Difference between revisions of "Mouse scroll (event)"
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{{Event | {{Event | ||
|name=mouse_scroll | |name=mouse_scroll | ||
| Line 7: | Line 5: | ||
|return2=The X-coordinate of the scroll (in screen-characters). | |return2=The X-coordinate of the scroll (in screen-characters). | ||
|return3=The Y-coordinate of the scroll (in screen-characters). | |return3=The Y-coordinate of the scroll (in screen-characters). | ||
| + | |examples= | ||
| + | {{Example | ||
| + | |desc=Prints the direction and the co-ordinates of every mouse scroll we receive a ''mouse_scroll'' event for. | ||
| + | |code= | ||
| + | while true do | ||
| + | local event, scrollDirection, x, y = '''[[os.pullEvent]]("mouse_scroll")''' | ||
| + | [[print]]("mouse_scroll: " .. [[tostring]](scrollDirection) .. ", " .. | ||
| + | "X: " .. [[tostring]](x) .. ", " .. | ||
| + | "Y: " .. [[tostring]](y)) | ||
| + | end | ||
| + | |output=The direction the mouse-wheel was scrolled in, followed by the X and Y position of the event. | ||
| + | }} | ||
| + | {{Example | ||
| + | |desc=A variable <var>i</var> keeps track of the relative value of the scroll: every time a mouse-scroll occurs, the code checks the direction, incrementing the variable by one for every scroll up and decrementing the variable by one for every scroll down. | ||
| + | |code= local i = 0 | ||
| + | |||
| + | while true do | ||
| + | [[term.clear]]() | ||
| + | |||
| + | local _, srollDirection, x, y = '''[[os.pullEvent]]("mouse_scroll")''' | ||
| + | |||
| + | if scrollDirection == -1 then | ||
| + | i = i + 1 | ||
| + | elseif scrollDirection == 1 then | ||
| + | i = i - 1 | ||
| + | end | ||
| + | |||
| + | [[term.setCursorPos]](x, y) | ||
| + | [[term.write]](i) | ||
| + | end | ||
| + | |output=At the coordinates of the scroll, the counter value <var>i</var> is printed. | ||
| + | }} | ||
}} | }} | ||
Latest revision as of 17:45, 10 April 2014
 Event mouse_scroll | |
| Fired when a mousewheel is scrolled in the terminal | |
| Returned Object 1 | The direction of the mouse-scroll (-1 = up, 1 = down). |
| Returned Object 2 | The X-coordinate of the scroll (in screen-characters). |
| Returned Object 3 | The Y-coordinate of the scroll (in screen-characters). |
Examples
 Example | |
| Prints the direction and the co-ordinates of every mouse scroll we receive a mouse_scroll event for. | |
| Code |
while true do local event, scrollDirection, x, y = os.pullEvent("mouse_scroll") print("mouse_scroll: " .. tostring(scrollDirection) .. ", " .. "X: " .. tostring(x) .. ", " .. "Y: " .. tostring(y)) end |
| Output | The direction the mouse-wheel was scrolled in, followed by the X and Y position of the event. |
| Example | |
| A variable i keeps track of the relative value of the scroll: every time a mouse-scroll occurs, the code checks the direction, incrementing the variable by one for every scroll up and decrementing the variable by one for every scroll down. | |
| Code |
local i = 0 while true do term.clear() local _, srollDirection, x, y = os.pullEvent("mouse_scroll") if scrollDirection == -1 then i = i + 1 elseif scrollDirection == 1 then i = i - 1 end term.setCursorPos(x, y) term.write(i) end |
| Output | At the coordinates of the scroll, the counter value i is printed. |
