[Wayland] Implement IME support.

platform/linuxbsd/wayland/SCsub

@@ -151,6 +151,16 @@ env.WAYLAND_API_CODE(
     source="#thirdparty/wayland-protocols/unstable/tablet/tablet-unstable-v2.xml",
 )
 
+env.WAYLAND_API_HEADER(
+    target="protocol/text_input.gen.h",
+    source="#thirdparty/wayland-protocols/unstable/text-input/text-input-unstable-v3.xml",
+)
+
+env.WAYLAND_API_CODE(
+    target="protocol/text_input.gen.c",
+    source="#thirdparty/wayland-protocols/unstable/text-input/text-input-unstable-v3.xml",
+)
+
 env.WAYLAND_API_HEADER(
     target="protocol/xdg_foreign.gen.h",
     source="#thirdparty/wayland-protocols/unstable/xdg-foreign/xdg-foreign-unstable-v1.xml",
@@ -175,6 +185,7 @@ source_files = [
     "protocol/primary_selection.gen.c",
     "protocol/idle_inhibit.gen.c",
     "protocol/tablet.gen.c",
+    "protocol/text_input.gen.c",
     "display_server_wayland.cpp",
     "wayland_thread.cpp",
     "key_mapping_xkb.cpp",

platform/linuxbsd/wayland/display_server_wayland.cpp

@@ -208,6 +208,7 @@ bool DisplayServerWayland::has_feature(Feature p_feature) const {
 		case FEATURE_HIDPI:
 		case FEATURE_SWAP_BUFFERS:
 		case FEATURE_KEEP_SCREEN_ON:
+		case FEATURE_IME:
 		case FEATURE_CLIPBOARD_PRIMARY: {
 			return true;
 		} break;
@@ -903,13 +904,23 @@ bool DisplayServerWayland::can_any_window_draw() const {
 }
 
 void DisplayServerWayland::window_set_ime_active(const bool p_active, DisplayServer::WindowID p_window_id) {
-	// TODO
-	DEBUG_LOG_WAYLAND(vformat("wayland stub window_set_ime_active active %s", p_active ? "true" : "false"));
+	MutexLock mutex_lock(wayland_thread.mutex);
+
+	wayland_thread.window_set_ime_active(p_active, MAIN_WINDOW_ID);
 }
 
 void DisplayServerWayland::window_set_ime_position(const Point2i &p_pos, DisplayServer::WindowID p_window_id) {
-	// TODO
-	DEBUG_LOG_WAYLAND(vformat("wayland stub window_set_ime_position pos %s window %d", p_pos, p_window_id));
+	MutexLock mutex_lock(wayland_thread.mutex);
+
+	wayland_thread.window_set_ime_position(p_pos, MAIN_WINDOW_ID);
+}
+
+Point2i DisplayServerWayland::ime_get_selection() const {
+	return ime_selection;
+}
+
+String DisplayServerWayland::ime_get_text() const {
+	return ime_text;
 }
 
 // NOTE: While Wayland is supposed to be tear-free, wayland-protocols version
@@ -1146,6 +1157,37 @@ void DisplayServerWayland::process_events() {
 				}
 			}
 		}
+
+		Ref<WaylandThread::IMECommitEventMessage> ime_commit_msg = msg;
+		if (ime_commit_msg.is_valid()) {
+			for (int i = 0; i < ime_commit_msg->text.length(); i++) {
+				const char32_t codepoint = ime_commit_msg->text[i];
+
+				Ref<InputEventKey> ke;
+				ke.instantiate();
+				ke->set_window_id(MAIN_WINDOW_ID);
+				ke->set_pressed(true);
+				ke->set_echo(false);
+				ke->set_keycode(Key::NONE);
+				ke->set_physical_keycode(Key::NONE);
+				ke->set_key_label(Key::NONE);
+				ke->set_unicode(codepoint);
+
+				Input::get_singleton()->parse_input_event(ke);
+			}
+			ime_text = String();
+			ime_selection = Vector2i();
+
+			OS::get_singleton()->get_main_loop()->notification(MainLoop::NOTIFICATION_OS_IME_UPDATE);
+		}
+
+		Ref<WaylandThread::IMEUpdateEventMessage> ime_update_msg = msg;
+		if (ime_update_msg.is_valid()) {
+			ime_text = ime_update_msg->text;
+			ime_selection = ime_update_msg->selection;
+
+			OS::get_singleton()->get_main_loop()->notification(MainLoop::NOTIFICATION_OS_IME_UPDATE);
+		}
 	}
 
 	wayland_thread.keyboard_echo_keys();

platform/linuxbsd/wayland/display_server_wayland.h

@@ -115,6 +115,9 @@ class DisplayServerWayland : public DisplayServer {
 
 	Context context;
 
+	String ime_text;
+	Vector2i ime_selection;
+
 	bool suspended = false;
 	bool emulate_vsync = false;
 
@@ -259,6 +262,9 @@ public:
 	virtual void window_set_ime_active(const bool p_active, WindowID p_window_id = MAIN_WINDOW_ID) override;
 	virtual void window_set_ime_position(const Point2i &p_pos, WindowID p_window_id = MAIN_WINDOW_ID) override;
 
+	virtual Point2i ime_get_selection() const override;
+	virtual String ime_get_text() const override;
+
 	virtual void window_set_vsync_mode(DisplayServer::VSyncMode p_vsync_mode, WindowID p_window_id = MAIN_WINDOW_ID) override;
 	virtual DisplayServer::VSyncMode window_get_vsync_mode(WindowID p_window_id) const override;
 

platform/linuxbsd/wayland/wayland_thread.cpp

@@ -448,6 +448,12 @@ void WaylandThread::_wl_registry_on_global(void *data, struct wl_registry *wl_re
 			zwp_tablet_seat_v2_add_listener(ss->wp_tablet_seat, &wp_tablet_seat_listener, ss);
 		}
 
+		if (!ss->wp_text_input && registry->wp_text_input_manager) {
+			// IME.
+			ss->wp_text_input = zwp_text_input_manager_v3_get_text_input(registry->wp_text_input_manager, wl_seat);
+			zwp_text_input_v3_add_listener(ss->wp_text_input, &wp_text_input_listener, ss);
+		}
+
 		registry->wl_seats.push_back(wl_seat);
 
 		wl_seat_add_listener(wl_seat, &wl_seat_listener, ss);
@@ -547,6 +553,22 @@ void WaylandThread::_wl_registry_on_global(void *data, struct wl_registry *wl_re
 
 		return;
 	}
+
+	if (strcmp(interface, zwp_text_input_manager_v3_interface.name) == 0) {
+		registry->wp_text_input_manager = (struct zwp_text_input_manager_v3 *)wl_registry_bind(wl_registry, name, &zwp_text_input_manager_v3_interface, 1);
+		registry->wp_text_input_manager_name = name;
+
+		// This global creates some seat data. Let's do that for the ones already available.
+		for (struct wl_seat *wl_seat : registry->wl_seats) {
+			SeatState *ss = wl_seat_get_seat_state(wl_seat);
+			ERR_FAIL_NULL(ss);
+
+			ss->wp_text_input = zwp_text_input_manager_v3_get_text_input(registry->wp_text_input_manager, wl_seat);
+			zwp_text_input_v3_add_listener(ss->wp_text_input, &wp_text_input_listener, ss);
+		}
+
+		return;
+	}
 }
 
 void WaylandThread::_wl_registry_on_global_remove(void *data, struct wl_registry *wl_registry, uint32_t name) {
@@ -825,6 +847,25 @@ void WaylandThread::_wl_registry_on_global_remove(void *data, struct wl_registry
 		return;
 	}
 
+	if (name == registry->wp_text_input_manager_name) {
+		if (registry->wp_text_input_manager) {
+			zwp_text_input_manager_v3_destroy(registry->wp_text_input_manager);
+			registry->wp_text_input_manager = nullptr;
+		}
+
+		registry->wp_text_input_manager_name = 0;
+
+		for (struct wl_seat *wl_seat : registry->wl_seats) {
+			SeatState *ss = wl_seat_get_seat_state(wl_seat);
+			ERR_FAIL_NULL(ss);
+
+			zwp_text_input_v3_destroy(ss->wp_text_input);
+			ss->wp_text_input = nullptr;
+		}
+
+		return;
+	}
+
 	{
 		// Iterate through all of the seats to find if any got removed.
 		List<struct wl_seat *>::Element *E = registry->wl_seats.front();
@@ -2535,6 +2576,118 @@ void WaylandThread::_wp_tablet_tool_on_frame(void *data, struct zwp_tablet_tool_
 	old_td = td;
 }
 
+void WaylandThread::_wp_text_input_on_enter(void *data, struct zwp_text_input_v3 *wp_text_input_v3, struct wl_surface *surface) {
+	SeatState *ss = (SeatState *)data;
+	if (!ss) {
+		return;
+	}
+
+	ss->ime_enabled = true;
+}
+
+void WaylandThread::_wp_text_input_on_leave(void *data, struct zwp_text_input_v3 *wp_text_input_v3, struct wl_surface *surface) {
+	SeatState *ss = (SeatState *)data;
+	if (!ss) {
+		return;
+	}
+
+	ss->ime_enabled = false;
+	ss->ime_active = false;
+	ss->ime_text = String();
+	ss->ime_text_commit = String();
+	ss->ime_cursor = Vector2i();
+
+	Ref<IMEUpdateEventMessage> msg;
+	msg.instantiate();
+	msg->text = String();
+	msg->selection = Vector2i();
+	ss->wayland_thread->push_message(msg);
+}
+
+void WaylandThread::_wp_text_input_on_preedit_string(void *data, struct zwp_text_input_v3 *wp_text_input_v3, const char *text, int32_t cursor_begin, int32_t cursor_end) {
+	SeatState *ss = (SeatState *)data;
+	if (!ss) {
+		return;
+	}
+
+	ss->ime_text = String::utf8(text);
+
+	// Convert cursor positions from UTF-8 to UTF-32 offset.
+	int32_t cursor_begin_utf32 = 0;
+	int32_t cursor_end_utf32 = 0;
+	for (int i = 0; i < ss->ime_text.length(); i++) {
+		uint32_t c = ss->ime_text[i];
+		if (c <= 0x7f) { // 7 bits.
+			cursor_begin -= 1;
+			cursor_end -= 1;
+		} else if (c <= 0x7ff) { // 11 bits
+			cursor_begin -= 2;
+			cursor_end -= 2;
+		} else if (c <= 0xffff) { // 16 bits
+			cursor_begin -= 3;
+			cursor_end -= 3;
+		} else if (c <= 0x001fffff) { // 21 bits
+			cursor_begin -= 4;
+			cursor_end -= 4;
+		} else if (c <= 0x03ffffff) { // 26 bits
+			cursor_begin -= 5;
+			cursor_end -= 5;
+		} else if (c <= 0x7fffffff) { // 31 bits
+			cursor_begin -= 6;
+			cursor_end -= 6;
+		} else {
+			cursor_begin -= 1;
+			cursor_end -= 1;
+		}
+		if (cursor_begin == 0) {
+			cursor_begin_utf32 = i + 1;
+		}
+		if (cursor_end == 0) {
+			cursor_end_utf32 = i + 1;
+		}
+		if (cursor_begin <= 0 && cursor_end <= 0) {
+			break;
+		}
+	}
+	ss->ime_cursor = Vector2i(cursor_begin_utf32, cursor_end_utf32 - cursor_begin_utf32);
+}
+
+void WaylandThread::_wp_text_input_on_commit_string(void *data, struct zwp_text_input_v3 *wp_text_input_v3, const char *text) {
+	SeatState *ss = (SeatState *)data;
+	if (!ss) {
+		return;
+	}
+
+	ss->ime_text_commit = String::utf8(text);
+}
+
+void WaylandThread::_wp_text_input_on_delete_surrounding_text(void *data, struct zwp_text_input_v3 *wp_text_input_v3, uint32_t before_length, uint32_t after_length) {
+	// Not implemented.
+}
+
+void WaylandThread::_wp_text_input_on_done(void *data, struct zwp_text_input_v3 *wp_text_input_v3, uint32_t serial) {
+	SeatState *ss = (SeatState *)data;
+	if (!ss) {
+		return;
+	}
+
+	if (!ss->ime_text_commit.is_empty()) {
+		Ref<IMECommitEventMessage> msg;
+		msg.instantiate();
+		msg->text = ss->ime_text_commit;
+		ss->wayland_thread->push_message(msg);
+	} else if (!ss->ime_text.is_empty()) {
+		Ref<IMEUpdateEventMessage> msg;
+		msg.instantiate();
+		msg->text = ss->ime_text;
+		msg->selection = ss->ime_cursor;
+		ss->wayland_thread->push_message(msg);
+	}
+	ss->ime_text = String();
+	ss->ime_text_commit = String();
+	ss->ime_cursor = Vector2i();
+}
+
 void WaylandThread::_xdg_activation_token_on_done(void *data, struct xdg_activation_token_v1 *xdg_activation_token, const char *token) {
 	WindowState *ws = (WindowState *)data;
 	ERR_FAIL_NULL(ws);
@@ -3729,6 +3882,35 @@ void WaylandThread::cursor_shape_clear_custom_image(DisplayServer::CursorShape p
 	}
 }
 
+void WaylandThread::window_set_ime_active(const bool p_active, DisplayServer::WindowID p_window_id) {
+	SeatState *ss = wl_seat_get_seat_state(wl_seat_current);
+
+	if (ss && ss->wp_text_input && ss->ime_enabled) {
+		if (p_active) {
+			ss->ime_active = true;
+			zwp_text_input_v3_enable(ss->wp_text_input);
+			zwp_text_input_v3_set_cursor_rectangle(ss->wp_text_input, ss->ime_rect.position.x, ss->ime_rect.position.y, ss->ime_rect.size.x, ss->ime_rect.size.y);
+		} else {
+			ss->ime_active = false;
+			ss->ime_text = String();
+			ss->ime_text_commit = String();
+			ss->ime_cursor = Vector2i();
+			zwp_text_input_v3_disable(ss->wp_text_input);
+		}
+		zwp_text_input_v3_commit(ss->wp_text_input);
+	}
+}
+
+void WaylandThread::window_set_ime_position(const Point2i &p_pos, DisplayServer::WindowID p_window_id) {
+	SeatState *ss = wl_seat_get_seat_state(wl_seat_current);
+
+	if (ss && ss->wp_text_input && ss->ime_enabled) {
+		ss->ime_rect = Rect2i(p_pos, Size2i(1, 10));
+		zwp_text_input_v3_set_cursor_rectangle(ss->wp_text_input, ss->ime_rect.position.x, ss->ime_rect.position.y, ss->ime_rect.size.x, ss->ime_rect.size.y);
+		zwp_text_input_v3_commit(ss->wp_text_input);
+	}
+}
+
 int WaylandThread::keyboard_get_layout_count() const {
 	SeatState *ss = wl_seat_get_seat_state(wl_seat_current);
 

platform/linuxbsd/wayland/wayland_thread.h

@@ -62,6 +62,7 @@
 #undef pointer
 #include "wayland/protocol/fractional_scale.gen.h"
 #include "wayland/protocol/tablet.gen.h"
+#include "wayland/protocol/text_input.gen.h"
 #include "wayland/protocol/viewporter.gen.h"
 #include "wayland/protocol/wayland.gen.h"
 #include "wayland/protocol/xdg_activation.gen.h"
@@ -112,6 +113,17 @@ public:
 		Vector<String> files;
 	};
 
+	class IMEUpdateEventMessage : public Message {
+	public:
+		String text;
+		Vector2i selection;
+	};
+
+	class IMECommitEventMessage : public Message {
+	public:
+		String text;
+	};
+
 	struct RegistryState {
 		WaylandThread *wayland_thread;
 
@@ -170,6 +182,9 @@ public:
 
 		struct zwp_tablet_manager_v2 *wp_tablet_manager = nullptr;
 		uint32_t wp_tablet_manager_name = 0;
+
+		struct zwp_text_input_manager_v3 *wp_text_input_manager = nullptr;
+		uint32_t wp_text_input_manager_name = 0;
 	};
 
 	// General Wayland-specific states. Shouldn't be accessed directly.
@@ -438,6 +453,15 @@ public:
 		struct zwp_tablet_seat_v2 *wp_tablet_seat = nullptr;
 
 		List<struct zwp_tablet_tool_v2 *> tablet_tools;
+
+		// IME.
+		struct zwp_text_input_v3 *wp_text_input = nullptr;
+		bool ime_enabled = false;
+		bool ime_active = false;
+		String ime_text;
+		String ime_text_commit;
+		Vector2i ime_cursor;
+		Rect2i ime_rect;
 	};
 
 	struct CustomCursor {
@@ -618,6 +642,13 @@ private:
 	static void _wp_tablet_tool_on_button(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2, uint32_t serial, uint32_t button, uint32_t state);
 	static void _wp_tablet_tool_on_frame(void *data, struct zwp_tablet_tool_v2 *wp_tablet_tool_v2, uint32_t time);
 
+	static void _wp_text_input_on_enter(void *data, struct zwp_text_input_v3 *wp_text_input_v3, struct wl_surface *surface);
+	static void _wp_text_input_on_leave(void *data, struct zwp_text_input_v3 *wp_text_input_v3, struct wl_surface *surface);
+	static void _wp_text_input_on_preedit_string(void *data, struct zwp_text_input_v3 *wp_text_input_v3, const char *text, int32_t cursor_begin, int32_t cursor_end);
+	static void _wp_text_input_on_commit_string(void *data, struct zwp_text_input_v3 *wp_text_input_v3, const char *text);
+	static void _wp_text_input_on_delete_surrounding_text(void *data, struct zwp_text_input_v3 *wp_text_input_v3, uint32_t before_length, uint32_t after_length);
+	static void _wp_text_input_on_done(void *data, struct zwp_text_input_v3 *wp_text_input_v3, uint32_t serial);
+
 	static void _xdg_toplevel_decoration_on_configure(void *data, struct zxdg_toplevel_decoration_v1 *xdg_toplevel_decoration, uint32_t mode);
 
 	static void _xdg_exported_on_exported(void *data, zxdg_exported_v1 *exported, const char *handle);
@@ -779,6 +810,15 @@ private:
 		.frame = _wp_tablet_tool_on_frame,
 	};
 
+	static constexpr struct zwp_text_input_v3_listener wp_text_input_listener = {
+		.enter = _wp_text_input_on_enter,
+		.leave = _wp_text_input_on_leave,
+		.preedit_string = _wp_text_input_on_preedit_string,
+		.commit_string = _wp_text_input_on_commit_string,
+		.delete_surrounding_text = _wp_text_input_on_delete_surrounding_text,
+		.done = _wp_text_input_on_done,
+	};
+
 	static constexpr struct zxdg_exported_v1_listener xdg_exported_listener = {
 		.handle = _xdg_exported_on_exported
 	};
@@ -929,6 +969,9 @@ public:
 	void cursor_shape_set_custom_image(DisplayServer::CursorShape p_cursor_shape, Ref<Image> p_image, const Point2i &p_hotspot);
 	void cursor_shape_clear_custom_image(DisplayServer::CursorShape p_cursor_shape);
 
+	void window_set_ime_active(const bool p_active, DisplayServer::WindowID p_window_id);
+	void window_set_ime_position(const Point2i &p_pos, DisplayServer::WindowID p_window_id);
+
 	int keyboard_get_layout_count() const;
 	int keyboard_get_current_layout_index() const;
 	void keyboard_set_current_layout_index(int p_index);

thirdparty/README.md

@@ -1004,6 +1004,8 @@ Files extracted from upstream source:
 - `unstable/relative-pointer/relative-pointer-unstable-v1.xml`
 - `unstable/tablet/README`
 - `unstable/tablet/tablet-unstable-v2.xml`
+- `unstable/text-input/README`
+- `unstable/text-input/text-input-unstable-v3.xml`
 - `unstable/xdg-decoration/README`
 - `unstable/xdg-decoration/xdg-decoration-unstable-v1.xml`
 - `unstable/xdg-foreign/README`

thirdparty/wayland-protocols/unstable/text-input/README

@@ -0,0 +1,4 @@
+Text input protocol
+
+Maintainers:
+Jan Arne Petersen <janarne@gmail.com>

thirdparty/wayland-protocols/unstable/text-input/text-input-unstable-v3.xml

@@ -0,0 +1,457 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<protocol name="text_input_unstable_v3">
+  <copyright>
+    Copyright © 2012, 2013 Intel Corporation
+    Copyright © 2015, 2016 Jan Arne Petersen
+    Copyright © 2017, 2018 Red Hat, Inc.
+    Copyright © 2018       Purism SPC
+
+    Permission to use, copy, modify, distribute, and sell this
+    software and its documentation for any purpose is hereby granted
+    without fee, provided that the above copyright notice appear in
+    all copies and that both that copyright notice and this permission
+    notice appear in supporting documentation, and that the name of
+    the copyright holders not be used in advertising or publicity
+    pertaining to distribution of the software without specific,
+    written prior permission.  The copyright holders make no
+    representations about the suitability of this software for any
+    purpose.  It is provided "as is" without express or implied
+    warranty.
+
+    THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+    SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+    FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+    THIS SOFTWARE.
+  </copyright>
+
+  <description summary="Protocol for composing text">
+    This protocol allows compositors to act as input methods and to send text
+    to applications. A text input object is used to manage state of what are
+    typically text entry fields in the application.
+
+    This document adheres to the RFC 2119 when using words like "must",
+    "should", "may", etc.
+
+    Warning! The protocol described in this file is experimental and
+    backward incompatible changes may be made. Backward compatible changes
+    may be added together with the corresponding interface version bump.
+    Backward incompatible changes are done by bumping the version number in
+    the protocol and interface names and resetting the interface version.
+    Once the protocol is to be declared stable, the 'z' prefix and the
+    version number in the protocol and interface names are removed and the
+    interface version number is reset.
+  </description>
+
+  <interface name="zwp_text_input_v3" version="1">
+    <description summary="text input">
+      The zwp_text_input_v3 interface represents text input and input methods
+      associated with a seat. It provides enter/leave events to follow the
+      text input focus for a seat.
+
+      Requests are used to enable/disable the text-input object and set
+      state information like surrounding and selected text or the content type.
+      The information about the entered text is sent to the text-input object
+      via the preedit_string and commit_string events.
+
+      Text is valid UTF-8 encoded, indices and lengths are in bytes. Indices
+      must not point to middle bytes inside a code point: they must either
+      point to the first byte of a code point or to the end of the buffer.
+      Lengths must be measured between two valid indices.
+
+      Focus moving throughout surfaces will result in the emission of
+      zwp_text_input_v3.enter and zwp_text_input_v3.leave events. The focused
+      surface must commit zwp_text_input_v3.enable and
+      zwp_text_input_v3.disable requests as the keyboard focus moves across
+      editable and non-editable elements of the UI. Those two requests are not
+      expected to be paired with each other, the compositor must be able to
+      handle consecutive series of the same request.
+
+      State is sent by the state requests (set_surrounding_text,
+      set_content_type and set_cursor_rectangle) and a commit request. After an
+      enter event or disable request all state information is invalidated and
+      needs to be resent by the client.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="Destroy the wp_text_input">
+        Destroy the wp_text_input object. Also disables all surfaces enabled
+        through this wp_text_input object.
+      </description>
+    </request>
+
+    <request name="enable">
+      <description summary="Request text input to be enabled">
+        Requests text input on the surface previously obtained from the enter
+        event.
+
+        This request must be issued every time the active text input changes
+        to a new one, including within the current surface. Use
+        zwp_text_input_v3.disable when there is no longer any input focus on
+        the current surface.
+
+        Clients must not enable more than one text input on the single seat
+        and should disable the current text input before enabling the new one.
+        At most one instance of text input may be in enabled state per instance,
+        Requests to enable the another text input when some text input is active
+        must be ignored by compositor.
+
+        This request resets all state associated with previous enable, disable,
+        set_surrounding_text, set_text_change_cause, set_content_type, and
+        set_cursor_rectangle requests, as well as the state associated with
+        preedit_string, commit_string, and delete_surrounding_text events.
+
+        The set_surrounding_text, set_content_type and set_cursor_rectangle
+        requests must follow if the text input supports the necessary
+        functionality.
+
+        State set with this request is double-buffered. It will get applied on
+        the next zwp_text_input_v3.commit request, and stay valid until the
+        next committed enable or disable request.
+
+        The changes must be applied by the compositor after issuing a
+        zwp_text_input_v3.commit request.
+      </description>
+    </request>
+
+    <request name="disable">
+      <description summary="Disable text input on a surface">
+        Explicitly disable text input on the current surface (typically when
+        there is no focus on any text entry inside the surface).
+
+        State set with this request is double-buffered. It will get applied on
+        the next zwp_text_input_v3.commit request.
+      </description>
+    </request>
+
+    <request name="set_surrounding_text">
+      <description summary="sets the surrounding text">
+        Sets the surrounding plain text around the input, excluding the preedit
+        text.
+
+        The client should notify the compositor of any changes in any of the
+        values carried with this request, including changes caused by handling
+        incoming text-input events as well as changes caused by other
+        mechanisms like keyboard typing.
+
+        If the client is unaware of the text around the cursor, it should not
+        issue this request, to signify lack of support to the compositor.
+
+        Text is UTF-8 encoded, and should include the cursor position, the
+        complete selection and additional characters before and after them.
+        There is a maximum length of wayland messages, so text can not be
+        longer than 4000 bytes.
+
+        Cursor is the byte offset of the cursor within text buffer.
+
+        Anchor is the byte offset of the selection anchor within text buffer.
+        If there is no selected text, anchor is the same as cursor.
+
+        If any preedit text is present, it is replaced with a cursor for the
+        purpose of this event.
+
+        Values set with this request are double-buffered. They will get applied
+        on the next zwp_text_input_v3.commit request, and stay valid until the
+        next committed enable or disable request.
+
+        The initial state for affected fields is empty, meaning that the text
+        input does not support sending surrounding text. If the empty values
+        get applied, subsequent attempts to change them may have no effect.
+      </description>
+      <arg name="text" type="string"/>
+      <arg name="cursor" type="int"/>
+      <arg name="anchor" type="int"/>
+    </request>
+
+    <enum name="change_cause">
+      <description summary="text change reason">
+        Reason for the change of surrounding text or cursor posision.
+      </description>
+      <entry name="input_method" value="0" summary="input method caused the change"/>
+      <entry name="other" value="1" summary="something else than the input method caused the change"/>
+    </enum>
+
+    <request name="set_text_change_cause">
+      <description summary="indicates the cause of surrounding text change">
+        Tells the compositor why the text surrounding the cursor changed.
+
+        Whenever the client detects an external change in text, cursor, or
+        anchor posision, it must issue this request to the compositor. This
+        request is intended to give the input method a chance to update the
+        preedit text in an appropriate way, e.g. by removing it when the user
+        starts typing with a keyboard.
+
+        cause describes the source of the change.
+
+        The value set with this request is double-buffered. It must be applied
+        and reset to initial at the next zwp_text_input_v3.commit request.
+
+        The initial value of cause is input_method.
+      </description>
+      <arg name="cause" type="uint" enum="change_cause"/>
+    </request>
+
+    <enum name="content_hint" bitfield="true">
+      <description summary="content hint">
+        Content hint is a bitmask to allow to modify the behavior of the text
+        input.
+      </description>
+      <entry name="none" value="0x0" summary="no special behavior"/>
+      <entry name="completion" value="0x1" summary="suggest word completions"/>
+      <entry name="spellcheck" value="0x2" summary="suggest word corrections"/>
+      <entry name="auto_capitalization" value="0x4" summary="switch to uppercase letters at the start of a sentence"/>
+      <entry name="lowercase" value="0x8" summary="prefer lowercase letters"/>
+      <entry name="uppercase" value="0x10" summary="prefer uppercase letters"/>
+      <entry name="titlecase" value="0x20" summary="prefer casing for titles and headings (can be language dependent)"/>
+      <entry name="hidden_text" value="0x40" summary="characters should be hidden"/>
+      <entry name="sensitive_data" value="0x80" summary="typed text should not be stored"/>
+      <entry name="latin" value="0x100" summary="just Latin characters should be entered"/>
+      <entry name="multiline" value="0x200" summary="the text input is multiline"/>
+    </enum>
+
+    <enum name="content_purpose">
+      <description summary="content purpose">
+        The content purpose allows to specify the primary purpose of a text
+        input.
+
+        This allows an input method to show special purpose input panels with
+        extra characters or to disallow some characters.
+      </description>
+      <entry name="normal" value="0" summary="default input, allowing all characters"/>
+      <entry name="alpha" value="1" summary="allow only alphabetic characters"/>
+      <entry name="digits" value="2" summary="allow only digits"/>
+      <entry name="number" value="3" summary="input a number (including decimal separator and sign)"/>
+      <entry name="phone" value="4" summary="input a phone number"/>
+      <entry name="url" value="5" summary="input an URL"/>
+      <entry name="email" value="6" summary="input an email address"/>
+      <entry name="name" value="7" summary="input a name of a person"/>
+      <entry name="password" value="8" summary="input a password (combine with sensitive_data hint)"/>
+      <entry name="pin" value="9" summary="input is a numeric password (combine with sensitive_data hint)"/>
+      <entry name="date" value="10" summary="input a date"/>
+      <entry name="time" value="11" summary="input a time"/>
+      <entry name="datetime" value="12" summary="input a date and time"/>
+      <entry name="terminal" value="13" summary="input for a terminal"/>
+    </enum>
+
+    <request name="set_content_type">
+      <description summary="set content purpose and hint">
+        Sets the content purpose and content hint. While the purpose is the
+        basic purpose of an input field, the hint flags allow to modify some of
+        the behavior.
+
+        Values set with this request are double-buffered. They will get applied
+        on the next zwp_text_input_v3.commit request.
+        Subsequent attempts to update them may have no effect. The values
+        remain valid until the next committed enable or disable request.
+
+        The initial value for hint is none, and the initial value for purpose
+        is normal.
+      </description>
+      <arg name="hint" type="uint" enum="content_hint"/>
+      <arg name="purpose" type="uint" enum="content_purpose"/>
+    </request>
+
+    <request name="set_cursor_rectangle">
+      <description summary="set cursor position">
+        Marks an area around the cursor as a x, y, width, height rectangle in
+        surface local coordinates.
+
+        Allows the compositor to put a window with word suggestions near the
+        cursor, without obstructing the text being input.
+
+        If the client is unaware of the position of edited text, it should not
+        issue this request, to signify lack of support to the compositor.
+
+        Values set with this request are double-buffered. They will get applied
+        on the next zwp_text_input_v3.commit request, and stay valid until the
+        next committed enable or disable request.
+
+        The initial values describing a cursor rectangle are empty. That means
+        the text input does not support describing the cursor area. If the
+        empty values get applied, subsequent attempts to change them may have
+        no effect.
+      </description>
+      <arg name="x" type="int"/>
+      <arg name="y" type="int"/>
+      <arg name="width" type="int"/>
+      <arg name="height" type="int"/>
+    </request>
+
+    <request name="commit">
+      <description summary="commit state">
+        Atomically applies state changes recently sent to the compositor.
+
+        The commit request establishes and updates the state of the client, and
+        must be issued after any changes to apply them.
+
+        Text input state (enabled status, content purpose, content hint,
+        surrounding text and change cause, cursor rectangle) is conceptually
+        double-buffered within the context of a text input, i.e. between a
+        committed enable request and the following committed enable or disable
+        request.
+
+        Protocol requests modify the pending state, as opposed to the current
+        state in use by the input method. A commit request atomically applies
+        all pending state, replacing the current state. After commit, the new
+        pending state is as documented for each related request.
+
+        Requests are applied in the order of arrival.
+
+        Neither current nor pending state are modified unless noted otherwise.
+
+        The compositor must count the number of commit requests coming from
+        each zwp_text_input_v3 object and use the count as the serial in done
+        events.
+      </description>
+    </request>
+
+    <event name="enter">
+      <description summary="enter event">
+        Notification that this seat's text-input focus is on a certain surface.
+
+        If client has created multiple text input objects, compositor must send
+        this event to all of them.
+
+        When the seat has the keyboard capability the text-input focus follows
+        the keyboard focus. This event sets the current surface for the
+        text-input object.
+      </description>
+      <arg name="surface" type="object" interface="wl_surface"/>
+    </event>
+
+    <event name="leave">
+      <description summary="leave event">
+        Notification that this seat's text-input focus is no longer on a
+        certain surface. The client should reset any preedit string previously
+        set.
+
+        The leave notification clears the current surface. It is sent before
+        the enter notification for the new focus. After leave event, compositor
+        must ignore requests from any text input instances until next enter
+        event.
+
+        When the seat has the keyboard capability the text-input focus follows
+        the keyboard focus.
+      </description>
+      <arg name="surface" type="object" interface="wl_surface"/>
+    </event>
+
+    <event name="preedit_string">
+      <description summary="pre-edit">
+        Notify when a new composing text (pre-edit) should be set at the
+        current cursor position. Any previously set composing text must be
+        removed. Any previously existing selected text must be removed.
+
+        The argument text contains the pre-edit string buffer.
+
+        The parameters cursor_begin and cursor_end are counted in bytes
+        relative to the beginning of the submitted text buffer. Cursor should
+        be hidden when both are equal to -1.
+
+        They could be represented by the client as a line if both values are
+        the same, or as a text highlight otherwise.
+
+        Values set with this event are double-buffered. They must be applied
+        and reset to initial on the next zwp_text_input_v3.done event.
+
+        The initial value of text is an empty string, and cursor_begin,
+        cursor_end and cursor_hidden are all 0.
+      </description>
+      <arg name="text" type="string" allow-null="true"/>
+      <arg name="cursor_begin" type="int"/>
+      <arg name="cursor_end" type="int"/>
+    </event>
+
+    <event name="commit_string">
+      <description summary="text commit">
+        Notify when text should be inserted into the editor widget. The text to
+        commit could be either just a single character after a key press or the
+        result of some composing (pre-edit).
+
+        Values set with this event are double-buffered. They must be applied
+        and reset to initial on the next zwp_text_input_v3.done event.
+
+        The initial value of text is an empty string.
+      </description>
+      <arg name="text" type="string" allow-null="true"/>
+    </event>
+
+    <event name="delete_surrounding_text">
+      <description summary="delete surrounding text">
+        Notify when the text around the current cursor position should be
+        deleted.
+
+        Before_length and after_length are the number of bytes before and after
+        the current cursor index (excluding the selection) to delete.
+
+        If a preedit text is present, in effect before_length is counted from
+        the beginning of it, and after_length from its end (see done event
+        sequence).
+
+        Values set with this event are double-buffered. They must be applied
+        and reset to initial on the next zwp_text_input_v3.done event.
+
+        The initial values of both before_length and after_length are 0.
+      </description>
+      <arg name="before_length" type="uint" summary="length of text before current cursor position"/>
+      <arg name="after_length" type="uint" summary="length of text after current cursor position"/>
+    </event>
+
+    <event name="done">
+      <description summary="apply changes">
+        Instruct the application to apply changes to state requested by the
+        preedit_string, commit_string and delete_surrounding_text events. The
+        state relating to these events is double-buffered, and each one
+        modifies the pending state. This event replaces the current state with
+        the pending state.
+
+        The application must proceed by evaluating the changes in the following
+        order:
+
+        1. Replace existing preedit string with the cursor.
+        2. Delete requested surrounding text.
+        3. Insert commit string with the cursor at its end.
+        4. Calculate surrounding text to send.
+        5. Insert new preedit text in cursor position.
+        6. Place cursor inside preedit text.
+
+        The serial number reflects the last state of the zwp_text_input_v3
+        object known to the compositor. The value of the serial argument must
+        be equal to the number of commit requests already issued on that object.
+
+        When the client receives a done event with a serial different than the
+        number of past commit requests, it must proceed with evaluating and
+        applying the changes as normal, except it should not change the current
+        state of the zwp_text_input_v3 object. All pending state requests
+        (set_surrounding_text, set_content_type and set_cursor_rectangle) on
+        the zwp_text_input_v3 object should be sent and committed after
+        receiving a zwp_text_input_v3.done event with a matching serial.
+      </description>
+      <arg name="serial" type="uint"/>
+    </event>
+  </interface>
+
+  <interface name="zwp_text_input_manager_v3" version="1">
+    <description summary="text input manager">
+      A factory for text-input objects. This object is a global singleton.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="Destroy the wp_text_input_manager">
+        Destroy the wp_text_input_manager object.
+      </description>
+    </request>
+
+    <request name="get_text_input">
+      <description summary="create a new text input object">
+        Creates a new text-input object for a given seat.
+      </description>
+      <arg name="id" type="new_id" interface="zwp_text_input_v3"/>
+      <arg name="seat" type="object" interface="wl_seat"/>
+    </request>
+  </interface>
+</protocol>