1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/***************************************************************************
* Copyright (C) 2008 by Peter Penz <[email protected]> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
***************************************************************************/
#ifndef KFILEPREVIEWGENERATOR_H
#define KFILEPREVIEWGENERATOR_H
#include <QObject>
class AbstractViewAdapter;
class KDirModel;
class QAbstractItemView;
class QAbstractProxyModel;
/**
* @brief Generates previews for files of an item view.
*
* Per default a preview is generated for each item.
* Additionally the clipboard is checked for cut items.
* The icon state for cut items gets dimmed automatically.
*
* The following strategy is used when creating previews:
* - The previews for currently visible items are created before
* the previews for invisible items.
* - If the user changes the visible area by using the scrollbars,
* all pending previews get paused. As soon as the user stays
* on the same position for a short delay, the previews are
* resumed. Also in this case the previews for the visible items
* are generated first.
*/
class KFilePreviewGenerator : public QObject
{
Q_OBJECT
public:
/**
* @param parent Item view containing the file items where previews should
* be generated. It is mandatory that the item view specifies
* an icon size by QAbstractItemView::setIconSize(), otherwise
* no previews will be generated.
* @param model Model of the item view.
*/
KFilePreviewGenerator(QAbstractItemView* parent, QAbstractProxyModel* model);
/** @internal */
KFilePreviewGenerator(AbstractViewAdapter* parent, QAbstractProxyModel* model);
virtual ~KFilePreviewGenerator();
/**
* If \a show is set to true, a preview is generated for each item. If \a show
* is false, the MIME type icon of the item is shown instead. Per default showing
* the preview is turned on. Note that it is mandatory that the item view
* specifies an icon size by QAbstractItemView::setIconSize(), otherwise
* KFilePreviewGenerator::showPreview() will always return false.
*/
void setShowPreview(bool show);
bool showPreview() const;
/**
* Updates the previews for all already available items. Usually it is only
* necessary to invoke this method when the icon size of the abstract item view
* has been changed by QAbstractItemView::setIconSize().
*/
void updatePreviews();
/** Cancels all pending previews. */
void cancelPreviews();
private:
class Private;
Private* const d; /// @internal
Q_DISABLE_COPY(KFilePreviewGenerator)
Q_PRIVATE_SLOT(d, void generatePreviews(const KFileItemList&))
Q_PRIVATE_SLOT(d, void addToPreviewQueue(const KFileItem&, const QPixmap&))
Q_PRIVATE_SLOT(d, void slotPreviewJobFinished(KJob*))
Q_PRIVATE_SLOT(d, void updateCutItems())
Q_PRIVATE_SLOT(d, void dispatchPreviewQueue())
Q_PRIVATE_SLOT(d, void pausePreviews())
Q_PRIVATE_SLOT(d, void resumePreviews())
};
#endif
|
