Mega Code Archive
Dynamic layout
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#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include <QQueue>
QT_BEGIN_NAMESPACE
class QComboBox;
class QDialogButtonBox;
class QGridLayout;
class QGroupBox;
class QLabel;
class QPushButton;
QT_END_NAMESPACE
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = 0);
private slots:
void buttonsOrientationChanged(int index);
void rotateWidgets();
void help();
private:
void createRotableGroupBox();
void createOptionsGroupBox();
void createButtonBox();
QGroupBox *rotableGroupBox;
QQueue<QWidget *> rotableWidgets;
QGroupBox *optionsGroupBox;
QLabel *buttonsOrientationLabel;
QComboBox *buttonsOrientationComboBox;
QDialogButtonBox *buttonBox;
QPushButton *closeButton;
QPushButton *helpButton;
QPushButton *rotateWidgetsButton;
QGridLayout *mainLayout;
QGridLayout *rotableLayout;
QGridLayout *optionsLayout;
};
#endif
#include <QtGui>
#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()));
}
#include <QApplication>
#include "dialog.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Dialog dialog;
return dialog.exec();
}
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