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/* Implementation of class NSColorSampler
Copyright (C) 2019 Free Software Foundation, Inc.
By: Gregory John Casamento
Date: Thu Mar 12 03:11:27 EDT 2020
This file is part of the GNUstep Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110 USA.
*/
#import <Foundation/NSGeometry.h>
#import <Foundation/NSDate.h>
#import <Foundation/NSException.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSLock.h>
#import <AppKit/NSApplication.h>
#import <AppKit/NSBitmapImageRep.h>
#import <AppKit/NSColorSampler.h>
#import <AppKit/NSCursor.h>
#import <AppKit/NSColor.h>
#import <AppKit/NSEvent.h>
#import <AppKit/NSImage.h>
#import <AppKit/NSScreen.h>
#import <AppKit/NSPanel.h>
#import <GNUstepGUI/GSDisplayServer.h>
static NSLock *_gs_gui_color_sampler_lock = nil;
static NSColorSampler *_gs_gui_color_sampler = nil;
@interface NSWindow (private)
- (void) _captureMouse: sender;
- (void) _releaseMouse: sender;
@end
@implementation NSColorSampler
+ (void) initialize
{
if (self == [NSColorSampler class])
{
// Initial version
[self setVersion: 1];
_gs_gui_color_sampler_lock = [NSLock new];
}
}
- (instancetype) init
{
if (_gs_gui_color_sampler == nil)
{
_gs_gui_color_sampler = self;
}
if (self != _gs_gui_color_sampler)
{
RELEASE(self);
return _gs_gui_color_sampler;
}
return self;
}
- (void) showSamplerWithSelectionHandler: (GSColorSampleHandler)selectionHandler
{
NSEvent *currentEvent;
NSCursor *cursor;
NSRect contentRect = NSMakeRect(-1024,-1024,0,0);
unsigned int style = NSTitledWindowMask | NSClosableWindowMask
| NSResizableWindowMask | NSUtilityWindowMask;
NSPanel *w = nil;
NSColor *color = nil;
[_gs_gui_color_sampler_lock lock];
w = [[NSPanel alloc] initWithContentRect: contentRect
styleMask: style
backing: NSBackingStoreRetained
defer: NO
screen: nil];
[w setBecomesKeyOnlyIfNeeded: YES];
[w makeKeyAndOrderFront: self];
[w _captureMouse: self];
/**
* There was code here to dynamically generate a magnifying glass
* cursor with a magnified portion of the screenshot in it,
* but changing the cursor rapidly on X seems to cause flicker,
* so we just use a plain magnifying glass. (dynamic code is in r33543)
*/
cursor = [[NSCursor alloc] initWithImage: [NSImage imageNamed: @"MagnifyGlass"]
hotSpot: NSMakePoint(12, 13)];
AUTORELEASE(cursor);
[cursor push];
NS_DURING
{
do
{
NSPoint mouseLoc;
NSImage *img;
CREATE_AUTORELEASE_POOL(pool);
RELEASE(color);
currentEvent = [NSApp nextEventMatchingMask: NSLeftMouseDownMask | NSLeftMouseUpMask | NSMouseMovedMask
untilDate: [NSDate distantFuture]
inMode: NSEventTrackingRunLoopMode
dequeue: YES];
mouseLoc = [w convertBaseToScreen: [w mouseLocationOutsideOfEventStream]];
img = [GSCurrentServer() contentsOfScreen: [[w screen] screenNumber]
inRect: NSMakeRect(mouseLoc.x, mouseLoc.y, 1, 1)];
if (nil != img)
{
NSBitmapImageRep *rep = (NSBitmapImageRep *)[img bestRepresentationForDevice: nil];
color = [rep colorAtX: 0 y: 0];
RETAIN(color);
}
[pool drain];
} while ([currentEvent type] != NSLeftMouseUp &&
[currentEvent type] != NSLeftMouseDown);
}
NS_HANDLER
{
NSLog(@"Exception occurred in -[NSColorSampler showSamplerWithSelectionHandler:] : %@",
localException);
}
NS_ENDHANDLER;
CALL_BLOCK(selectionHandler, color);
RELEASE(color);
[NSCursor pop];
[w _releaseMouse: self];
[w close];
[_gs_gui_color_sampler_lock unlock];
}
@end
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