更改网格数据时更改网格的大小 [英] Changing Size of Grid when grid data is changed

问题描述

在最初使用 Python 创建 wx 网格后，我无法更新它.我正在按照此处的步骤操作:http://wiki.wxpython.org/wxGrid但由于某种原因，网格未正确显示.无论数据增长还是缩小，行都会不断添加和添加.

I'm having trouble updating a wx grid after it's initially created in Python. I'm following the steps located here: http://wiki.wxpython.org/wxGrid but for some reason the grid is not being displayed correctly. The rows keep on being added and added, despite if the data grows or shrinks.

这是代码.单击刷新按钮重新初始化网格应该显示的数据.错误(我认为)在函数 refreshGrid 中，但我不知道是什么导致了它！

Here is the code. Clicking the refresh button re-initializes the data that the grid is supposed to display. The bug (I think) is in the function refreshGrid, but I can't figure out what is causing it!

import wx
from wxPython.wx import *
from wxPython.grid import *
import wx.grid
import wx.grid as gridlib
from wx.grid import Grid
import os
import sys

class MyForm(wx.Frame):

    def __init__(self):
        self.refreshMyData()

        #- Initialize the window:
        wx.Frame.__init__(self, None, wx.ID_ANY, "Grid with Popup Menu", size=(1100,300))

        # Add a panel so it looks correct on all platforms
        self.panel = wx.Panel(self, wx.ID_ANY)

        num_of_columns = 3
        self.grid = gridlib.Grid(self.panel)
        self.grid.CreateGrid(len(self.myDataList), num_of_columns)

        # change a couple column labels
        self.grid.SetColLabelValue(0, "Name")
        self.grid.SetColLabelValue(1, "Tag")
        self.grid.SetColLabelValue(2, "ID")

        self.refreshGrid()

        toolbar = self.CreateToolBar()

        qtool = toolbar.AddLabelTool(wx.ID_ANY, 'Refresh', wx.Bitmap(os.path.join(os.path.dirname(__file__), 'refresh.png')))
        toolbar.AddSeparator()
        self.Bind(wx.EVT_TOOL, self.refreshButton, qtool)

        toolbar.Realize()
        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.grid, 1, wx.EXPAND, num_of_columns)
        self.panel.SetSizer(sizer)

    def refreshMyData(self):
        print '------------refreshing my data'
        import random
        self.myDataList = []
        for i in range(random.randrange(10)):
            self.myDataList.append({'Name':str(i), 'Tag':str(i), 'ID':str(i)})

    def refreshButton(self, event):
        self.refreshMyData()
        self.refreshGrid()

    def refreshGrid(self):
        print '\n\n\n------------refresh grid'
        #- Clear the grid:
        self.grid.ClearGrid()
        print 'Number of current rows: ' + str(self.grid.GetNumberRows())
        print 'Size of myDataList: ', len(self.myDataList)
        self.grid.BeginBatch()
        current, new, delmsg, addmsg = (len(self.myDataList), self.grid.GetNumberRows(), wxGRIDTABLE_NOTIFY_ROWS_DELETED, wxGRIDTABLE_NOTIFY_ROWS_APPENDED)
        if new < current:
                print 'deleting rows:', current-new
                msg = wx.grid.GridTableMessage(
                        self.grid.GetTable(),
                        delmsg,
                        new,    # position
                        current-new,
                )
                self.grid.ProcessTableMessage(msg)
        elif new > current:
                print 'adding rows: ', new-current
                msg = wx.grid.GridTableMessage(
                        self.grid.GetTable(),
                        addmsg,
                        new-current
                )
                self.grid.ProcessTableMessage(msg)

        msg = wx.grid.GridTableMessage(self.grid.GetTable(), wxGRIDTABLE_REQUEST_VIEW_GET_VALUES)
        self.grid.ProcessTableMessage(msg)
        self.grid.EndBatch()

        print 'Number of current rows after data refresh and grid update: ' + str(self.grid.GetNumberRows())

        #- Populate the grid with new data:
        for i in range(len(self.myDataList)):
            self.grid.SetCellValue(i, 0, self.myDataList[i]['Name'])
            self.grid.SetCellValue(i, 1, self.myDataList[i]['Tag'])
            self.grid.SetCellValue(i, 2, self.myDataList[i]['ID'])

# Run the program
if __name__ == "__main__":
    app = wx.PySimpleApp()
    frame = MyForm().Show()
    app.MainLoop()

推荐答案

Dang.我想到了.解决办法如下:

Dang. I figured it out. Here is the solution:

def refreshGrid(self):
    print '\n\n\n------------refresh grid'
    #- Clear the grid:
    self.grid.ClearGrid()
    print 'Number of current rows: ' + str(self.grid.GetNumberRows())
    print 'Size of myDataList: ', len(self.myDataList)

    current, new = (self.grid.GetNumberRows(), len(self.myDataList))

    if new < current:
        #- Delete rows:
        self.grid.DeleteRows(0, current-new, True)

    if new > current:
        #- append rows:
        self.grid.AppendRows(new-current)


    #- Populate the grid with new data:
    print 'Num of rows has been modified to:', self.grid.GetSize()
    for i in range(len(self.myDataList)):
        self.grid.SetCellValue(i, 0, self.myDataList[i]['Name'])
        self.grid.SetCellValue(i, 1, self.myDataList[i]['Tag'])
        self.grid.SetCellValue(i, 2, self.myDataList[i]['ID'])

这篇关于更改网格数据时更改网格的大小的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！