File: DragWidget.pm

package info (click to toggle)
qt4-perl 4.5~~svn1145508-2
  • links: PTS
  • area: main
  • in suites: squeeze
  • size: 5,144 kB
  • ctags: 5,947
  • sloc: perl: 29,224; cpp: 18,849; xml: 98; makefile: 91; sh: 4
file content (138 lines) | stat: -rw-r--r-- 3,614 bytes parent folder | download | duplicates (4)
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
135
136
137
138
package DragWidget;

use strict;
use warnings;
use QtCore4;
use QtGui4;
use QtCore4::isa qw( Qt::Widget );
use DragLabel;
use List::Util qw(max);

sub NEW
{
    my ($class, $parent) = @_;
    $class->SUPER::NEW($parent);
    my $dictionaryFile = Qt::File('words.txt');
    $dictionaryFile->open(Qt::IODevice::ReadOnly());
    my $inputStream = Qt::TextStream($dictionaryFile);

    my $x = 5;
    my $y = 5;

    while (!$inputStream->atEnd()) {
        my $word;
        no warnings qw(void);
        $inputStream >> Qt::String($word);
        use warnings;
        if ($word) {
            my $wordLabel = DragLabel($word, this);
            $wordLabel->move($x, $y);
            $wordLabel->show();
            $wordLabel->setAttribute(Qt::WA_DeleteOnClose());
            $x += $wordLabel->width() + 2;
            if ($x >= 195) {
                $x = 5;
                $y += $wordLabel->height() + 2;
            }
        }
    }

    my $newPalette = this->palette();
    $newPalette->setColor(Qt::Palette::Window(), Qt::Color(Qt::white()));
    this->setPalette($newPalette);

    this->setAcceptDrops(1);
    this->setMinimumSize(400, max(200, $y));
    this->setWindowTitle(this->tr('Draggable Text'));
}

sub dragEnterEvent
{
    my ($event) = @_;
    if ($event->mimeData()->hasText()) {
        my $children = this->children();
        if ($children && grep{ $_ eq $event->source } @{$children}) {
            $event->setDropAction(Qt::MoveAction());
            $event->accept();
        } else {
            $event->acceptProposedAction();
        }
    } else {
        $event->ignore();
    }
}

sub dropEvent
{
    my ($event) = @_;
    if ($event->mimeData()->hasText()) {
        my $mime = $event->mimeData();
        my @pieces = split /\s+/, $mime->text();
        my $position = $event->pos();
        my $hotSpot = Qt::Point();

        my @hotSpotPos = split / /, $mime->data('application/x-hotspot')->data();
        if (scalar @hotSpotPos == 2) {
            $hotSpot->setX($hotSpotPos[0]);
            $hotSpot->setY($hotSpotPos[1]);
        }

        foreach my $piece ( @pieces ) {
            my $newLabel = DragLabel($piece, this);
            $newLabel->move($position - $hotSpot);
            $newLabel->show();
            $newLabel->setAttribute(Qt::WA_DeleteOnClose());

            $position += Qt::Point($newLabel->width(), 0);
        }

        if ($event->source() == this) {
            $event->setDropAction(Qt::MoveAction());
            $event->accept();
        } else {
            $event->acceptProposedAction();
        }
    } else {
        $event->ignore();
    }
    foreach my $child ( @{this->children()} ) {
        if ($child->inherits('Qt::Widget')) {
            if (!$child->isVisible()) {
                $child->deleteLater();
            }
        }
    }
}

sub mousePressEvent
{
    my ($event) = @_;
    my $child = this->childAt($event->pos());
    if (!$child) {
        return;
    }

    my $hotSpot = $event->pos() - $child->pos();

    my $mimeData = Qt::MimeData();
    $mimeData->setText($child->text());
    $mimeData->setData('application/x-hotspot',
                       Qt::ByteArray( $hotSpot->x()
                           . ' ' . $hotSpot->y()) );

    my $pixmap = Qt::Pixmap($child->size());
    $child->render($pixmap);

    my $drag = Qt::Drag(this);
    $drag->setMimeData($mimeData);
    $drag->setPixmap($pixmap);
    $drag->setHotSpot($hotSpot);

    my $dropAction = $drag->exec(Qt::CopyAction() | Qt::MoveAction(), Qt::CopyAction());

    if ($dropAction == Qt::MoveAction()) {
        $child->close();
    }
}

1;