Create logic for backContainer

Semper-Viventem · Feb 10, 2019 · a4228e5 · a4228e5
1 parent 3da95e6
commit a4228e5
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Showing 3 changed files with 61 additions and 19 deletions.
diff --git a/backdrop/build.gradle b/backdrop/build.gradle
@@ -65,6 +65,7 @@ dependencies {
 
     // Android X
     implementation "androidx.appcompat:appcompat:1.1.0-alpha02"
+    implementation "com.google.android.material:material:1.1.0-alpha03"
 
     // Kotlin
     implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

diff --git a/backdrop/src/main/kotlin/ru/semper_viventem/backdrop/BackdropBehavior.kt b/backdrop/src/main/kotlin/ru/semper_viventem/backdrop/BackdropBehavior.kt
@@ -5,9 +5,11 @@ import android.os.Bundle
 import android.os.Parcelable
 import android.util.AttributeSet
 import android.view.View
+import android.view.ViewGroup
 import androidx.annotation.IdRes
 import androidx.appcompat.widget.Toolbar
 import androidx.coordinatorlayout.widget.CoordinatorLayout
+import com.google.android.material.appbar.AppBarLayout
 
 
 class BackdropBehavior : CoordinatorLayout.Behavior<View> {
@@ -30,12 +32,14 @@ class BackdropBehavior : CoordinatorLayout.Behavior<View> {
         private const val ARG_DROP_STATE = "arg_drop_state"
     }
 
+    private var utils = BackdropUtils()
+
     private var toolbarId: Int? = null
-    private var backContainerId: Int? = null
+    private var backLayoutId: Int? = null
 
-    private var child: View? = null
     private var toolbar: Toolbar? = null
-    private var backContainer: View? = null
+    private var backLayout: ViewGroup? = null
+    private var frontLayout: View? = null
 
     private var closedIconId: Int = R.drawable.ic_menu
     private var openedIconRes: Int = R.drawable.ic_close
@@ -61,25 +65,32 @@ class BackdropBehavior : CoordinatorLayout.Behavior<View> {
     }
 
     override fun layoutDependsOn(parent: CoordinatorLayout, child: View, dependency: View): Boolean {
-        if (toolbarId == null || backContainerId == null) return false
+        if (toolbarId == null || backLayoutId == null) return false
 
         return when (dependency.id) {
             toolbarId -> true
-            backContainerId -> true
+            backLayoutId -> true
             else -> false
         }
     }
 
     override fun onDependentViewChanged(parent: CoordinatorLayout, child: View, dependency: View): Boolean {
 
-        this.child = child
+        this.frontLayout = child as? ViewGroup ?: throw IllegalArgumentException("BackLayout must extend a ViewGroup")
         when (dependency.id) {
-            toolbarId -> toolbar = dependency as Toolbar
-            backContainerId -> backContainer = dependency
+            toolbarId -> toolbar = dependency as? Toolbar
+                    ?: throw IllegalArgumentException("toolbarId doesn't match Toolbar")
+
+            backLayoutId -> {
+                backLayout = dependency as? AppBarLayout
+                        ?: throw IllegalArgumentException("appBarLayoutId doesn't match AppBarLayout")
+                toolbar = utils.findToolbar(backLayout!!)
+                        ?: throw IllegalArgumentException("AppBarLayout mast contain a Toolbar!")
+            }
         }
 
-        if (toolbar != null && backContainer != null) {
-            initViews(parent, child, toolbar!!, backContainer!!)
+        if (toolbar != null && frontLayout != null) {
+            initViews(parent, backLayout!!, toolbar!!, frontLayout!!)
         }
 
         return super.onDependentViewChanged(parent, child, dependency)
@@ -97,8 +108,20 @@ class BackdropBehavior : CoordinatorLayout.Behavior<View> {
         this.toolbarId = toolbarId
     }
 
+    /**
+     * Attach back layout to Backdrop.
+     * BackDropLayout must contain a [Toolbar]
+     */
+    fun attachBackLayout(@IdRes appBarLayoutId: Int) {
+        this.backLayoutId = appBarLayoutId
+    }
+
+    /**
+     * @@deprecated — use [BackdropBehavior.attachBackLayout]
+     */
+    @Deprecated("Use BackdropBehavior.attachBackLayout")
     fun attachBackContainer(@IdRes backContainerId: Int) {
-        this.backContainerId = backContainerId
+        this.backLayoutId = backContainerId
     }
 
     fun addOnDropListener(listener: OnDropListener) {
@@ -113,8 +136,8 @@ class BackdropBehavior : CoordinatorLayout.Behavior<View> {
         false
     } else {
         dropState = DropState.OPEN
-        if (child != null && toolbar != null && backContainer != null) {
-            drawDropState(child!!, toolbar!!, backContainer!!, withAnimation)
+        if (backLayout != null && toolbar != null && frontLayout != null) {
+            drawDropState(backLayout!!, toolbar!!, frontLayout!!, withAnimation)
         } else {
             throw IllegalArgumentException("Toolbar and backContainer must be initialized")
         }
@@ -126,27 +149,27 @@ class BackdropBehavior : CoordinatorLayout.Behavior<View> {
         false
     } else {
         dropState = DropState.CLOSE
-        if (child != null && toolbar != null && backContainer != null) {
-            drawDropState(child!!, toolbar!!, backContainer!!, withAnimation)
+        if (backLayout != null && toolbar != null && frontLayout != null) {
+            drawDropState(backLayout!!, toolbar!!, frontLayout!!, withAnimation)
         } else {
             throw IllegalArgumentException("Toolbar and backContainer must be initialized")
         }
         notifyListeners(false)
         true
     }
 
-    private fun initViews(parent: CoordinatorLayout, child: View, toolbar: Toolbar, backContainer: View) {
+    private fun initViews(parent: CoordinatorLayout, backDropLayout: View, toolbar: Toolbar, backContainer: View) {
         backContainer.y = toolbar.y + toolbar.height
-        child.layoutParams.height = parent.height - toolbar.height
-        drawDropState(child, toolbar, backContainer, false)
+        backDropLayout.layoutParams.height = parent.height - toolbar.height
+        drawDropState(backDropLayout, toolbar, backContainer, false)
 
         with(toolbar) {
             setNavigationOnClickListener {
                 dropState = when (dropState) {
                     DropState.CLOSE -> DropState.OPEN
                     DropState.OPEN -> DropState.CLOSE
                 }
-                drawDropState(child, toolbar, backContainer)
+                drawDropState(backDropLayout, toolbar, backContainer)
                 notifyListeners(true)
             }
         }

diff --git a/backdrop/src/main/kotlin/ru/semper_viventem/backdrop/BackdropUtils.kt b/backdrop/src/main/kotlin/ru/semper_viventem/backdrop/BackdropUtils.kt
@@ -0,0 +1,18 @@
+package ru.semper_viventem.backdrop
+
+import android.view.ViewGroup
+import androidx.appcompat.widget.Toolbar
+
+class BackdropUtils {
+
+    fun findToolbar(viewGroup: ViewGroup): Toolbar? {
+        for (chileId in 0..viewGroup.childCount) {
+            val childView = viewGroup.getChildAt(chileId)
+            if (childView is Toolbar) {
+                return childView
+            }
+        }
+
+        return null
+    }
+}