1 /***************************************************************************
2 * Copyright (C) 2005-2018 by the Quassel Project *
3 * devel@quassel-irc.org *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) version 3. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
19 ***************************************************************************/
23 #include "uisupport-export.h"
32 //! A SettingsPage is a page in the settings dialog.
33 /** The SettingsDlg provides suitable standard buttons, such as Ok, Apply, Cancel, Restore Defaults and Reset.
34 * Some pages might also be used in standalone dialogs or other containers. A SettingsPage provides suitable
35 * slots and signals to allow interaction with the container.
37 * A derived class needs to keep track of its changed state. Whenever a child widget changes, it needs to be
38 * compared to its value in permanent storage, and the changed state updated accordingly by calling setChangedState().
39 * For most standard widgets, SettingsPage can do this automatically if desired. Such a child widget needs to have
40 * a dynamic property \c settingsKey that maps to the key in the client configuration file. This key is appended
41 * to settingsKey(), which must be set to a non-null value in a derived class. If the widget's key starts with '/',
42 * its key is treated as a global path starting from the root, rather than from settingsKey().
43 * A second dynamic property \c defaultValue can be defined in child widgets as well.
45 * For widgets requiring special ways for storing and saving, define the property settingsKey and leave it empty. In this
46 * case, the methods saveAutoWidgetValue() and loadAutoWidgetValue() will be called with the widget's objectName as parameter.
48 * SettingsPage manages loading, saving, setting to default and setting the changed state for all automatic child widgets.
49 * Derived classes must be sure to call initAutoWidgets() *after* setupUi(); they also need to call the baseclass implementations
50 * of load(), save() and defaults() (preferably at the end of the derived function, since they call setChangedState(false)).
52 * The following widgets can be handled for now:
53 * - QGroupBox (isChecked())
54 * - QAbstractButton (isChecked(), e.g. for QCheckBox and QRadioButton)
55 * - QLineEdit, QTextEdit (text())
56 * - QComboBox (currentIndex())
57 * - QSpinBox (value())
59 class UISUPPORT_EXPORT SettingsPage : public QWidget
64 SettingsPage(const QString &category, const QString &name, QWidget *parent = 0);
65 virtual ~SettingsPage() {};
67 //! The category of this settings page.
68 inline virtual QString category() const { return _category; }
70 //! The title of this settings page.
71 inline virtual QString title() const { return _title; }
73 //! Whether the settingspage needs a core connection to be selectable
74 /** This is a hint for the settingspage dialog. Do not rely on the settingspage not being
75 * visible if disconnected, and care about disabling it yourself.
77 inline virtual bool needsCoreConnection() const { return false; }
80 * Whether the settingspage should be selectable or not, in a given situation
81 * Used for pages that should only be visible if certain features are available (or not).
84 inline virtual bool isSelectable() const { return true; }
86 //! The key this settings page stores its values under
87 /** This needs to be overriden to enable automatic loading/saving/hasChanged checking of widgets.
88 * The child widgets' values will be stored in client settings under this key. Every widget that
89 * should be automatically handled needs to have a \c settingsKey property set, and should also provide
90 * a \c defaultValue property.
91 * You can return an empty string (as opposed to a null string) to use the config root as a base, and
92 * you can override this key for individual widgets by prefixing their SettingsKey with /.
94 inline virtual QString settingsKey() const { return QString(); }
96 //! Derived classes need to define this and return true if they have default settings.
97 /** If this method returns true, the "Restore Defaults" button in the SettingsDlg is
98 * enabled. You also need to provide an implementation of defaults() then.
100 * The default implementation returns false.
102 inline virtual bool hasDefaults() const { return false; }
104 //! Check if there are changes in the page, compared to the state saved in permanent storage.
105 inline bool hasChanged() const { return _changed || _autoWidgetsChanged; }
107 //! Called immediately before save() is called.
108 /** Derived classes should return false if saving is not possible (e.g. the current settings are invalid).
109 * \return false, if the SettingsPage cannot be saved in its current state.
111 inline virtual bool aboutToSave() { return true; }
113 //! sets checked state depending on \checked and stores the value for later comparision
114 static void load(QCheckBox *box, bool checked);
115 static bool hasChanged(QCheckBox *box);
116 static void load(QComboBox *box, int index);
117 static bool hasChanged(QComboBox *box);
118 static void load(QSpinBox *box, int value);
119 static bool hasChanged(QSpinBox *box);
120 static void load(FontSelector *box, QFont value);
121 static bool hasChanged(FontSelector *box);
124 //! Save settings to permanent storage.
125 /** This baseclass implementation saves the autoWidgets, so be sure to call it if you use
126 * this feature in your settingsPage!
130 //! Load settings from permanent storage, overriding any changes the user might have made in the dialog.
131 /** This baseclass implementation loads the autoWidgets, so be sure to call it if you use
132 * this feature in your settingsPage!
136 //! Restore defaults, overriding any changes the user might have made in the dialog.
137 /** This baseclass implementation loads the defaults of the autoWidgets (if available), so be sure
138 * to call it if you use this feature in your settingsPage!
140 virtual void defaults();
143 //! Calling this slot is equivalent to calling setChangedState(true).
144 inline void changed() { setChangedState(true); }
146 //! This should be called whenever the widget state changes from unchanged to change or the other way round.
147 void setChangedState(bool hasChanged = true);
150 void initAutoWidgets();
151 virtual QVariant loadAutoWidgetValue(const QString &widgetName);
152 virtual void saveAutoWidgetValue(const QString &widgetName, const QVariant &value);
155 //! Emitted whenever the widget state changes.
156 void changed(bool hasChanged);
160 void autoWidgetHasChanged();
163 void findAutoWidgets(QObject *parent, QObjectList *widgetList) const;
164 QByteArray autoWidgetPropertyName(QObject *widget) const;
165 QString autoWidgetSettingsKey(QObject *widget) const;
167 QString _category, _title;
168 bool _changed, _autoWidgetsChanged;
169 QObjectList _autoWidgets;