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feat(wayland): text input through zwp_text_input_v3

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A window can now say that a text field has the focus and where its caret
is — Window::SetTextInput(active, caret rectangle in physical pixels,
purpose) — which is what opens the on-screen keyboard on a phone (Maliit
under KWin, squeekboard under phoc). What the input method produces comes
back as events: committed text as onTextInput, the composing text as
onPreedit (empty clears it), deletions around the cursor as
onTextInputDelete; done() applies them in the protocol's order. The state
a window wants is remembered and sent again whenever the keyboard focus
returns to it. The protocol's client code is generated with wayland-scanner
1.26.0 from wayland-protocols' text-input-unstable-v3.xml, under lib/ like
the others.
This commit is contained in:
Jorijn van der Graaf 2026-10-18 01:50:39 +02:00
commit 678f38964f
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
8 changed files with 1355 additions and 0 deletions
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14
interfaces/Crafter.Graphics-Window.cppm
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@ -13,6 +13,7 @@ module;
#include "../lib/wayland-xdg-decoration-unstable-v1-client-protocol.h"
#include "../lib/fractional-scale-v1.h"
#include "../lib/viewporter.h"
#include "../lib/text-input-unstable-v3-client-protocol.h"
#include <string.h>
#include <linux/input.h>
#include <sys/mman.h>
@ -106,6 +107,11 @@ export namespace Crafter {
Event<TouchPoint> onTouchUp;
Event<void> onTouchCancel;
std::int32_t primaryTouchId = -1;
// Text input (zwp_text_input_v3): the input method's composing text
// (an empty string clears it) and its deletions around the cursor;
// the text it commits arrives as onTextInput, like a key's.
Event<const std::string_view> onPreedit;
Event<TextDelete> onTextInputDelete;
Vector<float, 2> currentMousePos;
Vector<float, 2> lastMousePos;
Vector<float, 2> mouseDelta;
@ -151,6 +157,11 @@ export namespace Crafter {
void StartUpdate();
void StopUpdate();
void SetTitle(const std::string_view title);
// Tells the compositor's input method that a text field has focus
// (an on-screen keyboard opens) and where its caret is, in physical
// pixels, or that none has. Remembered: it is applied again whenever
// the keyboard focus comes back to this window.
void SetTextInput(bool active, std::int32_t x = 0, std::int32_t y = 0, std::int32_t width = 0, std::int32_t height = 0, TextInputPurpose purpose = TextInputPurpose::Normal);
void Resize(std::uint32_t width, std::uint32_t height);
void Render();
void Update();
@ -219,6 +230,9 @@ export namespace Crafter {
// Needed so `SetCursorImage` can re-issue `wl_pointer_set_cursor`
// mid-session (the hotspot only updates when set_cursor is recalled).
std::uint32_t lastPointerSerial_ = 0;
bool textInputActive_ = false;
std::int32_t textInputRect_[4] = { 0, 0, 0, 0 };
TextInputPurpose textInputPurpose_ = TextInputPurpose::Normal;
static void xdg_surface_handle_preferred_scale(void* data, wp_fractional_scale_v1*, std::uint32_t scale);
static void wl_surface_frame_done(void *data, wl_callback *cb, uint32_t time);