Empty borders can be placed around items by using one or more of the wxALL, wxLEFT, wxRIGHT, wxTOP, and wxBOTTOM flags of the Add method and giving the width in pixels in the border parameter.ġ wx. The "items" that can be Add'ed to a sizer are windows, sizers or empty space specified by using a width and height. In fact, it's been said that most common layouts can be acheived by nesting various vertical and horizontal box sizers. Sizers can be nested within each other to acheive more complex layouts. For example, if you have 3 items and you want the first to take 50% of the space and the remaining two to get 25% each then you would use proportions of 2, 1, 1 respectively. If 2 is used, then it will get two shares, etc. If the proportion is zero, then the item's minimum size will be used if it is one, then it will get one share of the available size (after fixed size items are calculated). (So, for example, for a vertical box sizer items with w圎XPAND will expand in the horizontal direction.) The "proportion" parameter for box sizers indicates if the item is stretchable in the main orientation of the sizer and how much of the available space is taken up by the item. When an item is Add'ed with the w圎XPAND flag, the item will be resized to fill its alloted area in the opposite orientation. When using box sizers you specify either wxHORIZONTAL or wxVERTICAL, which is the orientation with which items are laid out. Starting in wxPython 2.3.3 you can easily find the sizer that is managing a window with the GetContainingSizer method. You'll probably want to also call parentWindow.Layout() (or whomever owns the sizer) as well so the changes become visible. If a window managed by a sizer changes its content and you want to change the minimum size that the sizer uses for it, you can call. Simply calling self.Layout from the end of the frame's _init_ method will usually resolve this. SIZER PROGRAM NOT WORKING WINDOWS
For example, if a frame is given its size when it is created, and then you add child windows to it, and then a sizer, and finally Show it, then it may not receive another size event (depending on platform) in order to do the initial layout.
Since Layout doesn't happen until there is a size event, you will sometimes have to force the issue by calling Layout yourself. Notice that wxWindow is not on the list (for various reasons), but if needed you can still allow it (or your own class derived directly form wxWindow) to have sizers and do auto layout by hooking EVT_SIZE and doing something like this:ġ def OnSize( self, evt): 2 if self. wxSplitterWindow, and wxNotebook and some others do specialized layout of their children, but if the children have sizers of their own then it should work as expected. Off the top of my head, those that do have it are wxFrame (and other frame types), wxDialog, wxPanel and wxScrolledWindow. Not all windows have this default behaviour for the EVT_SIZE handler.Or layout constraints to layout sub-windows. In other words, when EVT_SIZE happens, if you haven't connected your own size handler, and if the window has had a sizer assigned, and if auto-layout has been turned on, then the window's Layout method is called where it uses the assigned sizer The actual layout of windows controlled by a sizer (or layout constraints for that matter) happens in the default EVT_SIZE handler for a window.
More often I've found that I would rather use the default size of a frame (or the user-set size that I've loaded from a config file) and allow the sizer to layout to that size instead. It will use the minimum size of all the contained windows and sub-sizers and resize the frame so it just barely fits those minimums. Often sizer.Fit(frame) is NOT what you want.If the sizer has no other reason to enlarge the window then you will see nothing of it.
Several window types default to (0,0) initial size so if you don't give them another size that is what the sizer will use for the minimum.
In normal use the sizers will treat a window's initial size when it is Add'ed to the sizer as its minimum size, and will use that size to calculate layout. Button( frame, - 1, " This is resized ") 5 frame. Frame( None, - 1, " Just one child ", size=( 250, 150)) 4 button = wx.
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