kivyblocks/kivyblocks/paging.py
2020-04-29 10:43:38 +08:00

326 lines
7.1 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
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.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
def getLocater(self):
if self.newbegin:
self.newbegin = False
return 1
x = 1 / self.MaxbufferPage
if self.dir != 'down':
x = 1 - x
print('getLocater(),x=%f,dir=%s,self.curpage=%d' % (x,self.dir,self.curpage))
return x
def on_newbegin(self):
pass
def on_pageloaded(self,d):
"""
d={
page:
data:[]
dir:'up' or 'down'
}
"""
pass
def do_search(self,o,params):
print('PageLoader().do_search(), on_submit handle....',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 httperror(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 not self.url:
raise Exception('dataurl must be present:options=%s' % str(options))
if self.curpage > p:
self.dir = 'up'
elif self.curpage == p:
self.dir = 'reload'
else:
self.dir = 'down'
self.curpage = p
self.loading = True
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 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
print('buffer pages=',len(self.objectPages.keys()),'pages=',self.objectPages.keys())
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:
print('return not loading')
return
self.loadPage(1)
def loadPreviousPage(self,o=None):
if self.curpage < 2:
print('return not loading')
return
self.loadPage(self.curpage-1)
def loadNextPage(self,o=None):
if self.curpage >= self.total_page:
print('return not loading')
return
self.loadPage(self.curpage+1)
def loadLastPage(self,o=None):
if self.curpage >= self.total_page:
print('return not loading')
return
self.loadPage(self.total_page)
class OneRecordLoader(PageLoader):
def __init__(self,**options):
PageLoader.__init__(self,**options)
self.adder = options.get('adder')
self.page_rows = 1
def calculateTotalPage(self):
self.total_page = self.total_cnt
def show_page(self,o,d):
self.adder(d['rows'][0])