Manual Reference Pages - CDK (3)
cdk - Curses Development Kit
Standard Widget Behavior
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Cdk provides functions to use a large number of predefined curses widgets.
To use the Cdk widgets the header file cdk.h must be included in the source.
The widgets available from Cdk are listed below.
|Widget Type||Manual Page Name|
|DoubleFloat Scale||cdk_dscale (3)|
|Entry Field||cdk_entry (3)|
|File Selector||cdk_fselect (3)|
|File Viewer||cdk_viewer (3)|
|Floating Scale||cdk_fscale (3)|
|Floating Slider||cdk_fslider (3)|
|Integer Scale||cdk_scale (3)|
|Integer Slider||cdk_slider (3)|
|Item List||cdk_itemlist (3)|
|Multiple Line Entry Field||cdk_mentry (3)|
|Pulldown Menu||cdk_menu (3)|
|Radio List||cdk_radio (3)|
|Scrolling List||cdk_scroll (3)|
|Scrolling Selection List||cdk_selection (3)|
|Scrolling Window||cdk_swindow (3)|
|Unsigned Scale||cdk_uscale (3)|
|Unsigned Slider||cdk_uslider (3)|
The rest of the manual pages describe supporting functions:
|Manual Page Name||Description|
|cdk_binding (3)||Outlines how to create user definable key bindings.
|cdk_display (3)||Shows how to add special display attributes,
colors, and justification into a widget.
|cdk_draw (3)||Outlines functions used for drawing text and lines.
|cdk_screen (3)||Demonstrates the use of screens within Cdk.
|cdk_misc (3)||Outlines miscellaneous functions provided with the Cdk library.
|cdk_process (3)||Demonstrates the use of the pre- and post-process function class.
Cdk is a library of functions which allow a programmer to quickly create a
full screen interactive program with ease.
The Cdk widgets support the
o Ncurses library.
Instead of using the standard curses library, Cdk can take advantage of the
colors that Ncurses provides.
To learn how to take advantage of Cdks color
capabilities, see cdk_display (3).
o Key Bindings.
Individual keys can be overridden with a callback.
The callback is set up using
the bindCDKObject function.
To learn more about this see cdk_binding (3).
o Pre and Post Processing.
Certain widgets allow the user to trap a character before and after the
character has been applied to the widget.
This allows programmers to filter character input.
To learn more about this see cdk_process (3).
o Self Test Widgets.
With the use of the inject function class and the activate function,
programmers can have the widgets test themselves.
This allows the programmer
to perform automated tests on a final program.
o Special Display Formats
There are special character format commands that can be inserted into any
string in Cdk and the contents will get mapped to a chtype (see the
curses manual page) with character attributes.
This allows the programmer to
insert format types on each character if they wish.
o The Ability To Build Predefined Screens
Widgets can be associated to any given screen.
If there is more than one
screen defined, then Cdk has the ability to "flip" from one screen to another
See the cdk_screen manual page for more details.
STANDARD WIDGET BEHAVIOR
All of the widgets have a member of the structure called exitType.
This member states how the widget exited.
There are three values in which to check
for, they are as follows:
|vNORMAL||This means the widget exited normally.
This value is set when the widget is given the characters TAB or RETURN.
|vEARLY_EXIT||This means the widget exited early.
This value is set when characters such as
TAB or RETURN are injected into the
widget via the injectCDKXXX function and the
character injected does not exit the widget.
|vERROR||This value states that an error was returned by curses, e.g., if the
terminal was disconnected.
|vESCAPE_HIT||This value states the user hit ESCAPE to leave the widget.
|vNEVER_ACTIVATED||This is the initial state of the value.
This means that the widget has not been activated.
The header file <cdk.h> automatically includes the header files
The <curses.h> header file includes <stdio.h> and <unctrl.h>.
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