wayland: input method protocol

Author: CMurtagh-LGTM

CMakeLists.txt

@@ -60,6 +60,7 @@ boption(SCREENCOPY "  Screencopy" ON REQUIRES WAYLAND)
 boption(SCREENCOPY_ICC "    Image Copy Capture" ON REQUIRES WAYLAND)
 boption(SCREENCOPY_WLR "    Wlroots Screencopy" ON REQUIRES WAYLAND)
 boption(SCREENCOPY_HYPRLAND_TOPLEVEL "    Hyprland Toplevel Export" ON REQUIRES WAYLAND)
+boption(INPUT_METHOD "  Input Method" ON REQUIRES WAYLAND)
 boption(X11 "X11" ON)
 boption(I3 "I3/Sway" ON)
 boption(I3_IPC "  I3/Sway IPC" ON REQUIRES I3)

src/wayland/CMakeLists.txt

@@ -114,6 +114,11 @@ if (HYPRLAND)
 	add_subdirectory(hyprland)
 endif()
 
+if (INPUT_METHOD)
+	add_subdirectory(input_method)
+	list(APPEND WAYLAND_MODULES Quickshell.Wayland._InputMethod)
+endif()
+
 # widgets for qmenu
 target_link_libraries(quickshell-wayland PRIVATE
 	Qt::Quick Qt::Widgets Qt::WaylandClient Qt::WaylandClientPrivate

src/wayland/input_method/CMakeLists.txt

@@ -0,0 +1,38 @@
+set(INPUT_METHOD_PRINT_KETS OFF)
+
+qt_add_library(quickshell-wayland-input-method STATIC
+	input_method.cpp
+	keyboard_grab.cpp
+	virtual_keyboard.cpp
+	key_map_state.cpp
+	manager.cpp
+	qml.cpp
+	qml_helpers.cpp
+	c_helpers.cpp
+)
+
+target_compile_definitions(quickshell-wayland-input-method PRIVATE INPUT_METHOD_PRINT=0)
+
+qt_add_qml_module(quickshell-wayland-input-method
+	URI Quickshell.Wayland._InputMethod
+	VERSION 0.1
+	DEPENDENCIES QtQml
+)
+
+qs_add_module_deps_light(quickshell-wayland-input-method
+	Quickshell Quickshell.Wayland
+)
+
+install_qml_module(quickshell-wayland-input-method)
+
+wl_proto(zwp-input-method input-method-unstable-v2 "${CMAKE_CURRENT_SOURCE_DIR}")
+wl_proto(zwp-virtual-keyboard virtual-keyboard-unstable-v1 "${CMAKE_CURRENT_SOURCE_DIR}")
+
+target_link_libraries(quickshell-wayland-input-method PRIVATE
+	Qt::Quick Qt::WaylandClient Qt::WaylandClientPrivate wayland-client
+	zwp-input-method zwp-virtual-keyboard
+)
+
+qs_module_pch(quickshell-wayland-input-method SET large)
+
+target_link_libraries(quickshell PRIVATE quickshell-wayland-input-methodplugin)

src/wayland/input_method/c_helpers.cpp

@@ -0,0 +1,72 @@
+#include "c_helpers.hpp"
+#include <cstddef>
+#include <cstdio>
+#include <cstring>
+#include <utility>
+
+#include <qdebug.h>
+#include <qlogging.h>
+#include <sys/mman.h>
+#include <sys/shm.h>
+#include <unistd.h>
+
+namespace qs::wayland::input_method::impl {
+
+void FreeDeleter::operator()(const char* p) const {
+	std::free(const_cast<std::remove_const_t<char>*>(p)); // NOLINT
+}
+
+SharedMemory::SharedMemory(const char* shmName, int oFlag, size_t size)
+    : mShmName(shmName)
+    , mSize(size)
+    , fd(shm_open(this->mShmName, oFlag, 0))
+    , map(nullptr) {
+	if (this->fd == -1) {
+		perror("");
+		qDebug() << "Virtual keyboard failed to open shared memory";
+		return;
+	}
+	if (ftruncate(this->fd, static_cast<int>(size)) == -1) {
+		this->fd = -1;
+		perror("");
+		qDebug() << "Virtual keyboard failed to resize shared memory to" << size;
+		return;
+	}
+	this->map = static_cast<char*>(mmap(nullptr, this->mSize, PROT_WRITE, MAP_SHARED, this->fd, 0));
+	if (this->map == MAP_FAILED) {
+		perror("");
+		qDebug() << "Virtual keyboard failed to open shared memory";
+		return;
+	}
+}
+SharedMemory::~SharedMemory() {
+	if (this->fd != -1) {
+		close(this->fd);
+		shm_unlink(this->mShmName);
+	}
+	if (this->map != nullptr) {
+		munmap(this->map, this->mSize);
+	}
+}
+SharedMemory::SharedMemory(SharedMemory&& other) noexcept
+    : mShmName(std::exchange(other.mShmName, nullptr))
+    , mSize(std::exchange(other.mSize, 0))
+    , fd(std::exchange(other.fd, -1))
+    , map(std::exchange(other.map, nullptr)) {}
+SharedMemory& SharedMemory::operator=(SharedMemory&& other) noexcept {
+	this->mShmName = std::exchange(other.mShmName, nullptr);
+	this->mSize = std::exchange(other.mSize, 0);
+	this->fd = std::exchange(other.fd, -1);
+	this->map = std::exchange(other.map, nullptr);
+	return *this;
+}
+
+SharedMemory::operator bool() const { return fd != -1 && map != MAP_FAILED; }
+[[nodiscard]] int SharedMemory::get() const { return fd; }
+
+void SharedMemory::write(const char* string) {
+	if (!this->map) return;
+	strcpy(this->map, string);
+}
+
+} // namespace qs::wayland::input_method::impl

src/wayland/input_method/c_helpers.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <memory>
+
+#include <sys/mman.h>
+
+namespace qs::wayland::input_method::impl {
+
+struct FreeDeleter {
+	void operator()(const char* p) const;
+};
+// Dont use this for literals, only c strings that were allocated
+using uniqueCString = std::unique_ptr<const char, FreeDeleter>;
+
+// this is a bit half baked but works for what I need it for
+class SharedMemory {
+public:
+	SharedMemory(const char* shmName, int oFlag, size_t size);
+	~SharedMemory();
+	SharedMemory(const SharedMemory&) = delete;
+	SharedMemory(SharedMemory&& other) noexcept;
+	SharedMemory& operator=(const SharedMemory&) = delete;
+	SharedMemory& operator=(SharedMemory&& other) noexcept;
+
+	[[nodiscard]] operator bool() const;
+	[[nodiscard]] int get() const;
+
+	void write(const char* string);
+
+private:
+	const char* mShmName;
+	size_t mSize;
+	int fd;
+	char* map = nullptr;
+};
+
+} // namespace qs::wayland::input_method::impl