websch/method-draw/jquery-draginput.js

// Mark MacKay http://method.ac MIT License


$.fn.dragInput = function(cfg){
	return this.each(function(){

		this.repeating = false;
		// Apply specified options or defaults:
		// (Ought to refactor this some day to use $.extend() instead)
		this.dragCfg = {
			min: cfg && !isNaN(parseFloat(cfg.min)) ? Number(cfg.min) : null,	// Fixes bug with min:0
			max: cfg && !isNaN(parseFloat(cfg.max)) ? Number(cfg.max) : null,
			step: cfg && Number(cfg.step) ? cfg.step : 1,
			stepfunc: cfg && cfg.stepfunc ? cfg.stepfunc : false,
			dragAdjust: cfg && cfg.dragAdjust ? cfg.dragAdjust : 1,
			height: 70,
			cursor: cfg && cfg.cursor ? Boolean(cfg.cursor) : false,
			start: cfg && cfg.start ? Number(cfg.start) : 0,
			_btn_width: 20,
			_direction: null,
			_delay: null,
			_repeat: null,
			callback: cfg && cfg.callback ? cfg.callback : null
		};
		// if a smallStep isn't supplied, use half the regular step
		this.dragCfg.smallStep = cfg && cfg.smallStep ? cfg.smallStep : this.dragCfg.step/2;
		var dragAdjust = this.dragCfg.dragAdjust;
		var $label = $(this).parent();
		var $input = $(this);
		var cursorHeight = this.dragCfg.height;
		var min = this.dragCfg.min;
		var max = this.dragCfg.max
		var step = this.dragCfg.step
    var area = (max - min > 0) ?  (max - min) / step : 200;
    var scale = area/cursorHeight * step;
    var lastY = 0;
    var attr = this.getAttribute("data-attr");
    var canvas = svgEditor.canvas
    var selectedElems = canvas.getSelectedElems();
    var isTouch = svgedit.browser.isTouch();
    var $cursor = (area && this.dragCfg.cursor) 
      ? $("<div class='draginput_cursor' />").appendTo($label) 
      : false
    $input.attr("readonly", "readonly")
    if ($cursor && !isNaN(this.dragCfg.start)) $cursor.css("top", (this.dragCfg.start*-1)/scale+cursorHeight)
   
    //this is where all the magic happens  
		this.adjustValue = function(i, noUndo){
			var v;
			if(isNaN(this.value)) {
				v = this.dragCfg.reset;
			} else if($.isFunction(this.dragCfg.stepfunc)) {
				v = this.dragCfg.stepfunc(this, i);
			} else {
				// weirdest javascript bug ever: 5.1 + 0.1 = 5.199999999
				v = Number((Number(this.value) + Number(i)).toFixed(5));
			}
			if (max !== null) v = Math.min(v, max);
			if (min !== null) v = Math.max(v, min);
			if ($cursor) this.updateCursor(v);
			this.value = v;
			$label.attr("data-value", v)
			if ($.isFunction(this.dragCfg.callback)) this.dragCfg.callback(this, noUndo)
		};
          
		$label.toggleClass("draginput", $label.is("label"))
    
    // when the mouse is down and moving
    this.move = function(e, oy, val) {
      if (isTouch) {
        e = e.originalEvent.touches[0]
      }
      // just got started let's save for undo purposes
      if (lastY === 0) {
        lastY = oy;
      }
      var deltaY = (e.pageY - lastY) *-1
      lastY = e.pageY;
      val = (deltaY * scale) * dragAdjust
      var fixed = (step < 1) ? 1 : 0
      this.adjustValue(val.toFixed(fixed))  //no undo true
    };
  	
  	//when the mouse is released
  	this.stop = function() {
  	  $('body').removeClass('dragging');
  	  $label.removeClass("active")
  	  $(window).unbind("mousemove.draginput touchmove.draginput mouseup.draginput touchend.draginput");
  	  lastY = 0;
  	  if (selectedElems[0]) {
    	  var batchCmd = canvas.undoMgr.finishUndoableChange();
      	if (!batchCmd.isEmpty()) canvas.undoMgr.addCommandToHistory(batchCmd);
    	}
  	  this.adjustValue(0)
  	}
  	
  	this.updateCursor = function(){
  	  var value = parseFloat(this.value)
  		var pos = (value*-1)/scale+cursorHeight
  		$cursor.css("top", pos)
  	}
  	
  	this.start = function(e) {
  	  if (isTouch) e = e.originalEvent.touches[0]
		  var oy = e.pageY;
		  var val = this.value;
		  var el = this;
		  canvas.undoMgr.beginUndoableChange(attr, selectedElems)
		  $('body').addClass('dragging');
		  $label.addClass('active');
			$(window).bind("mousemove.draginput touchmove.draginput", function(e){el.move(e, oy, parseFloat(val))})
			$(window).bind("mouseup.draginput touchend.draginput", function(e){el.stop()})
  	}
  	
  	$(this)
		  .attr("readonly", "readonly")
		  .attr("data-scale", scale)
		  .attr("data-domain", cursorHeight)
		  .attr("data-cursor", ($cursor != false))
		  		
		.bind("mousedown touchstart", function(e){
		  this.blur();
		  this.start(e);
		})
		
		.bind("dblclick taphold", function(e) {
			this.removeAttribute("readonly", "readonly");
			this.focus();
			this.select();
		})
		
		.keydown(function(e){
		  // Respond to up/down arrow keys.
		  switch(e.keyCode){
		  	case 13: this.adjustValue(0); this.blur();  break; // Enter
		  }
		})
		
		.focus(function(e){
		  if (this.getAttribute("readonly") === "readonly") this.blur()
		})
		
		.blur(function(e){
		  this.setAttribute("readonly", "readonly")
		})
		
		.bind("mousewheel", function(e, delta, deltaX, deltaY){
			if (deltaY > 0)
				this.adjustValue(this.dragCfg.step);
			else if (deltaY < 0)
				this.adjustValue(-this.dragCfg.step);
			e.preventDefault();
		})
		
	});

	
};

// public function
$.fn.dragInput.updateCursor = function(el){
  var value = parseFloat(el.value);
  var scale = parseFloat(el.getAttribute("data-scale"));
  var domain = parseFloat(el.getAttribute("data-domain"));
	var pos = ((value*-1)/scale+domain) + "px";
	var cursor = el.parentNode.lastChild
	if (cursor.className == "draginput_cursor") cursor.style.top = pos;
}