mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
447 lines
14 KiB
Go
447 lines
14 KiB
Go
// Copyright 2015 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ui
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import (
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"math"
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"strings"
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"syscall/js"
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"unicode"
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)
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var (
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stringAlt = js.ValueOf("Alt")
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stringControl = js.ValueOf("Control")
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stringMeta = js.ValueOf("Meta")
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stringShift = js.ValueOf("Shift")
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stringKeydown = js.ValueOf("keydown")
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stringKeyup = js.ValueOf("keyup")
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stringMousedown = js.ValueOf("mousedown")
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stringMouseup = js.ValueOf("mouseup")
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stringMousemove = js.ValueOf("mousemove")
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stringWheel = js.ValueOf("wheel")
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stringTouchstart = js.ValueOf("touchstart")
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stringTouchend = js.ValueOf("touchend")
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stringTouchmove = js.ValueOf("touchmove")
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)
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type touchInClient struct {
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id TouchID
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x float64
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y float64
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}
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func jsCodeToID(code js.Value) Key {
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// js.Value cannot be used as a map key.
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// As the number of keys is around 100, just a dumb loop should work.
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for uiKey, jsCode := range uiKeyToJSCode {
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if jsCode.Equal(code) {
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return uiKey
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}
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}
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return -1
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}
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var codeToMouseButton = map[int]MouseButton{
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0: MouseButton0, // Left
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1: MouseButton1, // Middle
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2: MouseButton2, // Right
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3: MouseButton3,
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4: MouseButton4,
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}
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func eventToKeys(e js.Value) (key0, key1 Key, fromKeyProperty bool) {
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id := jsCodeToID(e.Get("code"))
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// On mobile browsers, treat enter key as if this is from a `key` property.
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if IsVirtualKeyboard() && id == KeyEnter {
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return KeyEnter, -1, true
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}
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if id >= 0 {
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return id, -1, false
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}
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// With a virtual keyboard on mobile devices, e.code is empty. Use a 'key' property instead (#2898).
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key := e.Get("key")
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// The key property doesn't distinghlish between left and right modifier keys.
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// Let's assume both keys are pressed.
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switch {
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case key.Equal(stringAlt):
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return KeyAltLeft, KeyAltRight, true
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case key.Equal(stringControl):
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return KeyControlLeft, KeyControlRight, true
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case key.Equal(stringMeta):
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return KeyMetaLeft, KeyMetaRight, true
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case key.Equal(stringShift):
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return KeyShiftLeft, KeyShiftRight, true
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}
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for uiKey, jsKey := range uiKeyToJSKey {
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if key.Equal(jsKey) {
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return uiKey, -1, true
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}
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}
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return -1, -1, false
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}
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func (u *UserInterface) keyDown(event js.Value) {
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key0, key1, fromKeyProperty := eventToKeys(event)
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if key0 >= 0 {
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// If the key value comes from a 'key' property, a 'keydown' and 'keyup' event might be fired too quickly.
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// Record the key duration to prevent immediate resetting a key state by a 'keyup' event.
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// Resetting a key state is delayed until the next tick. See updateInputState.
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if fromKeyProperty && !u.inputState.KeyPressed[key0] {
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if u.keyDurationsByKeyProperty == nil {
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u.keyDurationsByKeyProperty = map[Key]int{}
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}
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u.keyDurationsByKeyProperty[key0] = 1
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}
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u.inputState.KeyPressed[key0] = true
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}
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if key1 >= 0 {
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if fromKeyProperty && !u.inputState.KeyPressed[key1] {
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if u.keyDurationsByKeyProperty == nil {
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u.keyDurationsByKeyProperty = map[Key]int{}
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}
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u.keyDurationsByKeyProperty[key1] = 1
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}
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u.inputState.KeyPressed[key1] = true
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}
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}
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func (u *UserInterface) keyUp(event js.Value) {
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key0, key1, fromKeyProperty := eventToKeys(event)
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if key0 >= 0 {
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if !fromKeyProperty || u.keyDurationsByKeyProperty[key0] == 0 {
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u.inputState.KeyPressed[key0] = false
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}
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}
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if key1 >= 0 {
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if !fromKeyProperty || u.keyDurationsByKeyProperty[key1] == 0 {
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u.inputState.KeyPressed[key1] = false
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}
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}
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}
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func (u *UserInterface) mouseDown(code int) {
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u.inputState.MouseButtonPressed[codeToMouseButton[code]] = true
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}
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func (u *UserInterface) mouseUp(code int) {
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u.inputState.MouseButtonPressed[codeToMouseButton[code]] = false
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}
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func (u *UserInterface) updateInputFromEvent(e js.Value) error {
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// Avoid using js.Value.String() as String creates a Uint8Array via a TextEncoder and causes a heavy
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// overhead (#1437).
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switch t := e.Get("type"); {
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case t.Equal(stringKeydown):
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if str := e.Get("key").String(); isKeyString(str) {
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for _, r := range str {
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u.inputState.appendRune(r)
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}
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}
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u.keyDown(e)
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case t.Equal(stringKeyup):
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u.keyUp(e)
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case t.Equal(stringMousedown):
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u.mouseDown(e.Get("button").Int())
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u.setMouseCursorFromEvent(e)
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case t.Equal(stringMouseup):
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u.mouseUp(e.Get("button").Int())
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u.setMouseCursorFromEvent(e)
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case t.Equal(stringMousemove):
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u.setMouseCursorFromEvent(e)
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case t.Equal(stringWheel):
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// TODO: What if e.deltaMode is not DOM_DELTA_PIXEL?
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u.inputState.WheelX = -e.Get("deltaX").Float()
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u.inputState.WheelY = -e.Get("deltaY").Float()
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case t.Equal(stringTouchstart) || t.Equal(stringTouchend) || t.Equal(stringTouchmove):
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u.updateTouchesFromEvent(e)
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}
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u.forceUpdateOnMinimumFPSMode()
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return nil
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}
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func (u *UserInterface) setMouseCursorFromEvent(e js.Value) {
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if u.context == nil {
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return
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}
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u.origCursorXInClient = e.Get("clientX").Float()
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u.origCursorYInClient = e.Get("clientY").Float()
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if u.cursorMode == CursorModeCaptured {
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u.cursorXInClient += e.Get("movementX").Float()
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u.cursorYInClient += e.Get("movementY").Float()
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return
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}
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u.cursorXInClient = u.origCursorXInClient
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u.cursorYInClient = u.origCursorYInClient
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}
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func (u *UserInterface) recoverCursorPosition() {
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u.cursorXInClient = u.origCursorXInClient
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u.cursorYInClient = u.origCursorYInClient
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}
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func (u *UserInterface) updateTouchesFromEvent(e js.Value) {
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u.touchesInClient = u.touchesInClient[:0]
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touches := e.Get("targetTouches")
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for i := 0; i < touches.Length(); i++ {
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t := touches.Call("item", i)
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u.touchesInClient = append(u.touchesInClient, touchInClient{
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id: TouchID(t.Get("identifier").Int()),
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x: t.Get("clientX").Float(),
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y: t.Get("clientY").Float(),
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})
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}
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}
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func isKeyString(str string) bool {
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// From https://www.w3.org/TR/uievents-key/#keys-unicode,
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//
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// A key string is a string containing a 0 or 1 non-control characters
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// ("base" characters) followed by 0 or more combining characters. The
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// string MUST be in Normalized Form C (NFC) as described in
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// [UnicodeNormalizationForms].
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//
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// A non-control character is any valid Unicode character except those
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// that are part of the "Other, Control" ("Cc") General Category.
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//
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// A combining character is any valid Unicode character in the "Mark,
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// Spacing Combining" ("Mc") General Category or with a non-zero
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// Combining Class.
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for i, r := range str {
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if i == 0 {
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if unicode.Is(unicode.Cc, r) {
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return false
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}
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continue
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}
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if !unicode.Is(unicode.Mc, r) {
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return false
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}
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}
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return true
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}
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var (
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jsKeyboard = js.Global().Get("navigator").Get("keyboard")
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jsKeyboardGetLayoutMap js.Value
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jsKeyboardGetLayoutMapCh chan js.Value
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jsKeyboardGetLayoutMapCallback js.Func
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)
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func init() {
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if !jsKeyboard.Truthy() {
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return
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}
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jsKeyboardGetLayoutMap = jsKeyboard.Get("getLayoutMap").Call("bind", jsKeyboard)
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jsKeyboardGetLayoutMapCh = make(chan js.Value, 1)
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jsKeyboardGetLayoutMapCallback = js.FuncOf(func(this js.Value, args []js.Value) any {
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jsKeyboardGetLayoutMapCh <- args[0]
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return nil
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})
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}
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func (u *UserInterface) KeyName(key Key) string {
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if !u.isRunning() {
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return ""
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}
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// keyboardLayoutMap is reset every tick.
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if u.keyboardLayoutMap.IsUndefined() {
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if !jsKeyboard.Truthy() {
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return ""
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}
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// Invoke getLayoutMap every tick to detect the keyboard change.
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// TODO: Calling this every tick might be inefficient. Is there a way to detect a keyboard change?
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jsKeyboardGetLayoutMap.Invoke().Call("then", jsKeyboardGetLayoutMapCallback)
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u.keyboardLayoutMap = <-jsKeyboardGetLayoutMapCh
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}
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n := u.keyboardLayoutMap.Call("get", uiKeyToJSCode[key])
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if n.IsUndefined() {
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return ""
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}
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return n.String()
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}
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func (u *UserInterface) UpdateInputFromEvent(e js.Value) {
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u.updateInputFromEvent(e)
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}
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func (u *UserInterface) saveCursorPosition() {
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u.savedCursorX = u.inputState.CursorX
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u.savedCursorY = u.inputState.CursorY
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w, h := u.outsideSize()
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u.savedOutsideWidth = w
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u.savedOutsideHeight = h
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}
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func (u *UserInterface) updateInputState() error {
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// Reset the key state if a key is pressed by a 'key' property and the key's duration is big enough.
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for key, duration := range u.keyDurationsByKeyProperty {
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if duration >= 2 {
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delete(u.keyDurationsByKeyProperty, key)
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u.inputState.KeyPressed[key] = false
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continue
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}
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u.keyDurationsByKeyProperty[key]++
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}
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s := theMonitor.DeviceScaleFactor()
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if !math.IsNaN(u.savedCursorX) && !math.IsNaN(u.savedCursorY) {
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// If savedCursorX and savedCursorY are valid values, the cursor is saved just before entering or exiting from fullscreen.
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// Even after entering or exiting from fullscreening, the outside (body) size is not updated for a while.
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// Wait for the outside size updated.
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if w, h := u.outsideSize(); u.savedOutsideWidth != w || u.savedOutsideHeight != h {
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u.inputState.CursorX = u.savedCursorX
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u.inputState.CursorY = u.savedCursorY
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cx, cy := u.context.logicalPositionToClientPosition(u.inputState.CursorX, u.inputState.CursorY, s)
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u.cursorXInClient = cx
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u.cursorYInClient = cy
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u.savedCursorX = math.NaN()
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u.savedCursorY = math.NaN()
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u.savedOutsideWidth = 0
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u.savedOutsideHeight = 0
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u.outsideSizeUnchangedCount = 0
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} else {
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u.outsideSizeUnchangedCount++
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// If the outside size is not changed for a while, probably the screen size is not actually changed.
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// Reset the state.
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if u.outsideSizeUnchangedCount > 60 {
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u.savedCursorX = math.NaN()
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u.savedCursorY = math.NaN()
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u.savedOutsideWidth = 0
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u.savedOutsideHeight = 0
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u.outsideSizeUnchangedCount = 0
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}
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}
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} else {
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cx, cy := u.context.clientPositionToLogicalPosition(u.cursorXInClient, u.cursorYInClient, s)
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u.inputState.CursorX = cx
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u.inputState.CursorY = cy
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}
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u.inputState.Touches = u.inputState.Touches[:0]
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for _, t := range u.touchesInClient {
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x, y := u.context.clientPositionToLogicalPosition(t.x, t.y, s)
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u.inputState.Touches = append(u.inputState.Touches, Touch{
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ID: t.id,
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X: int(x),
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Y: int(y),
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})
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}
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return nil
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}
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// uiKeyToJSKey is a map from Key values to KeyboardEvent's key values.
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// Note that js.Value cannot be a map key.
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//
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// Reference: https://developer.mozilla.org/en-US/docs/Web/API/UI_Events/Keyboard_event_key_values
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var uiKeyToJSKey = map[Key]js.Value{
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KeyCapsLock: js.ValueOf("CapsLock"),
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KeyNumLock: js.ValueOf("NumLock"),
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KeyScrollLock: js.ValueOf("ScrollLock"),
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KeyEnter: js.ValueOf("Enter"),
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KeyTab: js.ValueOf("Tab"),
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KeySpace: js.ValueOf(" "),
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KeyArrowDown: js.ValueOf("ArrowDown"),
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KeyArrowLeft: js.ValueOf("ArrowLeft"),
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KeyArrowRight: js.ValueOf("ArrowRight"),
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KeyArrowUp: js.ValueOf("ArrowUp"),
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KeyEnd: js.ValueOf("End"),
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KeyHome: js.ValueOf("Home"),
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KeyPageDown: js.ValueOf("PageDown"),
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KeyPageUp: js.ValueOf("PageUp"),
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KeyBackspace: js.ValueOf("Backspace"),
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KeyDelete: js.ValueOf("Delete"),
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KeyInsert: js.ValueOf("Insert"),
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KeyContextMenu: js.ValueOf("ContextMenu"),
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KeyEscape: js.ValueOf("Escape"),
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KeyPause: js.ValueOf("Pause"),
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KeyPrintScreen: js.ValueOf("PrintScreen"),
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KeyF1: js.ValueOf("F1"),
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KeyF2: js.ValueOf("F2"),
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KeyF3: js.ValueOf("F3"),
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KeyF4: js.ValueOf("F4"),
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KeyF5: js.ValueOf("F5"),
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KeyF6: js.ValueOf("F6"),
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KeyF7: js.ValueOf("F7"),
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KeyF8: js.ValueOf("F8"),
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KeyF9: js.ValueOf("F9"),
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KeyF10: js.ValueOf("F10"),
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KeyF11: js.ValueOf("F11"),
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KeyF12: js.ValueOf("F12"),
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KeyF13: js.ValueOf("F13"),
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KeyF14: js.ValueOf("F14"),
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KeyF15: js.ValueOf("F15"),
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KeyF16: js.ValueOf("F16"),
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KeyF17: js.ValueOf("F17"),
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KeyF18: js.ValueOf("F18"),
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KeyF19: js.ValueOf("F19"),
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KeyF20: js.ValueOf("F20"),
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KeyNumpadDecimal: js.ValueOf("Decimal"),
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KeyNumpadMultiply: js.ValueOf("Multiply"),
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KeyNumpadAdd: js.ValueOf("Add"),
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KeyNumpadDivide: js.ValueOf("Divide"),
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KeyNumpadSubtract: js.ValueOf("Subtract"),
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KeyNumpad0: js.ValueOf("0"),
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KeyNumpad1: js.ValueOf("1"),
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KeyNumpad2: js.ValueOf("2"),
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KeyNumpad3: js.ValueOf("3"),
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KeyNumpad4: js.ValueOf("4"),
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KeyNumpad5: js.ValueOf("5"),
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KeyNumpad6: js.ValueOf("6"),
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KeyNumpad7: js.ValueOf("7"),
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KeyNumpad8: js.ValueOf("8"),
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KeyNumpad9: js.ValueOf("9"),
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}
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func (i *InputState) resetForBlur() {
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for j := range i.KeyPressed {
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i.KeyPressed[j] = false
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}
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for j := range i.MouseButtonPressed {
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i.MouseButtonPressed[j] = false
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}
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i.Touches = i.Touches[:0]
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}
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func IsVirtualKeyboard() bool {
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// Detect a virtual keyboard by the user agent.
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// Note that this is not a correct way to detect a virtual keyboard.
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// In the future, we should use the `navigator.virtualKeyboard` API.
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// https://developer.mozilla.org/en-US/docs/Web/API/Navigator/virtualKeyboard
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ua := js.Global().Get("navigator").Get("userAgent").String()
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if strings.Contains(ua, "Android") || strings.Contains(ua, "iPhone") || strings.Contains(ua, "iPad") || strings.Contains(ua, "iPod") {
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return true
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}
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return false
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}
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