lib/constrained_text_item.rb

   1 class ConstrainedTextItem < Qt::GraphicsItem
   2   def initialize(text, parent, constraint, opts = {})
   3     super(parent)
   4     @text = text
   5     @parent = parent
   6     @constraint = constraint
   7
   8     @font = opts[:font] || Qt::Font.new
   9     @color = opts[:color] || Qt::Color.new(Qt::black)
  10
  11     @brect = Qt::FontMetrics.new(@font).bounding_rect(@text)
  12     @factor = [
  13       0.9 * @constraint.width / @brect.width,
  14       @constraint.height / @brect.height].min
  15   end
  16
  17   def paint(p, opts, widget)
  18     p.pen = @color
  19     p.font = @font
  20     p.draw_rect @constraint
  21     p.saving do
  22       p.translate(@constraint.center)
  23       p.scale(@factor, @factor)
  24       p.translate(-@brect.center)
  25       p.draw_text(0, 0, @text)
  26     end
  27   end
  28
  29   def boundingRect
  30     @constraint
  31   end
  32
  33   def name
  34     @text
  35   end
  36 end