DYCreeveyBrowser.m

//Copyright 2005-2023 Dominic Yu. Some rights reserved.
//This work is licensed under the Creative Commons
//Attribution-NonCommercial-ShareAlike License. To view a copy of this
//license, visit http://creativecommons.org/licenses/by-nc-sa/2.0/ or send
//a letter to Creative Commons, 559 Nathan Abbott Way, Stanford,
//California 94305, USA.

#import "DYCreeveyBrowser.h"
#import "CreeveyMainWindowController.h"

@interface DYBrowserCell : NSBrowserCell {
	NSString *title;
}
// maintains a title for display (sep. from stringValue), and draws it
@end

@implementation DYBrowserCell

- (void)setTitle:(NSString *)s {
	if (s == title) return;
	title = [s copy];
}
- (NSString *)title {
	return title;
}

- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
	NSString *myStringValue = self.stringValue;
	self.stringValue = title ?: @"";
	[super drawInteriorWithFrame:cellFrame inView:controlView];
	self.stringValue = myStringValue;
}

@end

@interface DYCreeveyBrowserMatrix : NSMatrix
@end
@implementation DYCreeveyBrowserMatrix
- (BOOL)validateMenuItem:(NSMenuItem *)menuItem {
	if (menuItem.action == @selector(selectAll:)) return YES;
	return [super validateMenuItem:menuItem];
}
- (void)selectAll:(id)sender {
	[(CreeveyMainWindowController *)self.window.delegate selectAll:sender]; // to pass it to image matrix
}
- (void)keyDown:(NSEvent *)e {
	unichar c = 0;
	if (e.characters.length == 1)
		c = [e.characters characterAtIndex:0];
	if (c == NSPageUpFunctionKey || c == NSPageDownFunctionKey)
		if (self.frame.size.height > self.superview.frame.size.height)
			[self.superview keyDown:e]; // scroll ourselves
		else
			[(CreeveyMainWindowController *)self.window.delegate fakeKeyDown:e]; // scroll img matrix
	else
		[super keyDown:e];
}
@end

// for drag-n-drop visual feedback
@interface DYTransparentGreyView : NSView
@end
@implementation DYTransparentGreyView
- (void)drawRect:(NSRect)rect {
	[[NSColor.lightGrayColor colorWithAlphaComponent:0.5] set];
	[NSBezierPath fillRect:rect];
}
@end

@implementation DYCreeveyBrowser
{
	NSMutableString *typedString;
	NSTimeInterval lastKeyTime;
	DYTransparentGreyView *greyview; // for drag-and-drop
}
@dynamic delegate; // use super.delegate

- (instancetype)initWithFrame:(NSRect)frameRect {
	if (self = [super initWithFrame:frameRect]) {
// I don't think there's an easy way to catch events/messages to first responder without using a custom matrix class
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
		[self setMatrixClass:[DYCreeveyBrowserMatrix class]];
#pragma GCC diagnostic pop
		self.titled = NO;
		self.hasHorizontalScroller = YES;
		[self setCellClass:[DYBrowserCell class]];
		[self.cellPrototype setFont:[NSFont systemFontOfSize:NSFont.smallSystemFontSize-1]];
		self.allowsEmptySelection = NO;
		self.columnResizingType = NSBrowserUserColumnResizing;
		self.prefersAllColumnUserResizing = NO;
		
		typedString = [[NSMutableString alloc] init];
		[self registerForDraggedTypes:@[NSFilenamesPboardType]];
		greyview = [[DYTransparentGreyView alloc] initWithFrame:NSZeroRect];
	}
	return self;
}

#define KEYPRESS_INTERVAL 0.5

- (void)keyDown:(NSEvent *)e {
	unichar c = 0;
	if (e.characters.length == 1)
		c = [e.characters characterAtIndex:0];
	if ((c >= 0xF700 && c <= 0xF8FF) || [[NSCharacterSet controlCharacterSet] characterIsMember:c] || [[NSCharacterSet newlineCharacterSet] characterIsMember:c]) {
		// NSPageUpFunctionKey, NSPageDownFunctionKey, arrow keys, etc.
		[typedString setString:@""];
		[super keyDown:e];
		return;
	}
	[self interpretKeyEvents:@[e]];
	return;
}

- (void)insertText:(id)insertString {
	NSString *s = insertString;
	NSTimeInterval t = NSDate.timeIntervalSinceReferenceDate;
	if (t - lastKeyTime < KEYPRESS_INTERVAL)
		[typedString appendString:s];
	else
		[typedString setString:s];
	lastKeyTime = t;
	
	[self.delegate browser:self typedString:typedString inColumn:self.selectedColumn];
}

- (BOOL)sendAction {
	[self.delegate browserWillSendAction:self];
	return [super sendAction];
}

#pragma mark dragging stuff
- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender {
    if ([sender.draggingPasteboard.types containsObject:NSFilenamesPboardType]) {
        if (sender.draggingSourceOperationMask & NSDragOperationGeneric) {
			greyview.frame = self.bounds;
			[self addSubview:greyview];
            return NSDragOperationGeneric;
        }
    }
    return NSDragOperationNone;
}

- (BOOL)wantsPeriodicDraggingUpdates {
	return NO;
}

- (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender
{
	if (sender.draggingSourceOperationMask & NSDragOperationGeneric) {
		return NSDragOperationGeneric;
	}
	return NSDragOperationNone;
}

- (void)draggingExited:(id <NSDraggingInfo>)sender {
	[greyview removeFromSuperview];
}

- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender {
	[greyview removeFromSuperview];
	return YES;
}

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender {
    NSPasteboard *pboard;
    NSDragOperation sourceDragMask;
    sourceDragMask = sender.draggingSourceOperationMask;
    pboard = sender.draggingPasteboard;
    if ( [pboard.types containsObject:NSFilenamesPboardType] ) {
        NSArray *files = [pboard propertyListForType:NSFilenamesPboardType];
        if (sourceDragMask & NSDragOperationGeneric)
            [(CreeveyMainWindowController *)self.window.delegate openFiles:files withSlideshow:NO];
    }
    return YES;
}

@end