wayland: show cursor if stylus is in proximity

While a stylus is in proximity we want to show its cursor. In this commit
it only gets shown on move because for a still unknown reason the position
is out of date before the first move event.

BUG: 443921

src/CMakeLists.txt

@@ -123,7 +123,7 @@ set(kwin_SRCS
     syncalarmx11filter.cpp
     tablet_input.cpp
     toplevel.cpp
-    touch_hide_cursor_spy.cpp
+    hide_cursor_spy.cpp
     touch_input.cpp
     udev.cpp
     unmanaged.cpp

src/hide_cursor_spy.cpp

@@ -6,26 +6,27 @@
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
-#include "touch_hide_cursor_spy.h"
+#include "hide_cursor_spy.h"
 #include "main.h"
 #include "platform.h"
+#include "input_event.h"
 
 namespace KWin
 {
 
-void TouchHideCursorSpy::pointerEvent(MouseEvent *event)
+void HideCursorSpy::pointerEvent(MouseEvent *event)
 {
     Q_UNUSED(event)
     showCursor();
 }
 
-void TouchHideCursorSpy::wheelEvent(KWin::WheelEvent *event)
+void HideCursorSpy::wheelEvent(KWin::WheelEvent *event)
 {
     Q_UNUSED(event)
     showCursor();
 }
 
-void TouchHideCursorSpy::touchDown(qint32 id, const QPointF &pos, quint32 time)
+void HideCursorSpy::touchDown(qint32 id, const QPointF &pos, quint32 time)
 {
     Q_UNUSED(id)
     Q_UNUSED(pos)
@@ -33,7 +34,16 @@ void TouchHideCursorSpy::touchDown(qint32 id, const QPointF &pos, quint32 time)
     hideCursor();
 }
 
-void TouchHideCursorSpy::showCursor()
+void HideCursorSpy::tabletToolEvent(TabletEvent *event)
+{
+    if (event->type() == QEvent::Type::TabletLeaveProximity) {
+        hideCursor();
+    } else {
+        showCursor();
+    }
+}
+
+void HideCursorSpy::showCursor()
 {
     if (!m_cursorHidden) {
         return;
@@ -42,7 +52,7 @@ void TouchHideCursorSpy::showCursor()
     kwinApp()->platform()->showCursor();
 }
 
-void TouchHideCursorSpy::hideCursor()
+void HideCursorSpy::hideCursor()
 {
     if (m_cursorHidden) {
         return;

src/hide_cursor_spy.h

@@ -12,12 +12,13 @@
 namespace KWin
 {
 
-class TouchHideCursorSpy : public InputEventSpy
+class HideCursorSpy : public InputEventSpy
 {
 public:
     void pointerEvent(KWin::MouseEvent *event) override;
     void wheelEvent(KWin::WheelEvent *event) override;
     void touchDown(qint32 id, const QPointF &pos, quint32 time) override;
+    void tabletToolEvent(TabletEvent *event) override;
 
 private:
     void showCursor();

src/input.cpp

@@ -23,7 +23,7 @@
 #include "pointer_input.h"
 #include "session.h"
 #include "tablet_input.h"
-#include "touch_hide_cursor_spy.h"
+#include "hide_cursor_spy.h"
 #include "touch_input.h"
 #include "x11client.h"
 #ifdef KWIN_BUILD_TABBOX
@@ -2455,7 +2455,7 @@ void InputRedirection::setupInputFilters()
         installInputEventFilter(new VirtualTerminalFilter);
     }
     if (waylandServer()) {
-        installInputEventSpy(new TouchHideCursorSpy);
+        installInputEventSpy(new HideCursorSpy);
         installInputEventSpy(new UserActivitySpy);
         if (hasGlobalShortcutSupport) {
             installInputEventFilter(new TerminateServerFilter);