[plasma/kwin] src: Repurpose Gravity::None as Gravity::Center

Git commit 81300c5ff2df6a6671ecd54edc35a635475c568e by Vlad Zahorodnii.
Committed on 03/08/2026 at 13:24.
Pushed by vladz into branch 'master'.

Repurpose Gravity::None as Gravity::Center

M  +1    -1    src/tiles/customtile.cpp
M  +2    -2    src/tiles/tile.cpp
M  +4    -2    src/utils/gravity.cpp
M  +1    -1    src/utils/gravity.h
M  +1    -1    src/wayland/xdgshell.cpp
M  +1    -1    src/wayland/xxpip_v1.cpp
M  +14   -14   src/window.cpp
M  +3    -3    src/window.h
M  +1    -1    src/xdgshellwindow.cpp

https://invent.kde.org/plasma/kwin/-/commit/81300c5ff2df6a6671ecd54edc35a635475c568e

diff --git a/src/tiles/customtile.cpp b/src/tiles/customtile.cpp
index 70fa4485bea..c606acbc124 100644
--- a/src/tiles/customtile.cpp
+++ b/src/tiles/customtile.cpp
@@ -184,7 +184,7 @@ void CustomTile::setRelativeGeometry(const RectF &geom)
 bool CustomTile::supportsResizeGravity(KWin::Gravity gravity)
 {
     if (layoutDirection() == LayoutDirection::Floating) {
-        return gravity != Gravity::None;
+        return gravity != Gravity::Center;
     }
 
     return Tile::supportsResizeGravity(gravity);
diff --git a/src/tiles/tile.cpp b/src/tiles/tile.cpp
index 85cfb975a8c..510917e01fc 100644
--- a/src/tiles/tile.cpp
+++ b/src/tiles/tile.cpp
@@ -99,7 +99,7 @@ bool Tile::supportsResizeGravity(Gravity gravity)
         return m_relativeGeometry.bottom() < 1.0 && m_relativeGeometry.left() > 0.0;
     case Gravity::BottomRight:
         return m_relativeGeometry.bottom() < 1.0 && m_relativeGeometry.right() < 1.0;
-    case Gravity::None:
+    case Gravity::Center:
     default:
         return false;
     }
@@ -332,7 +332,7 @@ void Tile::resizeFromGravity(Gravity gravity, int x_root, int y_root)
     case Gravity::Right:
         newGeom.setRight(relativePos.x() + m_padding / outGeom.width());
         break;
-    case Gravity::None:
+    case Gravity::Center:
         Q_UNREACHABLE();
         break;
     }
diff --git a/src/utils/gravity.cpp b/src/utils/gravity.cpp
index 6334ddbeb0e..ed83aa38c25 100644
--- a/src/utils/gravity.cpp
+++ b/src/utils/gravity.cpp
@@ -10,7 +10,7 @@ namespace KWin
 {
 
 Gravity::Gravity()
-    : m_kind(None)
+    : m_kind(Center)
 {
 }
 
@@ -29,6 +29,9 @@ RectF Gravity::apply(const RectF &rect, const RectF &bounds) const
     RectF geometry = rect;
 
     switch (m_kind) {
+    case Gravity::Center:
+        geometry.moveCenter(bounds.center());
+        break;
     case Gravity::TopLeft:
         geometry.moveRight(bounds.right());
         geometry.moveBottom(bounds.bottom());
@@ -45,7 +48,6 @@ RectF Gravity::apply(const RectF &rect, const RectF &bounds) const
         geometry.moveLeft(bounds.left());
         geometry.moveVerticalCenter(bounds.verticalCenter());
         break;
-    case Gravity::None:
     case Gravity::BottomRight:
         geometry.moveLeft(bounds.left());
         geometry.moveTop(bounds.top());
diff --git a/src/utils/gravity.h b/src/utils/gravity.h
index 59c97d451ab..edd490f22e6 100644
--- a/src/utils/gravity.h
+++ b/src/utils/gravity.h
@@ -18,7 +18,7 @@ class KWIN_EXPORT Gravity
 {
 public:
     enum Kind {
-        None,
+        Center,
         Left,
         Right,
         Top,
diff --git a/src/wayland/xdgshell.cpp b/src/wayland/xdgshell.cpp
index c0943c9be93..21785a63616 100644
--- a/src/wayland/xdgshell.cpp
+++ b/src/wayland/xdgshell.cpp
@@ -487,7 +487,7 @@ void XdgToplevelInterfacePrivate::xdg_toplevel_resize(Resource *resource, ::wl_r
     Gravity gravity;
     switch (xdgEdges) {
     case resize_edge_none:
-        gravity = Gravity::None;
+        gravity = Gravity::Center;
         break;
     case resize_edge_top:
         gravity = Gravity::Top;
diff --git a/src/wayland/xxpip_v1.cpp b/src/wayland/xxpip_v1.cpp
index 801dc59d629..4071bce924d 100644
--- a/src/wayland/xxpip_v1.cpp
+++ b/src/wayland/xxpip_v1.cpp
@@ -205,7 +205,7 @@ void XXPipV1InterfacePrivate::xx_pip_v1_resize(Resource *resource, struct ::wl_r
     Gravity gravity;
     switch (edges) {
     case resize_edge_none:
-        gravity = Gravity::None;
+        gravity = Gravity::Center;
         break;
     case resize_edge_top:
         gravity = Gravity::Top;
diff --git a/src/window.cpp b/src/window.cpp
index 9c033bd21b2..f551106130d 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -1033,8 +1033,8 @@ bool Window::startInteractiveMoveResize()
     if (isRequestedFullScreen() && (workspace()->outputs().count() < 2 || !isMovableAcrossScreens())) {
         return false;
     }
-    if ((interactiveMoveResizeGravity() == Gravity::None && !isMovableAcrossScreens())
-        || (interactiveMoveResizeGravity() != Gravity::None && !isResizable())) {
+    if ((interactiveMoveResizeGravity() == Gravity::Center && !isMovableAcrossScreens())
+        || (interactiveMoveResizeGravity() != Gravity::Center && !isResizable())) {
         return false;
     }
     if (!doStartInteractiveMoveResize()) {
@@ -1310,7 +1310,7 @@ static RegionF interactiveMoveResizeVisibleSubrectRegion(const RectF &geometry,
 
     RectF initialRect = availableArea;
     switch (gravity) {
-    case Gravity::None:
+    case Gravity::Center:
     case Gravity::Top:
         // resizing from the top is handled like moving the window to avoid zero width rectangles when window width is equal to minWidth
         initialRect.adjust(0, 0, -minVisibleArea.width(), -minVisibleArea.height());
@@ -1336,7 +1336,7 @@ static RegionF interactiveMoveResizeVisibleSubrectRegion(const RectF &geometry,
     RegionF availableRegion(initialRect);
 
     switch (gravity) {
-    case Gravity::None:
+    case Gravity::Center:
     case Gravity::Top:
     case Gravity::Left:
     case Gravity::TopLeft:
@@ -1378,7 +1378,7 @@ static std::optional<QPointF> confineInteractiveMove(const RectF &geometry, cons
     const QSizeF effectiveMinVisibleArea(std::min(geometry.width(), minVisibleArea.width()),
                                          std::min(geometry.height(), minVisibleArea.height()));
 
-    const RegionF visibleSubrectRegion = interactiveMoveResizeVisibleSubrectRegion(geometry, Gravity::None, effectiveMinVisibleArea);
+    const RegionF visibleSubrectRegion = interactiveMoveResizeVisibleSubrectRegion(geometry, Gravity::Center, effectiveMinVisibleArea);
     const QPointF anchor = geometry.topLeft();
     for (RectF rect : visibleSubrectRegion.rects()) {
         // Extend the left edge of the rect so the right edge of the window can be
@@ -1498,7 +1498,7 @@ std::optional<QPointF> Window::confineInteractiveResize(const RectF &geometry, G
         case Gravity::Right:
             break;
 
-        case Gravity::None:
+        case Gravity::Center:
             Q_UNREACHABLE();
         }
 
@@ -1533,7 +1533,7 @@ std::optional<QPointF> Window::confineInteractiveResize(const RectF &geometry, G
             constrainedRect.setRight(std::min(constrainedRect.right(), geometry.left() + maxFrameSize.width()));
             break;
 
-        case Gravity::None:
+        case Gravity::Center:
             Q_UNREACHABLE();
         }
 
@@ -1592,7 +1592,7 @@ RectF Window::nextInteractiveResizeGeometry(const QPointF &global) const
     RectF nextMoveResizeGeom = moveResizeGeometry();
 
     const Gravity gravity = interactiveMoveResizeGravity();
-    if (gravity == Gravity::None || !isResizable()) {
+    if (gravity == Gravity::Center || !isResizable()) {
         return nextMoveResizeGeom;
     }
 
@@ -1627,7 +1627,7 @@ RectF Window::nextInteractiveResizeGeometry(const QPointF &global) const
     case Gravity::Right:
         nextMoveResizeGeom = RectF(orig.topLeft(), QPointF(bottomright.x(), orig.bottom()));
         break;
-    case Gravity::None:
+    case Gravity::Center:
         Q_UNREACHABLE();
         break;
     }
@@ -1664,7 +1664,7 @@ RectF Window::nextInteractiveResizeGeometry(const QPointF &global) const
     case Gravity::Left:
         nextMoveResizeGeom.setLeft(nextMoveResizeGeom.right() - constrainedSize.width());
         break;
-    case Gravity::None:
+    case Gravity::Center:
         Q_UNREACHABLE();
     }
 
@@ -2155,7 +2155,7 @@ bool Window::performMousePressCommand(Options::MouseCommand cmd, const QPointF &
         if (isInteractiveMoveResize()) {
             finishInteractiveMoveResize(false);
         }
-        setInteractiveMoveResizeGravity(Gravity::None);
+        setInteractiveMoveResizeGravity(Gravity::Center);
         setInteractiveMoveResizePointerButtonDown(true);
         setInteractiveMoveResizeAnchor(globalPos);
         setInteractiveMoveResizeModifiers(Qt::KeyboardModifiers());
@@ -2411,7 +2411,7 @@ void Window::updateInteractiveMoveResizeCursor()
     }
     Gravity gravity = interactiveMoveResizeGravity();
     if (!isResizable()) {
-        gravity = Gravity::None;
+        gravity = Gravity::Center;
     }
     CursorShape c = Qt::ArrowCursor;
     switch (gravity) {
@@ -2641,10 +2641,10 @@ Gravity Window::mouseGravity() const
         case Qt::TopRightSection:
             return Gravity::TopRight;
         default:
-            return Gravity::None;
+            return Gravity::Center;
         }
     }
-    return Gravity::None;
+    return Gravity::Center;
 }
 
 void Window::endInteractiveMoveResize()
diff --git a/src/window.h b/src/window.h
index 8ab31081e8f..fc419ba3777 100644
--- a/src/window.h
+++ b/src/window.h
@@ -1152,14 +1152,14 @@ public:
      */
     bool isInteractiveMove() const
     {
-        return isInteractiveMoveResize() && interactiveMoveResizeGravity() == Gravity::None;
+        return isInteractiveMoveResize() && interactiveMoveResizeGravity() == Gravity::Center;
     }
     /**
      * Returns @c true if the Client is being interactively resized; otherwise @c false.
      */
     bool isInteractiveResize() const
     {
-        return isInteractiveMoveResize() && interactiveMoveResizeGravity() != Gravity::None;
+        return isInteractiveMoveResize() && interactiveMoveResizeGravity() != Gravity::Center;
     }
     Gravity interactiveMoveResizeGravity() const
     {
@@ -1881,7 +1881,7 @@ protected:
         QPointF offset;
         RectF initialGeometry;
         RectF initialGeometryRestore;
-        Gravity gravity = Gravity::None;
+        Gravity gravity = Gravity::Center;
         bool buttonDown = false;
         CursorShape cursor = Qt::ArrowCursor;
         QString initialOutputId;
diff --git a/src/xdgshellwindow.cpp b/src/xdgshellwindow.cpp
index be50886f177..d6c39cca58e 100644
--- a/src/xdgshellwindow.cpp
+++ b/src/xdgshellwindow.cpp
@@ -870,7 +870,7 @@ void XdgToplevelWindow::doSetQuickTileMode()
 
 bool XdgToplevelWindow::doStartInteractiveMoveResize()
 {
-    if (interactiveMoveResizeGravity() != Gravity::None) {
+    if (interactiveMoveResizeGravity() != Gravity::Center) {
         m_nextGravity = interactiveMoveResizeGravity();
         m_nextStates |= XdgToplevelInterface::State::Resizing;
         scheduleConfigure();