# wx.lib.agw.foldpanelbar¶

FoldPanelBar is a control that contains multiple panels, which can be expanded or collapsed.

## Description¶

The FoldPanelBar is a control that contains multiple panels (of type FoldPanelItem) that can be expanded or collapsed. The captionbar of the FoldPanelBar can be customized by setting it to a horizontal gradient style, vertical gradient style, a single colour, a rectangle or filled rectangle. The FoldPanel items can be collapsed in place or to the bottom of the control. wx.Window derived controls can be added dynamically, and separated by separator lines.

### How does it work¶

The internals of the FoldPanelBar is a list of FoldPanelItem objects. Through the reference of FoldPanel these panels can be controlled by adding new controls to a FoldPanel or adding new FoldPanels to the FoldPanelBar.

The CaptionBar fires events to the parent (container of all panel items) when a sub-panel needs resizing (either folding or expanding). The fold or expand process is simply a resize of the panel so it looks like all controls on it are gone. All controls are still child of the FoldPanel they are located on. If they don’t handle the event (and they won’t) then the owner of the FoldPanelBar gets the events.

This is what you need to handle the controls. There isn’t much to it just a lot of calculations to see what panel belongs where. There are no sizers involved in the panels, everything is purely x-y positioning.

### What can it do and what not?¶

1. What it can do:

• Run-time addition of panels (no deletion just yet);

• Run time addition of controls to the panel (it will be resized accordingly);

• Creating panels in collapsed mode or expanded mode;

• Various modes of caption behaviour and filling to make it more appealing;

• Panels can be folded and collapsed (or all of them) to allow more space.

2. What it cannot do:

• Selection of a panel like in a listctrl;

• Dragging and dropping the panels;

• Re-ordering the panels (not yet).

## Usage¶

Usage example:

import wx
import wx.lib.agw.foldpanelbar as fpb

class MyFrame(wx.Frame):

def __init__(self, parent):

wx.Frame.__init__(self, parent, -1, "FoldPanelBar Demo")

text_ctrl = wx.TextCtrl(self, -1, size=(400, 100), style=wx.TE_MULTILINE)

panel_bar = fpb.FoldPanelBar(self, -1, agwStyle=fpb.FPB_VERTICAL)

thing = wx.TextCtrl(fold_panel, -1, size=(400, -1), style=wx.TE_MULTILINE)

main_sizer = wx.BoxSizer(wx.VERTICAL)
self.SetSizer(main_sizer)

# our normal wxApp-derived class, as usual

app = wx.App(0)

frame = MyFrame(None)
app.SetTopWindow(frame)
frame.Show()

app.MainLoop()


## Supported Platforms¶

FoldPanelBar is supported on the following platforms:
• Windows (Verified on Windows XP, 2000)

• Linux/Unix (GTK2) (Thanks to Toni Brkic and Robin Dunn)

• Mac OSX (Thanks to Robin Dunn for the CaptionBar size patch)

## Window Styles¶

This class supports the following window styles:

Window Styles

Hex Value

Description

FPB_SINGLE_FOLD

0x1

Single fold forces other panels to close when they are open, and only opens the current panel. This will allow the open panel to gain the full size left in the client area.

FPB_COLLAPSE_TO_BOTTOM

0x2

All panels are stacked to the bottom. When they are expanded again they show up at the top.

FPB_EXCLUSIVE_FOLD

0x4

FPB_SINGLE_FOLD style plus the panels will be stacked at the bottom.

FPB_HORIZONTAL

0x8

FoldPanelBar will be horizontal.

FPB_VERTICAL

0x10

FoldPanelBar will be vertical.

## Events Processing¶

This class processes the following events:

Event Name

Description

EVT_CAPTIONBAR

The user has pressed the caption bar: FoldPanelBar will either expand or collapse the underlying panel.

FoldPanelBar is distributed under the wxPython license.
 CaptionBar This class is a graphical caption component that consists of a CaptionBarEvent This event will be sent when a EVT_CAPTIONBAR is mapped in the parent. CaptionBarStyle This class encapsulates the styles you wish to set for the FoldPanelBar The FoldPanelBar is a class which can maintain a list of FoldPanelItem This class is a child sibling of the FoldPanelBar class. It will FoldWindowItem This class is a child sibling of the FoldPanelItem class. It