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    41 

    42 #include <QtGui>

    43 

    44 #include "dialog.h"

    45 

    46 Dialog::Dialog(QWidget *parent)

    47     : QDialog(parent)

    48 {

    49     createRotableGroupBox();

    50     createOptionsGroupBox();

    51     createButtonBox();

    52 

    53     mainLayout = new QGridLayout;

    54     mainLayout->addWidget(rotableGroupBox, 0, 0);

    55     mainLayout->addWidget(optionsGroupBox, 1, 0);

    56     mainLayout->addWidget(buttonBox, 2, 0);

    57     setLayout(mainLayout);

    58 

    59     mainLayout->setSizeConstraint(QLayout::SetMinimumSize);

    60 

    61     setWindowTitle(tr("Dynamic Layouts"));

    62 }

    63 

    64 void Dialog::buttonsOrientationChanged(int index)

    65 {

    66     mainLayout->setSizeConstraint(QLayout::SetNoConstraint);

    67     setMinimumSize(0, 0);

    68 

    69     Qt::Orientation orientation = Qt::Orientation(

    70             buttonsOrientationComboBox->itemData(index).toInt());

    71 

    72     if (orientation == buttonBox->orientation())

    73         return;

    74 

    75     mainLayout->removeWidget(buttonBox);

    76 

    77     int spacing = mainLayout->spacing();

    78 

    79     QSize oldSizeHint = buttonBox->sizeHint() + QSize(spacing, spacing);

    80     buttonBox->setOrientation(orientation);

    81     QSize newSizeHint = buttonBox->sizeHint() + QSize(spacing, spacing);

    82 

    83     if (orientation == Qt::Horizontal) {

    84         mainLayout->addWidget(buttonBox, 2, 0);

    85         resize(size() + QSize(-oldSizeHint.width(), newSizeHint.height()));

    86     } else {

    87         mainLayout->addWidget(buttonBox, 0, 3, 2, 1);

    88         resize(size() + QSize(newSizeHint.width(), -oldSizeHint.height()));

    89     }

    90 

    91     mainLayout->setSizeConstraint(QLayout::SetDefaultConstraint);

    92 }

    93 

    94 void Dialog::rotateWidgets()

    95 {

    96     Q_ASSERT(rotableWidgets.count() % 2 == 0);

    97 

    98     foreach (QWidget *widget, rotableWidgets)

    99         rotableLayout->removeWidget(widget);

   100 

   101     rotableWidgets.enqueue(rotableWidgets.dequeue());

   102 

   103     const int n = rotableWidgets.count();

   104     for (int i = 0; i < n / 2; ++i) {

   105         rotableLayout->addWidget(rotableWidgets[n - i - 1], 0, i);

   106         rotableLayout->addWidget(rotableWidgets[i], 1, i);

   107     }

   108 }

   109 

   110 void Dialog::help()

   111 {

   112     QMessageBox::information(this, tr("Dynamic Layouts Help"),

   113                                tr("This example shows how to change layouts "

   114                                   "dynamically."));

   115 }

   116 

   117 void Dialog::createRotableGroupBox()

   118 {

   119     rotableGroupBox = new QGroupBox(tr("Rotable Widgets"));

   120 

   121     rotableWidgets.enqueue(new QSpinBox);

   122     rotableWidgets.enqueue(new QSlider);

   123     rotableWidgets.enqueue(new QDial);

   124     rotableWidgets.enqueue(new QProgressBar);

   125 

   126     int n = rotableWidgets.count();

   127     for (int i = 0; i < n; ++i) {

   128         connect(rotableWidgets[i], SIGNAL(valueChanged(int)),

   129                 rotableWidgets[(i + 1) % n], SLOT(setValue(int)));

   130     }

   131 

   132     rotableLayout = new QGridLayout;

   133     rotableGroupBox->setLayout(rotableLayout);

   134 

   135     rotateWidgets();

   136 }

   137 

   138 void Dialog::createOptionsGroupBox()

   139 {

   140     optionsGroupBox = new QGroupBox(tr("Options"));

   141 

   142     buttonsOrientationLabel = new QLabel(tr("Orientation of buttons:"));

   143 

   144     buttonsOrientationComboBox = new QComboBox;

   145     buttonsOrientationComboBox->addItem(tr("Horizontal"), Qt::Horizontal);

   146     buttonsOrientationComboBox->addItem(tr("Vertical"), Qt::Vertical);

   147 

   148     connect(buttonsOrientationComboBox, SIGNAL(currentIndexChanged(int)),

   149             this, SLOT(buttonsOrientationChanged(int)));

   150 

   151     optionsLayout = new QGridLayout;

   152     optionsLayout->addWidget(buttonsOrientationLabel, 0, 0);

   153     optionsLayout->addWidget(buttonsOrientationComboBox, 0, 1);

   154     optionsLayout->setColumnStretch(2, 1);

   155     optionsGroupBox->setLayout(optionsLayout);

   156 }

   157 

   158 void Dialog::createButtonBox()

   159 {

   160     buttonBox = new QDialogButtonBox;

   161 

   162     closeButton = buttonBox->addButton(QDialogButtonBox::Close);

   163     helpButton = buttonBox->addButton(QDialogButtonBox::Help);

   164     rotateWidgetsButton = buttonBox->addButton(tr("Rotate &Widgets"),

   165                                                QDialogButtonBox::ActionRole);

   166 

   167     connect(rotateWidgetsButton, SIGNAL(clicked()), this, SLOT(rotateWidgets()));

   168     connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));

   169     connect(helpButton, SIGNAL(clicked()), this, SLOT(help()));

   170 }