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import java.lang.IllegalStateException

// Tutorial and inspiration from https://www.baeldung.com/kotlin/dsl

@DslMarker
annotation class SqlDslMarker

@SqlDslMarker
abstract class Condition {
    abstract fun addCondition(condition: Condition)

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• Composable UI
  • Organization
• Color
  • Color Antipatterns
• Typography
• Shapes
• Styles
• Theme

Composable UI

Composable UI is themed by default with a MaterialTheme object. It consists of three primary parts:

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package com.coxautoinc.vehiclekit.core

import android.content.Context
import android.graphics.drawable.Animatable
import android.graphics.drawable.Drawable
import android.support.annotation.DrawableRes
import android.support.graphics.drawable.Animatable2Compat
import android.support.graphics.drawable.AnimatedVectorDrawableCompat

/**

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<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportHeight="24.0"
    android:viewportWidth="24.0">

    <path
        android:name="long_leg"
        android:fillColor="#FFFFFFFF"
        android:pathData="M 20 11 L 5 11 L 5 13 L 20 13 Z" />

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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="mp_toolbar_style" format="reference" />
    <attr name="mp_header_style" format="reference" />
    <attr name="mp_select_color" format="reference" />
</resources>

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<resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="android:spinnerStyle">@style/AppTheme.Form.Spinner</item>
        <item name="android:spinnerItemStyle">@style/AppTheme.Form.Spinner.Item</item>
    </style>

    <!-- Spinner Styles -->
    <style name="AppTheme.Form.Spinner" parent="Widget.AppCompat.Spinner">
        <item name="android:paddingRight">0dp</item>

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import android.content.Context;
import android.graphics.Typeface;
import android.os.Build;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;

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/*
 * Copyright (C) 2014 Robert Szabo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software