From 79c081e2ea35eb36c66cd7fd7656ef5d98163b09 Mon Sep 17 00:00:00 2001
From: Kai Uwe Broulik <kde@privat.broulik.de>
Date: Mon, 25 Apr 2016 11:38:07 +0200
Subject: [PATCH] [OSD] Load QML file on demand

Differential Revision: https://phabricator.kde.org/D1475
---
 shell/osd.cpp | 67 ++++++++++++++++++++++++++++++---------------------
 shell/osd.h   |  9 ++++---
 2 files changed, 45 insertions(+), 31 deletions(-)

diff --git a/shell/osd.cpp b/shell/osd.cpp
index dc2dcc902..290a661ce 100644
--- a/shell/osd.cpp
+++ b/shell/osd.cpp
@@ -31,27 +31,9 @@
 
 Osd::Osd(ShellCorona *corona)
     : QObject(corona)
+    , m_osdPath(corona->lookAndFeelPackage().filePath("osdmainscript"))
 {
-    const QString osdPath = corona->lookAndFeelPackage().filePath("osdmainscript");
-    if (osdPath.isEmpty()) {
-        qWarning() << "Failed to load the OSD QML file file from" << osdPath;
-        return;
-    }
-
-    m_osdObject = new KDeclarative::QmlObject(this);
-    m_osdObject->setSource(QUrl::fromLocalFile(osdPath));
-    if (m_osdObject->status() != QQmlComponent::Ready) {
-        qWarning() << "Failed to load OSD QML file";
-        return;
-    }
-
-    m_timeout = m_osdObject->rootObject()->property("timeout").toInt();
-
     QDBusConnection::sessionBus().registerObject(QStringLiteral("/org/kde/osdService"), this, QDBusConnection::ExportAllSlots | QDBusConnection::ExportAllSignals);
-
-    m_osdTimer = new QTimer(this);
-    m_osdTimer->setSingleShot(true);
-    connect(m_osdTimer, &QTimer::timeout, this, &Osd::hideOsd);
 }
 
 Osd::~Osd()
@@ -106,14 +88,46 @@ void Osd::virtualDesktopChanged(const QString &currentVirtualDesktopName)
     showText(QString(), currentVirtualDesktopName);
 }
 
+bool Osd::init()
+{
+    if (m_osdObject && m_osdObject->rootObject()) {
+        return true;
+    }
+
+    if (m_osdPath.isEmpty()) {
+        return false;
+    }
+
+    if (!m_osdObject) {
+        m_osdObject = new KDeclarative::QmlObject(this);
+    }
+
+    m_osdObject->setSource(QUrl::fromLocalFile(m_osdPath));
+
+    if (m_osdObject->status() != QQmlComponent::Ready) {
+        qWarning() << "Failed to load OSD QML file" << m_osdPath;
+        return false;
+    }
+
+    m_timeout = m_osdObject->rootObject()->property("timeout").toInt();
+
+    if (!m_osdTimer) {
+        m_osdTimer = new QTimer(this);
+        m_osdTimer->setSingleShot(true);
+        connect(m_osdTimer, &QTimer::timeout, this, &Osd::hideOsd);
+    }
+
+    return true;
+}
+
 void Osd::showProgress(const QString &icon, const int percent, const QString &additionalText)
 {
-    auto *rootObject = m_osdObject->rootObject();
-    if (!rootObject) {
-        qWarning() << "Failed to load OSD QML file";
+    if (!init()) {
         return;
     }
 
+    auto *rootObject = m_osdObject->rootObject();
+
     int value = qBound(0, percent, 100);
     rootObject->setProperty("osdValue", value);
     rootObject->setProperty("osdAdditionalText", additionalText);
@@ -126,12 +140,12 @@ void Osd::showProgress(const QString &icon, const int percent, const QString &ad
 
 void Osd::showText(const QString &icon, const QString &text)
 {
-    auto *rootObject = m_osdObject->rootObject();
-    if (!rootObject) {
-        qWarning() << "Failed to load OSD QML file";
+    if (!init()) {
         return;
     }
 
+    auto *rootObject = m_osdObject->rootObject();
+
     rootObject->setProperty("showingProgress", false);
     rootObject->setProperty("osdValue", text);
     rootObject->setProperty("icon", icon);
@@ -145,9 +159,6 @@ void Osd::showOsd()
     m_osdTimer->stop();
 
     auto *rootObject = m_osdObject->rootObject();
-    if (!rootObject) {
-        return;
-    }
 
     // if our OSD understands animating the opacity, do it;
     // otherwise just show it to not break existing lnf packages
diff --git a/shell/osd.h b/shell/osd.h
index 7dc080a46..9cc54acd7 100644
--- a/shell/osd.h
+++ b/shell/osd.h
@@ -54,13 +54,16 @@ private Q_SLOTS:
     void hideOsd();
 
 private:
+    bool init();
+
     void showProgress(const QString &icon, const int percent, const QString &additionalText = QString());
     void showText(const QString &icon, const QString &text);
     void showOsd();
 
-    KDeclarative::QmlObject *m_osdObject;
-    QTimer *m_osdTimer;
-    int m_timeout;
+    QString m_osdPath;
+    KDeclarative::QmlObject *m_osdObject = nullptr;
+    QTimer *m_osdTimer = nullptr;
+    int m_timeout = 0;
 };
 
 #endif // OSD_H