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Basalt/docs/objects/Object/onDrag.md
Robert Jelic bb1b1beb79 Basalt 1.7 Update 
- New Objects (Flexbox, Graph, Treeview)
- Pluginsystem to add/remove functionality
- Reworked the entire Object system, instead of one big Object Class we have multiple classes: Object, VisualObject, ChangeableObject
- Instead of one big Frame Class we have multiple Frame Classes: BaseFrame, Frame, MovableFrame, ScrollableFrame, MonitorFrame, Flexbox
- Removed the Animation Object, and added a animation plugin instead
- Removed the Graphic Object and merged it's functionality with the image object
- Updated currently existing objects
2023-04-30 17:05:34 +02:00

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onDrag

Description

onDrag(self, event, button, x, y, xOffset, yOffset)

The onDrag event is triggered when an object is being dragged with the mouse.

Returns

  1. object The object in use

Usage

  • Add an onDrag event to an object:
local basalt = require("basalt")

local main = basalt.createFrame()
local button = main:addButton()
  :setPosition(3,3)
  :setSize(12,3)
  :setText("Drag")

function buttonOnDrag(event, button, x, y)
  basalt.debug("Button dragged at position: " .. x .. ", " .. y)
end
button:onDrag(buttonOnDrag)
  • You can also change the frame's offset, by dragging around:
local basalt = require("basalt")

local main = basalt.createFrame()
    :onDrag(function(self, button, x, y, xOffset, yOffset)
      self:setOffset(-xOffset, -yOffset, true)
    end)

local button = main:addButton()
  :setPosition(3,3)
  :setSize(12,3)
  :setText("Click")
local button2 = main:addButton()
  :setPosition(16,3)
  :setSize(12,3)
  :setText("Click")

basalt.autoUpdate()
  • Here is a example how to resize a frame by dragging a button around:
local basalt = require("basalt")

local main = basalt.createFrame()

local sub = main:addFrame():setSize(30,12):setMovable()
sub:addLabel():setText("Example Frame"):setSize("parent.w", 1):setBackground(colors.black):setForeground(colors.lightGray)

local dragButton = sub:addButton()
  :setAnchor("bottomRight")
  :setPosition(1,1)
  :setSize(1,1)
  :setText("/")
  :onDrag(function(self, button, x, y, xOffset, yOffset)
    sub:setSize(-xOffset, -yOffset, true)
  end)

basalt.autoUpdate()