活动海报轮播

app/src/main/java/com/gyf/csams/ui/Base.kt

@@ -1,22 +1,29 @@
 package com.gyf.csams.ui
 
 import androidx.annotation.DrawableRes
+import androidx.compose.animation.Crossfade
 import androidx.compose.animation.animateColor
 import androidx.compose.animation.core.*
-import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.Image
-import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.*
-import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.material.*
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.NavController
 import androidx.navigation.compose.navigate
 import androidx.navigation.compose.rememberNavController
 import com.gyf.csams.R
+import com.gyf.csams.ui.model.CarouselViewModel
+import com.gyf.csams.ui.model.MarqueeViewModel
 import com.gyf.csams.ui.theme.CSAMSTheme
 
 /**
@@ -57,6 +64,14 @@ enum class MainMenu(@DrawableRes val selectedIcon:Int,
     Center(R.drawable.ic_account_fill,R.drawable.ic_account)
 }
 
+/**
+ * 底部菜单按钮
+ *
+ * @param _menu
+ * @param menu
+ * @param modifier
+ * @param onClick
+ */
 @Composable
 fun MenuIconButton(_menu: MainMenu,menu: MainMenu,modifier: Modifier,onClick: () -> Unit){
     Row(modifier = modifier
@@ -70,8 +85,15 @@ fun MenuIconButton(_menu: MainMenu,menu: MainMenu,modifier: Modifier,onClick: ()
     }
 }
 
+/**
+ * 底部菜单
+ *
+ * @param menu
+ * @param nav
+ * @param modifier
+ */
 @Composable
-fun MyBottomAppBar(menu:MainMenu,nav: NavController,modifier: Modifier=Modifier){
+fun MainBottomAppBar(menu:MainMenu, nav: NavController, modifier: Modifier=Modifier){
     BottomAppBar(backgroundColor = Color.White,modifier=modifier) {
         //图标宽度平等分
 
@@ -89,6 +111,102 @@ fun MyBottomAppBar(menu:MainMenu,nav: NavController,modifier: Modifier=Modifier)
 
 }
 
+/**
+ * 跑马灯
+ *
+ * @param model
+ * @param content
+ */
+@Composable
+fun Marquee(model: MarqueeViewModel = viewModel(), content: @Composable BoxScope.(model: MarqueeViewModel,
+                                                                                  value: State<Float>
+) -> Unit) {
+
+    val delayMillis=2000
+    Column {
+        BoxWithConstraints {
+            val transition = rememberInfiniteTransition()
+            val maxWidth = maxWidth + 30.dp
+            val offset = transition.animateFloat(
+                initialValue = 0F,
+                targetValue = maxWidth.value,
+                animationSpec = infiniteRepeatable(
+                    animation = tween(durationMillis = 3000, delayMillis = delayMillis),
+                    repeatMode = RepeatMode.Restart
+                )
+            )
+            Box(modifier = Modifier.fillMaxWidth()) {
+                content(model = model, value = offset)
+            }
+
+            if (offset.value.toInt() == maxWidth.value.toInt()) {
+                model.addAsync(delayMillis = delayMillis)
+            }
+        }
+    }
+}
+
+
+@Composable
+fun MarqueeText(model: MarqueeViewModel = viewModel(), offset: State<Float>) {
+    val poetryIndex: Int by model.marqueeIndex.observeAsState(0)
+
+//        Text(text = "$poetryIndex")
+//        Text(text = "offset.value=${offset.value}")
+    Text(
+        text = model.marqueeTexts[poetryIndex % model.marqueeTexts.size],
+        modifier = Modifier.offset(x = offset.value.dp),
+        maxLines = 1,
+        overflow = TextOverflow.Ellipsis
+    )
+
+}
+
+/**
+ * 图片轮播
+ *
+ */
+@Composable
+fun Carousel(
+    model: CarouselViewModel = viewModel(),
+    durationMillis: Int = 2000,
+    content: @Composable (id: Int) -> Unit
+) {
+    val index: Int by model.index.observeAsState(0)
+    Crossfade(targetState = index, animationSpec = tween(durationMillis = durationMillis)) {
+        content(id = model.imageList[it])
+    }
+}
+
+@Preview
+@Composable
+fun CarouselPreview() {
+    val model = CarouselViewModel()
+//    ClubActivitiesImage(model = model)
+
+
+    Carousel(model = model) {
+        Card(
+            modifier = Modifier
+                .height(300.dp)
+                .fillMaxWidth()
+//            .rotate(180F)
+        ) {
+            Image(
+                painter = painterResource(id = R.drawable.hot_activity_background),
+                contentDescription = null
+            )
+
+            Image(
+                painter = painterResource(id = it),
+                contentDescription = null
+            )
+        }
+    }
+}
+
+
+
 @Preview
 @Composable
 fun AnimationTextPreview(){
@@ -101,7 +219,7 @@ fun MyBottomAppBarPreview(){
     val nav= rememberNavController()
     CSAMSTheme {
         Surface(color = MaterialTheme.colors.background) {
-            MyBottomAppBar(menu = MainMenu.Main, nav = nav)
+            MainBottomAppBar(menu = MainMenu.Main, nav = nav)
         }
     }
 }

app/src/main/java/com/gyf/csams/ui/MainActivity.kt

@@ -3,30 +3,26 @@ package com.gyf.csams.ui
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
-import androidx.compose.animation.core.*
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.border
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.*
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.State
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.rotate
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.text.style.TextOverflow
-import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
 import com.gyf.csams.R
-import com.gyf.csams.ui.model.MainViewModel
+import com.gyf.csams.ui.model.CarouselViewModel
+import com.gyf.csams.ui.model.MarqueeViewModel
 import com.gyf.csams.ui.theme.CSAMSTheme
 
 
@@ -63,7 +59,11 @@ fun Body() {
                             ClubActivitiesTitle()
                             Spacer(modifier = Modifier.height(10.dp))
                             Column(Modifier.rotate(180F)) {
-                                MyBottomAppBar(MainMenu.Main, navController, Modifier.rotate(180F))
+                                MainBottomAppBar(
+                                    MainMenu.Main,
+                                    navController,
+                                    Modifier.rotate(180F)
+                                )
                                 ClubActivitiesImage()
                             }
                         }
@@ -72,7 +72,7 @@ fun Body() {
                 composable(MainMenu.List.name) {
                     Box(modifier = Modifier.fillMaxSize()) {
                         Column(Modifier.rotate(180F)) {
-                            MyBottomAppBar(MainMenu.List, navController, Modifier.rotate(180F))
+                            MainBottomAppBar(MainMenu.List, navController, Modifier.rotate(180F))
                             Row(
                                 modifier = Modifier
                                     .fillMaxSize()
@@ -88,7 +88,7 @@ fun Body() {
                 composable(MainMenu.Center.name) {
                     Box(modifier = Modifier.fillMaxSize()) {
                         Column(Modifier.rotate(180F)) {
-                            MyBottomAppBar(MainMenu.Center, navController, Modifier.rotate(180F))
+                            MainBottomAppBar(MainMenu.Center, navController, Modifier.rotate(180F))
                             Row(
                                 modifier = Modifier
                                     .fillMaxSize()
@@ -152,7 +152,7 @@ fun MyBorder(content: @Composable BoxScope.() -> Unit) {
  *
  */
 @Composable
-fun MessageBoard(model: MainViewModel= viewModel()) {
+fun MessageBoard(model: MarqueeViewModel = viewModel()) {
     MyBorder {
         Row(
             verticalAlignment = Alignment.CenterVertically
@@ -169,9 +169,11 @@ fun MessageBoard(model: MainViewModel= viewModel()) {
                 modifier = Modifier
                     .fillMaxWidth()
             ) {
-                Marquee(model = model) {
+                Marquee(model = model) { model, value ->
-                        model, value -> TestA(model = model,
+                    MarqueeText(
-                    offset = value)
+                        model = model,
+                        offset = value
+                    )
                 }
             }
 
@@ -208,52 +210,55 @@ fun ClubActivitiesTitle() {
  *
  */
 @Composable
-fun ClubActivitiesImage() {
+fun ClubActivitiesImage(model: CarouselViewModel = viewModel()) {
-    Column(modifier = Modifier.fillMaxSize()) {
+    Carousel(model = model) {
-        Card(
+        Column(modifier = Modifier.fillMaxSize()) {
-            modifier = Modifier
+            Card(
-                .weight(0.4F)
-                .fillMaxWidth()
-        ) {
-            Image(
-                painter = painterResource(id = R.drawable.hot_activity_desc_background),
-                contentDescription = null
-            )
-            Box(
                 modifier = Modifier
-                    .padding(horizontal = 85.dp, vertical = 30.dp)
+                    .weight(0.4F)
-                    .rotate(180F)
+                    .fillMaxWidth()
             ) {
-                Text(
+                Image(
-                    text = "文字对任何界面都属于核心内容，而利用 Jetpack Compose 可以更轻松地显示或写入文字。Compose 可以充分利用其构建块的组合，这意味着您无需覆盖各种属性和方法，也无需扩展大型类，即可拥有特定的可组合项设计以及按您期望的方式运行的逻辑。"
+                    painter = painterResource(id = R.drawable.hot_activity_desc_background),
-                        .repeat(10), overflow = TextOverflow.Ellipsis
+                    contentDescription = null
                 )
-            }
+                Box(
+                    modifier = Modifier
+                        .padding(horizontal = 85.dp, vertical = 30.dp)
+                        .rotate(180F)
+                ) {
+                    Text(
+                        text = "文字对任何界面都属于核心内容，而利用 Jetpack Compose 可以更轻松地显示或写入文字。Compose 可以充分利用其构建块的组合，这意味着您无需覆盖各种属性和方法，也无需扩展大型类，即可拥有特定的可组合项设计以及按您期望的方式运行的逻辑。"
+                            .repeat(10), overflow = TextOverflow.Ellipsis
+                    )
+                }
 
-        }
+            }
-        Card(
+            Card(
-            modifier = Modifier
+                modifier = Modifier
-                .weight(0.6F)
+                    .weight(0.6F)
-                .fillMaxWidth()
+                    .fillMaxWidth()
-        ) {
+                    .rotate(180F)
-            Image(
+            ) {
-                painter = painterResource(id = R.drawable.hot_activity_background),
+                Image(
-                contentDescription = null
+                    painter = painterResource(id = R.drawable.hot_activity_background),
-            )
+                    contentDescription = null
-            Image(
+                )
-                painter = painterResource(id = R.drawable.ic_launcher_foreground),
-                contentDescription = null
-            )
 
+                Image(
+                    painter = painterResource(id = it),
+                    contentDescription = null
+                )
+            }
         }
     }
 }
 
 
-@Preview(showBackground = true)
+//@Preview(showBackground = true)
 @Composable
 fun DefaultPreview() {
-    val model = MainViewModel()
+    val model = MarqueeViewModel()
     CSAMSTheme {
         Box(modifier = Modifier.fillMaxSize()) {
             Column {
@@ -268,62 +273,3 @@ fun DefaultPreview() {
 }
 
 
-
-
-@Composable
-fun TestA(model: MainViewModel= viewModel(),offset:State<Float>){
-    val poetryIndex: Int by model.poetryIndex.observeAsState(0)
-
-//        Text(text = "$poetryIndex")
-//        Text(text = "offset.value=${offset.value}")
-        Text(
-            text = model.poetry[poetryIndex % model.poetry.size],
-            modifier = Modifier.offset(x = offset.value.dp),
-            maxLines = 1,
-            overflow = TextOverflow.Ellipsis
-        )
-
-}
-
-/**
- * 轮播
- *
- */
-@Composable
-fun Carousel(){
-
-}
-
-/**
- * 跑马灯
- *
- * @param model
- * @param content
- */
-@Composable
-fun Marquee(model: MainViewModel= viewModel(),content: @Composable BoxScope.(model:MainViewModel,
-                                                                             value:State<Float>) -> Unit) {
-
-    val delayMillis=2000
-    Column {
-        BoxWithConstraints {
-            val transition = rememberInfiniteTransition()
-            val maxWidth = maxWidth + 30.dp
-            val offset = transition.animateFloat(
-                initialValue = 0F,
-                targetValue = maxWidth.value,
-                animationSpec = infiniteRepeatable(
-                    animation = tween(durationMillis = 3000,delayMillis = delayMillis),
-                    repeatMode = RepeatMode.Restart
-                )
-            )
-                Box(modifier = Modifier.fillMaxWidth()) {
-                    content(model=model,value=offset)
-                }
-
-                if (offset.value.toInt() == maxWidth.value.toInt()) {
-                    model.addAsync(delayMillis = delayMillis)
-                }
-        }
-    }
-}

app/src/main/java/com/gyf/csams/ui/model/MainViewModel.kt

@@ -1,33 +0,0 @@
-package com.gyf.csams.ui.model
-
-import androidx.lifecycle.LiveData
-import androidx.lifecycle.MutableLiveData
-import androidx.lifecycle.ViewModel
-import androidx.lifecycle.viewModelScope
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.launch
-
-
-class MainViewModel:ViewModel() {
-    val poetry= listOf("床前明月光","疑是地上霜","举头望明月","低头思故乡")
-
-    private val _poetryIndex=MutableLiveData(0)
-    var poetryIndex:LiveData<Int> = _poetryIndex
-    var job:Job? = null
-
-
-    fun addAsync(delayMillis:Int){
-        if(job == null || job?.isCompleted==true) {
-            job = viewModelScope.launch {
-                _poetryIndex.postValue(
-                    if (_poetryIndex.value == poetry.size-1) 0 else _poetryIndex.value?.plus(
-                        1
-                    )
-                )
-                delay(timeMillis = delayMillis.toLong())
-            }
-        }
-
-    }
-}

app/src/main/java/com/gyf/csams/ui/model/MarqueeViewModel.kt

@@ -0,0 +1,72 @@
+package com.gyf.csams.ui.model
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.gyf.csams.R
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+
+/**
+ * 跑马灯
+ *
+ */
+class MarqueeViewModel:ViewModel() {
+
+    val marqueeTexts= listOf("床前明月光","疑是地上霜","举头望明月","低头思故乡")
+
+    private val _marqueeIndex=MutableLiveData(0)
+    var marqueeIndex:LiveData<Int> = _marqueeIndex
+    var marqueeJob:Job? = null
+
+
+
+    fun addAsync(delayMillis:Int){
+        if(marqueeJob == null || marqueeJob?.isCompleted==true) {
+            marqueeJob = viewModelScope.launch {
+                _marqueeIndex.postValue(
+                    if (_marqueeIndex.value == marqueeTexts.size-1) 0 else _marqueeIndex.value?.plus(
+                        1
+                    )
+                )
+                delay(timeMillis = delayMillis.toLong())
+            }
+        }
+    }
+}
+
+class CarouselViewModel:ViewModel(){
+    val imageList= listOf(R.drawable.ic_launcher_foreground,R.drawable.ic_account_fill,R.drawable.ic_all_fill,R.drawable.ic_home_fill)
+
+    private val _index=MutableLiveData(0)
+
+    val index:LiveData<Int> = _index
+
+    var job:Job? = null
+
+    init {
+        start()
+    }
+
+    fun start(){
+        job = viewModelScope.launch {
+            do{
+                _index.postValue(if (_index.value==imageList.size-1) 0 else _index.value?.plus(1))
+                println("值更新为 ：$_index")
+                delay(5000)
+            }while (job?.isActive==true)
+        }
+    }
+
+    fun stop(){
+        println("停止更新")
+        job?.cancel()
+    }
+
+}
+
+class MainViewModel:ViewModel(){
+
+}