dialog.cpp Example File

layouts/dynamiclayouts/dialog.cpp
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#include <QtWidgets> #include "dialog.h" Dialog::Dialog(QWidget *parent) : QDialog(parent) { createRotableGroupBox(); createOptionsGroupBox(); createButtonBox(); mainLayout = new QGridLayout; mainLayout->addWidget(rotableGroupBox, 0, 0); mainLayout->addWidget(optionsGroupBox, 1, 0); mainLayout->addWidget(buttonBox, 2, 0); setLayout(mainLayout); mainLayout->setSizeConstraint(QLayout::SetMinimumSize); setWindowTitle(tr("Dynamic Layouts")); } void Dialog::buttonsOrientationChanged(int index) { mainLayout->setSizeConstraint(QLayout::SetNoConstraint); setMinimumSize(0, 0); Qt::Orientation orientation = Qt::Orientation( buttonsOrientationComboBox->itemData(index).toInt()); if (orientation == buttonBox->orientation()) return; mainLayout->removeWidget(buttonBox); int spacing = mainLayout->spacing(); QSize oldSizeHint = buttonBox->sizeHint() + QSize(spacing, spacing); buttonBox->setOrientation(orientation); QSize newSizeHint = buttonBox->sizeHint() + QSize(spacing, spacing); if (orientation == Qt::Horizontal) { mainLayout->addWidget(buttonBox, 2, 0); resize(size() + QSize(-oldSizeHint.width(), newSizeHint.height())); } else { mainLayout->addWidget(buttonBox, 0, 3, 2, 1); resize(size() + QSize(newSizeHint.width(), -oldSizeHint.height())); } mainLayout->setSizeConstraint(QLayout::SetDefaultConstraint); } void Dialog::rotateWidgets() { Q_ASSERT(rotableWidgets.count() % 2 == 0); foreach (QWidget *widget, rotableWidgets) rotableLayout->removeWidget(widget); rotableWidgets.enqueue(rotableWidgets.dequeue()); const int n = rotableWidgets.count(); for (int i = 0; i < n / 2; ++i) { rotableLayout->addWidget(rotableWidgets[n - i - 1], 0, i); rotableLayout->addWidget(rotableWidgets[i], 1, i); } } void Dialog::help() { QMessageBox::information(this, tr("Dynamic Layouts Help"), tr("This example shows how to change layouts " "dynamically.")); } void Dialog::createRotableGroupBox() { rotableGroupBox = new QGroupBox(tr("Rotable Widgets")); rotableWidgets.enqueue(new QSpinBox); rotableWidgets.enqueue(new QSlider); rotableWidgets.enqueue(new QDial); rotableWidgets.enqueue(new QProgressBar); int n = rotableWidgets.count(); for (int i = 0; i < n; ++i) { connect(rotableWidgets[i], SIGNAL(valueChanged(int)), rotableWidgets[(i + 1) % n], SLOT(setValue(int))); } rotableLayout = new QGridLayout; rotableGroupBox->setLayout(rotableLayout); rotateWidgets(); } void Dialog::createOptionsGroupBox() { optionsGroupBox = new QGroupBox(tr("Options")); buttonsOrientationLabel = new QLabel(tr("Orientation of buttons:")); buttonsOrientationComboBox = new QComboBox; buttonsOrientationComboBox->addItem(tr("Horizontal"), Qt::Horizontal); buttonsOrientationComboBox->addItem(tr("Vertical"), Qt::Vertical); connect(buttonsOrientationComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(buttonsOrientationChanged(int))); optionsLayout = new QGridLayout; optionsLayout->addWidget(buttonsOrientationLabel, 0, 0); optionsLayout->addWidget(buttonsOrientationComboBox, 0, 1); optionsLayout->setColumnStretch(2, 1); optionsGroupBox->setLayout(optionsLayout); } void Dialog::createButtonBox() { buttonBox = new QDialogButtonBox; closeButton = buttonBox->addButton(QDialogButtonBox::Close); helpButton = buttonBox->addButton(QDialogButtonBox::Help); rotateWidgetsButton = buttonBox->addButton(tr("Rotate &Widgets"), QDialogButtonBox::ActionRole); connect(rotateWidgetsButton, SIGNAL(clicked()), this, SLOT(rotateWidgets())); connect(closeButton, SIGNAL(clicked()), this, SLOT(close())); connect(helpButton, SIGNAL(clicked()), this, SLOT(help())); }