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iOS plugin: Add support for wheel events

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Use UIPanGestureRecognizer to handle mouse and trackpad scroll.

Task-number: QTBUG-99795
Change-Id: I5db7fabf55b6f2e6f7ba90a0b90ecb08734e2329
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
This commit is contained in:
Doris Verria 2022-06-15 14:57:04 +02:00
parent ac984bd876
commit 77fcd47feb
1 changed files with 81 additions and 0 deletions
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81
src/plugins/platforms/ios/quiview.mm
View File

@ -22,12 +22,16 @@
#include <qpa/qwindowsysteminterface_p.h>
Q_LOGGING_CATEGORY(lcQpaTablet, "qt.qpa.input.tablet")
Q_LOGGING_CATEGORY(lcQpaInputEvents, "qt.qpa.input.events")
@implementation QUIView {
QHash<NSUInteger, QWindowSystemInterface::TouchPoint> m_activeTouches;
UITouch *m_activePencilTouch;
int m_nextTouchId;
NSMutableArray<UIAccessibilityElement *> *m_accessibleElements;
UIPanGestureRecognizer *m_scrollGestureRecognizer;
CGPoint m_lastScrollCursorPos;
CGPoint m_lastScrollDelta;
}
+ (void)load
@ -60,6 +64,23 @@ Q_LOGGING_CATEGORY(lcQpaTablet, "qt.qpa.input.tablet")
if (self = [self initWithFrame:window->geometry().toCGRect()]) {
self.platformWindow = window;
m_accessibleElements = [[NSMutableArray<UIAccessibilityElement *> alloc] init];
m_scrollGestureRecognizer = [[UIPanGestureRecognizer alloc]
initWithTarget:self
action:@selector(handleScroll:)];
// The gesture recognizer should only care about scroll gestures (for now)
// Set allowedTouchTypes to empty array here to not interfere with touch events
// handled by the UIView. Scroll gestures, even those coming from touch devices,
// such as trackpads will still be received as they are not touch events
m_scrollGestureRecognizer.allowedTouchTypes = [NSArray array];
#if QT_IOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__IPHONE_13_4)
if (@available(ios 13.4, *)) {
m_scrollGestureRecognizer.allowedScrollTypesMask = UIScrollTypeMaskAll;
}
#endif
m_scrollGestureRecognizer.maximumNumberOfTouches = 0;
m_lastScrollDelta = CGPointZero;
m_lastScrollCursorPos = CGPointZero;
[self addGestureRecognizer:m_scrollGestureRecognizer];
}
return self;
@ -117,6 +138,7 @@ Q_LOGGING_CATEGORY(lcQpaTablet, "qt.qpa.input.tablet")
- (void)dealloc
{
[m_accessibleElements release];
[m_scrollGestureRecognizer release];
[super dealloc];
}
@ -672,6 +694,65 @@ Q_LOGGING_CATEGORY(lcQpaTablet, "qt.qpa.input.tablet")
UIEditingInteractionConfigurationDefault : UIEditingInteractionConfigurationNone;
}
#if QT_CONFIG(wheelevent)
- (void)handleScroll:(UIPanGestureRecognizer *)recognizer
{
if (!self.platformWindow->window())
return;
if (!self.canBecomeFirstResponder)
return;
CGPoint translation = [recognizer translationInView:self];
CGFloat deltaX = translation.x - m_lastScrollDelta.x;
CGFloat deltaY = translation.y - m_lastScrollDelta.y;
QPoint angleDelta;
// From QNSView implementation:
// "Since deviceDelta is delivered as pixels rather than degrees, we need to
// convert from pixels to degrees in a sensible manner.
// It looks like 1/4 degrees per pixel behaves most native.
// (NB: Qt expects the unit for delta to be 8 per degree):"
const int pixelsToDegrees = 2; // 8 * 1/4
angleDelta.setX(deltaX * pixelsToDegrees);
angleDelta.setY(deltaY * pixelsToDegrees);
QPoint pixelDelta;
pixelDelta.setX(deltaX);
pixelDelta.setY(deltaY);
NSTimeInterval time_stamp = [[NSProcessInfo processInfo] systemUptime];
ulong qt_timestamp = time_stamp * 1000;
Qt::KeyboardModifiers qt_modifierFlags = Qt::NoModifier;
#if QT_IOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__IPHONE_13_4)
if (@available(ios 13.4, *))
qt_modifierFlags = QAppleKeyMapper::fromUIKitModifiers(recognizer.modifierFlags);
#endif
if (recognizer.state == UIGestureRecognizerStateBegan)
// locationInView: doesn't return the cursor position at the time of the wheel event,
// but rather gives us the position with the deltas applied, so we need to save the
// cursor position at the beginning of the gesture
m_lastScrollCursorPos = [recognizer locationInView:self];
if (recognizer.state != UIGestureRecognizerStateEnded) {
m_lastScrollDelta.x = translation.x;
m_lastScrollDelta.y = translation.y;
} else {
m_lastScrollDelta = CGPointZero;
}
QPoint qt_local = QPointF::fromCGPoint(m_lastScrollCursorPos).toPoint();
QPoint qt_global = self.platformWindow->mapToGlobal(qt_local);
qCInfo(lcQpaInputEvents).nospace() << "wheel event" << " at " << qt_local
<< " pixelDelta=" << pixelDelta << " angleDelta=" << angleDelta;
QWindowSystemInterface::handleWheelEvent(self.platformWindow->window(), qt_timestamp, qt_local, qt_global, pixelDelta, angleDelta, qt_modifierFlags);
}
#endif // QT_CONFIG(wheelevent)
@end
@implementation UIView (QtHelpers)