So I have this program that displays events on the window using NSWindow and a NSTextField. Basically it tracks the mouse position and the keyboard state.
I created a simple class named MyEventWindow:
//
// MyEventWindow.h
// AppTest
#ifndef MyEventWindow_h
#define MyEventWindow_h
@interface MyEventWindow : NSWindow
{
}
@property(nonatomic, strong) NSTextField* label;
@property(nonatomic, strong) NSString* labelText;
- (BOOL)windowShouldClose:(id)sender;
- (instancetype) init;
- (void) setLabelText:(NSString *)labelText;
@end
@implementation MyEventWindow
-(instancetype) init
{
self = [super initWithContentRect:NSMakeRect(100, 100, 300, 300)
styleMask:(NSWindowStyleMaskTitled | NSWindowStyleMaskClosable | NSWindowStyleMaskMiniaturizable | NSWindowStyleMaskResizable)
backing:NSBackingStoreBuffered
defer:NO];
if( !self )
{
return nil;
}
[self setTitle: @"Event tracker"];
[self setIsVisible: YES];
_label = [[NSTextField alloc] initWithFrame:NSMakeRect(5, 100, 290, 100)];
[_label setBezeled: NO];
[_label setDrawsBackground: NO];
[_label setEditable: NO];
[_label setSelectable: YES];
NSFont *currentFont = [_label font];
NSFont *resizedFont = [NSFont fontWithName:[currentFont fontName] size:18];
NSFont *boldFont = [[NSFontManager sharedFontManager] convertFont:resizedFont toHaveTrait:NSFontBoldTrait];
// convert the bold font to have the italic trait
NSFont *boldItalicFont = [[NSFontManager sharedFontManager] convertFont:boldFont toHaveTrait:NSFontItalicTrait];
[_label setFont:boldItalicFont];
[_label setTextColor:[NSColor colorWithSRGBRed:0.0 green:0.5 blue:0.0 alpha:1.0]];
// attach label to the damn window
[[self contentView] addSubview: _label];
return self;
}
-(BOOL)windowShouldClose:(id)sender
{
return YES;
}
-(void) setLabelText:(NSString *)newText
{
[_label setStringValue: newText];
}
@end
#endif /* MyEventWindow_h */
Then in the main file I try to handle event loop manually:
//
// main.m
#import <Cocoa/Cocoa.h>
#import "MyEventWindow.h"
NSString* NSEventTypeToNSString(NSEventType eventType);
NSString* NSEventModifierFlagsToNSString(NSEventModifierFlags modifierFlags);
int main(int argc, char* argv[])
{
@autoreleasepool
{
[NSApplication sharedApplication];
MyEventWindow* eventWindow = [[MyEventWindow alloc] init];
[eventWindow makeKeyAndOrderFront:nil];
NSString* log = [NSString string];
// my own message loop
[NSApp finishLaunching];
while (true)
{
@autoreleasepool
{
NSEvent* event = [NSApp nextEventMatchingMask:NSEventMaskAny untilDate: [NSDate distantFuture] inMode:NSDefaultRunLoopMode dequeue:YES];
log = [NSString stringWithFormat:@"Event [type=%@ location={%d, %d} modifierFlags={%@}]", NSEventTypeToNSString([event type]), (int)[event locationInWindow].x, (int)[event locationInWindow].y, NSEventModifierFlagsToNSString([event modifierFlags])];
//NSLog(@"log: %@", log);
[eventWindow setLabelText: log];
[NSApp sendEvent:event];
//[NSApp updateWindows]; // redundant?
}
}
}
return 0;
}
NSString* NSEventTypeToNSString(NSEventType eventType)
{
switch (eventType)
{
case NSEventTypeLeftMouseDown: return @"LeftMouseDown";
case NSEventTypeLeftMouseUp: return @"LeftMouseUp";
case NSEventTypeRightMouseDown: return @"RightMouseDown";
case NSEventTypeRightMouseUp: return @"RightMouseUp";
case NSEventTypeMouseMoved: return @"MouseMoved";
case NSEventTypeLeftMouseDragged: return @"LeftMouseDragged";
case NSEventTypeRightMouseDragged: return @"RightMouseDragged";
case NSEventTypeMouseEntered: return @"MouseEntered";
case NSEventTypeMouseExited: return @"MouseExited";
case NSEventTypeKeyDown: return @"KeyDown";
case NSEventTypeKeyUp: return @"KeyUp";
case NSEventTypeFlagsChanged: return @"FlagsChanged";
case NSEventTypeAppKitDefined: return @"AppKitDefined";
case NSEventTypeSystemDefined: return @"SystemDefined";
case NSEventTypeApplicationDefined: return @"ApplicationDefined";
case NSEventTypePeriodic: return @"Periodic";
case NSEventTypeCursorUpdate: return @"CursorUpdate";
case NSEventTypeScrollWheel: return @"ScrollWheel";
case NSEventTypeTabletPoint: return @"TabletPoint";
case NSEventTypeTabletProximity: return @"TabletProximity";
case NSEventTypeOtherMouseDown: return @"OtherMouseDown";
case NSEventTypeOtherMouseUp: return @"OtherMouseUp";
case NSEventTypeOtherMouseDragged: return @"OtherMouseDragged";
default:
return [NSString stringWithFormat:@"%lu", eventType];
}
}
NSString* NSEventModifierFlagsToNSString(NSEventModifierFlags modifierFlags)
{
NSString* result = @"";
if ((modifierFlags & NSEventModifierFlagCapsLock) == NSEventModifierFlagCapsLock)
result = [result stringByAppendingString:@"CapsLock, "];
if ((modifierFlags & NSEventModifierFlagShift) == NSEventModifierFlagShift)
result = [result stringByAppendingString:@"NShift, "];
if ((modifierFlags & NSEventModifierFlagControl) == NSEventModifierFlagControl)
result = [result stringByAppendingString:@"Control, "];
if ((modifierFlags & NSEventModifierFlagOption) == NSEventModifierFlagOption)
result = [result stringByAppendingString:@"Option, "];
if ((modifierFlags & NSEventModifierFlagCommand) == NSEventModifierFlagCommand)
result = [result stringByAppendingString:@"Command, "];
if ((modifierFlags & NSEventModifierFlagNumericPad) == NSEventModifierFlagNumericPad)
result = [result stringByAppendingString:@"NumericPad, "];
if ((modifierFlags & NSEventModifierFlagHelp) == NSEventModifierFlagHelp)
result = [result stringByAppendingString:@"Help, "];
if ((modifierFlags & NSEventModifierFlagFunction) == NSEventModifierFlagFunction)
result = [result stringByAppendingString:@"Function, "];
return result;
}
in main I added a second @autoreleasepool inside the while loop it seemed to decrease memory usage significanly, however if I keep moving my mouse a lot the memory usage will still increase.
I don't think this should be happening since the labelText is being destroying and recreated each iteration, is something wrong with my code? Why do I have a memory leak here?
Any feedback regarding the code is also appreciated
Cheers