Twyco
4afaa79834
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103 lines
4.5 KiB
Objective-C
103 lines
4.5 KiB
Objective-C
#import <AppKit/AppKit.h>
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#import <WebKit/WebKit.h>
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#import <objc/runtime.h>
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// Keep AppKit's system swipe preferences and cancellation thresholds, but use
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// script history traversal so asynchronously created Inertia entries aren't skipped.
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@interface KanbanNavigation : NSObject
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@property(nonatomic, weak) WKWebView *webview;
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@property(nonatomic, strong) id monitor;
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@property(nonatomic) BOOL pending;
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@property(nonatomic) BOOL tracking;
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@property(nonatomic) BOOL blocked;
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@property(nonatomic) NSUInteger sequence;
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@end
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@implementation KanbanNavigation
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- (BOOL)swipeTrackingEnabled {
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return NSEvent.isSwipeTrackingFromScrollEventsEnabled;
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}
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- (void)dealloc {
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if (_monitor) [NSEvent removeMonitor:_monitor];
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}
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- (NSEvent *)handleEvent:(NSEvent *)event {
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WKWebView *webview = self.webview;
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if (!webview || event.window != webview.window || !webview.window.isKeyWindow ||
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webview.hidden || ![self swipeTrackingEnabled]) return event;
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if (event.phase == NSEventPhaseBegan) {
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self.sequence++;
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self.blocked = NO;
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self.pending = NO;
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self.tracking = NO;
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}
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if (self.tracking) return nil;
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if (event.phase == NSEventPhaseEnded || event.phase == NSEventPhaseCancelled) {
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self.sequence++;
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self.pending = NO;
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return event;
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}
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if (self.blocked || self.pending || event.momentumPhase != NSEventPhaseNone ||
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!(event.phase & (NSEventPhaseBegan | NSEventPhaseChanged)) || !event.hasPreciseScrollingDeltas) return event;
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if (fabs(event.scrollingDeltaX) <= fabs(event.scrollingDeltaY)) {
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if (fabs(event.scrollingDeltaY) > 0) self.blocked = YES;
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return event;
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}
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NSPoint point = [webview convertPoint:event.locationInWindow fromView:nil];
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if (!NSPointInRect(point, webview.bounds)) return event;
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if (!webview.isFlipped) point.y = webview.bounds.size.height - point.y;
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NSString *script = [NSString stringWithFormat:@"window.__kanbanNavigation?.canSwipe(%f, %f) === true", point.x, point.y];
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self.pending = YES;
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NSUInteger sequence = self.sequence;
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NSURL *page = webview.URL;
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__weak KanbanNavigation *weakSelf = self;
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[webview evaluateJavaScript:script completionHandler:^(id allowed, NSError *error) {
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KanbanNavigation *owner = weakSelf;
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if (!owner || owner.sequence != sequence) return;
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owner.pending = NO;
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owner.blocked = YES;
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if (error || ![allowed isEqual:@YES] || ![webview.URL isEqual:page] ||
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(!webview.canGoBack && !webview.canGoForward)) return;
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owner.tracking = YES;
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[event trackSwipeEventWithOptions:NSEventSwipeTrackingLockDirection | NSEventSwipeTrackingClampGestureAmount
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dampenAmountThresholdMin:webview.canGoForward ? -1 : 0
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max:webview.canGoBack ? 1 : 0
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usingHandler:^(CGFloat amount, NSEventPhase phase, BOOL complete, BOOL *stop) {
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KanbanNavigation *current = weakSelf;
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if (current.sequence != sequence) {
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*stop = YES;
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return;
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}
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if (!current || !webview.window.isKeyWindow || ![webview.URL isEqual:page]) {
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current.tracking = NO;
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*stop = YES;
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return;
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}
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if (!complete) return;
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current.tracking = NO;
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if (phase == NSEventPhaseCancelled) return;
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NSInteger direction = amount >= 1 ? -1 : amount <= -1 ? 1 : 0;
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if ((direction == -1 && webview.canGoBack) || (direction == 1 && webview.canGoForward)) {
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NSString *navigate = [NSString stringWithFormat:@"if (%@) window.__kanbanNavigation.step(%ld)", script, (long)direction];
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[webview evaluateJavaScript:navigate completionHandler:nil];
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}
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}];
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}];
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return event;
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}
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@end
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void install_workspace_navigation(void *pointer) {
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WKWebView *webview = (__bridge WKWebView *)pointer;
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webview.allowsBackForwardNavigationGestures = NO;
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KanbanNavigation *navigation = [KanbanNavigation new];
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navigation.webview = webview;
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__weak KanbanNavigation *weakNavigation = navigation;
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navigation.monitor = [NSEvent addLocalMonitorForEventsMatchingMask:NSEventMaskScrollWheel handler:^NSEvent *(NSEvent *event) {
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KanbanNavigation *owner = weakNavigation;
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return owner ? [owner handleEvent:event] : event;
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}];
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objc_setAssociatedObject(webview, @selector(handleEvent:), navigation, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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