PSBrowser.m #1

//
//  PSBrowser.m
//  Perforce
//
//  Created by Adam Czubernat on 18.06.2013.
//  Copyright (c) 2013 Perforce Software, Inc. All rights reserved.
//

#import "PSBrowser.h"

@interface PSBrowser () {
	CGFloat detailViewWidth;
}
- (void)layoutDetailViewAnimated:(BOOL)animated;
- (void)detailViewFrameChange:(NSNotification *)notification;
- (void)lastColumnFrameChange:(NSNotification *)notification;
- (NSTableView *)browserTableViewForColumn:(NSInteger)column;
@end

@implementation PSBrowser
@synthesize detailViewController, columnBackgroundColor;

// Dirty hack
typedef struct __BrcvFlags {
    unsigned int        isEmptyColumn:1;
    unsigned int        hasMarkedWidth:1;
    unsigned int        tileDisabled:1;
    unsigned int        drawsColumnDividerLine:1;
    unsigned int        reserved:28;
} __BrcvFlags;

- (BOOL)sendAction {
	// Remove details pane
	if ([self selectedRowInColumn:[self lastColumn]] == -1 || // When deselected row
		[self selectionIndexPaths].count > 1) // or multiple selection
		[self setDetailViewController:nil];
	return [super sendAction];
}

- (void)loadColumnZero {
	[super loadColumnZero];
	[self setDetailViewController:nil];
}

- (void)addColumn {
	[super addColumn];
	
	// Hack to get column view
	NSTableView *tableView = [self browserTableViewForColumn:self.lastColumn];
	NSClipView *clipView = (id)tableView.superview;
	NSView *columnView = clipView.superview;
	
	// Hack to disable divider line in _NSBrowserColumnView from private api
	__BrcvFlags *flags = PSRuntimeAddressOfInstanceVariable(columnView, "_brcvFlags");
	flags->drawsColumnDividerLine = 0;

	// Set background color
	if (columnBackgroundColor)
		[tableView setBackgroundColor:columnBackgroundColor];
	
	// Remove tableColumn with default indicators
	if ([tableView isKindOfClass:[NSTableView class]] && tableView.tableColumns.count)
		[tableView removeTableColumn:tableView.tableColumns.lastObject];
	
	// Insert separator at the end of columnTableView
	static NSImage *image;
	if (!image) {
		image = [NSImage imageNamed:@"SeparatorVerticalDark.png"];
		image = [image resizableImageWithTopCap:10.0f bottomCap:10.0f];
	}

	CGRect frame = columnView.bounds;
	frame.origin.x = frame.size.width - image.size.width + 2.0f;
	frame.size.width = image.size.width;
	frame.origin.y = -200.0f;	// Size it bigger than scroll
	frame.size.height += 400.0f;
	
	PSView *separator = [[PSView alloc] initWithFrame:frame];
	[separator setAutoresizing:NSViewAutoresizingRightEdge | NSViewAutoresizingVertical];
	[separator setImage:image];
	[clipView addSubview:separator];
}

- (NSRect)frameOfColumn:(NSInteger)column {
	CGRect frame = [super frameOfColumn:column];
	if (column)
		frame.origin.x -= 1.0f; // Remove divider width
	return frame;
}

- (void)setFrame:(NSRect)frameRect {
	[super setFrame:frameRect];
	[self layoutDetailViewAnimated:NO];
}

- (BOOL)ignoreModifierKeysForDraggingSession:(NSDraggingSession *)session {
	return NO;
}

- (void)keyDown:(NSEvent *)event {
	
	unichar keyChar = [[event charactersIgnoringModifiers] characterAtIndex:0];
	NSUInteger flags = [event modifierFlags] & NSDeviceIndependentModifierFlagsMask;

	if (keyChar == ' ' && flags == 0) {
		// Send space bar notification
		[self.nextResponder doCommandBySelector:@selector(toggleQuickLookPreviewPanel:)];
	} else if (keyChar == NSUpArrowFunctionKey || keyChar == NSDownArrowFunctionKey) {
		// Relay Up and Down arrow keys from other views (QuickLook)
		NSView *tableView = [self browserTableViewForColumn:self.selectedColumn];
		[tableView keyDown:event];
	} else {
		[super keyDown:event];
	}
}

- (BOOL)performKeyEquivalent:(NSEvent *)theEvent {
	unichar keyChar = [[theEvent charactersIgnoringModifiers] characterAtIndex:0];
	if (keyChar == 27) {
		[self abortEditing];
		[[self window] makeFirstResponder:self];
		return YES;
	}
	return NO;
}

#pragma mark - Public

- (void)setDetailViewController:(NSViewController *)aDetailViewController {
	
	if (detailViewController == aDetailViewController)
		return;
	
	[[NSNotificationCenter defaultCenter]
	 removeObserver:self name:NSViewFrameDidChangeNotification object:nil];

	[detailViewController.view removeFromSuperview];
	detailViewController = aDetailViewController;
	
	detailViewWidth = detailViewController.view.frame.size.width;
	
	if (detailViewController) {

		NSArray *columns = [self valueForKey:@"_columns"];
		NSView *lastColumn = [columns objectAtIndex:self.lastColumn];

		NSView *view = detailViewController.view;
		[view setAutoresizing:NSViewAutoresizingLeftEdge | NSViewAutoresizingVertical];
		
		[lastColumn.superview addSubview:view];
		
		[self layoutDetailViewAnimated:YES];
		
		[[NSNotificationCenter defaultCenter]
		 addObserver:self selector:@selector(detailViewFrameChange:)
		 name:NSViewFrameDidChangeNotification object:view];

		[[NSNotificationCenter defaultCenter]
		 addObserver:self selector:@selector(lastColumnFrameChange:)
		 name:NSViewFrameDidChangeNotification object:lastColumn];
	}
}

- (NSInteger)columnOfItem:(id)item {
	NSAssert(![self isLeafItem:item], @"Getting column for leaf item");
	for (NSInteger column = 0; column <= [self lastColumn]; column++)
		if ([self parentForItemsInColumn:column] == item)
			return column;
	return -1;
}

#pragma mark - Private

- (void)layoutDetailViewAnimated:(BOOL)animated {
	
	if (!detailViewController)
		return;

	NSView *detailView = detailViewController.view;
	NSArray *columns = [self valueForKey:@"_columns"];
	NSView *lastColumn = [columns objectAtIndex:self.lastColumn];
	NSView *columnContainer = [lastColumn superview];
	NSScrollView *scrollView = self.subviews.firstObject;
	NSClipView *contentView = [scrollView contentView];
	
	CGRect frame = lastColumn.frame;
	frame.origin.x += frame.size.width;
	frame.size.width = detailView.bounds.size.width;
	detailView.frame = frame;
	
	if ([self inLiveResize]) {
		frame = columnContainer.frame;
		frame.size.width = CGRectGetMaxX(detailView.frame);
		columnContainer.frame = frame;
		return;
	}
	
	frame = columnContainer.frame;
	CGFloat oldWidth = frame.size.width;
	CGFloat newWidth = CGRectGetMaxX(detailView.frame);

	if (oldWidth == newWidth)
		return;

	void (^animation)() = ^{ };
	frame.size.width = newWidth;
	
	if (oldWidth < newWidth) {
		
		CGPoint boundsOrigin = contentView.bounds.origin;
		columnContainer.frame = frame;
		CGRect bounds = contentView.bounds;
		bounds.origin = boundsOrigin;
		[contentView setBounds:bounds];
		
		CGPoint point = detailView.frame.origin;
		point.x -= self.bounds.size.width - detailView.bounds.size.width;
		point.x = fmax(point.x, 0.0f);
		
		animation = ^{
			[(animated ? [contentView animator] : contentView) setBoundsOrigin:point];
			[scrollView reflectScrolledClipView:contentView];
		};
	}
	
	if (animated)
		[NSView animateWithDuration:0.1f animations:animation];
	else
		animation();
}

- (void)detailViewFrameChange:(NSNotification *)notification {
	CGFloat newDetailViewWidth = detailViewController.view.frame.size.width;
	if (detailViewWidth != newDetailViewWidth) {
		[self layoutDetailViewAnimated:YES];
		detailViewWidth = newDetailViewWidth;
	}
}

- (void)lastColumnFrameChange:(NSNotification *)notification {
	[self layoutDetailViewAnimated:NO];
	[self performSelector:@selector(layoutDetailViewAnimated:) withObject:@(YES) afterDelay:0];
}

- (NSTableView *)browserTableViewForColumn:(NSInteger)column {
	if (column < 0)
		return nil;
	
	// Hack to get column views
	NSArray *columns = [self valueForKey:@"_columns"];
	NSView *columnView = [columns objectAtIndex:column];
	
	// Retrieve NSBrowserTableView from subviews
	NSClipView *clipView = nil;
	NSTableView *tableView = nil;
	for (NSView *subview in columnView.subviews) {
		if ([subview isKindOfClass:[NSClipView class]])
			clipView = (id)subview;
	}
	for (NSView *subview in clipView.subviews) {
		if ([subview isKindOfClass:NSClassFromString(@"NSBrowserTableView")])
			tableView = (id)subview;
	}
	return tableView;
}

@end