I guess it's related with this change, adb156e4dd64609ba6c0b172e9c428a79e306a7c https://codereview.qt-project.org/37451
Regards, Liang ________________________________ From: [email protected] [[email protected]] on behalf of VStevenP [[email protected]] Sent: Tuesday, November 13, 2012 4:20 AM To: [email protected] Subject: [Development] potential mouse delta problem in Qt5 Beta2 on Mac OS X? The following QML code is an example of a functional 2D knob in Qt5 Beta1. It no longer works in Qt5 Beta2, using latest successful build from November 12. I am on Mac OS 10.7.4 (Lion). Perhaps something has changed and I need to recode this example knob; if so, please advise and possibly add some information in the upcoming Qt5 Beta2 release notes if needed. Perhaps this a potential bug in Qt5 Beta2. Additional info: To move the knob, I use a 2-finger up-and-down- swipe on the trackpad, or I click-and-drag a mouse up-and-down on the knob. This causes the knob to rotate clockwise/counterclockwise. I tested this using qmlscene.) Moving the knob result in some deprecated messages from qmlscene in Qt5 Beta1. 2012-11-12 21:52:52.063 qmlscene[23502:b03] -_continuousScroll is deprecated for NSScrollWheel. Please use -hasPreciseScrollingDeltas. 2012-11-12 21:52:52.063 qmlscene[23502:b03] -deviceDeltaX is deprecated for NSScrollWheel. Please use -scrollingDeltaX. 2012-11-12 21:52:52.064 qmlscene[23502:b03] -deviceDeltaY is deprecated for NSScrollWheel. Please use -scrollingDeltaY. In Qt5 Beta2, these messages no longer occur, and of course, the knob doesn't move either. Maybe this is a clue to the problem? Here is the source qml: Knob.qml (to test, you would need to provide your own 39x39 pixel knob image in a file named knob.png) -------------- import QtQuick 2.0 Image { id: knob property real minimumvalue: 0 property real maximumvalue: 99 property real minimumrotation: 0 property real maximumrotation: 305 property real value: 0 width: 39 height: 39 smooth: true Image { id: knobImage anchors.fill: parent source: "knob.png" rotation: knob.minimumrotation + knob.value / knob.maximumvalue * knob.maximumrotation smooth: true } MouseArea { property int previousY: 0 anchors.fill: knobImage onPressed: previousY = mouse.y onPositionChanged: { var delta = (previousY - mouse.y) * 1.00 if (knob.value + delta > knob.maximumvalue) { knob.value = knob.maximumvalue } else if (knob.value + delta < knob.minimumvalue) { knob.value = knob.minimumvalue } else { knob.value += delta previousY = mouse.y } } } }
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