Qt 5.7 | Qt Canvas 3D | One Qt Example | SwipeArea.qml Example File

Qt 5.7.1 Reference Documentation

# SwipeArea.qml Example File

threejs/oneqt/SwipeArea.qml

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      import QtQuick 2.0

      MouseArea {
          id: mouseSwipeArea
          preventStealing: true

          property real prevX: 0
          property real prevY: 0
          property real velocityX: 0.0
          property real velocityY: 0.0
          property int startX: 0
          property int startY: 0
          property bool tracing: false

          signal swipeLeft()
          signal swipeRight()
          signal swipeUp()
          signal swipeDown()

          onPressed: {
              startX = mouse.x
              startY = mouse.y
              prevX = mouse.x
              prevY = mouse.y
              velocityX = 0
              velocityY = 0
              tracing = true
          }

          onPositionChanged: {
              if ( !tracing ) return
              var currVelX = (mouse.x-prevX)
              var currVelY = (mouse.y-prevY)

              velocityX = (velocityX + currVelX)/2.0;
              velocityY = (velocityY + currVelY)/2.0;

              prevX = mouse.x
              prevY = mouse.y

              if ( velocityX > 15 && mouse.x > mouseSwipeArea.width * 0.25 ) {
                  tracing = false
                  // Swipe Right
                  mouseSwipeArea.swipeRight()
              } else if ( velocityX < -15 && mouse.x < mouseSwipeArea.width * 0.75 ) {
                  tracing = false
                  // Swipe Left
                  mouseSwipeArea.swipeLeft()
              } else if (velocityY > 15 && mouse.y > mouseSwipeArea.height * 0.25 ) {
                  tracing = false
                  // Swipe Down
                  mouseSwipeArea.swipeDown()
              } else if ( velocityY < -15 && mouse.y < mouseSwipeArea.height * 0.75 ) {
                  tracing = false
                  // Swipe Up
                  mouseSwipeArea.swipeUp()
              }
          }
      }