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39
40#include "qcolumnviewgrip_p.h"
41#include <qstyleoption.h>
42#include <qpainter.h>
43#include <qbrush.h>
44#include <qevent.h>
45#include <qdebug.h>
46
47QT_BEGIN_NAMESPACE
48
49/*
50 \internal
51 class QColumnViewGrip
52
53 QColumnViewGrip is created to go inside QAbstractScrollArea's corner.
54 When the mouse it moved it will resize the scroll area and emit's a signal.
55 */
56
57/*
58 \internal
59 \fn void QColumnViewGrip::gripMoved()
60 Signal that is emitted when the grip moves the parent widget.
61 */
62
63/*!
64 Creates a new QColumnViewGrip with the given \a parent to view a model.
65 Use setModel() to set the model.
66*/
67QColumnViewGrip::QColumnViewGrip(QWidget *parent)
68 : QWidget(*new QColumnViewGripPrivate, parent, { })
69{
70#ifndef QT_NO_CURSOR
71 setCursor(Qt::SplitHCursor);
72#endif
73}
74
75/*!
76 \internal
77*/
78QColumnViewGrip::QColumnViewGrip(QColumnViewGripPrivate & dd, QWidget *parent, Qt::WindowFlags f)
79: QWidget(dd, parent, f)
80{
81}
82
83/*!
84 Destroys the view.
85*/
86QColumnViewGrip::~QColumnViewGrip()
87{
88}
89
90/*!
91 Attempt to resize the parent object by \a offset
92 returns the amount of offset that it was actually able to resized
93*/
94int QColumnViewGrip::moveGrip(int offset)
95{
96 QWidget *parentWidget = (QWidget*)parent();
97
98 // first resize the parent
99 int oldWidth = parentWidget->width();
100 int newWidth = oldWidth;
101 if (isRightToLeft())
102 newWidth -= offset;
103 else
104 newWidth += offset;
105 newWidth = qMax(a: parentWidget->minimumWidth(), b: newWidth);
106 parentWidget->resize(w: newWidth, h: parentWidget->height());
107
108 // Then have the view move the widget
109 int realOffset = parentWidget->width() - oldWidth;
110 int oldX = parentWidget->x();
111 if (realOffset != 0)
112 emit gripMoved(offset: realOffset);
113 if (isRightToLeft())
114 realOffset = -1 * (oldX - parentWidget->x());
115 return realOffset;
116}
117
118/*!
119 \reimp
120*/
121void QColumnViewGrip::paintEvent(QPaintEvent *event)
122{
123 QPainter painter(this);
124 QStyleOption opt;
125 opt.initFrom(w: this);
126 style()->drawControl(element: QStyle::CE_ColumnViewGrip, opt: &opt, p: &painter, w: this);
127 event->accept();
128}
129
130/*!
131 \reimp
132 Resize the parent window to the sizeHint
133*/
134void QColumnViewGrip::mouseDoubleClickEvent(QMouseEvent *event)
135{
136 Q_UNUSED(event);
137 QWidget *parentWidget = (QWidget*)parent();
138 int offset = parentWidget->sizeHint().width() - parentWidget->width();
139 if (isRightToLeft())
140 offset *= -1;
141 moveGrip(offset);
142 event->accept();
143}
144
145/*!
146 \reimp
147 Begin watching for mouse movements
148*/
149void QColumnViewGrip::mousePressEvent(QMouseEvent *event)
150{
151 Q_D(QColumnViewGrip);
152 d->originalXLocation = event->globalX();
153 event->accept();
154}
155
156/*!
157 \reimp
158 Calculate the movement of the grip and moveGrip() and emit gripMoved
159*/
160void QColumnViewGrip::mouseMoveEvent(QMouseEvent *event)
161{
162 Q_D(QColumnViewGrip);
163 int offset = event->globalX() - d->originalXLocation;
164 d->originalXLocation = moveGrip(offset) + d->originalXLocation;
165 event->accept();
166}
167
168/*!
169 \reimp
170 Stop watching for mouse movements
171*/
172void QColumnViewGrip::mouseReleaseEvent(QMouseEvent *event)
173{
174 Q_D(QColumnViewGrip);
175 d->originalXLocation = -1;
176 event->accept();
177}
178
179/*
180 * private object implementation
181 */
182QColumnViewGripPrivate::QColumnViewGripPrivate()
183: QWidgetPrivate(),
184originalXLocation(-1)
185{
186}
187
188QT_END_NAMESPACE
189
190#include "moc_qcolumnviewgrip_p.cpp"
191

source code of qtbase/src/widgets/itemviews/qcolumnviewgrip.cpp