--- /dev/null
+define("dojo/dnd/autoscroll", ["../_base/lang", "../sniff", "../_base/window", "../dom-geometry", "../dom-style", "../window"],
+ function(lang, has, win, domGeom, domStyle, winUtils){
+
+// module:
+// dojo/dnd/autoscroll
+
+var exports = {
+ // summary:
+ // Used by dojo/dnd/Manager to scroll document or internal node when the user
+ // drags near the edge of the viewport or a scrollable node
+};
+lang.setObject("dojo.dnd.autoscroll", exports);
+
+exports.getViewport = winUtils.getBox;
+
+exports.V_TRIGGER_AUTOSCROLL = 32;
+exports.H_TRIGGER_AUTOSCROLL = 32;
+
+exports.V_AUTOSCROLL_VALUE = 16;
+exports.H_AUTOSCROLL_VALUE = 16;
+
+// These are set by autoScrollStart().
+// Set to default values in case autoScrollStart() isn't called. (back-compat, remove for 2.0)
+var viewport,
+ doc = win.doc,
+ maxScrollTop = Infinity,
+ maxScrollLeft = Infinity;
+
+exports.autoScrollStart = function(d){
+ // summary:
+ // Called at the start of a drag.
+ // d: Document
+ // The document of the node being dragged.
+
+ doc = d;
+ viewport = winUtils.getBox(doc);
+
+ // Save height/width of document at start of drag, before it gets distorted by a user dragging an avatar past
+ // the document's edge
+ var html = win.body(doc).parentNode;
+ maxScrollTop = Math.max(html.scrollHeight - viewport.h, 0);
+ maxScrollLeft = Math.max(html.scrollWidth - viewport.w, 0); // usually 0
+};
+
+exports.autoScroll = function(e){
+ // summary:
+ // a handler for mousemove and touchmove events, which scrolls the window, if
+ // necessary
+ // e: Event
+ // mousemove/touchmove event
+
+ // FIXME: needs more docs!
+ var v = viewport || winUtils.getBox(doc), // getBox() call for back-compat, in case autoScrollStart() wasn't called
+ html = win.body(doc).parentNode,
+ dx = 0, dy = 0;
+ if(e.clientX < exports.H_TRIGGER_AUTOSCROLL){
+ dx = -exports.H_AUTOSCROLL_VALUE;
+ }else if(e.clientX > v.w - exports.H_TRIGGER_AUTOSCROLL){
+ dx = Math.min(exports.H_AUTOSCROLL_VALUE, maxScrollLeft - html.scrollLeft); // don't scroll past edge of doc
+ }
+ if(e.clientY < exports.V_TRIGGER_AUTOSCROLL){
+ dy = -exports.V_AUTOSCROLL_VALUE;
+ }else if(e.clientY > v.h - exports.V_TRIGGER_AUTOSCROLL){
+ dy = Math.min(exports.V_AUTOSCROLL_VALUE, maxScrollTop - html.scrollTop); // don't scroll past edge of doc
+ }
+ window.scrollBy(dx, dy);
+};
+
+exports._validNodes = {"div": 1, "p": 1, "td": 1};
+exports._validOverflow = {"auto": 1, "scroll": 1};
+
+exports.autoScrollNodes = function(e){
+ // summary:
+ // a handler for mousemove and touchmove events, which scrolls the first available
+ // Dom element, it falls back to exports.autoScroll()
+ // e: Event
+ // mousemove/touchmove event
+
+ // FIXME: needs more docs!
+
+ var b, t, w, h, rx, ry, dx = 0, dy = 0, oldLeft, oldTop;
+
+ for(var n = e.target; n;){
+ if(n.nodeType == 1 && (n.tagName.toLowerCase() in exports._validNodes)){
+ var s = domStyle.getComputedStyle(n),
+ overflow = (s.overflow.toLowerCase() in exports._validOverflow),
+ overflowX = (s.overflowX.toLowerCase() in exports._validOverflow),
+ overflowY = (s.overflowY.toLowerCase() in exports._validOverflow);
+ if(overflow || overflowX || overflowY){
+ b = domGeom.getContentBox(n, s);
+ t = domGeom.position(n, true);
+ }
+ // overflow-x
+ if(overflow || overflowX){
+ w = Math.min(exports.H_TRIGGER_AUTOSCROLL, b.w / 2);
+ rx = e.pageX - t.x;
+ if(has("webkit") || has("opera")){
+ // FIXME: this code should not be here, it should be taken into account
+ // either by the event fixing code, or the domGeom.position()
+ // FIXME: this code doesn't work on Opera 9.5 Beta
+ rx += win.body().scrollLeft;
+ }
+ dx = 0;
+ if(rx > 0 && rx < b.w){
+ if(rx < w){
+ dx = -w;
+ }else if(rx > b.w - w){
+ dx = w;
+ }
+ oldLeft = n.scrollLeft;
+ n.scrollLeft = n.scrollLeft + dx;
+ }
+ }
+ // overflow-y
+ if(overflow || overflowY){
+ //console.log(b.l, b.t, t.x, t.y, n.scrollLeft, n.scrollTop);
+ h = Math.min(exports.V_TRIGGER_AUTOSCROLL, b.h / 2);
+ ry = e.pageY - t.y;
+ if(has("webkit") || has("opera")){
+ // FIXME: this code should not be here, it should be taken into account
+ // either by the event fixing code, or the domGeom.position()
+ // FIXME: this code doesn't work on Opera 9.5 Beta
+ ry += win.body().scrollTop;
+ }
+ dy = 0;
+ if(ry > 0 && ry < b.h){
+ if(ry < h){
+ dy = -h;
+ }else if(ry > b.h - h){
+ dy = h;
+ }
+ oldTop = n.scrollTop;
+ n.scrollTop = n.scrollTop + dy;
+ }
+ }
+ if(dx || dy){ return; }
+ }
+ try{
+ n = n.parentNode;
+ }catch(x){
+ n = null;
+ }
+ }
+ exports.autoScroll(e);
+};
+
+return exports;
+
+});
git.wh0rd.org / tt-rss.git / blobdiff