前几天课设做个聊天系统,顺便实现了这个在程序外显示弹幕作为消息提示的功能,这里记录一下怎么搞。
效果
思路
- 创建一个子窗口
- 将子窗口去掉窗口标题栏,设置背景透明
- 在里面放文本Text
- 设置定时器控制子窗口从左到右移动,移动到右边缘时销毁子窗口
实操
- 新建qml文件,这里示例 Barrage.qml
- 里面写入:
import QtQuick 2.3
import QtQuick.Controls 2.5
//窗口
ApplicationWindow {
id:root
property string str: "我的洛天依" //弹幕文本内容
width: 300
height: 40
flags: Qt.FramelessWindowHint //去掉窗口标题栏
color:"#00000000" //设置背景透明
Rectangle { //使用矩形包裹Text是为了在Text外面可以增加圆角矩形边框效果
anchors.fill: parent
border.width: 1 //设置边框
border.color: "#66ccff"
color:"#00000000"
radius: 20 //边框圆角
clip: true //超出矩形范围的内容隐藏
Text { //弹幕文本
anchors.fill: parent
text: str
font.bold: true
font.pointSize: 15
color: "#66ccff"
style: Text.Outline //设置文本样式,在字体轮廓加一层styleColor指定的颜色边缘,防止背景导致文本不明显
styleColor: "#fff"
horizontalAlignment: Text.AlignHCenter //居中
verticalAlignment: Text.AlignVCenter
clip: true
}
}
}
- 在需要调用的qml文件中,导入并按如下操作使用:
- 由于Barrage.qml和main.qml在同一目录下:
- 因此在main.qml中可以直接使用Barrage.qml
- 以下是 main.qml 的内容
import QtQuick
import QtQuick.Window 2.3
import QtQuick.Controls 2.5
Window {
id:mainWin
width: 700
height: 500
visible: true
title: qsTr("MimicryChat")
//添加弹幕
function addBarrage(in_str) {
var newCom = Qt.createComponent("Barrage.qml"); //创建弹幕窗口
var newWin = newCom.createObject();
newWin.x = 200;
newWin.y = Math.random() * 900; //随机竖直位置
newWin.str = in_str; //设置弹幕文本
newWin.show(); //显示弹幕窗口
//设置定时控制器
let timer = Qt.createQmlObject("import QtQuick 2.14; Timer {}", mainWin);
timer.interval = 20; //执行间隔时间(单位ms)
timer.repeat = true; //重复执行
timer.triggered.connect(function() { //执行内容
if(newWin.x < 1700) { //如果没到右边缘就移动2个像素点
newWin.x += 2;
} else {
timer.stop(); //到达右边缘,则停止定时控制器,并销毁弹幕
newWin.close();
}
});
timer.start(); //启动定时器
}
Rectangle { //主窗口背景颜色
anchors.fill: parent
color: "#dde8fc"
radius: 20
}
Button {
width:100
height: 40
text:"发送弹幕"
anchors.bottom: parent.bottom
anchors.bottomMargin: 10
//水平居中
anchors.horizontalCenter: parent.horizontalCenter
onClicked: {
addBarrage("嘿嘿,我的洛天依");
}
}
}
问题
- 这个弹幕会被其他高层次的窗口遮挡,显然问题在于我们创建的窗口不是顶层窗口,这个后面再看看咋整。
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