Add formspec toolkit and refactor mainmenu to use it

Fix crash on using cursor keys in client menu without selected server
Add support for non fixed size tabviews

1 files changed, 171 insertions, 0 deletions

diff --git a/doc/fst_api.txt b/doc/fst_api.txt
new file mode 100644
index 000000000..54f2d07a6
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+++ b/doc/fst_api.txt
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+Formspec toolkit api 0.0.3
+==========================
+
+Formspec toolkit is a set of functions to create basic ui elements.
+
+
+File: fst/ui.lua
+----------------
+
+ui.lua adds base ui interface to add additional components to.
+
+ui.add(component) -> returns name of added component
+^ add component to ui
+^ component: component to add
+
+ui.delete(component) -> true/false if a component was deleted or not
+^ remove a component from ui
+^ component: component to delete
+
+ui.set_default(name)
+^ set component to show if not a single component is set visible
+^ name: name of component to set as default
+
+ui.find_by_name(name) --> returns component or nil
+^ find a component within ui
+^ name: name of component to look for
+
+File: fst/tabview.lua
+---------------------
+
+tabview_create(name, size, tabheaderpos) --> returns tabview component
+^ create a new tabview component
+^ name: name of tabview (has to be unique per ui)
+^ size: size of tabview
+	{
+		x,
+		y
+	}
+^ tabheaderpos: upper left position of tabheader (relative to upper left fs corner)
+	{
+		x,
+		y
+	}
+
+Class reference tabview:
+
+methods:
+- add_tab(tab)
+  ^ add a tab to this tabview
+  ^ tab:
+  {
+	name               = "tabname",      -- name of tab to create
+	caption            = "tab caption",  -- text to show for tab header
+	cbf_button_handler = function(tabview, fields, tabname, tabdata), -- callback for button events
+	--TODO cbf_events         = function(tabview, event, tabname),           -- callback for events
+	cbf_formspec       = function(tabview, name, tabdata),            -- get formspec
+	tabsize            =
+		{
+			x, -- x width
+			y  -- y height
+		},                                                            -- special size for this tab (only relevant if no parent for tabview set)
+	on_change          = function(type,old_tab,new_tab)               -- called on tab chang, type is "ENTER" or "LEAVE"
+  }
+- set_autosave_tab(value)
+  ^ tell tabview to automaticaly save current tabname as "tabview_name"_LAST
+  ^ value: true/false
+- set_tab(name)
+  ^ set's tab to tab named "name", returns true/false on success
+  ^ name: name of tab to set
+- set_global_event_handler(handler)
+  ^ set a handler to be called prior calling tab specific event handler
+  ^ handler: function(tabview,event) --> returns true to finish event processing false to continue
+- set_global_button_handler(handler)
+  ^ set a handler to be called prior calling tab specific button handler
+  ^ handler: function(tabview,fields) --> returns true to finish button processing false to continue
+- set_parent(parent)
+  ^ set parent to attach tabview to. TV's with parent are hidden if their parent
+	is hidden and they don't set their specified size.
+  ^ parent: component to attach to
+- show()
+  ^ show tabview
+- hide()
+  ^ hide tabview
+- delete()
+  ^ delete tabview
+- set_fixed_size(state)
+  ^ true/false set to fixed size, variable size
+
+File: fst/dialog.lua
+---------------------
+Only one dialog can be shown at a time. If a dialog is closed it's parent is
+gonna be activated and shown again.
+
+dialog_create(name, cbf_formspec, cbf_button_handler, cbf_events)
+^ create a dialog component
+^ name: name of component (unique per ui)
+^ cbf_formspec: function to be called to get formspec
+	function(dialogdata)
+^ cbf_button_handler: function to handle buttons
+	function(dialog, fields)
+^ cbf_events: function to handle events
+	function(dialog, event)
+
+Class reference dialog:
+
+methods:
+- set_parent(parent)
+  ^ set parent to attach a dialog to
+  ^ parent: component to attach to
+- show()
+  ^ show dialog
+- hide()
+  ^ hide dialog
+- delete()
+  ^ delete dialog from ui
+  
+members:
+- data
+  ^ variable data attached to this dialog
+- parent
+  ^ parent component to return to on exit
+  
+File: fst/buttonbar.lua
+-----------------------
+
+buttonbar_create(name, cbf_buttonhandler, pos, orientation, size)
+^ create a buttonbar
+^ name: name of component (unique per ui)
+^ cbf_buttonhandler: function to be called on button pressed
+	function(buttonbar,buttonname,buttondata)
+^ pos: position relative to upper left of current shown formspec
+	{
+		x,
+		y
+	}
+^ orientation: "vertical" or "horizontal"
+^ size: size of bar
+	{
+		width,
+		height
+	}
+
+Class reference buttonbar:
+
+methods:
+- add_button(btn_id, caption, button_image)
+- set_parent(parent)
+  ^ set parent to attach a buttonbar to
+  ^ parent: component to attach to
+- show()
+  ^ show buttonbar
+- hide()
+  ^ hide buttonbar
+- delete()
+  ^ delete buttonbar from ui
+
+Developer doc:
+==============
+Skeleton for any component:
+{
+	name           = "some id",               -- unique id
+	type           = "toplevel",              -- type of component
+	                                          -- toplevel: componant can be show without additional components
+	                                          -- addon:    component is an addon to be shown along toplevel component
+	hide           = function(this) end,      -- called to hide the component
+	show           = function(this) end,      -- called to show the component
+	delete         = function(this) end,      -- called to delete component from ui
+	handle_buttons = function(this,fields)    -- called upon button press
+	handle_events  = function(this,event)     -- called upon event reception
+	get_formspec   = function(this)           -- has to return formspec to be displayed
+}