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 <KIconLoader>
  36 #include <KLineEdit>
  37 #include <KLocalizedString>
  38
  39 //Plasma
  40 #include <Plasma/Theme>
  41
  42 #include "ui/itemdelegate.h"
  43
  44 using namespace Kickoff;
  45
  46 class SearchBar::Private
  47 {
  48 public:
  49     Private() : editWidget(0), timer(0) {}
  50
  51     KLineEdit *editWidget;
  52     QLabel *searchLabel;
  53     QTimer *timer;
  54 };
  55
  56 SearchBar::SearchBar(QWidget *parent)
  57         : QWidget(parent)
  58         , d(new Private)
  59 {
  60     // timer for buffered updates
  61     d->timer = new QTimer(this);
  62     d->timer->setInterval(300);
  63     d->timer->setSingleShot(true);
  64     connect(d->timer, SIGNAL(timeout()), this, SLOT(updateTimerExpired()));
  65     connect(this, SIGNAL(startUpdateTimer()), d->timer, SLOT(start()));
  66
  67     // setup UI
  68     QHBoxLayout *layout = new QHBoxLayout;
  69     layout->setMargin(3);
  70     layout->setSpacing(0); // we do the spacing manually to line up with the views below
  71
  72     d->searchLabel = new QLabel(i18n("Search:"), this);
  73     QLabel *searchIcon = new QLabel(this);
  74
  75     QFileInfo fi(QDir(QDir::homePath()), ".face.icon");
  76     if (fi.exists()) {
  77         searchIcon->setPixmap(QPixmap(fi.absoluteFilePath()).scaled(KIconLoader::SizeMedium, KIconLoader::SizeMedium, Qt::KeepAspectRatio));
  78     } else {
  79         searchIcon->setPixmap(KIcon("system-search").pixmap(KIconLoader::SizeMedium, KIconLoader::SizeMedium));
  80     }
  81
  82     d->editWidget = new KLineEdit(this);
  83     d->editWidget->installEventFilter(this);
  84     d->editWidget->setClearButtonShown(true);
  85     connect(d->editWidget, SIGNAL(textChanged(QString)), this, SIGNAL(startUpdateTimer()));
  86
  87     //add arbitrary spacing
  88     layout->addSpacing(2);
  89     layout->addWidget(searchIcon);
  90     layout->addSpacing(5);
  91     layout->addWidget(d->searchLabel);
  92     layout->addSpacing(5);
  93     layout->addWidget(d->editWidget);
  94     setLayout(layout);
  95
  96     setFocusProxy(d->editWidget);
  97
  98     updateThemedPalette();
  99     connect(Plasma::Theme::defaultTheme(), SIGNAL(themeChanged()),
 100             this, SLOT(updateThemedPalette()));
 101 }
 102
 103 void SearchBar::updateThemedPalette()
 104 {
 105     QColor color = Plasma::Theme::defaultTheme()->color(Plasma::Theme::TextColor);
 106     QPalette p = d->searchLabel->palette();
 107     p.setColor(QPalette::Normal, QPalette::WindowText, color);
 108     p.setColor(QPalette::Inactive, QPalette::WindowText, color);
 109     d->searchLabel->setPalette(p);
 110 }
 111
 112 void SearchBar::updateTimerExpired()
 113 {
 114     emit queryChanged(d->editWidget->text());
 115 }
 116
 117 SearchBar::~SearchBar()
 118 {
 119     delete d;
 120 }
 121
 122 bool SearchBar::eventFilter(QObject *watched, QEvent *event)
 123 {
 124     // left and right arrow key presses in the search edit when the
 125     // edit is empty are propagated up to the parent widget
 126     // this allows views in the Launcher to use left and right arrows for
 127     // navigation whilst the search bar still has the focus
 128     if (watched == d->editWidget && event->type() == QEvent::KeyPress) {
 129         QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
 130         if ((keyEvent->key() == Qt::Key_Left || keyEvent->key() == Qt::Key_Right) &&
 131                 d->editWidget->text().isEmpty()) {
 132             QCoreApplication::sendEvent(this, event);
 133             return true;
 134         }
 135     }
 136     return false;
 137 }
 138
 139 void SearchBar::clear()
 140 {
 141     d->editWidget->clear();
 142 }
 143
 144 #include "searchbar.moc"