Java Terminal Implementation

Import Java. AWT. *; import javax. swing. *; import Java. AWT. event. *; import Java. AWT. font. texthitinfo; import Java. AWT. im. inputmethodrequests; import Java. text. attributedcharacteriterator; import Java. text. attributedcharacteriterator. attribute; import Java. util. arraylist; import Java. util. list; public class testterminal extends jframe implements policykeylistener {private mydisplay disp = NULL; private datamodel dm = NULL; Public testterminal () {This. setsize (300,200); this. setdefaclocloseoperation (windowconstants. dispose_on_close); this. setcontentpane (getjcontentpane (); this. settitle ("jframe"); this. setvisible (true);} private jpanel getjcontentpane () {jpanel jcontentpane = NULL; If (jcontentpane = NULL) {jcontentpane = new jpanel (); jcontentpane. setlayout (New borderlayout (); DM = new datamodel (); disp = new mydisplay (DM); Disp. setpolicykeylistener (this); jcontentpane. add (New jscrollpane (disp), borderlayout. center);} return jcontentpane;} public static void main (string ARGs []) {New testterminal ();} public void every Y (keyevent e) {try {int c = E. getkeychar (); If (C = 7) {toolkit. getdefatooltoolkit (). beep (); return;} If (C = 8) {DM. setcursorcol (DM. getcursorcol ()-1); Disp. repaint (); return;} If (C = 13) {return;} If (C = 10) {DM. setcursorrow (DM. getcursorrow () + 1); DM. setcursorcol (0); DM. addnewline (DM. getcursorrow (); Disp. updatescrollbar ("down"); Disp. repaint (); return;} DM. writechar (char) C); DM. setcursorcol (DM. getcursorcol () + 1); Disp. repaint ();} catch (exception dx) {dx. printstacktrace () ;}} class mydisplay extends jpanel implements keylistener, listener, componentlistener, inputmethodlistener, listener, scrollable {Private Static final long serialversionuid = 1l; private datamodel dm = NULL; private jscrollbar scrollbar = new jscrollbar (jscrollbar. vertical); Private color fcolor = color. white; private color bcolor = color. black; private int topvalue = 0; private Boolean isdiaplayinputkey = false; private notifykeylistener keylistnerer = NULL; Public mydisplay (datamodel DM) {This. dm = DM; this. setfocusable (true); this. addkeylistener (this); this. setlayout (New borderlayout (); this. addcomponentlistener (this); this. add (scrollbar, borderlayout. east); scrollbar. addadjustmentlistener (this); enableinputmethods (true); addinputmethodlistener (this);} public inputmethodrequests listener () {return this;} public void setpolicykeylistener (policykeylistener listener) {This. keylistnerer = listener;} public void keypressed (keyevent e) {If (isdiaplayinputkey = false) {This. keylistnerer. Y (E); return;} switch (E. getkeycode () {Case keyevent. vk_back_space: If (DM. getcursorcol () = 0) {toolkit. getdefatooltoolkit (). beep (); return;} DM. setcursorcol (DM. getcursorcol ()-1); DM. deletechar (DM. getcursorrow (), DM. getcursorcol (); break; Case keyevent. vk_enter: DM. setcursorrow (DM. getcursorrow () + 1); DM. setcursorcol (0); DM. addnewline (DM. getcursorrow (); this. updatescrollbar ("down"); break; Case keyevent. vk_left: If (DM. getcursorcol () = 0) {toolkit. getdefatooltoolkit (). beep (); return;} DM. setcursorcol (DM. getcursorcol ()-1); break; Case keyevent. vk_right: If (DM. getcursorcol () = DM. rowlength (DM. getcursorrow () {toolkit. getdefatooltoolkit (). beep (); return;} DM. setcursorcol (DM. getcursorcol () + 1); break; Case keyevent. vk_up: If (DM. getcursorrow () = 0) {toolkit. getdefatooltoolkit (). beep (); return;} DM. setcursorrow (DM. getcursorrow ()-1); If (DM. getcursorcol ()> DM. rowlength (DM. getcursorrow () {DM. setcursorcol (DM. rowlength (DM. getcursorrow ();} This. updatescrollbar ("up"); break; Case keyevent. vk_down: If (DM. getcursorrow () = DM. rowsize ()-1) {toolkit. getdefatooltoolkit (). beep (); return;} DM. setcursorrow (DM. getcursorrow () + 1); If (DM. getcursorcol ()> DM. rowlength (DM. getcursorrow () {DM. setcursorcol (DM. rowlength (DM. getcursorrow ();} This. updatescrollbar ("down"); break; Case keyevent. vk_home: DM. setcursorcol (0); break; Case keyevent. vk_end: DM. setcursorcol (DM. rowlength (DM. getcursorrow (); break; Case keyevent. vk_delete: If (DM. getcursorcol () = DM. rowlength (DM. getcursorrow () {toolkit. getdefatooltoolkit (). beep (); return;} DM. deletechar (DM. getcursorrow (), DM. getcursorcol (); break; Case keyevent. vk_f1: Case keyevent. vk_f2: Case keyevent. vk_f3: Case keyevent. vk_f4: Case keyevent. vk_f5: Case keyevent. vk_f6: Case keyevent. vk_f7: Case keyevent. vk_f8: Case keyevent. vk_f9: Case keyevent. vk_f10: Case keyevent. vk_f11: Case keyevent. vk_f12: Case keyevent. vk_tab: Case keyevent. vk_escape: Case keyevent. vk_page_up: Case keyevent. vk_page_down: Case keyevent. vk_shift: Case keyevent. vk_caps_lock: break; default: DM. insertchar (E. getkeychar (); DM. setcursorcol (DM. getcursorcol () + 1);} This. updateui ();} public void paintcomponent (Graphics g) {G. setcolor (bcolor); G. fillrect (0, 0, this. getwidth (), this. getheight (); G. setcolor (fcolor); fontmetrics fm = This. getgraphics (). getfontmetrics (); int offsety = FM. charwidth (& apos; yellow & apos;); For (int row = 0; row
 
  
This. getheight () {scrollbar. setenabled (true);} else {scrollbar. setenabled (false);} scrollbar. setminimum (0); scrollbar. setmaximum (DM. rowsize ()-newrows); If (Org! = NULL & ORG. equals ("down") {If (DM. getcursorrow ()> = (this. getheight ()/FM. getheight () {scrollbar. setvalue (scrollbar. getvalue () + 1) ;}} if (Org! = NULL & ORG. Equals ("up") {If (DM. getcursorrow ()
  
   
This. cursorcol) {sb. deletecharat (this. cursorcol);} sb. insert (this. cursorcol, c);} public void insertchar (char c) {If (lines. size () = This. cursorrow) {lines. add (New stringbuffer ();} stringbuffer sb = (stringbuffer) lines. get (this. cursorrow); sb. insert (this. cursorcol, c);} public void addnewline (INT row) {This. lines. add (row, new stringbuffer ();} public void deletechar (INT row, int col) {stringbuffer sb = (stringbuffer) lines. get (ROW); sb. deletecharat (COL);} public int rowsize () {return lines. size ();} public int rowlength (INT row) {return (stringbuffer) lines. get (ROW )). length () ;}} interface policykeylistener {public void Policy (keyevent E );}