Qt 5.9 | Qt Quick | Qt Quick Examples - Local Storage | localstorage.qml Example File

Qt 5.9.9 Reference Documentation

# localstorage.qml Example File

localstorage/localstorage/localstorage.qml

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      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()
          }
      }