File: programming/cocoa/WindowFlipper.zip/WindowFlipper/UKWindowFlipperAppDelegate.m

//
//  UKWindowFlipperAppDelegate.m
//  WindowFlipper
//
//  Created by Uli Kusterer on 29.03.05.
//  Copyright 2005 M. Uli Kusterer. All rights reserved.
//
 
#import "UKWindowFlipperAppDelegate.h"
#import <math.h>
 
 
#define NUM_FRAMES      8
#define SLICE_WIDTH     4
#define FRAME_INTERVAL  0.05
 
 
@implementation UKWindowFlipperAppDelegate
 
-(void) resetAnimationFrame: (id)sender
{
    [win flipWindowTransitionWithHalfwayMessage: @selector(pageSwitch:) target: self];
}
 
 
-(void) pageSwitch: (id)sender
{
    [tv selectTabViewItemAtIndex: ![tv indexOfTabViewItem: [tv selectedTabViewItem]]];
}
 
@end
 
 
@implementation NSWindow (UKFlipWindow)
 
NSImage*        gVirginImage = nil;
NSImageView*    gAnimationImageView = nil;
NSTimer*        gAnimationTimer = nil;
int             gCurrAnimationFrame = 0;
SEL             gHalfwayMessage = 0;
id              gHalfwayMsgTarget = nil;
 
-(void) flipWindowTransitionWithHalfwayMessage: (SEL)sel target: (id)targ
{
    NSRect      cRect = [self contentRectForFrameRect: [self frame]];
    NSWindow*   overlay = [[NSWindow alloc] initWithContentRect: cRect styleMask: NSBorderlessWindowMask backing: NSBackingStoreBuffered defer: YES];
    [overlay setHasShadow: NO];
    [overlay setOpaque: NO];
    [overlay setBackgroundColor: [NSColor clearColor]];
    
    gHalfwayMsgTarget = targ;
    gHalfwayMessage = sel;
    
    cRect.origin = NSZeroPoint;
    gAnimationImageView = [[[NSImageView alloc] initWithFrame: cRect] autorelease];
    [gAnimationImageView setAutoresizingMask: NSViewWidthSizable | NSViewHeightSizable];
    [[overlay contentView] addSubview: gAnimationImageView];
    
    [self takeSnapshot];
    gAnimationTimer = [[NSTimer scheduledTimerWithTimeInterval: FRAME_INTERVAL target: self selector:@selector(nextFlipAnimationFrame:)
                            userInfo: nil repeats: YES] retain];
}
 
 
-(void) takeSnapshot
{
    NSView*     borderView = [[self contentView] superview];
    NSData*     pdfData = [borderView dataWithPDFInsideRect: [borderView frame]];
    gVirginImage = [[NSImage alloc] initWithData: pdfData];
    [gAnimationImageView setImage: gVirginImage];
    
    NSRect      box = NSInsetRect([self frame], -18, -18 );
    [[gAnimationImageView window] setFrame: box display: NO];
    
    [[gAnimationImageView window] orderFront: nil];
    [self orderOut: nil];
}
 
 
-(void) nextFlipAnimationFrame: (NSTimer*)sender
{
    NSImage*    destImg = gVirginImage;
    NSRect      vSrcStrip = { { 0, 0 }, { 0, 0 } },
                vDstStrip,
                vFillStrip;
    NSSize      wdSize = [gVirginImage size];
    float       x = 0;
    float       stepSize = wdSize.height / wdSize.width;
    
    if( gCurrAnimationFrame < NUM_FRAMES )
    {
        destImg = [[[NSImage alloc] initWithSize: wdSize] autorelease];
        
        stepSize -= stepSize / 20 * (20 -gCurrAnimationFrame);
        
        [destImg lockFocus];
            for( x = 0; x < wdSize.width; x += SLICE_WIDTH )
            {
                vSrcStrip.origin.x = x;
                vSrcStrip.size.height = wdSize.height; 
                vSrcStrip.size.width = SLICE_WIDTH;
                vDstStrip = vSrcStrip;
                vDstStrip.origin.x = x;
                vDstStrip.size.height -= (wdSize.width -x) * stepSize;
                vDstStrip.origin.y += (wdSize.height -vDstStrip.size.height) / 2;
                [gVirginImage drawInRect: vDstStrip fromRect: vSrcStrip operation: NSCompositeCopy fraction:1.0];
            }
        [destImg unlockFocus];
        
        [destImg setScalesWhenResized: YES];
        [destImg setSize: NSMakeSize( fmaxf(1,(wdSize.width / NUM_FRAMES) * (NUM_FRAMES -1 -gCurrAnimationFrame)), wdSize.height)];
        
        gCurrAnimationFrame++;
    }
    else if( gCurrAnimationFrame < (NUM_FRAMES *2) )
    {
        float       cf = gCurrAnimationFrame -NUM_FRAMES;
        destImg = [[[NSImage alloc] initWithSize: wdSize] autorelease];
        
        if( gCurrAnimationFrame == NUM_FRAMES )
        {
            [gHalfwayMsgTarget performSelector: gHalfwayMessage withObject: self];
            [self takeSnapshot];
        }
        
        stepSize -= stepSize / NUM_FRAMES * (cf +1);
        
        [destImg lockFocus];
            for( x = 0; x < wdSize.width; x += SLICE_WIDTH )
            {
                vSrcStrip.origin.x = (wdSize.width) -x;
                vSrcStrip.size.height = wdSize.height; 
                vSrcStrip.size.width = SLICE_WIDTH;
                vDstStrip = vSrcStrip;
                vDstStrip.origin.x = (wdSize.width) -x;
                vDstStrip.size.height -= (wdSize.width -x) * stepSize;
                vDstStrip.origin.y += (wdSize.height -vDstStrip.size.height) / 2;
                [gVirginImage drawInRect: vDstStrip fromRect: vSrcStrip operation: NSCompositeCopy fraction:1.0];
            }
        [destImg unlockFocus];
        
        [destImg setScalesWhenResized: YES];
        [destImg setSize: NSMakeSize( fmaxf(1,(wdSize.width / NUM_FRAMES) * cf), wdSize.height)];
        
        gCurrAnimationFrame++;
    }
    else if( gCurrAnimationFrame == (NUM_FRAMES *2) )
    {
        [gAnimationImageView setImage: gVirginImage];
        [self makeKeyAndOrderFront: nil];
        [[gAnimationImageView window] orderOut: nil];
        
        [gAnimationTimer autorelease];
        [gAnimationTimer invalidate];
        gAnimationTimer = nil;
        [gVirginImage release];
        gVirginImage = nil;
        [[gAnimationImageView window] release];
        gAnimationImageView = nil;
        gCurrAnimationFrame = 0;
    }
    
    if( destImg != gVirginImage && gAnimationImageView != nil )
    {
        wdSize = [destImg size];
        wdSize.height += 32;
        wdSize.width += 32;
        NSImage*    shadedImg = [[[NSImage alloc] initWithSize: wdSize] autorelease];
        NSShadow*   shad = [[[NSShadow alloc] init] autorelease];
        NSPoint     paintPoint = { 16, 16 };
        [shadedImg lockFocus];
            [NSGraphicsContext saveGraphicsState];
            [shad setShadowOffset: NSMakeSize(0,-8)];
            [shad setShadowBlurRadius: 16];
            [shad setShadowColor: [NSColor colorWithCalibratedWhite: 0 alpha: 0.8]];
            [shad set];
            [destImg compositeToPoint: paintPoint operation: NSCompositeSourceOver];
            [NSGraphicsContext restoreGraphicsState];
            [destImg compositeToPoint: paintPoint operation: NSCompositeSourceOver];
        [shadedImg unlockFocus];
        
        [gAnimationImageView setImage: shadedImg];
    }
}
 
@end