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** This file is part of the examples of the Qt Toolkit.
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module borderlayout;


import qt.gui.QLayout;
import qt.gui.QWidgetItem;
import qt.gui.QTextBrowser;
import qt.core.QSize;
import qt.core.QRect;


class BorderLayout : public QLayout
{
public:

	enum Position { West, North, South, East, Center };

	this(QWidget parent, int margin = 0, int spacing = -1)
	{
		super(parent);
		setMargin(margin);
		setWidgetSpacing(spacing);
	}

	this(int spacing = -1)
	{
		setWidgetSpacing(spacing);
	}

	~this()
	{
		QLayoutItem l = takeAt(0);
		while (l) {
			delete l;
			l = takeAt(0);
		}
	}

	void addItem(IQLayoutItem item)
	{
		add(item, Position.West);
	}

	void addWidget(QWidget widget, Position position)
	{
		add(cast(IQLayoutItem) new QWidgetItem(widget), position);
	}

	int expandingDirections()
	{
		return Qt.Horizontal | Qt.Vertical;
	}

	bool hasHeightForWidth()
	{
		return false;
	}

	int count()
	{
		return list.length;
	}

	QLayoutItem itemAt(int index)
	{
		if(index >= 0 && index < list.length) 
			return list[index].item;
		else
			return null;
	}

	QSize minimumSize()
	{
		return calculateSize(SizeType.MinimumSize);
	}

	void setGeometry(QRect rect)
	{
		ItemWrapper center = null;
		int eastWidth = 0;
		int westWidth = 0;
		int northHeight = 0;
		int southHeight = 0;
		int centerHeight = 0;
		int i;

		super.setGeometry(rect);

		for (i = 0; i < list.length; ++i) {
			ItemWrapper wrapper = list[i];
			IQLayoutItem item = wrapper.item;
			Position position = wrapper.position;

			if (position == Position.North) {
				item.setGeometry(QRect(rect.x(), northHeight, rect.width(),
					    item.sizeHint().height()));

				northHeight += item.geometry().height() + widgetSpacing();
			} else if (position == Position.South) {
				item.setGeometry(QRect(item.geometry().x(),
					    item.geometry().y(), rect.width(),
					    item.sizeHint().height()));

				southHeight += item.geometry().height() + widgetSpacing();

				item.setGeometry(QRect(rect.x(),
				      rect.y() + rect.height() - southHeight + widgetSpacing(),
				      item.geometry().width(),
				      item.geometry().height()));
			} else if (position == Position.Center) {
				center = wrapper;
			}
		}

		centerHeight = rect.height() - northHeight - southHeight;

		for (i = 0; i < list.length; ++i) {
			ItemWrapper wrapper = list[i];
			IQLayoutItem item = wrapper.item;
			Position position = wrapper.position;

			if (position == Position.West) {
				item.setGeometry(QRect(rect.x() + westWidth, northHeight,
					    item.sizeHint().width(), centerHeight));

				westWidth += item.geometry().width() + widgetSpacing();
			} else if (position == Position.East) {
				item.setGeometry(QRect(item.geometry().x(), item.geometry().y(),
					    item.sizeHint().width(), centerHeight));

				eastWidth += item.geometry().width() + widgetSpacing();

				item.setGeometry(QRect(
				      rect.x() + rect.width() - eastWidth + widgetSpacing(),
				      northHeight, item.geometry().width(),
				      item.geometry().height()));
			}
		}

		if (center)
			center.item.setGeometry(QRect(westWidth, northHeight,
				rect.width() - eastWidth - westWidth,
				centerHeight));
	}

	QSize sizeHint()
	{
		return calculateSize(SizeType.SizeHint);
	}

	QLayoutItem takeAt(int index)
	{
		if (index >= 0 && index < list.length) {
			ItemWrapper layoutStruct = list[index];
			return layoutStruct.item;
		}
		return null;
	}

	void add(IQLayoutItem item, Position position)
	{
		list ~= new ItemWrapper(item, position);
	}

private:

	class ItemWrapper
	{
		this(IQLayoutItem i, Position p)
		{
			item = i;
			position = p;
		}

		IQLayoutItem item;
		Position position;
	};

	enum SizeType { MinimumSize, SizeHint };

	QSize calculateSize(SizeType sizeType)
	{
		QSize totalSize;

		for (int i = 0; i < list.length; ++i) {
			ItemWrapper wrapper = list[i];
			Position position = wrapper.position;
			QSize itemSize;

			if (sizeType == SizeType.MinimumSize)
				itemSize = wrapper.item.minimumSize();
			else // (sizeType == SizeHint)
				itemSize = wrapper.item.sizeHint();

			if (position == Position.North || position == Position.South || position == Position.Center)
				totalSize.setHeight(totalSize.height + itemSize.height);
			
			if (position == Position.West || position == Position.East || position == Position.Center)
				totalSize.setWidth(totalSize.width + itemSize.width);
		}
		return totalSize;
	}

	ItemWrapper[] list;
}