Initial commit.

vim/autoload/railmoon/widget/canvas.vim

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+" Author: Mykola Golubyev ( Nickolay Golubev )
+" Email: golubev.nikolay@gmail.com
+" Site: www.railmoon.com
+" Module: railmoon#widget#canvas
+" Purpose: widget for drawing inside it 
+
+" -
+" [ internal usage ]
+" Name: callback_object
+" Purpose: handler for base back calls
+" -
+let s:callback_object = {}
+
+" -
+" [ public library function ]
+" Name: railmoon#widget#canvas#create
+" Purpose: create "canvas" widget
+" [ parameters ]
+" name              name of new vim window that will represent widget
+" callback_object   call back object with following methods
+"                       on_draw()   draw what inside canvas
+" -
+function! railmoon#widget#canvas#create(name, callback_object)
+    let new_object = railmoon#widget#base#create(a:name, s:canvas, [a:callback_object, s:callback_object])
+    
+    call s:auto_command_setup()
+
+    return new_object
+endfunction
+
+" -
+" [ internal usage ]
+" Name: auto_command_setup
+" Purpose: setup handlers for window triggers
+" -
+function! s:auto_command_setup()
+"    autocmd CursorMoved <buffer> call s:on_cursor_moved()
+endfunction
+
+function! s:callback_object.on_setup()
+endfunction
+
+" -
+" [ internal usage ]
+" Name: canvas
+" Purpose: widget object "canvas"
+" -
+let s:canvas = {}
+
+" -
+" [ object method ]
+" Object: canvas
+" Name: draw
+" Purpose: prepare_canvas for drawing and call user defined on_draw method
+" -
+function! s:canvas.draw()
+    call railmoon#trace#push('canvas.draw')
+    try
+
+    let selected = railmoon#widget#window#save_selected()
+    let is_selected = railmoon#widget#window#select(self.id)
+
+    if ! is_selected
+        throw 'widget:selection_window:draw:window_not_found'
+    endif
+
+    setlocal modifiable
+
+    0,$delete _
+    call railmoon#draw#prepare_canvas(winwidth('%'), winheight('%'))
+    call railmoon#widget#base#call_back(self, 'on_draw()')
+
+    setlocal nomodifiable
+
+    call railmoon#widget#window#load_selected(selected)
+
+    finally
+        call railmoon#trace#debug('...')
+        call railmoon#trace#pop()
+    endtry
+endfunction
+