eraseCDKMatrix3

Usage

Overview

The Cdk matrix widget creates a matrix widget. The following are functions which create or manipulate the Cdk matrix box widget.

Available functions

activateCDKMatrix

activates the matrix widget and lets the user interact with the widget.

•

The parameter matrix is a pointer to a non-NULL matrix widget.

•

If the actions parameter is passed with a non-NULL value, the characters in the array will be injected into the widget.

To activate the widget interactively pass in a NULL pointer for actions.

If the character entered into this widget is RETURN then this function will return 1. It will also set the widget data exitType to vNORMAL.

If the character entered into this widget was ESCAPE then the widget will return a value of -1 and the widget data exitType will be set to vESCAPE_HIT.

•

The matrix cell contents can be retrieved by using the info array of the matrix widget.

cleanCDKMatrix

clears the information from all cells of the matrix.

cleanCDKMatrixCell

clears the information from the specified cell of the matrix.

destroyCDKMatrix

removes the widget from the screen and frees memory the object used.

drawCDKMatrix

draws the matrix widget on the screen. If the box parameter is true, the widget is drawn with a box.

eraseCDKMatrix

removes the widget from the screen. This does NOT destroy the widget.

getCDKMatrixBox

returns true if the widget will be drawn with a box around it.

getCDKMatrixCell

returns the contents of the cell located by the row and col pair.

getCDKMatrixCol

returns the current column index.

getCDKMatrixRow

returns the current row index.

injectCDKMatrix

injects a single character into the widget.

•

The parameter matrix is a pointer to a non-NULL matrix widget.

•

The parameter character is the character to inject into the widget.

The return value and side-effect (setting the widget data exitType) depend upon the injected character:

RETURN or TAB

the function returns 1. The widget data exitType is set to vNORMAL.

ESCAPE

the function returns -1. The widget data exitType is set to vESCAPE_HIT.

Otherwise

unless modified by preprocessing, postprocessing or key bindings, the function returns -1. The widget data exitType is set to vEARLY_EXIT.

•

The matrix cell contents can be retrieved by using the info array of the matrix widget.

jumpToCell

provides an interactive method of moving to a cell. It pops up a scale widget and asks which cell the user wants to go to. Then it performs the jump.

moveCDKMatrix

moves the given widget to the given position.

•

The parameters xpos and ypos are the new position of the widget.

The parameter xpos may be an integer or one of the pre-defined values TOP, BOTTOM, and CENTER.

The parameter ypos may be an integer or one of the pre-defined values LEFT, RIGHT, and CENTER.

•

The parameter relative states whether the xpos/ypos pair is a relative move or an absolute move.

For example, if xpos = 1 and ypos = 2 and relative = TRUE, then the widget would move one row down and two columns right.

If the value of relative was FALSE, then the widget would move to the position (1,2).

Do not use the values TOP, BOTTOM, LEFT, RIGHT, or CENTER when relative = TRUE. (weird things may happen).

•

The final parameter refresh is a boolean value which states whether the widget will get refreshed after the move.

moveToCDKMatrixCell

jumps to the given cells dictated by the parameters row and col. It returns a value of TRUE or FALSE depending if the move was successful.

newCDKMatrix

creates a matrix widget and returns a pointer to it. Parameters:

screen

is the screen you wish this widget to be placed in.

xpos

controls the placement of the object along the horizontal axis. It may be an integer or one of the pre-defined values LEFT, RIGHT, and CENTER.

ypos

controls the placement of the object along the vertical axis. It may be an integer or one of the pre-defined values TOP, BOTTOM, and CENTER.

screenRows and

screenCols

are the number of rows and columns to be displayed on the screen respectively.

actualRows and

actualCols

are the number of actual rows and columns the matrix has.

title

is the string which will be displayed at the top of the widget. The title can be more than one line; just provide a carriage return character at the line break.

rowTitles and

colTitles

are the titles along the row and columns respectively.

columnWidths

is an array of integers stating how wide the individual columns are to be.

columnTypes

is an array of integers which correspond to the individual column display types. The values of the array should be assigned a value of type EDisplayType. See cdk_display(3) for legal values of EDisplayType.

rowSpace and

colSpace

dictate how much white space is to be between rows and columns respectively.

filler

is the character to use in empty space within a cell.

dominantAttribute

states which (the rows or the columns) will have the dominant character attributes. This is stated when a cell has both a row attribute and a column attribute.

If the value of the parameter dominantAttribute is set to ROW then the attribute of the row will be displayed. If it is set to COL then the column's attributes will be displayed instead.

boxMatrix

is true if the widget should be drawn with a box around it.

boxCell

is true if the individual cells should have boxes drawn around them.

shadow

turns the shadow on or off around this widget.

If the widget could not be created then a NULL pointer is returned.

positionCDKMatrix

allows the user to move the widget around the screen via the cursor/keypad keys. See cdk_position (3) for key bindings.

setCDKMatrix

lets the programmer modify certain elements of an existing matrix widget.

•

The parameter info is an array of char * which contains the cell information.

•

The parameter rows has the number of rows

•

the parameter info contains,

•

columnLengths has the lengths of the individual columns in info.

Do not use this function. It is obsolete, provided only for compatibility with older versions of CDK. Use setCDKMatrixCells.

setCDKMatrixBackgroundAttrib

sets the background attribute of the widget. The parameter attribute is a curses attribute, e.g., A_BOLD.

setCDKMatrixBackgroundColor

sets the background color of the widget. The parameter color is in the format of the Cdk format strings. See cdk_display (3).

setCDKMatrixBox

sets whether the widget will be drawn with a box around it.

setCDKMatrixBoxAttribute

sets the attribute of the box.

setCDKMatrixCB

allows the programmer to set a different widget input handler. The parameter callbackFunction is of type MATRIXCB. The default function is CDKMatrixCallBack.

setCDKMatrixCell

sets the contents of the cell located by the row and col pair. The value of the cell will be set to value.

setCDKMatrixCells

lets the programmer initialize elements of an existing matrix widget.

•

The parameter info is an array of char * which contains the cell information.

•

The parameter rows has the number of rows

•

The parameter cols has the number of columns

•

The parameter info contains, while columnLengths has the lengths of the individual columns in info.

setCDKMatrixHorizontalChar

sets the horizontal drawing character for the box to the given character.

setCDKMatrixLLChar

sets the lower left hand corner of the widget's box to the given character.

setCDKMatrixLRChar

sets the lower right hand corner of the widget's box to the given character.

setCDKMatrixPostProcess

allows the user to have the widget call a function after the key has been applied to the widget.

•

The parameter function is the callback function.

•

The parameter data points to data passed to the callback function.

To learn more about post-processing see cdk_process(3).

setCDKMatrixPreProcess

allows the user to have the widget call a function after a key is hit and before the key is applied to the widget.

•

The parameter function is the callback function.

•

The parameter data points to data passed to the callback function.

To learn more about pre-processing see cdk_process(3).

setCDKMatrixULChar

sets the upper left hand corner of the widget's box to the given character.

setCDKMatrixURChar

sets the upper right hand corner of the widget's box to the given character.

setCDKMatrixVerticalChar

sets the vertical drawing character for the box to the given character.

Key bindings

When the widget is activated there are several default key bindings which will help the user enter or manipulate the information quickly. The following table outlines the keys and their actions for this widget.