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module dialog;


import qt.gui.QDialog;
import qt.gui.QGroupBox;
import qt.gui.QGridLayout;
import qt.gui.QLabel;
import qt.gui.QComboBox;
import qt.gui.QDialogButtonBox;
import qt.gui.QPushButton;
import qt.gui.QMessageBox;
import qt.gui.QSpinBox;
import qt.gui.QDial;
import qt.gui.QProgressBar;


class Dialog : public QDialog
{
public:

	this(QWidget parent = null)
	{
		super(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"));
	}

private:

	void buttonsOrientationChanged(int index)
	{
		mainLayout.setSizeConstraint(QLayout.SetNoConstraint);
		setMinimumSize(0, 0);

		Qt.Orientation orientation = cast(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_Orientation.Horizontal) {
			mainLayout.addWidget(buttonBox, 2, 0);
			resize(size() + QSize(-1 * oldSizeHint.width(), newSizeHint.height()));
		} else {
			mainLayout.addWidget(buttonBox, 0, 3, 2, 1);
			resize(size() + QSize(newSizeHint.width(), -1 * oldSizeHint.height()));
		}

		mainLayout.setSizeConstraint(QLayout.SetDefaultConstraint);
	}

	void rotateWidgets()
	{
		assert(rotableWidgets.length % 2 == 0);

		foreach (QWidget widget; rotableWidgets)
			rotableLayout.removeWidget(widget);

		rotableWidgets = rotableWidgets[1..$] ~ rotableWidgets[0];
		
		int n = rotableWidgets.length;
		for (int i = 0; i < n / 2; ++i) {
			rotableLayout.addWidget(rotableWidgets[n - i - 1], 0, i);
			rotableLayout.addWidget(rotableWidgets[i], 1, i);
		}
	}

	void help()
	{
		QMessageBox.information(this, tr("Dynamic Layouts Help"),
			tr("This example shows how to change layouts dynamically."));
	}

private:
	
	void createRotableGroupBox()
	{
		rotableGroupBox = new QGroupBox(tr("Rotable Widgets"));

		auto a0 = new QSpinBox;
		auto a1 = new QSlider;
		auto a2 = new QDial;
		auto a3 = new QProgressBar;
		
		rotableWidgets ~= a0;
		rotableWidgets ~= a1;
		rotableWidgets ~= a2;
		rotableWidgets ~= a3;

		connect!("valueChanged")(a0, &a1.setValue);
		connect!("valueChanged")(a1, &a2.setValue);
		connect!("valueChanged")(a2, &a3.setValue);
		connect!("valueChanged")(a3, &a0.setValue);

		/*
		int n = rotableWidgets.length;
		for (int i = 0; i < n; ++i) {
			rotableWidgets[i].valueChanged.connect(&rotableWidgets[(i + 1) % n].setValue);
		}*/

		rotableLayout = new QGridLayout;
		rotableGroupBox.setLayout(rotableLayout);

		rotateWidgets();
	}

	void createOptionsGroupBox()
	{
		optionsGroupBox = new QGroupBox(tr("Options"));

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

		buttonsOrientationComboBox = new QComboBox;
		buttonsOrientationComboBox.addItem(tr("Horizontal"), new QVariant(cast(ulong) Qt.Horizontal));
		buttonsOrientationComboBox.addItem(tr("Vertical"), new QVariant(cast(ulong) Qt.Vertical));

		connect!("currentIndexChanged")(buttonsOrientationComboBox, &this.buttonsOrientationChanged);

		optionsLayout = new QGridLayout;
		optionsLayout.addWidget(buttonsOrientationLabel, 0, 0);
		optionsLayout.addWidget(buttonsOrientationComboBox, 0, 1);
		optionsLayout.setColumnStretch(2, 1);
		optionsGroupBox.setLayout(optionsLayout);
	}

	void createButtonBox()
	{
		buttonBox = new QDialogButtonBox;

		closeButton = buttonBox.addButton(QDialogButtonBox.Close);
		helpButton = buttonBox.addButton(QDialogButtonBox.Help);
		rotateWidgetsButton = buttonBox.addButton(tr("Rotate &Widgets"), QDialogButtonBox.ActionRole);

		connect!("clicked")(rotateWidgetsButton, &this.rotateWidgets);
		connect!("clicked")(closeButton, &this.close);
		connect!("clicked")(helpButton, &this.help);
	}

	QGroupBox rotableGroupBox;
	QWidget[] rotableWidgets;
    
	QGroupBox optionsGroupBox;
	QLabel buttonsOrientationLabel;
	QComboBox buttonsOrientationComboBox;

	QDialogButtonBox buttonBox;
	QPushButton closeButton;
	QPushButton helpButton;
	QPushButton rotateWidgetsButton;

	QGridLayout mainLayout;
	QGridLayout rotableLayout;
	QGridLayout optionsLayout;
}