Class EDU.emporia.mathbeans.MathTextField

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Class EDU.emporia.mathbeans.MathTextField

Object
   |
   +----Component
           |
           +----Container
                   |
                   +----JComponent
                           |
                           +----JTextComponent
                                   |
                                   +----JTextField
                                           |
                                           +----EDU.emporia.mathbeans.MathTextField

public class MathTextField
extends JTextField

A text field that can be used to display numerical data for mathematical purposes. It can parse common arithmetic expressions

Version:: 1.0
Author:: Joe Yanik
Since:: 7/6/00

autoNumberOfCharacters: Determines whether maxNumberOfCharacters should be based on the size of the text field
errorMessage: The error message that should be displayed in the case of a parsing error
mathValue: The mathematical value represented in the text field
maxNumberOfCharacters: The maximum number of characters (not counting the decimal point) to be displayed

EDU.emporia.mathbeans.MathTextField()

adjustCharacterLength(int): Adjusts the number of characters to be displayed to accommodate the size
getMathValue(): Returns the mathematical value corresponding to the String displayed in the text field
getMaxNumberOfCharacters(): Gets the maximum number of characters (not counting the decimal point) that will be displayed in the text field.
isAutoNumberOfCharacters(): Returns the value of autoNumberOfCharacters which determines whether or not the number of characters should be determined by user preference or by the width of the text field
main(String[])
processFocusEvent(FocusEvent): Method to handle focus events.
setAutoNumberOfCharacters(boolean): Sets the value of autoNumberOfCharacters which determines whether or not the number of characters should be determined by user preference or by the width of the text field
setBounds(int, int, int, int): Overridden method to adjust the number of characters displayed when the text field is resized.
setBounds(Rectangle): Overridden method to adjust the number of characters displayed when the text field is resized.
setMathValue(double): Sets the mathematical value corresponding to be displayed in the text field
setMaxNumberOfCharacters(int): Sets the maximum number of characters (not counting the decimal point) that will be displayed in the text field.
setSize(int, int): Overridden method to adjust the number of characters displayed when the text field is resized.
setSize(Dimension): Overridden method to adjust the number of characters displayed when the text field is resized.
setText(String): Overrides the setText method of JTextField to parse an arithmetic expression.

autoNumberOfCharacters

protected boolean autoNumberOfCharacters

Determines whether maxNumberOfCharacters should be based on the size of the text field

errorMessage

protected boolean errorMessage

The error message that should be displayed in the case of a parsing error

mathValue

protected double mathValue

The mathematical value represented in the text field

maxNumberOfCharacters

protected int maxNumberOfCharacters

The maximum number of characters (not counting the decimal point) to be displayed

MathTextField

public MathTextField()

adjustCharacterLength

public void adjustCharacterLength(int w)

Adjusts the number of characters to be displayed to accommodate the size

Parameters:: w - The width in pixels

getMathValue

public double getMathValue()

Returns the mathematical value corresponding to the String displayed in the text field

Returns:: The value

getMaxNumberOfCharacters

public int getMaxNumberOfCharacters()

Gets the maximum number of characters (not counting the decimal point) that will be displayed in the text field. Numerical data will be formatted to fit into that space. Must be at least 6.

Returns:: The maximum number of characters (not counting the decimal point) that will be displayed.

isAutoNumberOfCharacters

public boolean isAutoNumberOfCharacters()

Returns the value of autoNumberOfCharacters which determines whether or not the number of characters should be determined by user preference or by the width of the text field

Returns:: True if the maximum number of characters will be based on the width of the text field. False if it will be based on the value of maxNumberOfCharacters.

main

public static void main(String[] argv)

processFocusEvent

public void processFocusEvent(FocusEvent e)

Method to handle focus events. It tries to parse the expression when the focus is lost and selects the text when the focus is gained

Parameters:: e - a focus event
Overrides:: processFocusEvent in class JComponent

setAutoNumberOfCharacters

public void setAutoNumberOfCharacters(boolean autoNumberOfCharacters)

Sets the value of autoNumberOfCharacters which determines whether or not the number of characters should be determined by user preference or by the width of the text field

Parameters:: autoNumberOfCharacters - If true the maximum number of characters will be based on the width of the text field. Otherwise it will be based on the value of maxNumberOfCharacters.

setBounds

public void setBounds(int a,
                      int b,
                      int c,
                      int d)

Overridden method to adjust the number of characters displayed when the text field is resized.

Parameters:: a - x-coordinate; b - y-coordinate; c - with; d - height
Overrides:: setBounds in class Component

setBounds

public void setBounds(Rectangle a)

Overridden method to adjust the number of characters displayed when the text field is resized.

Parameters:: a - The rectangle used in resizing
Overrides:: setBounds in class Component

setMathValue

public void setMathValue(double value)

Sets the mathematical value corresponding to be displayed in the text field

Parameters:: value - The value to be displayed

setMaxNumberOfCharacters

public void setMaxNumberOfCharacters(int maxNumberOfCharacters)

Sets the maximum number of characters (not counting the decimal point) that will be displayed in the text field. Numerical data will be formatted to fit into that space. Must be at least 6.

Parameters:: maxNumberOfCharacters - The maximum number of characters (not counting the decimal point) that will be displayed. Any value smaller than 6 will be ignored.

setSize

public void setSize(int a,
                    int b)

Overridden method to adjust the number of characters displayed when the text field is resized.

Parameters:: a - width; b - height
Overrides:: setSize in class Component

setSize

public void setSize(Dimension a)

Overridden method to adjust the number of characters displayed when the text field is resized.

Parameters:: a - Dimension used inresizing
Overrides:: setSize in class Component

setText

public void setText(String s)

Overrides the setText method of JTextField to parse an arithmetic expression.

Parameters:: s - The text to be parsed
Overrides:: setText in class JTextComponent

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