// // OvalButton class // part of the set of documents known as Java no sugar. // Copyright (c) 1996 Sunil Gupta, sunil@magnetic.demon.co.uk // placed into the public domain by the author // import java.awt.*; public class OvalButton extends Canvas { //################################################################## // //################################################################## private static final int BUTTON_UP = 1; private static final int BUTTON_DOWN = 2; private static final double ROOT2 = 1.414213562373; private static final double FUDGEFACTOR = 1.66666; public int CLICK_INTERVAL = 100; //milliseconds String caption; int button_state = BUTTON_UP; long button_down_time; //################################################################## // //################################################################## public OvalButton( String a_string) { caption = a_string; } //****************************************************************** // initial size must be set in addNotify, not in constructor or // tharr be null pointers public void addNotify() { super.addNotify(); resize(this.preferredSize()); } //****************************************************************** public void paint (Graphics g) { Dimension size; int x, y, text_width, text_height, oval_width, oval_height; FontMetrics metrics; Color colour; //-------------------------------------------------------------- size = size(); metrics = getFontMetrics(getFont()); text_width = metrics.stringWidth(caption); text_height = metrics.getHeight(); //------draw button shape --- bugs in oval as you can see.------ g.setColor( getBackground() ); g.fillRect(0,0,size.width, size.height); oval_width = size.width - 3; oval_height = size.height - 3; if (button_state == BUTTON_UP) { g.setColor( Color.white ); g.fillOval(0,0, oval_width,oval_height); g.setColor( Color.gray ); g.fillOval(2,2,oval_width,oval_height); } else { g.setColor( Color.gray ); g.fillOval(0,0, oval_width,oval_height); g.setColor( Color.white ); g.fillOval(2,2,oval_width,oval_height); } g.setColor( Color.lightGray ); g.fillOval(1,1, oval_width,oval_height); //-------------draw button text--------------------------------- x = (size.width - text_width) /2; y = (size.height + text_height) /2; if (button_state == BUTTON_UP) { g.setColor( Color.gray ); g.drawString(caption, x-1, y-1); g.setColor( Color.white ); g.drawString(caption, x+1, y+1); } else { g.setColor( Color.gray ); g.drawString(caption, x-1, y-1); g.drawString(caption, x+1, y+1); } if ( isEnabled() ) g.setColor( getForeground() ); else g.setColor( Color.gray ); g.drawString(caption, x, y); } //****************************************************************** public Dimension minimumSize() { return (this.preferredSize()); } //****************************************************************** public Dimension preferredSize() { int text_width, text_height; int oval_width, oval_height; FontMetrics metrics; Font font; Dimension preferred_dim; font = getFont(); metrics = getFontMetrics( font); text_width = metrics.stringWidth(caption); text_height = metrics.getHeight(); oval_width = (int) Math.round( text_width * ROOT2 * FUDGEFACTOR); oval_height = (int) Math.round( text_height * ROOT2); preferred_dim = new Dimension( oval_width , oval_height); return preferred_dim; } //****************************************************************** public boolean handleEvent(Event e) { long time_diff; switch (e.id) { case Event.MOUSE_DOWN: button_down_time = System.currentTimeMillis(); button_state = BUTTON_DOWN; repaint(); return true; case Event.MOUSE_UP: time_diff = System.currentTimeMillis() - button_down_time; if (time_diff <= CLICK_INTERVAL) postEvent(new Event(this,Event.ACTION_EVENT,this)); button_state = BUTTON_UP; repaint(); return true; default: return super.handleEvent(e); } } }
file: /Techref/language/java/nosugar/custom/button/code/OvalButton.java, 4KB, , updated: 1997/2/3 23:21, local time: 2024/8/31 19:15,
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