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#include "cru/platform/gui/xcb/InputMethod.h"
#include "cru/platform/Check.h"
#include "cru/platform/gui/InputMethod.h"
#include "cru/platform/gui/xcb/UiApplication.h"
#include "cru/platform/gui/xcb/Window.h"
#include <xcb-imdkit/encoding.h>
#include <xcb-imdkit/imclient.h>
namespace cru::platform::gui::xcb {
namespace {
void XimLogger(const char *, ...) {}
} // namespace
XcbXimInputMethodManager::XcbXimInputMethodManager(
XcbUiApplication *application)
: application_(application) {
auto XimOpenCallback = [](xcb_xim_t *im, void *user_data) {};
xcb_xim_im_callback kXimCallbacks = {
.commit_string =
[](xcb_xim_t *im, xcb_xic_t ic, uint32_t flag, char *str,
uint32_t length, uint32_t *keysym, size_t nKeySym,
void *user_data) {
auto manager = static_cast<XcbXimInputMethodManager *>(user_data);
if (xcb_xim_get_encoding(im) == XCB_XIM_UTF8_STRING) {
manager->DispatchCommit(im, ic, std::string(str, length));
} else if (xcb_xim_get_encoding(im) == XCB_XIM_COMPOUND_TEXT) {
size_t newLength = 0;
char *utf8 = xcb_compound_text_to_utf8(str, length, &newLength);
if (utf8) {
int l = newLength;
manager->DispatchCommit(im, ic, std::string(str, length));
}
}
},
.preedit_draw =
[](xcb_xim_t *im, xcb_xic_t ic, xcb_im_preedit_draw_fr_t *frame,
void *user_data) {
auto manager = static_cast<XcbXimInputMethodManager *>(user_data);
CompositionText text;
if (!(frame->status & 1)) {
text.text = String::FromUtf8(
reinterpret_cast<const std::byte *>(frame->preedit_string),
frame->length_of_preedit_string);
text.selection = frame->caret;
}
manager->DispatchComposition(im, ic, std::move(text));
}};
xcb_compound_text_init();
im_ = xcb_xim_create(application->GetXcbConnection(), 0, "@im=fcitx");
xcb_xim_set_im_callback(im_, &kXimCallbacks, static_cast<void *>(this));
xcb_xim_set_log_handler(im_, XimLogger);
xcb_xim_set_use_compound_text(im_, true);
xcb_xim_set_use_utf8_string(im_, true);
xcb_xim_open(im_, XimOpenCallback, true, this);
}
XcbXimInputMethodManager::~XcbXimInputMethodManager() {
xcb_xim_close(im_);
xcb_xim_destroy(im_);
}
xcb_xim_t *XcbXimInputMethodManager::GetXcbXim() { return im_; }
void XcbXimInputMethodManager::DispatchCommit(xcb_xim_t *im, xcb_xic_t ic,
std::string text) {
for (auto window : application_->GetAllWindow()) {
auto input_method_context = window->GetInputMethodContext();
auto context = CheckPlatform<XcbXimInputMethodContext>(input_method_context,
GetPlatformIdUtf8());
if (context->ic_ == ic) {
context->text_event_.Raise(String::FromUtf8(text));
}
}
}
void XcbXimInputMethodManager::DispatchComposition(xcb_xim_t *im, xcb_xic_t ic,
CompositionText text) {
for (auto window : application_->GetAllWindow()) {
auto input_method_context = window->GetInputMethodContext();
auto context = CheckPlatform<XcbXimInputMethodContext>(input_method_context,
GetPlatformIdUtf8());
if (context->ic_ == ic) {
context->composition_text_ = std::move(text);
context->composition_event_.Raise(nullptr);
}
}
}
bool XcbXimInputMethodManager::HandleXEvent(xcb_generic_event_t *event) {
if (xcb_xim_filter_event(im_, event)) return true;
for (auto window : application_->GetAllWindow()) {
auto input_method_context = window->GetInputMethodContext();
auto context = CheckPlatform<XcbXimInputMethodContext>(input_method_context,
GetPlatformIdUtf8());
// Forward event to input method if IC is created.
if (context->ic_ && (((event->response_type & ~0x80) == XCB_KEY_PRESS) ||
((event->response_type & ~0x80) == XCB_KEY_RELEASE))) {
xcb_xim_forward_event(im_, *context->ic_, (xcb_key_press_event_t *)event);
return true;
}
}
return false;
}
XcbXimInputMethodContext::XcbXimInputMethodContext(
XcbXimInputMethodManager *manager, XcbWindow *window)
: manager_(manager), window_(window), enabled_(false) {
window->CreateEvent()->AddSpyOnlyHandler([this, window] {
if (enabled_) {
CreateIc(*window->GetXcbWindow());
}
});
window->DestroyEvent()->AddSpyOnlyHandler([this] { DestroyIc(); });
window->FocusEvent()->AddSpyOnlyHandler([this, window] {
auto input_method_context = window->GetInputMethodContext();
auto context = CheckPlatform<XcbXimInputMethodContext>(input_method_context,
GetPlatformIdUtf8());
if (context->enabled_ && context->ic_) {
xcb_xim_set_ic_focus(context->manager_->GetXcbXim(), *context->ic_);
}
});
}
XcbXimInputMethodContext::~XcbXimInputMethodContext() {}
bool XcbXimInputMethodContext::ShouldManuallyDrawCompositionText() {
return false;
}
void XcbXimInputMethodContext::EnableIME() {
if (enabled_) return;
enabled_ = true;
if (!ic_ && window_->GetXcbWindow()) {
CreateIc(*window_->GetXcbWindow());
}
}
void XcbXimInputMethodContext::DisableIME() {
if (!enabled_) return;
enabled_ = false;
DestroyIc();
}
void XcbXimInputMethodContext::CompleteComposition() { CancelComposition(); }
void XcbXimInputMethodContext::CancelComposition() {
if (!ic_) return;
auto XimResetIcCallback = [](xcb_xim_t *im, xcb_xic_t ic,
xcb_im_reset_ic_reply_fr_t *reply,
void *user_data) {};
xcb_xim_reset_ic(manager_->GetXcbXim(), *ic_, XimResetIcCallback, this);
}
static void EmptyXimDestroyIcCallback(xcb_xim_t *im, xcb_xic_t ic,
void *user_data) {}
void XcbXimInputMethodContext::SetCandidateWindowPosition(const Point &point) {
if (!ic_) return;
xcb_point_t spot;
spot.x = point.x;
spot.y = point.y;
xcb_xim_nested_list nested = xcb_xim_create_nested_list(
manager_->GetXcbXim(), XCB_XIM_XNSpotLocation, &spot, NULL);
xcb_xim_set_ic_values(manager_->GetXcbXim(), *ic_, EmptyXimDestroyIcCallback,
this, XCB_XIM_XNPreeditAttributes, &nested, NULL);
::free(nested.data);
}
CompositionText XcbXimInputMethodContext::GetCompositionText() {
return composition_text_;
}
IEvent<std::nullptr_t> *XcbXimInputMethodContext::CompositionStartEvent() {
return &composition_start_event_;
}
IEvent<std::nullptr_t> *XcbXimInputMethodContext::CompositionEndEvent() {
return &composition_end_event_;
}
IEvent<std::nullptr_t> *XcbXimInputMethodContext::CompositionEvent() {
return &composition_event_;
}
IEvent<StringView> *XcbXimInputMethodContext::TextEvent() {
return &text_event_;
}
void XcbXimInputMethodContext::CreateIc(xcb_window_t window) {
auto XimCreateIcCallback = [](xcb_xim_t *im, xcb_xic_t ic, void *user_data) {
auto context = static_cast<XcbXimInputMethodContext *>(user_data);
context->ic_ = ic;
if (context->window_->HasFocus()) {
xcb_xim_set_ic_focus(context->manager_->GetXcbXim(), ic);
}
};
uint32_t input_style = XCB_IM_PreeditPosition | XCB_IM_StatusArea;
xcb_xim_create_ic(manager_->GetXcbXim(), XimCreateIcCallback, this,
XCB_XIM_XNInputStyle, &input_style, XCB_XIM_XNClientWindow,
&window, XCB_XIM_XNFocusWindow, &window, NULL);
}
void XcbXimInputMethodContext::DestroyIc() {
if (!ic_) return;
xcb_xim_destroy_ic(manager_->GetXcbXim(), *ic_, EmptyXimDestroyIcCallback,
this);
ic_ = std::nullopt;
}
} // namespace cru::platform::gui::xcb
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