Qt 5.11 | Qt Virtual Keyboard | Qt Quick Virtual Keyboard - Basic Example | AutoScroller.qml Example File

Qt Virtual Keyboard | Commercial or GPLv3

# AutoScroller.qml Example File

basic/content/AutoScroller.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
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      ** Alternatively, this file may be used under the terms of the GNU
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      ** the Free Software Foundation and appearing in the file LICENSE.GPL3
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      import QtQuick 2.0
      import QtQuick.VirtualKeyboard 2.1

      Item {
          property var flickable
          readonly property var inputItem: InputContext.inputItem

          onInputItemChanged: delayedLoading.start()

          function ensureVisible(flickable) {
              if (!Qt.inputMethod.visible || !inputItem || !flickable || !flickable.visible/* || !flickable.interactive*/)
                  return;

              var verticallyFlickable = (flickable.flickableDirection === Flickable.HorizontalAndVerticalFlick || flickable.flickableDirection === Flickable.VerticalFlick
                                         || (flickable.flickableDirection === Flickable.AutoFlickDirection && flickable.contentHeight > flickable.height))
              var horizontallyFlickable = (flickable.flickableDirection === Flickable.HorizontalAndVerticalFlick || flickable.flickableDirection === Flickable.HorizontalFlick
                                           || (flickable.flickableDirection === Flickable.AutoFlickDirection && flickable.contentWidth > flickable.width))

              if ((!verticallyFlickable && !horizontallyFlickable) || !inputItem.hasOwnProperty("cursorRectangle"))
                  return

              var cursorRectangle = flickable.contentItem.mapFromItem(inputItem, inputItem.cursorRectangle.x, inputItem.cursorRectangle.y)

              if (verticallyFlickable) {
                  var scrollMarginVertical = flickable.scrollMarginVertical ? flickable.scrollMarginVertical : 10
                  if (flickable.contentY >= cursorRectangle.y - scrollMarginVertical) {
                      // The flickable is foo far down; move it up.
                      flickable.contentY = Math.max(0, cursorRectangle.y  - scrollMarginVertical)
                  } else if (flickable.contentY + flickable.height <= cursorRectangle.y  + inputItem.cursorRectangle.height + scrollMarginVertical) {
                      // The flickable is foo far up; move it down.
                      flickable.contentY = Math.min(flickable.contentHeight - flickable.height, cursorRectangle.y + inputItem.cursorRectangle.height - flickable.height + scrollMarginVertical)
                  }
              }
              if (horizontallyFlickable) {
                  var scrollMarginHorizontal = flickable.scrollMarginHorizontal ? flickable.scrollMarginHorizontal : 10
                  if (flickable.contentX >= cursorRectangle.x - scrollMarginHorizontal) {
                      // The flickable is foo far down; move it up.
                      flickable.contentX = Math.max(0, cursorRectangle.x - scrollMarginHorizontal)
                  } else if (flickable.contentX + flickable.width <= cursorRectangle.x + inputItem.cursorRectangle.width + scrollMarginHorizontal) {
                      // The flickable is foo far up; move it down.
                      flickable.contentX = Math.min(flickable.contentWidth - flickable.width, cursorRectangle.x + inputItem.cursorRectangle.width - flickable.width + scrollMarginHorizontal)
                  }
              }
          }
          Timer {
              id: delayedLoading
              interval: 10
              onTriggered: ensureVisible(flickable)
          }
          Connections {
              ignoreUnknownSignals: true
              target: Qt.inputMethod
              onKeyboardRectangleChanged: delayedLoading.start()
          }
          Connections {
              ignoreUnknownSignals: true
              target: inputItem
              enabled: inputItem && inputItem.activeFocus
              onCursorRectangleChanged: delayedLoading.start()
          }
      }