adding some core widget related things

app/src/main/kotlin/com/simplemobiletools/clock/activities/WidgetDateTimeConfigureActivity.kt

@@ -0,0 +1,134 @@
+package com.simplemobiletools.clock.activities
+
+import android.app.Activity
+import android.appwidget.AppWidgetManager
+import android.content.Intent
+import android.graphics.Color
+import android.os.Bundle
+import android.widget.SeekBar
+import com.simplemobiletools.clock.R
+import com.simplemobiletools.clock.extensions.config
+import com.simplemobiletools.clock.helpers.MyWidgetDateTimeProvider
+import com.simplemobiletools.commons.dialogs.ColorPickerDialog
+import com.simplemobiletools.commons.extensions.adjustAlpha
+import kotlinx.android.synthetic.main.widget_config_date_time.*
+
+class WidgetDateTimeConfigureActivity : SimpleActivity() {
+    private var mBgAlpha = 0f
+    private var mWidgetId = 0
+    private var mBgColorWithoutTransparency = 0
+    private var mBgColor = 0
+    private var mTextColorWithoutTransparency = 0
+    private var mTextColor = 0
+
+    public override fun onCreate(savedInstanceState: Bundle?) {
+        useDynamicTheme = false
+        super.onCreate(savedInstanceState)
+        setResult(Activity.RESULT_CANCELED)
+        setContentView(R.layout.widget_config_date_time)
+        initVariables()
+
+        val extras = intent.extras
+        if (extras != null)
+            mWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID)
+
+        if (mWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID)
+            finish()
+
+        config_save.setOnClickListener { saveConfig() }
+        config_bg_color.setOnClickListener { pickBackgroundColor() }
+        config_text_color.setOnClickListener { pickTextColor() }
+
+        val primaryColor = config.primaryColor
+        config_bg_seekbar.setColors(mTextColor, primaryColor, primaryColor)
+    }
+
+    override fun onResume() {
+        super.onResume()
+        window.decorView.setBackgroundColor(0)
+    }
+
+    private fun initVariables() {
+        mTextColorWithoutTransparency = config.widgetTextColor
+        updateColors()
+
+        mBgColor = config.widgetBgColor
+        if (mBgColor == 1) {
+            mBgColor = Color.BLACK
+            mBgAlpha = .2f
+        } else {
+            mBgAlpha = Color.alpha(mBgColor) / 255.toFloat()
+        }
+
+        mBgColorWithoutTransparency = Color.rgb(Color.red(mBgColor), Color.green(mBgColor), Color.blue(mBgColor))
+        config_bg_seekbar.setOnSeekBarChangeListener(bgSeekbarChangeListener)
+        config_bg_seekbar.progress = (mBgAlpha * 100).toInt()
+        updateBgColor()
+    }
+
+    private fun saveConfig() {
+        storeWidgetColors()
+        requestWidgetUpdate()
+
+        Intent().apply {
+            putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mWidgetId)
+            setResult(Activity.RESULT_OK, this)
+        }
+        finish()
+    }
+
+    private fun storeWidgetColors() {
+        config.apply {
+            widgetBgColor = mBgColor
+            widgetTextColor = mTextColorWithoutTransparency
+        }
+    }
+
+    private fun pickBackgroundColor() {
+        ColorPickerDialog(this, mBgColorWithoutTransparency) {
+            mBgColorWithoutTransparency = it
+            updateBgColor()
+        }
+    }
+
+    private fun pickTextColor() {
+        ColorPickerDialog(this, mTextColor) {
+            mTextColorWithoutTransparency = it
+            updateColors()
+        }
+    }
+
+    private fun requestWidgetUpdate() {
+        Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE, null, this, MyWidgetDateTimeProvider::class.java).apply {
+            putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, intArrayOf(mWidgetId))
+            sendBroadcast(this)
+        }
+    }
+
+    private fun updateColors() {
+        mTextColor = mTextColorWithoutTransparency
+        config_text_color.setBackgroundColor(mTextColor)
+        config_save.setTextColor(mTextColor)
+    }
+
+    private fun updateBgColor() {
+        mBgColor = mBgColorWithoutTransparency.adjustAlpha(mBgAlpha)
+        config_bg_color.setBackgroundColor(mBgColor)
+        config_save.setBackgroundColor(mBgColor)
+    }
+
+    private val bgSeekbarChangeListener = object : SeekBar.OnSeekBarChangeListener {
+        override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
+            mBgAlpha = progress.toFloat() / 100.toFloat()
+            updateBgColor()
+        }
+
+        override fun onStartTrackingTouch(seekBar: SeekBar) {
+
+        }
+
+        override fun onStopTrackingTouch(seekBar: SeekBar) {
+
+        }
+    }
+}

app/src/main/kotlin/com/simplemobiletools/clock/helpers/MyWidgetDateTimeProvider.kt

@@ -0,0 +1,16 @@
+package com.simplemobiletools.clock.helpers
+
+import android.appwidget.AppWidgetManager
+import android.appwidget.AppWidgetProvider
+import android.content.Context
+
+class MyWidgetDateTimeProvider : AppWidgetProvider() {
+
+    override fun onUpdate(context: Context, appWidgetManager: AppWidgetManager, appWidgetIds: IntArray) {
+        performUpdate(context)
+    }
+
+    private fun performUpdate(context: Context) {
+
+    }
+}