Menu.cpp

00001 #include "Menu.h"
00002 #include "mbed.h"
00003 #include <string>
00004 
00005 //Drive the menu system
00006 
00007 //Initialise and attach button handlers
00008 Menu::Menu(TextLCD* _screen, PinName ok, PinName left, PinName right)
00009 {
00010     screen = _screen;
00011     
00012     entryCount = 0;
00013     
00014     position = 0;
00015     
00016     btnOK = new PinDetect(ok, PullUp);
00017     btnLeft = new PinDetect(left, PullUp);
00018     btnRight = new PinDetect(right, PullUp);
00019     
00020     btnOK->attach_deasserted(this, &Menu::enter);
00021     btnOK->attach_asserted_held(this, &Menu::done);
00022 
00023     btnLeft->attach_asserted(this, &Menu::left);
00024     btnLeft->attach_asserted_held(this, &Menu::leftHeld);
00025     btnLeft->attach_deasserted(this, &Menu::cancelLeftHeld);
00026     
00027     btnRight->attach_asserted(this, &Menu::right);
00028     btnRight->attach_asserted_held(this, &Menu::rightHeld);
00029     btnRight->attach_deasserted(this, &Menu::cancelRightHeld);
00030 
00031     btnOK->setAssertValue(0);
00032     btnLeft->setAssertValue(0);
00033     btnRight->setAssertValue(0);
00034 
00035     btnOK->setSampleFrequency();
00036     btnLeft->setSampleFrequency();
00037     btnRight->setSampleFrequency();
00038     
00039     ignoreNextEnter = false;
00040 }
00041 
00042 void Menu::refresh()
00043 {
00044     //Create chars (if needed) for left and right arrows and editable indicator
00045     char labelLeft = (!edit & position > 0)?leftArrow:' ';
00046     char labelRight = (!edit & position < entryCount)?rightArrow:' ';
00047     char editIndic = (entries[position]->editable)?'*':' ';
00048 
00049     screen->locate(0, 0);
00050     
00051     //If position is on an entry, display it
00052     if(position <= entryCount - 1)
00053     {
00054         screen->printf("%c%-14s%c", labelLeft, (entries[position])->label.c_str(), labelRight);
00055         
00056         char editLeft = (edit)?'-':editIndic;
00057         char editRight = (edit)?'+':' ';
00058         
00059         screen->putc(editLeft);
00060         screen->printf(entries[position]->getFormatted().c_str());
00061         screen->locate(15, 1);
00062         screen->putc(editRight);
00063     }
00064     //Otherwise show the return command
00065     else
00066     {    
00067         screen->printf("%cReturn                         ", leftArrow);
00068     }
00069 }
00070 
00071 //Handler for enter button
00072 void Menu::enter()
00073 {
00074     //Menu not on screen, display it
00075     if(!display && !ignoreNextEnter)
00076     {   
00077         display = true;
00078         edit = false;
00079     }
00080     //Menu on screen
00081     else
00082     {
00083         //On an entry
00084         if(position <= entryCount - 1)
00085         {
00086             //If its editable, toggle edit status
00087             if(entries[position]->editable)
00088                 edit = !edit;
00089         }
00090         //On return
00091         else
00092         {
00093             //Return, resetting position first
00094             position = 0;
00095             done();
00096         }
00097     }
00098     
00099     ignoreNextEnter = false;
00100 }
00101 
00102 //Handler for enter held, clear the menu retaining position
00103 void Menu::done()
00104 {
00105     //Hide the menu
00106     display = false;
00107     //TODO: Can't remember why I needed this
00108     ignoreNextEnter = true;
00109 }
00110 
00111 //Handler for left button
00112 void Menu::left()
00113 {
00114     //If not editing, scroll
00115     if(!edit && display && position > 0)
00116         position--;
00117     //If editing, edit
00118     else if(edit)
00119         entries[position]->decrement();
00120 }
00121 
00122 //Handler for left button held, start scrolling through menu.
00123 void Menu::leftHeld()
00124 {
00125     left();
00126     leftHeldTimeout.attach(this, &Menu::leftHeld, holdRepeatTime);
00127 }
00128 
00129 //Handler for left button release, stop scrolling
00130 void Menu::cancelLeftHeld()
00131 {
00132     leftHeldTimeout.detach();
00133 }
00134 
00135 //Same as left
00136 void Menu::right()
00137 {
00138     if(!edit && display && position < entryCount)
00139         position++;
00140     else if(edit)
00141         entries[position]->increment();
00142 }
00143 
00144 //Same as left
00145 void Menu::rightHeld()
00146 {
00147     right();
00148     rightHeldTimeout.attach(this, &Menu::rightHeld, holdRepeatTime);
00149 }
00150 
00151 //Same as left
00152 void Menu::cancelRightHeld()
00153 {
00154     rightHeldTimeout.detach();
00155 }