editorcontent.js

完美的在线教育系统

/***********************************************************************
** Title.........:  Online Image Editor Interface
** Version.......:  1.0
** Author........:  Xiang Wei ZHUO <[e-mail]>
** Filename......:  EditorContents.js
** Last changed..:  31 Mar 2004 
** Notes.........:  Handles most of the interface routines for the ImageEditor.
*
* Added:  29 Mar 2004  - Constrainted resizing/scaling
**/ 


function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

var pic_x, pic_y;
function P7_Snap() { //v2.62 by PVII
  var x,y,ox,bx,oy,p,tx,a,b,k,d,da,e,el,args=P7_Snap.arguments;a=parseInt(a);
  for (k=0; k<(args.length-3); k+=4)
   if ((g=MM_findObj(args[k]))!=null) {
    el=eval(MM_findObj(args[k+1]));
    a=parseInt(args[k+2]);b=parseInt(args[k+3]);
    x=0;y=0;ox=0;oy=0;p="";tx=1;da="document.all['"+args[k]+"']";
    if(document.getElementById) {
     d="document.getElementsByName('"+args[k]+"')[0]";
     if(!eval(d)) {d="document.getElementById('"+args[k]+"')";if(!eval(d)) {d=da;}}
    }else if(document.all) {d=da;} 
    if (document.all || document.getElementById) {
     while (tx==1) {p+=".offsetParent";
      if(eval(d+p)) {x+=parseInt(eval(d+p+".offsetLeft"));y+=parseInt(eval(d+p+".offsetTop"));
      }else{tx=0;}}
     ox=parseInt(g.offsetLeft);oy=parseInt(g.offsetTop);var tw=x+ox+y+oy;
     if(tw==0 || (navigator.appVersion.indexOf("MSIE 4")>-1 && navigator.appVersion.indexOf("Mac")>-1)) {
      ox=0;oy=0;if(g.style.left){x=parseInt(g.style.left);y=parseInt(g.style.top);
      }else{var w1=parseInt(el.style.width);bx=(a<0)?-5-w1:-10;
      a=(Math.abs(a)<1000)?0:a;b=(Math.abs(b)<1000)?0:b;
      //alert(event.clientX);
	  if (window.event == null) x=document.body.scrollLeft + bx;
		else x=document.body.scrollLeft + event.clientX + bx;
	  if (window.event == null) y=document.body.scrollTop;
		else y=document.body.scrollTop + event.clientY;}}
   }else if (document.layers) {x=g.x;y=g.y;var q0=document.layers,dd="";
    for(var s=0;s<q0.length;s++) {dd='document.'+q0[s].name;
     if(eval(dd+'.document.'+args[k])) {x+=eval(dd+'.left');y+=eval(dd+'.top');break;}}}
   if(el) {e=(document.layers)?el:el.style;
   var xx=parseInt(x+ox+a),yy=parseInt(y+oy+b);
   //alert(xx+":"+yy);
   if(navigator.appName=="Netscape" && parseInt(navigator.appVersion)>4){xx+="px";yy+="px";}
   if(navigator.appVersion.indexOf("MSIE 5")>-1 && navigator.appVersion.indexOf("Mac")>-1){
    xx+=parseInt(document.body.leftMargin);yy+=parseInt(document.body.topMargin);
    xx+="px";yy+="px";}e.left=xx;e.top=yy;}
    pic_x = parseInt(xx); pic_y = parseInt(yy);
    //alert(xx+":"+yy);
    }
}

var ie=document.all
var ns6=document.getElementById&&!document.all

var dragapproved=false
var z,x,y,status, ant, canvas, content, pic_width, pic_height, image, resizeHandle, oa_w, oa_h, oa_x, oa_y, mx2, my2;


function init_resize() 
{
    if(mode == "scale") 
    {
        P7_Snap('theImage','ant',0,0);

        if (canvas == null)
            canvas = MM_findObj("imgCanvas");

        if (pic_width == null || pic_height == null)
        {
            image = MM_findObj("theImage");
            pic_width = image.width;
            pic_height = image.height;
        }
        
        if (ant == null)
            ant = MM_findObj("ant");

        ant.style.left = pic_x; ant.style.top = pic_y;
        ant.style.width = pic_width; ant.style.height = pic_height;
        ant.style.visibility = "visible";

        drawBoundHandle();
        jg_doc.paint();
    }
}

initEditor = function () 
{
    init_crop();
    init_resize();
    var markerImg = MM_findObj('markerImg', window.top.document);

    if (markerImg.src.indexOf("img/t_white.gif")>0)
        toggleMarker() ;
}

function init_crop() 
{
    //if(mode == "crop") {
        P7_Snap('theImage','ant',0,0);
    //}
}

function setMode(newMode) 
{
    mode = newMode;
    reset();
}

function reset() 
{
    if (ant == null)
        ant = MM_findObj("ant");

    ant.style.visibility = "hidden";
    ant.style.left = 0;
    ant.style.top = 0;
    ant.style.width = 0;
    ant.style.height = 0;

    mx2 = null;
    my2 = null;

    jg_doc.clear();
    if(mode != 'measure')
        showStatus();   

    if(mode == "scale") {
        init_resize();
    }

    P7_Snap('theImage','ant',0,0);
}

function toggleMarker() 
{
    //alert("Toggle");
    if (ant == null)
        ant = MM_findObj("ant");

    if(ant.className=="selection")
        ant.className="selectionWhite";
    else
        ant.className="selection";
    
    if (jg_doc.getColor() == "#000000")
        jg_doc.setColor("#FFFFFF");
    else
        jg_doc.setColor("#000000");
    
    drawBoundHandle
    jg_doc.paint();
}


function move(e)
{
    if (dragapproved)
    {
        //z.style.left=ns6? temp1+e.clientX-x: temp1+event.clientX-x
        //z.style.top=ns6? temp2+e.clientY-y : temp2+event.clientY-y
        var w = ns6? temp1+e.clientX - x : temp1+event.clientX - x;
        var h = ns6? temp2+e.clientY - y : temp2+event.clientY - y;

        //alert(canvas.style.left);
        /*if (status !=null)
        {
            status.innerHTML  = "x:"+x+" y:"+y+" w:"+w+" h:"+h+" can_h:"+pic_height;
            status.innerHTML += " can_w:"+pic_width+" px:"+pic_x+" py:"+pic_y;
            status.innerHTML += " pix:"+image.style.left+" piy:"+image.style.top+" obj:"+obj.id;
        }*/

        /*jg_doc.clear();
        jg_doc.fillRectPattern(0,0,Math.abs(w),Math.abs(h),pattern);
        jg_doc.paint();
*/
        if (ant != null)
        {
            if (w >= 0)
            {
                ant.style.left = x;
                ant.style.width = w;
            }
            else
            {
                ant.style.left = x+w;
                ant.style.width = -1*w;
            }

            if (h >= 0)
            {
                ant.style.top = y;
                ant.style.height = h;
            }
            else
            {
                ant.style.top = y+h;
                ant.style.height = -1*h
            }
        }
        
        showStatus();
        return false
    }
}

function moveContent(e) 
{
    if (dragapproved)
    {

        var dx =ns6? oa_x + e.clientX-x: oa_x + event.clientX-x
        var dy =ns6? oa_y + e.clientY-y : oa_y + event.clientY-y


        /*if (status !=null)
        {
            status.innerHTML  = "x:"+x+" y:"+y+" dx:"+dx+" dy:"+dy;
        }*/

        ant.style.left = dx;
        ant.style.top = dy;

        showStatus();

        return false;
    }
}

//Code add for constraints by Fr閐閞ic Klee <[e-mail]>
function moveHandle(e) 
{
    if (dragapproved)
    {
        var w = ns6? e.clientX - x : event.clientX - x;
        var h = ns6? e.clientY - y : event.clientY - y;
        
		var constrained = MM_findObj('constProp', window.top.document);
        var orginal_height = document.theImage.height ;
        var orginal_width = document.theImage.width ;
        rapp = orginal_width/orginal_height ;
        rapp_inv = orginal_height / orginal_width ;

        switch(resizeHandle) 
        {

            case "s-resize":
                if (oa_h + h >= 0) 
				{
                    ant.style.height = oa_h + h;
					if(constrained.checked) 
					{
						ant.style.width = rapp * (oa_h + h) ;
                        ant.style.left = oa_x - rapp * h/2;
					}

				}
                break;
            case "e-resize":
                if(oa_w + w >= 0)
				{
                    ant.style.width = oa_w + w;
					if(constrained.checked) 
					{
                        ant.style.height = rapp_inv * (oa_w + w) ;
                        ant.style.top = oa_y - rapp_inv * w/2;
                    }

				}
                break;
            case "n-resize":
                if (oa_h - h >= 0)
                {
                    ant.style.top = oa_y + h;
                    ant.style.height = oa_h - h;
					if(constrained.checked) 
					{
						ant.style.width = rapp * (oa_h - h) ;
                        ant.style.left = oa_x + rapp * h/2;
                    }

                }
                break;
            case "w-resize":
                if(oa_w - w >= 0) 
				{
                    ant.style.left = oa_x + w;
                    ant.style.width = oa_w - w;
					if(constrained.checked) 
					{
						ant.style.height = rapp_inv * (oa_w - w) ;
						ant.style.top = oa_y + rapp_inv * w/2;
                    }

                }break;
            case "nw-resize":
                if(oa_h - h >= 0 && oa_w - w >= 0) {
                    ant.style.left = oa_x + w;
                    ant.style.width = oa_w - w;
                    ant.style.top = oa_y + h;
                    if(constrained.checked) 
                        ant.style.height = rapp_inv * (oa_w - w) ;
                    else
                        ant.style.height = oa_h - h;
                }
            break;
            case "ne-resize":
                if (oa_h - h >= 0 && oa_w + w >= 0){
                    ant.style.top = oa_y + h;
					ant.style.width = oa_w + w;
					if(constrained.checked) 
                        ant.style.height = rapp_inv * (oa_w + w) ;
                    else
                        ant.style.height = oa_h - h;
                }
                break;
            case "se-resize":
                if (oa_h + h >= 0 && oa_w + w >= 0) 
                {
                    ant.style.width = oa_w + w;
                    if(constrained.checked)
                        ant.style.height = rapp_inv * (oa_w + w) ;
                    else
                        ant.style.height = oa_h + h;
                }
                break;
            case "sw-resize":
                if (oa_h + h >= 0 && oa_w - w >= 0)
                {
                    ant.style.left = oa_x + w;
                    ant.style.width = oa_w - w;
					if(constrained.checked)
                        ant.style.height = rapp_inv * (oa_w - w) ;
                    else
                       ant.style.height = oa_h + h;
				}
        }
        
        showStatus();
        return false;
        
    }
}

function drags(e)
{
    if (!ie&&!ns6)
        return
    
    var firedobj=ns6? e.target : event.srcElement
    var topelement=ns6? "HTML" : "BODY"

    while (firedobj.tagName!=topelement&&
            !(firedobj.className=="crop" 
                || firedobj.className=="handleBox" 
                || firedobj.className=="selection" || firedobj.className=="selectionWhite"))
    {
        firedobj=ns6? firedobj.parentNode : firedobj.parentElement
    }

    if(firedobj.className=="handleBox") {
        
        if(content != null) {