使用qt quick-ListView仿微信好友列表和聊天列表的示例代碼
1.視圖模型介紹
在Qml中、常見的View視圖有:
- ListView: 列表視圖,視圖中數(shù)據(jù)來自ListModel、XmlListModel或c++中繼承自QAbstractItemModel或QAbstractListModel的自定義模型類
- TableView: 和excel類似的視圖
- GridView: 網(wǎng)格視圖,類似于home菜單那樣,排列著一個(gè)個(gè)app小圖標(biāo)
- PathView: 路徑視圖,可以根據(jù)用戶自定義的path路徑來顯示不一樣的視圖效果
- SwipeView: 滑動(dòng)視圖,使用一組頁(yè)面填充。每次只顯示一個(gè)頁(yè)面。用戶可以通過橫向滑動(dòng)在頁(yè)面之間導(dǎo)航,一般會(huì)將它與PageIndicator結(jié)合使用
本章首先來學(xué)習(xí)ListView.以微信好友列表為例:
里面的每個(gè)好友就是由一個(gè)個(gè) item 組成的,存在視圖中的model里,然后寫一個(gè)delegate組件,即可通過ListView顯示出來.
由于時(shí)間不是很多,所以本章實(shí)現(xiàn)的微信好友列表和聊天列表(v1版本)是通過模擬數(shù)據(jù)實(shí)現(xiàn)的,等后面有時(shí)間后,再來實(shí)現(xiàn)個(gè)一個(gè)真正的內(nèi)網(wǎng)聊天工具.
2.demo實(shí)現(xiàn)(支持自適應(yīng))
好友列表如下圖所示:
聊天列表如下圖所示:
整個(gè)效果如下所示:
覺得GIF模糊的話,可以轉(zhuǎn)彎去bilibilihttps://www.bilibili.com/video/BV1Z64y1R7kL/
由于代碼上傳CSDN,會(huì)導(dǎo)致有些同學(xué)可能沒積分無法下載,所以已經(jīng)上傳群里了.
如果下載后學(xué)習(xí)有收獲,一定要來這里給我點(diǎn)個(gè)贊呀,都沒動(dòng)力更新文章了,贊的人太少了
3.重要組件-實(shí)現(xiàn)氣泡組件源碼
import QtQuick 2.0 import "BubbleNormal.js" as BubbleNormal import "BubbleBlue.js" as BubbleBlue import "BubbleBlack.js" as BubbleBlack Item { id: container property var bubbleIndex: 0 property string msgText: "" property bool isSend: true property int iconHeight: 40 property int maxWidth: 100 Canvas { id: canvas anchors.fill: parent onPaint: { bubble().drawBubble(getContext('2d')); } } Text { id: text text: msgText font.pixelSize: 17 font.family: "Microsoft Yahei" wrapMode: Text.WrapAnywhere horizontalAlignment: Text.AlignLeft verticalAlignment: Text.AlignVCenter anchors.fill: parent } Component.onCompleted: { bubble().initText(); bubble().reUpdateSize(); canvas.requestPaint(); } onBubbleIndexChanged: { bubble().initText(); bubble().reUpdateSize(); canvas.requestPaint(); } function bubble() { switch (bubbleIndex) { case 0 : return BubbleNormal case 1 : return BubbleBlue case 2 : return BubbleBlack default: return BubbleNormal } } }
代碼如上所示,只要用戶更改了bubbleIndex值,那么我們就會(huì)去馬上調(diào)用替換后對(duì)應(yīng)的氣泡js文件的function(),進(jìn)行初始化消息、重繪氣泡背景。這個(gè)組件實(shí)現(xiàn)后,我們?nèi)绻雽?shí)現(xiàn)其它的氣泡,也可以直接往里加就好了
4.重要組件-實(shí)現(xiàn)聊天列表委托源碼
/**************************************************************************** ** 聊天列表委托 ** Author: 諾謙 https://www.cnblogs.com/lifexy/ ** Create: 2021-6-12 ****************************************************************************/ import QtQuick 2.12 import QtGraphicalEffects 1.12 import "./bubble" as Bubble import "qrc:/Common.js" as Common Item { id: container property var headSrc property var myHeadSrc : "qrc:/head/myhead.jpg" property var bubbleIndex : 0 height: _layout.height + 10 width: ListView.view.width state: msgType states: [ State { name: "hint" AnchorChanges { target: _layout; anchors.horizontalCenter: container.horizontalCenter; anchors.verticalCenter: container.verticalCenter; } }, State { name: "hintDate" AnchorChanges { target: _layout; anchors.horizontalCenter: container.horizontalCenter; anchors.verticalCenter: container.verticalCenter; } }, State { name: "recv" AnchorChanges { target: _layout; anchors.left: container.left; anchors.verticalCenter: container.verticalCenter; } }, State { name: "send" AnchorChanges { target: _layout; anchors.right: container.right; anchors.verticalCenter: container.verticalCenter; } } ] Row { id: _layout anchors.leftMargin: 20 anchors.rightMargin: 20 spacing: 4 layoutDirection : msgType == "send" ? Qt.RightToLeft : Qt.LeftToRight HeadImage { id: _head width : 50 height : 50 headUrl: msgType == "recv" ? headSrc : myHeadSrc visible: msgType == "recv" || msgType == "send" } Text { id: _hint visible: msgType == "hintDate" || msgType == "hint" text: msgType == "hintDate" ? getChatDate() : msg color: "#B0B0B0" font.pixelSize: 14 font.family: "Microsoft Yahei" wrapMode: Text.WrapAnywhere elide: Text.ElideRight width: container.width - 40 height: 30 horizontalAlignment: Text.AlignHCenter verticalAlignment: Text.AlignVCenter } Bubble.ChatBubble { id: _msg visible: msgType == "recv" || msgType == "send" msgText: msgType == "recv" || msgType == "send" ? msg : "" isSend: msgType == "send" ? true : false iconHeight: _head.height maxWidth: container.width - _layout.anchors.leftMargin * 2 - _head.width * 2 - _layout.spacing * 2 bubbleIndex: container.bubbleIndex } } // 判斷消息時(shí)間,與當(dāng)前時(shí)間間隔多久,來動(dòng)態(tài)顯示 function getChatDate () { var total = new Date() - date; if (total < (1000*60*60*24)) { return date.toLocaleTimeString(Qt.locale(), "hh:mm"); } else if (total < (1000*60*60*24) * 2) { return "昨天 "+date.toLocaleTimeString(Qt.locale(), "hh:mm"); } else if (total < (1000*60*60*24) * 3) { return "前天 "+date.toLocaleTimeString(Qt.locale(), "hh:mm"); } else { return date.toLocaleString(Qt.locale(), "yyyy年M月d日 hh:mm"); } } }
代碼如上所示,我們會(huì)去判斷消息類型:
- 如果消息類型是"hint"類型,就直接居中顯示。
- 如果消息類型是"hintDate"類型,則調(diào)用getChatDate()來動(dòng)態(tài)獲取要如何顯示時(shí)間.
- 如果消息類型是"recv"類型,則靠左顯示對(duì)方頭像,并加上氣泡消息
- 如果消息類型是"send"類型,則靠又顯示自己頭像,并加上氣泡消息
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