Customize NSTableView to allow for single cell selection

Customize NSTableView to allow for single cell selection Please note that this is NSTableView and not UITableView. This project is for OSX and NOT for iOS. If you have no OSX experience, please move on. I need to have a customized NSTableView class that allows users to select multiple individual cells, rather than an NSTableViews default of selecting full rows. By this, I mean if a user picks a cell (like [login to view URL]) then only a single individual cell is selected. In the state of [login to view URL] table property CellSelections would be an array with one entry containing {row:4,column:5} (represented as an object, not a dictionary). The table must also support selecting MULTIPLE 'individual' cells. For example in [login to view URL], three individual cells have been selected. The table CellSelections variable should return an array of {row:3,column:3},{row:5,column:5},{row:7,column:3} A user should be able to select multiple cells with the following behaviour: 1. If the user has a cell selected, holds the CTRL key and clicks another cell, then now both cells are selected (if CTRL was NOT pressed, then only the new cell is selected). 2. If the user has a single cell selected, holds SHIFT and presses an arrow key on the keyboard, then the corresponding to the direction of the arrow key must be selected. 3. If a user has multiple cells selected that are next to each other either vertically or horizontally and the user holds SHIFT and presses an arrow key then EACH of the surrounding cells must now be selected ([login to view URL]). 4. If the user had multiple cells selected that are NOT next not each other and hits shift + arrow keys, then the top left most selected cell will be considered an individual cell and state#1 should happen. NOTES: - The table must still support double click to edit cells (no matter what CellSelections are highlighted, whatever cell is double clicked will become editable). - Keyboard navigation must work. IE hitting the arrow keys must change the CellSelections (and update the UI to reflect so). If there are multiple cells selected when arrow keys are hit, then navigation must be based on the top-left most selection. - This must be done using an NSTableView and NOT an NSMatrix. - This must support NSTableViews which are cell based. View based is not required but would be nice to have. - This component must work on OS X 10.7+ - The behaviour of this component is based on that of Microsoft SQL Management Studio.