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179 lines
6.0 KiB
Objective-C
179 lines
6.0 KiB
Objective-C
//
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// CSScanTargetView.h
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// Clock Signal
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//
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// Created by Thomas Harte on 16/07/2015.
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// Copyright 2015 Thomas Harte. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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#import <AppKit/AppKit.h>
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#import <MetalKit/MetalKit.h>
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@class CSScanTargetView;
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@class CSScanTarget;
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@protocol CSScanTargetViewResponderDelegate <NSObject>
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/*!
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Supplies a keyDown event to the delegate.
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@param event The @c NSEvent describing the keyDown.
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*/
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- (void)keyDown:(nonnull NSEvent *)event;
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/*!
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Supplies a keyUp event to the delegate.
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@param event The @c NSEvent describing the keyUp.
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*/
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- (void)keyUp:(nonnull NSEvent *)event;
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/*!
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Supplies a flagsChanged event to the delegate.
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@param event The @c NSEvent describing the flagsChanged.
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*/
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- (void)flagsChanged:(nonnull NSEvent *)event;
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/*!
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Supplies a paste event to the delegate.
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*/
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- (void)paste:(nonnull id)sender;
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@optional
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/*!
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Supplies a mouse moved event to the delegate. This functions only if
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shouldCaptureMouse is set to YES, in which case the view will ensure it captures
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the mouse and returns only relative motion
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(Cf. CGAssociateMouseAndMouseCursorPosition). It will also elide mouseDragged:
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(and rightMouseDragged:, etc) and mouseMoved: events.
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*/
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- (void)mouseMoved:(nonnull NSEvent *)event;
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/*!
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Supplies a mouse button down event. This elides mouseDown, rightMouseDown and otherMouseDown.
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@c shouldCaptureMouse must be set to @c YES to receive these events.
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*/
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- (void)mouseDown:(nonnull NSEvent *)event;
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/*!
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Supplies a mouse button up event. This elides mouseUp, rightMouseUp and otherMouseUp.
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@c shouldCaptureMouse must be set to @c YES to receive these events.
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*/
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- (void)mouseUp:(nonnull NSEvent *)event;
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/*!
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Announces 'capture' of the mouse — i.e. that the view is now preventing the mouse from exiting
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the window, in order to forward continuous mouse motion.
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@param view The view making the announcement.
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*/
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- (void)scanTargetViewDidCaptureMouse:(nonnull CSScanTargetView *)view;
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/*!
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Announces that the mouse is no longer captured.
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@param view The view making the announcement.
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*/
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- (void)scanTargetViewDidReleaseMouse:(nonnull CSScanTargetView *)view;
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/*!
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Announces that the OS mouse cursor is now being displayed again, after having been invisible.
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@param view The view making the announcement.
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*/
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- (void)scanTargetViewDidShowOSMouseCursor:(nonnull CSScanTargetView *)view;
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/*!
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Announces that the OS mouse cursor would now be hidden; 'would' means that if this is not
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a mouse capture-enabled view then it will be hidden, but otherwise it might or might not be
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as per whatever is user-friendly.
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@param view The view making the announcement.
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*/
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- (void)scanTargetViewWouldHideOSMouseCursor:(nonnull CSScanTargetView *)view;
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/*!
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Announces receipt of a file by drag and drop to the delegate.
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@param view The view making the request.
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@param URL The file URL of the received file.
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*/
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- (void)scanTargetView:(nonnull CSScanTargetView *)view didReceiveFileAtURL:(nonnull NSURL *)URL;
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@end
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/*!
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Although I'm still on the fence about this as a design decision, CSScanTargetView is itself responsible
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for creating and destroying a CVDisplayLink. There's a practical reason for this: you'll get real synchronisation
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only if a link is explicitly tied to a particular display, and the CSScanTargetView therefore owns the knowledge
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necessary to decide when to create and modify them. It doesn't currently just propagate "did change screen"-type
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messages because I haven't yet found a way to track that other than polling, in which case I might as well put
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that into the display link callback.
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*/
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@protocol CSScanTargetViewDisplayLinkDelegate
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/*!
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Informs the delegate that the display link has fired.
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*/
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- (void)scanTargetViewDisplayLinkDidFire:(nonnull CSScanTargetView *)view now:(nonnull const CVTimeStamp *)now outputTime:(nonnull const CVTimeStamp *)outputTime;
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@end
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/*!
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Provides a visible scan target with a refresh-linked update timer that can forward a subset
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of typical first-responder actions.
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*/
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@interface CSScanTargetView : MTKView
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@property (nonatomic, weak, nullable) id <CSScanTargetViewResponderDelegate> responderDelegate;
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@property (atomic, weak, nullable) id <CSScanTargetViewDisplayLinkDelegate> displayLinkDelegate;
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/// Determines whether the view offers mouse capturing — i.e. if the user clicks on the view then
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/// then the system cursor is disabled and the mouse events defined by CSScanTargetViewResponderDelegate
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/// are forwarded, unless and until the user releases the mouse using the control+command shortcut.
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@property (nonatomic, assign) BOOL shouldCaptureMouse;
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/// Determines whether the CSScanTargetViewResponderDelegate of this window expects to use the command
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/// key as though it were any other key — i.e. all command combinations should be forwarded to the delegate,
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/// not being allowed to trigger regular application shortcuts such as command+q or command+h.
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///
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/// How the view respects this will depend on other state; if this view is one that captures the mouse then it
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/// will usurp command only while the mouse is captured.
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///
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/// TODO: what's smart behaviour if this view doesn't capture the mouse? Probably
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/// force a similar capturing behaviour?
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@property (nonatomic, assign) BOOL shouldUsurpCommand;
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/*!
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Ends the timer tracking time; should be called prior to giving up the last owning reference
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to ensure that any retain cycles implied by the timer are resolved.
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*/
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- (void)invalidate;
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/*!
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Ensures output begins on all pending scans.
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*/
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- (void)updateBacking;
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/*!
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Instructs that the mouse cursor, if currently captured, should be released.
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*/
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- (void)releaseMouse;
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/*!
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@returns An image of the view's current contents.
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*/
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- (nonnull NSBitmapImageRep *)imageRepresentation;
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/*!
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@returns The CSScanTarget being used for this display.
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*/
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@property(nonatomic, readonly, nonnull) CSScanTarget *scanTarget;
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/*!
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Indicates that the enclosed scan target is about to be handed off to a new owner;
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exactly identical to calling scanTarget.will_change_owner().
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*/
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- (void)willChangeScanTargetOwner;
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/*!
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@returns The period of a frame.
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*/
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@property(nonatomic, readonly) double refreshPeriod;
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@end
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