1// Copyright (C) 2020 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#ifndef QCOLUMNVIEW_P_H
5#define QCOLUMNVIEW_P_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is not part of the Qt API. It exists for the convenience
12// of other Qt classes. This header file may change from version to
13// version without notice, or even be removed.
14//
15// We mean it.
16//
17
18#include <QtWidgets/private/qtwidgetsglobal_p.h>
19#include "qcolumnview.h"
20
21#include <private/qabstractitemview_p.h>
22
23#include <QtCore/qabstractitemmodel.h>
24#if QT_CONFIG(animation)
25#include <QtCore/qpropertyanimation.h>
26#endif
27#include <QtWidgets/qabstractitemdelegate.h>
28#include <QtWidgets/qabstractitemview.h>
29#include <QtWidgets/qstyleditemdelegate.h>
30#include <qlistview.h>
31#include <qevent.h>
32#include <qscrollbar.h>
33
34#include <vector>
35
36QT_REQUIRE_CONFIG(columnview);
37
38QT_BEGIN_NAMESPACE
39
40class QColumnViewPreviewColumn : public QAbstractItemView {
41
42public:
43 explicit QColumnViewPreviewColumn(QWidget *parent) : QAbstractItemView(parent), previewWidget(nullptr) {
44 }
45
46 void setPreviewWidget(QWidget *widget) {
47 previewWidget = widget;
48 setMinimumWidth(previewWidget->minimumWidth());
49 }
50
51 void resizeEvent(QResizeEvent * event) override{
52 if (!previewWidget)
53 return;
54 previewWidget->resize(
55 w: qMax(a: previewWidget->minimumWidth(), b: event->size().width()),
56 h: previewWidget->height());
57 QSize p = viewport()->size();
58 QSize v = previewWidget->size();
59 horizontalScrollBar()->setRange(min: 0, max: v.width() - p.width());
60 horizontalScrollBar()->setPageStep(p.width());
61 verticalScrollBar()->setRange(min: 0, max: v.height() - p.height());
62 verticalScrollBar()->setPageStep(p.height());
63
64 QAbstractScrollArea::resizeEvent(event);
65 }
66
67 void scrollContentsBy(int dx, int dy) override
68 {
69 if (!previewWidget)
70 return;
71 scrollDirtyRegion(dx, dy);
72 viewport()->scroll(dx, dy);
73
74 QAbstractItemView::scrollContentsBy(dx, dy);
75 }
76
77 QRect visualRect(const QModelIndex &) const override
78 {
79 return QRect();
80 }
81 void scrollTo(const QModelIndex &, ScrollHint) override
82 {
83 }
84 QModelIndex indexAt(const QPoint &) const override
85 {
86 return QModelIndex();
87 }
88 QModelIndex moveCursor(CursorAction, Qt::KeyboardModifiers) override
89 {
90 return QModelIndex();
91 }
92 int horizontalOffset () const override {
93 return 0;
94 }
95 int verticalOffset () const override {
96 return 0;
97 }
98 QRegion visualRegionForSelection(const QItemSelection &) const override
99 {
100 return QRegion();
101 }
102 bool isIndexHidden(const QModelIndex &) const override
103 {
104 return false;
105 }
106 void setSelection(const QRect &, QItemSelectionModel::SelectionFlags) override
107 {
108 }
109private:
110 QWidget *previewWidget;
111};
112
113class Q_AUTOTEST_EXPORT QColumnViewPrivate : public QAbstractItemViewPrivate
114{
115 Q_DECLARE_PUBLIC(QColumnView)
116
117public:
118 QColumnViewPrivate();
119 ~QColumnViewPrivate();
120 void initialize();
121 void clearConnections();
122
123 QAbstractItemView *createColumn(const QModelIndex &index, bool show);
124
125 void updateScrollbars();
126 void closeColumns(const QModelIndex &parent = QModelIndex(), bool build = false);
127 void disconnectView(QAbstractItemView *view);
128 void doLayout();
129 void setPreviewWidget(QWidget *widget);
130 void checkColumnCreation(const QModelIndex &parent);
131
132
133 void gripMoved(int offset);
134 void changeCurrentColumn();
135 void clicked(const QModelIndex &index);
136 void columnsInserted(const QModelIndex &parent, int start, int end) override;
137
138 QList<QAbstractItemView*> columns;
139 QList<int> columnSizes; // used during init and corner moving
140 bool showResizeGrips;
141 int offset;
142#if QT_CONFIG(animation)
143 QPropertyAnimation currentAnimation;
144 QMetaObject::Connection animationConnection;
145#endif
146 std::vector<QMetaObject::Connection> gripConnections;
147 using ViewConnections = std::vector<QMetaObject::Connection>;
148 QHash<QAbstractItemView *, ViewConnections> viewConnections;
149
150 QWidget *previewWidget;
151 QAbstractItemView *previewColumn;
152};
153
154/*!
155 * This is a delegate that will paint the triangle
156 */
157class QColumnViewDelegate : public QStyledItemDelegate
158{
159
160public:
161 explicit QColumnViewDelegate(QObject *parent = nullptr) : QStyledItemDelegate(parent) {}
162 ~QColumnViewDelegate() {}
163
164 void paint(QPainter *painter,
165 const QStyleOptionViewItem &option,
166 const QModelIndex &index) const override;
167};
168
169QT_END_NAMESPACE
170
171#endif //QCOLUMNVIEW_P_H
172

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source code of qtbase/src/widgets/itemviews/qcolumnview_p.h