Lua: work-in-progress library (made in Lua) for object-oriented GUI. Already implements windows, buttons, and dynamic labels.

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@2055 416bcca6-2ee7-4201-b75f-2eb2f807beb1

share/grafx2/scripts/_tst_dialog2.lua

@@ -0,0 +1,33 @@
+--
+-- test of GUI library
+--
+run("libs/gui.lua")
+
+local counter = gui.label{x=10, y=54, value=0, format="% .3d"}
+local form = gui.dialog{
+    title="Dialogtest",
+    w=100,
+    h=150,
+    counter,
+    gui.button{ label="+",
+      x=6, y=38, w=14, h=14, repeatable=true, click=function() 
+      counter.value=counter.value+1;
+      counter:render();
+    end},
+    gui.button{ label="-",
+      x=26, y=38, w=14, h=14, repeatable=true, click=function()
+      counter.value=counter.value-1;
+      counter:render();
+    end},
+    gui.button{ label="Help",
+      x=6, y=70, w=54, h=14, click=function()
+      messagebox("Help screen");
+    end},
+    gui.button{ label="Close",
+      x=6, y=18, w=54, h=14, key=27, click=function()
+      return true; -- causes closing
+    end},
+}
+
+form:run()
+

share/grafx2/scripts/libs/gui.lua

@@ -0,0 +1,111 @@
+--
+-- Event-driven GUI library
+--
+--
+
+gui = {
+
+--
+-- dialog() --
+--
+dialog = function(args)
+  local dia = {
+    title = args.title,
+    w = args.w,
+    h = args.h,
+    -- 
+    widgets = {},
+    -- an indexed array, starting at 1. Used for calling the relevant
+    -- callback when a numbered control is clicked.  
+    callbacks = {},
+    
+    --
+    -- dialog.run() --
+    --
+    run = function(this)
+      windowopen(this.w,this.h, this.title or "");
+      -- examine all elements
+      for _,widget in ipairs(this.widgets) do
+        widget:render()
+      end
+      
+      repeat
+       local button, button2, key = windowdodialog();
+      
+        if button > 0 then
+          local c = this.callbacks[button]
+          -- run the callback and stop the form if it returns true
+          if c ~= nil and c(this) then
+              break;
+          end
+        end
+      until key == 27;
+      windowclose();
+    end
+  }
+  local id = 1;
+  -- examine all elements
+  for _,value in ipairs(args) do
+    -- all arguments that are tables are assumed to be widgets
+    if type(value)=="table" then
+      table.insert(dia.widgets, value)
+      -- clickable widgets take up an auto-numbered id
+      if (value.click) then
+        dia.callbacks[id] = value.click
+        id=id+1
+      end
+    end
+  end
+  return dia;
+end,
+
+--
+-- button() --
+--
+button = function(args)
+  local but = {
+    x = args.x,
+    y = args.y,
+    w = args.w,
+    h = args.h,
+    key = args.key,
+    label = args.label,
+    click = args.click or donothing,
+    render = args.repeatable and function(this)
+      windowrepeatbutton(this.x, this.y, this.w, this.h, this.label, this.key or -1);
+    end
+    or function(this)
+      windowbutton(this.x, this.y, this.w, this.h, this.label, this.key or -1);
+    end
+  }
+  return but;
+end,
+
+--
+-- label() --
+--
+label = function(args)
+  local fld = {
+    x = args.x,
+    y = args.y,
+    value = args.value,
+    format = args.format,
+    fg = args.fg or 0,
+    bg = args.bg or 2,
+    render = function(this)
+      if type(this.format) then
+        windowprint(this.x, this.y, string.format(this.format, this.value), this.fg, this.bg);
+      else
+        windowprint(this.x, this.y, this.value, this.fg, this.bg);
+      end
+    end
+  }
+  return fld;
+end,
+
+
+-- "do nothing" function. Used as default callback
+donothing = function(this)
+end
+
+}