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test program to log events generated by an applet
Archived examples from previous versions of courses example from a Well House Consultants training course
More on Archived examples from previous versions of courses [link]
Source code: curlew.java Module: J610
--- ARCHIVED EXAMPLE (may not be current) ---
--- See notes at http://www.wellho.net/mouth/2654.html --- import java.applet.*; import java.awt.*; import java.util.*; public class curlew extends Applet { // Handle mouse events public boolean mouseDown(Event e, int x, int y) { showLine(mods(e.modifiers) + "Mouse Down: " + x + "," + y ); return true; } public boolean mouseUp(Event e, int x, int y) { showLine(mods(e.modifiers) + "Mouse Up: " + x + "," + y ); return true; } public boolean mouseDrag(Event e, int x, int y) { showLine(mods(e.modifiers) + "Mouse Drag: " + x + "," + y ); return true; } public boolean mouseMove(Event e, int x, int y) { showLine(mods(e.modifiers) + "Mouse Move: " + x + "," + y ); return true; } public boolean mouseEnter(Event e, int x, int y) { showLine("Mouse Enter: " + x + "," + y ); return true; } public boolean mouseExit(Event e, int x, int y) { showLine("Mouse Exit: " + x + "," + y ); return true; } // Handle focus events public boolean gotFocus(Event e, Object what) { showLine("Got Focus"); return true; } public boolean lostFocus(Event e, Object what) { showLine("Lost Focus"); return true; } // Handle key down and key up events public boolean keyDown(Event e, int key) { int flags = e.modifiers; if (e.id == Event.KEY_PRESS) // a regular key showLine("Key Down: " + mods(flags) + key_name(e)); else if (e.id == Event.KEY_ACTION) // a function key showLine("Function Key Down: " + mods(flags) + function_key_name(key)); return true; } public boolean keyUp(Event e, int key) { int flags = e.modifiers; if (e.id == Event.KEY_RELEASE) // a regular key showLine("Key Up: " + mods(flags) + key_name(e)); else if (e.id == Event.KEY_ACTION_RELEASE) // a function key showLine("Function Key Up: " + mods(flags) + function_key_name(key)); return true; } // The remaining methods help us sort out the various modifiers and keys // Return the current list of modifier keys private String mods(int flags) { String s = " "; if (flags == 0) return ""; if ((flags & Event.SHIFT_MASK) != 0) s += "Shift "; if ((flags & Event.CTRL_MASK) != 0) s += "Control "; if ((flags & Event.META_MASK) != 0) s += "Meta "; if ((flags & Event.ALT_MASK) != 0) s += "Alt "; return s; } // Return the name of a regular (non-function) key. private String key_name(Event e) { char c = (char) e.key; if (e.controlDown()) { // If CTRL flag is set, handle control chars. if (c < ' ') { c += '@'; return "^" + c; } } else { // If CTRL flag is not set, then certain ASCII switch (c) { // control characters have special meaning. case '\n': return "Return"; case '\t': return "Tab"; case '\033': return "Escape"; case '\010': return "Backspace"; } } // Handle the remaining possibilities. if (c == '\177') return "Delete"; else if (c == ' ') return "Space"; else return String.valueOf(c); } // Return the name of a function key. Just compare the key to the // constants defined in the Event class. private String function_key_name(int key) { switch(key) { case Event.HOME: return "Home"; case Event.END: return "End"; case Event.PGUP: return "Page Up"; case Event.PGDN: return "Page Down"; case Event.UP: return "Up"; case Event.DOWN: return "Down"; case Event.LEFT: return "Left"; case Event.RIGHT: return "Right"; case Event.F1: return "F1"; case Event.F2: return "F2"; case Event.F3: return "F3"; case Event.F4: return "F4"; case Event.F5: return "F5"; case Event.F6: return "F6"; case Event.F7: return "F7"; case Event.F8: return "F8"; case Event.F9: return "F9"; case Event.F10: return "F10"; case Event.F11: return "F11"; case Event.F12: return "F12"; } return "Unknown Function Key"; } /** A list of lines to display in the window */ protected Vector lines = new Vector(); /** Add a new line to the list of lines, and redisplay */ protected void showLine(String s) { if (lines.size() == 20) lines.removeElementAt(0); lines.addElement(s); repaint(); } /** This method repaints the text in the window */ public void paint(Graphics g) { for(int i = 0; i < lines.size(); i++) g.drawString((String)lines.elementAt(i), 20, i*16 + 50); } } Learn about this subject
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