define([
	"dojo/keys",
	"dojo/dom-class",
	"dojo/_base/declare",
	"dojo/_base/event",
	"dojo/_base/sniff"
], function(keys, domClass, declare, event, has){

return declare("dojox.grid._Events", null, {
	// summary:
	//		_Grid mixin that provides default implementations for grid events.
	// description:
	//		Default synthetic events dispatched for _Grid. dojo.connect to events to
	//		retain default implementation or override them for custom handling.
	
	// cellOverClass: String
	//		css class to apply to grid cells over which the cursor is placed.
	cellOverClass: "dojoxGridCellOver",
	
	onKeyEvent: function(e){
		// summary:
		//		top level handler for Key Events
		this.dispatchKeyEvent(e);
	},

	onContentEvent: function(e){
		// summary:
		//		Top level handler for Content events
		this.dispatchContentEvent(e);
	},

	onHeaderEvent: function(e){
		// summary:
		//		Top level handler for header events
		this.dispatchHeaderEvent(e);
	},

	onStyleRow: function(inRow){
		// summary:
		//		Perform row styling on a given row. Called whenever row styling is updated.
		// inRow: Object
		//		Object containing row state information: selected, true if the row is selcted; over:
		//		true of the mouse is over the row; odd: true if the row is odd. Use customClasses and
		//		customStyles to control row css classes and styles; both properties are strings.
		// example:
		// |	onStyleRow({ selected: true, over:true, odd:false })
		var i = inRow;
		i.customClasses += (i.odd?" dojoxGridRowOdd":"") + (i.selected?" dojoxGridRowSelected":"") + (i.over?" dojoxGridRowOver":"");
		this.focus.styleRow(inRow);
		this.edit.styleRow(inRow);
	},
	
	onKeyDown: function(e){
		// summary:
		//		Grid key event handler. By default enter begins editing and applies edits, escape cancels an edit,
		//		tab, shift-tab, and arrow keys move grid cell focus.
		if(e.altKey || e.metaKey){
			return;
		}
		var colIdx;
		switch(e.keyCode){
			case keys.ESCAPE:
				this.edit.cancel();
				break;
			case keys.ENTER:
				if(!this.edit.isEditing()){
					colIdx = this.focus.getHeaderIndex();
					if(colIdx >= 0) {
						this.setSortIndex(colIdx);
						break;
					}else {
						this.selection.clickSelect(this.focus.rowIndex, dojo.isCopyKey(e), e.shiftKey);
					}
					event.stop(e);
				}
				if(!e.shiftKey){
					var isEditing = this.edit.isEditing();
					this.edit.apply();
					if(!isEditing){
						this.edit.setEditCell(this.focus.cell, this.focus.rowIndex);
					}
				}
				if (!this.edit.isEditing()){
					var curView = this.focus.focusView || this.views.views[0];  //if no focusView than only one view
					curView.content.decorateEvent(e);
					this.onRowClick(e);
					event.stop(e);
				}
				break;
			case keys.SPACE:
				if(!this.edit.isEditing()){
					colIdx = this.focus.getHeaderIndex();
					if(colIdx >= 0) {
						this.setSortIndex(colIdx);
						break;
					}else {
						this.selection.clickSelect(this.focus.rowIndex, dojo.isCopyKey(e), e.shiftKey);
					}
					event.stop(e);
				}
				break;
			case keys.TAB:
				this.focus[e.shiftKey ? 'previousKey' : 'nextKey'](e);
				break;
			case keys.LEFT_ARROW:
			case keys.RIGHT_ARROW:
				if(!this.edit.isEditing()){
					var keyCode = e.keyCode;  // IE seems to lose after stopEvent when modifier keys
					event.stop(e);
					colIdx = this.focus.getHeaderIndex();
					if (colIdx >= 0 && (e.shiftKey && e.ctrlKey)){
						this.focus.colSizeAdjust(e, colIdx, (keyCode == keys.LEFT_ARROW ? -1 : 1)*5);
					}
					else{
						var offset = (keyCode == keys.LEFT_ARROW) ? 1 : -1;
						if(this.isLeftToRight()){ offset *= -1; }
						this.focus.move(0, offset);
					}
				}
				break;
			case keys.UP_ARROW:
				if(!this.edit.isEditing() && this.focus.rowIndex !== 0){
					event.stop(e);
					this.focus.move(-1, 0);
				}
				break;
			case keys.DOWN_ARROW:
				if(!this.edit.isEditing() && this.focus.rowIndex+1 != this.rowCount){
					event.stop(e);
					this.focus.move(1, 0);
				}
				break;
			case keys.PAGE_UP:
				if(!this.edit.isEditing() && this.focus.rowIndex !== 0){
					event.stop(e);
					if(this.focus.rowIndex != this.scroller.firstVisibleRow+1){
						this.focus.move(this.scroller.firstVisibleRow-this.focus.rowIndex, 0);
					}else{
						this.setScrollTop(this.scroller.findScrollTop(this.focus.rowIndex-1));
						this.focus.move(this.scroller.firstVisibleRow-this.scroller.lastVisibleRow+1, 0);
					}
				}
				break;
			case keys.PAGE_DOWN:
				if(!this.edit.isEditing() && this.focus.rowIndex+1 != this.rowCount){
					event.stop(e);
					if(this.focus.rowIndex != this.scroller.lastVisibleRow-1){
						this.focus.move(this.scroller.lastVisibleRow-this.focus.rowIndex-1, 0);
					}else{
						this.setScrollTop(this.scroller.findScrollTop(this.focus.rowIndex+1));
						this.focus.move(this.scroller.lastVisibleRow-this.scroller.firstVisibleRow-1, 0);
					}
				}
				break;
			default:
				break;
		}
	},
	
	onMouseOver: function(e){
		// summary:
		//		Event fired when mouse is over the grid.
		// e: Event
		//		Decorated event object contains reference to grid, cell, and rowIndex
		e.rowIndex == -1 ? this.onHeaderCellMouseOver(e) : this.onCellMouseOver(e);
	},
	
	onMouseOut: function(e){
		// summary:
		//		Event fired when mouse moves out of the grid.
		// e: Event
		//		Decorated event object that contains reference to grid, cell, and rowIndex
		e.rowIndex == -1 ? this.onHeaderCellMouseOut(e) : this.onCellMouseOut(e);
	},
	
	onMouseDown: function(e){
		// summary:
		//		Event fired when mouse is down inside grid.
		// e: Event
		//		Decorated event object that contains reference to grid, cell, and rowIndex
		e.rowIndex == -1 ? this.onHeaderCellMouseDown(e) : this.onCellMouseDown(e);
	},
	
	onMouseOverRow: function(e){
		// summary:
		//		Event fired when mouse is over any row (data or header).
		// e: Event
		//		Decorated event object contains reference to grid, cell, and rowIndex
		if(!this.rows.isOver(e.rowIndex)){
			this.rows.setOverRow(e.rowIndex);
			e.rowIndex == -1 ? this.onHeaderMouseOver(e) : this.onRowMouseOver(e);
		}
	},
	onMouseOutRow: function(e){
		// summary:
		//		Event fired when mouse moves out of any row (data or header).
		// e: Event
		//		Decorated event object contains reference to grid, cell, and rowIndex
		if(this.rows.isOver(-1)){
			this.onHeaderMouseOut(e);
		}else if(!this.rows.isOver(-2)){
			this.rows.setOverRow(-2);
			this.onRowMouseOut(e);
		}
	},
	
	onMouseDownRow: function(e){
		// summary:
		//		Event fired when mouse is down inside grid row
		// e: Event
		//		Decorated event object that contains reference to grid, cell, and rowIndex
		if(e.rowIndex != -1)
			this.onRowMouseDown(e);
	},

	// cell events
	onCellMouseOver: function(e){
		// summary:
		//		Event fired when mouse is over a cell.
		// e: Event
		//		Decorated event object contains reference to grid, cell, and rowIndex
		if(e.cellNode){
			domClass.add(e.cellNode, this.cellOverClass);
		}
	},
	
	onCellMouseOut: function(e){
		// summary:
		//		Event fired when mouse moves out of a cell.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		if(e.cellNode){
			domClass.remove(e.cellNode, this.cellOverClass);
		}
	},
	
	onCellMouseDown: function(e){
		// summary:
		//		Event fired when mouse is down in a header cell.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
	},

	onCellClick: function(e){
		// summary:
		//		Event fired when a cell is clicked.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		this._click[0] = this._click[1];
		this._click[1] = e;
		if(!this.edit.isEditCell(e.rowIndex, e.cellIndex)){
			this.focus.setFocusCell(e.cell, e.rowIndex);
		}
		// in some cases click[0] is null which causes false doubeClicks. Fixes #100703
		if(this._click.length > 1 && this._click[0] == null){
			this._click.shift();
		}
		this.onRowClick(e);
	},

	onCellDblClick: function(e){
		// summary:
		//		Event fired when a cell is double-clicked.
		// e: Event
		//		Decorated event object contains reference to grid, cell, and rowIndex
		var event;
		if(this._click.length > 1 && has('ie')){
			event = this._click[1];
		}else if(this._click.length > 1 && this._click[0].rowIndex != this._click[1].rowIndex){
			event = this._click[0];
		}else{
			event = e;
		}
		this.focus.setFocusCell(event.cell, event.rowIndex);
		this.edit.setEditCell(event.cell, event.rowIndex);
		this.onRowDblClick(e);
	},

	onCellContextMenu: function(e){
		// summary:
		//		Event fired when a cell context menu is accessed via mouse right click.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		this.onRowContextMenu(e);
	},

	onCellFocus: function(inCell, inRowIndex){
		// summary:
		//		Event fired when a cell receives focus.
		// inCell: Object
		//		Cell object containing properties of the grid column.
		// inRowIndex: Integer
		//		Index of the grid row
		this.edit.cellFocus(inCell, inRowIndex);
	},

	// row events
	onRowClick: function(e){
		// summary:
		//		Event fired when a row is clicked.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		this.edit.rowClick(e);
		this.selection.clickSelectEvent(e);
	},

	onRowDblClick: function(e){
		// summary:
		//		Event fired when a row is double clicked.
		// e: Event
		//		decorated event object which contains reference to grid, cell, and rowIndex
	},

	onRowMouseOver: function(e){
		// summary:
		//		Event fired when mouse moves over a data row.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
	},

	onRowMouseOut: function(e){
		// summary:
		//		Event fired when mouse moves out of a data row.
		// e: Event
		//		Decorated event object contains reference to grid, cell, and rowIndex
	},
	
	onRowMouseDown: function(e){
		// summary:
		//		Event fired when mouse is down in a row.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
	},

	onRowContextMenu: function(e){
		// summary:
		//		Event fired when a row context menu is accessed via mouse right click.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		event.stop(e);
	},

	// header events
	onHeaderMouseOver: function(e){
		// summary:
		//		Event fired when mouse moves over the grid header.
		// e: Event
		//		Decorated event object contains reference to grid, cell, and rowIndex
	},

	onHeaderMouseOut: function(e){
		// summary:
		//		Event fired when mouse moves out of the grid header.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
	},

	onHeaderCellMouseOver: function(e){
		// summary:
		//		Event fired when mouse moves over a header cell.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		if(e.cellNode){
			domClass.add(e.cellNode, this.cellOverClass);
		}
	},

	onHeaderCellMouseOut: function(e){
		// summary:
		//		Event fired when mouse moves out of a header cell.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		if(e.cellNode){
			domClass.remove(e.cellNode, this.cellOverClass);
		}
	},
	
	onHeaderCellMouseDown: function(e) {
		// summary:
		//		Event fired when mouse is down in a header cell.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
	},

	onHeaderClick: function(e){
		// summary:
		//		Event fired when the grid header is clicked.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
	},

	onHeaderCellClick: function(e){
		// summary:
		//		Event fired when a header cell is clicked.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		this.setSortIndex(e.cell.index);
		this.onHeaderClick(e);
	},

	onHeaderDblClick: function(e){
		// summary:
		//		Event fired when the grid header is double clicked.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
	},

	onHeaderCellDblClick: function(e){
		// summary:
		//		Event fired when a header cell is double clicked.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		this.onHeaderDblClick(e);
	},

	onHeaderCellContextMenu: function(e){
		// summary:
		//		Event fired when a header cell context menu is accessed via mouse right click.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		this.onHeaderContextMenu(e);
	},

	onHeaderContextMenu: function(e){
		// summary:
		//		Event fired when the grid header context menu is accessed via mouse right click.
		// e: Event
		//		Decorated event object which contains reference to grid, cell, and rowIndex
		if(!this.headerMenu){
			event.stop(e);
		}
	},

	// editing
	onStartEdit: function(inCell, inRowIndex){
		// summary:
		//		Event fired when editing is started for a given grid cell
		// inCell: Object
		//		Cell object containing properties of the grid column.
		// inRowIndex: Integer
		//		Index of the grid row
	},

	onApplyCellEdit: function(inValue, inRowIndex, inFieldIndex){
		// summary:
		//		Event fired when editing is applied for a given grid cell
		// inValue: String
		//		Value from cell editor
		// inRowIndex: Integer
		//		Index of the grid row
		// inFieldIndex: Integer
		//		Index in the grid's data store
	},

	onCancelEdit: function(inRowIndex){
		// summary:
		//		Event fired when editing is cancelled for a given grid cell
		// inRowIndex: Integer
		//		Index of the grid row
	},

	onApplyEdit: function(inRowIndex){
		// summary:
		//		Event fired when editing is applied for a given grid row
		// inRowIndex: Integer
		//		Index of the grid row
	},

	onCanSelect: function(inRowIndex){
		// summary:
		//		Event to determine if a grid row may be selected
		// inRowIndex: Integer
		//		Index of the grid row
		// returns: Boolean
		//		true if the row can be selected
		return true;
	},

	onCanDeselect: function(inRowIndex){
		// summary:
		//		Event to determine if a grid row may be deselected
		// inRowIndex: Integer
		//		Index of the grid row
		// returns: Boolean
		//		true if the row can be deselected
		return true;
	},

	onSelected: function(inRowIndex){
		// summary:
		//		Event fired when a grid row is selected
		// inRowIndex: Integer
		//		Index of the grid row
		this.updateRowStyles(inRowIndex);
	},

	onDeselected: function(inRowIndex){
		// summary:
		//		Event fired when a grid row is deselected
		// inRowIndex: Integer
		//		Index of the grid row
		this.updateRowStyles(inRowIndex);
	},

	onSelectionChanged: function(){
	}
});
});