Compose Multiplatform+Kotlin Multiplatfrom 第五弹跨平台 截图

截图功能

  Compose Multiplatform+Kotlin Multiplatfrom下实现桌面端的截图功能，起码搞了两星期，最后终于做出来了，操作都很流畅，截取的文件大小也正常，可参考支持讨论！

功能效果

代码实现

//在jvmMain下创建TestCapture11.kt，完整的截图核心功能代码

package com.hwj.ai.capture

import androidx.compose.foundation.Canvas
import androidx.compose.foundation.focusable
import androidx.compose.foundation.gestures.detectDragGestures
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.material3.Button
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.awt.ComposeWindow
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Rect
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.input.key.Key
import androidx.compose.ui.input.key.key
import androidx.compose.ui.input.key.onPreviewKeyEvent
import androidx.compose.ui.input.pointer.PointerEventType
import androidx.compose.ui.input.pointer.isSecondaryPressed
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.unit.DpSize
import androidx.compose.ui.unit.dp
import androidx.compose.ui.window.Window
import androidx.compose.ui.window.WindowPosition
import androidx.compose.ui.window.rememberWindowState
import com.hwj.ai.global.printD
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import java.awt.GraphicsEnvironment
import java.awt.Rectangle
import java.awt.Robot
import java.awt.Toolkit
import java.awt.image.BufferedImage
import java.io.File
import javax.imageio.ImageIO

//UI 拖拽得到的坐标 * scaleFactor ≠ 实际屏幕坐标
//macOS 多屏/高DPI 下 Robot 截图区域
//效果suc,windows/macOS 主屏幕
class ScreenshotState11 {
   
   
    var startOffset by mutableStateOf(Offset.Zero)
    var endOffset by mutableStateOf(Offset.Zero)
    val selectionRect: Rect
        get() = Rect(startOffset, endOffset)
    var isSelecting by mutableStateOf(false)
}

val LocalMainWindow = staticCompositionLocalOf<ComposeWindow> {
   
    error("No Window provided")