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/**
* @author Ed Spencer (http://sencha.com)
* Transition plugin for DataViews
*/
Ext.define('Ext.ux.DataView.Animated', {
/**
* @property defaults
* @type Object
* Default configuration options for all DataViewTransition instances
*/
defaults: {
duration : 750,
idProperty: 'id'
},
/**
* Creates the plugin instance, applies defaults
* @constructor
* @param {Object} config Optional config object
*/
constructor: function(config) {
Ext.apply(this, config || {}, this.defaults);
},
/**
* Initializes the transition plugin. Overrides the dataview's default refresh function
* @param {Ext.view.View} dataview The dataview
*/
init: function(dataview) {
/**
* @property dataview
* @type Ext.view.View
* Reference to the DataView this instance is bound to
*/
this.dataview = dataview;
var store = dataview.store;
dataview.blockRefresh = true;
dataview.updateIndexes = Ext.Function.createSequence(dataview.updateIndexes, function() {
this.getTargetEl().select(this.itemSelector).each(function(element, composite, index) {
element.id = element.dom.id = Ext.util.Format.format("{0}-{1}", dataview.id, store.getAt(index).internalId);
}, this);
}, dataview);
/**
* @property dataviewID
* @type String
* The string ID of the DataView component. This is used internally when animating child objects
*/
this.dataviewID = dataview.id;
/**
* @property cachedStoreData
* @type Object
* A cache of existing store data, keyed by id. This is used to determine
* whether any items were added or removed from the store on data change
*/
this.cachedStoreData = {};
//catch the store data with the snapshot immediately
this.cacheStoreData(store.data || store.snapshot);
dataview.on('resize', function() {
var store = dataview.store;
if (store.getCount() > 0) {
// reDraw.call(this, store);
}
}, this);
dataview.store.on('datachanged', reDraw, this);
function reDraw(store) {
var parentEl = dataview.getTargetEl(),
calcItem = store.getAt(0),
added = this.getAdded(store),
removed = this.getRemoved(store),
previous = this.getRemaining(store);
// Not yet rendered
if (!parentEl) {
return;
}
//make sure the correct styles are applied to the parent element
if (Ext.isIEQuirks) {
parentEl.applyStyles({
zoom: 1,
display : 'block',
position: 'relative'
});
}
//hide old items
Ext.each(removed, function(item) {
var id = this.dataviewID + '-' + item.internalId;
Ext.fly(id).animate({
remove : false,
duration: duration,
opacity : 0,
useDisplay: true,
callback: function() {
Ext.fly(id).setDisplayed(false);
}
});
}, this);
//store is empty
if (calcItem == undefined) {
this.cacheStoreData(store);
return;
}
this.cacheStoreData(store);
var el = Ext.get(this.dataviewID + "-" + calcItem.internalId);
//if there is nothing rendered, force a refresh and return. This happens when loading asynchronously (was not
//covered correctly in previous versions, which only accepted local data)
if (!el) {
dataview.refresh();
return true;
}
//calculate the number of rows and columns we have
var itemWidth = el.getMargin('lr') + el.getWidth(),
itemHeight = el.getMargin('bt') + el.getHeight(),
dvWidth = parentEl.dom.clientWidth,
columns = Math.floor(dvWidth / itemWidth),
rtl = this.dataview.getHierarchyState().rtl,
styleSide = rtl ? 'right' : 'left',
newStyle;
//stores the current top and left values for each element (discovered below)
var oldPositions = {},
newPositions = {},
elCache = {};
//find current positions of each element and save a reference in the elCache
Ext.iterate(previous, function(id, item) {
var id = item.internalId,
el = elCache[id] = Ext.get(this.dataviewID + '-' + id);
oldPositions[id] = {
top : el.getY() - parentEl.getY() - el.getMargin('t') - parentEl.getPadding('t')
};
oldPositions[id][styleSide] = this.getItemX(el);
}, this);
//set absolute positioning on all DataView items. We need to set position, left and
//top at the same time to avoid any flickering
Ext.iterate(previous, function(id, item) {
var oldPos = oldPositions[id],
el = elCache[id];
if (el.getStyle('position') != 'absolute') {
newStyle = {
position: 'absolute',
top : oldPos.top + "px"
};
newStyle[styleSide] = oldPos[styleSide] + "px";
elCache[id].applyStyles(newStyle);
}
});
//get new positions
var index = 0;
Ext.iterate(store.data.items, function(item) {
var id = item.internalId,
column = index % columns,
row = Math.floor(index / columns),
top = row * itemHeight,
left = column * itemWidth;
newPositions[id] = {
top : top
};
newPositions[id][styleSide] = left;
index ++;
}, this);
//do the movements
var startTime = new Date(),
duration = this.duration,
dataviewID = this.dataviewID;
var doAnimate = function() {
var elapsed = new Date() - startTime,
fraction = elapsed / duration,
id;
if (fraction >= 1) {
for (id in newPositions) {
newStyle = {
top : newPositions[id].top + "px"
};
newStyle[styleSide] = newPositions[id][styleSide] + "px";
Ext.fly(dataviewID + '-' + id).applyStyles(newStyle);
}
Ext.TaskManager.stop(task);
} else {
//move each item
for (id in newPositions) {
if (!previous[id]) {
continue;
}
var oldPos = oldPositions[id],
newPos = newPositions[id],
oldTop = oldPos.top,
newTop = newPos.top,
oldLeft = oldPos[styleSide],
newLeft = newPos[styleSide],
diffTop = fraction * Math.abs(oldTop - newTop),
diffLeft= fraction * Math.abs(oldLeft - newLeft),
midTop = oldTop > newTop ? oldTop - diffTop : oldTop + diffTop,
midLeft = oldLeft > newLeft ? oldLeft - diffLeft : oldLeft + diffLeft;
newStyle = {
top : midTop + "px"
};
newStyle[styleSide] = midLeft + "px";
Ext.fly(dataviewID + '-' + id).applyStyles(newStyle).setDisplayed(true);
}
}
};
var task = {
run : doAnimate,
interval: 20,
scope : this
};
Ext.TaskManager.start(task);
//show new items
Ext.iterate(added, function(id, item) {
newStyle = {
top : newPositions[item.internalId].top + "px"
};
newStyle[styleSide] = newPositions[item.internalId][styleSide] + "px";
Ext.fly(this.dataviewID + '-' + item.internalId).applyStyles(newStyle).setDisplayed(true);
Ext.fly(this.dataviewID + '-' + item.internalId).animate({
remove : false,
duration: duration,
opacity : 1
});
}, this);
this.cacheStoreData(store);
}
},
getItemX: function(el) {
var rtl = this.dataview.getHierarchyState().rtl,
parentEl = el.up('');
if (rtl) {
return parentEl.getViewRegion().right - el.getRegion().right + el.getMargin('r');
} else {
return el.getX() - parentEl.getX() - el.getMargin('l') - parentEl.getPadding('l');
}
},
/**
* Caches the records from a store locally for comparison later
* @param {Ext.data.Store} store The store to cache data from
*/
cacheStoreData: function(store) {
this.cachedStoreData = {};
store.each(function(record) {
this.cachedStoreData[record.internalId] = record;
}, this);
},
/**
* Returns all records that were already in the DataView
* @return {Object} All existing records
*/
getExisting: function() {
return this.cachedStoreData;
},
/**
* Returns the total number of items that are currently visible in the DataView
* @return {Number} The number of existing items
*/
getExistingCount: function() {
var count = 0,
items = this.getExisting();
for (var k in items) {
count++;
}
return count;
},
/**
* Returns all records in the given store that were not already present
* @param {Ext.data.Store} store The updated store instance
* @return {Object} Object of records not already present in the dataview in format {id: record}
*/
getAdded: function(store) {
var added = {};
store.each(function(record) {
if (this.cachedStoreData[record.internalId] == undefined) {
added[record.internalId] = record;
}
}, this);
return added;
},
/**
* Returns all records that are present in the DataView but not the new store
* @param {Ext.data.Store} store The updated store instance
* @return {Array} Array of records that used to be present
*/
getRemoved: function(store) {
var removed = [],
id;
for (id in this.cachedStoreData) {
if (store.findBy(function(record) {return record.internalId == id;}) == -1) {
removed.push(this.cachedStoreData[id]);
}
}
return removed;
},
/**
* Returns all records that are already present and are still present in the new store
* @param {Ext.data.Store} store The updated store instance
* @return {Object} Object of records that are still present from last time in format {id: record}
*/
getRemaining: function(store) {
var remaining = {};
store.each(function(record) {
if (this.cachedStoreData[record.internalId] != undefined) {
remaining[record.internalId] = record;
}
}, this);
return remaining;
}
});
