Adding implementation for NSSelection and skeletal implementation for NSOutlineView. GJC

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@11248 72102866-910b-0410-8b05-ffd578937521

Source/NSSelection.m

@@ -1,10 +1,14 @@
 /* 
    NSSelection.m
 
-   Description...
+   Description: NSSelection is used by NSDataLink to refer to a 
+                selection within a document.
 
    Copyright (C) 1996 Free Software Foundation, Inc.
 
+   Author:  Gregory John Casamento <greg_casamento@yahoo.com>
+   Date: 2001
+
    Author:  Scott Christley <scottc@net-community.com>
    Date: 1996
    
@@ -27,10 +31,64 @@
 */ 
 
 #include <gnustep/gui/config.h>
+#include <Foundation/NSCoder.h>
+#include <Foundation/NSData.h>
 #include <AppKit/NSSelection.h>
+#include <AppKit/NSPasteboard.h>
+
+//
+// Global instances of these selections
+//
+static NSSelection *_sharedAllSelection = nil;
+static NSSelection *_sharedCurrentSelection = nil;
+static NSSelection *_sharedEmptySelection = nil;
+
+// Private methods and variables for NSSelection
+typedef enum 
+{
+  GSCustomSelection,
+  GSAllSelection,
+  GSCurrentSelection,
+  GSEmptySelection
+} GSSelectionType;
+
+@interface NSSelection (PrivateMethods)
+- (void)_setIsWellKnownSelection: (BOOL)wellknown;
+- (GSSelectionType)_selectionType;
+- (void)_setSelectionType: (GSSelectionType)type;
++ (NSSelection *)_wellKnownSelection: (char *)description;
+@end
+
+@implementation NSSelection (PrivateMethods)
+- (void)_setIsWellKnownSelection: (BOOL)wellknown
+{
+  _isWellKnownSelection = wellknown;
+}
+
+- (void)_setSelectionType: (GSSelectionType)type
+{
+  _selectionType = type;
+}
+
+- (GSSelectionType)_selectionType
+{
+  return _selectionType;
+}
+
++ (NSSelection *)_wellKnownSelection: (char *)description
+{
+  NSData *selectionData = [NSData dataWithBytes: description
+				  length: strlen(description)];
+  NSSelection *selection = 
+    [NSSelection selectionWithDescriptionData: selectionData];
+
+  [selection _setIsWellKnownSelection: YES];
+
+  return selection;
+}
+@end
 
 @implementation NSSelection
-
 //
 // Class methods
 //
@@ -46,19 +104,41 @@
 //
 // Returning Special Selection Shared Instances
 //
+//
+// NOTE: The description returned for each of these is similar to the one
+//       returned under OPENSTEP.
+//
 + (NSSelection *)allSelection
 {
-  return nil;
+  if(!_sharedAllSelection)
+    {
+      _sharedAllSelection =
+	[NSSelection _wellKnownSelection: "GNUstep All selection marker"];
+      [_sharedEmptySelection _setSelectionType: GSAllSelection];
+    }
+  return _sharedAllSelection;
 }
 
 + (NSSelection *)currentSelection
 {
-  return nil;
+  if(!_sharedCurrentSelection)
+    {
+      _sharedCurrentSelection =
+	[NSSelection _wellKnownSelection: "GNUstep Current selection marker"];
+      [_sharedCurrentSelection _setSelectionType: GSCurrentSelection];
+    }
+  return _sharedCurrentSelection;
 }
 
 + (NSSelection *)emptySelection
 {
-  return nil;
+  if(!_sharedEmptySelection)
+    {
+      _sharedEmptySelection =
+	[NSSelection _wellKnownSelection: "GNUstep Empty selection marker"];
+      [_sharedEmptySelection _setSelectionType: GSEmptySelection];
+    }
+  return _sharedEmptySelection;
 }
 
 //
@@ -66,7 +146,9 @@
 //
 + (NSSelection *)selectionWithDescriptionData:(NSData *)data
 {
-  return nil;
+  NSSelection *selection = 
+    AUTORELEASE([[NSSelection alloc] initWithDescriptionData: data]);
+  return selection;
 }
 
 //
@@ -78,12 +160,21 @@
 //
 - (id)initWithDescriptionData:(NSData *)newData
 {
-  return nil;
+  [super init];
+  ASSIGN(_descriptionData, newData);
+  _isWellKnownSelection = NO;
+  _selectionType = GSCustomSelection;
+
+  return self;
 }
 
 - (id)initWithPasteboard:(NSPasteboard *)pasteboard
 {
-  return nil;
+  [super init];
+  ASSIGN(_descriptionData, [pasteboard dataForType: NSGeneralPboardType]);
+  _isWellKnownSelection = NO;
+
+  return self;
 }
 
 //
@@ -91,29 +182,72 @@
 //
 - (NSData *)descriptionData
 {
-  return nil;
+  return _descriptionData;
 }
 
 - (BOOL)isWellKnownSelection
 {
-  return NO;
+  return _isWellKnownSelection;
 }
 
 //
 // Writing a Selection to the Pasteboard
 //
 - (void)writeToPasteboard:(NSPasteboard *)pasteboard
-{}
+{
+  [pasteboard setData: _descriptionData
+	      forType: NSGeneralPboardType];
+}
 
 //
 // NSCoding protocol
 //
 - (void) encodeWithCoder: (NSCoder*)aCoder
 {
+  [aCoder encodeValueOfObjCType: @encode(BOOL)
+	  at: &_isWellKnownSelection];
+  [aCoder encodeValueOfObjCType: @encode(int)
+	  at: &_selectionType];
+  [aCoder encodeValueOfObjCType: @encode(id)
+	  at: _descriptionData];
 }
 
 - (id) initWithCoder: (NSCoder*)aDecoder
 {
+  [super init];
+  [aDecoder decodeValueOfObjCType: @encode(BOOL)
+	    at: &_isWellKnownSelection];
+  [aDecoder decodeValueOfObjCType: @encode(int)
+	    at: &_selectionType];
+
+  // if it's a well known selection then determine which one it is.
+  if(_isWellKnownSelection)
+    {
+      switch(_selectionType)
+	{
+	case GSAllSelection:
+	  RELEASE(self);
+	  self = RETAIN([NSSelection allSelection]);
+	  break;
+	case GSCurrentSelection:
+	  RELEASE(self);
+	  self = RETAIN([NSSelection currentSelection]);
+	  break;
+	case GSEmptySelection:
+	  RELEASE(self);
+	  self = RETAIN([NSSelection emptySelection]);
+	  break;
+	default:
+	  // Shouldn't get here.
+	  break;
+	}
+    }
+  else
+    {
+      [aDecoder decodeValueOfObjCType: @encode(id)
+		at: _descriptionData];
+    }
+
   return self;
 }