Add clipboard

Signed-off-by: Slendi <slendi@socopon.com>
2025-10-10 13:50:28 +03:00
parent e43799d11b
commit 86024e2c03
5 changed files with 267 additions and 66 deletions
--- a/src/App.cpp
+++ b/src/App.cpp
@@ -191,6 +191,8 @@ auto App::run() -> void
 	while (m_running) {
 		pump_events();
 		tick();
+		m_kbd.typing.clear();
+		m_kbd.clear_transients();
 		std::this_thread::sleep_for(std::chrono::milliseconds(16));
 	}
 }
@@ -249,19 +251,23 @@ auto App::init_wayland() -> void
 			close(fd);
 		} };

-		auto kb_enter { [](void *, wl_keyboard *, u32, wl_surface *,
-			                wl_array *) -> void { } };
+		auto kb_enter { [](void *data, wl_keyboard *, u32 serial, wl_surface *,
+			                wl_array *) -> void {
+			static_cast<App *>(data)->m_last_serial = serial;
+		} };
 		auto kb_leave
 		    = [](void *data, wl_keyboard *, u32, wl_surface *) -> void {
 			static_cast<App *>(data)->m_kbd.held.clear();
 		};

-		auto kb_key { [](void *data, wl_keyboard *, u32, u32, u32 key,
+		auto kb_key { [](void *data, wl_keyboard *, u32 serial, u32, u32 key,
 			              u32 state) -> void {
 			auto *app { static_cast<App *>(data) };
 			if (!app->m_kbd.xkb_state_v)
 				return;

+			app->m_last_serial = serial;
+
 			xkb_keycode_t kc = key + 8;

 			if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
@@ -308,6 +314,11 @@ auto App::init_wayland() -> void
 					app->m_kbd.typing.push_back('\n');
 					handled = true;
 					break;
+				case XKB_KEY_v:
+				case XKB_KEY_V:
+					app->m_kbd.typing.push_back('v');
+					handled = true;
+					break;
 				case XKB_KEY_w:
 				case XKB_KEY_W:
 					if (ctrl) {
@@ -490,6 +501,99 @@ auto App::init_wayland() -> void
 			        registry, name, &zwp_text_input_manager_v3_interface, 1));
 			app->m_ime.supported = true;
 			ensure_text_input(app);
+		} else if (std::strcmp(interface, wl_data_device_manager_interface.name)
+		    == 0) {
+			app->m_wayland.ddm
+			    = static_cast<wl_data_device_manager *>(wl_registry_bind(
+			        registry, name, &wl_data_device_manager_interface,
+			        std::min<uint32_t>(version, 3)));
+			if (app->m_wayland.ddm && !app->m_wayland.ddev) {
+				app->m_wayland.ddev = wl_data_device_manager_get_data_device(
+				    app->m_wayland.ddm, app->m_wayland.seat);
+				static wl_data_device_listener const ddev_l = {
+					.data_offer =
+					    [](void *data, wl_data_device *, wl_data_offer *offer) {
+					        auto *app = static_cast<App *>(data);
+					        static wl_data_offer_listener const offer_l = {
+						        .offer =
+						            [](void *data, wl_data_offer *,
+						                char const *mime) {
+						                auto *app = static_cast<App *>(data);
+						                (void)app;
+						                (void)mime;
+						            },
+#if WL_DATA_OFFER_SOURCE_ACTIONS_SINCE_VERSION
+						        .source_actions
+						        = [](void *, wl_data_offer *, uint32_t) {},
+						        .action
+						        = [](void *, wl_data_offer *, uint32_t) {}
+#endif
+					        };
+					        wl_data_offer_add_listener(offer, &offer_l, app);
+					        // swap old
+					        if (app->m_wayland.curr_offer
+					            && app->m_wayland.curr_offer != offer)
+						        wl_data_offer_destroy(
+						            app->m_wayland.curr_offer);
+					        app->m_wayland.curr_offer = offer;
+					    },
+					.enter
+					= [](void *, wl_data_device *, uint32_t, wl_surface *,
+					      wl_fixed_t, wl_fixed_t, wl_data_offer *) {},
+					.leave = [](void *, wl_data_device *) {},
+					.motion = [](void *, wl_data_device *, uint32_t, wl_fixed_t,
+					              wl_fixed_t) {},
+					.drop = [](void *, wl_data_device *) {},
+					.selection =
+					    [](void *data, wl_data_device *, wl_data_offer *offer) {
+					        auto *app = static_cast<App *>(data);
+					        if (!offer) {
+						        app->m_clipboard_cache.clear();
+						        return;
+					        }
+					        char const *mime_utf8 = "text/plain;charset=utf-8";
+					        char const *mime_plain = "text/plain";
+					        int fds[2];
+					        if (pipe(fds) != 0)
+						        return;
+					        wl_data_offer_receive(offer, mime_utf8, fds[1]);
+					        wl_display_flush(app->m_wayland.display);
+					        close(fds[1]);
+					        std::string data_utf8;
+					        char buf[4096];
+					        for (;;) {
+						        ssize_t n = read(fds[0], buf, sizeof(buf));
+						        if (n > 0)
+							        data_utf8.append(buf, buf + n);
+						        else
+							        break;
+					        }
+					        close(fds[0]);
+
+					        if (data_utf8.empty()) {
+						        if (pipe(fds) != 0)
+							        return;
+						        wl_data_offer_receive(
+						            offer, mime_plain, fds[1]);
+						        wl_display_flush(app->m_wayland.display);
+						        close(fds[1]);
+						        std::string data_plain;
+						        for (;;) {
+							        ssize_t n = read(fds[0], buf, sizeof(buf));
+							        if (n > 0)
+								        data_plain.append(buf, buf + n);
+							        else
+								        break;
+						        }
+						        close(fds[0]);
+						        app->m_clipboard_cache = std::move(data_plain);
+					        } else {
+						        app->m_clipboard_cache = std::move(data_utf8);
+					        }
+					    },
+				};
+				wl_data_device_add_listener(app->m_wayland.ddev, &ddev_l, app);
+			}
 		}
 	};

@@ -981,3 +1085,57 @@ auto App::pump_events() -> void
 		}
 	}
 }
+
+auto App::clipboard(std::string_view const &str) -> void
+{
+	if (!m_wayland.ddm || !m_wayland.ddev || !m_wayland.seat)
+		return;
+	if (m_last_serial == 0)
+		return;
+
+	if (m_wayland.curr_source) {
+		wl_data_source_destroy(m_wayland.curr_source);
+		m_wayland.curr_source = nullptr;
+	}
+	m_wayland.curr_source
+	    = wl_data_device_manager_create_data_source(m_wayland.ddm);
+
+	static wl_data_source_listener const src_l = {
+		.target = [](void *, wl_data_source *, char const *) {},
+		.send =
+		    [](void *data, wl_data_source *, char const *mime, int32_t fd) {
+		        auto *app = static_cast<App *>(data);
+		        (void)mime;
+		        size_t off = 0;
+		        while (off < app->m_clipboard_cache.size()) {
+			        ssize_t n = write(fd, app->m_clipboard_cache.data() + off,
+			            app->m_clipboard_cache.size() - off);
+			        if (n <= 0)
+				        break;
+			        off += static_cast<size_t>(n);
+		        }
+		        close(fd);
+		    },
+		.cancelled =
+		    [](void *data, wl_data_source *src) {
+		        auto *app = static_cast<App *>(data);
+		        if (app->m_wayland.curr_source == src)
+			        app->m_wayland.curr_source = nullptr;
+		        wl_data_source_destroy(src);
+		    },
+#if WL_DATA_SOURCE_DND_DROP_PERFORMED_SINCE_VERSION
+		.dnd_drop_performed = [](void *, wl_data_source *) {},
+		.dnd_finished = [](void *, wl_data_source *) {},
+		.action = [](void *, wl_data_source *, uint32_t) {}
+#endif
+	};
+	wl_data_source_add_listener(m_wayland.curr_source, &src_l, this);
+	wl_data_source_offer(m_wayland.curr_source, "text/plain;charset=utf-8");
+	wl_data_source_offer(m_wayland.curr_source, "text/plain");
+
+	m_clipboard_cache.assign(str.begin(), str.end());
+
+	wl_data_device_set_selection(
+	    m_wayland.ddev, m_wayland.curr_source, m_last_serial);
+	wl_display_flush(m_wayland.display);
+}
--- a/src/App.hpp
+++ b/src/App.hpp
@@ -6,6 +6,7 @@

 #include <EGL/egl.h>
 #include <libportal/portal.h>
+#include <wayland-client-protocol.h>
 extern "C" {
 #include "blur-client-protocol.h"
 #define namespace namespace_
@@ -50,13 +51,19 @@ private:
 	auto ensure_egl_surface() -> void;
 	auto update_blur_region() -> void;
 	auto process_pending_text_input() -> void;
-	auto update_text_input_state(std::pmr::string const &text, usize id,
-	    Rectangle field_rect) -> void;
+	auto update_text_input_state(
+	    std::pmr::string const &text, usize id, Rectangle field_rect) -> void;
 	auto theme() const -> ColorScheme const &
 	{
 		return m_themes[m_active_theme];
 	}

+	auto clipboard() const -> std::pmr::string const &
+	{
+		return m_clipboard_cache;
+	}
+	auto clipboard(std::string_view const &str) -> void;
+
 	static void on_settings_changed(XdpSettings * /*self*/, char const *ns,
 	    char const *key, GVariant * /*value*/, gpointer data);

@@ -75,7 +82,13 @@ private:
 		org_kde_kwin_blur *kde_blur {};
 		zwp_text_input_manager_v3 *text_input_mgr {};
 		zwp_text_input_v3 *text_input {};
+		wl_data_device_manager *ddm {};
+		wl_data_device *ddev {};
+		wl_data_offer *curr_offer {};
+		wl_data_source *curr_source {};
 	} m_wayland;
+	std::pmr::string m_clipboard_cache;
+	u32 m_last_serial { 0 };

 	struct {
 		EGLDisplay edpy { EGL_NO_DISPLAY };
--- a/src/ImGui.cpp
+++ b/src/ImGui.cpp
@@ -19,67 +19,52 @@ struct CodepointSpan {
 	usize end {};
 };

-auto decode_utf8(std::string_view text) -> std::vector<CodepointSpan>
+constexpr auto utf8_rune_from_first(char const *s) -> u32
+{
+	u8 b0 = static_cast<u8>(s[0]);
+	if (b0 < 0x80)
+		return b0;
+
+	if ((b0 & 0xE0) == 0xC0)
+		return ((b0 & 0x1F) << 6) | (static_cast<u8>(s[1]) & 0x3F);
+
+	if ((b0 & 0xF0) == 0xE0)
+		return ((b0 & 0x0F) << 12) | ((static_cast<u8>(s[1]) & 0x3F) << 6)
+		    | (static_cast<u8>(s[2]) & 0x3F);
+
+	if ((b0 & 0xF8) == 0xF0)
+		return ((b0 & 0x07) << 18) | ((static_cast<u8>(s[1]) & 0x3F) << 12)
+		    | ((static_cast<u8>(s[2]) & 0x3F) << 6)
+		    | (static_cast<u8>(s[3]) & 0x3F);
+
+	return 0xFFFD;
+}
+
+constexpr auto decode_utf8(std::string_view text) -> std::vector<CodepointSpan>
 {
 	std::vector<CodepointSpan> spans;
 	usize i = 0;
 	spans.reserve(text.size());

 	while (i < text.size()) {
-		u8 const byte = static_cast<u8>(text[i]);
-		usize const start = i;
-		usize length = 1;
-		u32 cp = 0xFFFD;
+		u8 b = static_cast<u8>(text[i]);
+		usize len = 1;

-		if (byte < 0x80) {
-			cp = byte;
-		} else if ((byte & 0xE0) == 0xC0) {
-			if (i + 1 < text.size()) {
-				u8 const b1 = static_cast<u8>(text[i + 1]);
-				if ((b1 & 0xC0) == 0x80) {
-					u32 const t = ((static_cast<u32>(byte) & 0x1F) << 6)
-					    | (static_cast<u32>(b1) & 0x3F);
-					if (t >= 0x80) {
-						cp = t;
-						length = 2;
-					}
-				}
-			}
-		} else if ((byte & 0xF0) == 0xE0) {
-			if (i + 2 < text.size()) {
-				u8 const b1 = static_cast<u8>(text[i + 1]);
-				u8 const b2 = static_cast<u8>(text[i + 2]);
-				if ((b1 & 0xC0) == 0x80 && (b2 & 0xC0) == 0x80) {
-					u32 const t = ((static_cast<u32>(byte) & 0x0F) << 12)
-					    | ((static_cast<u32>(b1) & 0x3F) << 6)
-					    | (static_cast<u32>(b2) & 0x3F);
-					if (t >= 0x800 && (t < 0xD800 || t > 0xDFFF)) {
-						cp = t;
-						length = 3;
-					}
-				}
-			}
-		} else if ((byte & 0xF8) == 0xF0) {
-			if (i + 3 < text.size()) {
-				u8 const b1 = static_cast<u8>(text[i + 1]);
-				u8 const b2 = static_cast<u8>(text[i + 2]);
-				u8 const b3 = static_cast<u8>(text[i + 3]);
-				if ((b1 & 0xC0) == 0x80 && (b2 & 0xC0) == 0x80
-				    && (b3 & 0xC0) == 0x80) {
-					u32 const t = ((static_cast<u32>(byte) & 0x07) << 18)
-					    | ((static_cast<u32>(b1) & 0x3F) << 12)
-					    | ((static_cast<u32>(b2) & 0x3F) << 6)
-					    | (static_cast<u32>(b3) & 0x3F);
-					if (t >= 0x10000 && t <= 0x10FFFF) {
-						cp = t;
-						length = 4;
-					}
-				}
-			}
-		}
+		if (b < 0x80)
+			len = 1;
+		else if ((b & 0xE0) == 0xC0)
+			len = 2;
+		else if ((b & 0xF0) == 0xE0)
+			len = 3;
+		else if ((b & 0xF8) == 0xF0)
+			len = 4;

-		spans.push_back(CodepointSpan { cp, start, start + length });
-		i += length;
+		if (i + len > text.size())
+			len = 1; // avoid overflow
+
+		u32 cp = utf8_rune_from_first(text.data() + i);
+		spans.push_back({ cp, i, i + len });
+		i += len;
 	}

 	return spans;
@@ -158,14 +143,25 @@ ImGui::ImGui(std::shared_ptr<TextRenderer> text_renderer)
 {
 }

-void ImGui::begin(u32 const rune, bool ctrl, bool shift)
+void ImGui::begin(u32 const rune, bool ctrl, bool shift,
+    std::string_view const clipboard,
+    std::function<void(std::string_view const &)> clipboard_set)
 {
 	m_rune = rune;
 	m_ctrl = ctrl;
 	m_shift = shift;
+	m_clipboard = clipboard;
+	m_clipboard_set = clipboard_set;
 }

-void ImGui::end() { }
+void ImGui::end()
+{
+	m_rune = false;
+	m_ctrl = false;
+	m_shift = false;
+	m_clipboard = {};
+	m_clipboard_set = nullptr;
+}

 void ImGui::set_font(FontHandle font) { m_font = font; }

@@ -289,6 +285,15 @@ void ImGui::ime_clear_preedit()
 	state.caret_timer = 0.0;
 }

+size_t utf8_length(std::string_view const &s)
+{
+	size_t count = 0;
+	for (unsigned char c : s)
+		if ((c & 0xC0) != 0x80) // continuation bytes
+			++count;
+	return count;
+}
+
 auto ImGui::text_input(usize id, std::pmr::string &str, Rectangle rec,
    TextInputOptions options) -> std::bitset<2>
 {
@@ -479,6 +484,26 @@ auto ImGui::text_input(usize id, std::pmr::string &str, Rectangle rec,
 				submitted = true;
 			}
 			break;
+		case 'v':
+			if (m_ctrl && !m_clipboard.empty()) {
+				if (!options.multiline) {
+					std::string clipboard_no_newlines;
+					for (auto const &ch : m_clipboard) {
+						if (ch == '\n' || ch == '\r')
+							continue;
+						clipboard_no_newlines.push_back(ch);
+					}
+					str.insert(caret_byte, clipboard_no_newlines);
+					state.current_rune_idx
+					    += utf8_length(clipboard_no_newlines);
+				} else {
+					str.insert(caret_byte, m_clipboard);
+					state.current_rune_idx += utf8_length(m_clipboard);
+				}
+				changed = true;
+				request_refresh = true;
+				break;
+			}
 		default:
 			if (m_rune >= 0x20) {
 				auto encoded { encode_utf8(m_rune) };
--- a/src/ImGui.hpp
+++ b/src/ImGui.hpp
@@ -38,7 +38,9 @@ struct ImGui {
 	ImGui(ImGui &&) = default;
 	auto operator=(ImGui &&) -> ImGui & = default;

-	void begin(u32 const rune, bool ctrl, bool shift);
+	void begin(u32 const rune, bool ctrl, bool shift,
+	    std::string_view const clipboard,
+	    std::function<void(std::string_view const &)> clipboard_set);
 	void end();

 	// Bit 0 -> Submitted
@@ -127,6 +129,8 @@ private:
 	u32 m_rune {}; // 1234 <-> hjkl arrow keys
 	bool m_ctrl {};
 	bool m_shift {};
+	std::string_view m_clipboard {};
+	std::function<void(std::string_view const &)> m_clipboard_set;

 	std::queue<Style> m_styles { { Style {} } };

@@ -136,10 +140,11 @@ private:

 struct ImGuiGuard {
 	ImGuiGuard(std::shared_ptr<ImGui> imgui, u32 const rune, bool const ctrl,
-	    bool const shift)
+	    bool const shift, std::string_view const clipboard,
+	    std::function<void(std::string_view const &)> clipboard_set)
 	    : m_imgui(imgui)
 	{
-		m_imgui->begin(rune, ctrl, shift);
+		m_imgui->begin(rune, ctrl, shift, clipboard, clipboard_set);
 	}
 	~ImGuiGuard() { m_imgui->end(); }

--- a/src/Tick.cpp
+++ b/src/Tick.cpp
@@ -45,7 +45,9 @@ auto App::tick() -> void
 			rune = m_kbd.typing.back();
 			m_kbd.typing.clear();
 		}
-		ImGuiGuard gui_scope(m_gui, rune, m_kbd.ctrl(), m_kbd.shift());
+		ImGuiGuard gui_scope(m_gui, rune, m_kbd.ctrl(), m_kbd.shift(),
+		    clipboard(),
+		    [this](std::string_view const &str) { clipboard(str); });

 		Rectangle const input_rect {
 			0.0f,
@@ -63,6 +65,4 @@ auto App::tick() -> void
 	EndDrawing();

 	eglSwapBuffers(m_gl.edpy, m_gl.esurf);
-	m_kbd.typing.clear();
-	m_kbd.clear_transients();
 }