// JavaScript Document

function dw_Slidebar(barId, trackId, axis, x, y) {
var bar = document.getElementById(barId);
var track = document.getElementById(trackId);
this.barId = barId; this.trackId = trackId;
this.axis = axis; this.x = x || 0; this.y = y || 0;
dw_Slidebar.col[this.barId] = this;
this.bar = bar; this.shiftTo(x, y);
// hold for setBarSize
this.trkHt = track.offsetHeight;
this.trkWd = track.offsetWidth;
if (axis == 'v') {
this.maxY = this.trkHt - bar.offsetHeight - y;
this.maxX = x; this.minX = x; this.minY = y;
} else {
this.maxX = this.trkWd - bar.offsetWidth - x;
this.minX = x; this.maxY = y; this.minY = y;
}
this.on_drag_start = this.on_drag = this.on_drag_end =
this.on_slide_start = this.on_slide = this.on_slide_end = function() {}
bar.onmousedown = dw_Slidebar.prepDrag;
// pass barId to obtain instance from dw_Slidebar.col
track.onmousedown = function(e) { dw_Slidebar.prepSlide(barId, e); }
this.bar = bar = null; track = null;
}
dw_Slidebar.col = {}; // hold instances for global access
dw_Slidebar.current = null; // hold current instance
dw_Slidebar.prototype.slideDur = 500;
// track received onmousedown event
dw_Slidebar.prepSlide = function(barId, e) {
var _this = dw_Slidebar.col[barId];
dw_Slidebar.current = _this;
var bar = _this.bar = document.getElementById(barId);
if ( _this.timer ) { clearInterval(_this.timer); _this.timer = 0; }
e = e? e: window.event;
e.offX = (typeof e.layerX != "undefined")? e.layerX: e.offsetX;
e.offY = (typeof e.layerY != "undefined")? e.layerY: e.offsetY;
_this.startX = parseInt(bar.style.left); _this.startY = parseInt(bar.style.top);
if (_this.axis == "v") {
_this.destX = _this.startX;
_this.destY = (e.offY < _this.startY)? e.offY: e.offY - bar.offsetHeight;
_this.destY = Math.min( Math.max(_this.destY, _this.minY), _this.maxY );
} else {
_this.destX = (e.offX < _this.startX)? e.offX: e.offX - bar.offsetWidth;
_this.destX = Math.min( Math.max(_this.destX, _this.minX), _this.maxX );
_this.destY = _this.startY;
}
_this.distX = _this.destX - _this.startX; _this.distY = _this.destY - _this.startY;
_this.per = Math.PI/(2 * _this.slideDur);
_this.slideStartTime = new Date().getTime();
_this.on_slide_start(_this.startX, _this.startY);
_this.timer = setInterval("dw_Slidebar.doSlide()", 10);
}
dw_Slidebar.doSlide = function() {
var _this = dw_Slidebar.current;
var elapsed = new Date().getTime() - _this.slideStartTime;
if (elapsed < _this.slideDur) {
var x = _this.startX + _this.distX * Math.sin(_this.per*elapsed);
var y = _this.startY + _this.distY * Math.sin(_this.per*elapsed);
_this.shiftTo(x,y);
_this.on_slide(x, y);
} else { // if time's up
clearInterval(_this.timer);
_this.shiftTo(_this.destX, _this.destY);
_this.on_slide(_this.destX, _this.destY);
_this.on_slide_end(_this.destX, _this.destY);
dw_Slidebar.current = null;
}
}
dw_Slidebar.prepDrag = function (e) {
var bar = this; // bar received onmousedown event
var barId = this.id; // id of element mousedown event assigned to
var _this = dw_Slidebar.col[barId]; // Slidebar instance
dw_Slidebar.current = _this;
_this.bar = bar;
e = dw_Event.DOMit(e);
if ( _this.timer ) { clearInterval(_this.timer); _this.timer = 0; }
_this.downX = e.clientX; _this.downY = e.clientY;
_this.startX = parseInt(bar.style.left);
_this.startY = parseInt(bar.style.top);
_this.on_drag_start(_this.startX, _this.startY);
dw_Event.add( document, "mousemove", dw_Slidebar.doDrag, true );
dw_Event.add( document, "mouseup", dw_Slidebar.endDrag, true );
e.stopPropagation(); e.preventDefault();
}
dw_Slidebar.doDrag = function(e) {
if ( !dw_Slidebar.current ) return; // avoid errors in ie if inappropriate selections
var _this = dw_Slidebar.current;
var bar = _this.bar;
e = dw_Event.DOMit(e);
var nx = _this.startX + e.clientX - _this.downX;
var ny = _this.startY + e.clientY - _this.downY;
nx = Math.min( Math.max( _this.minX, nx ), _this.maxX);
ny = Math.min( Math.max( _this.minY, ny ), _this.maxY);
_this.shiftTo(nx, ny);
_this.on_drag(nx, ny);
e.preventDefault(); e.stopPropagation();
}
dw_Slidebar.endDrag = function() {
if ( !dw_Slidebar.current ) return; // avoid errors in ie if inappropriate selections
var _this = dw_Slidebar.current;
var bar = _this.bar;
dw_Event.remove( document, "mousemove", dw_Slidebar.doDrag, true );
dw_Event.remove( document, "mouseup", dw_Slidebar.endDrag, true );
_this.on_drag_end( parseInt(bar.style.left), parseInt(bar.style.top) );
dw_Slidebar.current = null;
}
dw_Slidebar.prototype.shiftTo = function(x, y) {
if ( this.bar ) {
this.bar.style.left = x + "px";
this.bar.style.top = y + "px";
}
}
/////////////////////////////////////////////////////////////////////
// connect slidebar with scrollObj
dw_scrollObj.prototype.setUpScrollbar = function(barId, trkId, axis, offx, offy, bSize) {
var scrollbar = new dw_Slidebar(barId, trkId, axis, offx, offy);
if (axis == "v") {
this.vBarId = barId;
} else {
this.hBarId = barId;
}
scrollbar.wndoId = this.id;
scrollbar.bSizeDragBar = (bSize == false)? false: true;
if (scrollbar.bSizeDragBar) {
dw_Scrollbar_Co.setBarSize(this, scrollbar);
}
dw_Scrollbar_Co.setEvents(this, scrollbar);
}
// Coordinates slidebar and scrollObj
dw_Scrollbar_Co = {
// This function is called for each scrollbar attached to a scroll area (change from previous version)
setBarSize: function(scrollObj, barObj) {
var lyr = document.getElementById(scrollObj.lyrId);
var wn = document.getElementById(scrollObj.id);
if ( barObj.axis == 'v' ) {
var bar = document.getElementById(scrollObj.vBarId);
bar.style.height = (lyr.offsetHeight > wn.offsetHeight)?
barObj.trkHt / ( lyr.offsetHeight / wn.offsetHeight ) + "px":
barObj.trkHt - ( 2 * barObj.minY ) + "px";
barObj.maxY = barObj.trkHt - bar.offsetHeight - barObj.minY;
} else if ( barObj.axis == 'h' ) {
var bar = document.getElementById(scrollObj.hBarId);
bar.style.width = (scrollObj.wd > wn.offsetWidth)?
barObj.trkWd / ( scrollObj.wd / wn.offsetWidth ) + "px":
barObj.trkWd - ( 2 * barObj.minX ) + "px";
barObj.maxX = barObj.trkWd - bar.offsetWidth - barObj.minX;
}
},
// Find bars associated with this scrollObj. if they have bSizeDragBar set true reevaluate size and reset position to top
resetBars: function(scrollObj) {
var barObj, bar;
if (scrollObj.vBarId) {
barObj = dw_Slidebar.col[scrollObj.vBarId];
bar = document.getElementById(scrollObj.vBarId);
bar.style.left = barObj.minX + "px"; bar.style.top = barObj.minY + "px";
if (barObj.bSizeDragBar) {
dw_Scrollbar_Co.setBarSize(scrollObj, barObj);
}
}
if (scrollObj.hBarId) {
barObj = dw_Slidebar.col[scrollObj.hBarId];
bar = document.getElementById(scrollObj.hBarId);
bar.style.left = barObj.minX + "px"; bar.style.top = barObj.minY + "px";
if (barObj.bSizeDragBar) {
dw_Scrollbar_Co.setBarSize(scrollObj, barObj);
}
}
},
setEvents: function(scrollObj, barObj) {
// scrollObj
this.addEvent(scrollObj, 'on_load', function() { dw_Scrollbar_Co.resetBars(scrollObj); } );
this.addEvent(scrollObj, 'on_scroll_start', function() { dw_Scrollbar_Co.getBarRefs(scrollObj) } );
this.addEvent(scrollObj, 'on_glidescroll_start', function() { dw_Scrollbar_Co.getBarRefs(scrollObj) } );
this.addEvent(scrollObj, 'on_scroll', function(x,y) { dw_Scrollbar_Co.updateScrollbar(scrollObj, x, y) } );
this.addEvent(scrollObj, 'on_glidescroll', function(x,y) { dw_Scrollbar_Co.updateScrollbar(scrollObj, x, y) } );
this.addEvent(scrollObj, 'on_scroll_stop', function(x,y) { dw_Scrollbar_Co.updateScrollbar(scrollObj, x, y); } );
this.addEvent(scrollObj, 'on_glidescroll_stop', function(x,y) { dw_Scrollbar_Co.updateScrollbar(scrollObj, x, y); } );
this.addEvent(scrollObj, 'on_scroll_end', function(x,y) { dw_Scrollbar_Co.updateScrollbar(scrollObj, x, y); } );
this.addEvent(scrollObj, 'on_glidescroll_end', function(x,y) { dw_Scrollbar_Co.updateScrollbar(scrollObj, x, y); } );
// barObj
this.addEvent(barObj, 'on_slide_start', function() { dw_Scrollbar_Co.getWndoLyrRef(barObj) } );
this.addEvent(barObj, 'on_drag_start', function() { dw_Scrollbar_Co.getWndoLyrRef(barObj) } );
this.addEvent(barObj, 'on_slide', function(x,y) { dw_Scrollbar_Co.updateScrollPosition(barObj, x, y) } );
this.addEvent(barObj, 'on_drag', function(x,y) { dw_Scrollbar_Co.updateScrollPosition(barObj, x, y) } );
this.addEvent(barObj, 'on_slide_end', function(x,y) { dw_Scrollbar_Co.updateScrollPosition(barObj, x, y); } );
this.addEvent(barObj, 'on_drag_end', function(x,y) { dw_Scrollbar_Co.updateScrollPosition(barObj, x, y); } );
},
// Provide means to add functions to be invoked on pseudo events (on_load, on_scroll, etc)
// without overwriting any others that may already be set
// by Mark Wubben (see http://simonwillison.net/2004/May/26/addLoadEvent/)
addEvent: function(o, ev, fp) {
var oldEv = o[ev];
if ( typeof oldEv != 'function' ) {
//o[ev] = fp;
// almost all the functions (on_scroll, on_drag, etc.) pass x,y
o[ev] = function (x,y) { fp(x,y); }
} else {
o[ev] = function (x,y) {
oldEv(x,y );
fp(x,y);
}
}
},
// Keep position of dragBar in sync with position of layer when scrolled by other means (mouseover, etc.)
updateScrollbar: function(scrollObj, x, y) { //
var nx, ny;
if ( scrollObj.vBar && scrollObj.maxY ) {
var vBar = scrollObj.vBar;
ny = -( y * ( (vBar.maxY - vBar.minY) / scrollObj.maxY ) - vBar.minY );
ny = Math.min( Math.max(ny, vBar.minY), vBar.maxY);
if (vBar.bar) { // ref to bar el
nx = parseInt(vBar.bar.style.left);
vBar.shiftTo(nx, ny);
}
}
if ( scrollObj.hBar && scrollObj.maxX ) {
var hBar = scrollObj.hBar;
nx = -( x * ( (hBar.maxX - hBar.minX) / scrollObj.maxX ) - hBar.minX );
nx = Math.min( Math.max(nx, hBar.minX), hBar.maxX);
if (hBar.bar) {
ny = parseInt(hBar.bar.style.top);
hBar.shiftTo(nx, ny);
}
}
},
updateScrollPosition: function(barObj, x, y) { // on scrollbar movement
var nx, ny; var wndo = barObj.wndo;
if ( !wndo.lyr ) {
wndo.lyr = document.getElementById(wndo.lyrId);
}
if (barObj.axis == "v") {
nx = wndo.x; // floating point values for loaded layer's position held in shiftTo method
ny = -(y - barObj.minY) * ( wndo.maxY / (barObj.maxY - barObj.minY) ) || 0;
} else {
ny = wndo.y;
nx = -(x - barObj.minX) * ( wndo.maxX / (barObj.maxX - barObj.minX) ) || 0;
}
wndo.shiftTo(nx, ny);
},
// Scroll area may have both vertical and horizontal bars
getBarRefs: function(scrollObj) { // References to Slidebar instance and dom element
if ( scrollObj.vBarId ) {
scrollObj.vBar = dw_Slidebar.col[scrollObj.vBarId];
scrollObj.vBar.bar = document.getElementById(scrollObj.vBarId);
}
if ( scrollObj.hBarId ) {
scrollObj.hBar = dw_Slidebar.col[scrollObj.hBarId];
scrollObj.hBar.bar = document.getElementById(scrollObj.hBarId);
}
},
getWndoLyrRef: function(barObj) {
var wndo = barObj.wndo = dw_scrollObj.col[ barObj.wndoId ];
if ( wndo && !wndo.lyr ) {
wndo.lyr = document.getElementById(wndo.lyrId);
}
}
}