fix: cache appearance opacity in the shell

applets/dde-appearance/appearanceapplet.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2024 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2024 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -39,11 +39,7 @@ bool AppearanceApplet::load()
 
 qreal AppearanceApplet::opacity() const
 {
-    if (!m_interface)
-        return -1;
-
-    // The minimum opacity is 0.2
-    return std::max(0.2, m_interface->opacity());
+    return m_opacity;
 }
 
 void AppearanceApplet::initDBusProxy()
@@ -56,11 +52,25 @@ void AppearanceApplet::initDBusProxy()
     if (!m_interface->isValid()) {
         qWarning() << "Failed to proxy Appearance, error:" << m_interface->lastError();
         m_interface.reset();
+        updateOpacity(-1);
         return;
     }
 
-    m_interface->setSync(false);
-    QObject::connect(m_interface.data(), &org::deepin::dde::Appearance1::OpacityChanged, this, &AppearanceApplet::opacityChanged);
+    QObject::connect(m_interface.data(), &org::deepin::dde::Appearance1::OpacityChanged,
+                     this, &AppearanceApplet::updateOpacity);
+    updateOpacity(m_interface->opacity());
+}
+
+void AppearanceApplet::updateOpacity(qreal opacity)
+{
+    if (opacity >= 0) {
+        // The minimum opacity is 0.2
+        opacity = std::max(0.2, opacity);
+    }
+    if (qFuzzyCompare(m_opacity, opacity))
+        return;
+
+    m_opacity = opacity;
     Q_EMIT opacityChanged();
 }
 

applets/dde-appearance/appearanceapplet.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2024 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2024 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -24,8 +24,10 @@ class AppearanceApplet : public DApplet
     void opacityChanged();
 private:
     void initDBusProxy();
+    void updateOpacity(qreal opacity);
 private:
     QScopedPointer<org::deepin::dde::Appearance1> m_interface;
+    qreal m_opacity = -1;
 };
 
 }

panels/dock/taskmanager/taskmanager.cpp

@@ -538,8 +538,8 @@ void TaskManager::modifyOpacityChanged()
     DS_NAMESPACE::DAppletBridge appearanceBridge("org.deepin.ds.dde-appearance");
     auto appearanceApplet = appearanceBridge.applet();
     if (appearanceApplet) {
-        double opacity = appearanceApplet->property("opacity").toReal();
         if (auto x11Monitor = qobject_cast<X11WindowMonitor*>(m_windowMonitor.data())) {
+            double opacity = appearanceApplet->property("opacity").toReal();
             x11Monitor->setPreviewOpacity(opacity);
         }
     } else {