From 8b3be23032385777a9981c9d408c3c9c822c267b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <mgraesslin@kde.org>
Date: Wed, 3 Jun 2015 17:56:59 +0200
Subject: [PATCH] Don't update focused pointer window on pointer movement while
 button is pressed

If a button is pressed all mouse events should go to the current surface
regardless of whether the pointer is on top of it or not.
---
 input.cpp | 18 +++++++++++++++++-
 input.h   |  1 +
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/input.cpp b/input.cpp
index 57ba3c1035..ab627cd008 100644
--- a/input.cpp
+++ b/input.cpp
@@ -465,7 +465,10 @@ void InputRedirection::processPointerMotion(const QPointF &pos, uint32_t time)
         return;
     }
     QWeakPointer<Toplevel> old = m_pointerWindow;
-    updatePointerWindow();
+    if (!areButtonsPressed()) {
+        // update pointer window only if no button is pressed
+        updatePointerWindow();
+    }
 #if HAVE_WAYLAND
     if (auto seat = findSeat()) {
         seat->setTimestamp(time);
@@ -500,6 +503,9 @@ void InputRedirection::processPointerButton(uint32_t button, InputRedirection::P
         state == PointerButtonPressed ? seat->pointerButtonPressed(button) : seat->pointerButtonReleased(button);
     }
 #endif
+    if (state == PointerButtonReleased && !areButtonsPressed()) {
+        updatePointerWindow();
+    }
 }
 
 void InputRedirection::processPointerAxis(InputRedirection::PointerAxis axis, qreal delta, uint32_t time)
@@ -789,6 +795,16 @@ Qt::MouseButtons InputRedirection::qtButtonStates() const
     return buttons;
 }
 
+bool InputRedirection::areButtonsPressed() const
+{
+    for (auto it = m_pointerButtons.constBegin(); it != m_pointerButtons.constEnd(); ++it) {
+        if (it.value() == KWin::InputRedirection::PointerButtonPressed) {
+            return true;
+        }
+    }
+    return false;
+}
+
 Toplevel *InputRedirection::findToplevel(const QPoint &pos)
 {
     if (!Workspace::self()) {
diff --git a/input.h b/input.h
index a29d2d9d17..2a33e10945 100644
--- a/input.h
+++ b/input.h
@@ -183,6 +183,7 @@ private:
     void updateFocusedPointerPosition();
     void updateFocusedTouchPosition();
     void updateTouchWindow(const QPointF &pos);
+    bool areButtonsPressed() const;
     QPointF m_globalPointer;
     QHash<uint32_t, PointerButtonState> m_pointerButtons;
 #if HAVE_XKB