Merge pull request #2 from renanrhoden/fix-gradient-color-update-text

adding behavior to recalc gradiente when size changes

Author: joaortk

app/src/main/java/com/opencraft/android/gradienttextview/sample/MainActivity.kt

@@ -14,8 +14,10 @@ class MainActivity : AppCompatActivity() {
         val vm = MainViewModel(this)
         val binding = DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)
         binding.vm = vm
-//        binding.gradient.postDelayed({
-//            binding.gradient.gradientColors = intArrayOf(Color.BLUE, Color.GREEN)
-//        }, 1000)
+        binding.gradient.postDelayed({
+            vm.text.set("aaaaaa\naaaaaa\naaaaaaa\naaaaaaaa")
+        }, 1000)
+
+
     }
 }

app/src/main/java/com/opencraft/android/gradienttextview/sample/MainViewModel.kt

@@ -5,7 +5,7 @@ import android.databinding.ObservableField
 import com.opencraft.android.gradienttextview.R
 
 class MainViewModel(context: Context) {
-    val text = ObservableField<String>("aaaaaaaaaa\naaaaaaaaaa\naaaaaaaaaa\naaaaaaaaaa\naaaaaaaaaa")
+    val text = ObservableField<String>()
     val colors = context.resources.getIntArray(R.array.gradient_2)
     val colorsSpan = context.resources.getIntArray(R.array.gradient_color_span_2)
 }

library/src/main/java/com/opencraft/library/GradientTextView.kt

@@ -16,6 +16,7 @@ class GradientTextView constructor(context: Context, attrs: AttributeSet?, defSt
     private var startOption = -1
     private var endOption = -1
     private var changedColors = true
+    private var changedSize = false
 
     var gradientColors = intArrayOf(Color.BLACK, Color.WHITE)
         set(value) {
@@ -93,10 +94,14 @@ class GradientTextView constructor(context: Context, attrs: AttributeSet?, defSt
     }
 
     override fun onDraw(canvas: Canvas?) {
-        if (changedColors) {
+        if (changedColors ) {
             changedColors = false
             paint.shader = getLinearGradient()
         }
+        if (changedSize) {
+            changedSize = false
+            paint.shader = getLinearGradient()
+        }
         super.onDraw(canvas)
     }
 
@@ -151,6 +156,11 @@ class GradientTextView constructor(context: Context, attrs: AttributeSet?, defSt
         return Point(startX.toInt(), startY.toInt())
     }
 
+    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
+        super.onSizeChanged(w, h, oldw, oldh)
+        changedColors = true
+    }
+
     companion object {
         const val TOP_LEFT = 0
         const val TOP_CENTER = 1