/*

     File: SimpleLayoutView.m

 Abstract: Simple NSView subclass showing animation capabilities. Not a generally reusable class, more demo-ware.

  Version: 1.2

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 */

#import <Cocoa/Cocoa.h>

#import "SimpleLayoutView.h"

/* Default separation between items, and default size of added subviews.

*/

#define SEPARATION 10.0

#define BOXWIDTH 80.0

#define BOXHEIGHT 80.0

@implementation SimpleLayoutView

/* By default NSColorPanel does not show an alpha (opacity) slider; enable it

*/

+ (void)initialize {

    if (self == [SimpleLayoutView class]) {

        [[NSColorPanel sharedColorPanel] setShowsAlpha:YES];

    }

}

/* Start off in column mode. 

*/

- (id)initWithFrame:(NSRect)frame {

    if ((self = [super initWithFrame:frame])) {

        [self setLayoutStyle:ColumnLayout];

    }

    return self;

}

/* Get/set layoutStyle

*/

- (Layout)layoutStyle {

    return layoutStyle;

}

- (void)setLayoutStyle:(Layout)newLayoutStyle {

    if (newLayoutStyle != layoutStyle) {

        layoutStyle = newLayoutStyle;

        [self layout];

    }

}

/* This method returns a rect that is integral in base coordinates.

*/

- (NSRect)integralRect:(NSRect)rect {

    return [self convertRectFromBase:NSIntegralRect([self convertRectToBase:rect])];

}

/* This method simply computes the new layout, and calls setFrame: on all subview with their locations. Since the calls are made to the subviews' animators, the subview animate to their new locations.

*/

- (void)layout {

    NSArray *subviews = [self subviews];

    switch ([self layoutStyle]) {

        case ColumnLayout: {

            NSPoint curPoint = NSMakePoint([self bounds].size.width / 2.0, 0.0);            // Starting point: center bottom of view

            for (NSView *subview in subviews) {

                NSRect frame = NSMakeRect(curPoint.x - BOXWIDTH / 2.0, curPoint.y, BOXWIDTH, BOXHEIGHT);    // Centered horizontally, stacked higher

                [[subview animator] setFrame:[self integralRect:frame]];

                curPoint.y += frame.size.height + SEPARATION;                // Next view location; we're stacking higher

            }

            break;

        }

        case RowLayout: {

            NSPoint curPoint = NSMakePoint(0.0, [self bounds].size.height / 2.0);        // Starting point: center left edge of view

            for (NSView *subview in subviews) {

                NSRect frame = NSMakeRect(curPoint.x, curPoint.y - BOXHEIGHT / 2.0, BOXWIDTH, BOXHEIGHT);    // Centered vertically, stacked left to right

                [[subview animator] setFrame:[self integralRect:frame]];

                curPoint.x += frame.size.width + SEPARATION;                // Next view location

            }

            break;

        }

        case GridLayout: {

            NSInteger viewsPerSide = ceil(sqrt([subviews count]));          // Put the views in a roughly square grid

            NSInteger index = 0;

            NSPoint curPoint = NSZeroPoint;                                 // Starting at the bottom left corner

            for (NSView *subview in subviews) {

                NSRect frame = NSMakeRect(curPoint.x, curPoint.y, BOXWIDTH, BOXHEIGHT);

                [[subview animator] setFrame:[self integralRect:frame]];

                curPoint.x += BOXWIDTH + SEPARATION;                        // Stack them horizontally

                if ((++index) % viewsPerSide == 0) {                        // And if we have enough on this row, move up to the next

                    curPoint.x = 0;                

                    curPoint.y += BOXHEIGHT + SEPARATION;

                }

            }

            break;

        }

        default:;

    }

}

/* Changing frame (which is what happens when the window is resized) should cause relayout.

*/

- (void)setFrameSize:(NSSize)size {

    [super setFrameSize:size];

    [self layout];

}

/* Create a new view to be added/animated. Any kind of view can be added here, we go for simple colored box using the Leopard "custom" box type.

*/

- (NSView *)viewToBeAdded {

    NSBox *box = [[[NSBox alloc] initWithFrame:NSMakeRect(0.0, 0.0, BOXWIDTH, BOXHEIGHT)] autorelease];

    [box setBoxType:NSBoxCustom];

    [box setBorderType:NSLineBorder];

    [box setTitlePosition:NSNoTitle];

    [box setFillColor:[boxColorField color]];

    return box;

}

/* Action methods to add/remove boxes, giving us something to animate.  Note that we cause a relayout here; a better design is to relayout in the view automatically on addition/removal of subviews.

*/

- (IBAction)addABox:(id)sender {

    [self addSubview:[self viewToBeAdded]];

    [self layout];

}

- (IBAction)removeLastBox:(id)sender {

    [[[self subviews] lastObject] removeFromSuperview];        // This removes and releases the view

    [self layout];

}

/* Action method to change layout style.

*/

- (IBAction)changeLayout:(id)sender {

    [self setLayoutStyle:[sender selectedTag]];

}

@end