阶段性提交

internal/web/actions/actionutils/page.go

@@ -0,0 +1,161 @@
+package actionutils
+
+import (
+	"github.com/iwind/TeaGo/actions"
+	"math"
+	"net/url"
+	"strconv"
+	"strings"
+)
+
+type Page struct {
+	Offset  int // 开始位置
+	Size    int // 每页显示数量
+	Current int // 当前页码
+	Max     int // 最大页码
+	Total   int // 总数量
+
+	Path  string
+	Query url.Values
+}
+
+func NewActionPage(actionPtr actions.ActionWrapper, total int, size int) *Page {
+	action := actionPtr.Object()
+	currentPage := action.ParamInt("page")
+
+	paramSize := action.ParamInt("pageSize")
+	if paramSize > 0 {
+		size = paramSize
+	}
+
+	if size <= 0 {
+		size = 10
+	}
+
+	page := &Page{
+		Current: currentPage,
+		Total:   total,
+		Size:    size,
+		Path:    action.Request.URL.Path,
+		Query:   action.Request.URL.Query(),
+	}
+	page.calculate()
+	return page
+}
+
+func (this *Page) calculate() {
+	if this.Current < 1 {
+		this.Current = 1
+	}
+	if this.Size <= 0 {
+		this.Size = 10
+	}
+
+	this.Offset = this.Size * (this.Current - 1)
+	this.Max = int(math.Ceil(float64(this.Total) / float64(this.Size)))
+}
+
+func (this *Page) AsHTML() string {
+	if this.Total <= this.Size {
+		return ""
+	}
+
+	result := []string{}
+
+	// 首页
+	if this.Max > 0 {
+		result = append(result, `<a href="`+this.composeURL(1)+`">首页</a>`)
+	} else {
+		result = append(result, `<a>首页</a>`)
+	}
+
+	// 上一页
+	if this.Current <= 1 {
+		result = append(result, `<a>上一页</a>`)
+	} else {
+		result = append(result, `<a href="`+this.composeURL(this.Current-1)+`">上一页</a>`)
+	}
+
+	// 中间页数
+	before5 := this.max(this.Current-5, 1)
+	after5 := this.min(before5+9, this.Max)
+
+	if before5 > 1 {
+		result = append(result, `<a>...</a>`)
+	}
+
+	for i := before5; i <= after5; i++ {
+		if i == this.Current {
+			result = append(result, `<a href="`+this.composeURL(i)+`" class="active">`+strconv.Itoa(i)+`</a>`)
+		} else {
+			result = append(result, `<a href="`+this.composeURL(i)+`">`+strconv.Itoa(i)+`</a>`)
+		}
+	}
+
+	if after5 < this.Max {
+		result = append(result, `<a>...</a>`)
+	}
+
+	// 下一页
+	if this.Current >= this.Max {
+		result = append(result, "<a>下一页</a>")
+	} else {
+		result = append(result, `<a href="`+this.composeURL(this.Current+1)+`">下一页</a>`)
+	}
+
+	// 尾页
+	if this.Max > 0 {
+		result = append(result, `<a href="`+this.composeURL(this.Max)+`">尾页</a>`)
+	} else {
+		result = append(result, `<a>尾页</a>`)
+	}
+
+	// 每页数
+	result = append(result, `<select class="ui dropdown" style="height:34px;padding-top:0;padding-bottom:0;margin-left:1em;color:#666" onchange="ChangePageSize(this.value)">
+	<option value="10">[每页]</option>`+this.renderSizeOption(10)+
+		this.renderSizeOption(20)+
+		this.renderSizeOption(30)+
+		this.renderSizeOption(40)+
+		this.renderSizeOption(50)+
+		this.renderSizeOption(60)+
+		this.renderSizeOption(70)+
+		this.renderSizeOption(80)+
+		this.renderSizeOption(90)+
+		this.renderSizeOption(100)+`
+</select>`)
+
+	return `<div class="page">` + strings.Join(result, "") + `</div>`
+}
+
+// 判断是否为最后一页
+func (this *Page) IsLastPage() bool {
+	return this.Current == this.Max
+}
+
+func (this *Page) composeURL(page int) string {
+	this.Query["page"] = []string{strconv.Itoa(page)}
+	return this.Path + "?" + this.Query.Encode()
+}
+
+func (this *Page) min(i, j int) int {
+	if i < j {
+		return i
+	}
+	return j
+}
+
+func (this *Page) max(i, j int) int {
+	if i < j {
+		return j
+	}
+	return i
+}
+
+func (this *Page) renderSizeOption(size int) string {
+	o := `<option value="` + strconv.Itoa(size) + `"`
+	if size == this.Size {
+		o += ` selected="selected"`
+	}
+	o += `>` + strconv.Itoa(size) + `条</option>`
+	return o
+}