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//
// UKPaintView.m
// UKPaintView
//
// Created by Uli Kusterer on Fri Oct 31 2003.
// Copyright (c) 2003 M. Uli Kusterer. All rights reserved.
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//

#import "ULIPaintView.h"
#import "ULIPaintTool.h"


@implementation ULIPaintView

-(id) initWithFrame: (NSRect)frame
{
    if(( self = [super initWithFrame:frame] ))
{
        image = [[NSImage alloc] initWithSize: frame.size];
[image lockFocus];
[image unlockFocus];
        tempTrackImage = [[NSImage alloc] initWithSize: frame.size];
[tempTrackImage lockFocus];
[tempTrackImage unlockFocus];
        floatingSelectionImage = [[NSImage alloc] initWithSize: frame.size];
[floatingSelectionImage lockFocus];
[floatingSelectionImage unlockFocus];
lineSize = NSMakeSize( 1, 1 );
lineColor = [[NSColor blackColor] retain];
fillColor = [[NSColor clearColor] retain];
undoManager = [[NSUndoManager alloc] init];
selectionAlpha = 1.0;
selectionTimer = nil;
selectionTimerDelta = -0.2;
drawSelectionHighlight = YES;
}
    return self;
}

-(void) dealloc
{
[undoManager release];
[image release];
[tempTrackImage release];
[floatingSelectionImage release];
[fillColor release];
[lineColor release];
[selectionTimer invalidate];
selectionTimer = nil;

[super dealloc];
}


-(void) awakeFromNib
{
[[self window] invalidateCursorRectsForView: self]; // Make sure cursor looks right.
}


-(void) setDrawSelectionHighlight: (BOOL)state
{
drawSelectionHighlight = state;
}


-(BOOL) drawSelectionHighlight
{
return drawSelectionHighlight;
}


-(void) animateSelection: (NSTimer*)sender
{
selectionAlpha += selectionTimerDelta;
if( selectionTimerDelta > 0 && selectionAlpha > 1.0 )
{
selectionAlpha = 1.0;
selectionTimerDelta = -0.2;
}
else if( selectionTimerDelta < 0 && selectionAlpha < 0.0 )
{
selectionAlpha = 0.0;
selectionTimerDelta = 0.2;
}
selectionPhase += 0.3;
if( selectionPhase > 1.0 )
selectionPhase = 0;
[self setNeedsDisplayInRect: NSInsetRect(selectionFrame,-4,-4)];
}


-(NSImage*) floatingSelectionImage
{
return floatingSelectionImage;
}


-(void) setFrame: (NSRect) newbox
{
[super setFrame: newbox];
newbox = [self frame];

NS_DURING
[image setSize: newbox.size];
[tempTrackImage setSize: newbox.size];
NS_HANDLER
NSLog( @"%s: Couldn't resize image: %@", __FUNCTION__, localException );
NS_ENDHANDLER
}


-(void) drawSelectionHighlightAroundPath: (NSBezierPath*)thePath
{
[[[NSColor keyboardFocusIndicatorColor] colorWithAlphaComponent: selectionAlpha] setStroke];
[[NSColor clearColor] setFill];
[thePath setLineWidth: 3];
float pattern[2] = { 6, 6 };
[thePath setLineDash: pattern count: 2 phase: selectionPhase * 12.0];
[thePath stroke];
}


-(void) selectionHighlightNeedsDisplayForRect: (NSRect)box
{
[self setNeedsDisplayInRect: NSInsetRect(box,-4,-4)];
}


-(void) drawRect: (NSRect)rect
{
    [image drawInRect: rect fromRect: rect operation: NSCompositeSourceOver fraction: 1.0];
NSRect selBounds = NSZeroRect;
selBounds.size = [floatingSelectionImage size];
if( selBounds.size.width > 0 && selBounds.size.height > 0 )
{
[floatingSelectionImage drawInRect: selectionFrame fromRect: selBounds operation: NSCompositeSourceOver fraction: 1.0];
if( drawSelectionHighlight )
[self drawSelectionHighlightAroundPath: selectionPath];
}
    [tempTrackImage drawInRect: rect fromRect: rect operation: NSCompositeSourceOver fraction: 1.0];
}


- (void)moveRight:(id)sender
{
[self selectionHighlightNeedsDisplayForRect: selectionFrame];
selectionFrame.origin.x += 1;
selectionAlpha = 0; // So user sees what she's doing.
[self selectionHighlightNeedsDisplayForRect: selectionFrame];
[[self window] invalidateCursorRectsForView: self];
}


- (void)moveLeft:(id)sender
{
[self selectionHighlightNeedsDisplayForRect: selectionFrame];
selectionFrame.origin.x -= 1;
selectionAlpha = 0; // So user sees what she's doing.
[self selectionHighlightNeedsDisplayForRect: selectionFrame];
[[self window] invalidateCursorRectsForView: self];
}


- (void)moveUp:(id)sender
{
[self selectionHighlightNeedsDisplayForRect: selectionFrame];
selectionFrame.origin.y += 1;
selectionAlpha = 0; // So user sees what she's doing.
[self selectionHighlightNeedsDisplayForRect: selectionFrame];
[[self window] invalidateCursorRectsForView: self];
}


- (void)moveDown:(id)sender
{
[self selectionHighlightNeedsDisplayForRect: selectionFrame];
selectionFrame.origin.y -= 1;
selectionAlpha = 0; // So user sees what she's doing.
[self selectionHighlightNeedsDisplayForRect: selectionFrame];
[[self window] invalidateCursorRectsForView: self];
}


- (void)cut:(id)sender
{
[self copy: sender];
[self delete: sender];
}


- (void)copy:(id)sender
{
NSData* tiffData = [floatingSelectionImage TIFFRepresentation];
[[NSPasteboard generalPasteboard] declareTypes: [NSArray arrayWithObject: NSTIFFPboardType] owner: nil];
[[NSPasteboard generalPasteboard] setData: tiffData forType: NSTIFFPboardType];
}


- (void)paste:(id)sender
{
NSData* tiffData = [[NSPasteboard generalPasteboard] dataForType: NSTIFFPboardType];
[self removeSelection];

[floatingSelectionImage release];
floatingSelectionImage = [[NSImage alloc] initWithData: tiffData];
NSSize selectionSize = [floatingSelectionImage size];
if( selectionFrame.size.width == 0 || selectionFrame.size.height == 0 )
{
if( selectionFrame.origin.x == 0 && selectionFrame.origin.y == 0 ) // Was completely empty selection?
{
// Center pasted image:
NSSize imgSize = [image size];
selectionFrame.origin.x = truncf((imgSize.width -selectionSize.width) /2);
selectionFrame.origin.y = truncf((imgSize.height -selectionSize.height) /2);
selectionFrame.size = selectionSize;
}
else // Have a click position? Put it there, but at correct size:
selectionFrame.size = selectionSize;
}
// else just fit it in current selection.

// If desired, change tool to selection tool after paste:
if( [self selectionTool] )
[self setCurrentTool: [self selectionTool]];

[[self window] invalidateCursorRectsForView: self];
[self setNeedsDisplay: YES];
}


-(void) removeSelection
{
[self drawSelectionBuffer: self]; // Merge selection with image again.
[self clearSelectionBuffer: self]; // Clear now unneeded selection.
}


- (void)delete:(id)sender
{
[self setSelectionFrame: NSZeroRect];
[floatingSelectionImage setSize: NSMakeSize(8,8)];
[self setNeedsDisplay: YES];
}


- (void) keyDown:(NSEvent*)evt
{
if( [evt keyCode] == 51 )
[self delete: self];
else
{
switch( [[evt characters] characterAtIndex: 0] )
{
case NSDeleteFunctionKey:
case NSDeleteCharFunctionKey:
[self delete: self];
break;

default:
[super keyDown: evt];
break;
}
}
}


- (void)selectAll:(id)sender
{
[self removeSelection];

// Make selection frame encompass whole image:
selectionFrame.origin = NSZeroPoint;
selectionFrame.size = [image size];

// Create a new, empty "image":
NSImage* nuImg = [[NSImage alloc] initWithSize: selectionFrame.size];
[nuImg lockFocus];
[nuImg unlockFocus];

// Remove selection, set selection to old "image" (all is now selected)
// and set the "image" to our new, empty image:
[floatingSelectionImage release];
floatingSelectionImage = image;
image = nuImg;

[[self window] invalidateCursorRectsForView: self];
[self setNeedsDisplay: YES];
}



- (void)unselectAll:(id)sender
{
[self removeSelection];
selectionFrame = NSZeroRect;
[floatingSelectionImage setSize: NSMakeSize(8,8)];

[[self window] invalidateCursorRectsForView: self];
[self setNeedsDisplay: YES];
}



- (void)clear:(id)sender
{
[self delete: sender];
}


-(void) setSelectionPath: (NSBezierPath*)thePath
{
selectionPath = [thePath retain];
selectionFrame = [thePath bounds];
}


-(NSBezierPath*)selectionPath
{
return selectionPath;
}


-(void) setSelectionFrame: (NSRect)box
{
selectionFrame = box;
selectionPath = [[NSBezierPath bezierPathWithRect: selectionFrame] retain];

[[self window] invalidateCursorRectsForView: self];
}


-(NSRect) selectionFrame
{
return selectionFrame;
}


-(void) moveSelectionByX: (float)xDelta andY: (float)yDelta
{
NSRect oldBox = selectionFrame;
NSAffineTransform* trans = [NSAffineTransform transform];
[trans translateXBy: xDelta yBy: yDelta];
[selectionPath transformUsingAffineTransform: trans];

selectionFrame = NSOffsetRect( selectionFrame, xDelta, yDelta );

[self selectionHighlightNeedsDisplayForRect: oldBox];
[self selectionHighlightNeedsDisplayForRect: selectionFrame];
}


-(IBAction) clearMarkersBuffer: (id)sender
{
NSRect box = { { 0, 0 }, { 0, 0 } };

box.size = [tempTrackImage size];

[tempTrackImage lockFocus];
[NSGraphicsContext saveGraphicsState];
[[NSColor clearColor] set];
NSRectFill(box);
[NSGraphicsContext restoreGraphicsState];
[tempTrackImage unlockFocus];

[self setNeedsDisplay: YES]; // Make sure user sees the change.
}


-(IBAction) clearSelectionBuffer: (id)sender
{
NSRect box = { { 0, 0 }, { 0, 0 } };

box.size = [floatingSelectionImage size];

[floatingSelectionImage lockFocus];
[NSGraphicsContext saveGraphicsState];
[[NSColor clearColor] set];
NSRectFill(box);
[NSGraphicsContext restoreGraphicsState];
[floatingSelectionImage unlockFocus];

[self setNeedsDisplay: YES]; // Make sure user sees the change.
}


-(IBAction) drawSelectionBuffer: (id)sender // Draw the selection buffer into the image buffer.
{
NSRect box = NSZeroRect;
box.size = [floatingSelectionImage size];

[image lockFocus];
[floatingSelectionImage drawInRect: selectionFrame fromRect: box operation: NSCompositeSourceOver fraction: 1.0];
[image unlockFocus];

[self setNeedsDisplay: YES]; // Make sure user sees the change.
}


-(void) mouseDown: (NSEvent*)event
{
selectionAlpha = 1.0; // Ensure selection is visible during tracking.

NSRect box = { { 0, 0 }, { 0, 0 } };
NSPoint clickPos = [event locationInWindow];

clickPos = [self convertPoint: clickPos fromView: nil];
if( [currentTool adjustCoordinates] )
{
clickPos.x += 0.5;
clickPos.y += 0.5;
}

lastPos = clickPos;
initialPos = clickPos;

box.size = [image size];

// Register current state with our undo stack:
[undoManager registerUndoWithTarget:self
                selector:@selector(setImage:)
                object: [[image copy] autorelease]];

// Let the tool draw its first "blotch" or whatever:
[currentTool trackingWillStart];

[tempTrackImage lockFocus];
[NSGraphicsContext saveGraphicsState];
[[NSColor clearColor] set];
NSRectFill(box);
[currentTool drawTemporaryTrackingToolShapeFrom: &lastPos to: clickPos];
[NSGraphicsContext restoreGraphicsState];
[tempTrackImage unlockFocus];

[image lockFocus];
[NSGraphicsContext saveGraphicsState];
[currentTool drawTrackingToolShapeFrom: &lastPos to: clickPos];
[NSGraphicsContext restoreGraphicsState];
[image unlockFocus];

[self setNeedsDisplay: YES];

// Tight loop, faster:
NSEvent* currEvt = nil;
BOOL keepGoing = YES;
while( keepGoing )
{
int evtType;

currEvt = [[self window] nextEventMatchingMask: (NSLeftMouseDraggedMask | NSLeftMouseUpMask)
untilDate: [NSDate dateWithTimeIntervalSinceNow: 0.001] inMode: NSEventTrackingRunLoopMode
dequeue: YES];
if( !currEvt )
continue;
else
evtType = [currEvt type];

switch( evtType )
{
case NSLeftMouseDragged:
[self mouseDragged: currEvt];
break;

case NSLeftMouseUp:
[self mouseUp: currEvt];
keepGoing = NO;
break;

default:
[NSApp sendEvent: currEvt];
}
}

}

-(void) mouseDragged: (NSEvent*)event
{
NSRect box = { { 0, 0 }, { 0, 0 } };
NSPoint clickPos = [event locationInWindow];
clickPos = [self convertPoint: clickPos fromView: nil];
if( [currentTool adjustCoordinates] )
{
clickPos.x += 0.5;
clickPos.y += 0.5;
}

box.size = [image size];

[tempTrackImage lockFocus];
[NSGraphicsContext saveGraphicsState];
[[NSColor colorWithCalibratedWhite: 1.0 alpha: 0.0] set];
NSRectFill(box);
[currentTool drawTemporaryTrackingToolShapeFrom: &lastPos to: clickPos];
[NSGraphicsContext restoreGraphicsState];
[tempTrackImage unlockFocus];

[image lockFocus];
[NSGraphicsContext saveGraphicsState];
[currentTool drawTrackingToolShapeFrom: &lastPos to: clickPos];
[NSGraphicsContext restoreGraphicsState];
[image unlockFocus];
}

-(void) mouseUp: (NSEvent*)event
{
NSRect box = { { 0, 0 }, { 0, 0 } };
NSPoint clickPos = [event locationInWindow];
clickPos = [self convertPoint: clickPos fromView: nil];
if( [currentTool adjustCoordinates] )
{
clickPos.x += 0.5;
clickPos.y += 0.5;
}

box.size = [image size];

[tempTrackImage lockFocus];
[NSGraphicsContext saveGraphicsState];
[[NSColor colorWithCalibratedWhite: 1.0 alpha: 0.0] set];
NSRectFill(box);
[currentTool drawDisposableToolShapeFrom: &lastPos to: clickPos];
[NSGraphicsContext restoreGraphicsState];
[tempTrackImage unlockFocus];

[image lockFocus];
[NSGraphicsContext saveGraphicsState];
[currentTool drawFinalToolShapeFrom: &lastPos to: clickPos];
[NSGraphicsContext restoreGraphicsState];
[image unlockFocus];

if( [delegate respondsToSelector: @selector(paintViewImageDidChange:)] )
[delegate paintViewImageDidChange: self];
}


-(BOOL) acceptsFirstResponder
{
return (currentTool != nil);
}

-(BOOL) becomeFirstResponder
{
if( currentTool == nil )
return NO;

[[NSColorPanel sharedColorPanel] setShowsAlpha: YES];
[[NSColorPanel sharedColorPanel] setColor: lineColor];

if( !selectionTimer )
{
selectionTimer = [NSTimer scheduledTimerWithTimeInterval: 0.1 target: self selector:@selector(animateSelection:) userInfo: nil repeats: YES];
[[NSRunLoop currentRunLoop] addTimer: selectionTimer forMode: NSEventTrackingRunLoopMode];
}

return YES;
}


-(BOOL) resignFirstResponder
{
[selectionTimer invalidate];
selectionTimer = nil;

return YES;
}


-(IBAction) undo: (id)sender
{
[undoManager undo];
}


-(IBAction) redo: (id)sender
{
[undoManager redo];
}


-(BOOL) validateMenuItem: (NSMenuItem*)menuItem
{
if( [menuItem action] == @selector(undo:) )
return [undoManager canUndo];
else if( [menuItem action] == @selector(redo:) )
return [undoManager canRedo];
else if( [menuItem action] == @selector(paste:) )
return [[NSPasteboard generalPasteboard] availableTypeFromArray: [NSArray arrayWithObject: NSTIFFPboardType]] != nil;
else if( [menuItem action] == @selector(copy:) || [menuItem action] == @selector(cut:)
|| [menuItem action] == @selector(delete:) || [menuItem action] == @selector(clear:)
|| [menuItem action] == @selector(unselectAll:) )
return selectionFrame.size.height > 0 && selectionFrame.size.width > 0;
else if( [menuItem action] == @selector(selectAll:))
{
NSSize imgSize = [image size];
return selectionFrame.origin.x != 0 || selectionFrame.origin.y != 0
|| selectionFrame.size.width != imgSize.width || selectionFrame.size.height != imgSize.height;
}
else
return NO;
}


-(IBAction) takeLineSizeFromObject: (id)sender
{
[self setLineSize: NSMakeSize( [sender floatValue], [sender floatValue] ) ];
[[self window] invalidateCursorRectsForView: self];
}


-(IBAction) takeToolFromObject: (id)sender
{
if( [sender isKindOfClass: [ULIPaintTool class]] )
[self setCurrentTool: sender];
else
[self setCurrentTool: [sender paintTool]];
}


-(ULIPaintTool*) currentTool
{
return currentTool;
}

-(void) setCurrentTool: (ULIPaintTool*)t
{
if( t != currentTool )
{
[self paintToolWillChange: self];
[[currentTool toolButton] setState: 0];
[currentTool release];
currentTool = [t retain];
[[currentTool toolButton] setState: 1];
[[self window] invalidateCursorRectsForView: self];
[self paintToolDidChange: self];
}
}


-(ULIPaintTool*) selectionTool
{
return selectionTool;
}

-(void) setSelectionTool: (ULIPaintTool*)t
{
if( t != selectionTool )
{
[selectionTool release];
selectionTool = [t retain];
}
}


-(void) paintToolDidChange: (id)sender
{
[currentTool paintToolDidLoad: sender];
if( [delegate respondsToSelector: @selector(paintViewToolDidChange:)] )
[delegate paintViewToolDidChange: self];
}


-(void) paintToolWillChange: (id)sender
{
if( [delegate respondsToSelector: @selector(paintViewToolWillChange:)] )
[delegate paintViewToolWillChange: self];
if( [delegate respondsToSelector: @selector(paintToolWillUnload:)] )
[currentTool paintToolWillUnload: sender];
}



-(void) resetCursorRects
{
// +++ FIXME: Should really set selection cursor based on selectionPath, not just selectionFrame.
[self addCursorRect:[self bounds] cursor: [currentTool drawingCursor]];
if( selectionFrame.size.height != 0 && selectionFrame.size.width != 0 )
[self addCursorRect: selectionFrame cursor: [currentTool selectionCursor]];
}


-(BOOL) acceptsFirstMouse: (NSEvent*)theEvent
{
return YES;
}


-(NSUndoManager*) undoManager
{
return undoManager;
}




-(id<ULIPaintViewDelegate>) delegate
{
return delegate;
}


-(void) setDelegate: (id<ULIPaintViewDelegate>)d
{
delegate = d;
}



-(NSImage*) image
{
return image;
}

-(void) setImage: (NSImage*)img
{
// Register current state with our undo stack:
[undoManager registerUndoWithTarget:self
                selector:@selector(setImage:)
                object: [[image copy] autorelease]];

// Do the usual set-accessor dance:
NSImage* nuImg = [img retain];
[image release];
image = nuImg;

// Notify our delegate:
if( [delegate respondsToSelector: @selector(paintViewImageDidChange:)] )
[delegate paintViewImageDidChange: self];

[self setNeedsDisplay: YES]; // Make sure user notices the change.
}


-(NSColor*) lineColor
{
return lineColor;
}

-(void) setLineColor: (NSColor*)col
{
[lineColor release];
lineColor = [col retain];

if( [delegate respondsToSelector: @selector(paintViewLineColorDidChange:)] )
[delegate paintViewLineColorDidChange: self];
}


-(NSColor*) fillColor
{
return fillColor;
}

-(void) setFillColor: (NSColor*)col
{
[fillColor release];
fillColor = [col retain];

if( [delegate respondsToSelector: @selector(paintViewFillColorDidChange:)] )
[delegate paintViewFillColorDidChange: self];
}


-(IBAction) takeLineColorFrom: (NSColorWell*)theControl
{
[self setLineColor: [theControl color]];
}


-(IBAction) takeFillColorFrom: (NSColorWell*)theControl
{
[self setFillColor: [theControl color]];
}


-(NSSize) lineSize
{
return lineSize;
}

-(void) setLineSize: (NSSize)ls
{
lineSize = ls;
}


-(NSPoint) initialPos
{
return initialPos;
}

@end

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