gistfile1.swift

  func updateKeys()
  {
    CATransaction.begin()
    CATransaction.setDisableActions(true);
    
    var x: CGFloat = 0
    var y: CGFloat = 0
    var rowHeight = ceil(self.inputView.frame.size.height / 5)
    var colWidth = ceil(self.inputView.frame.size.width / 10)
    
    var rowIndex = 0
    var colIndex = 0
    
    for row in self.keyLayers {
      for keyLayer in row {
        var cellWidth = colWidth
        
        
        let title = self.activeKeyTitles[rowIndex][colIndex]
        switch title {
        case "←", "↵", "⌥", "⚙", "⊙":
          cellWidth *= 1.5
          cellWidth = ceil(cellWidth)
        case " ":
          cellWidth *= 4
        default:
          break
        }
        
        var active = false
        if title == "↑" && self.shiftStateActive {
          active = true
        } else if title == "⌥" && self.altStateActive {
          active = true
        } else {
          for highlightedKey in self.highlightedKeys {
            if highlightedKey.key == title {
              active = true
              break
            }
          }
        }

        if ((fabs(keyLayer.frame.size.width - cellWidth) > 0.1) || keyLayer.active != active || keyLayer.key != title) {
          var h = rowHeight
          if (y + h > self.inputView.frame.size.height) {
            h = self.inputView.frame.size.height - y
          }
          
          var w = cellWidth
          if (x + w > self.inputView.frame.size.width) {
            w = self.inputView.frame.size.width - x
          }
          
          keyLayer.frame = CGRect(x: x, y: y, width: w, height: h)
          keyLayer.key = title
          keyLayer.active = active
          keyLayer.setNeedsDisplay()
        }
        
        x += cellWidth
        colIndex++
      }
      y += rowHeight
      x = 0
      colIndex = 0
      rowIndex++
    }
    
    CATransaction.commit()
  }