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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
47 QT_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 */
QColumnViewGrip(QWidget * parent)67 QColumnViewGrip::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 */
QColumnViewGrip(QColumnViewGripPrivate & dd,QWidget * parent,Qt::WindowFlags f)78 QColumnViewGrip::QColumnViewGrip(QColumnViewGripPrivate & dd, QWidget *parent, Qt::WindowFlags f)
79 : QWidget(dd, parent, f)
80 {
81 }
82
83 /*!
84 Destroys the view.
85 */
~QColumnViewGrip()86 QColumnViewGrip::~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 */
moveGrip(int offset)94 int 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(parentWidget->minimumWidth(), newWidth);
106 parentWidget->resize(newWidth, 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(realOffset);
113 if (isRightToLeft())
114 realOffset = -1 * (oldX - parentWidget->x());
115 return realOffset;
116 }
117
118 /*!
119 \reimp
120 */
paintEvent(QPaintEvent * event)121 void QColumnViewGrip::paintEvent(QPaintEvent *event)
122 {
123 QPainter painter(this);
124 QStyleOption opt;
125 opt.initFrom(this);
126 style()->drawControl(QStyle::CE_ColumnViewGrip, &opt, &painter, this);
127 event->accept();
128 }
129
130 /*!
131 \reimp
132 Resize the parent window to the sizeHint
133 */
mouseDoubleClickEvent(QMouseEvent * event)134 void 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 */
mousePressEvent(QMouseEvent * event)149 void 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 */
mouseMoveEvent(QMouseEvent * event)160 void 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 */
mouseReleaseEvent(QMouseEvent * event)172 void QColumnViewGrip::mouseReleaseEvent(QMouseEvent *event)
173 {
174 Q_D(QColumnViewGrip);
175 d->originalXLocation = -1;
176 event->accept();
177 }
178
179 /*
180 * private object implementation
181 */
QColumnViewGripPrivate()182 QColumnViewGripPrivate::QColumnViewGripPrivate()
183 : QWidgetPrivate(),
184 originalXLocation(-1)
185 {
186 }
187
188 QT_END_NAMESPACE
189
190 #include "moc_qcolumnviewgrip_p.cpp"
191