Qt 5.11 | Qt Quick | Qt Quick Examples - Local Storage | localstorage.qml Example File

Qt 5.11.3 Reference Documentation

# localstorage.qml Example File

localstorage/localstorage/localstorage.qml

      /****************************************************************************
      **
      ** Copyright (C) 2017 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the documentation of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** 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.
      **
      ** BSD License Usage
      ** Alternatively, you may use this file under the terms of the BSD license
      ** as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      import QtQuick 2.5
      import QtQuick.Window 2.2
      import QtQuick.Layouts 1.1
      import QtQuick.LocalStorage 2.0
      import "Database.js" as JS

      Window {
          visible: true
          width: Screen.width / 2
          height: Screen.height / 1.8
          color: "#161616"

          property bool creatingNewEntry: false
          property bool editingEntry: false

          Rectangle {
              anchors.fill: parent

              ColumnLayout {
                  anchors.fill: parent

                  Header {
                      id: input
                      Layout.fillWidth: true
                  }
                  RowLayout {
                      MyButton {
                          text: "New"
                          onClicked: {
                              input.initrec_new()
                              creatingNewEntry = true
                              listView.model.setProperty(listView.currentIndex, "id", 0)
                          }
                      }
                      MyButton {
                          id: saveButton
                          enabled: (creatingNewEntry || editingEntry) && listView.currentIndex != -1
                          text: "Save"
                          onClicked: {
                              var insertedRow = false;
                              if (listView.model.get(listView.currentIndex).id < 1) {
                                  //insert mode
                                  if (input.insertrec()) {
                                      // Successfully inserted a row.
                                      input.setlistview()
                                      insertedRow = true
                                  } else {
                                      // Failed to insert a row; display an error message.
                                      statustext.text = "Failed to insert row"
                                  }
                              } else {
                                  // edit mode
                                  input.setlistview()
                                  JS.dbUpdate(listView.model.get(listView.currentIndex).date,
                                              listView.model.get(listView.currentIndex).trip_desc,
                                              listView.model.get(listView.currentIndex).distance,
                                              listView.model.get(listView.currentIndex).id)
                              }

                              if (insertedRow) {
                                  input.initrec()
                                  creatingNewEntry = false
                                  editingEntry = false
                                  listView.forceLayout()
                              }
                          }
                      }
                      MyButton {
                          id: editButton
                          text: "Edit"
                          enabled: !creatingNewEntry && !editingEntry && listView.currentIndex != -1
                          onClicked: {
                              input.editrec(listView.model.get(listView.currentIndex).date,
                                            listView.model.get(listView.currentIndex).trip_desc,
                                            listView.model.get(listView.currentIndex).distance,
                                            listView.model.get(listView.currentIndex).id)

                              editingEntry = true
                          }
                      }
                      MyButton {
                          id: deleteButton
                          text: "Delete"
                          enabled: !creatingNewEntry && listView.currentIndex != -1
                          onClicked: {
                              JS.dbDeleteRow(listView.model.get(listView.currentIndex).id)
                              listView.model.remove(listView.currentIndex, 1)
                              if (listView.count == 0) {
                                  // ListView doesn't automatically set its currentIndex to -1
                                  // when the count becomes 0.
                                  listView.currentIndex = -1
                              }
                          }
                      }
                      MyButton {
                          id: cancelButton
                          text: "Cancel"
                          enabled: (creatingNewEntry || editingEntry) && listView.currentIndex != -1
                          onClicked: {
                              if (listView.model.get(listView.currentIndex).id === 0) {
                                  // This entry had an id of 0, which means it was being created and hadn't
                                  // been saved to the database yet, so we can safely remove it from the model.
                                  listView.model.remove(listView.currentIndex, 1)
                              }
                              listView.forceLayout()
                              creatingNewEntry = false
                              editingEntry = false
                              input.initrec()
                          }
                      }
                      MyButton {
                          text: "Exit"
                          onClicked: Qt.quit()
                      }
                  }
                  Component {
                      id: highlightBar
                      Rectangle {
                          width: listView.currentItem.width
                          height: listView.currentItem.height
                          color: "lightgreen"
                      }
                  }
                  ListView {
                      id: listView
                      Layout.fillWidth: true
                      Layout.fillHeight: true
                      model: MyModel {}
                      delegate: MyDelegate {}
                      // Don't allow changing the currentIndex while the user is creating/editing values.
                      enabled: !creatingNewEntry && !editingEntry

                      highlight: highlightBar
                      highlightFollowsCurrentItem: true
                      focus: true

                      header: Component {
                          Text {
                              text: "Saved activities"
                          }
                      }
                  }
                  Text {
                      id: statustext
                      color: "red"
                      Layout.fillWidth: true
                      font.bold: true
                      font.pointSize: 20

                  }
              }
          }
          Component.onCompleted: {
              JS.dbInit()
          }
      }