we can extend this
// to support other mime types
enum AtomType {
xa_atom = 0 // value 4
xa_string = 1 // value 31
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targets = 2
clipboard = 3
primary = 4
secondary = 5
text = 6
utf8_string = 7
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text_plain = 8
text_html = 9
}
[heap]
pub struct Clipboard {
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display &C.Display
mut:
selection Atom // the selection atom
window Window
atoms []Atom
mutex &sync.Mutex
text string // text data sent or received
got_text bool // used to confirm that we have got the text
is_owner bool // to save selection owner state
}
struct Property {
actual_type Atom
actual_format int
nitems u64
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data &u8
}
// new_clipboard returns a new `Clipboard` instance allocated on the heap.
// The `Clipboard` resources can be released with `free()`
pub fn new_clipboard() &Clipboard {
return new_x11_clipboard(.clipboard)
}
// new_x11_clipboard initializes a new clipboard of the given selection type.
// Multiple clipboard instance types can be initialized and used separately.
fn new_x11_clipboard(selection AtomType) &Clipboard {
if selection !in [.clipboard, .primary, .secondary] {
panic('Wrong AtomType. Must be one of .primary, .secondary or .clipboard.')
}
// init x11 thread support
status := C.XInitThreads()
if status == 0 {
println('WARN: this system does not support threads; clipboard will cause the program to lock.')
}
display := new_display()
if display == C.NULL {
println('ERROR: No X Server running. Clipboard cannot be used.')
return &Clipboard{
display: 0
mutex: sync.new_mutex()
}
}
mut cb := &Clipboard{
display: display
window: create_xwindow(display)
mutex: sync.new_mutex()
}
cb.intern_atoms()
cb.selection = cb.get_atom(selection)
// start the listener on another thread or
// we will be locked and will have to hard exit
go cb.start_listener()
return cb
}
pub fn (cb &Clipboard) check_availability() bool {
return cb.display != C.NULL
}
pub fn (mut cb Clipboard) free() {
C.XDestroyWindow(cb.display, cb.window)
cb.window = Window(0)
// FIX ME: program hangs when closing display
// XCloseDisplay(cb.display)
}
pub fn (mut cb Clipboard) clear() {
cb.mutex.@lock()
C.XSetSelectionOwner(cb.display, cb.selection, Window(0), C.CurrentTime)
C.XFlush(cb.display)
cb.is_owner = false
cb.text = ''
cb.mutex.unlock()
}
pub fn (cb &Clipboard) has_ownership() bool {
return cb.is_owner
}
fn (cb &Clipboard) take_ownership() {
C.XSetSelectionOwner(cb.display, cb.selection, cb.window, C.CurrentTime)
C.XFlush(cb.display)
}
// set_text stores `text` in the system clipboard.
pub fn (mut cb Clipboard) set_text(text string) bool {
if cb.window == Window(0) {
return false
}
cb.mutex.@lock()
cb.text = text
cb.is_owner = true
cb.take_ownership()
C.XFlush(cb.display)
cb.mutex.unlock()
// sleep a little bit
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time.sleep(1 * time.millisecond)
return cb.is_owner
}
pub fn (mut cb Clipboard) get_text() string {
if cb.window == Window(0) {
return ''
}
if cb.is_owner {
return cb.text
}
cb.got_text = false
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// Request a list of possible conversions, if we're pasting.
C.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
mut retries := 5
for {
if cb.got_text || retries == 0 {
break
}
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time.sleep(50 * time.millisecond)
retries--
}
return cb.text
}
// transmit_selection is crucial to handling all the different data types.
// If we ever support other mimetypes they should be handled here.
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fn (mut cb Clipboard) transmit_selection(xse &C.XSelectionEvent) bool {
if xse.target == cb.get_atom(.targets) {
targets := cb.get_supported_targets()
C.XChangeProperty(xse.display, xse.requestor, xse.property, cb.get_atom(.xa_atom),
32, C.PropModeReplace, targets.data, targets.len)
} else if cb.is_supported_target(xse.target) && cb.is_owner && cb.text != '' {
cb.mutex.@lock()
C.XChangeProperty(xse.display, xse.requestor, xse.property, xse.target, 8, C.PropModeReplace,
cb.text.str, cb.text.len)
cb.mutex.unlock()
} else {
return false
}
return true
}
fn (mut cb Clipboard) start_listener() {
event := C.XEvent{}
mut sent_request := false
mut to_be_requested := Atom(0)
for {
time.sleep(1 * time.millisecond)
C.XNextEvent(cb.display, &event)
if unsafe { event.@type == 0 } {
println('error')
continue
}
match unsafe { event.@type } {
C.DestroyNotify {
if unsafe { event.xdestroywindow.window == cb.window } {
// we are done
return
}
}
C.SelectionClear {
if unsafe { event.xselectionclear.window == cb.window } && unsafe {
event.xselectionclear.selection == cb.selection
} {
cb.mutex.@lock()
cb.is_owner = false
cb.text = ''
cb.mutex.unlock()
}
}
C.SelectionRequest {
if unsafe { event.xselectionrequest.selection == cb.selection } {
mut xsre := &C.XSelectionRequestEvent{
display: 0
}
xsre = unsafe { &event.xselectionrequest }
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mut xse := C.XSelectionEvent{
@type: C.SelectionNotify // 31
display: xsre.display
requestor: xsre.requestor
selection: xsre.selection
time: xsre.time
target: xsre.target
property: xsre.property
}
if !cb.transmit_selection(&xse) {
xse.property = Atom(0)
}
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C.XSendEvent(cb.display, xse.requestor, 0, C.PropertyChangeMask, voidptr(&xse))
C.XFlush(cb.display)
}
}
C.SelectionNotify {
if unsafe {
event.xselection.selection == cb.selection
&& event.xselection.property != Atom(0)
} {
if unsafe { event.xselection.target == cb.get_atom(.targets) && !sent_request } {
sent_request = true
prop := read_property(cb.display, cb.window, cb.selection)
to_be_requested = cb.pick_target(prop)
if to_be_requested != Atom(0) {
C.XConvertSelection(cb.display, cb.selection, to_be_requested,
cb.selection, cb.window, C.CurrentTime)
}
} else if unsafe { event.xselection.target == to_be_requested } {
sent_request = false
to_be_requested = Atom(0)
cb.mutex.@lock()
prop := unsafe {
read_property(event.xselection.display, event.xselection.requestor,
event.xselection.property)
}
unsafe {
C.XDeleteProperty(event.xselection.display, event.xselection.requestor,
event.xselection.property)
}
if cb.is_supported_target(prop.actual_type) {
cb.got_text = true
unsafe {
cb.text = prop.data.vstring() // TODO: return byteptr to support other mimetypes
}
}
cb.mutex.unlock()
}
}
}
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C.PropertyNotify {}
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else {}
}
}
}
/*
* Helpers
*/
// intern_atoms initializes all the atoms we need.
fn (mut cb Clipboard) intern_atoms() {
cb.atoms << Atom(4) // XA_ATOM
cb.atoms << Atom(31) // XA_STRING
for i, name in x11.atom_names {
only_if_exists := if i == int(AtomType.utf8_string) { 1 } else { 0 }
cb.atoms << C.XInternAtom(cb.display, &char(name.str), only_if_exists)
if i == int(AtomType.utf8_string) && cb.atoms[i] == Atom(0) {
cb.atoms[i] = cb.get_atom(.xa_string)
}
}
}
fn read_property(d &C.Display, w Window, p Atom) Property {
actual_type := Atom(0)
actual_format := 0
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nitems := u64(0)
bytes_after := u64(0)
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ret := &u8(0)
mut read_bytes := 1024
for {
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if ret != 0 {
C.XFree(ret)
}
C.XGetWindowProperty(d, w, p, 0, read_bytes, 0, 0, &actual_type, &actual_format,
&nitems, &bytes_after, &ret)
read_bytes *= 2
if bytes_after == 0 {
break
}
}
return Property{actual_type, actual_format, nitems, ret}
}
// pick_target finds the best target given a local copy of a property.
fn (cb &Clipboard) pick_target(prop Property) Atom {
// The list of targets is a list of atoms, so it should have type XA_ATOM
// but it may have the type TARGETS instead.
if (prop.actual_type != cb.get_atom(.xa_atom) && prop.actual_type != cb.get_atom(.targets))
|| prop.actual_format != 32 {
// This would be really broken. Targets have to be an atom list
// and applications should support this. Nevertheless, some
// seem broken (MATLAB 7, for instance), so ask for STRING
// next instead as the lowest common denominator
return cb.get_atom(.xa_string)
} else {
atom_list := &Atom(voidptr(prop.data))
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mut to_be_requested := Atom(0)
// This is higher than the maximum priority.
mut priority := math.max_i32
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for i in 0 .. prop.nitems {
// See if this data type is allowed and of higher priority (closer to zero)
// than the present one.
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target := unsafe { atom_list[i] }
if cb.is_supported_target(target) {
index := cb.get_target_index(target)
if priority > index && index >= 0 {
priority = index
to_be_requested = target
}
}
}
return to_be_requested
}
}
fn (cb &Clipboard) get_atoms(types ...AtomType) []Atom {
mut atoms := []Atom{}
for typ in types {
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atoms << cb.atoms[typ]
}
return atoms
}
fn (cb &Clipboard) get_atom(typ AtomType) Atom {
return cb.atoms[typ]
}
fn (cb &Clipboard) is_supported_target(target Atom) bool {
return cb.get_target_index(target) >= 0
}
fn (cb &Clipboard) get_target_index(target Atom) int {
for i, atom in cb.get_supported_targets() {
if atom == target {
return i
}
}
return -1
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}
fn (cb &Clipboard) get_supported_targets() []Atom {
return cb.get_atoms(AtomType.utf8_string, .xa_string, .text, .text_plain, .text_html)
}
fn create_xwindow(display &C.Display) Window {
n := C.DefaultScreen(display)
return C.XCreateSimpleWindow(display, C.RootWindow(display, n), 0, 0, 1, 1, 0, C.BlackPixel(display,
n), C.WhitePixel(display, n))
}
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fn new_display() &C.Display {
return C.XOpenDisplay(C.NULL)
}
// new_primary returns a new X11 `PRIMARY` type `Clipboard` instance allocated on the heap.
// Please note: new_primary only works on X11 based systems.
pub fn new_primary() &Clipboard {
return new_x11_clipboard(.primary)
}