powerkey.dot

/* -*- mode: c -*- */

/* Extra documentation for state transitions made while
 * handling power key presses.
 *
 * To create PNG image, execute:
 *   dot -Tpng powerkey.dot -o powerkey.png
 */

digraph display_state_machine {
  fontsize=10;
  label = "MCE POWERKEY STATE MACHINE";
  nodesep=0.3;
  ranksep=0.2;
  node[fontsize=6];
  edge[fontsize=6];
  edge[arrowsize=0.3];
  node[style=filled,fillcolor=skyblue,shape=box];
  node[width=0.00001];
  node[height=0.00001];

  node[fillcolor=yellow];

  IDLE;
  PRESSED;
  RELEASED;

  node[shape=oval,fillcolor=pink];

  IDLE     -> IDLE     [label=" released"];
  IDLE     -> PRESSED  [label=" pressed:\l start long press timer\l"];

  PRESSED  -> IDLE     [label=" long press timeout:\l execute long press actions\l"];

  PRESSED  -> RELEASED [label=" released:\l stop long press timer\l execute common actions\l start double press timer\l"];

  RELEASED -> IDLE     [label=" double press timeout:\l execute single press actions\l"];
  RELEASED -> IDLE     [label=" pressed:\l stop double press timer\l execute double press actions\l"];
}