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PSMTabDragAssistant.m
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PSMTabDragAssistant.m
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//
// PSMTabDragAssistant.m
// PSMTabBarControl
//
// Created by John Pannell on 4/10/06.
// Copyright 2006 Positive Spin Media. All rights reserved.
//
#import "PSMTabDragAssistant.h"
#import "PSMTabBarCell.h"
#import "PSMTabStyle.h"
@implementation PSMTabDragAssistant
static PSMTabDragAssistant *sharedDragAssistant = nil;
#pragma mark -
#pragma mark Creation/Destruction
+ (PSMTabDragAssistant *)sharedDragAssistant
{
if (!sharedDragAssistant){
sharedDragAssistant = [[PSMTabDragAssistant alloc] init];
}
return sharedDragAssistant;
}
- (id)init
{
self = [super init];
if (self) {
_sourceTabBar = nil;
_destinationTabBar = nil;
_participatingTabBars = [[NSMutableSet alloc] init];
_draggedCell = nil;
_animationTimer = nil;
_sineCurveWidths = [[NSMutableArray alloc] initWithCapacity:kPSMTabDragAnimationSteps];
_targetCell = nil;
_isDragging = NO;
}
return self;
}
#pragma mark -
#pragma mark Accessors
- (PSMTabBarControl *)sourceTabBar
{
return _sourceTabBar;
}
- (void)setSourceTabBar:(PSMTabBarControl *)tabBar
{
_sourceTabBar = tabBar;
}
- (PSMTabBarControl *)destinationTabBar
{
return _destinationTabBar;
}
- (void)setDestinationTabBar:(PSMTabBarControl *)tabBar
{
_destinationTabBar = tabBar;
}
- (PSMTabBarCell *)draggedCell
{
return _draggedCell;
}
- (void)setDraggedCell:(PSMTabBarCell *)cell
{
_draggedCell = cell;
}
- (int)draggedCellIndex
{
return _draggedCellIndex;
}
- (void)setDraggedCellIndex:(int)value
{
_draggedCellIndex = value;
}
- (BOOL)isDragging
{
return _isDragging;
}
- (void)setIsDragging:(BOOL)value
{
_isDragging = value;
}
- (NSPoint)currentMouseLoc
{
return _currentMouseLoc;
}
- (void)setCurrentMouseLoc:(NSPoint)point
{
_currentMouseLoc = point;
}
- (PSMTabBarCell *)targetCell
{
return _targetCell;
}
- (void)setTargetCell:(PSMTabBarCell *)cell
{
_targetCell = cell;
}
#pragma mark -
#pragma mark Functionality
- (void)startDraggingCell:(PSMTabBarCell *)cell fromTabBar:(PSMTabBarControl *)control withMouseDownEvent:(NSEvent *)event
{
[self setIsDragging:YES];
[self setSourceTabBar:control];
[self setDestinationTabBar:control];
[_participatingTabBars addObject:control];
[self setDraggedCell:cell];
[self setDraggedCellIndex:(int)[[control cells] indexOfObject:cell]];
NSRect cellFrame = [cell frame];
// list of widths for animation
int i;
float cellWidth = cellFrame.size.width;
for(i = 0; i < kPSMTabDragAnimationSteps; i++){
int thisWidth;
thisWidth = (int)(cellWidth - ((cellWidth/2.0) + ((sin((PI/2.0) + ((float)i/(float)kPSMTabDragAnimationSteps)*PI) * cellWidth) / 2.0)));
[_sineCurveWidths addObject:[NSNumber numberWithInt:thisWidth]];
}
// hide UI buttons
[[control overflowPopUpButton] setHidden:YES];
[[control addTabButton] setHidden:YES];
[[NSCursor closedHandCursor] set];
NSPasteboard *pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
NSImage *dragImage = [cell dragImageForRect:cellFrame];
[[cell indicator] removeFromSuperview];
[self distributePlaceholdersInTabBar:control withDraggedCell:cell];
if([control isFlipped]){
cellFrame.origin.y += cellFrame.size.height;
}
[cell setHighlighted:NO];
NSSize offset = NSZeroSize;
[pboard declareTypes:[NSArray arrayWithObjects:@"PSMTabBarControlItemPBType", nil] owner: nil];
[pboard setString:[[NSNumber numberWithInteger:[[control cells] indexOfObject:cell]] stringValue] forType:@"PSMTabBarControlItemPBType"];
_animationTimer = [NSTimer scheduledTimerWithTimeInterval:(1.0/30.0) target:self selector:@selector(animateDrag:) userInfo:nil repeats:YES];
[control dragImage:dragImage at:cellFrame.origin offset:offset event:event pasteboard:pboard source:control slideBack:YES];
}
- (void)draggingEnteredTabBar:(PSMTabBarControl *)control atPoint:(NSPoint)mouseLoc
{
[self setDestinationTabBar:control];
[self setCurrentMouseLoc:mouseLoc];
// hide UI buttons
[[control overflowPopUpButton] setHidden:YES];
[[control addTabButton] setHidden:YES];
if(![[[control cells] objectAtIndex:0] isPlaceholder])
[self distributePlaceholdersInTabBar:control];
[_participatingTabBars addObject:control];
}
- (void)draggingUpdatedInTabBar:(PSMTabBarControl *)control atPoint:(NSPoint)mouseLoc
{
if([self destinationTabBar] != control)
[self setDestinationTabBar:control];
[self setCurrentMouseLoc:mouseLoc];
}
- (void)draggingExitedTabBar:(PSMTabBarControl *)control
{
[self setDestinationTabBar:nil];
[self setCurrentMouseLoc:NSMakePoint(-1.0, -1.0)];
}
- (void)performDragOperation
{
// move cell
[[[self destinationTabBar] cells] replaceObjectAtIndex:[[[self destinationTabBar] cells] indexOfObject:[self targetCell]] withObject:[self draggedCell]];
[[self draggedCell] setControlView:[self destinationTabBar]];
// move actual NSTabViewItem
if([self sourceTabBar] != [self destinationTabBar]){
[[[self sourceTabBar] tabView] removeTabViewItem:[[self draggedCell] representedObject]];
[[[self destinationTabBar] tabView] addTabViewItem:[[self draggedCell] representedObject]];
}
[self finishDrag];
}
- (void)draggedImageEndedAt:(NSPoint)aPoint operation:(NSDragOperation)operation
{
if([self isDragging]){ // means there was not a successful drop (performDragOperation)
// put cell back
[[[self sourceTabBar] cells] insertObject:[self draggedCell] atIndex:[self draggedCellIndex]];
[self finishDrag];
}
}
- (void)finishDrag
{
[self setIsDragging:NO];
[self removeAllPlaceholdersFromTabBar:[self sourceTabBar]];
[self setSourceTabBar:nil];
[self setDestinationTabBar:nil];
for (PSMTabBarControl *tabBar in _participatingTabBars)
[self removeAllPlaceholdersFromTabBar:tabBar];
[_participatingTabBars removeAllObjects];
[self setDraggedCell:nil];
[_animationTimer invalidate];
_animationTimer = nil;
[_sineCurveWidths removeAllObjects];
[self setTargetCell:nil];
}
#pragma mark -
#pragma mark Animation
- (void)animateDrag:(NSTimer *)timer
{
for (PSMTabBarControl *tabBar in _participatingTabBars) {
[self calculateDragAnimationForTabBar:tabBar];
[[NSRunLoop currentRunLoop] performSelector:@selector(display) target:tabBar argument:nil order:1 modes:[NSArray arrayWithObjects:@"NSEventTrackingRunLoopMode", @"NSDefaultRunLoopMode", nil]];
}
}
- (void)calculateDragAnimationForTabBar:(PSMTabBarControl *)control
{
BOOL removeFlag = YES;
NSMutableArray *cells = [control cells];
int i, cellCount = (int)[cells count];
float xPos = [[control style] leftMarginForTabBarControl];
// identify target cell
// mouse at beginning of tabs
NSPoint mouseLoc = [self currentMouseLoc];
if([self destinationTabBar] == control){
removeFlag = NO;
if(mouseLoc.x < [[control style] leftMarginForTabBarControl]){
[self setTargetCell:[cells objectAtIndex:0]];
goto layout;
}
NSRect overCellRect;
PSMTabBarCell *overCell = [control cellForPoint:mouseLoc cellFrame:&overCellRect];
if(overCell){
// mouse among cells - placeholder
if([overCell isPlaceholder]){
[self setTargetCell:overCell];
goto layout;
}
// non-placeholders
if(mouseLoc.x < (overCellRect.origin.x + (overCellRect.size.width / 2.0))){
// mouse on left side of cell
[self setTargetCell:[cells objectAtIndex:([cells indexOfObject:overCell] - 1)]];
goto layout;
} else {
// mouse on right side of cell
[self setTargetCell:[cells objectAtIndex:([cells indexOfObject:overCell] + 1)]];
goto layout;
}
} else {
// out at end - must find proper cell (could be more in overflow menu)
[self setTargetCell:[control lastVisibleTab]];
goto layout;
}
} else {
[self setTargetCell:nil];
}
layout:
for(i = 0; i < cellCount; i++){
PSMTabBarCell *cell = [cells objectAtIndex:i];
NSRect newRect = [cell frame];
if(![cell isInOverflowMenu]){
if([cell isPlaceholder]){
if(cell == [self targetCell]){
[cell setCurrentStep:([cell currentStep] + 1)];
} else {
[cell setCurrentStep:([cell currentStep] - 1)];
if([cell currentStep] > 0){
removeFlag = NO;
}
}
newRect.size.width = [[_sineCurveWidths objectAtIndex:[cell currentStep]] intValue];
}
} else {
break;
}
newRect.origin.x = xPos;
[cell setFrame:newRect];
if([cell indicator])
[[cell indicator] setFrame:[[control style] indicatorRectForTabCell:cell]];
xPos += newRect.size.width;
}
if(removeFlag){
[_participatingTabBars removeObject:control];
[self removeAllPlaceholdersFromTabBar:control];
}
}
#pragma mark -
#pragma mark Placeholders
- (void)distributePlaceholdersInTabBar:(PSMTabBarControl *)control withDraggedCell:(PSMTabBarCell *)cell
{
// called upon first drag - must distribute placeholders
[self distributePlaceholdersInTabBar:control];
// replace dragged cell with a placeholder, and clean up surrounding cells
int cellIndex = (int)[[control cells] indexOfObject:cell];
PSMTabBarCell *pc = [[PSMTabBarCell alloc] initPlaceholderWithFrame:[[self draggedCell] frame] expanded:YES inControlView:control];
[[control cells] replaceObjectAtIndex:cellIndex withObject:pc];
[[control cells] removeObjectAtIndex:(cellIndex + 1)];
[[control cells] removeObjectAtIndex:(cellIndex - 1)];
return;
}
- (void)distributePlaceholdersInTabBar:(PSMTabBarControl *)control
{
int i, numVisibleTabs = [control numberOfVisibleTabs];
for(i = 0; i < numVisibleTabs; i++){
PSMTabBarCell *pc = [[PSMTabBarCell alloc] initPlaceholderWithFrame:[[self draggedCell] frame] expanded:NO inControlView:control];
[[control cells] insertObject:pc atIndex:(2 * i)];
}
if(numVisibleTabs > 0){
PSMTabBarCell *pc = [[PSMTabBarCell alloc] initPlaceholderWithFrame:[[self draggedCell] frame] expanded:NO inControlView:control];
if([[control cells] count] > (2 * numVisibleTabs)){
[[control cells] insertObject:pc atIndex:(2 * numVisibleTabs)];
} else {
[[control cells] addObject:pc];
}
}
}
- (void)removeAllPlaceholdersFromTabBar:(PSMTabBarControl *)control
{
int i, cellCount = (int)[[control cells] count];
for(i = (cellCount - 1); i >= 0; i--){
PSMTabBarCell *cell = [[control cells] objectAtIndex:i];
if([cell isPlaceholder])
[[control cells] removeObject:cell];
}
// redraw
[[NSRunLoop currentRunLoop] performSelector:@selector(update) target:control argument:nil order:1 modes:[NSArray arrayWithObjects:@"NSEventTrackingRunLoopMode", @"NSDefaultRunLoopMode", nil]];
[[NSRunLoop currentRunLoop] performSelector:@selector(display) target:control argument:nil order:1 modes:[NSArray arrayWithObjects:@"NSEventTrackingRunLoopMode", @"NSDefaultRunLoopMode", nil]];
}
#pragma mark -
#pragma mark Archiving
- (void)encodeWithCoder:(NSCoder *)aCoder {
//[super encodeWithCoder:aCoder];
if ([aCoder allowsKeyedCoding]) {
[aCoder encodeObject:_sourceTabBar forKey:@"sourceTabBar"];
[aCoder encodeObject:_destinationTabBar forKey:@"destinationTabBar"];
[aCoder encodeObject:_participatingTabBars forKey:@"participatingTabBars"];
[aCoder encodeObject:_draggedCell forKey:@"draggedCell"];
[aCoder encodeInt:_draggedCellIndex forKey:@"draggedCellIndex"];
[aCoder encodeBool:_isDragging forKey:@"isDragging"];
[aCoder encodeObject:_animationTimer forKey:@"animationTimer"];
[aCoder encodeObject:_sineCurveWidths forKey:@"sineCurveWidths"];
[aCoder encodePoint:_currentMouseLoc forKey:@"currentMouseLoc"];
[aCoder encodeObject:_targetCell forKey:@"targetCell"];
}
}
- (id)initWithCoder:(NSCoder *)aDecoder {
//self = [super initWithCoder:aDecoder];
//if (self) {
if ([aDecoder allowsKeyedCoding]) {
_sourceTabBar = [aDecoder decodeObjectForKey:@"sourceTabBar"];
_destinationTabBar = [aDecoder decodeObjectForKey:@"destinationTabBar"];
_participatingTabBars = [aDecoder decodeObjectForKey:@"participatingTabBars"];
_draggedCell = [aDecoder decodeObjectForKey:@"draggedCell"];
_draggedCellIndex = [aDecoder decodeIntForKey:@"draggedCellIndex"];
_isDragging = [aDecoder decodeBoolForKey:@"isDragging"];
_animationTimer = [aDecoder decodeObjectForKey:@"animationTimer"];
_sineCurveWidths = [aDecoder decodeObjectForKey:@"sineCurveWidths"];
_currentMouseLoc = [aDecoder decodePointForKey:@"currentMouseLoc"];
_targetCell = [aDecoder decodeObjectForKey:@"targetCell"];
}
//}
return self;
}
@end