QGridView

NAME

SYNOPSIS

Inherits QScrollView.

Public Members

Properties

Protected Members

DESCRIPTION

A grid view consists of a number of abstract cells organized in rows and columns. The cells have a fixed size and are identified with a row index and a column index. The top-left cell is in row 0, column 0. The bottom-right cell is in row numRows()-1, column numCols()-1.

You can define numRows, numCols, cellWidth and cellHeight. Reimplement the pure virtual function paintCell() to draw the contents of a cell.

With ensureCellVisible(), you can ensure a certain cell is visible. With rowAt() and columnAt() you can find a cell based on the given x- and y-coordinates.

If you need to monitor changes to the grid's dimensions (i.e. when numRows or numCols is changed), reimplement the dimensionChange() change handler.

Note: the row and column indices are always given in the order, row (vertical offset) then column (horizontal offset). This order is the opposite of all pixel operations, which are given in the order x (horizontal offset), y (vertical offset).

QGridView is a very simple abstract class based on QScrollView. It is designed to simplify the task of drawing many cells of the same size in a potentially scrollable canvas. If you need rows and columns with different sizes, use a QTable instead. If you need a simple list of items, use a QListBox. If you need to present hierachical data use a QListView, and if you need random objects at random positions, consider using either a QIconView or a QCanvas.

See also Abstract Widget Classes.  

MEMBER FUNCTION DOCUMENTATION

QGridView::QGridView ( QWidget * parent = 0, const char * name = 0, WFlags f = 0 )

The parent, name and widget flag, f, arguments are passed to the QScrollView constructor.  

QGridView::~QGridView ()

QRect QGridView::cellGeometry ( int row, int column )

See also cellRect().  

int QGridView::cellHeight () const

QRect QGridView::cellRect () const

See also cellGeometry().  

int QGridView::cellWidth () const

int QGridView::columnAt ( int x ) const

See also rowAt().  

void QGridView::dimensionChange ( int oldNumRows, int oldNumCols ) [virtual protected]

void QGridView::ensureCellVisible ( int row, int column )

QSize QGridView::gridSize () const

int QGridView::numCols () const

int QGridView::numRows () const

void QGridView::paintCell ( QPainter * p, int row, int col ) [pure virtual protected]

The coordinate system is translated so that the origin is at the top-left corner of the cell to be painted, i.e. cell coordinates. Do not scale or shear the coordinate system (or if you do, restore the transformation matrix before you return).

The painter is not clipped by default in order to get maximum efficiency. If you want clipping, use

    p->setClipRect( cellRect(), QPainter::CoordPainter );


    //... your drawing code


    p->setClipping( FALSE );

void QGridView::paintEmptyArea ( QPainter * p, int cx, int cy, int cw, int ch ) [virtual protected]

paintEmptyArea() is invoked by drawContents() to erase or fill unused areas.  

void QGridView::repaintCell ( int row, int column, bool erase = TRUE )

If erase is TRUE, Qt erases the area of the cell before the paintCell() call; otherwise no erasing takes place.

See also QWidget::repaint().  

int QGridView::rowAt ( int y ) const

See also columnAt().  

void QGridView::setCellHeight ( int ) [virtual]

void QGridView::setCellWidth ( int ) [virtual]

void QGridView::setNumCols ( int ) [virtual]

void QGridView::setNumRows ( int ) [virtual]

void QGridView::updateCell ( int row, int column )

See also QWidget::update().  

Property Documentation

int cellHeight

All rows in a grid view have the same height.

See also cellWidth.

Set this property's value with setCellHeight() and get this property's value with cellHeight().  

int cellWidth

All columns in a grid view have the same width.

See also cellHeight.

Set this property's value with setCellWidth() and get this property's value with cellWidth().  

int numCols

Set this property's value with setNumCols() and get this property's value with numCols().

See also numRows.  

int numRows

Set this property's value with setNumRows() and get this property's value with numRows().

See also numCols.

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