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 /* This file is part of the KDE libraries
     SPDX-FileCopyrightText: 2001, 2002 Ellis Whitehead <ellis@kde.org>
     SPDX-FileCopyrightText: 2007 Andreas Hartmetz <ahartmetz@gmail.com>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #ifndef KKEYSEQUENCEWIDGET_H
 #define KKEYSEQUENCEWIDGET_H
 
 #include <kritawidgetutils_export.h>
 
 #include <QList>
 #include <QPushButton>
 
 class KisKKeySequenceWidgetPrivate;
 class QAction;
 class KisKActionCollection;
 
 /**
  * @short A widget to input a QKeySequence.
  *
  * This widget lets the user choose a QKeySequence, which is usually used as a
  * shortcut key. The recording is initiated by calling captureKeySequence() or
  * the user clicking into the widget.
  *
  * The widgets provides support for conflict handling. See
  * setCheckForConflictsAgainst() for more information.
  *
  * \image html kkeysequencewidget.png "KDE Key Sequence Widget"
  *
  * @author Mark Donohoe <donohoe@kde.org>
  * @internal
  */
 class KRITAWIDGETUTILS_EXPORT KisKKeySequenceWidget: public QWidget
 {
     Q_OBJECT
 
     Q_FLAGS(ShortcutTypes)
 
     Q_PROPERTY(
         bool multiKeyShortcutsAllowed
         READ multiKeyShortcutsAllowed
         WRITE setMultiKeyShortcutsAllowed)
 
     Q_PROPERTY(
         ShortcutTypes checkForConflictsAgainst
         READ checkForConflictsAgainst
         WRITE setCheckForConflictsAgainst)
 
     Q_PROPERTY(
         bool modifierlessAllowed
         READ isModifierlessAllowed
         WRITE setModifierlessAllowed)
 
 public:
     ///An enum about validation when setting a key sequence.
     ///@see setKeySequence()
     enum Validation {
         ///Validate key sequence
         Validate = 0,
         ///Use key sequence without validation
         NoValidate = 1
     };
 
     /**
     * Constructor.
     */
     explicit KisKKeySequenceWidget(QWidget *parent = 0);
 
     /**
     * Destructs the widget.
     */
     ~KisKKeySequenceWidget() override;
 
     /**
      * \name Configuration
      *
      * Configuration options for the widget.
      */
     //@{
 
     enum ShortcutType {
         None           = 0x00,      //!< No checking for conflicts
         LocalShortcuts = 0x01,      //!< Check with local shortcuts. @see setCheckActionCollections()
         StandardShortcuts = 0x02,   //!< Check against standard shortcuts. @see KStandardShortcut
         GlobalShortcuts = 0x04      //!< Check against global shortcuts. @see KGlobalAccel
     };
     Q_DECLARE_FLAGS(ShortcutTypes, ShortcutType)
 
     /**
      * Configure if the widget should check for conflicts with existing
      * shortcuts.
      *
      * When capturing a key sequence for local shortcuts you should check
      * against GlobalShortcuts and your other local shortcuts. This is the
      * default.
      *
      * You have to provide the local actions to check against with
      * setCheckActionCollections().
      *
      * When capturing a key sequence for a global shortcut you should
      * check against StandardShortcuts, GlobalShortcuts and your local
      * shortcuts.
      *
      * There are two ways to react to a user agreeing to steal a shortcut:
      *
      * 1. Listen to the stealShortcut() signal and steal the shortcuts
      * manually. It's your responsibility to save that change later when
      * you think it is appropriate.
      *
      * 2. Call applyStealShortcut and KisKKeySequenceWidget will steal the
      * shortcut. This will save the actionCollections the shortcut is part
      * of so make sure it doesn't inadvertently save some unwanted changes
      * too. Read its documentation for some limitation when handling
      * global shortcuts.
     *
      * If you want to do the conflict checking yourself here are some code
      * snippets for global ...
      *
      * \code
      * QStringList conflicting = KGlobalAccel::findActionNameSystemwide(keySequence);
      * if (!conflicting.isEmpty()) {
      *     // Inform and ask the user about the conflict and reassigning
      *     // the keys sequence
      *     if (!KGlobalAccel::promptStealShortcutSystemwide(q, conflicting, keySequence)) {
      *         return true;
      *     }
      *     KGlobalAccel::stealShortcutSystemwide(keySequence);
      * }
      * \endcode
      *
      * ...  and standard shortcuts
      *
      * \code
      * KStandardShortcut::StandardShortcut ssc = KStandardShortcut::find(keySequence);
      * if (ssc != KStandardShortcut::AccelNone) {
      *     // We have a conflict
      * }
      * \endcode
      *
      *
      * @since 4.2
      */
     void setCheckForConflictsAgainst(ShortcutTypes types);
 
     /**
      * The shortcut types we check for conflicts.
      *
      * @see setCheckForConflictsAgainst()
      * @since 4.2
      */
     ShortcutTypes checkForConflictsAgainst() const;
 
     /**
      * Allow multikey shortcuts?
      */
     void setMultiKeyShortcutsAllowed(bool);
     bool multiKeyShortcutsAllowed() const;
 
     /**
      * This only applies to user input, not to setShortcut().
      * Set whether to accept "plain" keys without modifiers (like Ctrl, Alt, Meta).
      * Plain keys by our definition include letter and symbol keys and
      * text editing keys (Return, Space, Tab, Backspace, Delete).
      * "Special" keys like F1, Cursor keys, Insert, PageDown will always work.
      */
     void setModifierlessAllowed(bool allow);
 
     /**
      * @see setModifierlessAllowed()
      */
     bool isModifierlessAllowed();
 
     /**
      * Set whether a small button to set an empty key sequence should be displayed next to the
      * main input widget. The default is to show the clear button.
      */
     void setClearButtonShown(bool show);
 
     //@}
 
     /**
      * Checks whether the key sequence @a seq is available to grab.
      *
      * The sequence is checked under the same rules as if it has been typed by
      * the user. This method is useful if you get key sequences from another
      * input source and want to check if it is save to set them.
      *
      * @since 4.2
      */
     bool isKeySequenceAvailable(const QKeySequence &seq) const;
 
     /**
      * Return the currently selected key sequence.
      */
     QKeySequence keySequence() const;
 
     /**
      * Set a list of action collections to check against for conflicting shortcut.
      *
      * @see setCheckForConflictsAgainst()
      *
      * If a KAction with a conflicting shortcut is found inside this list and
      * its shortcut can be configured (KAction::isShortcutConfigurable()
      * returns true) the user will be prompted whether to steal the shortcut
      * from this action.
      *
      * @since 4.1
      */
     void setCheckActionCollections(const QList<KisKActionCollection *> &actionCollections);
 
     /**
      * If the component using this widget supports shortcuts contexts, it has
      * to set its component name so we can check conflicts correctly.
      */
     void setComponentName(const QString &componentName);
 
 Q_SIGNALS:
 
     /**
      * This signal is emitted when the current key sequence has changed, be it by user
      * input or programmatically.
      */
     void keySequenceChanged(const QKeySequence &seq);
 
     /**
      * This signal is emitted after the user agreed to steal a shortcut from
      * an action. This is only done for local shortcuts. So you can be sure \a
      * action is one of the actions you provided with setCheckActionList() or
      * setCheckActionCollections().
      *
      * If you listen to that signal and don't call applyStealShortcut() you
      * are supposed to steal the shortcut and save this change.
      */
     void stealShortcut(const QKeySequence &seq, QAction *action);
 
 public Q_SLOTS:
 
     /**
      * Capture a shortcut from the keyboard. This call will only return once a key sequence
      * has been captured or input was aborted.
      * If a key sequence was input, keySequenceChanged() will be emitted.
      *
      * @see setModifierlessAllowed()
      */
     void captureKeySequence();
 
     /**
      * Set the key sequence.
      *
      * If @p val == Validate, and the call is actually changing the key sequence,
      * conflicting shortcut will be checked.
      */
     void setKeySequence(const QKeySequence &seq, Validation val = NoValidate);
 
     /**
      * Clear the key sequence.
      */
     void clearKeySequence();
 
     /**
      * Actually remove the shortcut that the user wanted to steal, from the
      * action that was using it. This only applies to actions provided to us
      * by setCheckActionCollections() and setCheckActionList().
      *
      * Global and Standard Shortcuts have to be stolen immediately when the
      * user gives his consent (technical reasons). That means those changes
      * will be active even if you never call applyStealShortcut().
      *
      * To be called before you apply your changes. No local shortcuts are
      * stolen until this function is called.
      */
     void applyStealShortcut();
 
 private:
     Q_PRIVATE_SLOT(d, void doneRecording())
 
 private:
     friend class KisKKeySequenceWidgetPrivate;
     KisKKeySequenceWidgetPrivate *const d;
 
     Q_DISABLE_COPY(KisKKeySequenceWidget)
 };
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(KisKKeySequenceWidget::ShortcutTypes)
 
 #endif //KKEYSEQUENCEWIDGET_H