/************************************************* * Author: Evelyn Lai-Tee Cheok * Department of Electrical Engineering * Center for Telecommunications Research * Schapiro Research Building * Columbia University * * Email: laitee@ctr.columbia.edu * **************************************************/ import java.lang.*; import java.awt.*; abstract class ChoiceBar extends Bar { /** * selected item index */ int curSelected = 0; /** * Constructs a Bar with button count and direction * @param count : button's count * @param direction : bars direction (VERTICAL, HORIZONTAL) */ public ChoiceBar(int count, int direction) { super(count, direction); } /** * implement's abstract method in Bar * @param i : button index in Bar * @see Bar */ public boolean isButtonUp(int i) { return i != curSelected; } /** * implement's abstract method in Bar * @param i : button index in Bar * @see Bar */ public void pressButton(int i) { if (curSelected != i) { Graphics g = getGraphics(); clearCell(g, curSelected); drawUpCell(g, curSelected); curSelected = i; clearCell(g, curSelected); drawDownCell(g, curSelected); g.dispose(); setSelectedItem(i); //call child's function } } } abstract class Bar extends Canvas { /** * button's drawing area size */ final int sizeCell = 30; /** * bar's drawing area size */ final int sizeBar = 40; /** * gab between bar border and button border */ int gabBarCell = (sizeBar - sizeCell) / 2; /** * help string array pointer */ private String[] help = null; // showState /** * current displaying help pointer */ private static String curHelp = null; /** * bar's dispaying stylw */ int direction; static final int HORIZONTAL = 1; static final int VERTICAL = 2; /** * button count in bar */ private int count; /** * getCellRect help variable */ private int factorX, factorY; /** * draw button method called when paint button * @param g : graphics * @param i : button index in Bar * @param rc : drawing area */ abstract void drawCell(Graphics g, int i, Rectangle rc); /** * called when mouse downd the button * @param g : graphics * @param i : button index in Bar * @param rc : drawing area */ abstract public void pressButton(int i); /** * return the button state * @param i : button index in Bar * @return : true if button is up state */ abstract public boolean isButtonUp(int i); /** * called when button down * set target's content variable * @param i : pressed button index in Bar */ abstract void setSelectedItem(int i); /** * Constructs a Bar with button count and direction * @param count : button's count * @param direction : bars direction (VERTICAL, HORIZONTAL) */ public Bar(int count, int direction) { this.count = count; setBackground(Color.lightGray); this.direction = direction; if (direction == HORIZONTAL) { factorX = 1; factorY = 0; resize(sizeCell*count + gabBarCell*2, sizeBar); } else { factorX = 0; factorY = 1; resize(sizeBar, sizeCell*count + gabBarCell*2); } } public Dimension getDimension() { Dimension dimension = new Dimension(); Dimension dim = size(); System.out.println(" Dimension of this component = "+dim.width+" "+dim.height); if ( direction == HORIZONTAL ) { dimension.width = count*sizeCell + 2*gabBarCell; dimension.height = sizeCell + 2*gabBarCell; } else { dimension.width = sizeCell + 2*gabBarCell; dimension.height = count*sizeCell + 2*gabBarCell; System.out.println("COUNT = "+count); System.out.println("SIZECELL = "+sizeCell); System.out.println("GABBARCELL = "+gabBarCell); } System.out.println(" Dimension calculated based on count = "+dimension.width+ " "+dimension.height); return dimension; } /** * set help string * @param help : help String */ /*public void setHelp(String[] help) { if (help.length >= count) this.help = help; } */ public void paint(Graphics g) { int i; Dimension dm = size(); // draw border g.setColor(Color.lightGray); g.draw3DRect(0, 0, dm.width - 1, dm.height - 1, true); // draw each cell for (i = 0; i < count; i++) { if (isButtonUp(i)) // child's method drawUpCell(g, i); else drawDownCell(g, i); } g.dispose(); } /** * draw up shape button * it call child;s function drawCell * @param g : graphics * @param i : button index in Bar */ void drawUpCell(Graphics g, int i) { Rectangle rc = getCellRect(i); g.setColor(Color.lightGray); g.draw3DRect(rc.x, rc.y, rc.width, rc.height, true); drawCell(g, i, getCellInterior(i, true)); } /** * draw dwon shape button * it call child;s function drawCell * @param g : graphics * @param i : button index in Bar */ void drawDownCell(Graphics g, int i) { Rectangle rc = getCellRect(i); g.setColor(Color.lightGray); g.draw3DRect(rc.x, rc.y, rc.width, rc.height, false); drawCell(g, i, getCellInterior(i, false)); } /** * clear button * @param g : graphics * @param i : button index in Bar */ public void clearCell(Graphics g, int i) { Rectangle rc = getCellRect(i); g.clearRect(rc.x, rc.y, rc.width, rc.height); } /** * get area of a button * @param i : button index in Bar * @return button's area */ public Rectangle getCellRect(int i) { int startPos = i*sizeCell; return new Rectangle(factorX*startPos + gabBarCell, factorY*startPos + gabBarCell, sizeCell - 1, sizeCell - 1); } /** * get drawing area of a button * @param i : button index in Bar * @param isUp : state of button * @return button's area */ public Rectangle getCellInterior(int i, boolean isUp) { int startPos = i*sizeCell; int factor = (isUp) ? 0 : 1; return new Rectangle(factorX*startPos + gabBarCell + 4 + factor, factorY*startPos + gabBarCell + 4 + factor, sizeCell - 8, sizeCell - 8); } /** * get left top point of button's area * @param i : button index in Bar * @return left top point of button's area */ public Point getCellPos(int i) { int startPos; startPos = i*sizeCell; return new Point(factorX*startPos, factorY*startPos); } /** * get button's index by position * @param x: x position * @param y: y position * @return button's index */ protected int getButtonIndex(int x, int y) { if (direction == HORIZONTAL && x < gabBarCell + sizeCell*count && y > gabBarCell && y < sizeBar - gabBarCell) { return (x - gabBarCell) / sizeCell; } else if (direction == VERTICAL && y < gabBarCell + sizeCell*count && x > gabBarCell && x < sizeBar - gabBarCell) { return (y - gabBarCell) / sizeCell; } return -1; } public boolean mouseDown(Event e, int x, int y) { int i = getButtonIndex(x, y); if (i != -1) pressButton(i); return true; } /* * Show help in status line */ public boolean mouseMove(Event e, int x, int y) { /*if (help == null) { if (curHelp != null) WorkPanel.applet.showStatus(""); return true; } int i = getButtonIndex(x, y); if (i != -1) { if (curHelp != help[i]) WorkPanel.applet.showStatus(help[i]); curHelp = help[i]; } else { if (curHelp != null) WorkPanel.applet.showStatus(""); curHelp = null; } */ return true; } }