wxPython - 根据文本框输入动态更新列表控件
有没有人能给个例子，教我怎么做到以下这件事：
我有一个列表控件，里面显示了超过600个项目。现在我需要在这些项目中搜索用户输入的文本，并更新列表，只显示包含这个字符串的项目。
比如说，列表里有“Hello”、“Hi”和“Morning”。这时候列表会显示这三个项目。然后用户在文本框里输入“h”，列表就会缩小到“Hello”和“Hi”。如果用户输入的是“o”，那么列表就会变成“Hello”和“Morning”。
这可能吗？或者有没有其他方便的方法可以在列表控件中找到一个项目？内置的“输入时查找”功能只有在你确切知道要找什么的时候才有用，而在我的情况下，这并不适用……
谢谢，Woodpicker
4 个回答
1
这里有一个关于过滤UltimateListCtrl的例子。虽然我知道这已经是两年前的事了，但我在StackOverflow上找到的其他例子真的非常有帮助。我刚接触python和wxpython，希望这个例子对你们也有用。这个例子是从http://www.blog.pythonlibrary.org/2011/11/02/wxpython-an-intro-to-the-ultimatelistctrl/开始的。
import wx
from wx.lib.agw import ultimatelistctrl as ULC
class ULC_Panel(wx.Panel):
""""""
def __init__(self, parent, col_headers=None, list_data=None, options=None, dlg=None,
selected_list=None):
"""Constructor"""
wx.Panel.__init__(self, parent)
self.options = options
self.show_only_selected = False
self.filter_string = ""
hsizer = wx.BoxSizer(wx.HORIZONTAL)
okayButton = wx.Button(self, wx.ID_OK, "OK")
okayButton.SetToolTip(wx.ToolTip("Click to close this dialog and use the selections"))
self.Bind(wx.EVT_BUTTON, self.OnOkayCanButton, okayButton)
hsizer.Add(okayButton, 0, wx.ALL, 5)
canButton = wx.Button(self, wx.ID_CANCEL, "Cancel")
canButton.SetToolTip(wx.ToolTip("Click to close this dialog and cancel selections"))
self.Bind(wx.EVT_BUTTON, self.OnOkayCanButton, canButton)
hsizer.Add(canButton, 0, wx.ALL, 5)
cb_show_only = wx.CheckBox(self, -1, "Show only selected items?")
cb_show_only.SetValue(self.show_only_selected)
cb_show_only.SetToolTip(wx.ToolTip("Click to show only selected rows"))
self.Bind(wx.EVT_CHECKBOX, self.EvtShowOnly, cb_show_only)
hsizer.Add(cb_show_only, 0, wx.ALL, 5)
self.stext = wx.StaticText(self, -1, "Filter: ", style=wx.ALIGN_LEFT)
self.filtr = wx.TextCtrl(self, -1, "", style=wx.ALIGN_LEFT)
self.Bind(wx.EVT_TEXT, self.OnFiltr, self.filtr)
fsizer = wx.BoxSizer(wx.HORIZONTAL)
fsizer.Add(self.stext, 0, wx.ALL)
fsizer.Add(self.filtr, 1, wx.EXPAND)
font = wx.SystemSettings_GetFont(wx.SYS_DEFAULT_GUI_FONT)
boldfont = wx.SystemSettings_GetFont(wx.SYS_DEFAULT_GUI_FONT)
boldfont.SetWeight(wx.BOLD)
boldfont.SetPointSize(12)
self.ultimateList = ULC.UltimateListCtrl(self, agwStyle = wx.LC_REPORT
| wx.LC_VRULES | ULC.ULC_HAS_VARIABLE_ROW_HEIGHT
| wx.LC_HRULES)
self.checkbox = [None] * len(list_data)
if selected_list != None:
self.selected = selected_list
else:
self.selected = [False] * len(list_data)
self.rows_max = len(list_data)
self.rows_current = -1
self.cols_max = len(col_headers)
self.cols_extra = 1
if options & ULC.ULC_MASK_CHECK:
self.cols_extra += 1
for i in xrange(self.cols_max+self.cols_extra):
info = ULC.UltimateListItem()
info._mask = wx.LIST_MASK_TEXT | wx.LIST_MASK_IMAGE | wx.LIST_MASK_FORMAT
info._image = []
info._format = 0
info._kind = 1
width = 150
if i >= self.cols_extra:
info._text = col_headers[i-self.cols_extra]
elif i == 0:
info._text = "Row"
width = 35
elif i == 1 and options & ULC.ULC_MASK_CHECK:
info._text = "Select"
width = 50
self.ultimateList.InsertColumnInfo(i, info)
self.ultimateList.SetColumnWidth(i, width)
self.list_data = list_data
pos = self.populate_table("")
if pos != None:
self.sz = self.ultimateList.GetItemRect(pos)
self.width = self.sz[2] + self.sz[3]
self.height = self.sz[1]
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(hsizer, 0, wx.EXPAND)
sizer.Add(fsizer, 0, wx.EXPAND)
sizer.Add(self.ultimateList, 1, flag=wx.EXPAND)
self.SetSizer(sizer)
sizer.Fit(self)
def EvtShowOnly(self, event):
cb = event.GetEventObject()
val = cb.GetValue()
self.show_only_selected = val
pos = self.populate_table(self.filter_string)
print "show_only_selected val= ", val
def EvtCheckBox(self, event):
cb = event.GetEventObject()
id = event.GetId()
val = cb.GetValue()
self.selected[id] = val
print "id, val= ", id, val
def OnOkayCanButton(self, event):
id = event.GetId()
dlg.EndModal(id)
def myGetNeedWH(self):
return (self.width, self.height)
def myGetSelectedState(self):
return self.selected
def populate_table(self, str_in):
busy = wx.BusyCursor()
if str_in:
str_low = str_in.lower()
if self.options & ULC.ULC_MASK_CHECK:
# if we have widgets in the row then we have to delete 1 row
# at a time (or else it leaves some of the widgets)
i = self.rows_current
#print "i, self.rows_max= ", i, self.rows_max
while i >= 0:
#print "i= ", i
self.ultimateList.DeleteItem(i)
i -= 1
else:
self.ultimateList.DeleteAllItems()
row = -1
for i in xrange(len(self.list_data)):
tlwr = self.list_data[i][0].lower()
if not str_in or tlwr.find(str_low) >= 0:
if self.show_only_selected and self.selected[i] == False:
continue
row += 1
for j in xrange(self.cols_max+self.cols_extra):
if j == 0:
pos = self.ultimateList.InsertStringItem(row, str(row))
elif j == 1 and self.options & ULC.ULC_MASK_CHECK:
self.checkbox[i] = wx.CheckBox(self.ultimateList, id= i)
self.checkbox[i].SetValue(self.selected[i])
self.checkbox[i].SetToolTip(wx.ToolTip("Click to select this row"))
self.Bind(wx.EVT_CHECKBOX, self.EvtCheckBox, self.checkbox[i])
self.ultimateList.SetItemWindow(pos, col=1, wnd=self.checkbox[i], expand=False)
else:
self.ultimateList.SetStringItem(row, j, self.list_data[i][j-self.cols_extra])
self.rows_current = row
return row
def OnFiltr(self, event):
str1 = event.GetString()
id = event.GetId()
#print "got txt_tval str[%s]= %s" % (id, str1)
self.filter_string = str1
pos = self.populate_table(str1)
event.Skip()
return
########################################################################
class FilterListDiag(wx.Dialog):
def __init__(self, parent, id, title, headers=None, data_table=None, options=None, selected_list=None):
wx.Dialog.__init__(self, parent, id, title="", style=wx.DEFAULT_DIALOG_STYLE | wx.RESIZE_BORDER)
options_in = options
self.panel = ULC_Panel(self, col_headers=headers, list_data=data_table, options=options_in,
dlg=self, selected_list=selected_list)
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(self.panel, 1, wx.EXPAND)
self.SetSizer(sizer)
(self.width, self.height) = self.panel.myGetNeedWH()
def myGetNeedWH(self):
return (self.width, self.height)
def myGetSelectedState(self):
return self.panel.myGetSelectedState()
class TestFrame(wx.Frame):
def __init__(self):
"""Constructor"""
wx.Frame.__init__(self, None, title="MvP UltimateListCtrl Demo", size=(850,600))
#----------------------------------------------------------------------
if __name__ == "__main__":
app = wx.App(False)
frame = TestFrame()
col_headers = ['col0', 'col1', 'col2']
list_data = [
["Newsboys", "Go", "Rock"],
["Puffy", "Bring It!", "Pop"],
["Family Force 5", "III", "Pop"],
["Me2", "III", "Pop"],
["Duffy", "III", "Pop"],
["Fluffy", "III", "Pop"],
]
# sel_data passes in a list of which rows are already selected
sel_data = [
False,
False,
False,
False,
True,
False,
]
opt=ULC.ULC_MASK_CHECK # just reusing this to indicate I want a column of checkboxes.
dlg = FilterListDiag(frame, -1, "hi", headers=col_headers, data_table=list_data, options=opt, selected_list=sel_data)
(w, h) = dlg.myGetNeedWH()
print w,h
dlg.SetSizeWH(w, 300)
val = dlg.ShowModal()
selected = dlg.myGetSelectedState()
print "okay, can, val= ", wx.ID_OK, wx.ID_CANCEL, val
dlg.Destroy()
print 'selected=', selected
3
我觉得ObjectListView这个封装比直接使用wx.ListCtrl要好。它有一个很棒的功能，就是可以在控件中筛选项目。你可以在这里了解更多信息：http://objectlistview.sourceforge.net/python/features.html#filtering，这是这个控件的主页：http://objectlistview.sourceforge.net/python/
4
wxPython的演示程序里有一个相当不错的“自动补全”过滤器。查看一下Main.py的源代码，他们是用“手动”的方式来实现的，也就是通过循环来重新构建列表。他们使用的是树形视图，但这些思路都是很靠谱的：
def OnSearch(self, event=None):
value = self.filter.GetValue()
if not value:
self.RecreateTree()
return
wx.BeginBusyCursor()
for category, items in _treeList:
self.searchItems[category] = []
for childItem in items:
if SearchDemo(childItem, value):
self.searchItems[category].append(childItem)
wx.EndBusyCursor()
self.RecreateTree()