input: Rewritten pointer constraints (#4889)

* rewritten constraints

* send pointer enter on activate if not pointer focus

* minor cleanup

* simulate movement on commit

* don't ignore oneshot prop

* various fixes

* dont send motion on confined

* update pos hint on region change

1 files changed, 121 insertions, 0 deletions

diff --git a/src/desktop/Constraint.cpp b/src/desktop/Constraint.cpp
new file mode 100644
index 00000000..ea89037f
--- /dev/null
+++ b/src/desktop/Constraint.cpp
@@ -0,0 +1,121 @@
+#include "Constraint.hpp"
+#include "WLSurface.hpp"
+#include "../Compositor.hpp"
+
+CConstraint::CConstraint(wlr_pointer_constraint_v1* constraint, CWLSurface* owner) : m_pOwner(owner), m_pConstraint(constraint) {
+    initSignals();
+
+    m_vCursorPosOnActivate = g_pInputManager->getMouseCoordsInternal();
+
+    g_pInputManager->m_vConstraints.push_back(this);
+
+    if (g_pCompositor->m_pLastFocus == m_pOwner->wlr())
+        activate();
+}
+
+CConstraint::~CConstraint() {
+    std::erase(g_pInputManager->m_vConstraints, this);
+}
+
+static void onConstraintDestroy(void* owner, void* data) {
+    const auto CONSTRAINT = (CConstraint*)owner;
+    CONSTRAINT->onDestroy();
+}
+
+static void onConstraintSetRegion(void* owner, void* data) {
+    const auto CONSTRAINT = (CConstraint*)owner;
+    CONSTRAINT->onSetRegion();
+}
+
+void CConstraint::initSignals() {
+    hyprListener_setConstraintRegion.initCallback(&m_pConstraint->events.set_region, ::onConstraintSetRegion, this, "CConstraint");
+    hyprListener_destroyConstraint.initCallback(&m_pConstraint->events.destroy, ::onConstraintDestroy, this, "CConstraint");
+}
+
+void CConstraint::onDestroy() {
+    if (active())
+        deactivate();
+
+    // this is us
+    m_pOwner->m_pConstraint.reset();
+}
+
+void CConstraint::onSetRegion() {
+    if (!m_bActive)
+        return;
+
+    m_rRegion.set(&m_pConstraint->region);
+    m_vPositionHint = m_rRegion.closestPoint(m_vPositionHint);
+    g_pInputManager->simulateMouseMovement(); // to warp the cursor if anything's amiss
+}
+
+void CConstraint::onCommit() {
+    if (!m_bActive)
+        return;
+
+    const auto COMMITTED = m_pConstraint->current.committed;
+
+    if (COMMITTED & WLR_POINTER_CONSTRAINT_V1_STATE_CURSOR_HINT) {
+        m_bHintSet      = true;
+        m_vPositionHint = {m_pConstraint->current.cursor_hint.x, m_pConstraint->current.cursor_hint.y};
+        g_pInputManager->simulateMouseMovement();
+    }
+
+    if (COMMITTED & WLR_POINTER_CONSTRAINT_V1_STATE_REGION)
+        onSetRegion();
+}
+
+CRegion CConstraint::logicConstraintRegion() {
+    CRegion    rg            = m_rRegion;
+    const auto SURFBOX       = m_pOwner->getSurfaceBoxGlobal();
+    const auto CONSTRAINTPOS = SURFBOX.has_value() ? SURFBOX->pos() : Vector2D{};
+    rg.translate(CONSTRAINTPOS);
+    return rg;
+}
+
+CWLSurface* CConstraint::owner() {
+    return m_pOwner;
+}
+
+bool CConstraint::isLocked() {
+    return m_pConstraint->type == WLR_POINTER_CONSTRAINT_V1_LOCKED;
+}
+
+Vector2D CConstraint::logicPositionHint() {
+    const auto SURFBOX       = m_pOwner->getSurfaceBoxGlobal();
+    const auto CONSTRAINTPOS = SURFBOX.has_value() ? SURFBOX->pos() : Vector2D{};
+
+    return m_bHintSet ? CONSTRAINTPOS + m_vPositionHint : m_vCursorPosOnActivate;
+}
+
+void CConstraint::deactivate() {
+    if (!m_bActive)
+        return;
+
+    wlr_pointer_constraint_v1_send_deactivated(m_pConstraint);
+    m_bActive = false;
+    g_pCompositor->warpCursorTo(logicPositionHint(), true);
+
+    if (m_pConstraint->lifetime == ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_ONESHOT)
+        m_bDead = true;
+}
+
+void CConstraint::activate() {
+    if (m_bActive || m_bDead)
+        return;
+
+    // TODO: hack, probably not a super duper great idea
+    if (g_pCompositor->m_sSeat.seat->pointer_state.focused_surface != m_pOwner->wlr()) {
+        const auto SURFBOX = m_pOwner->getSurfaceBoxGlobal();
+        const auto LOCAL   = SURFBOX.has_value() ? logicPositionHint() - SURFBOX->pos() : Vector2D{};
+        wlr_seat_pointer_enter(g_pCompositor->m_sSeat.seat, m_pOwner->wlr(), LOCAL.x, LOCAL.y);
+    }
+
+    g_pCompositor->warpCursorTo(logicPositionHint(), true);
+    wlr_pointer_constraint_v1_send_activated(m_pConstraint);
+    m_bActive = true;
+}
+
+bool CConstraint::active() {
+    return m_bActive;
+}