UIKit: Handle UIPress events

On tvOS the system will deliver UIPress events for touch gestures on the
remote such as pressing up, down, left, or right, as well as for the
dedicated hardware buttons, such as menu or play/pause. We deliver
these as Qt key events when possible (the siri, volume and home button
can't be handled).

Change-Id: Id4bd4960e3036a7b8b67cf5b9e9d653f233dc4af
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/plugins/platforms/ios/quiview.mm b/src/plugins/platforms/ios/quiview.mm
index bf929667a6..9f910dfe5e 100644
--- a/src/plugins/platforms/ios/quiview.mm
+++ b/src/plugins/platforms/ios/quiview.mm
@@ -50,6 +50,7 @@
 
 #include <QtGui/private/qguiapplication_p.h>
 #include <QtGui/private/qwindow_p.h>
+#include <qpa/qwindowsysteminterface_p.h>
 
 @implementation QUIView
 
@@ -442,6 +443,58 @@
     QWindowSystemInterface::flushWindowSystemEvents();
 }
 
+- (int)mapPressTypeToKey:(UIPress*)press
+{
+    switch (press.type) {
+    case UIPressTypeUpArrow: return Qt::Key_Up;
+    case UIPressTypeDownArrow: return Qt::Key_Down;
+    case UIPressTypeLeftArrow: return Qt::Key_Left;
+    case UIPressTypeRightArrow: return Qt::Key_Right;
+    case UIPressTypeSelect: return Qt::Key_Select;
+    case UIPressTypeMenu: return Qt::Key_Menu;
+    case UIPressTypePlayPause: return Qt::Key_MediaTogglePlayPause;
+    }
+    return Qt::Key_unknown;
+}
+
+- (bool)processPresses:(NSSet *)presses withType:(QEvent::Type)type {
+    // Presses on Menu button will generate a Menu key event. By default, not handling
+    // this event will cause the application to return to Headboard (tvOS launcher).
+    // When handling the event (for example, as a back button), both press and
+    // release events must be handled accordingly.
+
+    QScopedValueRollback<bool> syncRollback(QWindowSystemInterfacePrivate::synchronousWindowSystemEvents, true);
+
+    bool handled = false;
+    for (UIPress* press in presses) {
+        int key = [self mapPressTypeToKey:press];
+        if (key == Qt::Key_unknown)
+            continue;
+        if (QWindowSystemInterface::handleKeyEvent(m_qioswindow->window(), type, key, Qt::NoModifier))
+            handled = true;
+    }
+
+    return handled;
+}
+
+- (void)pressesBegan:(NSSet<UIPress *> *)presses withEvent:(UIPressesEvent *)event
+{
+    if (![self processPresses:presses withType:QEvent::KeyPress])
+        [super pressesBegan:presses withEvent:event];
+}
+
+- (void)pressesChanged:(NSSet<UIPress *> *)presses withEvent:(UIPressesEvent *)event
+{
+    if (![self processPresses:presses withType:QEvent::KeyPress])
+        [super pressesChanged:presses withEvent:event];
+}
+
+- (void)pressesEnded:(NSSet<UIPress *> *)presses withEvent:(UIPressesEvent *)event
+{
+    if (![self processPresses:presses withType:QEvent::KeyRelease])
+        [super pressesEnded:presses withEvent:event];
+}
+
 - (BOOL)canPerformAction:(SEL)action withSender:(id)sender
 {
 #ifndef Q_OS_TVOS