Canvas:onMouseUp()

Canvas:onMouseUp(x, y, buttons)event

This event is fired when the user releases a mouse button while beeing over the Canvas.

Parameters

The horizontal position of the mouse in the Canvas area.

The vertical position of the mouse in the Canvas area.

Notes

This function provides DIP (device independent pixels) coordinates.

buttons

A table which fields indicates if mouse buttons or special keys have been pressed during the mouse up event :

"left": true if left mouse button is pressed, false otherwise
"right": true if right mouse button is pressed, false otherwise
"middle": true if middle mouse button is pressed, false otherwise
"control": true if the CONTROL key is pressed, false otherwise
"shift": true if the SHIFT mouse button is pressed, false otherwise

Return value

The event returns no value.

Example


--! luart-extensions
import ui
require "canvas"

-- create a fixed Window
local win = ui.Window("Canvas:onMouseUp() event sample", "fixed", 320, 200)
win:status("")

-- create a Canvas
local canvas = ui.Canvas(win, 0, 0, 100, 100)
canvas.cursor = "cross"
canvas.bgcolor = 0xFFA0A0FF
canvas:center()

function canvas:onMouseUp(x, y, buttons)
  local btn = ""
  if buttons.left then btn = btn.." left" end
  if buttons.right then btn = btn.." right" end
  if buttons.middle then btn = btn.." middle" end
  if buttons.shift then btn = btn.." shift" end
  win:status("x : "..math.floor(x), "y : "..math.floor(y), "buttons : "..(btn == "" and "none" or btn))
end

await win:showasync()