inputmethod: Use touch events to decide if the panel is shown not the state

Prefer hiding/showing the panel (i.e. the window) when not a touch event
than stopping to make the inputmethod active.
This way we remain compatible with non-virtualkeyboard inputmethods.

src/inputmethod.cpp

@@ -86,7 +86,6 @@ void InputMethod::init()
         new TextInputManagerV2Interface(waylandServer()->display());
         new TextInputManagerV3Interface(waylandServer()->display());
 
-        connect(workspace(), &Workspace::clientAdded, this, &InputMethod::clientAdded);
         connect(waylandServer()->seat(), &SeatInterface::focusedTextInputSurfaceChanged, this, &InputMethod::handleFocusedSurfaceChanged);
 
         TextInputV2Interface *textInputV2 = waylandServer()->seat()->textInputV2();
@@ -118,11 +117,15 @@ void InputMethod::hide()
     setActive(false);
 }
 
-void InputMethod::setActive(bool active)
+bool InputMethod::touchEventTriggered() const
 {
-    active &= input()->touch()
+    return input()->touch()
            && input()->touch()->lastEventTime() > input()->keyboard()->lastEventTime()
            && input()->touch()->lastEventTime() > input()->pointer()->lastEventTime();
+}
+
+void InputMethod::setActive(bool active)
+{
     const bool wasActive = waylandServer()->inputMethod()->context();
     if (wasActive && !active) {
         waylandServer()->inputMethod()->sendDeactivate();
@@ -148,18 +151,14 @@ void InputMethod::setActive(bool active)
     }
 }
 
-void InputMethod::clientAdded(AbstractClient *_client)
+void InputMethod::setPanel(InputPanelV1Client *client)
 {
-    if (!_client->isInputMethod()) {
-        return;
-    }
-
+    Q_ASSERT(client->isInputMethod());
     if (m_inputClient) {
-        qCWarning(KWIN_VIRTUALKEYBOARD) << "Replacing input client" << m_inputClient << "with" << _client;
+        qCWarning(KWIN_VIRTUALKEYBOARD) << "Replacing input client" << m_inputClient << "with" << client;
         disconnect(m_inputClient, nullptr, this, nullptr);
     }
 
-    const auto client = dynamic_cast<InputPanelV1Client *>(_client);
     m_inputClient = client;
     connect(client->surface(), &SurfaceInterface::inputChanged, this, &InputMethod::updateInputPanelState);
     connect(client, &QObject::destroyed, this, [this] {
@@ -253,6 +252,9 @@ void InputMethod::textInputInterfaceV2StateUpdated(quint32 serial, KWaylandServe
     if (!t2 || !t2->isEnabled()) {
         return;
     }
+    if (m_inputClient && touchEventTriggered()) {
+        m_inputClient->allow();
+    }
     switch (reason) {
     case KWaylandServer::TextInputV2Interface::UpdateReason::StateChange:
         break;
@@ -526,6 +528,10 @@ void InputMethod::updateInputPanelState()
         return;
     }
 
+    if (m_inputClient && touchEventTriggered()) {
+        m_inputClient->allow();
+    }
+
     QRect overlap = QRect(0, 0, 0, 0);
     if (m_trackedClient) {
         const bool bottomKeyboard = m_inputClient && m_inputClient->mode() != InputPanelV1Client::Overlay && m_inputClient->isShown(false);

src/inputmethod.h

@@ -54,6 +54,7 @@ public:
     bool isVisible() const;
     bool isAvailable() const;
 
+    void setPanel(InputPanelV1Client* client);
     void setInputMethodCommand(const QString &path);
 
 Q_SIGNALS:
@@ -63,8 +64,6 @@ Q_SIGNALS:
     void availableChanged();
 
 private Q_SLOTS:
-    void clientAdded(AbstractClient* client);
-
     // textinput interface slots
     void handleFocusedSurfaceChanged();
     void surroundingTextChanged();
@@ -94,6 +93,8 @@ private:
     void setTrackedClient(AbstractClient *trackedClient);
     void installKeyboardGrab(KWaylandServer::InputMethodGrabV1 *keyboardGrab);
 
+    bool touchEventTriggered() const;
+
     struct {
         QString text = QString();
         quint32 begin = 0;

src/inputpanelv1client.cpp

@@ -13,6 +13,7 @@
 #include "workspace.h"
 #include "abstract_wayland_output.h"
 #include "platform.h"
+#include "inputmethod.h"
 #include <KWaylandServer/output_interface.h>
 #include <KWaylandServer/seat_interface.h>
 #include <KWaylandServer/surface_interface.h>
@@ -38,6 +39,8 @@ InputPanelV1Client::InputPanelV1Client(InputPanelSurfaceV1Interface *panelSurfac
     connect(panelSurface, &InputPanelSurfaceV1Interface::topLevel, this, &InputPanelV1Client::showTopLevel);
     connect(panelSurface, &InputPanelSurfaceV1Interface::overlayPanel, this, &InputPanelV1Client::showOverlayPanel);
     connect(panelSurface, &InputPanelSurfaceV1Interface::destroyed, this, &InputPanelV1Client::destroyClient);
+
+    InputMethod::self()->setPanel(this);
 }
 
 void InputPanelV1Client::showOverlayPanel()
@@ -53,12 +56,20 @@ void InputPanelV1Client::showTopLevel(OutputInterface *output, InputPanelSurface
     Q_UNUSED(position);
     m_mode = Toplevel;
     setOutput(output);
-    reposition();
+}
+
+void InputPanelV1Client::allow()
+{
     setReadyForPainting();
+    reposition();
 }
 
 void KWin::InputPanelV1Client::reposition()
 {
+    if (!readyForPainting()) {
+        return;
+    }
+
     switch (m_mode) {
         case Toplevel: {
             if (m_output) {
@@ -109,7 +120,7 @@ NET::WindowType InputPanelV1Client::windowType(bool, int) const
 
 QRect InputPanelV1Client::inputGeometry() const
 {
-    return surface()->input().boundingRect().translated(pos());
+    return readyForPainting() ? surface()->input().boundingRect().translated(pos()) : QRect();
 }
 
 void InputPanelV1Client::setOutput(OutputInterface *outputIface)

src/inputpanelv1client.h

@@ -47,6 +47,7 @@ public:
     {
         return m_mode;
     }
+    void allow();
 
 protected:
     void moveResizeInternal(const QRect &rect, MoveResizeMode mode) override;