Utility object that helps with touchscreen scroll events.
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#include <AUI/Util/ATouchScroller.h>
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static float | deceleration () |
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static constexpr float | BASE_DECELERATION = 1600.f |
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static constexpr float | INITIAL_ACCELERATION_COEFFICIENT = 60.f |
| | Initial acceleration after pointer released is defined by direction of pointer moving and this coefficient.
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static constexpr AMetric | THRESHOLD = 8_dp |
| | Distance that pointer have to pass in order to treat pointer move events as scroll events.
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To use this class, you have to pass APointerPressedEvent APointerReleasedEvent to handlePointerPressed and handlePointerReleased methods accordingly. To receive scroll value, use handlePointerMove method.
◆ gatherKineticScrollValue()#
| AOptional< glm::ivec2 > ATouchScroller::gatherKineticScrollValue |
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nodiscard |
- Returns
- std::nullopt if ATouchScroller is not in kinetic scroll state; value for kinetic scroll otherwise.
This method should be called every render frame in order to make continuous kinetic scroll.
◆ handlePointerMove()#
| glm::ivec2 ATouchScroller::handlePointerMove |
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glm::vec2 | pos | ) |
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- Parameters
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| pos | position of the event in relation to view that used ATouchScroller. |
- Returns
- the amount of scroll in pixels.
