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 /*
     KSysGuard, the KDE System Guard
 
     SPDX-FileCopyrightText: 1999, 2000 Chris Schlaeger <cs@kde.org>
     SPDX-FileCopyrightText: 2006 John Tapsell <john.tapsell@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 
 */
 
 #ifndef _KSysGuardProcessList_h_
 #define _KSysGuardProcessList_h_
 
 #include <QMetaType>
 #include <QWidget>
 
 #include <KConfigGroup>
 
 #include "ProcessFilter.h"
 #include "ProcessModel.h"
 #include <processcore/processes.h>
 
 class QShowEvent;
 class QHideEvent;
 class QLineEdit;
 class QTreeView;
 struct KSysGuardProcessListPrivate;
 
 /**
  * This widget implements a process list page. Besides the process
  * list which is implemented as a ProcessList, it contains two
  * combo boxes and two buttons.  The combo boxes are used to set the
  * update rate and the process filter.  The buttons are used to force
  * an immediate update and to kill a process.
  */
 class Q_DECL_EXPORT KSysGuardProcessList : public QWidget
 {
     Q_OBJECT
     Q_PROPERTY(bool showTotalsInTree READ showTotals WRITE setShowTotals)
     Q_PROPERTY(ProcessFilter::State state READ state WRITE setState)
     Q_PROPERTY(int updateIntervalMSecs READ updateIntervalMSecs WRITE setUpdateIntervalMSecs)
     Q_PROPERTY(ProcessModel::Units units READ units WRITE setUnits)
     Q_PROPERTY(bool killButtonVisible READ isKillButtonVisible WRITE setKillButtonVisible)
     Q_PROPERTY(bool scriptingEnabled READ scriptingEnabled WRITE setScriptingEnabled)
     Q_ENUMS(ProcessFilter::State)
     Q_ENUMS(ProcessModel::Units)
 
 public:
     explicit KSysGuardProcessList(QWidget *parent = nullptr, const QString &hostName = QString());
     ~KSysGuardProcessList() override;
 
     QLineEdit *filterLineEdit() const;
     QTreeView *treeView() const;
 
     /** Returns which processes we are currently filtering for and the way in which we show them.
      *  @see setState()
      */
     ProcessFilter::State state() const;
 
     /** Returns the number of milliseconds that have to elapse before updating the list of processes.
      *  If this is 0, the processes will not be automatically updated. */
     int updateIntervalMSecs() const;
 
     /** Whether the widget will show child totals for CPU and Memory etc usage */
     bool showTotals() const;
 
     /** The units to display memory sizes etc in.  E.g. kb/mb/gb */
     ProcessModel::Units units() const;
 
     /** Returns a list of the processes that have been selected by the user. */
     QList<KSysGuard::Process *> selectedProcesses() const;
 
     /** Returns the number of processes currently being displayed
      *
      *  To get the total number processes, visible or not, use processModel()->
      * */
     int visibleProcessesCount() const;
 
     /** Save the current state of the widget to the given config group
      *
      *  @param[in] cg Config group to add these settings to
      * */
     void saveSettings(KConfigGroup &cg);
 
     /** Load the saved state of the widget from the given config group */
     void loadSettings(const KConfigGroup &cg);
 
     /** Returns the process model used. Use with caution. */
     ProcessModel *processModel();
 
     /** Restore the headings to the given state. */
     void restoreHeaderState(const QByteArray &state);
 
     /** @returns whether the Kill Process button is visible. */
     bool isKillButtonVisible() const;
 
     /** @param visible defines whether the Kill Process button is shown or not. */
     void setKillButtonVisible(bool visible);
 
     /** Whether scripting support is enabled.
      *
      *  Default is false. */
     bool scriptingEnabled() const;
     /** Set whether scripting support is enabled.
      *
      *  Default is false. */
     void setScriptingEnabled(bool enabled);
 
 Q_SIGNALS:
     /** Emitted when the display has been updated */
     void updated();
     void processListChanged();
 
 public Q_SLOTS:
     /** Inform the view that the user has changed the selection */
     void selectionChanged();
 
     /** Send a kill signal to all the processes that the user has selected.  Pops up a dialog box to confirm with the user */
     void killSelectedProcesses();
 
     /** Send a signal to all the processes that the user has selected.
      * @p confirm - If true, pops up a dialog box to confirm with the user
      */
     void sendSignalToSelectedProcesses(int sig, bool confirm);
 
     /** Send a signal to a list of given processes.
      *   @p pids A list of PIDs that should be sent the signal
      *   @p sig  The signal to send.
      *   @return Whether the kill went ahead. True if successful or user cancelled.  False if there was a problem
      */
     bool killProcesses(const QList<long long> &pids, int sig);
 
     /** Renice all the processes that the user has selected.  Pops up a dialog box to ask for the nice value and confirm */
     void reniceSelectedProcesses();
 
     /** Change the CPU scheduler for the given of processes to the given scheduler, with the given scheduler priority.
      *  If the scheduler is Other or Batch, @p newCpuSchedPriority is ignored.
      *   @return Whether the cpu scheduler changing went ahead.  True if successful or user cancelled.  False if there was a problem
      */
     bool changeCpuScheduler(const QList<long long> &pids, KSysGuard::Process::Scheduler newCpuSched, int newCpuSchedPriority);
 
     /** Change the I/O scheduler for the given of processes to the given scheduler, with the given scheduler priority.
      *  If the scheduler is Other or Batch, @p newCpuSchedPriority is ignored.
      *   @return Whether the cpu scheduler changing went ahead.  True if successful or user cancelled.  False if there was a problem
      */
     bool changeIoScheduler(const QList<long long> &pids, KSysGuard::Process::IoPriorityClass newIoSched, int newIoSchedPriority);
     /** Renice the processes given to the given niceValue.
      *   @return Whether the kill went ahead.  True if successful or user cancelled.  False if there was a problem
      * */
     bool reniceProcesses(const QList<long long> &pids, int niceValue);
 
     /** Fetch new process information and redraw the display */
     void updateList();
 
     /** Set which processes we are currently filtering for and the way in which we show them. */
     void setState(ProcessFilter::State state);
 
     /** Set the number of milliseconds that have to elapse before updating the list of processes.
      *  If this is set to 0, the process list will not be automatically updated and the owner can call
      *  updateList() manually. */
     void setUpdateIntervalMSecs(int intervalMSecs);
 
     /** Set whether to show child totals for CPU and Memory etc usage */
     void setShowTotals(bool showTotals);
 
     /** Focus on a particular process, and select it */
     void selectAndJumpToProcess(int pid);
 
     /** The units to display memory sizes etc in. */
     void setUnits(ProcessModel::Units unit);
 
     /** Row was just inserted in the filter model */
     void rowsInserted(const QModelIndex &parent, int start, int end);
 
 private Q_SLOTS:
     /** Expand all the children, recursively, of the node given.  Pass an empty QModelIndex to expand all the top level children */
     void expandAllChildren(const QModelIndex &parent);
 
     /** Expand init to show its children, but not the sub children processes. */
     void expandInit();
 
     /** Display a context menu for the column headings allowing the user to show or hide columns. */
     void showColumnContextMenu(const QPoint &point);
 
     /**  Display a context menu for the given process allowing the user to kill etc the process */
     void showProcessContextMenu(const QModelIndex &index);
 
     /** Display a context menu for the selected processes allowing the user to kill etc the process */
     void showProcessContextMenu(const QPoint &point);
 
     /** Set state from combo box int value */
     void setStateInt(int state);
 
     /** Called when the text in the gui filter text box has changed */
     void filterTextChanged(const QString &newText);
 
     /** Called when one of the actions (kill, renice etc) is clicked etc */
     void actionTriggered(QObject *object);
 
 protected:
     /** Inherit QWidget::showEvent(QShowEvent *) to enable the timer, for updates, when visible */
     void showEvent(QShowEvent *) override;
 
     /** Inherit QWidget::hideEvent(QShowEvent *) to disable the timer, for updates, when not visible */
     void hideEvent(QHideEvent *) override;
 
     /** Capture any change events sent to this widget.  In particular QEvent::LanguageChange */
     void changeEvent(QEvent *event) override;
 
     bool eventFilter(QObject *obj, QEvent *event) override;
 
     /** Retranslate the Ui as needed */
     void retranslateUi();
 
 private:
     KSysGuardProcessListPrivate *const d;
 };
 
 Q_DECLARE_METATYPE(long long)
 Q_DECLARE_METATYPE(QList<long long>)
 
 #endif