<template>

<div class="widget-tabs" :class="stateClass" ref="widget">

<ul class\="heads"\>
 <li v-for\="tab in tabs" class\="item" :class\="{ 'active': tab.isShow }" @click\="click(tab)"\>
 <div v-show\="showIcon" class\="tab-icon"\><i :class\="tab.icon"\></i\></div\> 
 <span v-show\="showTitle"\> {{ tab.name }}</span\>
 </li\>
</ul\>
<div v-show\="showTabBody" class\="tab-body" :class\="dockLeft?'dock-left':''"\>
 <div v-show\="showTabTitle" class\="tab-title"\>
 <div\>{{selectedTab ? selectedTab.name : ''}}</div\>
 <div class\="tab-close" @click\="close"\>×</div\>
 </div\>
 <slot\></slot\>
</div\>
</div>

</template>

class State{

constructor(context){ this.context = context

}

widthChange(width){ if(width <=90){ this.toState(this.context.miniState)

} else if(width <=160){ this.toState(this.context.middleState)
} else{ this.toState(this.context.normalState)
}
}

showTabBody(){ return true }

showTabTitle(){ return false }

showIcon(){ return false }

showTitle(){ return true }

close(){}

toState(state){ if(this.context.state !== state){ if(this.context.state === this.context.normalState){ this.context.selectedTab.isShow = false console.log('dddd')

} if(state === this.context.normalState){ this.context.selectedTab.isShow = true } this.context.state = state
}
}

stateClass(){ return '' }

}

class NormalState extends State{

constructor(context){

super(context)
}

clickTab(clickedTab){ this.context.tabs.forEach(tab => {

tab.isShow \= (tab.name == clickedTab.name) this.context.selectedTab = clickedTab
});
}

} //需要彈出式顯示標(biāo)簽內(nèi)容

class ListState extends State{

constructor(context){

super(context)
}

showTabBody(){ return this.context.selectedTab.isShow

}

showTabTitle(){ return true }

showIcon(){ return true }

showTitle(){ return true }

close(){ this.context.selectedTab.isShow = false }

clickTab(clickedTab){ this.context.tabs.forEach(tab => { if(tab === clickedTab){

tab.isShow \= !tab.isShow this.context.selectedTab = clickedTab
 } else{
 tab.isShow \= false }
});
}

} //該狀態(tài)顯示圖標(biāo)跟標(biāo)題

class MiddleState extends ListState{

constructor(context){

super(context)
}

stateClass(){ return 'middle-size' }

} //該狀態(tài)只顯示圖標(biāo)

class MiniState extends ListState{

constructor(context){

super(context)
}

showTitle(){ return false }

stateClass(){ return 'mini-size' }

}

export default {

name: 'WidgetTabs',

data() { return {

tabs: \[\],
 state: null,
 selectedTab :null,
 dockLeft:false,
}
},

created() { this.tabs = this.$children; this.normalState = new NormalState(this) this.middleState = new MiddleState(this) this.miniState = new MiniState(this) this.state = this.normalState

},

computed: {

stateClass(){ return this.state.stateClass()
},

showIcon(){ return this.state.showIcon()
},

showTitle(){ return this.state.showTitle()
},

showTabBody(){ return this.state.showTabBody()
},
showTabTitle(){ return this.state.showTabTitle()
},
},

methods: {

click(clickTab) { this.state.clickTab(clickTab)
},

mouseMove(){ if(this.$refs.widget){ this.dockLeft = this.$refs.widget.offsetLeft < 50
 this.state.widthChange(this.$refs.widget.offsetWidth)
 }
},

mouseDown(event){
 document.addEventListener('mousemove', this.mouseMove)
},

mouseUp(event){
 document.removeEventListener('mousemove', this.mouseMove)
},

close(){ this.state.close()
}
},

mounted () {

document.addEventListener('mousedown', this.mouseDown)
document.addEventListener('mouseup', this.mouseUp) this.tabs.forEach(tab => { if(tab.isShow){ this.selectedTab = tab
 }
});
},

beforeDestroyed() {

document.removeEventListener('mousedown', this.mouseDown)
document.removeEventListener('mouseup', this.mouseUp)
},

}