cocos_lib/cocos/platform/mac/View.mm

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 Copyright (c) 2020-2022 Xiamen Yaji Software Co., Ltd.

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#import "View.h"
#import <AppKit/NSEvent.h>
#import <AppKit/NSScreen.h>
#import <AppKit/NSTouch.h>
#import <QuartzCore/QuartzCore.h>
#import "KeyCodeHelper.h"
#import "application/ApplicationManager.h"
#import "cocos/bindings/event/EventDispatcher.h"
#import "platform/mac/AppDelegate.h"
#import "platform/mac/modules/SystemWindow.h"
#import "platform/mac/modules/SystemWindowManager.h"

#include "SDL2/SDL.h"

static int MetalViewEventWatch(void* userData, SDL_Event*event) {
    if (event->type == SDL_WINDOWEVENT && event->window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
        @autoreleasepool {
            auto *view = (__bridge View *)userData;
            if ([view getWindowId] == event->window.windowID) {
                [view viewDidChangeBackingProperties];
            }
        }
    }
    return 0;
}

@implementation View {
    cc::MouseEvent _mouseEvent;
    cc::KeyboardEvent _keyboardEvent;
}

- (CALayer *)makeBackingLayer {
    CAMetalLayer *layer = [CAMetalLayer layer];
    layer.delegate = self;
    layer.autoresizingMask = true;
    layer.needsDisplayOnBoundsChange = true;
    return layer;
}

- (instancetype)initWithFrame:(NSRect)frameRect {
    if (self = [super initWithFrame:frameRect]) {
        // View is used as a subview, so the resize message needs to be handled manually.
        SDL_AddEventWatch(MetalViewEventWatch, (__bridge void*)(self));
        [self.window makeFirstResponder:self];
        int pixelRatio = [[NSScreen mainScreen] backingScaleFactor];
        CGSize size = CGSizeMake(frameRect.size.width * pixelRatio, frameRect.size.height * pixelRatio);
        // Create CAMetalLayer
        self.wantsLayer = YES;
        // Config metal layer
        CAMetalLayer *layer = (CAMetalLayer *)self.layer;
        layer.drawableSize = size;
        layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
        layer.device = self.device = [MTLCreateSystemDefaultDevice() autorelease];
        layer.autoresizingMask = kCALayerWidthSizable | kCALayerHeightSizable;
        self.layerContentsRedrawPolicy = NSViewLayerContentsRedrawDuringViewResize;
        self.layerContentsPlacement = NSViewLayerContentsPlacementScaleProportionallyToFill;

        // Add tracking area to receive mouse move events.
        NSRect rect = {0, 0, size.width, size.height};
        NSTrackingArea *trackingArea = [[[NSTrackingArea alloc] initWithRect:rect
                                                                     options:(NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved | NSTrackingActiveInKeyWindow | NSTrackingInVisibleRect)
                                                                       owner:self
                                                                    userInfo:nil] autorelease];
        [self addTrackingArea:trackingArea];
    }
    return self;
}

- (void)drawInMTKView:(MTKView *)view {
    //cc::Application::getInstance()->tick();
}

- (void)mtkView:(nonnull MTKView *)view drawableSizeWillChange:(CGSize)size {
    cc::WindowEvent ev;
    ev.windowId = [self getWindowId];
    ev.type = cc::WindowEvent::Type::RESIZED;
    ev.width = static_cast<int>(size.width);
    ev.height = static_cast<int>(size.height);
    cc::events::WindowEvent::broadcast(ev);
}

- (void)displayLayer:(CALayer *)layer {
    //cc::Application::getInstance()->tick();
}

- (void)setFrameSize:(NSSize)newSize {
    CAMetalLayer *layer = (CAMetalLayer *)self.layer;

    CGSize nativeSize = [self convertSizeToBacking:newSize];
    [super setFrameSize:newSize];
    layer.drawableSize = nativeSize;
}

- (void)viewDidChangeBackingProperties {
    [super viewDidChangeBackingProperties];
    CAMetalLayer *layer = (CAMetalLayer *)self.layer;
    layer.contentsScale = self.window.backingScaleFactor;
    auto size = [[self.window contentView] frame].size;
    auto width = size.width * self.window.backingScaleFactor;
    auto height = size.height * self.window.backingScaleFactor;

    if (width > 0 && height > 0) {
        [super setFrameSize:size];
        layer.drawableSize = CGSizeMake(width, height);
    }
}

- (void)flagsChanged:(NSEvent *)event {
    int keyCode = translateKeycode(event.keyCode);
    updateModifierKeyState(keyCode);
    auto action = getModifierKeyAction(keyCode);

    // NOTE: in some cases, flagsChanged event may return some wrong keyCodes
    // For example:
    // - when you long press the capslock key, you may get the keyCode -1
    // - when you press ctrl + space, you may get the keyCode 65
    if (action == cc::KeyboardEvent::Action::UNKNOWN) {
        return;
    }
    _keyboardEvent.windowId = [self getWindowId];
    _keyboardEvent.key = keyCode;
    _keyboardEvent.action = action;
    [self setModifierFlags:event];
    cc::events::Keyboard::broadcast(_keyboardEvent);
}

- (void)setModifierFlags:(NSEvent *)event {
    NSEventModifierFlags modifierFlags = event.modifierFlags;
    if (modifierFlags & NSEventModifierFlagShift)
        _keyboardEvent.shiftKeyActive = true;
    else
        _keyboardEvent.shiftKeyActive = false;

    if (modifierFlags & NSEventModifierFlagControl)
        _keyboardEvent.ctrlKeyActive = true;
    else
        _keyboardEvent.ctrlKeyActive = false;

    if (modifierFlags & NSEventModifierFlagOption)
        _keyboardEvent.altKeyActive = true;
    else
        _keyboardEvent.altKeyActive = false;

    if (modifierFlags & NSEventModifierFlagCommand)
        _keyboardEvent.metaKeyActive = true;
    else
        _keyboardEvent.metaKeyActive = false;
}

- (BOOL)acceptsFirstResponder {
    return YES;
}

- (int)getWindowId {
    auto *windowMgr = CC_GET_PLATFORM_INTERFACE(cc::SystemWindowManager);
    auto *window = windowMgr->getWindowFromNSWindow([self window]);
    return window->getWindowId();
}
@end