/** <title>PKPreferencePane</title>

	PKPreferencePane.m
 
	<abstract>Preference pane class (was GSPreferencePane)</abstract>
 
	Copyright (C) 2006 Yen-Ju Chen
	Copyright (C) 2004 Uli Kusterer
 
	Author:  Yen-Ju Chen
	Author:  Uli Kusterer
             Quentin Mathe
	Date:  August 2004
 
	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.
 
	This library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Lesser General Public License for more details.
 
	You should have received a copy of the GNU Lesser General Public
	License along with this library; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#import <PaneKit/PKPane.h>
#import <AppKit/AppKit.h>
#import "GNUstep.h"

NSString *NSPreferencePaneDoUnselectNotification = @"NSPreferencePaneDoUnselect";
NSString *NSPreferencePaneCancelUnselectNotification = @"NSPreferencePaneCancelUnselect";


/* <p>PKPreferencePane Description</p> */
@implementation PKPane

/** <init /> */
- (id) initWithBundle: (NSBundle *) bundle
{
  self = [self init];
  ASSIGN(_bundle, bundle);
  return self;
}

- (void) dealloc
{
  DESTROY(_bundle);
  [_topLevelObjects makeObjectsPerformSelector: @selector(release)];
  DESTROY(_topLevelObjects);
	
  [super dealloc];
}

/** <p>Returns the <em>bundle instance</em> which the preference pane 
    stored.</p> */
- (NSBundle *) bundle
{
  return _bundle;
}

/** <p>Loads preference pane's view by loading the nib file which contains it.
    </p>
    <p>Related nib file is known by -mainNibName.</p> */
- (NSView *) loadMainView
{
  // NOTE: Paranoid check which eliminates the possibility to reload the nib
  // when the mainView is possibly still in use.
  if ([self mainView] != nil)
    return nil;
    
  ASSIGN(_topLevelObjects, AUTORELEASE([[NSMutableArray alloc] init]));
  NSDictionary* ent = [NSDictionary dictionaryWithObjectsAndKeys:
			self, @"NSOwner",
			_topLevelObjects, @"NSTopLevelObjects",
			nil];

  if ( ![_bundle loadNibFile: [self mainNibName] externalNameTable: ent 
                   withZone: [self zone]] )
  {
    NSLog(@"Failed to load main view bundle");
    return nil;
  }
	
  [self assignMainView];
  [self mainViewDidLoad];
	
  return _mainView;
}

/** <p>Assigns the main view loaded with -loadMainView.</p>
    <p>By default this method, retrieves the main view by calling 
    -contentView on window referenced in the nib file by 
    <code>_window</code> outlet.</p>
    <p><em>Overrides this method if your preference pane
    view is located in different place within the nib file.</em> Takes note that when 
    assignement is done, <code>_window</code> is released and sets to 
    nil. Finally this method returns -mainView if no 
    errors occured, otherwise nil.</p> */
- (NSView *) assignMainView
{
  [self setMainView: [_window contentView]];
  DESTROY(_window);
	
  return [self mainView];
}

/** <p>Returns the nib name advertised as <em>main</em> in enclosing bundle's 
    property list.</p>
    <p>Related nib file is known by mainNibName.</p> */
- (NSString *) mainNibName
{
  return [[_bundle infoDictionary] objectForKey: @"NSMainNibFile"];
}

/** <override-subclass /> */
- (void) willSelect {}

/** <override-subclass /> */
- (void) didSelect {}

/** <override-subclass /> */
- (void) willUnselect {}

/** <override-subclass /> */
- (void) didUnselect {}

/** <override-subclass />
    <p>Notifies the preference pane that everything is set up and ready to be 
    displayed, similarly to -windowDidLoad when the main nib file
    has been awaken. It is called by -loadMainView when the main
    view is correctly set. <em>By default this method does nothing.</em></p>
    <p><em>Override this method to have extra preference pane view set up according to 
    its stored settings.</em></p> */
- (void) mainViewDidLoad {}

/** <override-dummy />
    <p>Returns a value to state if the preference pane accepts to be 
    deselected right now. Various values may be returned, look at 
    <code>NSPreferencePaneUnselectReply</code> constants.</p>
    <p>Overrides this method when you want to delay or cancel a deselect 
    request, but take note that you will have to call -replyToShouldUnselect: 
    later (when deselection is processed) if you return 
    <code>NSUnselectLater</code>.</p> */
- (NSPreferencePaneUnselectReply) shouldUnselect
{
  return NSUnselectNow;
}

/** <override-never />
    <p>Asks the preference pane to know if it accepts to be deselected.</p>
    <p>Take care to invoke this method yourself when you have overriden 
    -shouldUnselect to return <code>NSUnselectLater</code> (it
    implies you know when the preference should be unselected).</p> */
- (void) replyToShouldUnselect: (BOOL) shouldUnselect
{
  if ( shouldUnselect )
    [_owner updateUIForPane: nil];
}

/** <p>Sets the <em>preference pane view</em> which is presented to the user.</p>
    <p>Take note, you should avoid to call this method in your code unless you
    have already overriden -loadMainView and 
    -assignMainView.</p> */
-(void) setMainView: (NSView *) view
{
  ASSIGN(_mainView, view);
}

/** <p>Returns the <em>preference pane view</em> which is presented to the 
    user.</p> */
- (NSView *) mainView
{
  return _mainView;
}

/** <p>Returns the view which initially owns the focus in the responder chain 
    when the preference pane view is loaded.</p> */
- (NSView *) initialKeyView
{
  return _initialKeyView;
}

/** <p>Sets the view which initially owns the focus in the responder chain when 
    the preference pane view is loaded.</p> */
- (void) setInitialKeyView: (NSView *) view
{
  ASSIGN(_initialKeyView, view);
}

/** <p>Returns the view which starts the responder chain bound to the 
    preference pane view.</p> */
- (NSView *) firstKeyView
{
  return _firstKeyView;
}

/** <p>Sets the view which starts the responder chain bound to the preference 
    pane view.</p> */
- (void) setFirstKeyView: (NSView *) view
{
  ASSIGN(_firstKeyView, view);
}

/** <p>Returns the view which ends the responder chain bound to the preference 
    pane view.</p> */
- (NSView *) lastKeyView
{
  return _lastKeyView;
}

/** <p>Sets the view which ends the responder chain bound to the preference pane
    view.</p> */
- (void) setLastKeyView: (NSView *) view
{
  ASSIGN(_lastKeyView, view);
}

/** <p>Returns YES when text fields are asked to resign their responder status
    when -shouldUnselect is going to be called, otherwise returns NO if the 
    preference pane must itself request each text field resigning its responder
    status (to have their content saved).</p> 
    <p>By default this method returns YES, but it is possible
    to override it to alter the returned value.</p> */
- (BOOL) autoSaveTextFields
{
  return YES;
}

/** <p>Returns YES when the receiver is the currently selected
    preference pane, otherwise returns NO.</p> */
- (BOOL) isSelected
{
  return( [_owner selectedPane] == self );
}

/** <p><em>Not implemented.</em></p> */
-(void) updateHelpMenuWithArray:(NSArray *)inArrayOfMenuItems
{
  NSLog(@"PKPane: updateHelpMenuWithArray: not yet implemented.");
}

/* Private */
-(void)	setOwner: (id <PKPaneOwner>)owner
{
  _owner = owner;
}

@end