/*

     File: MyBaseGradientView.m 

 Abstract: The base NSView class for drawing any variation of NSGradient.

  Version: 1.1 

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 */

#import "MyBaseGradientView.h"

@implementation MyBaseGradientView

// -------------------------------------------------------------------------------

//  resetGradient:

//

//  Remove the current NSGradient and set one up again with the current start

//  and end colors.

// -------------------------------------------------------------------------------

- (void)resetGradient

{

    if (forceColorChange && myGradient != nil)

    {

        [myGradient release];

        myGradient = nil;

    }

    if (myGradient == nil)

    {

        myGradient = [[NSGradient alloc] initWithStartingColor:myStartColor endingColor:myEndColor];

        forceColorChange = NO;

    }

}

// -------------------------------------------------------------------------------

//  setStartColor:startColor

//

//  This method is called when the user changes the start color swatch,

//  which requires that the NSGradient be re-created.

// -------------------------------------------------------------------------------

- (void)setStartColor:(NSColor*)startColor

{

    myStartColor = startColor;

    forceColorChange = YES;

    [self setNeedsDisplay:YES]; // make sure we update the change

}

// -------------------------------------------------------------------------------

//  setEndColor:endColor

//

//  This method is called when the user changes the end color swatch,

//  which requires that the NSGradient be re-created.

// -------------------------------------------------------------------------------

- (void)setEndColor:(NSColor*)endColor

{

    myEndColor = endColor;

    forceColorChange = YES;

    [self setNeedsDisplay:YES]; // make sure we update the change

}

// -------------------------------------------------------------------------------

//  setAngle:angle

//

//  This method is called when the user changes the angle indicator,

//  which requires a re-display or update on this view.

// -------------------------------------------------------------------------------

- (void)setAngle:(CGFloat)angle

{

    myAngle = angle;

    [self setNeedsDisplay:YES]; // make sure we update the change

}

// -------------------------------------------------------------------------------

//  setRadialDraw:isRadial

//

//  This method is called when the user changes the radial flag (checkbox state),

//  which requires a re-display or update on this view.

// -------------------------------------------------------------------------------

- (void)setRadialDraw:(BOOL)isRadial

{

    myIsRadial = isRadial;

    [self setNeedsDisplay:YES]; // make sure we update the change

}

// -------------------------------------------------------------------------------

//  getRelativeCenterPositionFromEvent:theEvent

//

//  Computes the offset point for the radial NSGradient based on the mouse position.

// -------------------------------------------------------------------------------

- (NSPoint)getRelativeCenterPositionFromEvent:(NSEvent*)theEvent

{

    NSPoint curMousePt = [self convertPoint:[theEvent locationInWindow] fromView:nil];

    NSPoint pt = NSMakePoint( (curMousePt.x - NSMidX([self bounds])) / ([self bounds].size.width / 2.0),

                              (curMousePt.y - NSMidY([self bounds])) / ([self bounds].size.height / 2.0));

    return pt;

}

// -------------------------------------------------------------------------------

//  mouseDown:theEvent

//

//  If the user mouseDowns in this view and we are drawing a radial NSGradient,

//  update the view's gradient with the current mouse position as the offset.

// -------------------------------------------------------------------------------

- (void)mouseDown:(NSEvent*)theEvent

{

    if (myIsRadial)

    {

        myOffsetPt = [self getRelativeCenterPositionFromEvent: theEvent];

        [self setNeedsDisplay:YES]; // make sure we update the change

    }

}

// -------------------------------------------------------------------------------

//  mouseDragged:theEvent

//

//  If the user drags the mouse inside this view and we are drawing a radial NSGradient,

//  update the view's gradient with the current mouse position as the offset.

// -------------------------------------------------------------------------------

- (void)mouseDragged:(NSEvent*)theEvent

{

    if (myIsRadial)

    {

        myOffsetPt = [self getRelativeCenterPositionFromEvent: theEvent];

        [self setNeedsDisplay:YES]; // make sure we update the change

    }

}

@end