KItemViews

kwidgetitemdelegate.h
1/*
2 This file is part of the KDE project
3 SPDX-FileCopyrightText: 2007-2008 Rafael Fernández López <ereslibre@kde.org>
4 SPDX-FileCopyrightText: 2008 Kevin Ottens <ervin@kde.org>
5
6 SPDX-License-Identifier: LGPL-2.0-or-later
7*/
8
9#ifndef KWIDGETITEMDELEGATE_H
10#define KWIDGETITEMDELEGATE_H
11
12#include <QAbstractItemDelegate>
13#include <QEvent>
14#include <QList>
15#include <QPersistentModelIndex>
16#include <memory>
17
18#include <kitemviews_export.h>
19
20class QObject;
21class QPainter;
22class QStyleOption;
25class QItemSelection;
26
27class KWidgetItemDelegatePrivate;
28class KWidgetItemDelegatePool;
29
30/**
31 * @class KWidgetItemDelegate kwidgetitemdelegate.h KWidgetItemDelegate
32 *
33 * This class allows to create item delegates embedding simple widgets to interact
34 * with items. For instance you can add push buttons, line edits, etc. to your delegate
35 * and use them to modify the state of your model.
36 *
37 * Porting from KF5 to KF6:
38 *
39 * The signature of the virtual method
40 * KWidgetItemDelegate::updateItemWidgets(const QList<QWidget *>, const QStyleOptionViewItem &, const QPersistentModelIndex &) const
41 * was changed to ;
42 * KWidgetItemDelegate::updateItemWidgets(const QList<QWidget *> &, const QStyleOptionViewItem &, const QPersistentModelIndex &) const.
43 *
44 * @since 4.1
45 */
46class KITEMVIEWS_EXPORT KWidgetItemDelegate : public QAbstractItemDelegate
47{
48 Q_OBJECT
49
50public:
51 /**
52 * Creates a new ItemDelegate to be used with a given itemview.
53 *
54 * @param itemView the item view the new delegate will monitor
55 * @param parent the parent of this delegate
56 */
57 explicit KWidgetItemDelegate(QAbstractItemView *itemView, QObject *parent = nullptr);
58
59 /**
60 * Destroys an ItemDelegate.
61 */
63
64 /**
65 * Retrieves the item view this delegate is monitoring.
66 *
67 * @return the item view this delegate is monitoring
68 */
69 QAbstractItemView *itemView() const;
70
71 /**
72 * Retrieves the currently focused index. An invalid index if none is focused.
73 *
74 * @return the current focused index, or QPersistentModelIndex() if none is focused.
75 */
76 QPersistentModelIndex focusedIndex() const;
77
78 /**
79 * trigger a modelReset
80 */
81 void resetModel();
82
83protected:
84 /**
85 * Creates the list of widgets needed for an item.
86 *
87 * @note No initialization of the widgets is supposed to happen here.
88 * The widgets will be initialized based on needs for a given item.
89 *
90 * @note If you want to connect some widget signals to any slot, you should
91 * do it here.
92 *
93 * @param index the index to create widgets for
94 *
95 * @return the list of newly created widgets which will be used to interact with an item.
96 * @see updateItemWidgets()
97 */
98 virtual QList<QWidget *> createItemWidgets(const QModelIndex &index) const = 0;
99
100 /**
101 * Updates a list of widgets for its use inside of the delegate (painting or
102 * event handling).
103 *
104 * @note All the positioning and sizing should be done in item coordinates.
105 *
106 * @warning Do not make widget connections in here, since this method will
107 * be called very regularly.
108 *
109 * @param widgets the widgets to update
110 * @param option the current set of style options for the view.
111 * @param index the model index of the item currently manipulated.
112 */
113 virtual void updateItemWidgets(const QList<QWidget *> &widgets, const QStyleOptionViewItem &option, const QPersistentModelIndex &index) const = 0;
114
115 /**
116 * Sets the list of event @p types that a @p widget will block.
117 *
118 * Blocked events are not passed to the view. This way you can prevent an item
119 * from being selected when a button is clicked for instance.
120 *
121 * @param widget the widget which must block events
122 * @param types the list of event types the widget must block
123 */
124 void setBlockedEventTypes(QWidget *widget, const QList<QEvent::Type> &types) const;
125
126 /**
127 * Retrieves the list of blocked event types for the given widget.
128 *
129 * @param widget the specified widget.
130 *
131 * @return the list of blocked event types, can be empty if no events are blocked.
132 */
133 QList<QEvent::Type> blockedEventTypes(QWidget *widget) const;
134
135private:
136 //@cond PRIVATE
137 friend class KWidgetItemDelegatePool;
138 friend class KWidgetItemDelegateEventListener;
139 std::unique_ptr<class KWidgetItemDelegatePrivate> const d;
140
141 Q_PRIVATE_SLOT(d, void _k_slotRowsInserted(const QModelIndex &, int, int))
142 Q_PRIVATE_SLOT(d, void _k_slotRowsAboutToBeRemoved(const QModelIndex &, int, int))
143 Q_PRIVATE_SLOT(d, void _k_slotRowsRemoved(const QModelIndex &, int, int))
144 Q_PRIVATE_SLOT(d, void _k_slotDataChanged(const QModelIndex &, const QModelIndex &))
145 Q_PRIVATE_SLOT(d, void _k_slotLayoutChanged())
146 Q_PRIVATE_SLOT(d, void _k_slotModelReset())
147 Q_PRIVATE_SLOT(d, void _k_slotSelectionChanged(const QItemSelection &, const QItemSelection &))
148 //@endcond
149};
150
151#endif
This class allows to create item delegates embedding simple widgets to interact with items.
~KWidgetItemDelegate() override
Destroys an ItemDelegate.
virtual QList< QWidget * > createItemWidgets(const QModelIndex &index) const =0
Creates the list of widgets needed for an item.
virtual void updateItemWidgets(const QList< QWidget * > &widgets, const QStyleOptionViewItem &option, const QPersistentModelIndex &index) const =0
Updates a list of widgets for its use inside of the delegate (painting or event handling).
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