Qt 5.9 | Qt Virtual Keyboard | Qt Quick Virtual Keyboard - Basic Example | HandwritingModeButton.qml Example File

Qt 5.9.4 Reference Documentation

# HandwritingModeButton.qml Example File

basic/content/HandwritingModeButton.qml

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the Qt Virtual Keyboard module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:GPL$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** GNU General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU
      ** General Public License version 3 or (at your option) any later version
      ** approved by the KDE Free Qt Foundation. The licenses are as published by
      ** the Free Software Foundation and appearing in the file LICENSE.GPL3
      ** included in the packaging of this file. Please review the following
      ** information to ensure the GNU General Public License requirements will
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      import QtQuick 2.0

      Item {
          id: handwritingModeButton
          state: "unavailable"
          property bool floating
          property bool flipable
          readonly property real __minWidthHeight: Math.min(width, height)

          signal clicked()
          signal doubleClicked()

          Flipable {
              id: flipableImage
              anchors.fill: parent

              property bool flipped

              front: Image {
                  sourceSize.width: handwritingModeButton.__minWidthHeight
                  sourceSize.height: handwritingModeButton.__minWidthHeight
                  smooth: false
                  source: "qrc:/content/FloatingButton_Unavailable.svg"
              }

              back: Image {
                  id: buttonImage
                  sourceSize.width: handwritingModeButton.__minWidthHeight
                  sourceSize.height: handwritingModeButton.__minWidthHeight
                  smooth: false
                  source: "qrc:/content/FloatingButton_Available.svg"
              }

              states: State {
                  PropertyChanges { target: rotation; angle: 180 }
                  when: flipableImage.flipped
              }

              transform: Rotation {
                  id: rotation
                  origin.x: flipableImage.width / 2
                  origin.y: flipableImage.height / 2
                  axis { x: 0; y: 1; z: 0 }
                  angle: 0
              }

              transitions: Transition {
                  enabled: handwritingModeButton.flipable
                  NumberAnimation { target: rotation; property: "angle"; duration: 400 }
              }
          }

          states: [
              State {
                  name: "available"
                  PropertyChanges { target: flipableImage; flipped: true }
              },
              State {
                  name: "active"
                  PropertyChanges { target: flipableImage; flipped: true }
                  PropertyChanges { target: buttonImage; source: "qrc:/content/FloatingButton_Active.svg" }
              }
          ]

          function snapHorizontal() {
              if (!floating)
                  return
              if (mouseArea.drag.maximumX > mouseArea.drag.minimumX) {
                  if (x + 20 >= mouseArea.drag.maximumX) {
                      anchors.left = undefined
                      anchors.right = parent.right
                  } else if (x - 20 <= mouseArea.drag.minimumX) {
                      anchors.right = undefined
                      anchors.left = parent.left
                  }
              }
          }

          function snapVertical() {
              if (!floating)
                  return
              if (mouseArea.drag.maximumY > mouseArea.drag.minimumY) {
                  if (y + 20 >= mouseArea.drag.maximumY) {
                      anchors.top = undefined
                      anchors.bottom = parent.bottom
                  } else if (y - 20 <= mouseArea.drag.minimumY) {
                      anchors.bottom = undefined
                      anchors.top = parent.top
                  }
              }
          }

          MouseArea {
              id: mouseArea
              anchors.fill: parent
              drag {
                  target: handwritingModeButton.floating ? handwritingModeButton : undefined
                  axis: Drag.XAxis | Drag.YAxis
                  minimumX: 0
                  maximumX: handwritingModeButton.parent.width - handwritingModeButton.width
                  onMaximumXChanged: !mouseArea.drag.active && handwritingModeButton.snapHorizontal()
                  minimumY: 0
                  maximumY: handwritingModeButton.parent.height - handwritingModeButton.height
                  onMaximumYChanged: !mouseArea.drag.active && handwritingModeButton.snapVertical()
              }
              onPressed: {
                  if (!handwritingModeButton.floating)
                      return
                  handwritingModeButton.anchors.left = undefined
                  handwritingModeButton.anchors.top = undefined
                  handwritingModeButton.anchors.right = undefined
                  handwritingModeButton.anchors.bottom = undefined
              }
              onReleased: {
                  handwritingModeButton.snapHorizontal()
                  handwritingModeButton.snapVertical()
              }
              onClicked: {
                  handwritingModeButton.snapHorizontal()
                  handwritingModeButton.snapVertical()
                  clickTimer.restart()
              }
              onDoubleClicked: {
                  clickTimer.stop()
                  handwritingModeButton.snapHorizontal()
                  handwritingModeButton.snapVertical()
                  handwritingModeButton.doubleClicked()
              }
              Timer {
                  id: clickTimer
                  interval: Qt.styleHints ? Qt.styleHints.mouseDoubleClickInterval / 3 : 0
                  repeat: false
                  onTriggered: handwritingModeButton.clicked()
              }
          }
      }