Noah Petherbridge
b8665c8b8d
Made some fixes to touchscreen control detection: * TouchScreenMode is activated on the first SDL2 FingerDown * TouchScreenMode deactivates after the last finger is removed, and a mouse event happens at least 5 ticks later.
61 lines
1.9 KiB
Go
61 lines
1.9 KiB
Go
package native
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import (
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"git.kirsle.net/SketchyMaze/doodle/pkg/log"
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"git.kirsle.net/SketchyMaze/doodle/pkg/shmem"
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"git.kirsle.net/go/render/event"
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)
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// Common code to handle basic touch screen detection.
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var (
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isTouchScreenMode bool
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lastFingerDownTick uint64
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)
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// IsTouchScreenMode is activated when the user has touched the screen, and false when the mouse is moved.
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func IsTouchScreenMode() bool {
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return isTouchScreenMode
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}
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/*
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UpdateTouchScreenMode evaluates whether the primary game input is a touch screen rather than a mouse cursor.
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The game always hides the OS cursor (if it exists) and may draw its own custom mouse cursor.
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On a touch screen device (such as a mobile), the custom mouse cursor should not be drawn, either, as
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it would jump around to wherever the user last touched and be distracting.
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TouchScreenMode is activated when a touch event has been triggered (at least one finger was down).
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TouchScreenMode deactivates and shows the mouse cursor when no finger is held down, and then a mouse
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event has occurred. So if the user has a touch screen laptop, wiggling the actual mouse input will
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bring the cursor back.
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*/
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func UpdateTouchScreenMode(ev *event.State) {
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// If a finger is presently down, record the current tick.
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if ev.IsFingerDown {
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lastFingerDownTick = shmem.Tick
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}
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if !isTouchScreenMode {
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// We are NOT in touch screen mode. Touching the screen will change this.
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if ev.IsFingerDown {
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log.Info("TouchScreenMode ON")
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isTouchScreenMode = true
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}
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} else {
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// We ARE in touch screen mode. Wait for all fingers to be lifted.
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if !ev.IsFingerDown {
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// If we have registered a mouse event a few ticks after the finger was
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// removed, it is a real mouse cursor and we exit touch screen mode.
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if ev.IsMouseEvent && shmem.Tick-lastFingerDownTick > 5 {
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log.Info("TouchScreenMode OFF")
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isTouchScreenMode = false
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}
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}
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}
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}
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