From 338772ca404e35ee54d98ba6c8c8f5b9224b6d0f Mon Sep 17 00:00:00 2001
From: David Redondo <kde@david-redondo.de>
Date: Mon, 7 Mar 2022 14:25:36 +0100
Subject: [PATCH] Open Klipper under mouse also on wayland

On Wayland if Plasma had no focus when the shortcut was invoked
- the menu window is  created as toplevel because it has no parent and
  there is no current focusWindow
- the application can't know the currrent cursor position
We use a newly introduced request on plasma_surface to open under the cursor.
As it can only be called before mapping a buffer to a surface, the menu is hidden
before being shown again.
BUG:436249
FIXED-IN:5.25
---
 klipper/CMakeLists.txt |  1 +
 klipper/klipper.cpp    | 35 ++++++++++++++++++++++++++++++++++-
 klipper/klipper.h      | 11 +++++++++++
 3 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/klipper/CMakeLists.txt b/klipper/CMakeLists.txt
index 0370354ba..825533db2 100644
--- a/klipper/CMakeLists.txt
+++ b/klipper/CMakeLists.txt
@@ -47,6 +47,7 @@ target_link_libraries(libklipper_common_static
     KF5::WindowSystem
     KF5::WidgetsAddons
     KF5::XmlGui
+    KF5::WaylandClient
     ${ZLIB_LIBRARY})
 if (X11_FOUND)
     target_link_libraries(libklipper_common_static XCB::XCB)
diff --git a/klipper/klipper.cpp b/klipper/klipper.cpp
index 3b11c6ecc..c91e1d134 100644
--- a/klipper/klipper.cpp
+++ b/klipper/klipper.cpp
@@ -27,6 +27,10 @@
 #include <KNotification>
 #include <KSystemClipboard>
 #include <KToggleAction>
+#include <KWayland/Client/connection_thread.h>
+#include <KWayland/Client/plasmashell.h>
+#include <KWayland/Client/registry.h>
+#include <KWayland/Client/surface.h>
 #include <KWindowSystem>
 
 #include "configdialog.h"
@@ -113,6 +117,7 @@ Klipper::Klipper(QObject *parent, const KSharedConfigPtr &config, KlipperMode mo
     , m_config(config)
     , m_pendingContentsCheck(false)
     , m_mode(mode)
+    , m_plasmashell(nullptr)
 {
     if (m_mode == KlipperMode::Standalone) {
         setenv("KSNI_NO_DBUSMENU", "1", 1);
@@ -249,6 +254,18 @@ Klipper::Klipper(QObject *parent, const KSharedConfigPtr &config, KlipperMode mo
             m_notification->setHint(QStringLiteral("desktop-entry"), QStringLiteral("org.kde.klipper"));
         }
     });
+
+    if (KWindowSystem::isPlatformWayland()) {
+        auto registry = new KWayland::Client::Registry(this);
+        auto connection = KWayland::Client::ConnectionThread::fromApplication(qGuiApp);
+        connect(registry, &KWayland::Client::Registry::plasmaShellAnnounced, this, [registry, this](quint32 name, quint32 version) {
+            if (!m_plasmashell) {
+                m_plasmashell = registry->createPlasmaShell(name, version);
+            }
+        });
+        registry->create(connection);
+        registry->setup();
+    }
 }
 
 Klipper::~Klipper()
@@ -384,10 +401,26 @@ void Klipper::saveSettings() const
 void Klipper::showPopupMenu(QMenu *menu)
 {
     Q_ASSERT(menu != nullptr);
-
+    if (m_plasmashell) {
+        menu->hide();
+        menu->windowHandle()->installEventFilter(this);
+    }
     menu->popup(QCursor::pos());
 }
 
+bool Klipper::eventFilter(QObject *filtered, QEvent *event)
+{
+    const bool ret = QObject::eventFilter(filtered, event);
+    auto menuWindow = qobject_cast<QWindow *>(filtered);
+    if (menuWindow && event->type() == QEvent::Expose && menuWindow->isVisible()) {
+        auto surface = KWayland::Client::Surface::fromWindow(menuWindow);
+        auto plasmaSurface = m_plasmashell->createSurface(surface, menuWindow);
+        plasmaSurface->openUnderCursor();
+        menuWindow->removeEventFilter(this);
+    }
+    return ret;
+}
+
 bool Klipper::loadHistory()
 {
     static const char failed_load_warning[] = "Failed to load history resource. Clipboard history cannot be read.";
diff --git a/klipper/klipper.h b/klipper/klipper.h
index 81ffa13fb..306c55538 100644
--- a/klipper/klipper.h
+++ b/klipper/klipper.h
@@ -31,6 +31,14 @@ class HistoryItem;
 class KNotification;
 class KSystemClipboard;
 
+namespace KWayland
+{
+namespace Client
+{
+class PlasmaShell;
+}
+}
+
 enum class KlipperMode {
     Standalone,
     DataEngine,
@@ -65,6 +73,8 @@ public:
     Klipper(QObject *parent, const KSharedConfigPtr &config, KlipperMode mode = KlipperMode::Standalone);
     ~Klipper() override;
 
+    bool eventFilter(QObject *object, QEvent *event) override;
+
     /**
      * Get clipboard history (the "document")
      */
@@ -223,4 +233,5 @@ private:
     KlipperMode m_mode;
     QTimer *m_saveFileTimer = nullptr;
     QPointer<KNotification> m_notification;
+    KWayland::Client::PlasmaShell *m_plasmashell;
 };