javascript - Undo/Redo for send forward & bring backward functionality in canvas with fabric.js -


i using fabric.js creating customized shoe design. wanted add undo & redo functionality & done fiddle link.

i used below code pushing canvas state.

function changelayer(direction) {                     var activeobject = canvas.getactiveobject();                     if (activeobject) {                         if (direction == 'fore')                             console.log(canvas.bringforward(activeobject));                         else                             console.log(canvas.sendbackwards(activeobject));                     }                     pushstate();                  }  function pushstate() {                     if (replayflag === false) { // i.e. user modified something..                         var itemprops = [];                         (var in selectedobject) {                             itemprops.push({                                 "itemnum": selectedobject[i].itemnum,                                 "left": selectedobject[i].left,                                 "top": selectedobject[i].top,                                 "scalex": selectedobject[i].scalex,                                 "scaley": selectedobject[i].scaley,                                 "angle": selectedobject[i].angle,                                 "flipx": selectedobject[i].flipx,                                 "flipy": selectedobject[i].flipy,                                 "fill": selectedobject[i].fill,                                 "fontsize": selectedobject[i].fontsize,                                 "fontfamily": selectedobject[i].fontfamily,                                 "textbackgroundcolor": selectedobject[i].textbackgroundcolor,                                 "fontweight": selectedobject[i].fontweight,                                 "fontstyle": selectedobject[i].fontstyle,                                 "textdecoration": selectedobject[i].textdecoration                             });                         }                          // current object properties                          onobjectselected();                          undohist.push({                             "action": "modify",                             "itemprops": itemprops                         });                         redohist = [];                     }                 }

when bring element forward or backward, undo/redo functionality doesn't work properly.


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