1/***************************************************************************
2 * Copyright (C) 2005-2014 by the Quassel Project *
3 * devel@quassel-irc.org *
4 * *
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. *
9 * *
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. *
14 * *
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17 * Free Software Foundation, Inc., *
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
19 ***************************************************************************/
20
21#ifndef _SETTINGSPAGE_H_
22#define _SETTINGSPAGE_H_
23
24#include <QWidget>
25
26class QCheckBox;
27class QComboBox;
28class QSpinBox;
29
30//! A SettingsPage is a page in the settings dialog.
31/** The SettingsDlg provides suitable standard buttons, such as Ok, Apply, Cancel, Restore Defaults and Reset.
32 * Some pages might also be used in standalone dialogs or other containers. A SettingsPage provides suitable
33 * slots and signals to allow interaction with the container.
34 *
35 * A derived class needs to keep track of its changed state. Whenever a child widget changes, it needs to be
36 * compared to its value in permanent storage, and the changed state updated accordingly by calling setChangedState().
37 * For most standard widgets, SettingsPage can do this automatically if desired. Such a child widget needs to have
38 * a dynamic property \c settingsKey that maps to the key in the client configuration file. This key is appended
39 * to settingsKey(), which must be set to a non-null value in a derived class. If the widget's key starts with '/',
40 * its key is treated as a global path starting from the root, rather than from settingsKey().
41 * A second dynamic property \c defaultValue can be defined in child widgets as well.
42 *
43 * For widgets requiring special ways for storing and saving, define the property settingsKey and leave it empty. In this
44 * case, the methods saveAutoWidgetValue() and loadAutoWidgetValue() will be called with the widget's objectName as parameter.
45 *
46 * SettingsPage manages loading, saving, setting to default and setting the changed state for all automatic child widgets.
47 * Derived classes must be sure to call initAutoWidgets() *after* setupUi(); they also need to call the baseclass implementations
48 * of load(), save() and defaults() (preferably at the end of the derived function, since they call setChangedState(false)).
49 *
50 * The following widgets can be handled for now:
51 * - QGroupBox (isChecked())
52 * - QAbstractButton (isChecked(), e.g. for QCheckBox and QRadioButton)
53 * - QLineEdit, QTextEdit (text())
54 * - QComboBox (currentIndex())
55 * - QSpinBox (value())
56 */
57class SettingsPage : public QWidget
58{
59 Q_OBJECT
60
61public:
62 SettingsPage(const QString &category, const QString &name, QWidget *parent = 0);
63 virtual ~SettingsPage() {};
64
65 //! The category of this settings page.
66 inline virtual QString category() const { return _category; }
67
68 //! The title of this settings page.
69 inline virtual QString title() const { return _title; }
70
71 //! Whether the settingspage needs a core connection to be selectable
72 /** This is a hint for the settingspage dialog. Do not rely on the settingspage not being
73 * visible if disconnected, and care about disabling it yourself.
74 */
75 inline virtual bool needsCoreConnection() const { return false; }
76
77 //! The key this settings page stores its values under
78 /** This needs to be overriden to enable automatic loading/saving/hasChanged checking of widgets.
79 * The child widgets' values will be stored in client settings under this key. Every widget that
80 * should be automatically handled needs to have a \c settingsKey property set, and should also provide
81 * a \c defaultValue property.
82 * You can return an empty string (as opposed to a null string) to use the config root as a base, and
83 * you can override this key for individual widgets by prefixing their SettingsKey with /.
84 */
85 inline virtual QString settingsKey() const { return QString(); }
86
87 //! Derived classes need to define this and return true if they have default settings.
88 /** If this method returns true, the "Restore Defaults" button in the SettingsDlg is
89 * enabled. You also need to provide an implementation of defaults() then.
90 *
91 * The default implementation returns false.
92 */
93 inline virtual bool hasDefaults() const { return false; }
94
95 //! Check if there are changes in the page, compared to the state saved in permanent storage.
96 inline bool hasChanged() const { return _changed || _autoWidgetsChanged; }
97
98 //! Called immediately before save() is called.
99 /** Derived classes should return false if saving is not possible (e.g. the current settings are invalid).
100 * \return false, if the SettingsPage cannot be saved in its current state.
101 */
102 inline virtual bool aboutToSave() { return true; }
103
104 //! sets checked state depending on \checked and stores the value for later comparision
105 static void load(QCheckBox *box, bool checked);
106 static bool hasChanged(QCheckBox *box);
107 static void load(QComboBox *box, int index);
108 static bool hasChanged(QComboBox *box);
109 static void load(QSpinBox *box, int value);
110 static bool hasChanged(QSpinBox *box);
111
112public slots:
113 //! Save settings to permanent storage.
114 /** This baseclass implementation saves the autoWidgets, so be sure to call it if you use
115 * this feature in your settingsPage!
116 */
117 virtual void save();
118
119 //! Load settings from permanent storage, overriding any changes the user might have made in the dialog.
120 /** This baseclass implementation loads the autoWidgets, so be sure to call it if you use
121 * this feature in your settingsPage!
122 */
123 virtual void load();
124
125 //! Restore defaults, overriding any changes the user might have made in the dialog.
126 /** This baseclass implementation loads the defaults of the autoWidgets (if available), so be sure
127 * to call it if you use this feature in your settingsPage!
128 */
129 virtual void defaults();
130
131protected slots:
132 //! Calling this slot is equivalent to calling setChangedState(true).
133 inline void changed() { setChangedState(true); }
134
135 //! This should be called whenever the widget state changes from unchanged to change or the other way round.
136 void setChangedState(bool hasChanged = true);
137
138protected:
139 void initAutoWidgets();
140 virtual QVariant loadAutoWidgetValue(const QString &widgetName);
141 virtual void saveAutoWidgetValue(const QString &widgetName, const QVariant &value);
142
143signals:
144 //! Emitted whenever the widget state changes.
145 void changed(bool hasChanged);
146
147private slots:
148 // for auto stuff
149 void autoWidgetHasChanged();
150
151private:
152 void findAutoWidgets(QObject *parent, QObjectList *widgetList) const;
153 QByteArray autoWidgetPropertyName(QObject *widget) const;
154 QString autoWidgetSettingsKey(QObject *widget) const;
155
156 QString _category, _title;
157 bool _changed, _autoWidgetsChanged;
158 QObjectList _autoWidgets;
159};
160
161
162#endif
163