165 lines
3.9 KiB
Go
165 lines
3.9 KiB
Go
package mappingrules
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import (
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"slices"
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"time"
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"github.com/holoplot/go-evdev"
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)
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type MappingRuleBase struct {
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Name string
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Output RuleTarget
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Modes []string
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}
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// A Simple Mapping Rule can map a button to a button or an axis to an axis.
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type MappingRuleSimple struct {
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MappingRuleBase
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Input RuleTarget
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}
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// A Combo Mapping Rule can require multiple physical button presses for a single output button
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type MappingRuleCombo struct {
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MappingRuleBase
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Inputs []RuleTarget
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State int
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}
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type MappingRuleLatched struct {
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MappingRuleBase
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Input RuleTarget
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State bool
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}
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// TODO: How are we going to implement this? It needs to operate on a timer...
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type MappingRuleProportionalAxis struct {
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MappingRuleBase
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Input *RuleTargetAxis
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Output *RuleTargetButton
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Sensitivity int32
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LastValue int32
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LastEvent time.Time
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}
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func (rule *MappingRuleBase) OutputName() string {
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return rule.Output.GetDeviceName()
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}
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func (rule *MappingRuleBase) modeCheck(mode *string) bool {
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if rule.Modes[0] == "*" {
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return true
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}
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return slices.Contains(rule.Modes, *mode)
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}
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func (rule *MappingRuleSimple) MatchEvent(device *evdev.InputDevice, event *evdev.InputEvent, mode *string) *evdev.InputEvent {
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if !rule.MappingRuleBase.modeCheck(mode) {
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return nil
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}
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if device != rule.Input.GetDevice() ||
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event.Code != rule.Input.GetCode() {
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return nil
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}
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return rule.Output.CreateEvent(rule.Input.NormalizeValue(event.Value), mode)
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}
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func (rule *MappingRuleCombo) MatchEvent(device *evdev.InputDevice, event *evdev.InputEvent, mode *string) *evdev.InputEvent {
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if !rule.MappingRuleBase.modeCheck(mode) {
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return nil
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}
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// Check each of the inputs, and if we find a match, proceed
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var match RuleTarget
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for _, input := range rule.Inputs {
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if device == input.GetDevice() &&
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event.Code == input.GetCode() {
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match = input
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}
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}
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if match == nil {
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return nil
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}
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// Get the value and add/subtract it from State
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inputValue := match.NormalizeValue(event.Value)
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oldState := rule.State
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if inputValue == 0 {
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rule.State = max(rule.State-1, 0)
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}
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if inputValue == 1 {
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rule.State++
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}
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targetState := len(rule.Inputs)
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if oldState == targetState-1 && rule.State == targetState {
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return rule.Output.CreateEvent(1, mode)
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}
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if oldState == targetState && rule.State == targetState-1 {
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return rule.Output.CreateEvent(0, mode)
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}
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return nil
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}
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func (rule *MappingRuleLatched) MatchEvent(device *evdev.InputDevice, event *evdev.InputEvent, mode *string) *evdev.InputEvent {
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if !rule.MappingRuleBase.modeCheck(mode) {
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return nil
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}
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if device != rule.Input.GetDevice() ||
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event.Code != rule.Input.GetCode() ||
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rule.Input.NormalizeValue(event.Value) == 0 {
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return nil
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}
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// Input is pressed, so toggle state and emit event
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var value int32
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rule.State = !rule.State
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if rule.State {
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value = 1
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} else {
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value = 0
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}
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return rule.Output.CreateEvent(value, mode)
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}
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func (rule *MappingRuleProportionalAxis) MatchEvent(device *evdev.InputDevice, event *evdev.InputEvent, mode *string) *evdev.InputEvent {
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if !rule.MappingRuleBase.modeCheck(mode) {
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return nil
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}
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if device != rule.Input.GetDevice() ||
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event.Code != rule.Input.GetCode() {
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return nil
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}
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// set the last value to the normalized input value
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rule.LastValue = rule.Input.NormalizeValue(event.Value)
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return nil
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}
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// TimerEvent returns an event when enough time has passed (compared to the last recorded axis value)
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// to emit an event.
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func (rule *MappingRuleProportionalAxis) TimerEvent() *evdev.InputEvent {
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// This is tighter coupling than we'd like, but it will do for now.
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// TODO: maybe it would be better to just be more declarative about event types and their inputs and outputs.
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if rule.LastValue < rule.Input.AxisStart {
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rule.LastEvent = time.Now()
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return nil
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}
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// calculate target time until next event press
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// nextEvent := rule.LastEvent + (rule.LastValue)
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// TODO: figure out what the condition should be
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if false {
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// TODO: emit event
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rule.LastEvent = time.Now()
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}
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return nil
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}
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