@Hipreme @Graphics and Games Engineer @m0zrat
I have some actual working code -- and wanted to share. I extended MTK::View with some Objective-c code (objcpp), and wrote an adapter.
@Graphics and Games Engineer -- I first tried to use NSNotificationCenter to get a Notification of a GCKeyboard connection, and by assigning an objective-c block to keyChangedHandler; for whatever the reason, I could not get the notifcation center to propagate the NSNotification properly, so I gave up on this.
@m0zrat Then, I read some documentation on basic event handling that I would recommend anyone who comes across this thread to read:
basic event handling in objective-c
key events in objective-c
Finally, working code here -->
First define a .hpp header, call it something like ViewAdapter.hpp
namespace Explorer {
class ViewAdapter {
public:
virtual MTK::View* get(CGRect frame);
virtual void printDebug();
};
}; // namespace Explorer
Then, declare an objective-c interface for your objcpp code.
/**
* 1) ViewAdapter -> ViewExtender (C++ -> Obj-C)
* 2) ViewAdapter -> returns extension of MTK::View. (Obj-C -> C++)
**/
@interface ViewExtender : MTKView {
}
+ (void)load:(CGRect)frame;
+ (ViewExtender *)get;
- (void)printDebug;
@end
Now it's time to implement both in the same file. You can mix objective-c code with c++ code by using the .mm extension.
So your file should be called something like ViewExtender.mm
ViewExtender *adapter;
MTK::View *Explorer::ViewAdapter::get(CGRect frame) {
[ViewExtender load: frame];
return (__bridge MTK::View *)[ViewExtender get];
}
void Explorer::ViewAdapter::printDebug() {
ViewExtender *ref = [ViewExtender get];
[ref printDebug];
}
@implementation ViewExtender
+ (void)load:(CGRect)frame {
NSLog(@"Loading Objective-c ViewAdapter ...");
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
adapter = [[self alloc] initWithFrame:frame];
[adapter init];
[pool release];
}
+ (ViewExtender *)get {
return adapter;
}
- (id)init {
BOOL isFirstResponder = [self becomeFirstResponder];
NSLog(@"Is first responder: %@", isFirstResponder ? @"Yes" : @"No");
return self;
}
// Needs to be overwritten to accept keyboard events.
// Learn more here:
// https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/EventOverview/EventHandlingBasics/EventHandlingBasics.html#//apple_ref/doc/uid/10000060i-CH5
- (BOOL)acceptsFirstResponder {
return YES;
}
- (void)keyDown:(NSEvent *)event {
NSLog(@"Detected a key down event.");
[event type];
}
- (void)printDebug {
NSLog(@"ViewAdapter debug info ...");
}
@end
This on its own will return to you a MTK::View* object, you still need to set the device by using MTK::View::setDevice(...).
But now once your view is open, you should see once you type, a logging message should appear: 'Detected a key down event.'
Let me know if this works for you!
Topic:
Graphics & Games
SubTopic:
General
Tags: