/*

     File: AppController.m

 Abstract: Manages drag-n-drop, updates the layers when the sliders move

  Version: 1.1

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 */

#import "AppController.h"

@implementation AppController

-(void)awakeFromNib {

    //Load the image and add it to the slice view

    dragImage = YES;

    img = [NSImage imageNamed:@"drag.png"];

    [sliceView setImg:img];

    //Set the initial values for the center slice

    [sliceView sliceWithRect:CGRectMake(0.25, 0.25, 0.5, 0.5)];

    //Create the root layer

    rootLayer = [CALayer layer];

    //Set the root layer's background color to black

    rootLayer.backgroundColor = CGColorGetConstantColor(kCGColorBlack);

    //Build the 9-slice layer with an initial scale of 1

    imgLayer = [CALayer layer];

    imgLayer.contents = img;

    imgLayer.frame = CGRectMake(0, 0, [img size].width, [img size].height);

    imgLayer.contentsCenter = CGRectMake(0.5, 0.5, 1, 1);

    //Build the layer hierarchy and turn on CoreAnimation for the view

    [rootLayer addSublayer:imgLayer];

    [view setLayer:rootLayer];

    [view setWantsLayer:YES];

    //Register to receive notifications when a file is dragged into the window

    [[view window] registerForDraggedTypes:[NSArray arrayWithObject:NSURLPboardType]];

}

//Update the layer with the new slider values

-(IBAction)slidersMoved:(id)sender {

    if (dragImage) {

        return;

    }

    //Update the size

    imgLayer.frame = CGRectMake(0, 0, [img size].width + ([imgWidthSlider floatValue] 

                                    / 100.0) * (rootLayer.bounds.size.width - [img size].width),

                                    [img size].height + ([imgHeightSlider floatValue] 

                                    / 100.0) * (rootLayer.bounds.size.height - [img size].height));

    //Update the dimensions of the center slice

    float cX = [centerXSlider floatValue] / 100.0;

    float cY = [centerYSlider floatValue] / 100.0;

    //Construct the center rect making sure that it stays within the unit rect [0 0 1 1]

    CGRect centerSlice = CGRectMake(cX, 

                                    cY, 

                                    MIN([centerWidthSlider floatValue] / 100.0, 1-cX), 

                                    MIN([centerHeightSlider floatValue] / 100.0, 1-cY));    

    imgLayer.contentsCenter = centerSlice;

    //Update the mini 'sliceView' with the new rect

    [sliceView sliceWithRect:centerSlice];

}

//Reset the slider values

-(IBAction)resetSliders:(id)sender {

    [imgWidthSlider setFloatValue:0];

    [imgHeightSlider setFloatValue:0];

    [centerXSlider setFloatValue:25];

    [centerYSlider setFloatValue:25];

    [centerWidthSlider setFloatValue:50];

    [centerHeightSlider setFloatValue:50];

    [sliceView sliceWithRect:CGRectMake(0.25, 0.25, 0.5, 0.5)];

    [self slidersMoved:self];

}

//Inform the pasteboard that we intend to link to the dragged file

//Used to implement the 'drag-n-drop' feature

- (NSDragOperation)draggingEntered:(id < NSDraggingInfo >)sender {

    return NSDragOperationLink;

}

//If the dragged file is a valid image, update the views. Otherwise reject.

//Used to implement the 'drag-n-drop' feature

- (BOOL)performDragOperation:(id < NSDraggingInfo >)sender {

    NSImage *newImg =  [[NSImage alloc] initWithContentsOfURL:[NSURL URLFromPasteboard:[sender draggingPasteboard]]];

    float h = [newImg size].height;

    float w = [newImg size].width;

    if(h > 0 && w > 0) {

        //Resize the window to fit the new image

        CGRect rect = [[view window] frame];

        if (w > imgLayer.frame.size.width) {

            rect.size.width = MAX(w + 209, 721);

        }

        if (h > imgLayer.frame.size.height) {

            rect.size.height = MAX(h + 62, 574);

        }

        [[view window] setFrame:rect display:YES animate:YES];

        img = newImg;

        sliceView.img = img;

        [self resetSliders:self];

        [imgLayer setContents:img];

        [imgLayer setFrame:CGRectMake(0, 0, w, h)];

        dragImage = NO;

        return YES;

    } else {

        return NO;

    }

}

//Dont let the window become smaller than the image

-(NSSize)windowWillResize:(NSWindow *)window toSize:(NSSize)proposedFrameSize {

    if (rootLayer.bounds.size.width - imgLayer.frame.size.width <= 0 && proposedFrameSize.width < [window frame].size.width) {

        proposedFrameSize.width = MAX([window frame].size.width, 721);

    } 

    if (rootLayer.bounds.size.height - imgLayer.frame.size.height <= 0 && proposedFrameSize.height < [window frame].size.height) {

        proposedFrameSize.height = MAX([window frame].size.height, 574);

    }

    return proposedFrameSize;

}

//Adjust the image size sliders to match the new window area

-(void)windowDidResize:(NSNotification*)aNotification {

    [CATransaction setDisableActions:YES];

    if (dragImage) {

        //If the 'drag' placeholder image is being displayed, center it

        imgLayer.position = CGPointMake(rootLayer.bounds.size.width / 2, rootLayer.bounds.size.height / 2); 

    } else {

        [imgWidthSlider setFloatValue:  100 * (1 - (rootLayer.bounds.size.width - imgLayer.frame.size.width)

                                               / (rootLayer.bounds.size.width - [img size].width))];

        [imgHeightSlider setFloatValue: 100 * (1 - (rootLayer.bounds.size.height - imgLayer.frame.size.height) 

                                               / (rootLayer.bounds.size.height - [img size].height))];

        [self slidersMoved:self];

    }

    [CATransaction setDisableActions:NO];

}

@end