wxPython网格中的自动换行和换行

问题描述

我想用具有以下行为的单元格实现一个网格:

I want to implement a grid with the cells that have the following behaviour:

1. 如果单元格文本不适合单元格，则应将其换行

1. cell text should be wrapped if it doesn't fit to the cell

单元格文本中的换行符 ( ) 也应该被处理

newlines ( ) in the cell text should be processed as well

即当您为单元格启用换行"选项时，其行为与 MS Excel、OO Calc 等表格编辑器中的行为相同.

i.e. the same behaviour as in table editors like MS Excel, OO Calc, etc. when you enable the 'wrap words' option for cells.

我正在尝试这样做:

import wx 
import wx.grid 

class MyGrid(wx.grid.Grid): 

    def __init__(self, parent = None, style = wx.WANTS_CHARS): 
        wx.grid.Grid.__init__(self, parent, -1, style = style)
        self.CreateGrid(10, 10)
        self.editor = wx.grid.GridCellAutoWrapStringEditor() 
        self.SetDefaultEditor(self.editor)
        self.SetDefaultRenderer(wx.grid.GridCellAutoWrapStringRenderer())
        self.SetCellValue(0, 0, "Line1
Line2
Line3") 
        self.SetRowSize(0, 100)

class MyFrame(wx.Frame): 

    def __init__(self, parent = None, title = "Multiline"): 
        wx.Frame.__init__(self, parent, -1, title)
        self.Bind(wx.EVT_CHAR_HOOK, self.on_frame_char_hook)
        panel = wx.Panel(self)
        vbox = wx.BoxSizer(wx.VERTICAL) 
        panel.SetSizer(vbox)
        grid = MyGrid(panel) 
        vbox.Add(grid, 1, wx.EXPAND | wx.ALL, 5) 
        self.grid = grid
        btn_exit = wx.Button(panel, -1, "Exit") 
        vbox.Add(btn_exit, 0, wx.ALIGN_CENTER_HORIZONTAL | wx.ALL, 10) 

    #Proceed CTRL+ENTER as newline in the cell editor
    def on_frame_char_hook(self, event):
        if event.CmdDown() and event.GetKeyCode() == wx.WXK_RETURN: 
            if self.grid.editor.IsCreated(): 
                self.grid.editor.StartingKey(event) 
            else: 
                event.Skip
        else: 
            event.Skip()

if __name__ == "__main__": 
    app = wx.PySimpleApp() 
    f = MyFrame() 
    f.Center() 
    f.Show() 
    app.MainLoop()

但此代码无法按预期工作 - 单元格编辑器中正确处理了换行符，但在单元格渲染器中被忽略了.如果我删除 self.SetDefaultRenderer(wx.grid.GridCellAutoWrapStringRenderer()) 则换行符在编辑器和渲染器中都正确处理，但显然在渲染器中自动换行不起作用.

But this code doesn't work as expected - newlines processed correctly in the cell editor, but ignored in the cell renderer. If I remove the self.SetDefaultRenderer(wx.grid.GridCellAutoWrapStringRenderer()) then newlines processed correctly both in the editor and renderer, but obviously auto wrapping in the renderer doesn't work.

有人知道怎么解决吗?

推荐答案

通过编写自定义渲染器解决了这个问题:

Solved this problem by writing a custom renderer:

from wx.lib import wordwrap
import wx.grid


class CutomGridCellAutoWrapStringRenderer(wx.grid.PyGridCellRenderer):   
    def __init__(self): 
        wx.grid.PyGridCellRenderer.__init__(self)

    def Draw(self, grid, attr, dc, rect, row, col, isSelected):
        text = grid.GetCellValue(row, col)
        dc.SetFont( attr.GetFont() ) 
        text = wordwrap.wordwrap(text, grid.GetColSize(col), dc, breakLongWords = False)
        hAlign, vAlign = attr.GetAlignment()       
        if isSelected: 
            bg = grid.GetSelectionBackground() 
            fg = grid.GetSelectionForeground() 
        else: 
            bg = attr.GetBackgroundColour()
            fg = attr.GetTextColour() 
        dc.SetTextBackground(bg) 
        dc.SetTextForeground(fg)
        dc.SetBrush(wx.Brush(bg, wx.SOLID))
        dc.SetPen(wx.TRANSPARENT_PEN)
        dc.DrawRectangleRect(rect)            
        grid.DrawTextRectangle(dc, text, rect, hAlign, vAlign)

    def GetBestSize(self, grid, attr, dc, row, col): 
        text = grid.GetCellValue(row, col)
        dc.SetFont(attr.GetFont())
        text = wordwrap.wordwrap(text, grid.GetColSize(col), dc, breakLongWords = False)
        w, h, lineHeight = dc.GetMultiLineTextExtent(text)                   
        return wx.Size(w, h)        

    def Clone(self): 
        return CutomGridCellAutoWrapStringRenderer()

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