Added some extensions (#4)

* Add a couple extra extensions.

* Add more extensions

* Make oneline fun

* Remove duplicated line from modules.xml

* Revert kprefsingle and fix minor docs

(cherry picked from commit 76d0de9)

* Clean up ColorUtils

* Clean up ActivityUtils

* Clean up DrawableUtils

* Remove MenuUtils

* Clean PackageUtils

* Clean up ViewUtils

* Clean up ViewUtils 2

10 files changed, 120 insertions, 41 deletions

diff --git a/core/README.md b/core/README.md
index 16ba5a0..42d82c5 100644
--- a/core/README.md
+++ b/core/README.md
@@ -165,7 +165,7 @@ Note that since KAU depends on [ANKO](https://github.com/Kotlin/anko), all of th
 ### ViewUtils
 
 > Extends View
-* `visible()`, `invisible()`, `gone()`, `isVisible()`, `isInvisible()`, `isGone()` methods
+* `visible()`, `invisible()`, `gone()`, `isVisible`, `isInvisible()`, `isGone()` methods
 * matchParent method to set the layout params to match_parent
 * Create snackbar directly
 * Set IIcon into ImageView directly
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt
index 74792e1..f742078 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefDelegate.kt
@@ -2,9 +2,6 @@ package ca.allanwang.kau.kpref
 
 import ca.allanwang.kau.kotlin.ILazyResettable
 
-/**
- * Created by Allan Wang on 2017-06-07.
- */
 object UNINITIALIZED
 
 fun KPref.kpref(key: String, fallback: Boolean, postSetter: (value: Boolean) -> Unit = {}) = KPrefDelegate(key, fallback, this, postSetter)
@@ -18,6 +15,8 @@ fun KPref.kpref(key: String, fallback: String, postSetter: (value: String) -> Un
 class StringSet(set: Collection<String>) : LinkedHashSet<String>(set)
 
 /**
+ * Created by Allan Wang on 2017-06-07.
+ *
  * Implementation of a kpref data item
  * Contains a unique key for the shared preference as well as a nonnull fallback item
  * Also contains an optional mutable postSetter that will be called every time a new value is given
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefSingleDelegate.kt b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefSingleDelegate.kt
index 6c0b608..af5c59b 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefSingleDelegate.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/kpref/KPrefSingleDelegate.kt
@@ -2,12 +2,11 @@ package ca.allanwang.kau.kpref
 
 import ca.allanwang.kau.kotlin.ILazyResettable
 
-/**
- * Created by Allan Wang on 2017-06-07.
- */
 fun KPref.kprefSingle(key: String) = KPrefSingleDelegate(key, this)
 
 /**
+ * Created by Allan Wang on 2017-06-07.
+ * 
  * Singular KPref Delegate for booleans
  * When the shared pref is not initialized, it will return true then set the pref to false
  * All subsequent retrievals will be false
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ActivityUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ActivityUtils.kt
index 4f95b2c..3b99c46 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/ActivityUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ActivityUtils.kt
@@ -1,12 +1,16 @@
 package ca.allanwang.kau.utils
 
+import android.annotation.SuppressLint
 import android.app.Activity
 import android.content.Intent
 import android.graphics.Color
+import android.os.Build
 import android.support.annotation.ColorInt
+import android.support.annotation.RequiresApi
 import android.support.annotation.StringRes
 import android.support.design.widget.Snackbar
 import android.view.Menu
+import android.view.View
 import ca.allanwang.kau.R
 import com.mikepenz.iconics.typeface.IIcon
 import org.jetbrains.anko.contentView
@@ -16,18 +20,17 @@ import org.jetbrains.anko.contentView
  */
 
 /**
- * Restarts an activity from itself without animations
+ * Restarts an activity from itself with a fade animation
  * Keeps its existing extra bundles and has a builder to accept other parameters
  */
 fun Activity.restart(builder: Intent.() -> Unit = {}) {
     val i = Intent(this, this::class.java)
-    i.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION)
     i.putExtras(intent.extras)
     i.builder()
     startActivity(i)
-    overridePendingTransition(0, 0) //No transitions
+    overridePendingTransition(R.anim.kau_fade_in, R.anim.kau_fade_out) //No transitions
     finish()
-    overridePendingTransition(0, 0)
+    overridePendingTransition(R.anim.kau_fade_in, R.anim.kau_fade_out)
 }
 
 fun Activity.finishSlideOut() {
@@ -47,6 +50,19 @@ var Activity.statusBarColor: Int
         if (buildIsLollipopAndUp) window.statusBarColor = value
     }
 
+var Activity.statusBarLight: Boolean
+    @SuppressLint("InlinedApi")
+    get() = if (buildIsMarshmallowAndUp) window.decorView.systemUiVisibility and View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR > 0 else false
+    @SuppressLint("InlinedApi")
+    set(value) {
+        if (buildIsMarshmallowAndUp) {
+            val flags = window.decorView.systemUiVisibility
+            window.decorView.systemUiVisibility =
+                    if (value) flags or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
+                    else flags and View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR.inv()
+        }
+    }
+
 /**
  * Themes the base menu icons and adds iicons programmatically based on ids
  *
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt
index 2704387..bbde077 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/AnimUtils.kt
@@ -13,7 +13,7 @@ import android.widget.TextView
 /**
  * Created by Allan Wang on 2017-06-01.
  *
- * Animation extension @KauUtils functions for Views
+ * Animation extension functions for Views
  */
 @KauUtils fun View.rootCircularReveal(x: Int = 0, y: Int = 0, duration: Long = 500L, onStart: (() -> Unit)? = null, onFinish: (() -> Unit)? = null) {
     this.addOnLayoutChangeListener(object : View.OnLayoutChangeListener {
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt
index 84a7c06..81bf0d9 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ColorUtils.kt
@@ -19,8 +19,11 @@ import com.afollestad.materialdialogs.R
 /**
  * Created by Allan Wang on 2017-06-08.
  */
-val Int.isColorDark: Boolean
-    get() = (0.299 * Color.red(this) + 0.587 * Color.green(this) + 0.114 * Color.blue(this)) / 255.0 < 0.5
+inline val Int.isColorDark: Boolean
+    get() = isColorDark(0.5f)
+
+fun Int.isColorDark(minDarkness: Float): Boolean =
+        ((0.299 * Color.red(this) + 0.587 * Color.green(this) + 0.114 * Color.blue(this)) / 255.0) < minDarkness
 
 fun Int.toHexString(withAlpha: Boolean = false, withHexPrefix: Boolean = true): String {
     val hex = if (withAlpha) String.format("#%08X", this)
@@ -66,6 +69,16 @@ val Int.isColorTransparent: Boolean
     get() = Color.alpha(this) != 255
 
 @ColorInt
+fun Int.blendWith(@ColorInt color: Int, @FloatRange(from = 0.0, to = 1.0) ratio: Float): Int {
+    val inverseRatio = 1f - ratio
+    val a = Color.alpha(this) * inverseRatio + Color.alpha(color) * ratio
+    val r = Color.red(this) * inverseRatio + Color.red(color) * ratio
+    val g = Color.green(this) * inverseRatio + Color.green(color) * ratio
+    val b = Color.blue(this) * inverseRatio + Color.blue(color) * ratio
+    return Color.argb(a.toInt(), r.toInt(), g.toInt(), b.toInt())
+}
+
+@ColorInt
 fun Int.withAlpha(@IntRange(from = 0L, to = 255L) alpha: Int): Int
         = Color.argb(alpha, Color.red(this), Color.green(this), Color.blue(this))
 
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt
index 944caa4..9fcc7e7 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/Const.kt
@@ -3,4 +3,9 @@ package ca.allanwang.kau.utils
 /**
  * Created by Allan Wang on 2017-06-08.
  */
-const val ANDROID_NAMESPACE = "http://schemas.android.com/apk/res/android"
\ No newline at end of file
+const val ANDROID_NAMESPACE = "http://schemas.android.com/apk/res/android"
+
+const val KAU_LEFT = 1
+const val KAU_TOP = 2
+const val KAU_RIGHT = 4
+const val KAU_BOTTOM = 8
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/DrawableUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/DrawableUtils.kt
new file mode 100644
index 0000000..dae3bff
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/DrawableUtils.kt
@@ -0,0 +1,20 @@
+package ca.allanwang.kau.utils
+
+import android.content.res.ColorStateList
+import android.graphics.drawable.Drawable
+import android.support.annotation.ColorInt
+import android.support.v4.graphics.drawable.DrawableCompat
+
+/**
+ * Wrap the color into a state and tint the drawable
+ */
+fun Drawable.tint(@ColorInt color: Int): Drawable = tint(ColorStateList.valueOf(color))
+
+/**
+ * Tint the drawable with a given color state list
+ */
+fun Drawable.tint(state: ColorStateList): Drawable {
+    val drawable = DrawableCompat.wrap(mutate())
+    DrawableCompat.setTintList(drawable, state)
+    return drawable
+}
\ No newline at end of file
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt
index 08e945c..d04538c 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/PackageUtils.kt
@@ -14,15 +14,12 @@ import android.os.Build
  * @return true if installed with activity, false otherwise
  */
 @KauUtils fun Context.isAppInstalled(packageName: String): Boolean {
-    val pm = packageManager
-    var installed: Boolean
     try {
-        pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES)
-        installed = true
+        packageManager.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES)
+        return true
     } catch (e: PackageManager.NameNotFoundException) {
-        installed = false
+        return false
     }
-    return installed
 }
 
 val buildIsLollipopAndUp: Boolean
diff --git a/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt b/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt
index 48a048b..53d6d05 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/utils/ViewUtils.kt
@@ -2,25 +2,26 @@ package ca.allanwang.kau.utils
 
 import android.content.Context
 import android.graphics.Color
-import android.graphics.Outline
 import android.graphics.Rect
 import android.support.annotation.ColorInt
 import android.support.annotation.StringRes
 import android.support.annotation.TransitionRes
+import android.support.design.widget.FloatingActionButton
 import android.support.design.widget.Snackbar
+import android.support.design.widget.TextInputEditText
 import android.support.transition.AutoTransition
 import android.support.transition.Transition
 import android.support.transition.TransitionInflater
 import android.support.transition.TransitionManager
 import android.support.v7.widget.LinearLayoutManager
 import android.support.v7.widget.RecyclerView
+import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.view.ViewOutlineProvider
 import android.view.inputmethod.InputMethodManager
+import android.widget.EditText
 import android.widget.ImageView
 import android.widget.TextView
-import ca.allanwang.kau.logging.KL
 import ca.allanwang.kau.ui.createSimpleRippleDrawable
 import com.mikepenz.iconics.IconicsDrawable
 import com.mikepenz.iconics.typeface.IIcon
@@ -29,24 +30,33 @@ import com.mikepenz.iconics.typeface.IIcon
 /**
  * Created by Allan Wang on 2017-05-31.
  */
-@KauUtils fun <T : View> T.visible(): T {
+
+@KauUtils inline fun <T : View> T.visible(): T {
     visibility = View.VISIBLE
     return this
 }
 
-@KauUtils fun <T : View> T.invisible(): T {
+@KauUtils inline fun <T : View> T.invisible(): T {
     visibility = View.INVISIBLE
     return this
 }
 
-@KauUtils fun <T : View> T.gone(): T {
+@KauUtils inline fun <T : View> T.gone(): T {
     visibility = View.GONE
     return this
 }
 
-@KauUtils fun View.isVisible(): Boolean = visibility == View.VISIBLE
-@KauUtils fun View.isInvisible(): Boolean = visibility == View.INVISIBLE
-@KauUtils fun View.isGone(): Boolean = visibility == View.GONE
+@KauUtils inline fun <T : View> T.invisibleIf(invisible: Boolean): T = if (invisible) invisible() else visible()
+
+@KauUtils inline fun <T : View> T.visibleIf(visible: Boolean): T = if (visible) visible() else gone()
+
+@KauUtils inline fun <T : View> T.goneIf(gone: Boolean): T = visibleIf(!gone)
+
+@KauUtils inline val View.isVisible: Boolean get() = visibility == View.VISIBLE
+
+@KauUtils inline val View.isInvisible: Boolean get() = visibility == View.INVISIBLE
+
+@KauUtils inline val View.isGone: Boolean get() = visibility == View.GONE
 
 fun View.snackbar(text: String, duration: Int = Snackbar.LENGTH_LONG, builder: Snackbar.() -> Unit = {}): Snackbar {
     val snackbar = Snackbar.make(this, text, duration)
@@ -67,6 +77,33 @@ fun View.snackbar(@StringRes textId: Int, duration: Int = Snackbar.LENGTH_LONG,
     setImageDrawable(icon.toDrawable(context, sizeDp = sizeDp, color = color, builder = builder))
 }
 
+@KauUtils inline val FloatingActionButton.isHidden get() = !isShown
+
+fun FloatingActionButton.showIf(show: Boolean) = if (show) show() else hide()
+
+fun FloatingActionButton.hideIf(hide: Boolean) = if (hide) hide() else show()
+
+@KauUtils fun ViewGroup.inflate(layoutId: Int, attachToRoot: Boolean = false): View = LayoutInflater.from(context).inflate(layoutId, this, attachToRoot)
+
+@KauUtils fun View.updateLeftMargin(margin: Int) = updateMargins(margin, KAU_LEFT)
+
+@KauUtils fun View.updateTopMargin(margin: Int) = updateMargins(margin, KAU_TOP)
+
+@KauUtils fun View.updateRightMargin(margin: Int) = updateMargins(margin, KAU_RIGHT)
+
+@KauUtils fun View.updateBottomMargin(margin: Int) = updateMargins(margin, KAU_BOTTOM)
+
+@KauUtils private fun View.updateMargins(margin: Int, flag: Int) {
+    val p = (layoutParams as? ViewGroup.MarginLayoutParams) ?: return
+    p.setMargins(
+            if (flag == KAU_LEFT) margin else p.leftMargin,
+            if (flag == KAU_TOP) margin else p.topMargin,
+            if (flag == KAU_RIGHT) margin else p.rightMargin,
+            if (flag == KAU_BOTTOM) margin else p.bottomMargin
+    )
+    requestLayout()
+}
+
 @KauUtils fun View.hideKeyboard() {
     clearFocus()
     (context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager).hideSoftInputFromWindow(windowToken, 0)
@@ -93,8 +130,7 @@ fun View.snackbar(@StringRes textId: Int, duration: Int = Snackbar.LENGTH_LONG,
     background = createSimpleRippleDrawable(foregroundColor, backgroundColor)
 }
 
-@KauUtils val View.parentViewGroup: ViewGroup
-    get() = parent as ViewGroup
+@KauUtils val View.parentViewGroup: ViewGroup get() = parent as ViewGroup
 
 @KauUtils val View.parentVisibleHeight: Int
     get() {
@@ -103,15 +139,9 @@ fun View.snackbar(@StringRes textId: Int, duration: Int = Snackbar.LENGTH_LONG,
         return r.height()
     }
 
-val CIRCULAR_OUTLINE: ViewOutlineProvider = object : ViewOutlineProvider() {
-    override fun getOutline(view: View, outline: Outline) {
-        KL.d("CIRCULAR OUTLINE")
-        outline.setOval(view.paddingLeft,
-                view.paddingTop,
-                view.width - view.paddingRight,
-                view.height - view.paddingBottom)
-    }
-}
+val EditText.value: String get() = text.toString().trim()
+
+val TextInputEditText.value: String get() = text.toString().trim()
 
 /**
  * Generates a recycler view with match parent and a linearlayoutmanager, since it's so commonly used