Option to select area with touchscreen

[serako]

I think you can have an option if we prefer have elevation zoom aera or indicator if we have a touch screen. because with touch screen it's not nice for moving the indicator!

for use with prefer indicator (i not implemented a condition with option!)
line 134 now 434 (but i don't try with our last modif)

    if (L.Browser.touch) {
      background (new focusrect?)
        .on("touchmove", this._mousemoveHandler.bind(this));
    //    .on("touchmove.drag", this._dragHandler.bind(this))
    //    .on("touchstart.drag", this._dragStartHandler.bind(this))
    //    .on("touchstart.focus", this._mousemoveHandler.bind(this));
    //  L.DomEvent.on(this._container, 'touchend', this._dragEndHandler, this);
    }

[Raruto]

from the original library i have found this (already pending) pull request: MrMufflon/Leaflet.Elevation#73 (it could it be related to this?)
otherwise, could you try to provide a more detailed example on how it could be solved?

[serako]

I propose you modify on your last commit :
I do a just a little test, and i think it's OK. I test with firefox on simulate Samsung Galaxy S9

on line 37
screenTouchAction: 'selectArea', // possible value 'moveIndicator' and 'selectArea'

on line 430 (just add the test in "if (L.Browser.mobile) {" and add .on("touchmove", this._mousemoveHandler.bind(this));

  _appendFocusRect: function(g) {
    var focusRect = this._focusRect = g.append("rect")
      .attr("width", this._width())
      .attr("height", this._height())
      .style("fill", "none")
      .style("stroke", "none")
      .style("pointer-events", "all");

    if (L.Browser.mobile) {
      if (this.options.screenTouchAction == 'selectArea') {
        focusRect
          .on("touchmove.drag", this._dragHandler.bind(this))
          .on("touchstart.drag", this._dragStartHandler.bind(this))
          .on("touchstart.focus", this._mousemoveHandler.bind(this));
        L.DomEvent.on(this._container, 'touchend', this._dragEndHandler, this);
      } else {
        focusRect
          .on("touchmove", this._mousemoveHandler.bind(this));
      }
    }

    focusRect
      .on("mousemove.drag", this._dragHandler.bind(this))
      .on("mousedown.drag", this._dragStartHandler.bind(this))
      .on("mousemove.focus", this._mousemoveHandler.bind(this))
      .on("mouseout.focus", this._mouseoutHandler.bind(this));
    L.DomEvent.on(this._container, 'mouseup', this._dragEndHandler, this);
  },

[Raruto]

in version 0.2.6 i've introduced a "enable/disable" dragging mechanism (for mobile it is disabled by default), is it ok?