回调一屏显示几个

dyguests · Jun 29, 2018 · cc589a1 · cc589a1
1 parent 31556fd
commit cc589a1
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diff --git a/library/src/main/java/com/fanhl/flamebarchart/TravelChart.kt b/library/src/main/java/com/fanhl/flamebarchart/TravelChart.kt
@@ -190,6 +190,10 @@ class TravelChart @JvmOverloads constructor(
      */
     private var resetAnimator: ValueAnimator? = null
 
+    /** 在屏幕中最多可以同时显示多少条柱 */
+    var maxVisibleCount: Int = -1
+        private set
+
     init {
         val configuration = ViewConfiguration.get(context)
         mTouchSlop = configuration.scaledTouchSlop
@@ -570,6 +574,8 @@ class TravelChart @JvmOverloads constructor(
         val validWidth = width - paddingLeft - paddingRight
         val validHeight = height - paddingTop - paddingBottom
 
+        maxVisibleCount = (validWidth + barInterval) / (barWidth + barInterval)
+
         val saveCount = canvas.save()
         canvas.translate(paddingLeft.toFloat(), paddingRight.toFloat())
 

diff --git a/sample/src/main/java/com/fanhl/flamebarchart/sample/MainActivity.kt b/sample/src/main/java/com/fanhl/flamebarchart/sample/MainActivity.kt
@@ -41,6 +41,7 @@ class MainActivity : AppCompatActivity() {
         chart_travel.data = TravelChart.DefaultData<Item>().apply {
             (1..20).forEach { list.add(Item(it, random.nextFloat().takeIf { it > 0.2f })) }
         }
+        tv_max_visible_count.text = "在屏幕中最多可以同时显示多少条柱：\n${chart_travel.maxVisibleCount}"
     }
 
     companion object {

diff --git a/sample/src/main/res/layout/activity_main.xml b/sample/src/main/res/layout/activity_main.xml
@@ -49,4 +49,18 @@
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:srcCompat="@mipmap/ic_launcher_round"/>
+
+    <TextView
+        android:id="@+id/tv_max_visible_count"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="8dp"
+        android:layout_marginLeft="8dp"
+        android:layout_marginRight="8dp"
+        android:layout_marginStart="8dp"
+        android:layout_marginTop="8dp"
+        android:text="TextView"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/view_1"/>
 </android.support.constraint.ConstraintLayout>