eraseCDKSwindow3

Usage

Overview

The Cdk scrolling window (swindow) widget can be used to display messages. The following functions create or manipulate the Cdk swindow box widget.

Available functions

activateCDKSwindow

function activates the swindow widget and lets the user interact with the widget.

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

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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 or TAB 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.

addCDKSwindow

adds information to a scrolling window.

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The information is supplied by the info parameter. The information is immediately added to the scrolling window.

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The position of the new information is governed by the value of the parameter insertPosition. This parameter may be two values: TOP or BOTTOM.

cleanCDKSwindow

clears the information from the window.

destroyCDKSwindow

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

drawCDKSwindow

draws the swindow widget on the screen.

If the box parameter is true, the widget is drawn with a box.

dumpCDKSwindow

saves the contents of the scrolling window into the file specified by the filename parameter. It returns -1 on failure, and the number of lines saved if the dump was successful.

eraseCDKSwindow

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

execCDKSwindow

allows the user to execute a shell command and have the output of the shell command direct itself to the scrolling window.

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The command parameter is the command to execute.

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The insertPosition parameter tells where the output will be inserted within the scrolling window.

getCDKSwindowBox

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

getCDKSwindowContents

returns the contents of the scrolling window.

The parameter lines will be set to the number of lines returned.

injectCDKSwindow

injects a single character into the widget.

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

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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.

jumpToLineCDKSwindow

moves the scrolling window to the given line.

The parameter line may be an integer or one of the two predefined values TOP and BOTTOM.

loadCDKSwindowInformation

allows the user to load the contents of a file into the scrolling window. This function is interactive, and will ask for a filename.

moveCDKSwindow

moves the given widget to the given position.

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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.

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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).

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

newCDKSwindow

creates a swindow 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.

height and

width

control the height and width of the widget. If you provide a value of zero for either of the height or the width, the widget will be created with the full width and height of the screen. If you provide a negative value, the widget will be created the full height or width minus the value provided.

title

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

saveLines

is the number of lines to save before throwing information away.

box

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

The shadow

turns the shadow on or off around this widget.

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

positionCDKSwindow

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

saveCDKSwindowInformation

allows the user to save the contents of the scrolling window into a file. This function is interactive, and will ask for a filename.

setCDKSwindow

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

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The parameter info is a char ** of the information to set in the scrolling window; lines is the number of lines being added.

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The other parameter names correspond to the same parameter names listed in the newCDKSwindow function.

setCDKSwindowBackgroundAttrib

sets the background attribute of the widget.

The parameter attribute is a curses attribute, e.g., A_BOLD.

setCDKSwindowBackgroundColor

sets the background color of the widget.

The parameter color is in the format of the Cdk format strings.

See cdk_display (3).

setCDKSwindowBox

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

setCDKSwindowBoxAttribute

sets the attribute of the box.

setCDKSwindowContents

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

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The parameter info is a char ** of the information to set in the scrolling window.

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lines is the number of lines being added.

setCDKSwindowHorizontalChar

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

setCDKSwindowLLChar

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

setCDKSwindowLRChar

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

setCDKSwindowPostProcess

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

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The parameter function is the callback function.

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

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

setCDKSwindowPreProcess

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

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The parameter function is the callback function.

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

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

setCDKSwindowULChar

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

setCDKSwindowURChar

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

setCDKSwindowVerticalChar

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

trimCDKSwindow

removes information from a scrolling window.

The parameters start and end state where to start cutting from and where to stop.

The first element in the scrolling window starts at index 0.

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.