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+---
+title: Container
+type: panel
+weight: 600
+description: |
+  It contains a miniature button box, equivalent to swallowing
+  another FvwmButtons module.
+---
+# Container
+
+* TOC
+{:toc}
+
+This example, I call "Key Panel" because the `Container's` unique options can
+be formed into any pattern, size and number of buttons. `FvwmButtons` to control
+many of my functions and application selection in one place.
+
+## Actions
+
+`Containers` are defined spaces that span multiple `rows` and `columns` or
+subdivide a row or column into more rows or columns. This can be useful for
+instance if one wants to allocate a certain space to elements. Say one wants
+to `swallow` an Xclock and Xosview. This can be defined as such:
+
+{% fvwm2rc %}
+*FvwmButtons: (Container(Rows 2, Columns 1)
+*FvwmButtons: (1x1, Swallow "xclock" 'Exec exec xclock')
+*FvwmButtons: (1x1, Swallow "xosview" 'Exec exec xosview')
+*FvwmButtons: (End)
+{% endfvwm2rc %}
+
+Note that a `container` is created by defining a certain number of `columns` and
+`rows` and then using the keyword `container`. Elements inside the container are
+defined underneath this line and the `container` is then closed with the `End` command.
+
+## Container Configuration
+
+The options are the same as can be given for a single button, but they affect all
+the contained buttons.
+
+**Getting the size right:**
+
+First, it calculates the number of button unit areas it will need, by adding the
+width times the height in buttons of each button. `Containers` are for the moment
+considered a normal button. Then it considers the given `rows` and `columns` arguments.
+If the number of `rows` is given, it will calculate how many `columns` are needed, and
+stick to that, unless `columns` is larger, in which case you will get some empty
+space at the bottom of the buttonbox. If the number of `columns` is given, it
+calculates how many `rows` it needs to fit all the buttons. If neither is given, it
+assumes you want two `rows`, and finds the number of `columns` from that.
+
+Suppose you have 6 buttons, all unit sized except number two, which is `2x2` (width x height).
+This makes for 5 times 1 plus 1 times 4 equals 9 unit buttons in total area. Assume you have
+requested 3 `rows`.
+
+![image](6-buttons.png)
+
+{% fvwm2rc %}
+*Expl-1: (Container(Rows 3))
+*Expl-1: (1x1, Title "1")
+*Expl-1: (2x2, Title "2")
+*Expl-1: (1x1, Title "3")
+*Expl-1: (1x1, Title "4")
+*Expl-1: (1x1, Title "5")
+*Expl-1: (1x1, Title "6")
+*Expl-1: (End)
+{% endfvwm2rc %}
+
+6 buttons of different sizes (width x height): `1x1`, `1x2`, `2x2`, `1x3`, `2x1` and `4x1`.
+
+![image](6-size-buttons.png)
+ 
+{% fvwm2rc %}
+*Expl-2: (Container(Rows 4, Columns 4))
+*Expl-2: (1x2, Title "1")
+*Expl-2: (2x2, Title "2")
+*Expl-2: (1x3, Title "3")
+*Expl-2: (2x1, Title "4")
+*Expl-2: (1x1, Title "5")
+*Expl-2: (4x1, Title "6")
+*Expl-2: (End)
+{% endfvwm2rc %}
+
+## Example
+
+This screenshot shows a complex set of elements forming a `Container` configuration.
+Different command buttons, `Panel` that opens and closes a row of icons or apps, and
+`Swallow` a `FvwmPager` or other modules.
+
+![Screenshot of FvwmButtons showing Container, Panel, and Swallow commands.](
+container.png){:.d-block .mx-auto .img-fluid}
+
+{% fvwm2rc %}
+DestroyModuleConfig Expl-3: *
+*Expl-3: Geometry 160x240-0+0
+
+*Expl-3: (Container(Columns 4, Frame 1))
+*Expl-3: (2x2, Panel(left, steps 6, indicator 48) \
+         "IconButtons" 'Module FvwmButtons IconButtons')
+*Expl-3: (1x1, Icon /move.png, Action Move)
+*Expl-3: (1x1, Icon /quit.png, Action Quit)
+*Expl-3: (1x1, Icon /resize.png, Action Resize)
+*Expl-3: (1x1, Icon /close.png, Action Close)
+
+*Expl-3: (2x2, Title "calendar", Icon /cal.png, \
+         Action(Mouse 1) 'Exec exec Calendar.sh')
+*Expl-3: (2x2, Title "xclock", Swallow "xclock" 'Exec exec xclock')
+
+*Expl-3: (4x2, Swallow "PagerBar" 'FvwmPager PagerBar * *')
+*Expl-3: (End)
+
+AddToFunc StartFunction I Module FvwmButtons Expl-3
+{% endfvwm2rc %}