Why is wx.NO_BORDER changing panels within a frame

Why is wx.NO_BORDER changing panels within a frame - Printable Version

+- Python Forum (https://python-forum.io)
+-- Forum: Python Coding (https://python-forum.io/forum-7.html)
+--- Forum: GUI (https://python-forum.io/forum-10.html)
+--- Thread: Why is wx.NO_BORDER changing panels within a frame (/thread-28271.html)

Why is wx.NO_BORDER changing panels within a frame - MeghansUncle2 - Jul-12-2020

In the code below (within wx.Frame.__init__) when I add "style=wx.NO_BORDER" the panels shrink to almost nothing.
Please run with and without this style to see the difference. Can anyone explain this behavior? I am learning Python and this behavior seems to me to be in error. I would like to understand why this is happening so that I can prevent it.

import wx

########################################################################
class RandomPanel(wx.Panel):
    """"""

    #----------------------------------------------------------------------
    def __init__(self, parent, color):
        """Constructor"""
        wx.Panel.__init__(self, parent)
        self.SetBackgroundColour(color)



########################################################################
class MainPanel(wx.Panel):
    """"""

    #----------------------------------------------------------------------
    def __init__(self, parent):
        """Constructor"""
        wx.Panel.__init__(self, parent)

        topSplitter = wx.SplitterWindow(self)
        hSplitter = wx.SplitterWindow(topSplitter)

        panelOne = RandomPanel(hSplitter, "blue")
        panelTwo = RandomPanel(hSplitter, "red")
        hSplitter.SplitVertically(panelOne, panelTwo)
        hSplitter.SetSashGravity(0.7)

        panelThree = RandomPanel(topSplitter, "green")
        topSplitter.SplitHorizontally(hSplitter, panelThree)
        topSplitter.SetSashGravity(0.5)

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(topSplitter, 1, wx.EXPAND)
        self.SetSizer(sizer)

########################################################################
class MainFrame(wx.Frame):
    """"""

    #----------------------------------------------------------------------
    def __init__(self):
        """Constructor"""
        wx.Frame.__init__(self, None, title="",
                  size=(800,600), style=wx.NO_BORDER)
        panel = MainPanel(self)
        self.Show()

#----------------------------------------------------------------------
if __name__ == "__main__":
    app = wx.App(False)
    frame = MainFrame()
    app.MainLoop()

RE: Why is wx.NO_BORDER changing panels within a frame - Larz60+ - Jul-12-2020

Works fine when I try it.

RE: Why is wx.NO_BORDER changing panels within a frame - Yoriz - Jul-12-2020

Calling layout fixes it

import wx
 
########################################################################
class RandomPanel(wx.Panel):
    """"""
 
    #----------------------------------------------------------------------
    def __init__(self, parent, color):
        """Constructor"""
        wx.Panel.__init__(self, parent)
        self.SetBackgroundColour(color)
 
 
 
########################################################################
class MainPanel(wx.Panel):
    """"""
 
    #----------------------------------------------------------------------
    def __init__(self, parent):
        """Constructor"""
        wx.Panel.__init__(self, parent)
 
        topSplitter = wx.SplitterWindow(self)
        hSplitter = wx.SplitterWindow(topSplitter)
 
        panelOne = RandomPanel(hSplitter, "blue")
        panelTwo = RandomPanel(hSplitter, "red")
        hSplitter.SplitVertically(panelOne, panelTwo)
        hSplitter.SetSashGravity(0.7)
 
        panelThree = RandomPanel(topSplitter, "green")
        topSplitter.SplitHorizontally(hSplitter, panelThree)
        topSplitter.SetSashGravity(0.5)
 
        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(topSplitter, 1, wx.EXPAND)
        self.SetSizer(sizer)
 
########################################################################
class MainFrame(wx.Frame):
    """"""
 
    #----------------------------------------------------------------------
    def __init__(self):
        """Constructor"""
        wx.Frame.__init__(self, None, title="",
                  size=(800,600), style=wx.BORDER_NONE)
        panel = MainPanel(self)
        self.Layout()
        self.Show()
 
#----------------------------------------------------------------------
if __name__ == "__main__":
    app = wx.App(False)
    frame = MainFrame()
    app.MainLoop()

Note:

https://wxpython.org/Phoenix/docs/html/wx.Window.html#styles-window-styles Wrote:Window Styles
wx.BORDER_NONE: Displays no border, overriding the default border style for the window. wx.NO_BORDER is the old name for this style.

RE: Why is wx.NO_BORDER changing panels within a frame - MeghansUncle2 - Jul-12-2020

THANK YOU Yoriz!!!

Can you briefly explain WHY this works?

RE: Why is wx.NO_BORDER changing panels within a frame - Yoriz - Jul-12-2020

https://docs.wxpython.org/wx.Window.html#wx.Window.Layout Wrote:Layout(self)
Lays out the children of this window using the associated sizer.

If a sizer hadn’t been associated with this window (see SetSizer ), this function doesn’t do anything, unless this is a top level window (see wx.TopLevelWindow.Layout ).

Note that this method is called automatically when the window size changes if it has the associated sizer (or if SetAutoLayout with True argument had been explicitly called), ensuring that it is always laid out correctly.

Return type
bool

Returns
Always returns True, the return value is not useful.

See also Window Sizing Overview