SystemMonitor: Port to KMainWindow

Currently, KSystemActivityDialog is derived from QDialog and therefore has several
limitations:
* it doesn't save and restore its size and position
* it doesn't respect Window Placement settings (it always opens in the center)

Porting it to KMainWindow removes these limitations and saves the user from creating
window rules to get around them.

BUG: 400298
FIXED-IN: 5.25

systemmonitor/ksystemactivitydialog.cpp

@@ -8,6 +8,8 @@
 
 #include "ksystemactivitydialog.h"
 
+#include "processui/ksysguardprocesslist.h"
+
 #include <QAction>
 #include <QCloseEvent>
 #include <QDBusConnection>
@@ -16,31 +18,36 @@
 #include <QString>
 #include <QVBoxLayout>
 
-#include <KConfigGroup>
 #include <KLocalizedString>
 #include <KSharedConfig>
 #include <KWindowSystem>
-#include <QDebug>
 
 KSystemActivityDialog::KSystemActivityDialog(QWidget *parent)
-    : QDialog(parent)
-    , m_processList(nullptr)
+    : KMainWindow(parent)
+    , m_configGroup(KSharedConfig::openConfig()->group("TaskDialog"))
 {
     setWindowTitle(i18n("System Activity"));
     setWindowIcon(QIcon::fromTheme(QStringLiteral("utilities-system-monitor")));
-    QVBoxLayout *mainLayout = new QVBoxLayout(this);
-    mainLayout->addWidget(&m_processList);
-    m_processList.setScriptingEnabled(true);
-    setSizeGripEnabled(true);
+    setAutoSaveSettings();
+
+    m_processList = new KSysGuardProcessList;
+    m_processList->setScriptingEnabled(true);
+
+    QVBoxLayout *mainLayout = new QVBoxLayout;
+    mainLayout->addWidget(m_processList);
 
-    // Since we kinda act like an application more than just a Window, map the usual ctrl+Q shortcut to close as well
-    QAction *closeWindow = new QAction(this);
-    closeWindow->setShortcut(QKeySequence::Quit);
-    connect(closeWindow, &QAction::triggered, this, &KSystemActivityDialog::accept);
-    addAction(closeWindow);
+    QWidget *mainWidget = new QWidget;
+    mainWidget->setLayout(mainLayout);
+    setCentralWidget(mainWidget);
 
-    KConfigGroup cg = KSharedConfig::openConfig()->group("TaskDialog");
-    m_processList.loadSettings(cg);
+    QAction *closeAction = new QAction;
+    closeAction->setShortcuts({ QKeySequence::Quit, Qt::Key_Escape });
+    connect(closeAction, &QAction::triggered, this, &KSystemActivityDialog::close);
+    addAction(closeAction);
+
+    if (m_configGroup.exists()) {
+        m_processList->loadSettings(m_configGroup);
+    }
 
     QDBusConnection con = QDBusConnection::sessionBus();
     con.registerObject(QStringLiteral("/"), this, QDBusConnection::ExportAllSlots);
@@ -56,33 +63,21 @@ void KSystemActivityDialog::run()
 
 void KSystemActivityDialog::setFilterText(const QString &filterText)
 {
-    m_processList.filterLineEdit()->setText(filterText);
-    m_processList.filterLineEdit()->setFocus();
+    m_processList->filterLineEdit()->setText(filterText);
+    m_processList->filterLineEdit()->setFocus();
 }
 
 QString KSystemActivityDialog::filterText() const
 {
-    return m_processList.filterLineEdit()->text();
+    return m_processList->filterLineEdit()->text();
 }
 
 void KSystemActivityDialog::closeEvent(QCloseEvent *event)
 {
-    saveDialogSettings();
-    event->accept();
-}
-
-void KSystemActivityDialog::reject()
-{
-    saveDialogSettings();
-    QDialog::reject();
-}
-
-void KSystemActivityDialog::saveDialogSettings()
-{
-    // When the user closes the dialog, save the process list setup
-    KConfigGroup cg = KSharedConfig::openConfig()->group("TaskDialog");
-    m_processList.saveSettings(cg);
+    m_processList->saveSettings(m_configGroup);
     KSharedConfig::openConfig()->sync();
+
+    KMainWindow::closeEvent(event);
 }
 
 QSize KSystemActivityDialog::sizeHint() const

systemmonitor/ksystemactivitydialog.h

@@ -8,16 +8,17 @@
 
 #ifndef Q_WS_WIN
 
-#include <QDialog>
+#include <KConfigGroup>
+#include <KMainWindow>
 
-#include "processui/ksysguardprocesslist.h"
+class KSysGuardProcessList;
 
 /** This creates a simple dialog box with a KSysguardProcessList
  *
  *  It remembers the size and position of the dialog, and sets
  *  the dialog to always be over the other windows
  */
-class KSystemActivityDialog : public QDialog
+class KSystemActivityDialog : public KMainWindow
 {
     Q_OBJECT
 public:
@@ -36,16 +37,12 @@ public:
 
     QSize sizeHint() const override;
 
-    /** Save the settings if the user presses the ESC key */
-    void reject() override;
-
 protected:
     /** Save the settings if the user clicks (x) button on the window */
     void closeEvent(QCloseEvent *event) override;
 
 private:
-    void saveDialogSettings();
-
-    KSysGuardProcessList m_processList;
+    KSysGuardProcessList *m_processList = nullptr;
+    KConfigGroup m_configGroup;
 };
 #endif // not Q_WS_WIN

systemmonitor/main.cpp

@@ -28,6 +28,8 @@ int main(int argc, char **argv)
         return 0;
     }
 
-    KSystemActivityDialog dialog;
-    return dialog.exec();
+    KSystemActivityDialog *dialog = new KSystemActivityDialog;
+    dialog->show();
+
+    return app.exec();
 }