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21 #ifndef _SETTINGSPAGE_H_
22 #define _SETTINGSPAGE_H_
31 //! A SettingsPage is a page in the settings dialog.
32 /** The SettingsDlg provides suitable standard buttons, such as Ok, Apply, Cancel, Restore Defaults and Reset.
33 * Some pages might also be used in standalone dialogs or other containers. A SettingsPage provides suitable
34 * slots and signals to allow interaction with the container.
36 * A derived class needs to keep track of its changed state. Whenever a child widget changes, it needs to be
37 * compared to its value in permanent storage, and the changed state updated accordingly by calling setChangedState().
38 * For most standard widgets, SettingsPage can do this automatically if desired. Such a child widget needs to have
39 * a dynamic property \c settingsKey that maps to the key in the client configuration file. This key is appended
40 * to settingsKey(), which must be set to a non-null value in a derived class. If the widget's key starts with '/',
41 * its key is treated as a global path starting from the root, rather than from settingsKey().
42 * A second dynamic property \c defaultValue can be defined in child widgets as well.
44 * For widgets requiring special ways for storing and saving, define the property settingsKey and leave it empty. In this
45 * case, the methods saveAutoWidgetValue() and loadAutoWidgetValue() will be called with the widget's objectName as parameter.
47 * SettingsPage manages loading, saving, setting to default and setting the changed state for all automatic child widgets.
48 * Derived classes must be sure to call initAutoWidgets() *after* setupUi(); they also need to call the baseclass implementations
49 * of load(), save() and defaults() (preferably at the end of the derived function, since they call setChangedState(false)).
51 * The following widgets can be handled for now:
52 * - QGroupBox (isChecked())
53 * - QAbstractButton (isChecked(), e.g. for QCheckBox and QRadioButton)
54 * - QLineEdit, QTextEdit (text())
55 * - QComboBox (currentIndex())
56 * - QSpinBox (value())
58 class SettingsPage : public QWidget
63 SettingsPage(const QString &category, const QString &name, QWidget *parent = 0);
64 virtual ~SettingsPage() {};
66 //! The category of this settings page.
67 inline virtual QString category() const { return _category; }
69 //! The title of this settings page.
70 inline virtual QString title() const { return _title; }
72 //! Whether the settingspage needs a core connection to be selectable
73 /** This is a hint for the settingspage dialog. Do not rely on the settingspage not being
74 * visible if disconnected, and care about disabling it yourself.
76 inline virtual bool needsCoreConnection() const { return false; }
79 * Whether the settingspage should be selectable or not, in a given situation
80 * Used for pages that should only be visible if certain features are available (or not).
83 inline virtual bool isSelectable() const { return true; }
85 //! The key this settings page stores its values under
86 /** This needs to be overriden to enable automatic loading/saving/hasChanged checking of widgets.
87 * The child widgets' values will be stored in client settings under this key. Every widget that
88 * should be automatically handled needs to have a \c settingsKey property set, and should also provide
89 * a \c defaultValue property.
90 * You can return an empty string (as opposed to a null string) to use the config root as a base, and
91 * you can override this key for individual widgets by prefixing their SettingsKey with /.
93 inline virtual QString settingsKey() const { return QString(); }
95 //! Derived classes need to define this and return true if they have default settings.
96 /** If this method returns true, the "Restore Defaults" button in the SettingsDlg is
97 * enabled. You also need to provide an implementation of defaults() then.
99 * The default implementation returns false.
101 inline virtual bool hasDefaults() const { return false; }
103 //! Check if there are changes in the page, compared to the state saved in permanent storage.
104 inline bool hasChanged() const { return _changed || _autoWidgetsChanged; }
106 //! Called immediately before save() is called.
107 /** Derived classes should return false if saving is not possible (e.g. the current settings are invalid).
108 * \return false, if the SettingsPage cannot be saved in its current state.
110 inline virtual bool aboutToSave() { return true; }
112 //! sets checked state depending on \checked and stores the value for later comparision
113 static void load(QCheckBox *box, bool checked);
114 static bool hasChanged(QCheckBox *box);
115 static void load(QComboBox *box, int index);
116 static bool hasChanged(QComboBox *box);
117 static void load(QSpinBox *box, int value);
118 static bool hasChanged(QSpinBox *box);
119 static void load(FontSelector *box, QFont value);
120 static bool hasChanged(FontSelector *box);
123 //! Save settings to permanent storage.
124 /** This baseclass implementation saves the autoWidgets, so be sure to call it if you use
125 * this feature in your settingsPage!
129 //! Load settings from permanent storage, overriding any changes the user might have made in the dialog.
130 /** This baseclass implementation loads the autoWidgets, so be sure to call it if you use
131 * this feature in your settingsPage!
135 //! Restore defaults, overriding any changes the user might have made in the dialog.
136 /** This baseclass implementation loads the defaults of the autoWidgets (if available), so be sure
137 * to call it if you use this feature in your settingsPage!
139 virtual void defaults();
142 //! Calling this slot is equivalent to calling setChangedState(true).
143 inline void changed() { setChangedState(true); }
145 //! This should be called whenever the widget state changes from unchanged to change or the other way round.
146 void setChangedState(bool hasChanged = true);
149 void initAutoWidgets();
150 virtual QVariant loadAutoWidgetValue(const QString &widgetName);
151 virtual void saveAutoWidgetValue(const QString &widgetName, const QVariant &value);
154 //! Emitted whenever the widget state changes.
155 void changed(bool hasChanged);
159 void autoWidgetHasChanged();
162 void findAutoWidgets(QObject *parent, QObjectList *widgetList) const;
163 QByteArray autoWidgetPropertyName(QObject *widget) const;
164 QString autoWidgetSettingsKey(QObject *widget) const;
166 QString _category, _title;
167 bool _changed, _autoWidgetsChanged;
168 QObjectList _autoWidgets;