workspace/plasma/applets/kickoff/ui/searchbar.cpp

   1 /*
   2     Copyright 2007 Robert Knight <robertknight@gmail.com>
   3
   4     This library is free software; you can redistribute it and/or
   5     modify it under the terms of the GNU Library General Public
   6     License as published by the Free Software Foundation; either
   7     version 2 of the License, or (at your option) any later version.
   8
   9     This library is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12     Library General Public License for more details.
  13
  14     You should have received a copy of the GNU Library General Public License
  15     along with this library; see the file COPYING.LIB.  If not, write to
  16     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17     Boston, MA 02110-1301, USA.
  18 */
  19
  20 // Own
  21 #include "ui/searchbar.h"
  22
  23 // Qt
  24 #include <QCoreApplication>
  25 #include <QDir>
  26 #include <QFileInfo>
  27 #include <QHBoxLayout>
  28 #include <QKeyEvent>
  29 #include <QLabel>
  30 #include <QPainter>
  31 #include <QTimer>
  32
  33 // KDE
  34 #include <KIcon>
  35 #include <KLineEdit>
  36 #include <KLocalizedString>
  37
  38 #include "ui/itemdelegate.h"
  39
  40 using namespace Kickoff;
  41
  42 class SearchBar::Private
  43 {
  44 public:
  45     Private() : editWidget(0),timer(0) {}
  46
  47     KLineEdit *editWidget;
  48     QTimer *timer;
  49 };
  50
  51 SearchBar::SearchBar(QWidget *parent)
  52  : QWidget(parent)
  53  , d(new Private)
  54 {
  55     // timer for buffered updates
  56     d->timer = new QTimer(this);
  57     d->timer->setInterval(300);
  58     d->timer->setSingleShot(true);
  59     connect(d->timer,SIGNAL(timeout()),this,SLOT(updateTimerExpired()));
  60     connect(this,SIGNAL(startUpdateTimer()),d->timer,SLOT(start()));
  61
  62     // setup UI
  63     QHBoxLayout *layout = new QHBoxLayout;
  64     layout->setMargin(3);
  65     layout->setSpacing(0); // we do the spacing manually to line up with the views below
  66
  67     QLabel *searchLabel = new QLabel(i18n("Search:"),this);
  68     QLabel *searchIcon = new QLabel(this);
  69
  70     QFileInfo fi(QDir(QDir::homePath()), ".face.icon");
  71     if (fi.exists()) {
  72         searchIcon->setPixmap(QPixmap(fi.absoluteFilePath()).scaled(ItemDelegate::ICON_SIZE, ItemDelegate::ICON_SIZE));
  73     }
  74     else {
  75         searchIcon->setPixmap(KIcon("system-search").pixmap(ItemDelegate::ICON_SIZE, ItemDelegate::ICON_SIZE));
  76     }
  77
  78     d->editWidget = new KLineEdit(this);
  79     d->editWidget->installEventFilter(this);
  80     d->editWidget->setClearButtonShown(true);
  81     connect(d->editWidget,SIGNAL(textChanged(QString)),this,SIGNAL(startUpdateTimer()));
  82
  83     layout->addSpacing(ItemDelegate::ITEM_LEFT_MARGIN - 3);
  84     layout->addWidget(searchIcon);
  85     layout->addSpacing(ItemDelegate::ICON_TEXT_MARGIN);
  86     layout->addWidget(searchLabel);
  87     layout->addWidget(d->editWidget);
  88     setLayout(layout);
  89
  90     setFocusProxy(d->editWidget);
  91 }
  92
  93 void SearchBar::updateTimerExpired()
  94 {
  95     emit queryChanged(d->editWidget->text());
  96 }
  97
  98 SearchBar::~SearchBar()
  99 {
 100     delete d;
 101 }
 102
 103 bool SearchBar::eventFilter(QObject *watched,QEvent *event)
 104 {
 105     // left and right arrow key presses in the search edit when the
 106     // edit is empty are propagated up to the parent widget
 107     // this allows views in the Launcher to use left and right arrows for
 108     // navigation whilst the search bar still has the focus
 109     if (watched == d->editWidget && event->type() == QEvent::KeyPress) {
 110         QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
 111         if ((keyEvent->key() == Qt::Key_Left || keyEvent->key() == Qt::Key_Right) &&
 112             d->editWidget->text().isEmpty()) {
 113             QCoreApplication::sendEvent(this,event);
 114             return true;
 115         }
 116     }
 117     return false;
 118 }
 119
 120 void SearchBar::paintEvent(QPaintEvent *event)
 121 {
 122     Q_UNUSED(event);
 123     QPainter p(this);
 124     p.setPen(QPen(palette().mid(), 1));
 125     p.drawLine(0, height() - 1, width() - 1, height() - 1);
 126 }
 127
 128 void SearchBar::clear()
 129 {
 130     d->editWidget->clear();
 131 }
 132
 133 #include "searchbar.moc"