import QtQuick 2.12 import QtQuick.Controls 2.12 import QtQuick.Layouts 1.12 import QtQml.Models 2.1 import org.kde.kirigami 2.12 as Kirigami import DeltaChat 1.0 Kirigami.ScrollablePage { id: chatPage title: chat ? chat.name : qsTr("Chat") required property DcContext context required property DcAccountsEventEmitter eventEmitter required property var chatId readonly property DcChat chat: context.getChat(chatId) function updateMessagelist() { // Reverse message list, because it is laid out from bottom to top. let messagelist = context.getMsgIdList(chatId).reverse() for (let i = 0; i < messagelist.length; i++) { const msgId = messagelist[i] const item = { msgId: msgId } let j; for (j = i; j < messagelistModel.count; j++) { if (messagelistModel.get(j).msgId == msgId) { messagelistModel.move(j, i, 1) messagelistModel.set(i, item) break } } if (j == messagelistModel.count) { messagelistModel.insert(i, item) } } if (messagelistModel.count > messagelist.length) { messagelistModel.remove(messagelist.length, messagelistModel.count - messagelist.length) } } ListModel { id: messagelistModel } Connections { target: chatPage.eventEmitter function onChatModified() { console.log("CHAT MODIFIED!") } function onIncomingMessage(accountId, chatId, msgId) { console.log("Incoming message for chat " + chatId) if (chatId == chatPage.chatId) { chatPage.updateMessagelist() } } function onMessagesChanged(accountId, chatId, msgId) { console.log("Messages changed for chat " + chatId) if (chatId == chatPage.chatId || chatId == 0) { chatPage.updateMessagelist() } } } Component.onCompleted: { chatPage.updateMessagelist() } background: Rectangle { color: Kirigami.Theme.alternateBackgroundColor anchors.fill: parent } ListView { id: messageListView anchors.fill: parent spacing: Kirigami.Units.largeSpacing model: messagelistModel /* * Messages are laid out bottom to top, because their height * is not known in advance. * * Attempts to lay out messages top to bottom and scroll to the * bottom of the list with ListView.positionViewAtEnd() result in * imprecise scrollbar position, because this method estimates * item height from the height of currently visible messages. */ verticalLayoutDirection: ListView.BottomToTop delegate: Message { message: chatPage.context.getMessage(msgId) context: chatPage.context width: ListView.view.width } } footer: ComposePane { context: chatPage.context chatId: chatPage.chatId Layout.fillWidth: true visible: chatPage.chat && chatPage.chat.canSend } }