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The Q3GridView class provides an abstract base for fixed-size grids. More...
#include <Q3GridView>
This class is part of the Qt 3 support library. It is provided to keep old source code working. We strongly advise against using it in new code. See Porting to Qt 4 for more information.
Inherits Q3ScrollView.
| Q3GridView ( QWidget * parent = 0, const char * name = 0, Qt::WindowFlags f = 0 ) | |
| ~Q3GridView () | |
| QRect | cellGeometry ( int row, int column ) |
| int | cellHeight () const |
| QRect | cellRect () const |
| int | cellWidth () const |
| int | columnAt ( int x ) const |
| void | ensureCellVisible ( int row, int column ) |
| QSize | gridSize () const |
| int | numCols () const |
| int | numRows () const |
| void | repaintCell ( int row, int column, bool erase = true ) |
| int | rowAt ( int y ) const |
| virtual void | setCellHeight ( int ) |
| virtual void | setCellWidth ( int ) |
| virtual void | setNumCols ( int ) |
| virtual void | setNumRows ( int ) |
| void | updateCell ( int row, int column ) |
| virtual void | dimensionChange ( int oldNumRows, int oldNumCols ) |
| virtual void | paintCell ( QPainter * p, int row, int col ) = 0 |
| virtual void | paintEmptyArea ( QPainter * p, int cx, int cy, int cw, int ch ) |
| virtual void | drawContents ( QPainter * p, int cx, int cy, int cw, int ch ) |
The Q3GridView class provides an abstract base for fixed-size grids.
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).
Q3GridView is a very simple abstract class based on Q3ScrollView. 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 Q3Table instead. If you need a simple list of items, use a Q3ListBox. If you need to present hierachical data use a Q3ListView, and if you need random objects at random positions, consider using either a Q3IconView or a Q3Canvas.
This property holds the height of a grid row.
All rows in a grid view have the same height.
Access functions:
| int | cellHeight () const |
| virtual void | setCellHeight ( int ) |
See also cellWidth.
This property holds the width of a grid column.
All columns in a grid view have the same width.
Access functions:
| int | cellWidth () const |
| virtual void | setCellWidth ( int ) |
See also cellHeight.
This property holds the number of columns in the grid.
Access functions:
| int | numCols () const |
| virtual void | setNumCols ( int ) |
See also numRows.
This property holds the number of rows in the grid.
Access functions:
| int | numRows () const |
| virtual void | setNumRows ( int ) |
See also numCols.
Constructs a grid view.
The parent, name and widget flag, f, arguments are passed to the Q3ScrollView constructor.
Destroys the grid view.
Returns the geometry of cell (row, column) in the content coordinate system.
See also cellRect().
Returns the geometry of a cell in a cell's coordinate system. This is a convenience function useful in paintCell(). It is equivalent to QRect(0, 0, cellWidth(), cellHeight()).
See also cellGeometry().
Returns the number of the column at position x. x must be given in content coordinates.
See also rowAt().
This change handler is called whenever any of the grid's dimensions change. oldNumRows and oldNumCols contain the old dimensions, numRows() and numCols() contain the new dimensions.
Reimplemented from Q3ScrollView::drawContents().
Ensures cell (row, column) is visible, scrolling the grid view if necessary.
Returns the size of the grid in pixels.
This pure virtual function is called to paint the single cell at (row, col) using painter p. The painter must be open when paintCell() is called and must remain open.
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);
This function fills the cw pixels wide and ch pixels high rectangle starting at position (cx, cy) with the background color using the painter p.
paintEmptyArea() is invoked by drawContents() to erase or fill unused areas.
Repaints cell (row, column).
If erase is true, Qt erases the area of the cell before the paintCell() call; otherwise no erasing takes place.
See also QWidget::repaint().
Returns the number of the row at position y. y must be given in content coordinates.
See also columnAt().
Updates cell (row, column).
See also QWidget::update().
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