source: trunk/PrefsPane/src/FilterListView.m @ 1046

/* Copyright (C) 2008-2009 Peter Speck
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#import "FilterListView.h"
#import "FilterTabController.h"
#import "Prefs.h"
#import "Filter.h"
#import "ServerCommunication.h"
#import "Xml.h"
#import "FilterRuleTableView.h"

#ifdef DEBUG
//#define DEBUG_DD
#endif

@interface FilterListDropView : NSView
{
    NSColor* _color;
}

- (id)initWithFrame:(NSRect)frameRect;
- (void)dealloc;
- (void)drawRect:(NSRect)r;

@end

@implementation FilterListDropView

- (id)initWithFrame:(NSRect)frameRect
{
    if (!(self = [super initWithFrame:frameRect]))
        return nil;
    _color = [[NSColor colorWithDeviceRed:0.23f green:0.33f blue:0.85f alpha:1] retain];
    return self;
}

- (void)dealloc
{
    [_color release];
    [super dealloc];
}

- (void)drawRect:(NSRect)r
{
    [super drawRect:r];
    [_color set];
    NSRectFill(r);
}

@end

@interface FilterListView()

- (void)releaseDragInfo;

@end


@implementation FilterListView

- (id)initWithFrame:(NSRect)frameRect
{
    if (!(self = [super initWithFrame:frameRect]))
        return nil;
    [self registerForDraggedTypes:[NSArray arrayWithObject:[Filter draggingDataType]]];
    return self;
}

- (void)dealloc
{
    [self releaseDragInfo];
    [self setController:NULL];
    [super dealloc];
}

- (void)setController:(FilterTabController*)controller
{
    [_controller release];
    _controller = [controller retain];
    [_prefs release];
    _prefs = [[controller prefs] retain];
}

- (void)zapDropViewFrame
{
    if (!_dropDestinationView)
        return;
#ifdef DEBUG_DD
    NSLog(@"Zaps _dropDestinationView");
#endif
    [_dropDestinationView removeFromSuperview];
    [_dropDestinationView release];
    _dropDestinationView = NULL;
}

- (NSPoint)findDropDestinationFilter:(NSPoint)mousePos withDestinationIndex:(NSUInteger*)dstIndex
{
    if (dstIndex)
        *dstIndex = NSNotFound;
    NSArray* rows = [self rows];
    NSInteger num = [rows count];
    for (int i = 0; i < num; i++) {
        Filter* filter = [rows objectAtIndex:i];
        NSRect r = [filter frame];
        if (mousePos.y > r.origin.y + r.size.height && i != num - 1) // always accept pos below last item in list.
            continue;
        CGFloat y = r.origin.y - 1;
        if (mousePos.y > r.origin.y + r.size.height / 2) {
            y += r.size.height;
            i++;
        } else {
            if (i == 0)
                y += 1;
        }
        if (NO) {
            NSLog(@"dst mp = %.0f, idx = %d, r = %.0f to %.0f to %.0f -> %ld",
                  mousePos.y, i, r.origin.y,
                  r.origin.y + r.size.height / 2, r.origin.y + r.size.height,
                  (long)(dstIndex ? *dstIndex : 66666));
        }
        if (dstIndex)
            *dstIndex = i;
        return NSMakePoint(0, y);
    }
    return NSMakePoint(-1, -1);
}

- (NSDragOperation)setDropViewFrame:(NSPoint)pos
{
    pos = [self findDropDestinationFilter:pos withDestinationIndex:NULL];
    if (pos.x < 0) {
        [self zapDropViewFrame];
        return NSDragOperationNone;
    }
    if (_dropDestinationView) {
        [_dropDestinationView setFrameOrigin:pos];
    } else {
        NSRect r = NSMakeRect(0, pos.y, [self frame].size.width, 2);
#ifdef DEBUG_DD
        NSLog(@"Creates _dropDestinationView: %@", NSStringFromRect(r));
#endif
        _dropDestinationView = [[FilterListDropView alloc] initWithFrame:r];
        [self addSubview:_dropDestinationView positioned:NSWindowAbove relativeTo:NULL];
    }
    return NSDragOperationMove;
}

- (void)releaseDragInfo
{
    [self zapDropViewFrame];
    [_srcFilter release];
    _srcFilter = NULL;
}

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
{
    NSPasteboard* pboard = [sender draggingPasteboard];
#ifdef DEBUG_DD
    NSLog(@"draggingEntered: %@", [pboard types]);
#endif
    if (![[pboard types] containsObject:[Filter draggingDataType]])
        return NSDragOperationNone;
    NSPoint pos = [self convertPointFromBase:[sender draggingLocation]];
    return [self setDropViewFrame:pos];
}

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
#ifdef DEBUG_DD
    NSLog(@"performDragOperation: %@", sender);
#endif
    NSPoint draggingLocationLocal = [self convertPointFromBase:[sender draggingLocation]];
    NSUInteger srcIndex = [[self rows] indexOfObject:_srcFilter];
    NSUInteger dstIndex = NSNotFound;
    [self findDropDestinationFilter:draggingLocationLocal withDestinationIndex:&dstIndex];
#ifdef DEBUG_DD
    NSLog(@"index: %d -> %d", srcIndex, dstIndex);
#endif
    if (dstIndex == NSNotFound || srcIndex == NSNotFound || dstIndex == srcIndex || dstIndex == srcIndex + 1) {
        [self releaseDragInfo];
        return NO;
    }
    ServerCommunication* comm = [_srcFilter comm];
    [_srcFilter retain];
    [self removeRow:_srcFilter];
    [self addRow:_srcFilter atIndex:dstIndex - (dstIndex > srcIndex)];
    [_srcFilter release];
    [self releaseDragInfo];
    NSMutableArray* a = [NSMutableArray arrayWithCapacity:10];
    for (Filter* filter in [self rows])
        [a addObject:[filter filterE]];
    [Xml reorderChilds:a];
    [_prefs markAsDirty];
    [comm saveDirtyPrefsAndNotify];
    return YES;
}

- (BOOL)prepareForDragOperation:(id < NSDraggingInfo >)sender
{
#ifdef DEBUG_DD
    NSLog(@"prepareForDragOperation: %@", sender);
#endif
    return YES;
}

- (NSDragOperation)draggingUpdated:(id < NSDraggingInfo >)sender
{
#ifdef DEBUG_DD
//  NSLog(@"draggingUpdated: %@", sender);
#endif
    NSPoint pos = [self convertPointFromBase:[sender draggingLocation]];
    return [self setDropViewFrame:pos];
}

- (void)draggingExited:(id < NSDraggingInfo >)sender
{
#ifdef DEBUG_DD
    NSLog(@"draggingUpdated: %@", sender);
#endif
    [self zapDropViewFrame];
}

- (void)startDrag:(Filter*)filter withImage:(NSImage*)image withEvent:(NSEvent*)event
{
    [self releaseDragInfo];
    _srcFilter = [filter retain];
    NSPasteboard *pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
    [pboard declareTypes:[NSArray arrayWithObject:[Filter draggingDataType]] owner:self];
    NSString* s = [NSString stringWithFormat:@"%d", [filter filterId]];
    NSData* data = [s dataUsingEncoding:NSUTF8StringEncoding];
    [pboard setData:data forType:[Filter draggingDataType]];
    NSPoint dragPoint = [filter convertPoint:NSMakePoint(0, 0) toView:self];
    [NSApp preventWindowOrdering];
    [self dragImage:image
                 at:dragPoint
             offset:NSMakeSize(0, 0)
              event:event
         pasteboard:pboard
             source:self
          slideBack:YES];
}

- (void)draggedImage:(NSImage*)anImage endedAt:(NSPoint)aPoint operation:(NSDragOperation)operation
{
#ifdef DEBUG_DD
    NSLog(@"draggedImage:endedAt = %d", operation);
#endif
    [self releaseDragInfo];
}

#pragma mark ------------------- Paste of rules

- (BOOL)validateMenuItem:(NSMenuItem*)item
{
    if ([item action] != @selector(paste:))
        return [super validateMenuItem:item];
    return [[_controller rulesTableView] validateMenuItem:item];
}

- (void)paste:(id)sender
{
    [[_controller rulesTableView] paste:sender];
}

@end