DialogPage.qml Example File

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 import QtQuick 2.12
 import QtQuick.Layouts 1.12
 import QtQuick.Controls 2.12

 ScrollablePage {
     id: page

     readonly property int buttonWidth: Math.max(button.implicitWidth, Math.min(button.implicitWidth * 2, page.availableWidth / 3))

     Column {
         spacing: 40
         width: parent.width

         Label {
             width: parent.width
             wrapMode: Label.Wrap
             horizontalAlignment: Qt.AlignHCenter
             text: "Dialog is a popup that is mostly used for short-term tasks "
                 + "and brief communications with the user."
         }

         Button {
             text: "Message"
             anchors.horizontalCenter: parent.horizontalCenter
             width: buttonWidth
             onClicked: messageDialog.open()

             Dialog {
                 id: messageDialog

                 x: (parent.width - width) / 2
                 y: (parent.height - height) / 2

                 title: "Message"

                 Label {
                     text: "Lorem ipsum dolor sit amet..."
                 }
             }
         }

         Button {
             id: button
             text: "Confirmation"
             anchors.horizontalCenter: parent.horizontalCenter
             width: buttonWidth
             onClicked: confirmationDialog.open()

             Dialog {
                 id: confirmationDialog

                 x: (parent.width - width) / 2
                 y: (parent.height - height) / 2
                 parent: Overlay.overlay

                 modal: true
                 title: "Confirmation"
                 standardButtons: Dialog.Yes | Dialog.No

                 Column {
                     spacing: 20
                     anchors.fill: parent
                     Label {
                         text: "The document has been modified.\nDo you want to save your changes?"
                     }
                     CheckBox {
                         text: "Do not ask again"
                         anchors.right: parent.right
                     }
                 }
             }
         }

         Button {
             text: "Content"
             anchors.horizontalCenter: parent.horizontalCenter
             width: buttonWidth
             onClicked: contentDialog.open()

             Dialog {
                 id: contentDialog

                 x: (parent.width - width) / 2
                 y: (parent.height - height) / 2
                 width: Math.min(page.width, page.height) / 3 * 2
                 contentHeight: logo.height * 2
                 parent: Overlay.overlay

                 modal: true
                 title: "Content"
                 standardButtons: Dialog.Close

                 Flickable {
                     id: flickable
                     clip: true
                     anchors.fill: parent
                     contentHeight: column.height

                     Column {
                         id: column
                         spacing: 20
                         width: parent.width

                         Image {
                             id: logo
                             width: parent.width / 2
                             anchors.horizontalCenter: parent.horizontalCenter
                             fillMode: Image.PreserveAspectFit
                             source: "../images/qt-logo.png"
                         }

                         Label {
                             width: parent.width
                             text: "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc finibus "
                                 + "in est quis laoreet. Interdum et malesuada fames ac ante ipsum primis "
                                 + "in faucibus. Curabitur eget justo sollicitudin enim faucibus bibendum. "
                                 + "Suspendisse potenti. Vestibulum cursus consequat mauris id sollicitudin. "
                                 + "Duis facilisis hendrerit consectetur. Curabitur sapien tortor, efficitur "
                                 + "id auctor nec, efficitur et nisl. Ut venenatis eros in nunc placerat, "
                                 + "eu aliquam enim suscipit."
                             wrapMode: Label.Wrap
                         }
                     }

                     ScrollIndicator.vertical: ScrollIndicator {
                         parent: contentDialog.contentItem
                         anchors.top: flickable.top
                         anchors.bottom: flickable.bottom
                         anchors.right: parent.right
                         anchors.rightMargin: -contentDialog.rightPadding + 1
                     }
                 }
             }
         }

         Button {
             text: "Input"
             anchors.horizontalCenter: parent.horizontalCenter
             width: buttonWidth
             onClicked: inputDialog.open()

             Dialog {
                 id: inputDialog

                 x: (parent.width - width) / 2
                 y: (parent.height - height) / 2
                 parent: Overlay.overlay

                 focus: true
                 modal: true
                 title: "Input"
                 standardButtons: Dialog.Ok | Dialog.Cancel

                 ColumnLayout {
                     spacing: 20
                     anchors.fill: parent
                     Label {
                         elide: Label.ElideRight
                         text: "Please enter the credentials:"
                         Layout.fillWidth: true
                     }
                     TextField {
                         focus: true
                         placeholderText: "Username"
                         Layout.fillWidth: true
                     }
                     TextField {
                         placeholderText: "Password"
                         echoMode: TextField.PasswordEchoOnEdit
                         Layout.fillWidth: true
                     }
                 }
             }
         }
     }
 }