mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
// Copyright 2023 The Ebitengine Authors
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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 textinput provides a text-inputting controller.
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// This package is experimental and the API might be changed in the future.
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//
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// This package is supported by macOS and Web browsers so far.
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package textinput
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import (
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"unicode/utf16"
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"github.com/hajimehoshi/ebiten/v2/internal/ui"
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)
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// State represents the current state of text inputting.
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//
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// State is the low-level API. For most use cases, Field is easier to use.
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type State struct {
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// Text represents the current inputting text.
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Text string
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// CompositionSelectionStartInBytes represents the start position of the selection in bytes.
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CompositionSelectionStartInBytes int
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// CompositionSelectionStartInBytes represents the end position of the selection in bytes.
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CompositionSelectionEndInBytes int
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// Committed reports whether the current Text is the settled text.
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Committed bool
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// Error is an error that happens during text inputting.
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Error error
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}
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// Start starts text inputting.
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// Start returns a channel to send the state repeatedly, and a function to end the text inputting.
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//
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// Start is the low-level API. For most use cases, Field is easier to use.
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//
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// Start returns nil and nil if the current environment doesn't support this package.
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func Start(x, y int) (states chan State, close func()) {
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cx, cy := ui.Get().LogicalPositionToClientPositionInNativePixels(float64(x), float64(y))
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return theTextInput.Start(int(cx), int(cy))
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}
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func convertUTF16CountToByteCount(text string, c int) int {
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return len(string(utf16.Decode(utf16.Encode([]rune(text))[:c])))
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}
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type session struct {
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ch chan State
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done chan struct{}
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}
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func newSession() *session {
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return &session{
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ch: make(chan State, 1),
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done: make(chan struct{}),
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}
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}
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func (s *session) end() {
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if s.ch == nil {
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return
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}
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close(s.ch)
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s.ch = nil
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close(s.done)
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}
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func (s *session) trySend(state State) {
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for {
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select {
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case s.ch <- state:
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return
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default:
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// Only the last value matters.
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select {
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case <-s.ch:
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case <-s.done:
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return
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}
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}
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}
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}
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