From fdbc9e113b7c4361f148508c8332487d9385105d Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Fri, 23 Dec 2022 15:30:22 +0200
Subject: Client: Port to QPlatformTheme::{MouseCursorTheme,MouseCursorSize}

It allows the platform theme to specify the preferred cursor theme and
cursor size without resorting to hacks such as setting XCURSOR_THEME and
XCURSOR_SIZE environment variables.

Change-Id: I9e44f9c6dddbb5d730f8ac092f2c11fdbccf8d27
Reviewed-by: Liang Qi <liang.qi@qt.io>
(cherry picked from commit 1c25db5e3f23d48e330170f41b94fbd532932b02)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/client/qwaylandinputdevice.cpp | 33 +++++++++++++++++----------------
 src/client/qwaylandinputdevice_p.h |  2 --
 2 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/src/client/qwaylandinputdevice.cpp b/src/client/qwaylandinputdevice.cpp
index 724243cc..30f19757 100644
--- a/src/client/qwaylandinputdevice.cpp
+++ b/src/client/qwaylandinputdevice.cpp
@@ -36,6 +36,7 @@
 #include <QtGui/private/qguiapplication_p.h>
 #include <qpa/qplatformwindow.h>
 #include <qpa/qplatforminputcontext.h>
+#include <qpa/qplatformtheme.h>
 #include <QDebug>
 
 #include <unistd.h>
@@ -229,19 +230,6 @@ private:
     QPoint m_hotspot;
 };
 
-QString QWaylandInputDevice::Pointer::cursorThemeName() const
-{
-    static QString themeName = qEnvironmentVariable("XCURSOR_THEME", QStringLiteral("default"));
-    return themeName;
-}
-
-int QWaylandInputDevice::Pointer::cursorSize() const
-{
-    constexpr int defaultCursorSize = 24;
-    static const int xCursorSize = qEnvironmentVariableIntValue("XCURSOR_SIZE");
-    return xCursorSize > 0 ? xCursorSize : defaultCursorSize;
-}
-
 int QWaylandInputDevice::Pointer::idealCursorScale() const
 {
     if (seat()->mQDisplay->compositor()->version() < 3) {
@@ -258,17 +246,30 @@ int QWaylandInputDevice::Pointer::idealCursorScale() const
 
 void QWaylandInputDevice::Pointer::updateCursorTheme()
 {
+    QString cursorThemeName;
+    QSize cursorSize;
+
+    if (const QPlatformTheme *platformTheme = QGuiApplicationPrivate::platformTheme()) {
+        cursorThemeName = platformTheme->themeHint(QPlatformTheme::MouseCursorTheme).toString();
+        cursorSize = platformTheme->themeHint(QPlatformTheme::MouseCursorSize).toSize();
+    }
+
+    if (cursorThemeName.isEmpty())
+        cursorThemeName = QStringLiteral("default");
+    if (cursorSize.isEmpty())
+        cursorSize = QSize(24, 24);
+
     int scale = idealCursorScale();
-    int pixelSize = cursorSize() * scale;
+    int pixelSize = cursorSize.width() * scale;
     auto *display = seat()->mQDisplay;
-    mCursor.theme = display->loadCursorTheme(cursorThemeName(), pixelSize);
+    mCursor.theme = display->loadCursorTheme(cursorThemeName, pixelSize);
 
     if (!mCursor.theme)
         return; // A warning has already been printed in loadCursorTheme
 
     if (auto *arrow = mCursor.theme->cursor(Qt::ArrowCursor)) {
         int arrowPixelSize = qMax(arrow->images[0]->width, arrow->images[0]->height); // Not all cursor themes are square
-        while (scale > 1 && arrowPixelSize / scale < cursorSize())
+        while (scale > 1 && arrowPixelSize / scale < cursorSize.width())
             --scale;
     } else {
         qCWarning(lcQpaWayland) << "Cursor theme does not support the arrow cursor";
diff --git a/src/client/qwaylandinputdevice_p.h b/src/client/qwaylandinputdevice_p.h
index fbc26008..17f01f49 100644
--- a/src/client/qwaylandinputdevice_p.h
+++ b/src/client/qwaylandinputdevice_p.h
@@ -280,8 +280,6 @@ public:
     ~Pointer() override;
     QWaylandWindow *focusWindow() const;
 #if QT_CONFIG(cursor)
-    QString cursorThemeName() const;
-    int cursorSize() const; // in surface coordinates
     int idealCursorScale() const;
     void updateCursorTheme();
     void updateCursor();
-- 
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