wxpython flag = wx.EXPAND vs propotion = number

Question

我无法理解这一点:在sizer.Add中,设置比例以识别子窗口小部件的缩放比例,并且wx.EXPAND告诉孩子扩展以占用可用宽度.但是当没有将标志设置为wx.EXPAND并将比例设置为1时,子窗口小部件仍然会展开.

那么这两件事之间的关系/区别是什么？

谢谢

Answer 1

该比例特定于sizer类型(a wx.GridSizer将创建相同大小的X*Y单元格,因此不使用该比例).

使用a wx.BoxSizer,该比例指定沿着分级器轴的元素的比例.wx.BoxSizer(wx.HORIZONTAL)使用a proportion > 0将元素添加到a 将缩放水平轴上的项目.一个元素proportion=2将缩放为元素大小的两倍proportion=1.比例为0表示不应缩放元素.

wx.EXPAND指定元素应该增长以填充沿另一个轴可用的空间.将元素添加到wx.BoxSizer(wx.HORIZONTAL)with wx.EXPAND将展开垂直轴上的项目.

这个演示将演示效果:

import wx

class Frame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title='BoxSizer demo (resize the frame)')
        self.SetBackgroundColour(wx.WHITE)
        layout = wx.StaticBoxSizer(wx.StaticBox(self,label="wx.BoxSizer(wx.HORIZONTAL)"),wx.HORIZONTAL)
        # proportion=1
        layout.Add( wx.StaticText(self,label='proportion=1', style=wx.BORDER_DOUBLE ), 1, wx.ALL, 10 )
        # proportion=0, expand
        layout.Add( wx.StaticText(self,label='wx.EXPAND', style=wx.BORDER_DOUBLE ), 0, wx.EXPAND|wx.ALL, 10 )
        # proportion=0, align bottom
        layout.Add( wx.StaticText(self,label='wx.ALIGN_BOTTOM', style=wx.BORDER_DOUBLE ), 0, wx.ALIGN_BOTTOM|wx.ALL, 10 )
        # proportion=2, expand
        layout.Add( wx.StaticText(self,label='proportion=2 + wx.EXPAND', style=wx.BORDER_DOUBLE ), 2, wx.EXPAND|wx.ALL, 10 )
        self.SetSizerAndFit(layout)

app = wx.App(False)
Frame().Show()
app.MainLoop()

下一个演示演示了一个垂直框大小调整器中的水平框大小调整器:

import wx

class Frame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title='BoxSizer demo (resize the frame)')
        self.SetBackgroundColour(wx.WHITE)
        layout = wx.StaticBoxSizer(wx.StaticBox(self,label="wx.VERTICAL"),wx.VERTICAL)
        # row 1
        row = wx.wx.StaticBoxSizer(wx.StaticBox(self,label="wx.HORIZONTAL - proportion=0"),wx.HORIZONTAL)
        row.Add(wx.StaticText(self,label="proportion=0",style=wx.BORDER_DOUBLE),0, wx.ALL,10)
        row.Add(wx.StaticText(self,label="proportion=1",style=wx.BORDER_DOUBLE),1, wx.ALL,10)
        layout.Add(row) # add row 1 without arguments
        # row 2
        row = wx.StaticBoxSizer(wx.StaticBox(self,label="wx.HORIZONTAL - proportion=1"),wx.HORIZONTAL)
        row.Add(wx.StaticText(self,label="proportion=1",style=wx.BORDER_DOUBLE),1, wx.ALL,10)
        row.Add(wx.StaticText(self,label="proportion=2, wx.EXPAND",style=wx.BORDER_DOUBLE),2, wx.EXPAND|wx.ALL,10)
        layout.Add(row,1) # add row 2 with proportion = 1
        # row 3
        row = wx.StaticBoxSizer(wx.StaticBox(self,label="wx.HORIZONTAL - proportion=0, wx.EXPAND"),wx.HORIZONTAL)
        row.Add(wx.StaticText(self,label="proportion=0",style=wx.BORDER_DOUBLE),0, wx.ALL,10)
        row.Add(wx.StaticText(self,label="proportion=1",style=wx.BORDER_DOUBLE),1, wx.ALL,10)
        layout.Add(row,0,wx.EXPAND) # add row 3 with proportion = 0 and wx.EXPAND
        self.SetSizerAndFit(layout)

app = wx.App(False)
Frame().Show()
app.MainLoop()