pollymc/depends/groupview/src/categorizedview_p.h

/**
  * This file is part of the KDE project
  * Copyright (C) 2007, 2009 Rafael Fernández López <ereslibre@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

#ifndef KCATEGORIZEDVIEW_P_H
#define KCATEGORIZEDVIEW_P_H

class KCategorizedSortFilterProxyModel;
class KCategoryDrawer;
class KCategoryDrawerV2;
class KCategoryDrawerV3;

/**
  * @internal
  */
class KCategorizedView::Private
{
public:
	struct Block;
	struct Item;

	Private(KCategorizedView *q);
	~Private();

	/**
	  * @return whether this view has all required elements to be categorized.
	  */
	bool isCategorized() const;

	/**
	  * @return the block rect for the representative @p representative.
	  */
	QStyleOptionViewItemV4 blockRect(const QModelIndex &representative);

	/**
	  * Returns the first and last element that intersects with rect.
	  *
	  * @note see that here we cannot take out items between first and last (as we could
	  *       do with the rubberband).
	  *
	  * Complexity: O(log(n)) where n is model()->rowCount().
	  */
	QPair<QModelIndex, QModelIndex> intersectingIndexesWithRect(const QRect &rect) const;

	/**
	  * Returns the position of the block of @p category.
	  *
	  * Complexity: O(n) where n is the number of different categories when the block has been
	  *             marked as in quarantine. O(1) the rest of the times (the vast majority).
	  */
	QPoint blockPosition(const QString &category);

	/**
	  * Returns the height of the block determined by @p category.
	  */
	int blockHeight(const QString &category);

	/**
	  * Returns the actual viewport width.
	  */
	int viewportWidth() const;

	/**
	  * Marks all elements as in quarantine.
	  *
	  * Complexity: O(n) where n is model()->rowCount().
	  *
	  * @warning this is an expensive operation
	  */
	void regenerateAllElements();

	/**
	  * Update internal information, and keep sync with the real information that the model contains.
	  */
	void rowsInserted(const QModelIndex &parent, int start, int end);

	/**
	  * Returns @p rect in viewport terms, taking in count horizontal and vertical offsets.
	  */
	QRect mapToViewport(const QRect &rect) const;

	/**
	  * Returns @p rect in absolute terms, converted from viewport position.
	  */
	QRect mapFromViewport(const QRect &rect) const;

	/**
	  * Returns the height of the highest element in last row. This is only applicable if there is
	  * no grid set and uniformItemSizes is false.
	  *
	  * @param block in which block are we searching. Necessary to stop the search if we hit the
	  *              first item in this block.
	  */
	int highestElementInLastRow(const Block &block) const;

	/**
	  * Returns whether the view has a valid grid size.
	  */
	bool hasGrid() const;

	/**
	  * Returns the category for the given index.
	  */
	QString categoryForIndex(const QModelIndex &index) const;

	/**
	  * Updates the visual rect for item when flow is LeftToRight.
	  */
	void leftToRightVisualRect(const QModelIndex &index, Item &item,
							const Block &block, const QPoint &blockPos) const;

	/**
	  * Updates the visual rect for item when flow is TopToBottom.
	  * @note we only support viewMode == ListMode in this case.
	  */
	void topToBottomVisualRect(const QModelIndex &index, Item &item,
							const Block &block, const QPoint &blockPos) const;

	/**
	  * Called when expand or collapse has been clicked on the category drawer.
	  */
	void _k_slotCollapseOrExpandClicked(QModelIndex);

	KCategorizedView *q = nullptr;
	KCategorizedSortFilterProxyModel *proxyModel = nullptr;
	KCategoryDrawer *categoryDrawer = nullptr;
	int categorySpacing = 5;
	bool alternatingBlockColors = false;
	bool collapsibleBlocks = false;
	bool constantItemWidth = false;

	// FIXME: this is some really weird logic. Investigate.
	Block *hoveredBlock;
	QString hoveredCategory;
	QModelIndex hoveredIndex;

	QPoint pressedPosition;
	QRect rubberBandRect;

	QHash<QString, Block> blocks;
};

#endif // KCATEGORIZEDVIEW_P_H