kdeplasma-addons/applets/showdesktop/showdesktop.cpp

   1 /*
   2  * Copyright 2008  Petri Damsten <damu@iki.fi>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This program 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
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "showdesktop.h"
  19 #include <plasma/widgets/iconwidget.h>
  20 #include <plasma/containment.h>
  21 #include <plasma/tooltipmanager.h>
  22 #include <KGlobalSettings>
  23 #include <KIcon>
  24 #include <kwindowsystem.h>
  25 #include <netwm.h>
  26 #include <KIconLoader>
  27 #include <QX11Info>
  28 #include <QTimer>
  29 #include <QGraphicsLinearLayout>
  30
  31 ShowDesktop::ShowDesktop(QObject *parent, const QVariantList &args)
  32     : Plasma::Applet(parent, args), m_wm2ShowingDesktop(false)
  33 #ifndef MINIMIZE_ONLY
  34       , m_down(false), m_goingDown(false)
  35 #endif
  36 {
  37     setAspectRatioMode(Plasma::ConstrainedSquare);
  38     int iconSize = IconSize(KIconLoader::Desktop);
  39     resize(iconSize * 2, iconSize * 2);
  40     setAcceptDrops(true);
  41     connect(&m_timer, SIGNAL(timeout()), this, SLOT(minimizeAll()));
  42 }
  43
  44 ShowDesktop::~ShowDesktop()
  45 {
  46 }
  47
  48 void ShowDesktop::init()
  49 {
  50     connect(this, SIGNAL(activate()), this, SLOT(minimizeAll()));
  51
  52     QGraphicsLinearLayout *layout = new QGraphicsLinearLayout(this);
  53     layout->setContentsMargins(0, 0, 0, 0);
  54     layout->setSpacing(0);
  55
  56     Plasma::IconWidget *icon = new Plasma::IconWidget(KIcon("user-desktop"), QString(), this);
  57     layout->addItem(icon);
  58     registerAsDragHandle(icon);
  59     connect(icon, SIGNAL(clicked()), this, SLOT(minimizeAll()));
  60
  61     Plasma::ToolTipContent toolTipData(i18n("Show the Desktop"),
  62                                        i18n("Minimize all open windows and show the Desktop"),
  63                                        icon->icon().pixmap(IconSize(KIconLoader::Desktop)));
  64     Plasma::ToolTipManager::self()->setContent(this, toolTipData);
  65
  66     NETRootInfo info(QX11Info::display(), NET::Supported);
  67     m_wm2ShowingDesktop = info.isSupported(NET::WM2ShowingDesktop);
  68
  69 #ifndef MINIMIZE_ONLY
  70     if (m_wm2ShowingDesktop) {
  71         connect(KWindowSystem::self(), SIGNAL(activeWindowChanged(WId)), this, SLOT(reset()));
  72     }
  73 #endif
  74
  75     connect(KGlobalSettings::self(), SIGNAL(iconChanged(int)),
  76         this, SLOT(iconSizeChanged(int)));
  77 }
  78
  79 void ShowDesktop::minimizeAll()
  80 {
  81     m_timer.stop();
  82     if (m_wm2ShowingDesktop) {
  83         NETRootInfo info(QX11Info::display(), 0);
  84 #ifndef MINIMIZE_ONLY
  85         m_down = !m_down;
  86         m_goingDown = m_down;
  87         info.setShowingDesktop(m_down);
  88         // NETRootInfo::showingDesktop() returns always false
  89         QTimer::singleShot(500, this, SLOT(delay()));
  90 #else
  91         info.setShowingDesktop(true);
  92 #endif
  93     }
  94 }
  95
  96 void ShowDesktop::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
  97 {
  98     m_timer.start(750);
  99     event->accept();
 100 }
 101
 102 void ShowDesktop::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
 103 {
 104     m_timer.stop();
 105 }
 106 #ifndef MINIMIZE_ONLY
 107
 108 void ShowDesktop::delay()
 109 {
 110     m_goingDown = false;
 111 }
 112
 113 void ShowDesktop::reset()
 114 {
 115     if (!m_goingDown) {
 116         m_down = false;
 117     }
 118 }
 119
 120 QSizeF ShowDesktop::sizeHint(Qt::SizeHint which, const QSizeF & constraint) const
 121 {
 122     if (which == Qt::PreferredSize) {
 123         int iconSize;
 124
 125         switch (formFactor()) {
 126             case Plasma::Planar:
 127             case Plasma::MediaCenter:
 128                 iconSize = IconSize(KIconLoader::Desktop);
 129                 break;
 130
 131             case Plasma::Horizontal:
 132             case Plasma::Vertical:
 133                 iconSize = IconSize(KIconLoader::Panel);
 134                 break;
 135         }
 136
 137         return QSizeF(iconSize, iconSize);
 138     }
 139
 140     return Plasma::Applet::sizeHint(which, constraint);
 141 }
 142
 143 void ShowDesktop::iconSizeChanged(int group)
 144 {
 145     if (group == KIconLoader::Desktop || group == KIconLoader::Panel) {
 146         updateGeometry();
 147     }
 148 }
 149
 150 #endif
 151
 152 #include "moc_showdesktop.cpp"