Insert the five outlet instance variables shown here in bold into PrefController.h:

#import <Cocoa/Cocoa.h>

@interface PrefController : NSObject
{
    // Colors tab
    IBOutlet id axesColorWell;
    IBOutlet id graphColorWell;
    IBOutlet id labelColorWell;
    // Initial tab
                            IBOutlet id xminCell;
                            IBOutlet id xmaxCell;
                            IBOutlet id xstepCell;
                            IBOutlet id yminCell;
                            IBOutlet id ymaxCell;

    IBOutlet id window;
}
...
@end

Save PrefController.h.

Open Preferences.nib in IB.

Drag the PrefController.h icon from PB and drop it in the Preferences.nib window in IB.

Select a color well in the Preferences panel in IB and then Shift-select the other two color wells and the labels. Then type Command-X to cut the six selected items (we’ll paste them back later).

Select the Colors box and hit the Delete key (we won’t need it anymore).

Drag a Tab/View icon from IB’s Cocoa-Containers palette and drop it in the Preferences panel.

Size the Tab/View to fit in the Preferences panel (see Figure 21-8).

Double-click inside the Tab/View to tell IB that you want to work within the container.

Type Command-V to paste in the three color wells and their labels.

Reconnect the PrefController’s axesColorWell, graphColorWell, and labelColorWell outlets to their respective color wells (Control-drag from PrefController to each well).

Double-click on the tab labeled “Tab” in the Tab/View and change the label to read “Colors”.

Click the tab labeled “View” in the Tab/View. Note that your controls disappear! (Don’t worry — they’re still there — you can make them reappear by clicking the Colors tab.)

Change the word “View” to “Initial”.

Drag out a Field1/Field2 NSForm from the Cocoa-Views palette and drop it in the Initial tab (pane).

Expand the NSForm to five cells. You may want (or need) to shrink the font size or change the intercell spacing. (You can change the intercell spacing by holding down the Command key while resizing the matrix.)

Connect the appropriate PrefController outlets (xmaxCell, xminCell, xstepCell, yminCell, and ymaxCell) to the appropriate cells in the form (Control-drag from PrefController to the fields).

Save the Preferences.nib file.

Insert the lines shown here in bold into the revert: method in the PrefController.m class file:

- (IBAction)revert:(id)sender
{
    NSUserDefaults *defs = [NSUserDefaults standardUserDefaults];

    [self setUpWell:axesColorWell ];
    [self setUpWell:labelColorWell ];
    [self setUpWell:graphColorWell ];
    [xminCell  setObjectValue:[defs objectForKey:GP_xmin]];
                            [xmaxCell  setObjectValue:[defs objectForKey:GP_xmax]];
                            [xstepCell setObjectValue:[defs objectForKey:GP_xstep]];
                            [yminCell  setObjectValue:[defs objectForKey:GP_ymin]];
                            [ymaxCell  setObjectValue:[defs objectForKey:GP_ymax]];
}

Insert the five lines shown here in bold into the okay: method in PrefController.m:

- (IBAction)okay:(id)sender
{
    NSUserDefaults *defs = [NSUserDefaults standardUserDefaults];

    [defs setObject:DataForColor([axesColorWell color])
             forKey:GP_AxesColor];

    [defs setObject:DataForColor([labelColorWell color])
             forKey:GP_LabelColor];

    [defs setObject:DataForColor([graphColorWell color])
             forKey:GP_GraphColor];
    [defs setObject:[xminCell objectValue] forKey:GP_xmin];
                            [defs setObject:[xmaxCell objectValue] forKey:GP_xmax];
                            [defs setObject:[xstepCell objectValue] forKey:GP_xstep];
                            [defs setObject:[yminCell objectValue] forKey:GP_ymin];
                            [defs setObject:[ymaxCell objectValue] forKey:GP_ymax];

    [window orderOut:nil];
}

Build and run GraphPaper, saving all files first.

Choose GraphPaper → Preferences.

Select the Initial tab in the Preferences panel, and you should see the initial defaults, as shown in Figure 21-9.

Enter values for all of the initial parameters and click OK (or hit Return). The OK and Revert buttons work as before.

Quit GraphPaper.

Now run GraphPaper again, and the initial values should show up in both the GraphPaper window and the Preferences panel.

Quit GraphPaper.

Double-click the ~/Library/Preferences/com.nitroba.GraphPaper.plist file in the Finder to view the GraphPaper defaults in PropertyListEditor, as shown in Figure 21-10.

Quit GraphPaper.