Clickable.cpp

00001 /*
00002  *  Copyright 2014 Embedded Artists AB
00003  *
00004  *  Licensed under the Apache License, Version 2.0 (the "License");
00005  *  you may not use this file except in compliance with the License.
00006  *  You may obtain a copy of the License at
00007  *
00008  *    http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  *  Unless required by applicable law or agreed to in writing, software
00011  *  distributed under the License is distributed on an "AS IS" BASIS,
00012  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  *  See the License for the specific language governing permissions and
00014  *  limitations under the License.
00015  */
00016 
00017 #include "Clickable.h"
00018 #include "mbed.h"
00019 #include "DMBoard.h"
00020 
00021 #include "lpc_swim_font.h"
00022 
00023 Clickable::Clickable(COLOR_T* fb, uint16_t x, uint16_t y, uint16_t width, uint16_t height)
00024 {
00025   _enabled = true;
00026   _pressed = false;
00027   _func = NULL;
00028   
00029   Display* disp = DMBoard::instance().display();
00030     
00031   swim_window_open_noclear(
00032     &_win, 
00033     disp->width(), disp->height(),   // full size
00034     fb,
00035     x, y, x+width-1, y+height-1,     // window position and size
00036     0,                               // border
00037     BLACK, BLACK, BLACK);            // colors: pen, backgr, forgr
00038 }
00039 
00040 bool Clickable::handle(uint16_t x, uint16_t y, bool pressed)
00041 {
00042   bool needsRepaint = false;
00043   if (_enabled) {
00044     if (!pressed && _pressed) {
00045       // user released => click
00046       needsRepaint = true;
00047       _pressed = false;
00048       if (_func != NULL) {
00049         _func(_funcArg);
00050       }       
00051     }
00052     else if ((x >= _win.xpmin) && (y >= _win.ypmin) && (x <= _win.xpmax) && (y <= _win.ypmax)) {
00053       if (pressed && !_pressed) {
00054         // user pressing inside area
00055         needsRepaint = true;
00056         _pressed = true;
00057       } 
00058     }
00059     else if (_pressed) {
00060       // pressed but moved outside of the button area
00061       needsRepaint = true;
00062       _pressed = false;
00063     }
00064   }
00065   return needsRepaint;
00066 }
00067