doodle/events/events.go

104 lines
2.5 KiB
Go

// Package events manages mouse and keyboard SDL events for Doodle.
package events
import (
"errors"
"github.com/veandco/go-sdl2/sdl"
)
// State keeps track of event states.
type State struct {
// Mouse buttons.
Button1 *BoolFrameState
Button2 *BoolFrameState
// Cursor positions.
CursorX *Int32FrameState
CursorY *Int32FrameState
}
// New creates a new event state manager.
func New() *State {
return &State{
Button1: &BoolFrameState{},
Button2: &BoolFrameState{},
CursorX: &Int32FrameState{},
CursorY: &Int32FrameState{},
}
}
// Poll for events.
func (s *State) Poll(ticks uint64) (*State, error) {
for event := sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
return s, errors.New("quit")
case *sdl.MouseMotionEvent:
if DebugMouseEvents {
log.Debug("[%d ms] tick:%d MouseMotion type:%d id:%d x:%d y:%d xrel:%d yrel:%d",
t.Timestamp, ticks, t.Type, t.Which, t.X, t.Y, t.XRel, t.YRel,
)
}
// Push the cursor position.
s.CursorX.Push(t.X)
s.CursorY.Push(t.Y)
s.Button1.Push(t.State == 1)
case *sdl.MouseButtonEvent:
if DebugClickEvents {
log.Debug("[%d ms] tick:%d MouseButton type:%d id:%d x:%d y:%d button:%d state:%d",
t.Timestamp, ticks, t.Type, t.Which, t.X, t.Y, t.Button, t.State,
)
}
// Push the cursor position.
s.CursorX.Push(t.X)
s.CursorY.Push(t.Y)
// Is a mouse button pressed down?
if t.Button == 1 {
var eventName string
if DebugClickEvents {
if t.State == 1 && s.Button1.Now == false {
eventName = "DOWN"
} else if t.State == 0 && s.Button1.Now == true {
eventName = "UP"
}
}
if eventName != "" {
log.Debug("tick:%d Mouse Button1 %s BEFORE: %+v",
ticks,
eventName,
s.Button1,
)
s.Button1.Push(eventName == "DOWN")
log.Debug("tick:%d Mouse Button1 %s AFTER: %+v",
ticks,
eventName,
s.Button1,
)
// Return the event immediately.
return s, nil
}
}
// s.Button2.Push(t.Button == 3 && t.State == 1)
case *sdl.MouseWheelEvent:
if DebugMouseEvents {
log.Debug("[%d ms] tick:%d MouseWheel type:%d id:%d x:%d y:%d",
t.Timestamp, ticks, t.Type, t.Which, t.X, t.Y,
)
}
case *sdl.KeyboardEvent:
log.Debug("[%d ms] tick:%d Keyboard type:%d sym:%c modifiers:%d state:%d repeat:%d\n",
t.Timestamp, ticks, t.Type, t.Keysym.Sym, t.Keysym.Mod, t.State, t.Repeat,
)
}
}
return s, nil
}