Subversion Repositories Applications.papyrus

if(!dojo._hasResource["dojo.dnd.autoscroll"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojo.dnd.autoscroll"] = true;
dojo.provide("dojo.dnd.autoscroll");

dojo.dnd.getViewport = function(){
        // summary: returns a viewport size (visible part of the window)

        // FIXME: need more docs!!
        var d = dojo.doc, dd = d.documentElement, w = window, b = dojo.body();
        if(dojo.isMozilla){
                return {w: dd.clientWidth, h: w.innerHeight};   // Object
        }else if(!dojo.isOpera && w.innerWidth){
                return {w: w.innerWidth, h: w.innerHeight};             // Object
        }else if (!dojo.isOpera && dd && dd.clientWidth){
                return {w: dd.clientWidth, h: dd.clientHeight}; // Object
        }else if (b.clientWidth){
                return {w: b.clientWidth, h: b.clientHeight};   // Object
        }
        return null;    // Object
};

dojo.dnd.V_TRIGGER_AUTOSCROLL = 32;
dojo.dnd.H_TRIGGER_AUTOSCROLL = 32;

dojo.dnd.V_AUTOSCROLL_VALUE = 16;
dojo.dnd.H_AUTOSCROLL_VALUE = 16;

dojo.dnd.autoScroll = function(e){
        // summary:
        //              a handler for onmousemove event, which scrolls the window, if
        //              necesary
        // e: Event:
        //              onmousemove event

        // FIXME: needs more docs!
        var v = dojo.dnd.getViewport(), dx = 0, dy = 0;
        if(e.clientX < dojo.dnd.H_TRIGGER_AUTOSCROLL){
                dx = -dojo.dnd.H_AUTOSCROLL_VALUE;
        }else if(e.clientX > v.w - dojo.dnd.H_TRIGGER_AUTOSCROLL){
                dx = dojo.dnd.H_AUTOSCROLL_VALUE;
        }
        if(e.clientY < dojo.dnd.V_TRIGGER_AUTOSCROLL){
                dy = -dojo.dnd.V_AUTOSCROLL_VALUE;
        }else if(e.clientY > v.h - dojo.dnd.V_TRIGGER_AUTOSCROLL){
                dy = dojo.dnd.V_AUTOSCROLL_VALUE;
        }
        window.scrollBy(dx, dy);
};

dojo.dnd._validNodes = {"div": 1, "p": 1, "td": 1};
dojo.dnd._validOverflow = {"auto": 1, "scroll": 1};

dojo.dnd.autoScrollNodes = function(e){
        // summary:
        //              a handler for onmousemove event, which scrolls the first avaialble
        //              Dom element, it falls back to dojo.dnd.autoScroll()
        // e: Event:
        //              onmousemove event

        // FIXME: needs more docs!
        for(var n = e.target; n;){
                if(n.nodeType == 1 && (n.tagName.toLowerCase() in dojo.dnd._validNodes)){
                        var s = dojo.getComputedStyle(n);
                        if(s.overflow.toLowerCase() in dojo.dnd._validOverflow){
                                var b = dojo._getContentBox(n, s), t = dojo._abs(n, true);
                                // console.debug(b.l, b.t, t.x, t.y, n.scrollLeft, n.scrollTop);
                                b.l += t.x + n.scrollLeft;
                                b.t += t.y + n.scrollTop;
                                var w = Math.min(dojo.dnd.H_TRIGGER_AUTOSCROLL, b.w / 2), 
                                        h = Math.min(dojo.dnd.V_TRIGGER_AUTOSCROLL, b.h / 2),
                                        rx = e.pageX - b.l, ry = e.pageY - b.t, dx = 0, dy = 0;
                                if(rx > 0 && rx < b.w){
                                        if(rx < w){
                                                dx = -dojo.dnd.H_AUTOSCROLL_VALUE;
                                        }else if(rx > b.w - w){
                                                dx = dojo.dnd.H_AUTOSCROLL_VALUE;
                                        }
                                }
                                //console.debug("ry =", ry, "b.h =", b.h, "h =", h);
                                if(ry > 0 && ry < b.h){
                                        if(ry < h){
                                                dy = -dojo.dnd.V_AUTOSCROLL_VALUE;
                                        }else if(ry > b.h - h){
                                                dy = dojo.dnd.V_AUTOSCROLL_VALUE;
                                        }
                                }
                                var oldLeft = n.scrollLeft, oldTop = n.scrollTop;
                                n.scrollLeft = n.scrollLeft + dx;
                                n.scrollTop  = n.scrollTop  + dy;
                                // if(dx || dy){ console.debug(oldLeft + ", " + oldTop + "\n" + dx + ", " + dy + "\n" + n.scrollLeft + ", " + n.scrollTop); }
                                if(oldLeft != n.scrollLeft || oldTop != n.scrollTop){ return; }
                        }
                }
                try{
                        n = n.parentNode;
                }catch(x){
                        n = null;
                }
        }
        dojo.dnd.autoScroll(e);
};

}