kivyblocks/kivyblocks/paging.py
2020-09-19 09:08:04 +08:00

323 lines
6.9 KiB
Python

import traceback
import math
from kivy.logger import Logger
from kivy.event import EventDispatcher
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.clock import Clock
from kivy.app import App
from functools import partial
from appPublic.dictObject import DictObject
from appPublic.jsonConfig import getConfig
from .baseWidget import Text, HTTPDataHandler
from .utils import CSize, absurl, alert
from .form import StrSearchForm
from .dataloader import HttpDataLoader
from .dataloader import ListDataLoader
from .dataloader import RegisterFunctionDataLoader
class PagingButton(Button):
def __init__(self, **kw):
super().__init__(**kw)
self.size_hint = (None,None)
self.size = CSize(2,1.8)
self.font_size = CSize(1)
"""
{
dataurl
params
method
locater
filter
}
PageLoader load data in a page size once.
it fires two type of event
'on_newbegin':fire when start a new parameters loading series
'on_pageloaded':fire when a page data loads success
"""
class PageLoader(EventDispatcher):
def __init__(self,target=None, **options):
self.loading = False
self.target = target
self.options = options
self.filter = None
if options.get('filter'):
self.filter = StrSearchForm(**options['filter'])
self.filter.bind(on_submit=self.do_search)
self.params = options.get('params',{})
self.method = options.get('method','GET')
self.url = options.get('dataurl')
self.rfname = options.get('rfname')
self.data = options.get('data')
self.page_rows = options.get('page_rows',60)
self.total_cnt = 0
self.total_page = 0
self.curpage = 0
self.dir = 'down'
self.register_event_type('on_newbegin')
self.register_event_type('on_pageloaded')
self.newbegin = True
if self.url:
self.loader = HttpDataLoader(self)
elif self.rfname:
self.loader = RegisterFunctionDataLoader(self)
elif self.data:
self.loader = ListDataLoader(self)
else:
raise Exception('need a url or rfname or data')
self.loader.bind(on_success=self.show_page)
self.loader.bind(on_error=self.onerror)
def on_newbegin(self):
pass
def on_pageloaded(self,d):
"""
d={
page:
data:[]
dir:'up' or 'down'
}
"""
pass
def do_search(self,o,params):
self.newbegin = True
self.dispatch('on_newbegin')
self.params.update(params)
self.loadPage(1)
def calculateTotalPage(self):
self.total_page = math.floor(self.total_cnt / self.page_rows)
if self.total_cnt % self.page_rows != 0:
self.total_page += 1
def setPageRows(self,row_cnt):
if row_cnt == 0:
return
self.page_rows = row_cnt
if self.total_cnt != 0:
self.calculateTotalPage()
self.reload()
def reload(self):
if self.curpage == 0:
self.curpage = 1
self.loadPage(self.curpage)
def show_page(self,o,d):
p = (self.curpage - 1) * self.page_rows + 1
for r in d['rows']:
r['__posInSet__'] = p
p += 1
self.total_cnt = d['total']
self.calculateTotalPage()
d = {
"page":self.curpage,
"dir":self.dir,
"data":d['rows']
}
self.dispatch('on_pageloaded',d)
def onerror(self,o,e):
traceback.print_exc()
alert(str(e),title='alert')
def loadNextPage(self):
if self.total_page > 0 and self.curpage >=self.total_page:
return
p = self.curpage + 1
self.loadPage(p)
def loadPreviousPage(self):
if self.curpage <= 1:
return
p = self.curpage - 1
self.loadPage(p)
def loadPage(self,p):
if self.curpage > p:
self.dir = 'up'
elif self.curpage == p:
self.dir = 'reload'
else:
self.dir = 'down'
self.curpage = p
self.loading = True
self.loader.load()
"""
params = self.params.copy()
params.update({
"page":self.curpage,
"rows":self.page_rows
})
realurl = absurl(self.url,self.target.parenturl)
loader = HTTPDataHandler(realurl,params=params)
loader.bind(on_success=self.show_page)
loader.bind(on_failed=self.httperror)
loader.handle()
"""
"""
{
adder,
remover
target,
locater,
dataurl,
params,
method,
filter
}
events:
'on_deletepage': erase
"""
class RelatedLoader(PageLoader):
def __init__(self, **options):
super().__init__(**options)
self.objectPages = {}
self.totalObj = 0
self.MaxbufferPage = 3
self.locater = 1/self.MaxbufferPage
if self.filter:
self.widget = self.filter
else:
self.widget = None
self.register_event_type('on_deletepage')
def getLocater(self):
if self.newbegin:
self.newbegin = False
return 1
x = 1 / self.MaxbufferPage
if self.dir != 'down':
x = 1 - x
return x
def on_deletepage(self,d):
pass
def setPageRows(self,row_cnt):
if self.total_cnt != 0:
self.calculateTotalPage()
self.reload()
def doBufferMaintain(self):
siz = len(self.objectPages.keys())
if siz >= self.MaxbufferPage:
if self.dir == 'up':
p = max(self.objectPages.keys())
else:
p = min(self.objectPages.keys())
self.deleteBuffer(p)
def deleteBuffer(self,page):
d = self.objectPages[page]
self.dispatch('on_deletepage',d)
self.totalObj -= len(self.objectPages[page])
del self.objectPages[page]
def bufferObjects(self,objects):
self.objectPages[self.curpage] = objects
def show_page(self,o,data):
if self.objectPages.get(self.curpage):
self.deleteBuffer(self.curpage)
else:
self.doBufferMaintain()
self.totalObj += len(data['rows'])
super().show_page(o,data)
self.loading = False
def loadPreviousPage(self):
if self.loading:
return
pages = self.objectPages.keys()
if len(pages) < 1:
return
page = min(pages)
if page <= 1:
return
page -= 1
self.loadPage(page)
def loadNextPage(self):
if self.loading:
return
pages = self.objectPages.keys()
if len(pages) == 0:
return
page = max(pages)
if page>=self.total_page:
return
page += 1
self.loadPage(page)
"""
{
adder,
clearer
target,
dataurl
params,
method
}
"""
class Paging(PageLoader):
def __init__(self,**options):
PageLoader.__init__(self,**options)
self.target = options.get('target')
self.init()
def init(self):
kwargs = {}
kwargs['size_hint_y'] = None
kwargs['height'] = CSize(2)
kwargs['orientation'] = 'horizontal'
kwargs['spacing'] = CSize(1)
self.widget = BoxLayout(**kwargs)
self.b_f = PagingButton(text="|<")
self.b_p = PagingButton(text="<")
self.b_n = PagingButton(text=">")
self.b_l = PagingButton(text=">|")
self.b_f.bind(on_press=self.loadFirstPage)
self.b_p.bind(on_press=self.loadPreviousPage)
self.b_n.bind(on_press=self.loadNextPage)
self.b_l.bind(on_press=self.loadLastPage)
self.widget.add_widget(self.b_f)
self.widget.add_widget(self.b_p)
self.widget.add_widget(self.b_n)
self.widget.add_widget(self.b_l)
if self.filter:
self.widget.add_widget(self.filter)
def loadFirstPage(self,o=None):
if self.curpage == 1:
return
self.loadPage(1)
def loadPreviousPage(self,o=None):
if self.curpage < 2:
return
self.loadPage(self.curpage-1)
def loadNextPage(self,o=None):
if self.curpage >= self.total_page:
return
self.loadPage(self.curpage+1)
def loadLastPage(self,o=None):
if self.curpage >= self.total_page:
return
self.loadPage(self.total_page)