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</R>Purpose<!R>
The template widget allows the programmer to present a user with an entry field
which has a strict format requirement. This widget is best used to retrieve
date fields or phone numbers, both of which have a specific format.
</R>Construction Options<!R>
A template widget is defined using the following syntax. The variable
</B>$templateObject<!B> contains a reference to the template object.
$templateObject = new Cdk::Template ( options );
The options are defined in the following table.
</U>Option Default Value Type Purpose<!U>
Label Required Scalar This is the label of the widget.
Plate Required Scalar This is the format plate for the entry field. The accepted characters for the plate are listed below.
Overlay Required Scalar This is the default background of the template field. For a date field it could be DD/MM/YYYY
Lpos Center Scalar This is the position of the label in the widget.
Xpos Center Scalar This is the position of the window on the X axis.
Ypos Center Scalar This is the position of the window on the Y axis.
Box True Scalar This boolean states whether the dialog box will have a box drawn around it.
Shadow False Scalar This boolean states whether the dialog box will have a shadow on the box.
The </B>Plate<!B> option takes a specific format to state which type of character
will be accepted at each location. The following table lists the characters and what they mean.
</U>Character Meaning<!U>
# Accepts numeric values only. (0-9)
A Alphabetic characters only. (a-zA-Z)
C Alphabetic characters only. This will force the character to upper case.
c Alphabetic characters only. This will force the character to lower case.
X Mixed upper case characters.
x Mixed lower case characters.
Anything else. Used as plate information.
</R>Available Methods<!R>
</B>activate<!B>
Activation of an object means to make the object available for use. The
following example demonstrates how to activate a template widget.
$returnValue = $templateObject->activate ();
The variable </B>$returnValue<!B> is the string value of what was typed in
the field. It does </U>not<!U> have the overlay characters mixed in with it.
This means that if a date field were used and the plate looked like
<C>##/##/####
and the overlay looked like
<C>DD-MM-YYYY
and the date June 1 1968 were typed in, then the resultant value would be
<C>01061968
To mix the field value and the overlay, call the mix method. Calling the mix
method on the above example would result in
<C>01-06-1968
</B>inject<!B>
This function injects a single character into the widget. The following
examples demonstrates how to call the inject method.
<C></B>$templateObject->inject ( options );
The options are defined in the following table.
</U>Option Default Value Type Purpose<!U>
Shadow Required Scalar The character to inject into the widget.
If you are injecting a special character into the widget, then you can
use a pre-defined value to represent the key.
<C><#UL><#HL(12)><#TT><#HL(15)><#UR>
<C><#VL></U>Key <#VL>Key Value <!U><#VL>
<C><#VL>Left Arrow <#VL>KEY_LEFT <#VL>
<C><#VL>Right Arrow <#VL>KEY_RIGHT <#VL>
<C><#VL>Up Arrow <#VL>KEY_UP <#VL>
<C><#VL>Down Arrow <#VL>KEY_DOWN <#VL>
<C><#VL>Delete <#VL>KEY_DELETE <#VL>
<C><#VL>Backspace <#VL>KEY_BACKSPACE <#VL>
<C><#VL>Page Up <#VL>KEY_PPAGE <#VL>
<C><#VL>Page Down <#VL>KEY_NPAGE <#VL>
<C><#VL>Home <#VL>KEY_HOME <#VL>
<C><#VL>End <#VL>KEY_END <#VL>
<C><#VL>Escape <#VL>KEY_ESC <#VL>
<C><#LL><#HL(12)><#BT><#HL(15)><#LR>
</B>set<!B>
Sets or resets certain attributes or features of the widget. The following
example demonstrates how to call the set method.
$templateObject->set ( options );
The options are defined in the following table.
</U>Option Default Value Type Purpose<!U>
Value Required Scalar Sets the value of the field.
</B>bind<!B>
The bind method binds keys to events. The binding is specific to the individual
objects. The following example demonstrates how to call the bind method.
$templateObject->bind ( options );
The options are defined in the following table.
</U>Option Default Value Type Purpose<!U>
Key Required Scalar This is the character to bind the event to.
Function Required Scalar This is the name of the callback function.
</B>preProcess<!B>
The </B>preProcess<!B> function sets a process to be run before the key entered
is processed. If this function returns a value of 0, then the key injected
into the widget will not be processed; otherwise the character will be
processed as normal. The following example demonstrates how to call the
preProcess method.
<C></B>$templateObject->preProcess ( options );
The options are defined in the following table.
</U>Option Default Value Type Purpose<!U>
Function Required Scalar This is the name of the
callback function.
To create a pre-process callback the following code segment demonstrates
how to do it properly.
<C></B>$templateObject->preProcess ('Function' => sub { callback (@_); });
Notice that the array </B>@_<!B> is passed into the function called
</B>callback<!B>. This is done because when the callback process is
called the key which was pressed is passed into the perl subroutine.
Since we nest the call-back function inside an anonymous subroutine,
we need to pass the array </B>@_<!B> to the call-back function. If
the key given to the call-back function is a non alphanumeric key
then a predefined value will be given to the function. The following
table describes the values passed into the function.
<C><#UL><#HL(12)><#TT><#HL(15)><#UR>
<C><#VL></U>Key <#VL>Key Value <!U><#VL>
<C><#VL>Left Arrow <#VL>KEY_LEFT <#VL>
<C><#VL>Right Arrow <#VL>KEY_RIGHT <#VL>
<C><#VL>Up Arrow <#VL>KEY_UP <#VL>
<C><#VL>Down Arrow <#VL>KEY_DOWN <#VL>
<C><#VL>Delete <#VL>KEY_DELETE <#VL>
<C><#VL>Backspace <#VL>KEY_BACKSPACE <#VL>
<C><#VL>Page Up <#VL>KEY_PPAGE <#VL>
<C><#VL>Page Down <#VL>KEY_NPAGE <#VL>
<C><#VL>Home <#VL>KEY_HOME <#VL>
<C><#VL>End <#VL>KEY_END <#VL>
<C><#VL>Escape <#VL>KEY_ESC <#VL>
<C><#LL><#HL(12)><#BT><#HL(15)><#LR>
If the pre-process function returns a value of 0 the key hit will
not be injected into the widget. This allows the programmer to
selectively pick which characters will or will not get injected
into the widget.
The </B>postProcess<!B> function sets a process to be run before the key entered
is processed. If this function returns a value of 0, then the key injected
into the widget will not be processed; otherwise the character will be
processed as normal. The following example demonstrates how to call the
postProcess method.
<C></B>$templateObject->postProcess ( options );
The options are defined in the following table.
</U>Option Default Value Type Purpose<!U>
Function Required Scalar This is the name of the
callback function.
To create a post-process callback the following code segment demonstrates
how to do it properly.
<C></B>$templateObject->postProcess ('Function' => sub { callback (@_); });
Notice that the array </B>@_<!B> is passed into the function called
</B>callback<!B>. This is done because when the callback process is
called the key which was pressed is passed into the perl subroutine.
Since we nest the call-back function inside an anonymous subroutine,
we need to pass the array </B>@_<!B> to the call-back function. If
the key given to the call-back function is a non alphanumeric key
then a predefined value will be given to the function. The following
table describes the values passed into the function.
<C><#UL><#HL(12)><#TT><#HL(15)><#UR>
<C><#VL></U>Key <#VL>Key Value <!U><#VL>
<C><#VL>Left Arrow <#VL>KEY_LEFT <#VL>
<C><#VL>Right Arrow <#VL>KEY_RIGHT <#VL>
<C><#VL>Up Arrow <#VL>KEY_UP <#VL>
<C><#VL>Down Arrow <#VL>KEY_DOWN <#VL>
<C><#VL>Delete <#VL>KEY_DELETE <#VL>
<C><#VL>Backspace <#VL>KEY_BACKSPACE <#VL>
<C><#VL>Page Up <#VL>KEY_PPAGE <#VL>
<C><#VL>Page Down <#VL>KEY_NPAGE <#VL>
<C><#VL>Home <#VL>KEY_HOME <#VL>
<C><#VL>End <#VL>KEY_END <#VL>
<C><#VL>Escape <#VL>KEY_ESC <#VL>
<C><#LL><#HL(12)><#BT><#HL(15)><#LR>
</B>draw<!B>
This method draws the object on the screen. The following example demonstrates
how to call the draw method.
$templateObject->draw ( options );
The options are defined in the following table.
</U>Option Default Value Type Purpose<!U>
Box True Scalar Draws the window with a box around it.
</B>erase<!B>
This method removes the object from the screen. This does </B/U>NOT<!B!U>
destroy the object. The following example demonstrates how to call the erase
method.
$templateObject->erase ();
</B>mix<!B>
This method returns a mixed value of the template field value and the overlay.
The following example demonstrates how to call the mix method.
$mixedValue = $templateObject();
</B>raise<!B>
The raise method raises the widget to the top of the screen. This means if there
were any widgets obscuring part of the view, raising the object would bring the
complete object into view. The following example demonstrates how to call the
raise method.
$templateObject->raise();
</B>lower<!B>
The lower method lowers the object so it doesn't obscure the view of any other
objects. The following example demonstrates how to call the lower method.
$templateObject->lower();
</B>register<!B>
The register method registers the object to the default screen. This does </R>NOT<!R>
have to be called since the objects are registered automatically. This method
should be called if the </B>unregister<!B> method was called. The following
example demonstrates how to call the register method.
$templateObject->register();
</B>unregister<!B>
The unregister method should be called when a widget, which is part of the
default screen, needs to be taken away temporarily. This does not delete or free
the object, it just unmaps it from any future screen refreshes. The object can
be registered by calling the </B>register<!B> method. The following example
demonstrates how to call the unregister method.
$templateObject->unregister();
</B>getwin<!B>
This method returns a pointer to the window of the object. Not much use for this
yet. It will be useful in the future when the drawing methods are added. The
following example demonstrates how to call the getwin method.
$templateObject->getwin();
</R>Default Key Bindings<!R>
</U>Key Action<!U>
Delete Deletes the last character in the field.
Backspace Deletes the last character in the field.
Return Leaves the widget and returns the field value.
Tab Leaves the widget and returns the field value.
CTRL-N Leaves the widget and returns the field value.
CTRL-R Refreshes the screen.
</R>Tips & Tricks<!R>
None.
</R>Physical Restrictions<!R>
None.
</R>Example Use Of The Widget<!R>
#!/usr/local/bin/perl
#
# Load in the Cdk Extension.
#
use Cdk;
Cdk::init();
# Create the template object.
$template = new Cdk::Template (
'Label' => 'Type in a date:',
'Plate' => '## ## ####',
'Overlay' => 'DD-MM-YYYY');
# Activate the widget.
$date = $template->activate();
$mixedDate = $template->mix();
# Exit Cdk.
Cdk::end();
# Print out the info.
print "\n\n\n";
print "Without Overlay Mixing: $date\n";
print "With Overlay Mixing : $mixedDate\n";
<C><#HL(70)>
<C>Document Created: June, 1995
<C>Document Revised: November, 1995
<C>Document Revised: March, 2012
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