diff options
Diffstat (limited to 'src/quick/handlers/qquicktaphandler.cpp')
| -rw-r--r-- | src/quick/handlers/qquicktaphandler.cpp | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/src/quick/handlers/qquicktaphandler.cpp b/src/quick/handlers/qquicktaphandler.cpp index 8313b415bf..a1b4f961ed 100644 --- a/src/quick/handlers/qquicktaphandler.cpp +++ b/src/quick/handlers/qquicktaphandler.cpp @@ -61,14 +61,20 @@ int QQuickTapHandler::m_touchMultiTapDistanceSquared(-1); TapHandler is a handler for taps on a touchscreen or clicks on a mouse. - Detection of a valid tap gesture depends on \l gesturePolicy. + Detection of a valid tap gesture depends on \l gesturePolicy. The default + value is DragThreshold, which requires the press and release to be close + together in both space and time. In this case, DragHandler is able to + function using only a passive grab, and therefore does not interfere with + event delivery to any other Items or Pointer Handlers. So the default + gesturePolicy is useful when you want to modify behavior of an existing + control or Item by adding a TapHandler with bindings and/or JavaScript + callbacks. + Note that buttons (such as QPushButton) are often implemented not to care whether the press and release occur close together: if you press the button and then change your mind, you need to drag all the way off the edge of the - button in order to cancel the click. Therefore the default - \l gesturePolicy is \c TapHandler.ReleaseWithinBounds. If you want to require - that the press and release are close together in both space and time, - set it to \c TapHandler.DragThreshold. + button in order to cancel the click. For this use case, set the + \l gesturePolicy to \c TapHandler.ReleaseWithinBounds. For multi-tap gestures (double-tap, triple-tap etc.), the distance moved must not exceed QPlatformTheme::MouseDoubleClickDistance with mouse and @@ -81,7 +87,7 @@ int QQuickTapHandler::m_touchMultiTapDistanceSquared(-1); QQuickTapHandler::QQuickTapHandler(QObject *parent) : QQuickSinglePointHandler(parent) , m_pressed(false) - , m_gesturePolicy(ReleaseWithinBounds) + , m_gesturePolicy(DragThreshold) , m_tapCount(0) , m_longPressThreshold(-1) , m_lastTapTimestamp(0.0) |