鼠标事件处理代码,GO代码库,德仔网

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【GO】鼠标事件处理
作者:akang / 发布于2015/10/19/ 895

	package main
	
	import (
	 "fmt"
	 "os"
	
	 "github.com/veandco/go-sdl2/sdl"
	 sdlImg "github.com/veandco/go-sdl2/sdl_image"
	 sdlTtf "github.com/veandco/go-sdl2/sdl_ttf"
	)
	
	// 全局变量
	var gWindow *sdl.Window
	
	// 渲染器
	var gRenderer *sdl.Renderer
	
	// 设定窗口
	var screenWidth, screenHeight int32 = 640, 480
	
	// 标题设定
	var windowTitle = "SDL2 Tutorial tu 17 mouse "
	
	// 图片纹理
	var gArrowTexture LTexture
	
	// 全局字体
	var gFont *sdlTtf.Font
	
	// 字体纹理
	var gTextTexture LTexture
	
	// 按钮大小
	var buttonWidth, buttonHeight int32 = 300, 200
	
	// 按钮数量
	const totalButtons int = 4
	
	// button clips
	var gSpriteClips [totalButtons]sdl.Rect
	var gButtonSpriteSheetTexture LTexture
	
	//------------
	
	// 纹理对象
	type LTexture struct {
	 mTexture *sdl.Texture
	 mWidth int32
	 mHeight int32
	}
	
	// 默认空纹理
	func newLTexture() (l LTexture) {
	 return LTexture{
	 mTexture: nil,
	 mHeight: 0,
	 mWidth: 0,
	 }
	}
	
	func (l *LTexture) LoadFromFile(src string) (err error) {
	 l.Free()
	
	 var loadedSurface *sdl.Surface
	 var newTexture *sdl.Texture
	
	 // PNG 图片资源加载
	 loadedSurface, err = sdlImg.Load(src)
	 if err != nil {
	 fmt.Println("加载PNG资源错误，Error：", err)
	 }
	
	 // Color key image 设置透明元素
	 loadedSurface.SetColorKey(1, sdl.MapRGB(loadedSurface.Format, 0, 0xFF, 0xFF))
	 newTexture, err = gRenderer.CreateTextureFromSurface(loadedSurface)
	 if err != nil {
	 fmt.Println("纹理渲染失败，Error:", err)
	 return err
	 }
	 l.mTexture = newTexture
	 l.mHeight = loadedSurface.H
	 l.mWidth = loadedSurface.W
	 loadedSurface.Free()
	 return nil
	}
	
	// 加载字体纹理
	func (l *LTexture) LoadFromText(str string, textColor sdl.Color) (err error) {
	 l.Free()
	
	 var textSurface *sdl.Surface
	 var newTexture *sdl.Texture
	
	 textSurface, err = gFont.RenderUTF8_Solid(str, textColor)
	 if err != nil {
	 fmt.Println("无法渲染字体对象！sdl ttf Error:", err, ":", sdlTtf.GetError())
	 return err
	 }
	
	 newTexture, err = gRenderer.CreateTextureFromSurface(textSurface)
	 if err != nil {
	 fmt.Println("纹理渲染失败，Error:", err)
	 return err
	 }
	 l.mTexture = newTexture
	 l.mWidth = textSurface.W
	 l.mHeight = textSurface.H
	
	 textSurface.Free()
	 return nil
	}
	
	// 释放
	func (l *LTexture) Free() {
	 if l.mTexture != nil {
	 l.mTexture.Destroy()
	 l.mWidth = 0
	 l.mHeight = 0
	 }
	}
	
	// 设定调节侧才
	func (l *LTexture) SetColor(r, g, b uint8) {
	 l.mTexture.SetColorMod(r, g, b)
	}
	
	// 调节混合
	func (l *LTexture) SetBlendMode(blending sdl.BlendMode) {
	 l.mTexture.SetBlendMode(blending)
	}
	
	// 透明调节
	func (l *LTexture) SetAlpha(alpha uint8) {
	 l.mTexture.SetAlphaMod(alpha)
	}
	
	// 渲染 切割渲染
	func (l *LTexture) Render(x, y int32, clip *sdl.Rect) {
	 dst := sdl.Rect{X: x, Y: y, W: l.mWidth, H: l.mHeight}
	 if !clip.Empty() {
	 dst.W = clip.W
	 dst.H = clip.H
	 }
	 gRenderer.Copy(l.mTexture, clip, &dst)
	}
	
	// 渲染 旋转和翻转
	func (l *LTexture) RenderEx(x, y int32, clip *sdl.Rect, angle float64, center *sdl.Point, flip sdl.RendererFlip) {
	 dst := sdl.Rect{X: x, Y: y, W: l.mWidth, H: l.mHeight}
	 if !clip.Empty() {
	 dst.W = clip.W
	 dst.H = clip.H
	 }
	 // (l.mTexture, clip, &dst)
	 gRenderer.CopyEx(l.mTexture, clip, &dst, angle, center, flip)
	}
	
	type LButtonSprite int
	
	const (
	 BUTTON_SPRITE_MOUSE_OUT = iota
	 BUTTON_SPRITE_MOUSE_OVER_MOTION
	 BUTTON_SPRITE_MOUSE_DOWN
	 BUTTON_SPRITE_MOUSE_UP
	 BUTTON_SPRITE_TOTAL
	)
	
	var gButton [totalButtons]LButton
	
	// 鼠标按钮对象
	// b := LButton{ mPostion: sdl.Point{X:0,Y:0}, mCurrentSprite: BUTTON_SPRITE_MOUSE_OUT }
	type LButton struct {
	 mPostion sdl.Point
	 mCurrentSprite int
	}
	
	func newLButton(x, y int32) (b LButton) {
	 return LButton{
	 mPostion: sdl.Point{X: x, Y: y},
	 mCurrentSprite: BUTTON_SPRITE_MOUSE_OUT,
	 }
	}
	
	// 设定 top,left 坐标
	func (b *LButton) setPosition(x, y int32) {
	 b.mPostion = sdl.Point{X: x, Y: y}
	}
	
	// 鼠标移动事件触发
	func (b *LButton) handleEvent(x, y int32, t uint32) {
	
	 var inside bool = true
	 // 鼠标在左边
	
	 switch {
	 case x < b.mPostion.X:
	 inside = false
	 break
	 case x > (b.mPostion.X + buttonWidth):
	 inside = false
	 break
	 case y < b.mPostion.Y:
	 inside = false
	 break
	 case y > (b.mPostion.Y + buttonHeight):
	 inside = false
	 break
	 }
	
	 if !inside {
	 b.mCurrentSprite = BUTTON_SPRITE_MOUSE_OUT
	 } else {
	 switch t {
	 case sdl.MOUSEMOTION:
	 b.mCurrentSprite = BUTTON_SPRITE_MOUSE_OVER_MOTION
	 break
	 case sdl.MOUSEBUTTONDOWN:
	 b.mCurrentSprite = BUTTON_SPRITE_MOUSE_DOWN
	 break
	 case sdl.MOUSEBUTTONUP:
	 b.mCurrentSprite = BUTTON_SPRITE_MOUSE_UP
	 break
	 }
	 }
	
	}
	
	func (b *LButton) render() {
	 gButtonSpriteSheetTexture.Render(b.mPostion.X, b.mPostion.Y, &gSpriteClips[b.mCurrentSprite])
	}
	
	// 初始化
	func sdlinit() (err error) {
	 // 初始化
	 if err = sdl.Init(sdl.INIT_AUDIO); err != nil {
	 fmt.Println("初始化失败 !Error:", err)
	 return err
	 }
	
	 // 设置线性纹理优先级
	 if !sdl.SetHint(sdl.HINT_RENDER_SCALE_QUALITY, "1") {
	 fmt.Println()
	 }
	
	 gWindow, err = sdl.CreateWindow(windowTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, int(screenWidth), int(screenHeight), sdl.WINDOW_SHOWN)
	 if err != nil {
	 fmt.Println("window 创建失败！Error:", err)
	 return err
	 }
	 // defer window.Destroy()
	
	 // 渲染器
	 gRenderer, err = sdl.CreateRenderer(gWindow, -1, sdl.RENDERER_PRESENTVSYNC)
	 if err != nil {
	 fmt.Println("无法创建渲染器 ", err)
	 return err
	 }
	
	 gRenderer.SetDrawColor(0xFF, 0xFF, 0xFF, 0xFF)
	
	 // 检测是否支持PNG
	 if i := sdlImg.Init(sdlImg.INIT_PNG); i < 0 {
	 fmt.Println("图片加载器PNG失败! Error", sdlImg.GetError())
	 return err
	 }
	
	 if err = sdlTtf.Init(); err != nil {
	 fmt.Println("字体无法初始化！Error:", err)
	 return err
	 }
	
	 return nil
	}
	
	// 加载媒体
	func loadMedia() (err error) {
	 gButtonSpriteSheetTexture = newLTexture()
	 err = gButtonSpriteSheetTexture.LoadFromFile("button.png")
	 if err != nil {
	 fmt.Println("加载按钮失败！")
	 return
	 }
	
	 // 切片设定
	 for i := 0; i < BUTTON_SPRITE_TOTAL; i++ {
	 gSpriteClips[i] = sdl.Rect{X: 0, Y: int32(i * 200), W: buttonWidth, H: buttonHeight}
	 }
	
	 // 设定位置
	 gButton[0] = newLButton(0, 0)
	 gButton[1] = newLButton(screenWidth-buttonWidth, 0)
	 gButton[2] = newLButton(0, screenHeight-buttonHeight)
	 gButton[3] = newLButton(screenWidth-buttonWidth, screenHeight-buttonHeight)
	
	 fmt.Println(gButton)
	 return nil
	}
	
	// 资源注销
	func close() {
	 gButtonSpriteSheetTexture.Free()
	
	 gRenderer.Destroy()
	 gWindow.Destroy()
	
	 sdlImg.Quit()
	 sdl.Quit()
	}
	
	// 监听
	func listen() {
	 var event sdl.Event
	 var running bool
	
	 running = true
	 for running {
	 for event = sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
	 switch t := event.(type) {
	 case *sdl.QuitEvent:
	 // 结束事件
	 running = false
	 case *sdl.MouseMotionEvent:
	 for i := 0; i < totalButtons; i++ {
	 gButton[i].handleEvent(t.X, t.Y, t.Type)
	 }
	 break
	 case *sdl.MouseButtonEvent:
	 for i := 0; i < totalButtons; i++ {
	 gButton[i].handleEvent(t.X, t.Y, t.Type)
	 }
	 break
	 }
	
	 }
	
	 updateRender()
	
	 }
	}
	
	// 更新处理
	func updateRender() {
	 // 清空屏幕
	 gRenderer.SetDrawColor(0xFF, 0xFF, 0xFF, 0xFF)
	 gRenderer.Clear()
	
	 for i := 0; i < totalButtons; i++ {
	 gButton[i].render()
	 }
	
	 // 更新渲染器
	 gRenderer.Present()
	}
	
	func main() {
	 if sdlinit() != nil {
	 fmt.Println("初始化失败！")
	 os.Exit(0)
	 }
	
	 if loadMedia() != nil {
	 fmt.Println("加载媒体失败！")
	 os.Exit(1)
	 }
	
	 listen()
	
	 // sdl.Delay(5000)
	 close()
	}
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