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nwui.go
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/*
Copyright 2015 Bluek404
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package nwui
import (
"encoding/json"
"fmt"
"io"
"log"
"math/rand"
"net"
"net/http"
"os"
"reflect"
"strconv"
"time"
"github.com/gorilla/websocket"
)
var (
// 用于生成随机数
r = rand.New(rand.NewSource(time.Now().UnixNano()))
cons = make(map[string]interface{})
temp = `<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>%v</title>
<style>%v</style>
</head>
<body>
%v
<script>
var wsURL = "ws://%v/ws";
var socket = new WebSocket(wsURL);
socket.onmessage = function(evt) {
var data = JSON.parse(evt.data);
eval(data["event"]+"('"+data["id"]+"','"+data["value"]+"')");
}
function send(id, event, value) {
socket.send(JSON.stringify({"id":id, "event": event, "value": value}));
}
%v
</script>
</body>
</html>`
)
func printInfo(v ...interface{}) {
log.Println(append([]interface{}{"[nwui][Info]"}, v...)...)
}
func printError(v ...interface{}) {
log.Println(append([]interface{}{"[nwui][Error]"}, v...)...)
}
// 生成控件ID
func NewControlID() string { return "_" + strconv.FormatInt(r.Int63(), 36) }
func GetConByID(id string) interface{} { return cons[id] }
// 显示窗口
// 必须在全部控件设置完毕后才能调用
func Show(window interface{}) {
// 查找可用端口
var port string
for i := 7072; i <= 65536; i++ {
p := strconv.Itoa(i)
ln, err := net.Listen("tcp", "localhost:"+p)
if err != nil {
continue
} else {
port = p
ln.Close()
break
}
}
if port == "" {
printError("no port can use")
os.Exit(1)
}
var (
html string
css string
js string
events = make(map[string]func(v string))
upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
sender = make(chan EventMsg)
x = make(map[string]bool)
)
vv := reflect.ValueOf(window).MethodByName("Init").Call([]reflect.Value{reflect.ValueOf(sender)})
vvv := vv[0].Interface().(Controls)
for id, con := range vvv {
if _, ok := x[con.Static.Name]; !ok {
css += con.Static.CSS
js += con.Static.JavaScript
x[con.Static.Name] = true
}
cons[id] = con.V
html += con.HTML
for event, f := range con.Events {
events[id+event] = f
}
}
nwui := vv[1].Interface().(NWUI)
exit := vv[2].Interface().(chan bool)
http.HandleFunc("/", func(rw http.ResponseWriter, r *http.Request) {
fmt.Fprintf(rw, temp, nwui.Name, css, html, "localhost:"+port, js)
r.Body.Close()
})
http.HandleFunc("/ws", func(rw http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(rw, r, nil)
if err != nil && err != io.EOF {
printError(err)
return
}
// 用于接收事件
go func() {
for {
messageType, p, err := conn.ReadMessage()
if err != nil {
printError(err)
return
}
if messageType == websocket.TextMessage {
var msg EventMsg
err = json.Unmarshal(p, &msg)
if err != nil {
printError(err)
return
}
// 执行事件所绑定的函数
f, ok := events[msg.ID+msg.Event]
if ok {
f(msg.Value)
}
}
}
}()
for {
// 发送消息给前端
m := <-sender
msg, err := json.Marshal(&m)
if err != nil {
printError(err)
return
}
err = conn.WriteMessage(websocket.TextMessage, msg)
if err != nil {
printError(err)
}
}
})
go func() {
printInfo("running on localhost:" + port)
err := http.ListenAndServe("localhost:"+port, nil)
if err != nil {
panic(err)
}
}()
<-exit
}
// TODO: 移植自定义窗口控件
// TODO: 分离nwui框架和控件
// TODO: 更多控件+主题
// TODO: 自动启动nwjs
// nwui窗口
type Window struct {
Title string
Width int
Height int
MaxWidth int
MaxHeight int
MinWidth int
MinHeight int
Controls []interface{}
OnExit func()
exit chan bool
}
func (w *Window) Init(sender chan EventMsg) (Controls, NWUI, chan bool) {
w.exit = make(chan bool)
var (
id = NewControlID()
cons = Controls{
id: Control{
Events: map[string]func(v string){"exit": func(v string) {
if w.OnExit != nil {
w.OnExit()
}
w.exit <- true
return
}},
Static: ConStatic{
Name: "Window",
JavaScript: `
window.onunload = function() {
send("` + id + `", "exit", "");
}`,
},
},
}
x = make(map[string]bool)
)
// 初始化控件
for _, v := range w.Controls {
// 返回html string, javascript string, events map[string]func(v string)
vv := reflect.ValueOf(v).MethodByName("Init").Call([]reflect.Value{reflect.ValueOf(sender)})
vvv := vv[0].Interface().(Controls)
for id, con := range vvv {
// 检查ID是否重复
if _, ok := x[id]; ok {
panic("duplicate id: " + id)
}
cons[id] = con
}
}
return cons, NWUI{
Name: w.Title,
}, w.exit
}
/*
defaultTheme = `
.frame {
position: absolute;
left: 0px;
top: 0px;
width: 100%;
height: 32px;
background-color: #424242;
-webkit-app-region: drag;
}
.frame .title {
color: white;
position: absolute;
left: 12px;
width: 80%;
margin-top: 6px;
margin-bottom: 6px;
font-size: 11pt;
}
.frame button#close {
position: absolute;
left: auto;
right: 12px;
width: auto;
font-size: 11pt;
-webkit-app-region: no-drag;
}
.main {
margin-top: 40px;
}`
// 创建一个新的自定义窗口边框
// 一个 Window 中只能有一个 Frame
func NewFrame(title string, con ...Control) Frame {
return &frame{
title: title,
controls: con,
events: make(map[string]func(v string)),
}
}
// 窗口边框
type Frame interface {
Control
}
type frame struct {
title string
js string
controls []Control
events map[string]func(v string)
send func(f, v string)
}
func (f *frame) getEvents() map[string]func(v string) {
return f.events
}
func (f *frame) setSendFunc(fc func(f, v string)) {
f.send = fc
}
func (f *frame) genHTML() string {
// 转换内部控件
var html string
for _, v := range f.controls {
v.setSendFunc(f.send)
html += v.genHTML()
f.js += v.genJavaScript()
for e, fc := range v.getEvents() {
f.events[e] = fc
}
}
return `<div class="frame">
<a class="title">` + f.title + `</a>
<button id="close">x</button>
</div>
<div class="main">
` + html + `
</div>`
}
func (f *frame) genJavaScript() string {
return f.js + `
(function() {
document.getElementById("close").onclick = function(){
open(' ', '_self').close();
}
})();`
}
*/
type Button struct {
ID string
Text string
OnClick func()
sender chan EventMsg
}
func (b *Button) Init(sender chan EventMsg) Controls {
static := ConStatic{
Name: "Button",
CSS: `
.button {
border: 4px solid #304ffe;
color: white;
background: #304ffe;
padding: 6px 12px;
}
.button:hover {
background: white;
color: #304ffe;
}
.button:active {
color: #fff;
background: #304ffe;
box-shadow: 1px 2px 7px rgba(0, 0, 0, 0.3) inset;
}`,
JavaScript: `
function ButtonSetText(id,text) {
var button = document.getElementById(id);
button.textContent = text;
}
(function() {
var buttons = document.getElementsByClassName('button');
for (var i = 0; i < buttons.length; i++) {
var button = buttons[i]
button.onclick = function(){
send(button.id, "ButtonOnClick", "");
};
}
})();`,
}
if b.ID == "" {
b.ID = NewControlID()
}
events := make(map[string]func(v string))
b.sender = sender
html := "<button id=\"" + b.ID + "\"class=\"button\">" + b.Text + "</button>"
if b.OnClick != nil {
// 如果用户使用了OnClick事件
// 那么添加事件
events["ButtonOnClick"] = func(v string) {
b.OnClick()
}
}
return Controls{
b.ID: Control{
V: b,
HTML: html,
Static: static,
Events: events,
},
}
}
// 设置按钮文字
func (b *Button) SetText(text string) {
// 这里的判断是防止控件还没有初始化
// sender还未赋值用户就调用
if b.sender != nil {
// ButtonSetText 为需要调用的js函数
b.sender <- EventMsg{b.ID, "ButtonSetText", text}
}
b.Text = text
}
type Controls map[string]Control
type Control struct {
V interface{} // 控件的结构体指针，用于初始化时的处理
HTML string // 控件的HTML代码
Events map[string]func(v string) // 控件事件列表，key为事件名称
Static ConStatic // 控件的静态数据，css和js等
}
type ConStatic struct {
Name string // 控件名称，不能和其他控件重复
CSS string // 控件的css
JavaScript string // 控件的js
}
type EventMsg struct {
ID string `json:"id"` // 控件的ID
Event string `json:"event"` // 事件名称
Value string `json:"value"` // 想发送信息的内容，复杂内容推荐用json编码
}
type NWUI struct {
Name string `json:"name"`
Main string `json:"main"`
Window NWUIWindow `json:"window"`
}
type NWUIWindow struct {
Show bool `json:"show"`
Toolbar bool `json:"toolbar"`
Position string `json:"position"`
Width int `json:"width"`
Height int `json:"height"`
MinWidth int `json:min_width`
MinHeight int `json:"min_height"`
MaxWidth int `json:max_width`
MaxHeight int `json:"max_height"`
}