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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of Qt Designer. This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
#ifndef DESIGNERWIDGETITEM_H
#define DESIGNERWIDGETITEM_H
#include "shared_global_p.h"
#include <QtWidgets/qlayoutitem.h>
#include <QtCore/qobject.h>
QT_BEGIN_NAMESPACE
class QDesignerFormEditorInterface;
namespace qdesigner_internal {
// QDesignerWidgetItem: A Layout Item that is used for non-containerextension-
// containers (QFrame, etc) on Designer forms. It prevents its widget
// from being slammed to size 0 if the widget has no layout:
// Pre 4.5, this item ensured only that QWidgets and QFrames were not squeezed
// to size 0 since they have an invalid size hint when non-laid out.
// Since 4.5, the item is used for every non-containerextension-container.
// In case the container has itself a layout, it merely tracks the minimum
// size. If the container has no layout and is not subject to some stretch
// factor, it will return the last valid size. The effect is that after
// breaking a layout on a container within a layout, it just maintains its
// last size and is not slammed to 0,0. In addition, it can be resized.
// The class keeps track of the containing layout by tracking widget reparent
// and destroyed slots as Designer will for example re-create grid layouts to
// shrink them.
class QDESIGNER_SHARED_EXPORT QDesignerWidgetItem : public QObject, public QWidgetItemV2 {
Q_DISABLE_COPY_MOVE(QDesignerWidgetItem)
Q_OBJECT
public:
explicit QDesignerWidgetItem(const QLayout *containingLayout, QWidget *w, Qt::Orientations o = Qt::Horizontal|Qt::Vertical);
const QLayout *containingLayout() const;
inline QWidget *constWidget() const { return const_cast<QDesignerWidgetItem*>(this)->widget(); }
QSize minimumSize() const override;
QSize sizeHint() const override;
// Resize: Takes effect if the contained widget does not have a layout
QSize nonLaidOutMinSize() const;
void setNonLaidOutMinSize(const QSize &s);
QSize nonLaidOutSizeHint() const;
void setNonLaidOutSizeHint(const QSize &s);
// Check whether a QDesignerWidgetItem should be installed
static bool check(const QLayout *layout, QWidget *w, Qt::Orientations *ptrToOrientations = nullptr);
// Register itself using QLayoutPrivate's widget item factory method hook
static void install();
static void deinstall();
// Check for a non-container extension container
static bool isContainer(const QDesignerFormEditorInterface *core, QWidget *w);
static bool subjectToStretch(const QLayout *layout, QWidget *w);
bool eventFilter(QObject * watched, QEvent * event) override;
private slots:
void layoutChanged();
private:
void expand(QSize *s) const;
bool subjectToStretch() const;
const Qt::Orientations m_orientations;
mutable QSize m_nonLaidOutMinSize;
mutable QSize m_nonLaidOutSizeHint;
mutable const QLayout *m_cachedContainingLayout;
};
// Helper class that ensures QDesignerWidgetItem is installed while an
// instance is in scope.
class QDESIGNER_SHARED_EXPORT QDesignerWidgetItemInstaller {
Q_DISABLE_COPY_MOVE(QDesignerWidgetItemInstaller)
public:
QDesignerWidgetItemInstaller();
~QDesignerWidgetItemInstaller();
private:
static int m_instanceCount;
};
} // namespace qdesigner_internal
QT_END_NAMESPACE
#endif
|
