154 lines
4.7 KiB
Plaintext
154 lines
4.7 KiB
Plaintext
#import "ViewController.h"
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#import "Renderer.h"
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#include "imgui.h"
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#if TARGET_OS_OSX
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#include "imgui_impl_osx.h"
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#endif
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@interface ViewController ()
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@property (nonatomic, readonly) MTKView *mtkView;
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@property (nonatomic, strong) Renderer *renderer;
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@end
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@implementation ViewController
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- (MTKView *)mtkView {
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return (MTKView *)self.view;
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}
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- (void)viewDidLoad
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{
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[super viewDidLoad];
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self.mtkView.device = MTLCreateSystemDefaultDevice();
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if (!self.mtkView.device) {
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NSLog(@"Metal is not supported");
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abort();
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}
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self.renderer = [[Renderer alloc] initWithView:self.mtkView];
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[self.renderer mtkView:self.mtkView drawableSizeWillChange:self.mtkView.bounds.size];
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self.mtkView.delegate = self.renderer;
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#if TARGET_OS_OSX
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// Add a tracking area in order to receive mouse events whenever the mouse is within the bounds of our view
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NSTrackingArea *trackingArea = [[NSTrackingArea alloc] initWithRect:NSZeroRect
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options:NSTrackingMouseMoved | NSTrackingInVisibleRect | NSTrackingActiveAlways
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owner:self
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userInfo:nil];
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[self.view addTrackingArea:trackingArea];
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// If we want to receive key events, we either need to be in the responder chain of the key view,
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// or else we can install a local monitor. The consequence of this heavy-handed approach is that
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// we receive events for all controls, not just Dear ImGui widgets. If we had native controls in our
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// window, we'd want to be much more careful than just ingesting the complete event stream, though we
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// do make an effort to be good citizens by passing along events when Dear ImGui doesn't want to capture.
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NSEventMask eventMask = NSEventMaskKeyDown | NSEventMaskKeyUp | NSEventMaskFlagsChanged | NSEventTypeScrollWheel;
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[NSEvent addLocalMonitorForEventsMatchingMask:eventMask handler:^NSEvent * _Nullable(NSEvent *event) {
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BOOL wantsCapture = ImGui_ImplOSX_HandleEvent(event, self.view);
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if (event.type == NSEventTypeKeyDown && wantsCapture) {
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return nil;
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} else {
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return event;
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}
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}];
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ImGui_ImplOSX_Init();
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#endif
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}
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#if TARGET_OS_OSX
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- (void)mouseMoved:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)mouseDown:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)rightMouseDown:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)otherMouseDown:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)mouseUp:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)rightMouseUp:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)otherMouseUp:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)mouseDragged:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)rightMouseDragged:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)otherMouseDragged:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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- (void)scrollWheel:(NSEvent *)event {
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ImGui_ImplOSX_HandleEvent(event, self.view);
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}
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#elif TARGET_OS_IOS
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// This touch mapping is super cheesy/hacky. We treat any touch on the screen
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// as if it were a depressed left mouse button, and we don't bother handling
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// multitouch correctly at all. This causes the "cursor" to behave very erratically
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// when there are multiple active touches. But for demo purposes, single-touch
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// interaction actually works surprisingly well.
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- (void)updateIOWithTouchEvent:(UIEvent *)event {
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UITouch *anyTouch = event.allTouches.anyObject;
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CGPoint touchLocation = [anyTouch locationInView:self.view];
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ImGuiIO &io = ImGui::GetIO();
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io.MousePos = ImVec2(touchLocation.x, touchLocation.y);
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BOOL hasActiveTouch = NO;
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for (UITouch *touch in event.allTouches) {
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if (touch.phase != UITouchPhaseEnded && touch.phase != UITouchPhaseCancelled) {
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hasActiveTouch = YES;
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break;
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}
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}
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io.MouseDown[0] = hasActiveTouch;
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}
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- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
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[self updateIOWithTouchEvent:event];
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}
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- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
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[self updateIOWithTouchEvent:event];
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}
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- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
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[self updateIOWithTouchEvent:event];
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}
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- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
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[self updateIOWithTouchEvent:event];
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}
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#endif
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@end
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