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Pagination2.qml
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import QtQuick 2.12
import QtQuick.Controls 2.12
//自定义分页组件
//龚建波 2020-12-19
//1.负责页码展示和发送翻页请求，实际页码计算由后端or业务逻辑进行
//每次请求返回后根据计算好的页码设置值，pageCurrent、itemCount
//2.可以在返回之前ui先根据之前的参数计算用于展示，但要注意绑定关系
//实现中我对pageCurrent直接赋值，要绑定需要加Connections
Rectangle {
id: control
//请求某一页
//page: 页码
//count: 一页总数
signal requestPage(int page,int count)
//需求中要展示的信息：数据总条数，每页条数，当前页，页跳转
//当前页
property int pageCurrent: 0
//数据总数
property int itemCount: 0
//总页数
property int pageCount: itemCount>0?Math.ceil(itemCount/__itemPerPage):0
//每页条数，这个和box关联的，暂时默认初始化
property int __itemPerPage: 20
//页码按钮显示个数
property int pageButtonCount: 5
property int __pageButtonHalf: Math.floor(pageButtonCount/2)+1
property font font
font{
pixelSize: 14
family: "Microsoft YaHei"
}
property color textColor: "#666666"
property color highlightedColor: "#1989FA"
property color elementBorderColor: "#DCDFE6"
property int elementHeight: 30
property alias padding: content_row.padding
//color: "transparent"
//border.color: "gray"
//radius: 4
implicitHeight: 40
implicitWidth: content_row.width
Row{
id: content_row
height: control.height
spacing: 25
padding: 10
//总条数
Text{
anchors.verticalCenter: parent.verticalCenter
font: control.font
color: control.textColor
text: "共 "+control.itemCount+" 条"
}
//每页多少条
Row{
spacing: 5
anchors.verticalCenter: parent.verticalCenter
Text{
anchors.verticalCenter: parent.verticalCenter
font: control.font
color: control.textColor
text: "每页"
}
ComboBox{
id: item_page_box
width: 90
height: control.elementHeight
model: [10,20,50,100]
currentIndex: 1
font: control.font
onCurrentIndexChanged: {
//选择每页数后重新请求数据
//currentText此时还未修改
//设置页码后从1开始
control.__itemPerPage=model[currentIndex];
control.pageCurrent=1;
control.requestPage(control.pageCurrent,control.__itemPerPage);
}
}
Text{
anchors.verticalCenter: parent.verticalCenter
font: control.font
color: control.textColor
text: "条"
}
}
//页码按钮
Row{
spacing: 5
anchors.verticalCenter: parent.verticalCenter
//左侧前一页，应该使用图片，这里仅作演示
PageButton{
visible: control.pageCount>1
enabled: control.pageCurrent>1
anchors.verticalCenter: parent.verticalCenter
width: 30
height: 30
font: control.font
textColor: control.textColor
highlightedColor: control.highlightedColor
text: "<"
onClicked: {
control.calcNewPage(control.pageCurrent-1);
}
}
//中间显示页码
Row{
spacing: 5
anchors.verticalCenter: parent.verticalCenter
//第一页
PageButton{
visible: control.pageCount>0
width: 30
height: control.elementHeight
font: control.font
textColor: control.textColor
highlightedColor: control.highlightedColor
pageNumber: 1
pageCurrent: control.pageCurrent
onClicked: {
control.calcNewPage(1);
}
}
Text {
//pageCount<btnCount不用显示
//当前页在前countHalf页不用显示
visible: (control.pageCount>control.pageButtonCount&&
control.pageCurrent>control.__pageButtonHalf)
text: "..."
font: control.font
color: control.textColor
height: control.elementHeight
}
//中间的页码由Repeater根据设置的pageButtonCount创建
Repeater{
id: button_repeator
model: (control.pageCount<2)
?0
:(control.pageCount>=control.pageButtonCount)
?(control.pageButtonCount-2)
:(control.pageCount-2)
delegate: PageButton{
width: 30
height: control.elementHeight
font: control.font
textColor: control.textColor
highlightedColor: control.highlightedColor
//在首或者尾相连时，值要连续，避免和首尾重复
pageNumber: (control.pageCurrent<=control.__pageButtonHalf)
?(2+index)
:(control.pageCount-control.pageCurrent<=control.pageButtonCount-control.__pageButtonHalf)
?(control.pageCount-button_repeator.count+index)
:(control.pageCurrent+2+index-control.__pageButtonHalf)
pageCurrent: control.pageCurrent
onClicked: {
control.calcNewPage(pageNumber);
}
}
}
Text {
id: page_moreright
//pageCount<btnCount不用显示
//当前页在倒数countHalf页不用显示
visible: (control.pageCount>control.pageButtonCount&&
control.pageCount-control.pageCurrent>control.pageButtonCount-control.__pageButtonHalf)
text: "..."
font: control.font
color: control.textColor
height: control.elementHeight
}
//最后一页
PageButton{
visible: control.pageCount>1
width: 30
height: control.elementHeight
font: control.font
textColor: control.textColor
highlightedColor: control.highlightedColor
pageNumber: control.pageCount
pageCurrent: control.pageCurrent
onClicked: {
control.calcNewPage(pageNumber);
}
}
}
//右侧下一页，应该使用图片，这里仅作演示
PageButton{
visible: control.pageCount>1
enabled: control.pageCurrent<control.pageCount
anchors.verticalCenter: parent.verticalCenter
width: 30
height: 30
font: control.font
textColor: control.textColor
highlightedColor: control.highlightedColor
text: ">"
onClicked: {
control.calcNewPage(control.pageCurrent+1);
}
}
}
//页码跳转
Row{
spacing: 5
anchors.verticalCenter: parent.verticalCenter
Text{
anchors.verticalCenter: parent.verticalCenter
font: control.font
color: control.textColor
text: "前往"
}
TextField{
id: edit_goto_page
width: 60
height: control.elementHeight
text: "1"
font: control.font
color: control.textColor
validator: IntValidator{
bottom: 0
top: 999999
}
selectByMouse: true
selectedTextColor: "white"
selectionColor: "blue"
background: Rectangle{
border.color: control.elementBorderColor
}
Keys.onPressed: {
//enter小键盘enter
//return主键盘enter
if(event.key===Qt.Key_Enter||event.key===Qt.Key_Return){
focus=false;
if(edit_goto_page.text){
//编辑结束就去请求该页数据
control.requestPage(Number(edit_goto_page.text),control.__itemPerPage);
}
}
}
}
Text{
anchors.verticalCenter: parent.verticalCenter
font: control.font
color: control.textColor
text: "页"
}
}
}
//翻页计算
function calcNewPage(page)
{
if(!page)
return;
let page_num=Number(page);
//超出范围或者为当前页就返回
if(page_num<1||page_num>control.pageCount||page_num===control.pageCurrent)
return;
control.pageCurrent=page_num;
control.requestPage(page_num,control.__itemPerPage)
}
}