A: Add gif play component

cef/gifplay.go

@@ -0,0 +1,165 @@
+//----------------------------------------
+//
+// Copyright © yanghy. All Rights Reserved.
+//
+// Licensed under Apache License Version 2.0, January 2004
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+//----------------------------------------
+
+package cef
+
+import (
+	"bytes"
+	"github.com/energye/golcl/energy/emfs"
+	"github.com/energye/golcl/lcl"
+	"image/gif"
+	"os"
+)
+
+// TGIFPlay GIF 图片播放组件
+type TGIFPlay struct {
+	*lcl.TImage              // 展示每帧图像
+	cache        [][]byte    // gif缓存
+	cacheCount   int         //
+	autoPlay     bool        // 自动默认，默认 true
+	currentFrame int         // 当前帧
+	playTask     *lcl.TTimer // 播放任务
+}
+
+// NewGIFPlay 创建一个GIFPlay
+func NewGIFPlay(owner lcl.IComponent) *TGIFPlay {
+	m := &TGIFPlay{
+		playTask: lcl.NewTimer(owner),
+	}
+	m.TImage = lcl.NewImage(owner)
+	m.playTask.SetInterval(66)
+	m.playTask.SetEnabled(false)
+	m.play()
+	return m
+}
+
+// IsValid 返回GIFPlay是否有效
+func (m *TGIFPlay) IsValid() bool {
+	return m.playTask != nil && m.TImage.IsValid()
+}
+
+func (m *TGIFPlay) play() {
+	m.playTask.SetOnTimer(func(sender lcl.IObject) {
+		if m.cacheCount == 0 || m.cache == nil {
+			return
+		}
+		if m.currentFrame >= m.cacheCount {
+			m.currentFrame = 0
+		}
+		m.Picture().LoadFromBytes(m.cache[m.currentFrame])
+		m.currentFrame++
+	})
+}
+
+// Free 停止播放并释放掉这个GIFPlay, 释放后将不可用
+func (m *TGIFPlay) Free() {
+	m.Stop()
+	m.playTask = nil
+	m.TImage.Free()
+	m.cache = nil
+}
+
+// Stop 在当前帧停止播放
+func (m *TGIFPlay) Stop() {
+	if m.playTask != nil {
+		m.playTask.SetEnabled(false)
+	}
+}
+
+// Start 在当前帧开始播放
+func (m *TGIFPlay) Start() {
+	if m.playTask != nil {
+		m.playTask.SetEnabled(true)
+	}
+}
+
+// PlaybackSpeed 设置播放速度，毫秒 默认 66
+func (m *TGIFPlay) PlaybackSpeed(playbackSpeed uint32) {
+	if m.playTask != nil {
+		m.playTask.SetInterval(playbackSpeed)
+	}
+}
+
+// LoadFile 在本地加载GIF
+func (m *TGIFPlay) LoadFile(filePath string) {
+	if m.playTask == nil {
+		return
+	}
+	file, err := os.Open(filePath)
+	if err != nil {
+		panic(err.Error())
+	}
+	defer file.Close()
+	frames, err := gif.DecodeAll(file)
+	if err != nil {
+		panic(err)
+	}
+	m.cacheGIFFrames(frames)
+}
+
+// LoadFSFile 在内置FS中加载GIF
+func (m *TGIFPlay) LoadFSFile(filePath string) {
+	if m.playTask == nil {
+		return
+	}
+	data, err := emfs.GetResources(filePath)
+	if err != nil {
+		panic(err.Error())
+	}
+	m.LoadBytes(data)
+}
+
+// LoadBytes 在图片字节里加载GIF
+func (m *TGIFPlay) LoadBytes(data []byte) {
+	if m.playTask == nil {
+		return
+	}
+	var buf bytes.Buffer
+	buf.Write(data)
+	frames, err := gif.DecodeAll(&buf)
+	if err != nil {
+		panic(err)
+	}
+	defer buf.Reset()
+	m.cacheGIFFrames(frames)
+}
+
+// CacheFrames 返回所有帧
+func (m *TGIFPlay) CacheFrames() [][]byte {
+	return m.cache
+}
+
+func (m *TGIFPlay) AppendFrame(data []byte) {
+
+}
+
+func (m *TGIFPlay) RemoveFrame(index int) {
+
+}
+
+func (m *TGIFPlay) InsertFrame(index int, data []byte) {
+
+}
+
+func (m *TGIFPlay) cacheGIFFrames(frames *gif.GIF) {
+	if m.playTask == nil {
+		return
+	}
+	m.cacheCount = len(frames.Image)
+	m.cache = make([][]byte, m.cacheCount)
+	for i, img := range frames.Image {
+		var buf bytes.Buffer
+		err := gif.Encode(&buf, img, nil)
+		if err != nil {
+			panic(err.Error())
+		}
+		m.cache[i] = buf.Bytes()
+	}
+}