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BX.ui.scrollablePager = function(opts, nf){
this.parentConstruct(BX.ui.scrollablePager, opts);
BX.merge(this, {
opts: { // default options
areaHeight: 100, // the default height for top and bottom areas
eventTimeout: 100, // scroll event throttle timeout
pageRenderer: false,
setTopReachedOnPage: false,
setBottomReachedOnPage: false
},
vars: { // significant variables
pages: 0, // number of pages already loaded
boundsReached: {top: false, bottom: false}, // flags for indicate that bounds were reached already
prevScrollTop: false, // container.scrollTop got on the last scroll event
scrollEventLock: false, // when true, no scroll events handled
pageRange: false,
renderer: false
},
sys: {
code: 'pager'
}
});
//this.disableInFuncStack('init', BX.some.parent);
this.handleInitStack(nf, BX.ui.scrollablePager, opts);
};
BX.extend(BX.ui.scrollablePager, BX.ui.widget);
// the following functions can be overrided with inheritance
BX.merge(BX.ui.scrollablePager.prototype, {
// member of stack of initializers, must be defined even if do nothing
init: function(){
this.ctrls.pane = this.getControl('pane');
this.vars.scrollEventDispatcher = BX.throttle(this.checkScrollState, this.opts.eventTimeout, this);
if(this.opts.pageRenderer !== false)
this.vars.renderer = this.opts.pageRenderer;
else
this.vars.renderer = new BX.ui.scrollablePager.renderers.native();
this.vars.renderer.init({
scope: this.ctrls.scope,
pane: this.ctrls.pane,
parent: this
});
this.pushFuncStack('buildUpDOM', BX.ui.scrollablePager);
this.pushFuncStack('bindEvents', BX.ui.scrollablePager);
},
buildUpDOM: function(){
var sc = this.ctrls;
// add areas to the top and the bottom of the pane
var nodes = null;
if(typeof this.template('pager-area') != 'undefined')
nodes = this.createNodesByTemplate('pager-area', {}, true);
if(nodes == null || !BX.type.isDomNode(nodes[0]))
nodes = BX.create('div', {style: {'height': parseInt(this.opts.areaHeight)+'px'}});
else
nodes = nodes[0];
sc.areas = {
top: {node: nodes, height: 0},
bottom: {node: BX.clone(nodes), height: 0}
};
sc.pool = BX.create('div');
BX.append(sc.areas.top.node, sc.pane);
BX.append(sc.pool, sc.pane);
BX.append(sc.areas.bottom.node, sc.pane);
this.vars.renderer.update();
},
bindEvents: function(){
BX.addCustomEvent(this.vars.renderer, 'bx-ui-pagerenderer-scroll-changed', BX.proxy(function(){
this.dispatchScrollEvents();
}, this));
this.vars.renderer.bindScrollEvents();
},
////////// PUBLIC: free to use outside
////////// scrolling
scrollTo: function(height, ignoreEvents, sign){
var sv = this.vars;
if(ignoreEvents)
sv.scrollEventLock = true;
sv.renderer.setScrollTop(height, sign);
if(ignoreEvents)
sv.scrollEventLock = false;
return true;
},
scrollToNode: function(node){
// not implemented
},
// to dispatch scroll events manually
dispatchScrollEvents: function(){
if(this.vars.scrollEventLock)
return false;
this.vars.scrollEventDispatcher();
},
// to disable scroll events
lockScrollEvents: function(){
this.vars.scrollEventLock = true;
},
// to enable scroll events back
unLockScrollEvents: function(){
this.vars.scrollEventLock = false;
},
////////// paging
prependPage: function(data){
this.addPage(data, this.vars.pageRange == false ? 0 : this.vars.pageRange[0] - 1);
},
appendPage: function(data){
this.addPage(data, this.vars.pageRange == false ? 0 : this.vars.pageRange[1] + 1);
},
getFreePageNumber: function(bound){
if(this.vars.pageRange == false)
return 0;
if(bound == 0)
return this.vars.pageRange[0] - 1;
if(bound == 1)
return this.vars.pageRange[1] + 1;
return false;
},
getPageCount: function(){
return this.vars.pages;
},
// all content already shown at the top
setTopReached: function(way){
if(typeof way == 'undefined')
way = true;
this.manageBounds(way, true);
},
// all content already shown at the bottom
setBottomReached: function(way){
if(typeof way == 'undefined')
way = true;
this.manageBounds(way, false);
},
//////////cleaning
cleanUp: function(){
this.ctrls.pool.innerHTML = '';
this.setTopReached(false);
this.setBottomReached(false);
this.vars.pages = 0;
this.vars.pageRange = false;
this.vars.renderer.update();
},
// lately should appear as an item in remove stack
remove: function(){
// drop scope
if(BX.type.isDomNode(this.ctrls.scope))
this.ctrls.scope.innerHTML = '';
// ubind custom events
BX.unbindAll(this);
this.vars.renderer.remove();
},
////////// PRIVATE: forbidden to use outside (for compatibility reasons)
addPage: function(data, pageNum){
var sv = this.vars,
so = this.opts,
wrapper = this.getPageWrapper();
var st = this.ctrls.scope.scrollTop;
// check range integrity here
if(sv.pageRange != false){
if(pageNum != sv.pageRange[1] + 1 && pageNum != sv.pageRange[0] - 1)
throw new Error('Not allowed to break page range integrity');
}
// manage top bound here based on pageNum
if(so.setTopReachedOnPage !== false && pageNum == so.setTopReachedOnPage)
this.setTopReached();
if(so.setBottomReachedOnPage !== false && pageNum == so.setBottomReachedOnPage)
this.setBottomReached();
var actAppend = sv.pageRange == false || pageNum > sv.pageRange[1];
if(BX.type.isString(data))
wrapper.innerHTML = data;
else if(BX.type.isDomNode(data))
BX.append(data, wrapper);
else if('length' in data && data.length > 0){
for(var k in data)
{
if(data.hasOwnProperty(k))
if(BX.type.isDomNode(data[k]))
BX.append(data[k], wrapper);
}
}else
return false; // smth strange passed
var scrollBefore = this.vars.renderer.getScrollTop();
BX[actAppend ? 'append' : 'prepend'](wrapper, this.ctrls.pool);
if(!sv.boundsReached.top && sv.pages == 0){ // scroll to the first page in the pager
this.scrollTo(this.ctrls.areas.top.node.offsetHeight, true);
}else{
if(actAppend){ // on append
this.scrollTo(scrollBefore, true); // special for ie
}else // on prepend
this.scrollTo(wrapper.offsetHeight, true, +1);
}
this.vars.renderer.update();
// modify range
if(sv.pageRange == false){
sv.pageRange = [pageNum, pageNum];
}else{
if(actAppend)
sv.pageRange[1]++
else
sv.pageRange[0]--;
}
sv.pages++;
this.dispatchScrollEvents();
},
checkScrollState: function(){
var sv = this.vars;
var scopeScroll = sv.renderer.getScrollTop();
if(scopeScroll != 0 && sv.prevScrollTop == scopeScroll)
return false;
if(this.checkScrolledToTop(scopeScroll) && !sv.boundsReached.top)
this.fireEvent('scroll-to-top');
if(this.checkScrolledToBottom(scopeScroll) && !sv.boundsReached.bottom)
this.fireEvent('scroll-to-bottom');
sv.prevScrollTop = scopeScroll;
},
getPageWrapper: function(){
return BX.create('div', {props: {className: 'bx-ui-'+this.sys.code+'-page-wrapper'}});
},
topOn: function(){
this.manageBounds(false, true);
},
topOff: function(){
this.manageBounds(true, true);
},
// bounds are those two small areas at the top and the bottom
manageBounds: function(way, isTop){
way = !!way;
isTop = !!isTop;
var sv = this.vars,
sc = this.ctrls;
if(isTop){ // must affect scrollTop
var scroll = this.vars.renderer.getScrollTop();
var flip = (!sv.boundsReached.top && way)/*shown, need to be hidden*/ || (sv.boundsReached.top && !way)/*hidden, need to be shown*/;
if(flip){
var hidden = BX.style(sc.areas.top.node, 'display') == 'none'; // bad solution
var areaTopH = 0;
if(hidden){//sv.boundsReached.top){ // hidden
BX.show(sc.areas.top.node);
areaTopH = sc.areas.top.node.offsetHeight;
}else{ // shown
areaTopH = sc.areas.top.node.offsetHeight;
BX.hide(sc.areas.top.node);
}
this.scrollTo(areaTopH, true, way ? -1 : +1);
}
}else
BX[way ? 'hide' : 'show'](this.ctrls.areas.bottom.node);
this.vars.boundsReached[isTop ? 'top' : 'bottom'] = way;
this.vars.renderer.update();
},
checkFreeBottomSpace: function(){
return this.vars.renderer.getScrollTop() <= this.vars.renderer.getClientHeight();
},
checkScrolledToTop: function(scopeScroll){
return scopeScroll <= this.ctrls.areas.top.node.offsetHeight;
},
checkScrolledToBottom: function(scopeScroll){
var sc = this.ctrls;
return scopeScroll >= this.vars.renderer.getScrollHeight() - this.vars.renderer.getClientHeight() - sc.areas.bottom.node.offsetHeight;
}
});
// renderer based on native controls
// it takes div being scrolled as SCOPE
// and scrolled contens of SCOPE as PANE
BX.ui.scrollablePager.renderers = {
native: function(){
this.opts = {};
this.wheelLock = false;
this.init = function(opts){
this.opts = opts;
};
this.remove = function(){
BX.unbind(this.opts.scope, 'scroll', this.fireEvent);
BX.unbind(this.opts.scope, 'mousewheel', this.fireEvent);
BX.unbind(this.opts.pane, 'touchstart', this.fireEvent);
BX.unbind(window, 'resize', this.fireEvent);
this.opts = null;
};
this.update = function(){};
this.setScrollTop = function(height, sign){
if(typeof height == 'undefined')
return false;
height = parseInt(height);
if(height.toString() == 'NaN')
return false;
if(sign != 1 && sign != -1)
this.opts.scope.scrollTop = height;
else
this.opts.scope.scrollTop += sign*height;
};
this.getScrollTop = function(){
return this.opts.scope.scrollTop;
};
this.getScrollHeight = function(){
return this.opts.scope.scrollHeight;
};
this.getClientHeight = function(){
return this.opts.scope.clientHeight;
};
this.bindScrollEvents = function(){
var ctx = this;
BX.bind(this.opts.scope, 'mousewheel', function(e){
var wData = BX.getWheelData(e);
var jam = false;
if(wData > 0 && ctx.getScrollTop() == 0) // move up
jam = true;
if(wData < 0 && (ctx.getScrollTop() >= ctx.getScrollHeight() - ctx.getClientHeight())) // move down
jam = true;
if(jam){
BX.PreventDefault(e);
BX.eventCancelBubble(e);
return false;
}
});
this.fireEvent = function(e){
BX.onCustomEvent(ctx, 'bx-ui-pagerenderer-scroll-changed', []);
};
BX.bind(this.opts.scope, 'scroll', this.fireEvent);
BX.bind(this.opts.pane, 'touchstart', this.fireEvent);
BX.bind(window, 'resize', this.fireEvent);
};
return this;
}
}