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#142 Add WHEEL_SCROLL_BY_INERTION Scroll style param

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Insality 2021-10-23 17:10:15 +03:00
parent d24301cd13
commit 009c3999c4
3 changed files with 25 additions and 7 deletions
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4
docs_md/changelog.md
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@ -248,4 +248,6 @@ Have a good day.
- The `failure_callback`will be called if `check_function` will return false. It's callback for you if button is not available
- Example with `set_check_function` exists in general:buttons example collection
- **#107** Better scale text adjust by height for multiline text nodes (but still not perfect)
- **#144** Fix some glitches with scroll Points of Interest. Remove false detection of scroll stopped.
- **#144** Fix some glitches with scroll Points of Interest. Remove false detection of scroll stopped.
- **#142** Add Scroll style param `WHEEL_SCROLL_BY_INERTION` (default - false). If true - mouse wheel will add inertion to scroll, if false - set position directly per mouse wheel event.
- This fix caused, what Mac trackpad seems have additional mouse wheel events for simulate inertion. If you uncomfortable with this, you can disable `WHEEL_SCROLL_BY_INERTION` for more controllable scroll by mouse wheel.

23
druid/base/scroll.lua
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@ -113,6 +113,7 @@ end
-- @tfield[opt=false] bool SMALL_CONTENT_SCROLL If true, content node with size less than view node size can be scrolled
-- @tfield[opt=0] bool WHEEL_SCROLL_SPEED The scroll speed via mouse wheel scroll or touchpad. Set to 0 to disable wheel scrolling
-- @tfield[opt=false] bool WHEEL_SCROLL_INVERTED If true, invert direction for touchpad and mouse wheel scroll
-- @tfield[opt=false] bool WHEEL_SCROLL_BY_INERTION If true, wheel will add inertion to scroll. Direct set position otherwise.
function Scroll.on_style_change(self, style)
self.style = {}
self.style.EXTRA_STRETCH_SIZE = style.EXTRA_STRETCH_SIZE or 0
@ -128,6 +129,7 @@ function Scroll.on_style_change(self, style)
self.style.SMALL_CONTENT_SCROLL = style.SMALL_CONTENT_SCROLL or false
self.style.WHEEL_SCROLL_SPEED = style.WHEEL_SCROLL_SPEED or 0
self.style.WHEEL_SCROLL_INVERTED = style.WHEEL_SCROLL_INVERTED or false
self.style.WHEEL_SCROLL_BY_INERTION = style.WHEEL_SCROLL_BY_INERTION or false
self._is_inert = not (self.style.FRICT == 0 or
self.style.FRICT_HOLD == 0 or
@ -753,15 +755,28 @@ function Scroll._process_scroll_wheel(self, action_id, action)
return false
end
local koef = (action_id == const.ACTION_SCROLL_UP) and 1 or -1
if self.style.WHEEL_SCROLL_INVERTED then
koef = -koef
end
if self.drag.can_y then
self.inertion.y = (self.inertion.y + self.style.WHEEL_SCROLL_SPEED * koef) * self.style.FRICT_HOLD
elseif self.drag.can_x then
self.inertion.x = (self.inertion.x + self.style.WHEEL_SCROLL_SPEED * koef) * self.style.FRICT_HOLD
if self.style.WHEEL_SCROLL_BY_INERTION then
if self.drag.can_y then
self.inertion.y = (self.inertion.y + self.style.WHEEL_SCROLL_SPEED * koef) * self.style.FRICT_HOLD
elseif self.drag.can_x then
self.inertion.x = (self.inertion.x + self.style.WHEEL_SCROLL_SPEED * koef) * self.style.FRICT_HOLD
end
else
if self.drag.can_y then
self.target_position.y = self.target_position.y + self.style.WHEEL_SCROLL_SPEED * koef
self.inertion.y = 0
elseif self.drag.can_x then
self.target_position.x = self.target_position.x + self.style.WHEEL_SCROLL_SPEED * koef
self.inertion.x = 0
end
self:_set_scroll_position(self.target_position)
end
return true

5
druid/styles/default/style.lua
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@ -73,8 +73,9 @@ M["scroll"] = {
INERT_SPEED = 30, -- koef. of inert speed
EXTRA_STRETCH_SIZE = 100, -- extra size in pixels outside of scroll (stretch effect)
POINTS_DEADZONE = 20, -- Speed to check points of interests in no_inertion mode
WHEEL_SCROLL_SPEED = 0,
WHEEL_SCROLL_INVERTED = false,
WHEEL_SCROLL_SPEED = 0, -- Amount of pixels to scroll by one wheel event (0 to disable)
WHEEL_SCROLL_INVERTED = false, -- Boolean to invert wheel scroll side
WHEEL_SCROLL_BY_INERTION = false, -- If true, wheel will add inertion to scroll. Direct set position otherwise.
SMALL_CONTENT_SCROLL = true, -- If true, content node with size less than view node size can be scrolled
}