trunk/NumberInput 2/NumberInputController.m

/*
 
File:NumberInputController.m
 
Abstract: Number input controller class.
 
Version: 1.0
 
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*/
#import "NumberInputController.h"
#import "ConversionEngine.h"
#import "NumberInputApplicationDelegate.h"
 
 
@implementation NumberInputController
 
/*
Implement one of the three ways to receive input from the client. 
Here are the three approaches:
                 
                 1.  Support keybinding.  
                        In this approach the system takes each keydown and trys to map the keydown to an action method that the input method has implemented.  If an action is found the system calls didCommandBySelector:client:.  If no action method is found inputText:client: is called.  An input method choosing this approach should implement
                        -(BOOL)inputText:(NSString*)string client:(id)sender;
                        -(BOOL)didCommandBySelector:(SEL)aSelector client:(id)sender;
                        
                2. Receive all key events without the keybinding, but do "unpack" the relevant text data.
                        Key events are broken down into the Unicodes, the key code that generated them, and modifier flags.  This data is then sent to the input method's inputText:key:modifiers:client: method.  For this approach implement:
                        -(BOOL)inputText:(NSString*)string key:(NSInteger)keyCode modifiers:(NSUInteger)flags client:(id)sender;
                        
                3. Receive events directly from the Text Services Manager as NSEvent objects.  For this approach implement:
                        -(BOOL)handleEvent:(NSEvent*)event client:(id)sender;
*/
 
/*!
    @method     
    @abstract   Receive incoming text.
    @discussion This method receives key board input from the client application.  The method receives the key input as an NSString. The string will have been created from the keydown event by the InputMethodKit.
*/
-(BOOL)inputText:(NSString*)string client:(id)sender
{
        // Return YES to indicate the the key input was received and dealt with.  Key processing will not continue in that case.
        // In other words the system will not deliver a key down event to the application.
        // Returning NO means the original key down will be passed on to the client.
        BOOL                    inputHandled = NO;
        // The parser is an NSScanner.
        NSScanner*              scanner = [NSScanner scannerWithString:string];
        NSDecimal               decimalValue;
        // Check the input.  If it is possibly part of a decimal number remember that.
        BOOL                    isDecimal = [scanner scanDecimal:&decimalValue];
 
        if ( isDecimal ) {
            // If the input text is part of a decimal number, add it to the original buffer, and return that we handled it.
            [self originalBufferAppend:string client:sender];
            inputHandled = YES;
        }
        else {
            // If the input isn't part of a decimal number see if we need to convert the previously input text.
            inputHandled = [self convert:string client:sender];
        }
        return inputHandled;
}
 
/*!
    @method     
    @abstract   Called when a user action was taken that ends an input session.   Typically triggered by the user selecting a new input method or keyboard layout.
    @discussion When this method is called your controller should send the current input buffer to the client via a call to insertText:replacementRange:.  Additionally, this is the time to clean up if that is necessary.
*/
 
-(void)commitComposition:(id)sender 
{
    NSString*       text = [self composedBuffer];
 
    if ( text == nil || [text length] == 0 ) {
        text = [self originalBuffer];
    }
    
    [sender insertText:text replacementRange:NSMakeRange(NSNotFound, NSNotFound)];
    
    [self setComposedBuffer:@""];
    [self setOriginalBuffer:@""];
    _insertionIndex = 0;
    _didConvert = NO;
}
 
// Return the composed buffer.  If it is NIL create it.  
-(NSMutableString*)composedBuffer;
{
    if ( _composedBuffer == nil ) {
        _composedBuffer = [[NSMutableString alloc] init];
    }
    return _composedBuffer;
}
 
// Change the composed buffer.
-(void)setComposedBuffer:(NSString*)string
{
    NSMutableString*        buffer = [self composedBuffer];
    [buffer setString:string];
}
 
 
// Get the original buffer.
-(NSMutableString*)originalBuffer
{
    if ( _originalBuffer == nil ) {
        _originalBuffer = [[NSMutableString alloc] init];
    }
    return _originalBuffer;
}
 
// Add newly input text to the original buffer.
-(void)originalBufferAppend:(NSString*)string client:(id)sender
{
    NSMutableString*        buffer = [self originalBuffer];
    [buffer appendString: string];
    _insertionIndex++;
    [sender setMarkedText:buffer selectionRange:NSMakeRange(0, [buffer length]) replacementRange:NSMakeRange(NSNotFound, NSNotFound)];
}
 
// Change the original buffer.
-(void)setOriginalBuffer:(NSString*)string
{
    NSMutableString*        buffer = [self originalBuffer];
    [buffer setString:string];
}
 
// This method is called to see if your input method handles an NSResponder action.
-(BOOL)didCommandBySelector:(SEL)aSelector client:(id)sender
{
    if ([self respondsToSelector:aSelector]) {
        // The NSResponder methods like insertNewline: or deleteBackward: are
        // methods that return void. didCommandBySelector method requires
        // that you return YES if the command is handled and NO if you do not. 
        // This is necessary so that unhandled commands can be passed on to the
        // client application. For that reason we need to test in the case where
        // we might not handle the command.
        
        // The test here is simple.  Test to see if any text has been aded to the original buffer.
        NSString*       bufferedText = [self originalBuffer];
        
        if ( bufferedText && [bufferedText length] > 0 ) {
            if (aSelector == @selector(insertNewline:) ||
                aSelector == @selector(deleteBackward:) ) {
                    [self performSelector:aSelector withObject:sender];
                    return YES; 
            }
        }
        
    }
    
    return NO;
}
 
// When a new line is input we commit the composition.
- (void)insertNewline:(id)sender
{
    [self commitComposition:sender];
    
}
 
// If backspace is entered remove the preceding character and update the marked text.
- (void)deleteBackward:(id)sender
{
    NSMutableString*        originalText = [self originalBuffer];
    NSString*               convertedString;
 
    if ( _insertionIndex > 0 && _insertionIndex <= [originalText length] ) {
        --_insertionIndex;
        [originalText deleteCharactersInRange:NSMakeRange(_insertionIndex,1)];
        convertedString = [[[NSApp delegate] conversionEngine] convert:originalText];
        [self setComposedBuffer:convertedString];
        [sender setMarkedText:convertedString selectionRange:NSMakeRange(_insertionIndex, 0) replacementRange:NSMakeRange(NSNotFound,NSNotFound)];
    }
}
 
// This method converts buffered text based on the trigger string.  If we did convert the text previously insert the converted text with
// the trigger string appended to the converted text.  
// If we have not done a previous conversion check to see if the input string is a space.  If it is convert the text mark it in the client, and remember that we did do a conversion.
// If the input text is not a string.  Commit the composition, and then insert the input string.
- (BOOL)convert:(NSString*)trigger client:(id)sender
{
    NSString*               originalText = [self originalBuffer];
    NSString*               convertedString = [self composedBuffer];
    BOOL                    handled = NO;
    
    if ( _didConvert && convertedString && [convertedString length] > 0  ) {
        
        
            NSString*       completeString = [convertedString stringByAppendingString:trigger];
            [sender insertText:completeString replacementRange:NSMakeRange(NSNotFound, NSNotFound)];
            
            [self setComposedBuffer:@""];
            [self setOriginalBuffer:@""];
            _insertionIndex = 0;
            _didConvert = NO;
            handled = YES;
 
    }
    else if ( originalText && [originalText length] > 0 ) {
        
            convertedString = [[[NSApp delegate] conversionEngine] convert:originalText];
            [self setComposedBuffer:convertedString];
            
            if ( [trigger isEqual: @" "] ) {
                [sender setMarkedText:convertedString selectionRange:NSMakeRange(_insertionIndex, 0) replacementRange:NSMakeRange(NSNotFound,NSNotFound)];
                _didConvert = YES;
            }
            else {
                [self commitComposition:sender];
                [sender insertText:trigger replacementRange:NSMakeRange(NSNotFound, NSNotFound)];
            }
            handled = YES;
    }
    return handled;
}
 
//This method is called by the InputMethodKit when the user as selected a new input mode from the text input menu.
-(void)setValue:(id)value forTag:(unsigned long)tag client:(id)sender
{
    NSString*       newModeString = [(NSString*)value retain];
    NSNumberFormatterStyle  currentMode = [[[NSApp delegate] conversionEngine] conversionMode];
    NSNumberFormatterStyle newMode;
    
    if ( [newModeString isEqual:kDecimalMode] ) {
        newMode = NSNumberFormatterDecimalStyle;
    }
    else if ( [newModeString isEqual:kCurrencyMode] ) {
        newMode = NSNumberFormatterCurrencyStyle;
    }
    else if ( [newModeString isEqual:kPercentMode] ) {
        newMode = NSNumberFormatterPercentStyle;
    }
    else if ( [newModeString isEqual:kScientificMode] ) {
        newMode = NSNumberFormatterScientificStyle;
    }
    else if ( [newModeString isEqual:kSpelloutMode] ) {
        newMode = NSNumberFormatterSpellOutStyle;
    }
    
    if ( currentMode != newMode ) {
        [[[NSApp delegate] conversionEngine] setConversionMode:newMode];
    }
}
 
-(void)dealloc 
{
    [_composedBuffer release];
    [_originalBuffer release];
    [super dealloc];
}
 
 
@end


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