2014/6/30
public class Label extends Actor
{
public static final int LEFT = 0;
public static final int CENTER = 1;
public static final int RIGHT = 2;
// colours and other user definable attributes with default values
private Color textColor = Color.BLACK;
private Color backgroundColor = null;
private Color borderColor = null;
private int alignment = CENTER;
// spacing, with defaiult values
private int inset = 8; // space between text and edge
private String text;
private int baseline; // the y-coordinate of the text baseline
private int textX; // the x-coordinate of the left edge of the text
private int width = -1;
private int height = -1;
/**
* Create a label with a default text.
*/
public Label()
{
this("Label");
}
/**
* Create a label with a given text.
*/
public Label(String text)
{
this.text = text;
createImage();
}
/**
* Set the text to be displayed.
*/
public void setText(String text)
{
this.text = text;
createImage();
}
/**
* Return this label's text.
*/
public String getText()
{
return text;
}
/**
* Set the font for the label text.
*/
public void setFont(Font font)
{
getImage().setFont(font);
createImage();
}
/**
* Return this label's font.
*/
public Font getFont()
{
return getImage().getFont();
}
/**
* Set the background color.
*/
public void setBackground(Color backgroundColor)
{
this.backgroundColor = backgroundColor;
createImage();
}
/**
* Set the foreground color.
*/
public void setForeground(Color foregroundColor)
{
this.textColor = foregroundColor;
createImage();
}
/**
* Set the border color.
*/
public void setBorder(Color borderColor)
{
this.borderColor = borderColor;
createImage();
}
/**
* Set the text alignment. The value should be one of the alignment constants defined in this
* class (LEFT, CENTER, RIGHT).
*/
public void setAlignment(int alignment)
{
this.alignment = alignment;
createImage();
}
/**
* Set the width of this label to a fixed width.
*/
public void setWidth(int width)
{
this.width = width;
createImage();
}
/**
* Set the height of this label to a fixed height.
*/
public void setHeight(int height)
{
this.height = height;
createImage();
}
/**
* Override setLocation to position the label's top left corner at the given location.
*/
public void setLocation(int x, int y)
{
super.setLocation (x + getImage().getWidth()/2, y + getImage().getHeight()/2);
}
// --------------------------- private methods ---------------------------------
/**
* Paint the label image, including the button text and decorations.
*/
private void repaint()
{
paintBackground();
paintBorder();
paintText();
}
/**
* Paint the label's background.
*/
private void paintBackground()
{
if (backgroundColor != null) {
GreenfootImage img = getImage();
img.setColor(backgroundColor);
img.fill();
}
}
/**
* Paint the label's text.
*/
private void paintText()
{
GreenfootImage img = getImage();
img.setColor(textColor);
img.drawString(text, textX, baseline);
}
/**
* Paint the label's border.
*/
private void paintBorder()
{
if (borderColor != null) {
GreenfootImage img = getImage();
img.setColor(borderColor);
img.drawRect(0, 0, img.getWidth()-1, img.getHeight()-1);
}
}
/**
* Create the actor's image at the right size. If the size has been set explicitly, that size
* is used. If not, the size is calculated to fit the label text. The size calculation takes
* the text on the label and the current font into account.
*/
private void createImage()
{
int imgWidth = width;
int imgHeight = height;
GreenfootImage img = new GreenfootImage(10, 10);
Graphics gc = img.getAwtImage().getGraphics();
FontMetrics fm = gc.getFontMetrics();
int textWidth = fm.stringWidth(text);
if (imgWidth <= 0) {
imgWidth = textWidth + 2 * inset;
}
if (imgHeight <= 0) {
imgHeight = fm.getHeight() + 2 * inset;
}
baseline = (imgHeight/2) + (fm.getAscent()/2);
if (alignment == LEFT) {
textX = inset;
}
else if (alignment == RIGHT) {
textX = imgWidth - inset - textWidth;
}
else { // center
textX = (imgWidth/2) - (textWidth/2);
}
img.scale(imgWidth, imgHeight);
setImage(img);
repaint();
}
}public class TextBox extends Actor
{
public static final int LEFT = 0;
public static final int CENTER = 1;
public static final int RIGHT = 2;
private static final String INSERTION_CHAR = "\u2502";
// colours and other user definable attributes with default values
private Color textColor = Color.BLACK;
private Color backgroundColor = Color.WHITE;
private Color backgroundColorNormal = backgroundColor;
private Color backgroundColorFocused = Color.CYAN;
private Color borderColor = null;
private int alignment = CENTER;
// spacing, with defaiult values
private int inset = 8; // space between text and edge
private String text;
private int baseline; // the y-coordinate of the text baseline
private int textX; // the x-coordinate of the left edge of the text
private int width = -1;
private int height = -1;
private greenfoot.MouseInfo mouse;
private Actor mTarget;
private Actor mOver;
private int posFromEnd = 0;
private boolean hasFocus = false;
private Font myFont = new Font("Calibri", Font.BOLD, 12);
/**
* Create a label with a default text.
*/
public TextBox()
{
this("TextBox");
}
/**
* Create a Text Box with a given text.
*/
public TextBox(String text)
{
this.text = text;
createImage();
}
public void act() {
checkFocus(); // To check if we have focus
if (hasFocus) {
changeText();
}
}
/**
* Set the text to be displayed.
*/
public void setText(String text)
{
this.text = text;
createImage();
}
/**
* Return this label's text.
*/
public String getText()
{
return text;
}
/**
* Set the font for the label text.
*/
public void setFont(Font font)
{
getImage().setFont(font);
createImage();
}
/**
* Return this label's font.
*/
public Font getFont()
{
return getImage().getFont();
}
/**
* Set the background color.
*/
public void setBackground(Color bgColor)
{
this.backgroundColor = bgColor;
createImage();
}
/**
* Set the foreground color.
*/
public void setForeground(Color fgColor)
{
this.textColor = fgColor;
createImage();
}
/**
* Set the border color.
*/
public void setBorder(Color borderColor)
{
this.borderColor = borderColor;
createImage();
}
/**
* Set the text alignment. The value should be one of the alignment constants defined in this
* class (LEFT, CENTER, RIGHT).
*/
public void setAlignment(int alignment)
{
this.alignment = alignment;
createImage();
}
/**
* Set the width of this label to a fixed width.
*/
public void setWidth(int width)
{
this.width = width;
createImage();
}
/**
* Set the height of this label to a fixed height.
*/
public void setHeight(int height)
{
this.height = height;
createImage();
}
/**
* Override setLocation to position the label's top left corner at the given location.
*/
public void setLocation(int x, int y)
{
super.setLocation (x + getImage().getWidth()/2, y + getImage().getHeight()/2);
}
// --------------------------- private methods ---------------------------------
/**
*
* Work out if this TextBox has focus
*/
private void checkFocus() {
mouse = Greenfoot.getMouseInfo();
if (mouse != null) {
mOver = mouse.getActor();
if (mOver == null) {
if (hasFocus == true) {
lostFocus();
hasFocus = false;
}
}
else {
if (mouse.getClickCount() > 0) {
mTarget = mOver;
if (mTarget == this) {
if (hasFocus == false) {
gainedFocus();
}
hasFocus = true;
}
else {
if (hasFocus == true) {
lostFocus();
}
hasFocus = false;
}
}
}
}
}
/**
*
* Any actions required to draw user attention to the fact that we have focus
*/
private void gainedFocus() {
posFromEnd = 0;
insertChar(INSERTION_CHAR, posFromEnd);
backgroundColor = backgroundColorFocused;
setBackground(backgroundColor);
}
/**
*
* Reverse effect of gainedFocus()
*/
private void lostFocus() {
removeInsertionChar();
backgroundColor = backgroundColorNormal;
setBackground(backgroundColor);
}
/**
* Actually change the text in the box
*
*/
private void changeText() {
if (hasFocus == true) {
String S = Greenfoot.getKey();
if (S != null) {
if (S == "backspace") {
if (this.text.length() > 0) {
removeInsertionChar();
int len = this.text.length();
int pos = len + posFromEnd;
if (pos < 1) {
return; // We're at start so can't backspace
}
if (pos >= len) {
pos = len;
}
setText(this.text.substring(0,pos-1)+this.text.substring(pos));
}
insertChar(INSERTION_CHAR, posFromEnd);
return;
}
if (S == "left") {
posFromEnd--;
insertChar(INSERTION_CHAR, posFromEnd);
return;
}
if (S == "space") {
S = " ";
}
if (S == "escape") {
lostFocus();
return;
}
if (S == "right") {
posFromEnd++;
insertChar(INSERTION_CHAR, posFromEnd);
return;
}
if (posFromEnd == 0) {
setText(getText() + S);
return;
}
else {
insertChar(S + INSERTION_CHAR, posFromEnd);
}
}
}
}
/**
* Remove the char which shows a user where in the string text will be inserted
*
*/
private void removeInsertionChar() {
String tmpString = getText().replace(INSERTION_CHAR,"");
setText(tmpString);
}
/**
* Show a char to tell the user where new text will be inserted
*/
private void insertChar(String newChar, int posFromEnd) {
removeInsertionChar();
int len = getText().length();
int splitPos = len + posFromEnd;
if (splitPos < 0) {
splitPos = 0;
}
if (splitPos >= len) {
splitPos = len;
}
String S1 = getText().substring(0,splitPos);
String S2 = getText().substring(splitPos,len);
setText(S1 + newChar + S2);
}
/* METHODS FROM LABEL */
/**
* Paint the label image, including the button text and decorations.
*/
private void repaint()
{
paintBackground();
paintBorder();
paintText();
}
/**
* Paint the label's background.
*/
private void paintBackground()
{
if (backgroundColor != null) {
GreenfootImage img = getImage();
img.setColor(backgroundColor);
img.fill();
}
}
/**
* Paint the label's text.
*/
private void paintText()
{
GreenfootImage img = getImage();
img.setColor(textColor);
img.setFont(myFont);
img.drawString(text, textX, baseline);
}
/**
* Paint the label's border.
*/
private void paintBorder()
{
if (borderColor != null) {
GreenfootImage img = getImage();
img.setColor(borderColor);
img.drawRect(0, 0, img.getWidth()-1, img.getHeight()-1);
}
}
/**
* Create the actor's image at the right size. If the size has been set explicitly, that size
* is used. If not, the size is calculated to fit the label text. The size calculation takes
* the text on the label and the current font into account.
*/
private void createImage()
{
int imgWidth = width;
int imgHeight = height;
GreenfootImage img = new GreenfootImage(10, 10);
Graphics gc = img.getAwtImage().getGraphics();
FontMetrics fm = gc.getFontMetrics();
int textWidth = fm.stringWidth(text);
if (imgWidth <= 0) {
imgWidth = textWidth + 2 * inset;
}
if (imgHeight <= 0) {
imgHeight = fm.getHeight() + 2 * inset;
}
baseline = (imgHeight/2) + (fm.getAscent()/2);
if (alignment == LEFT) {
textX = inset;
}
else if (alignment == RIGHT) {
textX = imgWidth - inset - textWidth;
}
else { // center
textX = (imgWidth/2) - (textWidth/2);
}
img.scale(imgWidth, imgHeight);
setImage(img);
repaint();
}
}public class test_world extends World
{
int i = 0;
/**
* Constructor for objects of class test_world.
*
*/
public test_world()
{
// Create a new world with 600x400 cells with a cell size of 1x1 pixels.
super(600, 400, 1);
//TextBox tbOne = new TextBox("Hello World");
//addObject(tbOne, 100,100);
//TextBox tbTwo = new TextBox("Goodbye");
//addObject(tbTwo, 100,200);
//initialise label Pay Calculator
/*Label lOne = new Label("Pay Calculator");
addObject(lOne, 100,200);
//initialise Input A
TextBox tbThree = new TextBox("");
addObject(tbThree, 100,200);
//initialise label Hours
Label lTwo = new Label("Hours");
addObject(lTwo, 100,200);
prepare();
//initialise Input B
TextBox tbFour = new TextBox("");
addObject(tbFour, 100,200);
//initialise label Pay
Label lThree = new Label("Hours");
addObject(lThree, 100,200);*/
prepare();
}
/**
* Prepare the world for the start of the program. That is: create the initial
* objects and add them to the world.
*/
private void prepare()
{
/*TextBox textbox = new TextBox();
addObject(textbox, 290, 164);
textbox.setText("Jump");
TextBox textbox2 = new TextBox();
addObject(textbox2, 297, 95);
textbox2.setText("Lorem Ipsum");
removeObject(textbox2);
removeObject(textbox);*/
//create label Pay Calculator
Label label1 = new Label();
addObject(label1, 128,2);
label1.setText("Pay Calculator");
//create Input box A
TextBox textbox3 = new TextBox();
addObject(textbox3, 2,42);
textbox3.setText("");
//create label Hours
Label label2 = new Label();
addObject(label2, 52,42);
label2.setText("Hours");
//create Input box B
TextBox textbox4 = new TextBox();
addObject(textbox4, 160,42);
textbox4.setText("");
//create label Pay
Label label3 = new Label();
addObject(label3, 202,42);
label3.setText("Pay");
//create label Total Pay
Label label4 = new Label();
addObject(label4, 128,102);
label4.setText("Total Pay");
//create label ro Display Total Pay
Label label5 = new Label();
addObject(label5, 128,142);
label5.setText("");
}
}