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50
51 /*
52 finalwidget.cpp
53
54 A widget to display an image and a label containing a description.
55 */
56
57 #include <QtGui>
58 #include "finalwidget.h"
59
FinalWidget(QWidget * parent,const QString & name,const QSize & labelSize)60 FinalWidget::FinalWidget(QWidget *parent, const QString &name,
61 const QSize &labelSize)
62 : QFrame(parent)
63 {
64 hasImage = false;
65 imageLabel = new QLabel;
66 imageLabel->setFrameShadow(QFrame::Sunken);
67 imageLabel->setFrameShape(QFrame::StyledPanel);
68 imageLabel->setMinimumSize(labelSize);
69 nameLabel = new QLabel(name);
70
71 QVBoxLayout *layout = new QVBoxLayout;
72 layout->addWidget(imageLabel, 1);
73 layout->addWidget(nameLabel, 0);
74 setLayout(layout);
75 }
76
77 /*!
78 If the mouse moves far enough when the left mouse button is held down,
79 start a drag and drop operation.
80 */
81
mouseMoveEvent(QMouseEvent * event)82 void FinalWidget::mouseMoveEvent(QMouseEvent *event)
83 {
84 if (!(event->buttons() & Qt::LeftButton))
85 return;
86 if ((event->pos() - dragStartPosition).manhattanLength()
87 < QApplication::startDragDistance())
88 return;
89 if (!hasImage)
90 return;
91
92 QDrag *drag = new QDrag(this);
93 QMimeData *mimeData = new QMimeData;
94
95 //! [0]
96 QByteArray output;
97 QBuffer outputBuffer(&output);
98 outputBuffer.open(QIODevice::WriteOnly);
99 imageLabel->pixmap()->toImage().save(&outputBuffer, "PNG");
100 mimeData->setData("image/png", output);
101 //! [0]
102 /*
103 //! [1]
104 mimeData->setImageData(QVariant(*imageLabel->pixmap()));
105 //! [1]
106 */
107 drag->setMimeData(mimeData);
108 drag->setPixmap(imageLabel->pixmap()->scaled(64, 64, Qt::KeepAspectRatio));
109 //! [2]
110 drag->setHotSpot(QPoint(drag->pixmap().width()/2,
111 drag->pixmap().height()));
112 //! [2]
113
114 drag->start();
115 }
116
117 /*!
118 Check for left mouse button presses in order to enable drag and drop.
119 */
120
mousePressEvent(QMouseEvent * event)121 void FinalWidget::mousePressEvent(QMouseEvent *event)
122 {
123 if (event->button() == Qt::LeftButton)
124 dragStartPosition = event->pos();
125 }
126
pixmap() const127 const QPixmap* FinalWidget::pixmap() const
128 {
129 return imageLabel->pixmap();
130 }
131
setPixmap(const QPixmap & pixmap)132 void FinalWidget::setPixmap(const QPixmap &pixmap)
133 {
134 imageLabel->setPixmap(pixmap);
135 hasImage = true;
136 }
137