workspace/kcontrol/randr/collapsiblewidget.cpp

   1 /*
   2    This file is part of the KDE libraries
   3    Copyright (C) 2005 Daniel Molkentin <molkentin@kde.org>
   4
   5    This library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public
   7    License version 2 as published by the Free Software Foundation.
   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 #include <QtGui/QtGui>
  21 #include <QTimeLine>
  22 #include <collapsiblewidget.h>
  23
  24 /******************************************************************
  25  * Helper classes
  26  *****************************************************************/
  27
  28 ClickableLabel::ClickableLabel( QWidget* parent )
  29     : QLabel( parent )
  30 {
  31 }
  32
  33 ClickableLabel::~ClickableLabel()
  34 {
  35 }
  36
  37 void ClickableLabel::mouseReleaseEvent( QMouseEvent *e )
  38 {
  39     Q_UNUSED( e );
  40     emit clicked();
  41 }
  42
  43 ArrowButton::ArrowButton( QWidget *parent )
  44 : QAbstractButton( parent )
  45 {
  46 }
  47
  48
  49 ArrowButton::~ArrowButton()
  50 {
  51 }
  52
  53 void ArrowButton::paintEvent( QPaintEvent *event )
  54 {
  55   Q_UNUSED( event );
  56   QPainter p( this );
  57   QStyleOption opt;
  58   int h = sizeHint().height();
  59   opt.rect = QRect(0,( height()- h )/2, h, h);
  60   opt.palette = palette();
  61   opt.state = QStyle::State_Children;
  62   if (isChecked())
  63     opt.state |= QStyle::State_Open;
  64
  65   style()->drawPrimitive(QStyle::PE_IndicatorBranch, &opt, &p);
  66   p.end();
  67 }
  68
  69
  70 /******************************************************************
  71  * Private classes
  72  *****************************************************************/
  73
  74 class CollapsibleWidget::Private
  75 {
  76   public:
  77     QGridLayout    *gridLayout;
  78     QWidget        *innerWidget;
  79     ClickableLabel *label;
  80     ArrowButton    *colButton;
  81     QTimeLine      *timeline;
  82     QWidget        *expander;
  83     QVBoxLayout    *expanderLayout;
  84 };
  85
  86 class SettingsContainer::Private
  87 {
  88   public:
  89     QVBoxLayout *layout;
  90 };
  91
  92 /******************************************************************
  93  * Implementation
  94  *****************************************************************/
  95
  96 SettingsContainer::SettingsContainer(QWidget *parent)
  97  : QScrollArea( parent ), d(new SettingsContainer::Private)
  98 {
  99   QWidget *w = new QWidget;
 100   QVBoxLayout *helperLay = new QVBoxLayout(w);
 101   d->layout = new QVBoxLayout;
 102   helperLay->addLayout( d->layout );
 103   helperLay->addStretch(1);
 104   setWidget(w);
 105   setWidgetResizable(true);
 106 }
 107
 108 SettingsContainer::~SettingsContainer()
 109 {
 110   delete d;
 111 }
 112
 113 CollapsibleWidget* SettingsContainer::insertWidget( QWidget *w, const QString& name )
 114 {
 115    if (w && w->layout()) {
 116      QLayout *lay = w->layout();
 117      lay->setMargin(2);
 118      lay->setSpacing(0);
 119    }
 120
 121    CollapsibleWidget *cw = new CollapsibleWidget( name );
 122    d->layout->addWidget( cw );
 123    cw->setInnerWidget( w );
 124    return cw;
 125 }
 126
 127 CollapsibleWidget::CollapsibleWidget(QWidget *parent)
 128  : QWidget(parent), d(new CollapsibleWidget::Private)
 129 {
 130   init();
 131 }
 132 CollapsibleWidget::CollapsibleWidget(const QString& caption, QWidget *parent)
 133  : QWidget(parent), d(new CollapsibleWidget::Private)
 134 {
 135   init();
 136   setCaption(caption);
 137 }
 138
 139 void CollapsibleWidget::init()
 140 {
 141   d->expander = 0;
 142   d->expanderLayout = 0;
 143   d->timeline = new QTimeLine( 150, this );
 144   d->timeline->setCurveShape( QTimeLine::EaseInOutCurve );
 145   connect( d->timeline, SIGNAL(valueChanged(qreal)),
 146            this, SLOT(animateCollapse(qreal)) );
 147
 148   d->innerWidget = 0;
 149   d->gridLayout = new QGridLayout( this );
 150   d->gridLayout->setMargin(0);
 151
 152   d->colButton = new ArrowButton;
 153   d->colButton->setCheckable(true);
 154
 155   d->label = new ClickableLabel;
 156   d->label->setSizePolicy(QSizePolicy::MinimumExpanding,
 157                         QSizePolicy::Preferred);
 158
 159   d->gridLayout->addWidget(d->colButton, 1, 1);
 160   d->gridLayout->addWidget(d->label, 1, 2);
 161
 162
 163   connect(d->label, SIGNAL(clicked()),
 164           d->colButton, SLOT(click()));
 165
 166   connect(d->colButton, SIGNAL(toggled(bool)),
 167           SLOT(setExpanded(bool)));
 168
 169   setExpanded(false);
 170   setEnabled(false);
 171 }
 172
 173 CollapsibleWidget::~CollapsibleWidget()
 174 {
 175   delete d;
 176 }
 177
 178 QWidget* CollapsibleWidget::innerWidget() const
 179 {
 180   return d->innerWidget;
 181 }
 182
 183 #define SIMPLE
 184
 185 void CollapsibleWidget::setInnerWidget(QWidget *w)
 186 {
 187   if (!w) {
 188     return;
 189   }
 190
 191   d->innerWidget = w;
 192
 193 #ifdef SIMPLE
 194   if ( !isExpanded() ) {
 195       d->innerWidget->hide();
 196   }
 197   d->gridLayout->addWidget( d->innerWidget, 2, 2 );
 198   d->gridLayout->setRowStretch( 2, 1 );
 199 #else
 200   if ( !d->expander ) {
 201       d->expander = new QWidget( this );
 202       d->gridLayout->addWidget( d->expander, 2, 2 );
 203       d->gridLayout->setRowStretch( 2, 1 );
 204       d->expanderLayout = new QVBoxLayout( d->expander );
 205       d->expanderLayout->setMargin( 0 );
 206       d->expanderLayout->setSpacing( 0 );
 207       d->expander->setFixedHeight( 0 );
 208   }
 209
 210   d->innerWidget->setParent( d->expander );
 211   d->innerWidget->show();
 212   d->expanderLayout->addWidget( d->innerWidget );
 213 #endif
 214
 215   setEnabled( true );
 216
 217   if ( isExpanded() ) {
 218     setExpanded( true );
 219   }
 220 }
 221
 222 void CollapsibleWidget::setCaption(const QString& caption)
 223 {
 224   d->label->setText(QString("<b>%1</b>").arg(caption));
 225 }
 226
 227 QString CollapsibleWidget::caption() const
 228 {
 229   return d->label->text();
 230 }
 231
 232
 233 void CollapsibleWidget::setExpanded(bool expanded)
 234 {
 235   if ( !d->innerWidget ) {
 236     return;
 237   }
 238
 239 #ifdef SIMPLE
 240   if ( !expanded ) {
 241     d->innerWidget->setVisible( false );
 242   }
 243 #else
 244   if ( expanded ) {
 245       d->expander->setVisible( true );
 246   }
 247   d->innerWidget->setVisible( expanded );
 248 #endif
 249   d->colButton->setChecked( expanded );
 250   d->timeline->setDirection( expanded ? QTimeLine::Forward
 251                                       : QTimeLine::Backward );
 252   if (d->timeline->state() != QTimeLine::Running)
 253       d->timeline->start();
 254 }
 255
 256 void CollapsibleWidget::animateCollapse( qreal showAmount )
 257 {
 258   int pixels = d->innerWidget->sizeHint().height() * showAmount;
 259   d->gridLayout->setRowMinimumHeight( 2, pixels );
 260
 261 #ifdef SIMPLE
 262   d->gridLayout->setRowMinimumHeight( 2, pixels );
 263
 264   if ( showAmount == 1 ) {
 265       d->innerWidget->setVisible( true );
 266   }
 267 #else
 268   d->expander->setFixedHeight( pixels );
 269 #endif
 270 }
 271
 272 bool CollapsibleWidget::isExpanded() const
 273 {
 274   return d->colButton->isChecked();
 275 }
 276
 277
 278 #include "collapsiblewidget.moc"