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VirtualGrid.js
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VirtualGrid.js
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if(!dojo._hasResource["dojox.grid.VirtualGrid"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.grid.VirtualGrid"] = true;
dojo.provide("dojox.grid.VirtualGrid");
dojo.require("dojox.grid._grid.lib");
dojo.require("dojox.grid._grid.scroller");
dojo.require("dojox.grid._grid.view");
dojo.require("dojox.grid._grid.views");
dojo.require("dojox.grid._grid.layout");
dojo.require("dojox.grid._grid.rows");
dojo.require("dojox.grid._grid.focus");
dojo.require("dojox.grid._grid.selection");
dojo.require("dojox.grid._grid.edit");
dojo.require("dojox.grid._grid.rowbar");
dojo.require("dojox.grid._grid.publicEvents");
dojo.declare('dojox.VirtualGrid',
[ dijit._Widget, dijit._Templated ],
{
// summary:
// A grid widget with virtual scrolling, cell editing, complex rows,
// sorting, fixed columns, sizeable columns, etc.
//
// description:
// VirtualGrid provides the full set of grid features without any
// direct connection to a data store.
//
// The grid exposes a get function for the grid, or optionally
// individual columns, to populate cell contents.
//
// The grid is rendered based on its structure, an object describing
// column and cell layout.
//
// example:
// A quick sample:
//
// define a get function
// | function get(inRowIndex){ // called in cell context
// | return [this.index, inRowIndex].join(', ');
// | }
//
// define the grid structure:
// | var structure = [ // array of view objects
// | { cells: [// array of rows, a row is an array of cells
// | [
// | { name: "Alpha", width: 6 },
// | { name: "Beta" },
// | { name: "Gamma", get: get }]
// | ]}
// | ];
//
// | <div id="grid"
// | rowCount="100" get="get"
// | structure="structure"
// | dojoType="dojox.VirtualGrid"></div>
templateString: '<div class="dojoxGrid" hidefocus="hidefocus" role="wairole:grid"><div class="dojoxGrid-master-header" dojoAttachPoint="headerNode"></div><div class="dojoxGrid-master-view" dojoAttachPoint="viewsNode"></div><span dojoAttachPoint="lastFocusNode" tabindex="0"></span></div>',
// classTag: string
// css class applied to the grid's domNode
classTag: 'dojoxGrid',
get: function(inRowIndex){
/* summary: Default data getter.
description:
Provides data to display in a grid cell. Called in grid cell context.
So this.cell.index is the column index.
inRowIndex: integer
row for which to provide data
returns:
data to display for a given grid cell.
*/
},
// settings
// rowCount: int
// Number of rows to display.
rowCount: 5,
// keepRows: int
// Number of rows to keep in the rendering cache.
keepRows: 75,
// rowsPerPage: int
// Number of rows to render at a time.
rowsPerPage: 25,
// autoWidth: boolean
// If autoWidth is true, grid width is automatically set to fit the data.
autoWidth: false,
// autoHeight: boolean
// If autoHeight is true, grid height is automatically set to fit the data.
autoHeight: false,
// autoRender: boolean
// If autoRender is true, grid will render itself after initialization.
autoRender: true,
// defaultHeight: string
// default height of the grid, measured in any valid css unit.
defaultHeight: '15em',
// structure: object or string
// View layout defintion. Can be set to a layout object, or to the (string) name of a layout object.
structure: '',
// elasticView: int
// Override defaults and make the indexed grid view elastic, thus filling available horizontal space.
elasticView: -1,
// singleClickEdit: boolean
// Single-click starts editing. Default is double-click
singleClickEdit: false,
// private
sortInfo: 0,
themeable: true,
// initialization
buildRendering: function(){
this.inherited(arguments);
// reset get from blank function (needed for markup parsing) to null, if not changed
if(this.get == dojox.VirtualGrid.prototype.get){
this.get = null;
}
if(!this.domNode.getAttribute('tabIndex')){
this.domNode.tabIndex = "0";
}
this.createScroller();
this.createLayout();
this.createViews();
this.createManagers();
dojox.grid.initTextSizePoll();
this.connect(dojox.grid, "textSizeChanged", "textSizeChanged");
dojox.grid.funnelEvents(this.domNode, this, 'doKeyEvent', dojox.grid.keyEvents);
this.connect(this, "onShow", "renderOnIdle");
},
postCreate: function(){
// replace stock styleChanged with one that triggers an update
this.styleChanged = this._styleChanged;
this.setStructure(this.structure);
},
destroy: function(){
this.domNode.onReveal = null;
this.domNode.onSizeChange = null;
this.edit.destroy();
this.views.destroyViews();
this.inherited(arguments);
},
styleChanged: function(){
this.setStyledClass(this.domNode, '');
},
_styleChanged: function(){
this.styleChanged();
this.update();
},
textSizeChanged: function(){
setTimeout(dojo.hitch(this, "_textSizeChanged"), 1);
},
_textSizeChanged: function(){
if(this.domNode){
this.views.forEach(function(v){
v.content.update();
});
this.render();
}
},
sizeChange: function(){
dojox.grid.jobs.job(this.id + 'SizeChange', 50, dojo.hitch(this, "update"));
},
renderOnIdle: function() {
setTimeout(dojo.hitch(this, "render"), 1);
},
// managers
createManagers: function(){
// summary:
// create grid managers for various tasks including rows, focus, selection, editing
// row manager
this.rows = new dojox.grid.rows(this);
// focus manager
this.focus = new dojox.grid.focus(this);
// selection manager
this.selection = new dojox.grid.selection(this);
// edit manager
this.edit = new dojox.grid.edit(this);
},
// virtual scroller
createScroller: function(){
this.scroller = new dojox.grid.scroller.columns();
this.scroller.renderRow = dojo.hitch(this, "renderRow");
this.scroller.removeRow = dojo.hitch(this, "rowRemoved");
},
// layout
createLayout: function(){
this.layout = new dojox.grid.layout(this);
},
// views
createViews: function(){
this.views = new dojox.grid.views(this);
this.views.createView = dojo.hitch(this, "createView");
},
createView: function(inClass){
var c = eval(inClass);
var view = new c({ grid: this });
this.viewsNode.appendChild(view.domNode);
this.headerNode.appendChild(view.headerNode);
this.views.addView(view);
return view;
},
buildViews: function(){
for(var i=0, vs; (vs=this.layout.structure[i]); i++){
this.createView(vs.type || "dojox.GridView").setStructure(vs);
}
this.scroller.setContentNodes(this.views.getContentNodes());
},
setStructure: function(inStructure){
// summary:
// Install a new structure and rebuild the grid.
// inStructure: Object
// Structure object defines the grid layout and provides various
// options for grid views and columns
// description:
// A grid structure is an array of view objects. A view object can
// specify a view type (view class), width, noscroll (boolean flag
// for view scrolling), and cells. Cells is an array of objects
// corresponding to each grid column. The view cells object is an
// array of subrows comprising a single row. Each subrow is an
// array of column objects. A column object can have a name,
// width, value (default), get function to provide data, styles,
// and span attributes (rowSpan, colSpan).
this.views.destroyViews();
this.structure = inStructure;
if((this.structure)&&(dojo.isString(this.structure))){
this.structure=dojox.grid.getProp(this.structure);
}
if(!this.structure){
this.structure=window["layout"];
}
if(!this.structure){
return;
}
this.layout.setStructure(this.structure);
this._structureChanged();
},
_structureChanged: function() {
this.buildViews();
if(this.autoRender){
this.render();
}
},
// sizing
resize: function(){
// summary:
// Update the grid's rendering dimensions and resize it
// FIXME: If grid is not sized explicitly, sometimes bogus scrollbars
// can appear in our container, which may require an extra call to 'resize'
// to sort out.
// if we have set up everything except the DOM, we cannot resize
if(!this.domNode.parentNode){
return;
}
// useful measurement
var padBorder = dojo._getPadBorderExtents(this.domNode);
// grid height
if(this.autoHeight){
this.domNode.style.height = 'auto';
this.viewsNode.style.height = '';
}else if(this.flex > 0){
}else if(this.domNode.clientHeight <= padBorder.h){
if(this.domNode.parentNode == document.body){
this.domNode.style.height = this.defaultHeight;
}else{
this.fitTo = "parent";
}
}
if(this.fitTo == "parent"){
var h = dojo._getContentBox(this.domNode.parentNode).h;
dojo.marginBox(this.domNode, { h: Math.max(0, h) });
}
// header height
var t = this.views.measureHeader();
this.headerNode.style.height = t + 'px';
// content extent
var l = 1, h = (this.autoHeight ? -1 : Math.max(this.domNode.clientHeight - t, 0) || 0);
if(this.autoWidth){
// grid width set to total width
this.domNode.style.width = this.views.arrange(l, 0, 0, h) + 'px';
}else{
// views fit to our clientWidth
var w = this.domNode.clientWidth || (this.domNode.offsetWidth - padBorder.w);
this.views.arrange(l, 0, w, h);
}
// virtual scroller height
this.scroller.windowHeight = h;
// default row height (FIXME: use running average(?), remove magic #)
this.scroller.defaultRowHeight = this.rows.getDefaultHeightPx() + 1;
this.postresize();
},
resizeHeight: function(){
var t = this.views.measureHeader();
this.headerNode.style.height = t + 'px';
// content extent
var h = (this.autoHeight ? -1 : Math.max(this.domNode.clientHeight - t, 0) || 0);
//this.views.arrange(0, 0, 0, h);
this.views.onEach('setSize', [0, h]);
this.views.onEach('resizeHeight');
this.scroller.windowHeight = h;
},
// render
render: function(){
// summary:
// Render the grid, headers, and views. Edit and scrolling states are reset. To retain edit and
// scrolling states, see Update.
if(!this.domNode){return;}
//
this.update = this.defaultUpdate;
this.scroller.init(this.rowCount, this.keepRows, this.rowsPerPage);
this.prerender();
this.setScrollTop(0);
this.postrender();
},
prerender: function(){
this.views.render();
this.resize();
},
postrender: function(){
this.postresize();
this.focus.initFocusView();
// make rows unselectable
dojo.setSelectable(this.domNode, false);
},
postresize: function(){
// views are position absolute, so they do not inflate the parent
if(this.autoHeight){
this.viewsNode.style.height = this.views.measureContent() + 'px';
}
},
// private, used internally to render rows
renderRow: function(inRowIndex, inNodes){
this.views.renderRow(inRowIndex, inNodes);
},
// private, used internally to remove rows
rowRemoved: function(inRowIndex){
this.views.rowRemoved(inRowIndex);
},
invalidated: null,
updating: false,
beginUpdate: function(){
// summary:
// Use to make multiple changes to rows while queueing row updating.
// NOTE: not currently supporting nested begin/endUpdate calls
this.invalidated = [];
this.updating = true;
},
endUpdate: function(){
// summary:
// Use after calling beginUpdate to render any changes made to rows.
this.updating = false;
var i = this.invalidated;
if(i.all){
this.update();
}else if(i.rowCount != undefined){
this.updateRowCount(i.rowCount);
}else{
for(r in i){
this.updateRow(Number(r));
}
}
this.invalidated = null;
},
// update
defaultUpdate: function(){
// note: initial update calls render and subsequently this function.
if(this.updating){
this.invalidated.all = true;
return;
}
//this.edit.saveState(inRowIndex);
this.prerender();
this.scroller.invalidateNodes();
this.setScrollTop(this.scrollTop);
this.postrender();
//this.edit.restoreState(inRowIndex);
},
update: function(){
// summary:
// Update the grid, retaining edit and scrolling states.
this.render();
},
updateRow: function(inRowIndex){
// summary:
// Render a single row.
// inRowIndex: int
// index of the row to render
inRowIndex = Number(inRowIndex);
if(this.updating){
this.invalidated[inRowIndex]=true;
return;
}
this.views.updateRow(inRowIndex, this.rows.getHeight(inRowIndex));
this.scroller.rowHeightChanged(inRowIndex);
},
updateRowCount: function(inRowCount){
//summary:
// Change the number of rows.
// inRowCount: int
// Number of rows in the grid.
if(this.updating){
this.invalidated.rowCount = inRowCount;
return;
}
this.rowCount = inRowCount;
this.scroller.updateRowCount(inRowCount);
this.setScrollTop(this.scrollTop);
this.resize();
},
updateRowStyles: function(inRowIndex){
// summary:
// Update the styles for a row after it's state has changed.
this.views.updateRowStyles(inRowIndex);
},
rowHeightChanged: function(inRowIndex){
// summary:
// Update grid when the height of a row has changed. Row height is handled automatically as rows
// are rendered. Use this function only to update a row's height outside the normal rendering process.
// inRowIndex: int
// index of the row that has changed height
this.views.renormalizeRow(inRowIndex);
this.scroller.rowHeightChanged(inRowIndex);
},
// fastScroll: boolean
// flag modifies vertical scrolling behavior. Defaults to true but set to false for slower
// scroll performance but more immediate scrolling feedback
fastScroll: true,
delayScroll: false,
// scrollRedrawThreshold: int
// pixel distance a user must scroll vertically to trigger grid scrolling.
scrollRedrawThreshold: (dojo.isIE ? 100 : 50),
// scroll methods
scrollTo: function(inTop){
// summary:
// Vertically scroll the grid to a given pixel position
// inTop: int
// vertical position of the grid in pixels
if(!this.fastScroll){
this.setScrollTop(inTop);
return;
}
var delta = Math.abs(this.lastScrollTop - inTop);
this.lastScrollTop = inTop;
if(delta > this.scrollRedrawThreshold || this.delayScroll){
this.delayScroll = true;
this.scrollTop = inTop;
this.views.setScrollTop(inTop);
dojox.grid.jobs.job('dojoxGrid-scroll', 200, dojo.hitch(this, "finishScrollJob"));
}else{
this.setScrollTop(inTop);
}
},
finishScrollJob: function(){
this.delayScroll = false;
this.setScrollTop(this.scrollTop);
},
setScrollTop: function(inTop){
this.scrollTop = this.views.setScrollTop(inTop);
this.scroller.scroll(this.scrollTop);
},
scrollToRow: function(inRowIndex){
// summary:
// Scroll the grid to a specific row.
// inRowIndex: int
// grid row index
this.setScrollTop(this.scroller.findScrollTop(inRowIndex) + 1);
},
// styling (private, used internally to style individual parts of a row)
styleRowNode: function(inRowIndex, inRowNode){
if(inRowNode){
this.rows.styleRowNode(inRowIndex, inRowNode);
}
},
// cells
getCell: function(inIndex){
// summary:
// retrieves the cell object for a given grid column.
// inIndex: int
// grid column index of cell to retrieve
// returns:
// a grid cell
return this.layout.cells[inIndex];
},
setCellWidth: function(inIndex, inUnitWidth) {
this.getCell(inIndex).unitWidth = inUnitWidth;
},
getCellName: function(inCell){
return "Cell " + inCell.index;
},
// sorting
canSort: function(inSortInfo){
// summary:
// determines if the grid can be sorted
// inSortInfo: int
// Sort information, 1-based index of column on which to sort, positive for an ascending sort
// and negative for a descending sort
// returns:
// true if grid can be sorted on the given column in the given direction
},
sort: function(){
},
getSortAsc: function(inSortInfo){
// summary:
// returns true if grid is sorted in an ascending direction.
inSortInfo = inSortInfo == undefined ? this.sortInfo : inSortInfo;
return Boolean(inSortInfo > 0);
},
getSortIndex: function(inSortInfo){
// summary:
// returns the index of the column on which the grid is sorted
inSortInfo = inSortInfo == undefined ? this.sortInfo : inSortInfo;
return Math.abs(inSortInfo) - 1;
},
setSortIndex: function(inIndex, inAsc){
// summary:
// Sort the grid on a column in a specified direction
// inIndex: int
// Column index on which to sort.
// inAsc: boolean
// If true, sort the grid in ascending order, otherwise in descending order
var si = inIndex +1;
if(inAsc != undefined){
si *= (inAsc ? 1 : -1);
} else if(this.getSortIndex() == inIndex){
si = -this.sortInfo;
}
this.setSortInfo(si);
},
setSortInfo: function(inSortInfo){
if(this.canSort(inSortInfo)){
this.sortInfo = inSortInfo;
this.sort();
this.update();
}
},
// DOM event handler
doKeyEvent: function(e){
e.dispatch = 'do' + e.type;
this.onKeyEvent(e);
},
// event dispatch
//: protected
_dispatch: function(m, e){
if(m in this){
return this[m](e);
}
},
dispatchKeyEvent: function(e){
this._dispatch(e.dispatch, e);
},
dispatchContentEvent: function(e){
this.edit.dispatchEvent(e) || e.sourceView.dispatchContentEvent(e) || this._dispatch(e.dispatch, e);
},
dispatchHeaderEvent: function(e){
e.sourceView.dispatchHeaderEvent(e) || this._dispatch('doheader' + e.type, e);
},
dokeydown: function(e){
this.onKeyDown(e);
},
doclick: function(e){
if(e.cellNode){
this.onCellClick(e);
}else{
this.onRowClick(e);
}
},
dodblclick: function(e){
if(e.cellNode){
this.onCellDblClick(e);
}else{
this.onRowDblClick(e);
}
},
docontextmenu: function(e){
if(e.cellNode){
this.onCellContextMenu(e);
}else{
this.onRowContextMenu(e);
}
},
doheaderclick: function(e){
if(e.cellNode){
this.onHeaderCellClick(e);
}else{
this.onHeaderClick(e);
}
},
doheaderdblclick: function(e){
if(e.cellNode){
this.onHeaderCellDblClick(e);
}else{
this.onHeaderDblClick(e);
}
},
doheadercontextmenu: function(e){
if(e.cellNode){
this.onHeaderCellContextMenu(e);
}else{
this.onHeaderContextMenu(e);
}
},
// override to modify editing process
doStartEdit: function(inCell, inRowIndex){
this.onStartEdit(inCell, inRowIndex);
},
doApplyCellEdit: function(inValue, inRowIndex, inFieldIndex){
this.onApplyCellEdit(inValue, inRowIndex, inFieldIndex);
},
doCancelEdit: function(inRowIndex){
this.onCancelEdit(inRowIndex);
},
doApplyEdit: function(inRowIndex){
this.onApplyEdit(inRowIndex);
},
// row editing
addRow: function(){
// summary:
// add a row to the grid.
this.updateRowCount(this.rowCount+1);
},
removeSelectedRows: function(){
// summary:
// remove the selected rows from the grid.
this.updateRowCount(Math.max(0, this.rowCount - this.selection.getSelected().length));
this.selection.clear();
}
});
dojo.mixin(dojox.VirtualGrid.prototype, dojox.grid.publicEvents);
}

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