Add touch input support #6695
Add touch input support #6695
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Thanks for pushing this forward! I've tested this patch and it works for me as expected. |
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There is one minor difference from the way this branch works vs. my branch (which is a rebased version of #4346): When zooming, then it's not possible to keep one finger on the touchscreen while sweeping with the other to zoom out or in. Instead, the zooming gesture has to be done without interruption. For me that's fine, but the previous behavior is more inline with other touch-enabled stuff. |
Yeah I've intentionally made this change to keep things simpler and at least personally I've never used pinch gestures any other way. I might just be speaking from my personal habit, but either way it should be fairly simple to extend the existing functionality to allow for one finger to be released if people do desire it. |
This patch builds upon the prior work by @4z3 and @bytbox to add touchscreen support to Alacritty. While some inspiration was taken from @4z3's patch, it was rewritten from scratch. This patch supports 4 basic touch interactions: - Tap - Scroll - Select - Zoom Tap allows emulating the mouse to enter a single LMB click. While it would be possible to add more complicated mouse emulation including support for RMB and others, it's likely more confusing than anything else and could conflict with other more useful touch actions. Scroll and Select are started by horizontal or vertical dragging. While selection isn't particularly accurate with a fat finger, it works reasonably well and the separation from selection through horizontal and vertical start feels pretty natural. Since horizontal drag is reserved for selection we do not support horizontal scrolling inside the terminal. While it would be possible to somewhat support it by starting a selection with vertical movement and then scrolling horizontally afterwards, it would likely just confuse people so it was left out. Zoom is pretty simple in just changing the font size when a two-finger pinch gesture is used. Performance of this is pretty terrible especially on low-end hardware since this obviously isn't a cheap operation, but it seems like a worthwhile addition since small touchscreen devices are most likely to need frequent font size adjustment to make output readable. Closes alacritty#3671.
Since the touch state is referenced everywhere as `touch_purpose` anyway, it should be named accordingly.
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Love it! |
This patch builds upon the prior work by @4z3 and @bytbox to add touchscreen support to Alacritty. While some inspiration was taken from @4z3's patch, it was rewritten from scratch.
This patch supports 4 basic touch interactions:
Tap allows emulating the mouse to enter a single LMB click. While it would be possible to add more complicated mouse emulation including support for RMB and others, it's likely more confusing than anything else and could conflict with other more useful touch actions.
Scroll and Select are started by horizontal or vertical dragging. While selection isn't particularly accurate with a fat finger, it works reasonably well and the separation from selection through horizontal and vertical start feels pretty natural.
Since horizontal drag is reserved for selection we do not support horizontal scrolling inside the terminal. While it would be possible to somewhat support it by starting a selection with vertical movement and then scrolling horizontally afterwards, it would likely just confuse people so it was left out.
Zoom is pretty simple in just changing the font size when a two-finger pinch gesture is used. Performance of this is pretty terrible especially on low-end hardware since this obviously isn't a cheap operation, but it seems like a worthwhile addition since small touchscreen devices are most likely to need frequent font size adjustment to make output readable.
Closes #3671.