// This file is part of VSTGUI. It is subject to the license terms 
// in the LICENSE file found in the top-level directory of this
// distribution and at http://github.com/steinbergmedia/vstgui/LICENSE

#include "cdatabrowser.h"
#include "vstkeycode.h"
#include "cframe.h"
#include "controls/ctextedit.h"
#include "controls/cscrollbar.h"
#include "ifocusdrawing.h"
#include "cgraphicspath.h"
#include "cdrawcontext.h"
#include "idatabrowserdelegate.h"
#include <cmath>
#include <algorithm>

namespace VSTGUI {

/// @cond ignore
//-----------------------------------------------------------------------------------------------
class CDataBrowserView : public CView, public IFocusDrawing, public IDropTarget
//-----------------------------------------------------------------------------------------------
{
public:
	CDataBrowserView (const CRect& size, IDataBrowserDelegate* db, CDataBrowser* browser);

	void draw (CDrawContext* context) override;
	void drawRect (CDrawContext* context, const CRect& updateRect) override;
	CMouseEventResult onMouseDown (CPoint &where, const CButtonState& buttons) override;
	CMouseEventResult onMouseMoved (CPoint &where, const CButtonState& buttons) override;
	CMouseEventResult onMouseUp (CPoint &where, const CButtonState& buttons) override;
	CMouseEventResult onMouseExited (CPoint &where, const CButtonState& buttons) override;

	SharedPointer<IDropTarget> getDropTarget () override { return this; }
	DragOperation onDragEnter (DragEventData data) override;
	DragOperation onDragMove (DragEventData data) override;
	void onDragLeave (DragEventData data) override;
	bool onDrop (DragEventData data) override;
	
	void onKeyboardEvent (KeyboardEvent& keyCode) override;

	CRect getRowBounds (int32_t row);
	void invalidateRow (int32_t row);

	bool getCell (const CPoint& where, CDataBrowser::Cell& cell);

	bool drawFocusOnTop () override;
	bool getFocusPath (CGraphicsPath& outPath) override;
protected:

	IDataBrowserDelegate* db;
	CDataBrowser* browser;
};

//-----------------------------------------------------------------------------------------------
class CDataBrowserHeader : public CView
//-----------------------------------------------------------------------------------------------
{
public:
	CDataBrowserHeader (const CRect& size, IDataBrowserDelegate* db, CDataBrowser* browser);

	void draw (CDrawContext* context) override;
	void drawRect (CDrawContext* context, const CRect& updateRect) override;
	CMouseEventResult onMouseDown (CPoint &where, const CButtonState& buttons) override;
	CMouseEventResult onMouseMoved (CPoint &where, const CButtonState& buttons) override;
	CMouseEventResult onMouseUp (CPoint &where, const CButtonState& buttons) override;
	CMouseEventResult onMouseExited (CPoint &where, const CButtonState& buttons) override;

protected:
	int32_t getColumnAtPoint (CPoint& where);

	IDataBrowserDelegate* db;
	CDataBrowser* browser;

	CPoint startMousePoint;
	int32_t mouseColumn {0};
	CCoord startWidth {0};
};
/// @endcond

//-----------------------------------------------------------------------------------------------
/**
 * @param size size of data browser
 * @param db data browser interface. If db is inheritated from CBaseObject it will be remembered and released if data browser is destroyed
 * @param style data browser and scroll view style see #CDataBrowserStyle and #CScrollViewStyle
 * @param scrollbarWidth width of scrollbars
 * @param pBackground background bitmap
 */
CDataBrowser::CDataBrowser (const CRect& size, IDataBrowserDelegate* db, int32_t style, CCoord scrollbarWidth, CBitmap* pBackground)
: CScrollView (size, CRect (0, 0, 0, 0), style, scrollbarWidth, pBackground)
, db (db)
, dbView (nullptr)
, dbHeader (nullptr)
, dbHeaderContainer (nullptr)
{
	setTransparency (true);
	dbView = new CDataBrowserView (CRect (0, 0, 0, 0), db, this);
	dbView->setAutosizeFlags (kAutosizeLeft|kAutosizeRight|kAutosizeBottom);
	addView (dbView);
	auto obj = dynamic_cast<IReference*>(db);
	if (obj)
		obj->remember ();
}

//-----------------------------------------------------------------------------------------------
CDataBrowser::~CDataBrowser () noexcept
{
	auto obj = dynamic_cast<IReference*>(db);
	if (obj)
		obj->forget ();
}

//-----------------------------------------------------------------------------------------------
void CDataBrowser::setAutosizeFlags (int32_t flags)
{
	CScrollView::setAutosizeFlags (flags);
}

//-----------------------------------------------------------------------------------------------
void CDataBrowser::setViewSize (const CRect& size, bool invalid)
{
	if (getViewSize () != size)
	{
		CScrollView::setViewSize (size, invalid);
		recalculateLayout (true);
	}
}

//-----------------------------------------------------------------------------------------------
void CDataBrowser::setWantsFocus (bool state)
{
	if (dbView)
	{
		dbView->setWantsFocus (state);
	}
}

//------------------------------------------------------------------------
bool CDataBrowser::wantsFocus () const
{
	return dbView ? dbView->wantsFocus () : false;
}

//-----------------------------------------------------------------------------------------------
bool CDataBrowser::attached (CView *parent)
{
	bool result = CScrollView::attached (parent);
	if (result)
	{
		recalculateLayout (true);
		db->dbAttached (this);
	}
	return result;
}

//-----------------------------------------------------------------------------------------------
bool CDataBrowser::removed (CView* parent)
{
	if (isAttached ())
		db->dbRemoved (this);
	return CScrollView::removed (parent);
}

//------------------------------------------------------------------------
void CDataBrowser::onKeyboardEvent (KeyboardEvent& event)
{
	if (dbView)
		dbView->onKeyboardEvent (event);
}

//-----------------------------------------------------------------------------
CMouseEventResult CDataBrowser::onMouseDown (CPoint& where, const CButtonState& buttons)
{
	CMouseEventResult result = CViewContainer::onMouseDown (where, buttons);
	if (auto frame = getFrame ())
	{
		CView* focusView = frame->getFocusView ();
		if (focusView != dbView && !isChild (focusView, true))
			frame->setFocusView (dbView);
	}
	return result;
}

//-----------------------------------------------------------------------------
void CDataBrowser::valueChanged (CControl *pControl)
{
	CPoint origOffset = getScrollOffset ();
	CScrollView::valueChanged (pControl);
	CPoint offset = getScrollOffset ();
	if (origOffset != offset)
	{
		switch (pControl->getTag ())
		{
			case kHSBTag:
			{
				if (dbHeader)
				{
					CRect viewSize = dbHeader->getViewSize ();
					CCoord width = viewSize.getWidth ();
					viewSize.left = offset.x;
					viewSize.setWidth (width);
					dbHeader->setViewSize (viewSize);
					dbHeader->setMouseableArea (viewSize);
					dbHeader->invalid ();
				}
				break;
			}
		}
		if (isAttached () && (getMouseDownView () == dbView || getMouseDownView () == nullptr))
		{
			CPoint where;
			getFrame ()->getCurrentMouseLocation (where);
			if (getFrame ()->getViewAt (where, GetViewOptions ().deep ()) == dbView)
			{
				CDataBrowser::Cell cell;
				dbView->frameToLocal (where);
				dbView->getCell (where, cell);
				db->dbOnMouseMoved (where, getFrame ()->getCurrentMouseButtons (), cell.row, cell.column, this);
			}
		}
	}
}

//-----------------------------------------------------------------------------------------------
/**
 * @param rememberSelection if true selection will be remembered
 */
void CDataBrowser::recalculateLayout (bool rememberSelection)
{
	CCoord lineWidth = 0;
	CColor lineColor;
	db->dbGetLineWidthAndColor (lineWidth, lineColor, this);
	CCoord rowHeight = db->dbGetRowHeight (this);
	CCoord headerHeight = db->dbGetHeaderHeight (this);
	int32_t numRows = db->dbGetNumRows (this);
	int32_t numColumns = db->dbGetNumColumns (this);
	CCoord allRowsHeight = rowHeight * numRows;
	if (getStyle () & kDrawRowLines)
		allRowsHeight += numRows * lineWidth;
	CCoord allColumnsWidth = 0;
	for (int32_t i = 0; i < numColumns; i++)
		allColumnsWidth += db->dbGetCurrentColumnWidth (i, this);
	if (getStyle () & kDrawColumnLines)
		allColumnsWidth += numColumns * lineWidth;
	CRect newContainerSize (0, 0, allColumnsWidth, allRowsHeight);
	if (getStyle () & kDrawHeader)
	{
		CRect headerSize (0, 0, newContainerSize.getWidth (), headerHeight + lineWidth);
		if (dbHeader == nullptr)
		{
			dbHeaderContainer = new CViewContainer (headerSize);
			dbHeaderContainer->setAutosizeFlags (kAutosizeLeft|kAutosizeRight|kAutosizeTop);
			dbHeaderContainer->setTransparency (true);
			dbHeader = new CDataBrowserHeader (headerSize, db, this);
			dbHeaderContainer->addView (dbHeader);
			setEdgeView (Edge::Top, dbHeaderContainer);
		}
		else
		{
			headerSize.offset (getScrollOffset ().x, 0);
			dbHeader->setViewSize (headerSize);
			dbHeader->setMouseableArea (headerSize);
		}
	}
	setContainerSize (newContainerSize, true);
	if (dbView->getParentView ())
	{
		CRect ps = dbView->getParentView ()->getViewSize ();
		if (newContainerSize.getWidth () < ps.getWidth ())
			newContainerSize.setWidth (ps.getWidth ());
		if (newContainerSize.getHeight () < ps.getHeight ())
			newContainerSize.setHeight (ps.getHeight ());
		if (newContainerSize != getContainerSize ())
			setContainerSize (newContainerSize, true);
	}
	newContainerSize.offset (getScrollOffset ().x, -getScrollOffset ().y);
	dbView->setViewSize (newContainerSize);
	dbView->setMouseableArea (newContainerSize);

	CControl* scrollbar = getVerticalScrollbar ();
	if (scrollbar && newContainerSize.getHeight () > 0.)
	{
		float wheelInc = (float)(rowHeight / newContainerSize.getHeight ());
		scrollbar->setWheelInc (wheelInc);
	}

	if (getStyle () & kDrawHeader)
	{
		for (const auto& pV : getChildren ())
		{
			CRect viewSize = pV->getViewSize ();
			if (pV != dbHeaderContainer && viewSize.top < headerHeight+lineWidth)
			{
				if (getStyle () & kOverlayScrollbars && pV.cast<CScrollView> ())
					continue;

				bool autoSizingEnabled = false;
				if (auto container = pV->asViewContainer ())
				{
					autoSizingEnabled = container->getAutosizingEnabled ();
					container->setAutosizingEnabled (false);
				}
				viewSize.top += headerHeight+lineWidth;
				pV->setViewSize (viewSize);
				pV->setMouseableArea (viewSize);
				if (auto container = pV->asViewContainer ())
					container->setAutosizingEnabled (autoSizingEnabled);
			}
		}
	}
	
	if (isAttached ())
		invalid ();
		
	validateSelection ();
 
	if (!rememberSelection)
		unselectAll ();
}

//-----------------------------------------------------------------------------------------------
/**
 * @param cell cell to invalidate
 */
void CDataBrowser::invalidate (const Cell& cell)
{
	invalidRect (getCellBounds (cell));
}

//-----------------------------------------------------------------------------------------------
/**
 * @param row row to invalidate
 */
void CDataBrowser::invalidateRow (int32_t row)
{
	dbView->invalidateRow (row);
}

//-----------------------------------------------------------------------------------------------
/**
 * @param row row to make visible
 */
void CDataBrowser::makeRowVisible (int32_t row)
{
	CRect r = dbView->getRowBounds (row);
	makeRectVisible (r);
}

//-----------------------------------------------------------------------------------------------
/**
 * @param index row to select
 * @param makeVisible if true makes row visible
 */
void CDataBrowser::setSelectedRow (int32_t index, bool makeVisible)
{
	if (index == kNoSelection)
	{
		unselectAll ();
		return;
	}
	int32_t numRows = db->dbGetNumRows (this);
	if (index >= numRows)
		index = numRows-1;

	bool hasChanged = true;
	Selection::iterator alreadySelected = std::find (selection.begin (), selection.end (), index);
	if (alreadySelected != selection.end ())
	{
		selection.erase (alreadySelected);
		hasChanged = !selection.empty ();
	}
	else
	{
		invalidateRow (index);
	}
	
	for (auto row : selection)
	{
		dbView->invalidateRow (row);
	}
	selection.clear ();
	
	selection.emplace_back (index);
	if (hasChanged)
		db->dbSelectionChanged (this);
	
	if (makeVisible)
		makeRowVisible (index);
}

//-----------------------------------------------------------------------------------------------
int32_t CDataBrowser::getSelectedRow () const
{
	if (!selection.empty ())
		return selection[0];
	return kNoSelection;
}

//-----------------------------------------------------------------------------------------------
void CDataBrowser::selectRow (int32_t row)
{
	if (row > db->dbGetNumRows (this))
		return;
	Selection::iterator alreadySelected = std::find (selection.begin (), selection.end (), row);
	if (alreadySelected == selection.end ())
	{
		if (getStyle () & kMultiSelectionStyle)
		{
			selection.emplace_back (row);
			dbView->invalidateRow (row);
			db->dbSelectionChanged (this);
		}
		else
		{
			setSelectedRow (row);
		}
	}
}

//-----------------------------------------------------------------------------------------------
void CDataBrowser::unselectRow (int32_t row)
{
	if (row > db->dbGetNumRows (this))
		return;
	Selection::iterator alreadySelected = std::find (selection.begin (), selection.end (), row);
	if (alreadySelected != selection.end ())
	{
		if (getStyle () & kMultiSelectionStyle)
		{
			selection.erase (alreadySelected);
			dbView->invalidateRow (row);
			db->dbSelectionChanged (this);
		}
		else
		{
			unselectAll ();
		}
	}
}

//-----------------------------------------------------------------------------------------------
void CDataBrowser::unselectAll ()
{
	if (!selection.empty ())
	{
		for (auto row : selection)
		{
			dbView->invalidateRow (row);
		}
		selection.clear ();
		db->dbSelectionChanged (this);
	}
}

//-----------------------------------------------------------------------------------------------
void CDataBrowser::validateSelection ()
{
	bool selectionChanged = false;
	int32_t numRows = db->dbGetNumRows (this);
	for (Selection::iterator it = selection.begin (); it != selection.end ();)
	{
		if (*it >= numRows)
		{
			it = selection.erase (it);
			selectionChanged = true;
		}
		else
		{
			++it;
		}
	}
	if (selectionChanged)
		db->dbSelectionChanged (this);
}

//-----------------------------------------------------------------------------------------------
/**
 * @param cell cell
 * @return bounds of cell
 */
CRect CDataBrowser::getCellBounds (const Cell& cell)
{
	CCoord lineWidth = 0;
	if (getStyle () & kDrawRowLines || getStyle () & kDrawColumnLines)
	{
		CColor lineColor;
		db->dbGetLineWidthAndColor (lineWidth, lineColor, this);
	}
	CCoord rowHeight = db->dbGetRowHeight (this);
	if (getStyle () & kDrawRowLines)
		rowHeight += lineWidth;
	CRect result (0, rowHeight * cell.row, 0, rowHeight * (cell.row+1));
	for (int32_t i = 0; i <= cell.column; i++)
	{
		CCoord colWidth = db->dbGetCurrentColumnWidth (i, this);
		if (i != cell.column)
		{
			result.offset (colWidth, 0);
			if (getStyle () & kDrawColumnLines)
				result.offset (lineWidth, 0);
		}
		result.setWidth (colWidth);
	}
	CRect viewSize = dbView->getViewSize ();
	result.offset (viewSize.left, viewSize.top);
	return result;
}

//-----------------------------------------------------------------------------------------------
CDataBrowser::Cell CDataBrowser::getCellAt (const CPoint& where) const
{
	Cell pos;
	if (dbView)
	{
		CPoint w (where);
		localToFrame (w);
		dbView->frameToLocal (w);
		if (dbView->hitTest (w))
			dbView->getCell (w, pos);
	}
	return pos;
}

//-----------------------------------------------------------------------------------------------
/**
 * @param cell cell
 * @param initialText UTF-8 string the text edit field will be initialized with
 */
void CDataBrowser::beginTextEdit (const Cell& cell, UTF8StringPtr initialText)
{
	CRect r = getCellBounds (cell);
	makeRectVisible (r);
	CRect cellRect = getCellBounds (cell);
	auto* te = new CTextEdit (cellRect, nullptr, -1, initialText);
	db->dbCellSetupTextEdit (cell.row, cell.column, te, this);
	addView (te);
	getFrame ()->setFocusView (te);
	// save row and column
	te->setAttribute ('row ', cell.row);
	te->setAttribute ('col ', cell.column);
}

//-----------------------------------------------------------------------------------------------
CMessageResult CDataBrowser::notify (CBaseObject* sender, IdStringPtr message)
{
	if (message == kMsgLooseFocus)
	{
		if (auto* te = dynamic_cast<CTextEdit*>(sender))
		{
			// get row and column
			int32_t row = kNoSelection;
			int32_t col = kNoSelection;
			te->getAttribute ('row ', row);
			te->getAttribute ('col ', col);
			UTF8StringPtr newText = te->getText ();
			db->dbCellTextChanged (row, col, newText, this);
			removeView (te);
			getFrame ()->setFocusView (dbView);
			return kMessageNotified;
		}
	}
	return CViewContainer::notify (sender, message);
}

/// @cond ignore
//-----------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------------
CDataBrowserHeader::CDataBrowserHeader (const CRect& size, IDataBrowserDelegate* db, CDataBrowser* browser)
: CView (size)
, db (db)
, browser (browser)
{
	setTransparency (true);
}

//-----------------------------------------------------------------------------------------------
void CDataBrowserHeader::draw (CDrawContext* context)
{
	drawRect (context, getViewSize ());
}

//-----------------------------------------------------------------------------------------------
void CDataBrowserHeader::drawRect (CDrawContext* context, const CRect& updateRect)
{
	CColor lineColor;
	CCoord lineWidth = 0;
	if (browser->getStyle () & CDataBrowser::kDrawRowLines || browser->getStyle () & CDataBrowser::kDrawColumnLines)
	{
		db->dbGetLineWidthAndColor (lineWidth, lineColor, browser);
	}
	CCoord headerHeight = db->dbGetHeaderHeight (browser);
	if (browser->getStyle () & CDataBrowser::kDrawRowLines)
		headerHeight += lineWidth;
	int32_t numColumns = db->dbGetNumColumns (browser);

	CRect r (getViewSize ().left, getViewSize ().top, 0, 0);
	r.setHeight (headerHeight);
	for (int32_t col = 0; col < numColumns; col++)
	{
		CCoord columnWidth = db->dbGetCurrentColumnWidth (col, browser);
		r.setWidth (columnWidth);
		if (browser->getStyle () & CDataBrowser::kDrawColumnLines)
			r.right += lineWidth;
		CRect testRect (r);
		testRect.bound (updateRect);
		if (!testRect.isEmpty ())
		{
			db->dbDrawHeader (context, r, col, 0, browser);
		}
		r.offset (r.getWidth (), 0);
	}
	setDirty (false);
}

//-----------------------------------------------------------------------------------------------
int32_t CDataBrowserHeader::getColumnAtPoint (CPoint& where)
{
	// calculate column at point
	CCoord lineWidth = 0;
	if (browser->getStyle () & CDataBrowser::kDrawRowLines || browser->getStyle () & CDataBrowser::kDrawColumnLines)
	{
		CColor lineColor;
		db->dbGetLineWidthAndColor (lineWidth, lineColor, browser);
	}
	int32_t col = -1;
	int32_t numColumns = db->dbGetNumColumns (browser);
	CRect r (getViewSize ().left, getViewSize ().top, 0, getViewSize ().bottom);
	for (int32_t c = 0; c < numColumns; c++)
	{
		CCoord columnWidth = db->dbGetCurrentColumnWidth (c, browser);
		if (browser->getStyle () & CDataBrowser::kDrawColumnLines)
			columnWidth += lineWidth;
		r.setWidth (columnWidth);
		if (r.pointInside (where))
		{
			if (r.right - where.x < 5)
				col = c;
			break;
		}
		r.offset (columnWidth, 0);
	}
	return col;
}

//-----------------------------------------------------------------------------------------------
CMouseEventResult CDataBrowserHeader::onMouseDown (CPoint &where, const CButtonState& buttons)
{
	mouseColumn = getColumnAtPoint (where);
	CCoord minWidth;
	CCoord maxWidth;
	if (mouseColumn >= 0 && db->dbGetColumnDescription (mouseColumn, minWidth, maxWidth, browser) && minWidth != maxWidth)
	{
		startWidth = db->dbGetCurrentColumnWidth (mouseColumn, browser);
		startMousePoint = where;
		getFrame ()->setCursor (kCursorHSize);
		return onMouseMoved (where, buttons);
	}
	return kMouseDownEventHandledButDontNeedMovedOrUpEvents;
}

//-----------------------------------------------------------------------------------------------
CMouseEventResult CDataBrowserHeader::onMouseMoved (CPoint &where, const CButtonState& buttons)
{
	if (buttons & kLButton)
	{
		CCoord xOffset = where.x - startMousePoint.x;
		if (xOffset != 0)
		{
			CCoord minWidth;
			CCoord maxWidth;
			if (db->dbGetColumnDescription (mouseColumn, minWidth, maxWidth, browser))
			{
				CCoord columnWidth = db->dbGetCurrentColumnWidth (mouseColumn, browser);
				CCoord newWidth = startWidth + xOffset;
				if (newWidth < minWidth)
					newWidth = minWidth;
				if (newWidth > maxWidth)
					newWidth = maxWidth;
				if (newWidth != columnWidth)
				{
					db->dbSetCurrentColumnWidth (mouseColumn, newWidth, browser);
					browser->recalculateLayout (true);
				}
			}
		}
		return kMouseEventHandled;
	}
	else
	{
		int32_t col = getColumnAtPoint (where);
		CCoord minWidth;
		CCoord maxWidth;
		if (col >= 0 && db->dbGetColumnDescription (col, minWidth, maxWidth, browser) && minWidth != maxWidth)
			getFrame ()->setCursor (kCursorHSize);
		else
			getFrame ()->setCursor (kCursorDefault);
	}
	return kMouseEventNotHandled;
}

//-----------------------------------------------------------------------------------------------
CMouseEventResult CDataBrowserHeader::onMouseExited (CPoint &where, const CButtonState& buttons)
{
	getFrame ()->setCursor (kCursorDefault);
	return kMouseEventHandled;
}

//-----------------------------------------------------------------------------------------------
CMouseEventResult CDataBrowserHeader::onMouseUp (CPoint &where, const CButtonState& buttons)
{
	getFrame ()->setCursor (kCursorDefault);
	return kMouseEventHandled;
}

//-----------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------------
CDataBrowserView::CDataBrowserView (const CRect& size, IDataBrowserDelegate* db, CDataBrowser* browser)
: CView (size)
, db (db)
, browser (browser)
{
	setTransparency (true);
	setWantsFocus (true);
}

//-----------------------------------------------------------------------------------------------
CRect CDataBrowserView::getRowBounds (int32_t row)
{
	CCoord lineWidth = 0;
	if (browser->getStyle () & CDataBrowser::kDrawRowLines || browser->getStyle () & CDataBrowser::kDrawColumnLines)
	{
		CColor lineColor;
		db->dbGetLineWidthAndColor (lineWidth, lineColor, browser);
	}
	CCoord rowHeight = db->dbGetRowHeight (browser);

	CRect where (getViewSize ());
	where.originize ();
	if (browser->getStyle () & CDataBrowser::kDrawRowLines)
		rowHeight+=lineWidth;

	CRect r (getViewSize ().left, getViewSize ().top + rowHeight * row, getViewSize ().right, getViewSize ().top + rowHeight * (row+1));
	return r;
}

//-----------------------------------------------------------------------------------------------
void CDataBrowserView::invalidateRow (int32_t row)
{
	if (row == CDataBrowser::kNoSelection)
		return;

	CRect ia = getRowBounds (row);
	invalidRect (ia);
}

//-----------------------------------------------------------------------------------------------
void CDataBrowserView::draw (CDrawContext* context)
{
	drawRect (context, getViewSize ());
}

//-----------------------------------------------------------------------------------------------
void CDataBrowserView::drawRect (CDrawContext* context, const CRect& updateRect)
{
	const bool drawRowLines = (browser->getStyle () & CDataBrowser::kDrawRowLines) ? true : false;
	CCoord lineWidth = 0;
	CColor lineColor;
	if (browser->getStyle () & CDataBrowser::kDrawRowLines || browser->getStyle () & CDataBrowser::kDrawColumnLines)
	{
		db->dbGetLineWidthAndColor (lineWidth, lineColor, browser);
	}

	CCoord rowHeight = db->dbGetRowHeight (browser);
	if (drawRowLines)
		rowHeight += lineWidth;
	int32_t numRows = db->dbGetNumRows (browser);
	int32_t numColumns = db->dbGetNumColumns (browser);

	const CDataBrowser::Selection& selection = browser->getSelection ();

	CDrawContext::LineList lines;

	CRect r (getViewSize ());
	r.setHeight (rowHeight - lineWidth);
	for (int32_t row = 0; row < numRows; row++)
	{
		CRect testRect (r);
		testRect.bound (updateRect);
		if (testRect.isEmpty () == false)
		{
			bool isSelected = std::find (selection.begin (), selection.end (), row) != selection.end ();
			for (int32_t col = 0; col < numColumns; col++)
			{
				CCoord columnWidth = db->dbGetCurrentColumnWidth (col, browser);
				r.setWidth (columnWidth);
				testRect = r;
				testRect.bound (updateRect);
				if (testRect.isEmpty () == false)
				{
					context->setClipRect (testRect);
					CRect cellSize (r);
					cellSize.bottom++;
					cellSize.right++;
					db->dbDrawCell (context, cellSize, row, col, isSelected ? IDataBrowserDelegate::kRowSelected : 0, browser);
				}
				r.offset (columnWidth, 0);
				if (browser->getStyle () & CDataBrowser::kDrawColumnLines)
					r.offset (lineWidth, 0);
			}
		}
		r.left = getViewSize ().left;
		r.setWidth (getWidth ());
		if (drawRowLines)
			lines.emplace_back (r.getBottomLeft (), r.getBottomRight ());
		r.offset (0, rowHeight);
	}
	if (browser->getStyle () & CDataBrowser::kDrawColumnLines)
	{
		
		CPoint p1;
		CPoint p2;
		if (browser->getStyle () & CDataBrowser::kDrawColumnLines)
		{
			p1 (getViewSize ().left - lineWidth, getViewSize ().top);
			p2 (getViewSize ().left - lineWidth, getViewSize ().bottom);
			for (int32_t col = 0; col < numColumns - 1; col++)
			{
				p1.x = p2.x = p1.x + db->dbGetCurrentColumnWidth (col, browser) + lineWidth;
				lines.emplace_back (p1, p2);
			}
		}
	}
	if (!lines.empty ())
	{
		context->setClipRect (updateRect);
		context->setDrawMode (kAntiAliasing);
		context->setLineWidth (lineWidth);
		context->setFrameColor (lineColor);
		context->setLineStyle (kLineSolid);
		context->drawLines (lines);
	}
	setDirty (false);
}

//-----------------------------------------------------------------------------------------------
bool CDataBrowserView::getCell (const CPoint& where, CDataBrowser::Cell& cell)
{
	CPoint _where (where);
	_where.offset (-getViewSize ().left, -getViewSize ().top);
	if (_where.x < 0)
		return false;
	
	CCoord lineWidth = 0;
	if (browser->getStyle () & CDataBrowser::kDrawRowLines || browser->getStyle () & CDataBrowser::kDrawColumnLines)
	{
		CColor lineColor;
		db->dbGetLineWidthAndColor (lineWidth, lineColor, browser);
	}
	CCoord rowHeight = db->dbGetRowHeight (browser);
	int32_t numColumns = db->dbGetNumColumns (browser);

	if (browser->getStyle () & CDataBrowser::kDrawRowLines)
		rowHeight += lineWidth;
	int32_t rowNum = (int32_t)(_where.y / rowHeight);
	int32_t colNum = 0;
	CCoord cw = 0;
	for (int32_t i = 0; i < numColumns; i++)
	{
		cw += db->dbGetCurrentColumnWidth (i, browser);
		if (browser->getStyle () & CDataBrowser::kDrawColumnLines)
			cw += lineWidth;
		if (_where.x < cw && rowNum < db->dbGetNumRows (browser) && colNum < db->dbGetNumColumns (browser))
		{
			colNum = i;
			cell.row = rowNum;
			cell.column = colNum;
			return true;
		}
	}
	return false;
}

//-----------------------------------------------------------------------------------------------
CMouseEventResult CDataBrowserView::onMouseDown (CPoint &where, const CButtonState& buttons)
{
	getFrame ()->setFocusView (this);
	CDataBrowser::Cell cell;
	if (getCell (where, cell))
	{
		const CDataBrowser::Selection& selection = browser->getSelection ();
		bool alreadySelected = std::find (selection.begin (), selection.end (), cell.row) != selection.end ();
		if (browser->getStyle () & CDataBrowser::kMultiSelectionStyle)
		{
			if (buttons.getModifierState () == kControl)
			{
				if (alreadySelected)
					browser->unselectRow (cell.row);
				else
					browser->selectRow (cell.row);
			}
			else if (buttons.getModifierState () == kShift)
			{
				int32_t lastSelectedRow = !selection.empty () ? selection.back () : -1;
				if (lastSelectedRow < cell.row)
				{
					for (int32_t i = lastSelectedRow; i <= cell.row; i++)
					{
						browser->selectRow (i);
					}
				}
				else if (lastSelectedRow > cell.row)
				{
					for (int32_t i = cell.row; i < lastSelectedRow; i++)
					{
						browser->selectRow (i);
					}
				}
			}
			else
			{
				browser->setSelectedRow (cell.row);
			}
		}
		else if (!alreadySelected)
		{
			invalidateRow (cell.row);
			invalidateRow (browser->getSelectedRow ());
			browser->setSelectedRow (cell.row);
		}
		return db->dbOnMouseDown (where, buttons, cell.row, cell.column, browser);
	}
	return kMouseEventHandled;
}

//-----------------------------------------------------------------------------------------------
CMouseEventResult CDataBrowserView::onMouseMoved (CPoint &where, const CButtonState& buttons)
{
	CDataBrowser::Cell cell;
	if (getCell (where, cell))
	{
		return db->dbOnMouseMoved (where, buttons, cell.row, cell.column, browser);
	}
	return kMouseEventHandled;
}

//-----------------------------------------------------------------------------------------------
CMouseEventResult CDataBrowserView::onMouseUp (CPoint &where, const CButtonState& buttons)
{
	CDataBrowser::Cell cell;
	if (getCell (where, cell))
	{
		return db->dbOnMouseUp (where, buttons, cell.row, cell.column, browser);
	}
	return kMouseEventNotHandled;
}

//-----------------------------------------------------------------------------------------------
CMouseEventResult CDataBrowserView::onMouseExited (CPoint &where, const CButtonState& buttons)
{
	return db->dbOnMouseMoved (where, buttons, -1, -1, browser);
}

//-----------------------------------------------------------------------------------------------
bool CDataBrowserView::onDrop (DragEventData data)
{
	CPoint cellPoint (data.pos);
	CDataBrowser::Cell cell;
	if (getCell (data.pos, cell))
	{
		CRect r = browser->getCellBounds (cell);
		cellPoint.x -= r.left;
		cellPoint.y -= r.top;
	}
	return db->dbOnDropInCell (cell.row, cell.column, cellPoint, data.drag, browser);
}

//-----------------------------------------------------------------------------------------------
static const CViewAttributeID kDataBrowserViewDragRow = 'vddr';
static const CViewAttributeID kDataBrowserViewDragColumn = 'vddc';

//-----------------------------------------------------------------------------------------------
DragOperation CDataBrowserView::onDragEnter (DragEventData data)
{
	db->dbOnDragEnterBrowser (data.drag, browser);
	CDataBrowser::Cell cell;
	getCell (data.pos, cell);
	CRect r = browser->getCellBounds (cell);
	CPoint cellPoint (data.pos);
	cellPoint.x -= r.left;
	cellPoint.y -= r.top;
	auto result = db->dbOnDragEnterCell (cell.row, cell.column, cellPoint, data.drag, browser);
	setAttribute (kDataBrowserViewDragRow, cell.row);
	setAttribute (kDataBrowserViewDragColumn, cell.column);
	return result;
}

//-----------------------------------------------------------------------------------------------
void CDataBrowserView::onDragLeave (DragEventData data)
{
	int32_t oldRowNum = -1;
	int32_t oldColNum = -1;
	getAttribute (kDataBrowserViewDragRow, oldRowNum);
	getAttribute (kDataBrowserViewDragColumn, oldColNum);
	db->dbOnDragExitCell (oldRowNum, oldColNum, data.drag, browser);
	removeAttribute (kDataBrowserViewDragRow);
	removeAttribute (kDataBrowserViewDragColumn);
	db->dbOnDragExitBrowser (data.drag, browser);
}

//-----------------------------------------------------------------------------------------------
DragOperation CDataBrowserView::onDragMove (DragEventData data)
{
	DragOperation result = DragOperation::None;
	int32_t oldRowNum = -1;
	int32_t oldColNum = -1;
	getAttribute (kDataBrowserViewDragRow, oldRowNum);
	getAttribute (kDataBrowserViewDragColumn, oldColNum);
	CDataBrowser::Cell cell;
	getCell (data.pos, cell);
	CRect r = browser->getCellBounds (cell);
	CPoint cellPoint (data.pos);
	cellPoint.x -= r.left;
	cellPoint.y -= r.top;
	if (oldRowNum != cell.row || oldColNum != cell.column)
	{
		if (oldRowNum != -1 && oldColNum != -1)
			db->dbOnDragExitCell (oldRowNum, oldColNum, data.drag, browser);
		result = db->dbOnDragEnterCell (cell.row, cell.column, cellPoint, data.drag, browser);
		setAttribute (kDataBrowserViewDragRow, cell.row);
		setAttribute (kDataBrowserViewDragColumn, cell.column);
	}
	else
	{
		result = db->dbOnDragMoveInCell (cell.row, cell.column, cellPoint, data.drag, browser);
	}
	return result;
}

//-----------------------------------------------------------------------------------------------
void CDataBrowserView::onKeyboardEvent (KeyboardEvent& event)
{
	db->dbOnKeyboardEvent (event, browser);
	if (event.consumed || event.type != EventType::KeyDown)
		return;
	if (!event.modifiers.empty ())
		return;
	if (event.virt == VirtualKey::Up || event.virt == VirtualKey::Down || event.virt == VirtualKey::PageUp || event.virt == VirtualKey::PageDown)
	{
		int32_t numRows = db->dbGetNumRows (browser);
		int32_t selRow = browser->getSelectedRow ();
		int32_t changeRow = 0;
		if (event.virt == VirtualKey::Up)
			changeRow = -1;
		else if (event.virt == VirtualKey::Down)
			changeRow = 1;
		else if (event.virt == VirtualKey::PageUp)
			changeRow = (int32_t) (-browser->getHeight () / db->dbGetRowHeight (browser));
		else if (event.virt == VirtualKey::PageDown)
			changeRow = (int32_t) (browser->getHeight () / db->dbGetRowHeight (browser));
		int32_t newSelRow = selRow + changeRow;
		newSelRow = std::min<int32_t> (newSelRow, numRows);
		newSelRow = std::max<int32_t> (newSelRow, 0);
		if (newSelRow != selRow)
		{
			invalidateRow (selRow);
			invalidateRow (newSelRow);
			browser->setSelectedRow (newSelRow, true);
			CRect rect = getRowBounds (newSelRow);
			browser->makeRectVisible (rect);
		}
		event.consumed = true;
	}
}

//-----------------------------------------------------------------------------------------------
bool CDataBrowserView::drawFocusOnTop ()
{
	return true;
}

//-----------------------------------------------------------------------------------------------
bool CDataBrowserView::getFocusPath (CGraphicsPath& outPath)
{
	CRect r = getVisibleViewSize ();
	outPath.addRect (r);
	CCoord focusWidth = getFrame ()->getFocusWidth ();
	r.inset (focusWidth, focusWidth);
	outPath.addRect (r);
	return true;
}

/// @endcond

//-----------------------------------------------------------------------------------------------
} // VSTGUI