Class: Wx::SF::Thumbnail

Inherits:
Panel
  • Object
show all
Defined in:
lib/wx/shapes/thumbnail.rb

Defined Under Namespace

Modules: ID Classes: THUMBSTYLE

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent) ⇒ Thumbnail

Returns a new instance of Thumbnail.



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# File 'lib/wx/shapes/thumbnail.rb', line 24

def initialize(parent)
  super(parent, Wx::ID_ANY, size: [200, 150], style: Wx::TAB_TRAVERSAL | Wx::FULL_REPAINT_ON_RESIZE)
  set_extra_style(Wx::WS_EX_BLOCK_EVENTS)
  set_size_hints([10, 10])

  @canvas = nil
  @scale = 1.0
  @thumb_style = THUMBSTYLE::SHOW_ELEMENTS | THUMBSTYLE::SHOW_CONNECTIONS
  @prev_mouse_pos = nil

  @update_timer = Wx::Timer.new(self, ID::UPDATETIMER)

  set_background_style(Wx::BG_STYLE_PAINT)

  evt_paint :_on_paint
  evt_erase_background :_on_erase_background
  evt_motion :_on_mouse_move
  evt_left_down :_on_left_down
  evt_right_down :_on_right_down
  evt_timer(ID::UPDATETIMER, :_on_timer)
  evt_update_ui(ID::M_SHOWELEMENTS, :_on_update_show_elements)
  evt_update_ui(ID::M_SHOWCONNECTIONS, :_on_update_show_connections)
  evt_menu(ID::M_SHOWELEMENTS, :_on_show_elements)
  evt_menu(ID::M_SHOWCONNECTIONS, :_on_show_connections)
end

Instance Attribute Details

#thumb_style ⇒ Object

Access (get/set) thumbnail style.



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# File 'lib/wx/shapes/thumbnail.rb', line 51

def thumb_style
  @thumb_style
end

Instance Method Details

#_on_paint(_event) ⇒ Object (protected)

Internally used event handler.

Parameters:

  • _event (Wx::PaintEvent) 


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# File 'lib/wx/shapes/thumbnail.rb', line 94

def _on_paint(_event)
  paint_buffered do |dc|
    # clear background
    dc.set_background(Wx::Brush.new(Wx::Colour.new(150, 150, 150)))
    dc.clear
    
    if @canvas
      sz_canvas = @canvas.get_client_size
      vsx, vsy = @canvas.get_virtual_size
      sz_canvas_offset = get_canvas_offset
      sz_thumb = get_client_size
      
      # scale and copy bitmap to DC
      cx = vsx.to_f
      cy = vsy.to_f
      tx = sz_thumb.x
      ty = sz_thumb.y
      
      if (tx/ty) > (cx/cy)
        @scale = ty/cy
      else
        @scale = tx/cx
      end
  
      # draw virtual canvas area
      dc.with_pen(Wx::WHITE_PEN) do
        dc.with_brush(Wx::Brush.new(Wx::Colour.new(240, 240, 240))) do
          dc.draw_rectangle(0, 0, (cx*@scale).to_i, (cy*@scale).to_i)

          # draw top level shapes
          Wx::ScaledDC.draw_on(dc, @scale * @canvas.get_scale)  do |sdc|
            draw_content(sdc)
          end

          # draw canvas client area
          dc.set_pen(Wx::RED_PEN)
          dc.set_brush(Wx::TRANSPARENT_BRUSH)
          dc.draw_rectangle((sz_canvas_offset.x.to_f*@scale).to_i, (sz_canvas_offset.y.to_f*@scale).to_i, (sz_canvas.x.to_f*@scale).to_i, (sz_canvas.y.to_f*@scale).to_i)
        end
      end
    end
    
    dc.set_background(Wx::NULL_BRUSH)
  end
end

#draw_content(dc) ⇒ Object

Parameters:

  • dc (Wx::DC) —

    Reference to output device context



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# File 'lib/wx/shapes/thumbnail.rb', line 69

def draw_content(dc)
  # HINT: overload it for custom actions...
  bmp_pen = nil
  @canvas.get_diagram.get_all_shapes.each do |shape|
    if (@thumb_style & THUMBSTYLE::SHOW_CONNECTIONS) != 0 && shape.is_a?(LineShape)
      shape.draw(dc, WITHOUTCHILDREN)
    elsif (@thumb_style & THUMBSTYLE::SHOW_ELEMENTS) != 0
      if shape.is_a?(BitmapShape)
        bmp_pen ||= Wx::Pen.new(Wx::BLACK, 1, Wx::PENSTYLE_DOT)
        dc.with_pen(bmp_pen) do
          dc.with_brush(Wx::WHITE_BRUSH) do
            dc.draw_rectangle(shape.get_bounding_box)
          end
        end
      elsif !shape.is_a?(LineShape)
        shape.draw(dc, WITHOUTCHILDREN)
      end
    end
  end
end

#get_canvas_offset ⇒ Wx::Size (protected)

Get offset (view start) of managed shape canvas defined in pixels.

Returns:

  • (Wx::Size) —

    Canvas offset in pixels



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# File 'lib/wx/shapes/thumbnail.rb', line 142

def get_canvas_offset
  if @canvas
    ux, uy = @canvas.get_scroll_pixels_per_unit
    offset_x, offset_y = @canvas.get_view_start

    return Wx::Size.new(offset_x*ux, offset_y*uy)
  end
  Wx::Size.new
end

#set_canvas(canvas) ⇒ Object

Set canvas managed by the thumbnail.

Parameters:



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# File 'lib/wx/shapes/thumbnail.rb', line 55

def set_canvas(canvas)
  @canvas = canvas

  if @canvas
    @update_timer.start(100)
  else
    @update_timer.stop
    refresh(false)
  end
end