FontAssetEditor.cs

// Unity C# reference source
// Copyright (c) Unity Technologies. For terms of use, see
// https://unity3d.com/legal/licenses/Unity_Reference_Only_License

using System;
using UnityEngine;
using UnityEditorInternal;
using System.Collections.Generic;
using UnityEngine.TextCore.Text;
using UnityEngine.TextCore.LowLevel;
using UnityEditor.TextCore.LowLevel;

using Glyph = UnityEngine.TextCore.Glyph;
using GlyphRect = UnityEngine.TextCore.GlyphRect;
using GlyphMetrics = UnityEngine.TextCore.GlyphMetrics;

#pragma warning disable CS0618 // Font feature tables and OTL feature tags; TextCoreShaderGUI, TextCoreShaderGUISDF, TextCoreShaderGUIBitmap, TextShaderUtilities are obsolete; handled natively by ATG

namespace UnityEditor.TextCore.Text
{
    [CustomPropertyDrawer(typeof(FontWeightPair))]
    internal class FontWeightDrawer : PropertyDrawer
    {
        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
        {
            SerializedProperty prop_regular = property.FindPropertyRelative("regularTypeface");
            SerializedProperty prop_italic = property.FindPropertyRelative("italicTypeface");

            float width = position.width;

            position.width = EditorGUIUtility.labelWidth;
            EditorGUI.LabelField(position, label);

            int oldIndent = EditorGUI.indentLevel;
            EditorGUI.indentLevel = 0;

            // NORMAL TYPEFACE
            if (label.text[0] == '4') GUI.enabled = false;
            position.x += position.width; position.width = (width - position.width) / 2;
            EditorGUI.PropertyField(position, prop_regular, GUIContent.none);

            // ITALIC TYPEFACE
            GUI.enabled = true;
            position.x += position.width;
            EditorGUI.PropertyField(position, prop_italic, GUIContent.none);

            EditorGUI.indentLevel = oldIndent;
        }
    }

    [CustomEditor(typeof(FontAsset))]
    internal class FontAssetEditor : Editor
    {
        internal struct UI_PanelState
        {
            public static bool generationSettingsPanel = true;
            public static bool fontAtlasInfoPanel = true;
            public static bool fontWeightPanel = true;
            public static bool fallbackFontAssetPanel = true;
            public static bool glyphTablePanel = false;
            public static bool characterTablePanel = false;
            public static bool LigatureSubstitutionTablePanel;
            public static bool PairAdjustmentTablePanel = false;
            public static bool MarkToBaseTablePanel = false;
            public static bool MarkToMarkTablePanel = false;
        }

        internal struct GenerationSettings
        {
            public Font sourceFont;
            public int faceIndex;
            public GlyphRenderMode glyphRenderMode;
            public float pointSize;
            public int padding;
            public int atlasWidth;
            public int atlasHeight;
        }

        /// <summary>
        /// Material used to display SDF glyphs in the Character and Glyph tables.
        /// </summary>
        internal static Material internalSDFMaterial
        {
            get
            {
                if (s_InternalSDFMaterial == null)
                {
                    Shader shader = TextShaderUtilities.ShaderRef_MobileSDF;

                    if (shader != null)
                        s_InternalSDFMaterial = new Material(shader);
                }

                return s_InternalSDFMaterial;
            }
        }
        static Material s_InternalSDFMaterial;

        /// <summary>
        /// Material used to display Bitmap glyphs in the Character and Glyph tables.
        /// </summary>
        internal static Material internalBitmapMaterial
        {
            get
            {
                if (s_InternalBitmapMaterial == null)
                {
                    Shader shader = Shader.Find("Hidden/Internal-GUITextureClipText");

                    if (shader != null)
                        s_InternalBitmapMaterial = new Material(shader);
                }

                return s_InternalBitmapMaterial;
            }
        }
        static Material s_InternalBitmapMaterial;

        /// <summary>
        /// Material used to display color glyphs in the Character and Glyph tables.
        /// </summary>
        internal static Material internalRGBABitmapMaterial
        {
            get
            {
                if (s_Internal_Bitmap_RGBA_Material == null)
                {
                    Shader shader = Shader.Find("Hidden/Internal-GUITextureClip");

                    if (shader != null)
                        s_Internal_Bitmap_RGBA_Material = new Material(shader);
                }

                return s_Internal_Bitmap_RGBA_Material;
            }
        }
        static Material s_Internal_Bitmap_RGBA_Material;



        private static string[] s_UiStateLabel = new string[] { "<i>(Click to collapse)</i> ", "<i>(Click to expand)</i> " };
        public static readonly GUIContent getFontFeaturesLabel = new GUIContent("Get Font Features", "Determines if OpenType font features should be retrieved from the source font file as new characters and glyphs are added to the font asset.");
        private GUIContent[] m_AtlasResolutionLabels = { new GUIContent("8"), new GUIContent("16"), new GUIContent("32"), new GUIContent("64"), new GUIContent("128"), new GUIContent("256"), new GUIContent("512"), new GUIContent("1024"), new GUIContent("2048"), new GUIContent("4096"), new GUIContent("8192") };
        private int[] m_AtlasResolutions = { 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192 };

        private struct Warning
        {
            public bool isEnabled;
            public double expirationTime;
        }

        private int m_CurrentGlyphPage = 0;
        private int m_CurrentCharacterPage = 0;
        private int m_CurrentLigaturePage = 0;
        private int m_CurrentAdjustmentPairPage = 0;
        private int m_CurrentMarkToBasePage = 0;
        private int m_CurrentMarkToMarkPage = 0;

        internal int m_SelectedGlyphRecord = -1;
        internal int m_SelectedCharacterRecord = -1;
        internal int m_SelectedLigatureRecord = -1;
        internal int m_SelectedAdjustmentRecord = -1;
        internal int m_SelectedMarkToBaseRecord = -1;
        internal int m_SelectedMarkToMarkRecord = -1;

        enum RecordSelectionType { CharacterRecord, GlyphRecord, LigatureSubstitutionRecord, AdjustmentPairRecord, MarkToBaseRecord, MarkToMarkRecord }

        private string m_dstGlyphID;
        private string m_dstUnicode;
        private const string k_placeholderUnicodeHex = "<i>New Unicode (Hex)</i>";
        private string m_unicodeHexLabel = k_placeholderUnicodeHex;
        private const string k_placeholderGlyphID = "<i>New Glyph ID</i>";
        private string m_GlyphIDLabel = k_placeholderGlyphID;

        private Warning m_AddGlyphWarning;
        private Warning m_AddCharacterWarning;
        private bool m_DisplayDestructiveChangeWarning;
        private GenerationSettings m_GenerationSettings;
        private bool m_MaterialPresetsRequireUpdate;

        private static readonly string[] k_InvalidFontFaces = { string.Empty };
        private string[] m_FontFaces;
        private bool m_FaceInfoDirty;

        private string m_GlyphSearchPattern;
        private List<int> m_GlyphSearchList;

        private string m_LigatureTableSearchPattern;
        private List<int> m_LigatureTableSearchList;

        private string m_CharacterSearchPattern;
        private List<int> m_CharacterSearchList;

        private string m_KerningTableSearchPattern;
        private List<int> m_KerningTableSearchList;

        private string m_MarkToBaseTableSearchPattern;
        private List<int> m_MarkToBaseTableSearchList;

        private string m_MarkToMarkTableSearchPattern;
        private List<int> m_MarkToMarkTableSearchList;

        private HashSet<uint> m_GlyphsToAdd;

        private bool m_isSearchDirty;

        private const string k_UndoRedo = "UndoRedoPerformed";

        private SerializedProperty m_AtlasPopulationMode_prop;
        private SerializedProperty font_atlas_prop;
        private SerializedProperty font_material_prop;

        private SerializedProperty m_FontFaceIndex_prop;
        private SerializedProperty m_AtlasRenderMode_prop;
        private SerializedProperty m_SamplingPointSize_prop;
        private SerializedProperty m_AtlasPadding_prop;
        private SerializedProperty m_AtlasWidth_prop;
        private SerializedProperty m_AtlasHeight_prop;
        private SerializedProperty m_IsMultiAtlasTexturesEnabled_prop;
        private SerializedProperty m_ClearDynamicDataOnBuild_prop;
        private SerializedProperty m_GetFontFeatures_prop;

        private SerializedProperty fontWeights_prop;

        //private SerializedProperty fallbackFontAssets_prop;
        private ReorderableList m_FallbackFontAssetList;

        private SerializedProperty font_normalStyle_prop;
        private SerializedProperty font_normalSpacing_prop;

        private SerializedProperty font_boldStyle_prop;
        private SerializedProperty font_boldSpacing_prop;

        private SerializedProperty font_italicStyle_prop;
        private SerializedProperty font_tabSize_prop;

        private SerializedProperty m_FaceInfo_prop;
        private SerializedProperty m_GlyphTable_prop;
        private SerializedProperty m_CharacterTable_prop;

        private FontFeatureTable m_FontFeatureTable;
        private SerializedProperty m_FontFeatureTable_prop;
        private SerializedProperty m_GlyphPairAdjustmentRecords_prop;
        private SerializedProperty m_LigatureSubstitutionRecords_prop;
        private SerializedProperty m_MarkToBaseAdjustmentRecords_prop;
        private SerializedProperty m_MarkToMarkAdjustmentRecords_prop;

        private SerializedProperty m_ShowObsoleteProperties_prop;

        private SerializedPropertyHolder m_SerializedPropertyHolder;
        private SerializedProperty m_EmptyGlyphPairAdjustmentRecord_prop;
        private SerializedProperty m_FirstCharacterUnicode_prop;
        private SerializedProperty m_SecondCharacterUnicode_prop;


        // private string m_SecondCharacter;
        // private uint m_SecondGlyphIndex;

        private FontAsset m_fontAsset;

        private Material[] m_materialPresets;

        private bool isAssetDirty = false;
        private bool m_IsFallbackGlyphCacheDirty;

        private int errorCode;

        private System.DateTime timeStamp;

        public void OnEnable()
        {
            m_FaceInfo_prop = serializedObject.FindProperty("m_FaceInfo");

            font_atlas_prop = serializedObject.FindProperty("m_AtlasTextures").GetArrayElementAtIndex(0);
            font_material_prop = serializedObject.FindProperty("m_Material");

            m_FontFaceIndex_prop = m_FaceInfo_prop.FindPropertyRelative("m_FaceIndex");
            m_AtlasPopulationMode_prop = serializedObject.FindProperty("m_AtlasPopulationMode");
            m_AtlasRenderMode_prop = serializedObject.FindProperty("m_AtlasRenderMode");
            m_SamplingPointSize_prop = m_FaceInfo_prop.FindPropertyRelative("m_PointSize");
            m_AtlasPadding_prop = serializedObject.FindProperty("m_AtlasPadding");
            m_AtlasWidth_prop = serializedObject.FindProperty("m_AtlasWidth");
            m_AtlasHeight_prop = serializedObject.FindProperty("m_AtlasHeight");
            m_IsMultiAtlasTexturesEnabled_prop = serializedObject.FindProperty("m_IsMultiAtlasTexturesEnabled");
            m_ClearDynamicDataOnBuild_prop = serializedObject.FindProperty("m_ClearDynamicDataOnBuild");
            m_GetFontFeatures_prop = serializedObject.FindProperty("m_GetFontFeatures");
            m_ShowObsoleteProperties_prop = serializedObject.FindProperty("m_ShowObsoleteProperties");

            fontWeights_prop = serializedObject.FindProperty("m_FontWeightTable");

            m_FallbackFontAssetList = PrepareReorderableList(serializedObject.FindProperty("m_FallbackFontAssetTable"), "Fallback Font Assets");

            // Clean up fallback list in the event if contains null elements.
            CleanFallbackFontAssetTable();

            font_normalStyle_prop = serializedObject.FindProperty("m_RegularStyleWeight");
            font_normalSpacing_prop = serializedObject.FindProperty("m_RegularStyleSpacing");

            font_boldStyle_prop = serializedObject.FindProperty("m_BoldStyleWeight");
            font_boldSpacing_prop = serializedObject.FindProperty("m_BoldStyleSpacing");

            font_italicStyle_prop = serializedObject.FindProperty("m_ItalicStyleSlant");
            font_tabSize_prop = serializedObject.FindProperty("m_TabMultiple");

            m_CharacterTable_prop = serializedObject.FindProperty("m_CharacterTable");
            m_GlyphTable_prop = serializedObject.FindProperty("m_GlyphTable");

            m_FontFeatureTable_prop = serializedObject.FindProperty("m_FontFeatureTable");
            m_LigatureSubstitutionRecords_prop = m_FontFeatureTable_prop.FindPropertyRelative("m_LigatureSubstitutionRecords");
            m_GlyphPairAdjustmentRecords_prop = m_FontFeatureTable_prop.FindPropertyRelative("m_GlyphPairAdjustmentRecords");
            m_MarkToBaseAdjustmentRecords_prop = m_FontFeatureTable_prop.FindPropertyRelative("m_MarkToBaseAdjustmentRecords");
            m_MarkToMarkAdjustmentRecords_prop = m_FontFeatureTable_prop.FindPropertyRelative("m_MarkToMarkAdjustmentRecords");

            m_fontAsset = target as FontAsset;
            m_FontFeatureTable = m_fontAsset.fontFeatureTable;

            // Get Font Faces and Styles
            m_FontFaces = GetFontFaces();

            // Create serialized object to allow us to use a serialized property of an empty kerning pair.
            m_SerializedPropertyHolder = CreateInstance<SerializedPropertyHolder>();
            m_SerializedPropertyHolder.fontAsset = m_fontAsset;
            SerializedObject internalSerializedObject = new SerializedObject(m_SerializedPropertyHolder);
            m_FirstCharacterUnicode_prop = internalSerializedObject.FindProperty("firstCharacter");
            m_SecondCharacterUnicode_prop = internalSerializedObject.FindProperty("secondCharacter");
            m_EmptyGlyphPairAdjustmentRecord_prop = internalSerializedObject.FindProperty("glyphPairAdjustmentRecord");

            m_materialPresets = TextCoreEditorUtilities.FindMaterialReferences(m_fontAsset);

            m_GlyphSearchList = new List<int>();
            m_KerningTableSearchList = new List<int>();

            // Sort Font Asset Tables
            m_fontAsset.SortAllTables();

            // Clear glyph proxy lookups
            TextCorePropertyDrawerUtilities.ClearGlyphProxyLookups();
        }

        private ReorderableList PrepareReorderableList(SerializedProperty property, string label)
        {
            SerializedObject so = property.serializedObject;

            ReorderableList list = new ReorderableList(so, property, true, true, true, true);

            list.drawHeaderCallback = rect =>
            {
                EditorGUI.LabelField(rect, label);
            };

            list.drawElementCallback = (rect, index, isActive, isFocused) =>
            {
                var element = list.serializedProperty.GetArrayElementAtIndex(index);
                rect.y += 2;
                EditorGUI.PropertyField(new Rect(rect.x, rect.y, rect.width, EditorGUIUtility.singleLineHeight), element, GUIContent.none);
            };

            list.onChangedCallback = itemList => { };

            return list;
        }


        public void OnDisable()
        {
            // Revert changes if user closes or changes selection without having made a choice.
            if (m_DisplayDestructiveChangeWarning)
            {
                m_DisplayDestructiveChangeWarning = false;
                RestoreGenerationSettings();
                GUIUtility.keyboardControl = 0;

                serializedObject.ApplyModifiedProperties();
            }
        }

        public override void OnInspectorGUI()
        {
            Event currentEvent = Event.current;

            serializedObject.Update();

            if (m_ShowObsoleteProperties_prop.boolValue)
            {
                EditorGUILayout.HelpBox(
                    "These properties are only available in TextCore and will be removed in a future version. " +
                    "It is highly recommended to upgrade to ATG (Advanced Text Generator) and disable this option.",
                    MessageType.Warning, true);
            }

            EditorGUILayout.Space();

            Rect rect = EditorGUILayout.GetControlRect(false, 24);
            float labelWidth = EditorGUIUtility.labelWidth;
            float fieldWidth = EditorGUIUtility.fieldWidth;

            // FACE INFO PANEL
            #region Face info
            GUI.Label(rect, new GUIContent("<b>Face Info</b> - v" + m_fontAsset.version), TM_EditorStyles.sectionHeader);

            // Show/Hide Obsolete Properties button
            string obsoleteButtonText = m_ShowObsoleteProperties_prop.boolValue ? "Hide Obsolete Properties" : "Show Obsolete Properties";
            Rect obsoleteButtonRect = new Rect(rect.x + rect.width - 300f, rect.y + 2, 160f, 18f);
            if (GUI.Button(obsoleteButtonRect, new GUIContent(obsoleteButtonText)))
            {
                m_ShowObsoleteProperties_prop.boolValue = !m_ShowObsoleteProperties_prop.boolValue;
                serializedObject.ApplyModifiedProperties();
            }

            rect.x += rect.width - 132f;
            rect.y += 2;
            rect.width = 130f;
            rect.height = 18f;
            if (GUI.Button(rect, new GUIContent("Update Atlas Texture")))
            {
                FontAssetCreatorWindow.ShowFontAtlasCreatorWindow(target as FontAsset);
            }

            EditorGUI.indentLevel = 1;
            GUI.enabled = false; // Lock UI

            // TODO : Consider creating a property drawer for these.
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_FamilyName"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_StyleName"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_PointSize"));

            GUI.enabled = true;

            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_Scale"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_LineHeight"));

            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_AscentLine"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_CapLine"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_MeanLine"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_Baseline"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_DescentLine"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_UnderlineOffset"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_UnderlineThickness"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_StrikethroughOffset"));
            //EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("strikethroughThickness"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_SuperscriptOffset"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_SuperscriptSize"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_SubscriptOffset"));
            EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_SubscriptSize"));

            if (m_ShowObsoleteProperties_prop.boolValue)
                EditorGUILayout.PropertyField(m_FaceInfo_prop.FindPropertyRelative("m_TabWidth"));

            // TODO : Add clamping for some of these values.
            //subSize_prop.floatValue = Mathf.Clamp(subSize_prop.floatValue, 0.25f, 1f);

            EditorGUILayout.Space();
            #endregion

            // GENERATION SETTINGS
            #region Generation Settings
            rect = EditorGUILayout.GetControlRect(false, 24);

            if (GUI.Button(rect, new GUIContent("<b>Generation Settings</b>"), TM_EditorStyles.sectionHeader))
                UI_PanelState.generationSettingsPanel = !UI_PanelState.generationSettingsPanel;

            GUI.Label(rect, (UI_PanelState.generationSettingsPanel ? "" : s_UiStateLabel[1]), TM_EditorStyles.rightLabel);

            if (UI_PanelState.generationSettingsPanel)
            {
                EditorGUI.indentLevel = 1;

                EditorGUI.BeginChangeCheck();
                Font sourceFont = (Font)EditorGUILayout.ObjectField("Source Font File", m_fontAsset.SourceFont_EditorRef, typeof(Font), false);
                if (EditorGUI.EndChangeCheck())
                {
                    UpdateSourceFontFile(sourceFont);
                }

                EditorGUI.BeginDisabledGroup(sourceFont == null);
                {
                    EditorGUI.BeginChangeCheck();
                    m_FontFaceIndex_prop.intValue = EditorGUILayout.Popup(new GUIContent("Font Face"), m_FontFaceIndex_prop.intValue, m_FontFaces);
                    if (EditorGUI.EndChangeCheck())
                    {
                        UpdateFontFaceIndex(m_FontFaceIndex_prop.intValue);
                    }

                    EditorGUI.BeginChangeCheck();

                    m_AtlasPopulationMode_prop.intValue = EditorGUILayout.IntPopup(
                        new GUIContent("Atlas Population Mode"),
                        m_AtlasPopulationMode_prop.intValue,
                        new[] { new GUIContent("Static (Obsolete)"), new GUIContent("Dynamic"), new GUIContent("Dynamic OS") },
                        new[] { (int)AtlasPopulationMode.Static, (int)AtlasPopulationMode.Dynamic, (int)AtlasPopulationMode.DynamicOS });

                    if (EditorGUI.EndChangeCheck())
                    {
                        UpdateAtlasPopulationMode(m_AtlasPopulationMode_prop.intValue);
                    }

                    // Save state of atlas settings
                    if (m_DisplayDestructiveChangeWarning == false)
                    {
                        SavedGenerationSettings();
                        //Undo.RegisterCompleteObjectUndo(m_fontAsset, "Font Asset Changes");
                    }

                    EditorGUI.BeginDisabledGroup(m_AtlasPopulationMode_prop.intValue == (int)AtlasPopulationMode.Static);
                    {
                        EditorGUI.BeginChangeCheck();
                        // TODO: Switch shaders depending on GlyphRenderMode.
                        var glyphRenderValues = (GlyphRenderMode[])Enum.GetValues(typeof(GlyphRenderMode));
                        GlyphRenderMode currentValue = glyphRenderValues[m_AtlasRenderMode_prop.enumValueIndex];
                        GlyphRenderModeUI selectedUI = (GlyphRenderModeUI)currentValue;

                        selectedUI = (GlyphRenderModeUI)EditorGUILayout.EnumPopup("Render Mode", selectedUI);
                        GlyphRenderMode updatedValue = (GlyphRenderMode)selectedUI;
                        if (updatedValue != currentValue)
                        {
                            int updatedIndex = Array.IndexOf(glyphRenderValues, updatedValue);
                            m_AtlasRenderMode_prop.enumValueIndex = updatedIndex;
                            m_DisplayDestructiveChangeWarning = true;
                        }
                        EditorGUILayout.PropertyField(m_SamplingPointSize_prop, new GUIContent("Sampling Point Size"));
                        if (EditorGUI.EndChangeCheck())
                        {
                            m_DisplayDestructiveChangeWarning = true;
                        }

                        // Changes to these properties require updating Material Presets for this font asset.
                        EditorGUI.BeginChangeCheck();
                        EditorGUILayout.PropertyField(m_AtlasPadding_prop, new GUIContent("Padding"));
                        EditorGUILayout.IntPopup(m_AtlasWidth_prop, m_AtlasResolutionLabels, m_AtlasResolutions, new GUIContent("Atlas Width"));
                        EditorGUILayout.IntPopup(m_AtlasHeight_prop, m_AtlasResolutionLabels, m_AtlasResolutions, new GUIContent("Atlas Height"));
                        EditorGUILayout.PropertyField(m_IsMultiAtlasTexturesEnabled_prop, new GUIContent("Multi Atlas Textures", "Determines if the font asset will store glyphs in multiple atlas textures."));
                        if (EditorGUI.EndChangeCheck())
                        {
                            if (m_AtlasPadding_prop.intValue < 0)
                            {
                                m_AtlasPadding_prop.intValue = 0;
                                serializedObject.ApplyModifiedProperties();
                            }

                            m_MaterialPresetsRequireUpdate = true;
                            m_DisplayDestructiveChangeWarning = true;
                        }
                        EditorGUILayout.PropertyField(m_ClearDynamicDataOnBuild_prop, new GUIContent("Clear Dynamic Data On Build", "Clears all dynamic data restoring the font asset back to its default creation and empty state."));

                        if (m_ShowObsoleteProperties_prop.boolValue)
                        {
                            EditorGUILayout.PropertyField(m_GetFontFeatures_prop, getFontFeaturesLabel);
                        }

                        EditorGUILayout.Space();

                        if (m_DisplayDestructiveChangeWarning)
                        {
                            bool guiEnabledState = GUI.enabled;
                            GUI.enabled = true;

                            // These changes are destructive on the font asset
                            rect = EditorGUILayout.GetControlRect(false, 60);
                            rect.x += 15;
                            rect.width -= 15;
                            EditorGUI.HelpBox(rect, "Changing these settings will clear the font asset's character, glyph and texture data.", MessageType.Warning);

                            if (GUI.Button(new Rect(rect.width - 140, rect.y + 36, 80, 18), new GUIContent("Apply")))
                            {
                                ApplyDestructiveChanges();
                            }

                            if (GUI.Button(new Rect(rect.width - 56, rect.y + 36, 80, 18), new GUIContent("Revert")))
                            {
                                RevertDestructiveChanges();
                            }

                            GUI.enabled = guiEnabledState;
                        }
                    }
                    EditorGUI.EndDisabledGroup();
                }
                EditorGUI.EndDisabledGroup();
                EditorGUILayout.Space();
            }
            #endregion

            // ATLAS & MATERIAL PANEL
            #region Atlas & Material
            rect = EditorGUILayout.GetControlRect(false, 24);

            if (GUI.Button(rect, new GUIContent("<b>Atlas & Material</b>"), TM_EditorStyles.sectionHeader))
                UI_PanelState.fontAtlasInfoPanel = !UI_PanelState.fontAtlasInfoPanel;

            GUI.Label(rect, (UI_PanelState.fontAtlasInfoPanel ? "" : s_UiStateLabel[1]), TM_EditorStyles.rightLabel);

            if (UI_PanelState.fontAtlasInfoPanel)
            {
                EditorGUI.indentLevel = 1;

                GUI.enabled = false;
                EditorGUILayout.PropertyField(font_atlas_prop, new GUIContent("Font Atlas"));
                EditorGUILayout.PropertyField(font_material_prop, new GUIContent("Font Material"));
                GUI.enabled = true;
                EditorGUILayout.Space();
            }
            #endregion

            string evt_cmd = Event.current.commandName; // Get Current Event CommandName to check for Undo Events

            // FONT WEIGHT PANEL
            #region Font Weights
            rect = EditorGUILayout.GetControlRect(false, 24);

            if (GUI.Button(rect, new GUIContent("<b>Font Weights</b>", "The Font Assets that will be used for different font weights and the settings used to simulate a typeface when no asset is available."), TM_EditorStyles.sectionHeader))
                UI_PanelState.fontWeightPanel = !UI_PanelState.fontWeightPanel;

            GUI.Label(rect, (UI_PanelState.fontWeightPanel ? "" : s_UiStateLabel[1]), TM_EditorStyles.rightLabel);

            if (UI_PanelState.fontWeightPanel)
            {
                EditorGUIUtility.labelWidth *= 0.75f;
                EditorGUIUtility.fieldWidth *= 0.25f;

                EditorGUILayout.BeginVertical();
                EditorGUI.indentLevel = 1;
                rect = EditorGUILayout.GetControlRect(true);
                rect.x += EditorGUIUtility.labelWidth;
                rect.width = (rect.width - EditorGUIUtility.labelWidth) / 2f;
                GUI.Label(rect, "Regular Typeface", EditorStyles.label);
                rect.x += rect.width;
                GUI.Label(rect, "Italic Typeface", EditorStyles.label);

                EditorGUI.indentLevel = 1;

                EditorGUILayout.PropertyField(fontWeights_prop.GetArrayElementAtIndex(1), new GUIContent("100 - Thin"));
                EditorGUILayout.PropertyField(fontWeights_prop.GetArrayElementAtIndex(2), new GUIContent("200 - Extra-Light"));
                EditorGUILayout.PropertyField(fontWeights_prop.GetArrayElementAtIndex(3), new GUIContent("300 - Light"));
                EditorGUILayout.PropertyField(fontWeights_prop.GetArrayElementAtIndex(4), new GUIContent("400 - Regular"));
                EditorGUILayout.PropertyField(fontWeights_prop.GetArrayElementAtIndex(5), new GUIContent("500 - Medium"));
                EditorGUILayout.PropertyField(fontWeights_prop.GetArrayElementAtIndex(6), new GUIContent("600 - Semi-Bold"));
                EditorGUILayout.PropertyField(fontWeights_prop.GetArrayElementAtIndex(7), new GUIContent("700 - Bold"));
                EditorGUILayout.PropertyField(fontWeights_prop.GetArrayElementAtIndex(8), new GUIContent("800 - Heavy"));
                EditorGUILayout.PropertyField(fontWeights_prop.GetArrayElementAtIndex(9), new GUIContent("900 - Black"));

                EditorGUILayout.EndVertical();

                EditorGUILayout.Space();

                EditorGUILayout.BeginVertical();

                EditorGUILayout.BeginHorizontal();
                EditorGUILayout.PropertyField(font_normalStyle_prop, new GUIContent("Regular Weight"));
                font_normalStyle_prop.floatValue = Mathf.Clamp(font_normalStyle_prop.floatValue, -3.0f, 3.0f);
                if (GUI.changed || evt_cmd == k_UndoRedo)
                {
                    GUI.changed = false;

                    // Modify the material property on matching material presets.
                    for (int i = 0; i < m_materialPresets.Length; i++)
                        m_materialPresets[i].SetFloat("_WeightNormal", font_normalStyle_prop.floatValue);
                }

                EditorGUILayout.PropertyField(font_boldStyle_prop, new GUIContent("Bold Weight"));
                font_boldStyle_prop.floatValue = Mathf.Clamp(font_boldStyle_prop.floatValue, -3.0f, 3.0f);
                if (GUI.changed || evt_cmd == k_UndoRedo)
                {
                    GUI.changed = false;

                    // Modify the material property on matching material presets.
                    for (int i = 0; i < m_materialPresets.Length; i++)
                        m_materialPresets[i].SetFloat("_WeightBold", font_boldStyle_prop.floatValue);
                }
                EditorGUILayout.EndHorizontal();

                EditorGUILayout.BeginHorizontal();
                EditorGUILayout.PropertyField(font_normalSpacing_prop, new GUIContent("Regular Spacing"));
                font_normalSpacing_prop.floatValue = Mathf.Clamp(font_normalSpacing_prop.floatValue, -100, 100);
                if (GUI.changed || evt_cmd == k_UndoRedo)
                {
                    GUI.changed = false;
                }

                EditorGUILayout.PropertyField(font_boldSpacing_prop, new GUIContent("Bold Spacing"));
                font_boldSpacing_prop.floatValue = Mathf.Clamp(font_boldSpacing_prop.floatValue, 0, 100);
                if (GUI.changed || evt_cmd == k_UndoRedo)
                {
                    GUI.changed = false;
                }
                EditorGUILayout.EndHorizontal();

                EditorGUILayout.BeginHorizontal();
                EditorGUILayout.PropertyField(font_italicStyle_prop, new GUIContent("Italic Slant"));
                font_italicStyle_prop.intValue = Mathf.Clamp(font_italicStyle_prop.intValue, 15, 60);

                if (m_ShowObsoleteProperties_prop.boolValue)
                    EditorGUILayout.PropertyField(font_tabSize_prop, new GUIContent("Tab Multiple"));
                else
                    EditorGUILayout.LabelField("");

                EditorGUILayout.EndHorizontal();
                EditorGUILayout.EndVertical();
                EditorGUILayout.Space();
            }

            EditorGUIUtility.labelWidth = 0;
            EditorGUIUtility.fieldWidth = 0;
            #endregion

            // FALLBACK FONT ASSETS
            #region Fallback Font Asset
            rect = EditorGUILayout.GetControlRect(false, 24);
            EditorGUI.indentLevel = 0;
            if (GUI.Button(rect, new GUIContent("<b>Fallback Font Assets</b>", "Select the Font Assets that will be searched and used as fallback when characters are missing from this font asset."), TM_EditorStyles.sectionHeader))
                UI_PanelState.fallbackFontAssetPanel = !UI_PanelState.fallbackFontAssetPanel;

            GUI.Label(rect, (UI_PanelState.fallbackFontAssetPanel ? "" : s_UiStateLabel[1]), TM_EditorStyles.rightLabel);

            if (UI_PanelState.fallbackFontAssetPanel)
            {
                EditorGUIUtility.labelWidth = 120;
                EditorGUI.indentLevel = 0;
                EditorGUI.BeginChangeCheck();
                m_FallbackFontAssetList.DoLayoutList();
                if (EditorGUI.EndChangeCheck())
                {
                    m_IsFallbackGlyphCacheDirty = true;
                }
                EditorGUILayout.Space();
            }
            #endregion

            // CHARACTER TABLE TABLE
            if (m_ShowObsoleteProperties_prop.boolValue)
            {
            #region Character Table
            EditorGUIUtility.labelWidth = labelWidth;
            EditorGUIUtility.fieldWidth = fieldWidth;
            EditorGUI.indentLevel = 0;
            rect = EditorGUILayout.GetControlRect(false, 24);

            int characterCount = m_fontAsset.characterTable.Count;

            if (GUI.Button(rect, new GUIContent("<b>Character Table</b>   [" + characterCount + "]" + (rect.width > 320 ? " Characters" : ""), "List of characters contained in this font asset."), TM_EditorStyles.sectionHeader))
                UI_PanelState.characterTablePanel = !UI_PanelState.characterTablePanel;

            GUI.Label(rect, (UI_PanelState.characterTablePanel ? "" : s_UiStateLabel[1]), TM_EditorStyles.rightLabel);

            if (UI_PanelState.characterTablePanel)
            {
                int arraySize = m_CharacterTable_prop.arraySize;
                int itemsPerPage = 15;

                // Display Glyph Management Tools
                EditorGUILayout.BeginVertical(EditorStyles.helpBox);
                {
                    // Search Bar implementation
                    #region DISPLAY SEARCH BAR
                    EditorGUILayout.BeginHorizontal();
                    {
                        EditorGUIUtility.labelWidth = 130f;
                        EditorGUI.BeginChangeCheck();
                        string searchPattern = EditorGUILayout.TextField("Character Search", m_CharacterSearchPattern, "SearchTextField");
                        if (EditorGUI.EndChangeCheck() || m_isSearchDirty)
                        {
                            if (string.IsNullOrEmpty(searchPattern) == false)
                            {
                                m_CharacterSearchPattern = searchPattern;

                                // Search Character Table for potential matches
                                SearchCharacterTable(m_CharacterSearchPattern, ref m_CharacterSearchList);
                            }
                            else
                                m_CharacterSearchPattern = null;

                            m_isSearchDirty = false;
                        }

                        string styleName = string.IsNullOrEmpty(m_CharacterSearchPattern) ? "SearchCancelButtonEmpty" : "SearchCancelButton";
                        if (GUILayout.Button(GUIContent.none, styleName))
                        {
                            GUIUtility.keyboardControl = 0;
                            m_CharacterSearchPattern = string.Empty;
                        }
                    }
                    EditorGUILayout.EndHorizontal();
                    #endregion

                    // Display Page Navigation
                    if (!string.IsNullOrEmpty(m_CharacterSearchPattern))
                        arraySize = m_CharacterSearchList.Count;

                    DisplayPageNavigation(ref m_CurrentCharacterPage, arraySize, itemsPerPage);
                }
                EditorGUILayout.EndVertical();

                // Display Character Table Elements
                if (arraySize > 0)
                {
                    // Display each character entry using the CharacterPropertyDrawer.
                    for (int i = itemsPerPage * m_CurrentCharacterPage; i < arraySize && i < itemsPerPage * (m_CurrentCharacterPage + 1); i++)
                    {
                        // Define the start of the selection region of the element.
                        Rect elementStartRegion = GUILayoutUtility.GetRect(0f, 0f, GUILayout.ExpandWidth(true));

                        int elementIndex = i;
                        if (!string.IsNullOrEmpty(m_CharacterSearchPattern))
                            elementIndex = m_CharacterSearchList[i];

                        SerializedProperty characterProperty = m_CharacterTable_prop.GetArrayElementAtIndex(elementIndex);

                        EditorGUILayout.BeginVertical(EditorStyles.helpBox);

                        EditorGUI.BeginDisabledGroup(i != m_SelectedCharacterRecord);
                        {
                            EditorGUILayout.PropertyField(characterProperty);
                        }
                        EditorGUI.EndDisabledGroup();

                        EditorGUILayout.EndVertical();

                        // Define the end of the selection region of the element.
                        Rect elementEndRegion = GUILayoutUtility.GetRect(0f, 0f, GUILayout.ExpandWidth(true));

                        // Check for Item selection
                        Rect selectionArea = new Rect(elementStartRegion.x, elementStartRegion.y, elementEndRegion.width, elementEndRegion.y - elementStartRegion.y);
                        if (DoSelectionCheck(selectionArea))
                        {
                            if (m_SelectedCharacterRecord == i)
                                m_SelectedCharacterRecord = -1;
                            else
                            {
                                m_SelectedCharacterRecord = i;
                                m_AddCharacterWarning.isEnabled = false;
                                m_unicodeHexLabel = k_placeholderUnicodeHex;
                                GUIUtility.keyboardControl = 0;
                            }
                        }

                        // Draw Selection Highlight and Glyph Options
                        if (m_SelectedCharacterRecord == i)
                        {
                            // Reset other selections
                            ResetSelections(RecordSelectionType.CharacterRecord);

                            TextCoreEditorUtilities.DrawBox(selectionArea, 2f, new Color32(40, 192, 255, 255));

                            // Draw Glyph management options
                            Rect controlRect = EditorGUILayout.GetControlRect(true, EditorGUIUtility.singleLineHeight * 1f);
                            float optionAreaWidth = controlRect.width * 0.6f;
                            float btnWidth = optionAreaWidth / 3;

                            Rect position = new Rect(controlRect.x + controlRect.width * .4f, controlRect.y, btnWidth, controlRect.height);

                            // Copy Selected Glyph to Target Glyph ID
                            GUI.enabled = !string.IsNullOrEmpty(m_dstUnicode);
                            if (GUI.Button(position, new GUIContent("Copy to")))
                            {
                                GUIUtility.keyboardControl = 0;

                                // Convert Hex Value to Decimal
                                int dstGlyphID = (int)TextUtilities.StringHexToInt(m_dstUnicode);

                                //Add new glyph at target Unicode hex id.
                                if (!AddNewCharacter(elementIndex, dstGlyphID))
                                {
                                    m_AddCharacterWarning.isEnabled = true;
                                    m_AddCharacterWarning.expirationTime = EditorApplication.timeSinceStartup + 1;
                                }

                                m_dstUnicode = string.Empty;
                                m_isSearchDirty = true;

                                TextEventManager.ON_FONT_PROPERTY_CHANGED(true, m_fontAsset);
                            }

                            // Target Glyph ID
                            GUI.enabled = true;
                            position.x += btnWidth;

                            GUI.SetNextControlName("CharacterID_Input");
                            m_dstUnicode = EditorGUI.TextField(position, m_dstUnicode);

                            // Placeholder text
                            EditorGUI.LabelField(position, new GUIContent(m_unicodeHexLabel, "The Unicode (Hex) ID of the duplicated Character"), TM_EditorStyles.label);

                            // Only filter the input when the destination glyph ID text field has focus.
                            if (GUI.GetNameOfFocusedControl() == "CharacterID_Input")
                            {
                                m_unicodeHexLabel = string.Empty;

                                //Filter out unwanted characters.
                                char chr = Event.current.character;
                                if ((chr < '0' || chr > '9') && (chr < 'a' || chr > 'f') && (chr < 'A' || chr > 'F'))
                                {
                                    Event.current.character = '\0';
                                }
                            }
                            else
                            {
                                m_unicodeHexLabel = k_placeholderUnicodeHex;
                                //m_dstUnicode = string.Empty;
                            }


                            // Remove Glyph
                            position.x += btnWidth;
                            if (GUI.Button(position, "Remove"))
                            {
                                GUIUtility.keyboardControl = 0;

                                RemoveCharacterFromList(elementIndex);

                                isAssetDirty = true;
                                m_SelectedCharacterRecord = -1;
                                m_isSearchDirty = true;
                                break;
                            }

                            if (m_AddCharacterWarning.isEnabled && EditorApplication.timeSinceStartup < m_AddCharacterWarning.expirationTime)
                            {
                                EditorGUILayout.HelpBox("The Destination Character ID already exists", MessageType.Warning);
                            }
                        }
                    }
                }

                DisplayPageNavigation(ref m_CurrentCharacterPage, arraySize, itemsPerPage);

                EditorGUILayout.Space();
            }
            #endregion
            }

            // GLYPH TABLE
            if (m_ShowObsoleteProperties_prop.boolValue)
            {
            #region Glyph Table
            EditorGUIUtility.labelWidth = labelWidth;
            EditorGUIUtility.fieldWidth = fieldWidth;
            EditorGUI.indentLevel = 0;
            rect = EditorGUILayout.GetControlRect(false, 24);

            GUIStyle glyphPanelStyle = new GUIStyle(EditorStyles.helpBox);

            int glyphCount = m_fontAsset.glyphTable.Count;

            if (GUI.Button(rect, new GUIContent("<b>Glyph Table</b>   [" + glyphCount + "]" + (rect.width > 275 ? " Glyphs" : ""), "List of glyphs contained in this font asset."), TM_EditorStyles.sectionHeader))
                UI_PanelState.glyphTablePanel = !UI_PanelState.glyphTablePanel;

            GUI.Label(rect, (UI_PanelState.glyphTablePanel ? "" : s_UiStateLabel[1]), TM_EditorStyles.rightLabel);

            if (UI_PanelState.glyphTablePanel)
            {
                int arraySize = m_GlyphTable_prop.arraySize;
                int itemsPerPage = 15;

                // Display Glyph Management Tools
                EditorGUILayout.BeginVertical(EditorStyles.helpBox);
                {
                    // Search Bar implementation
                    #region DISPLAY SEARCH BAR
                    EditorGUILayout.BeginHorizontal();
                    {
                        EditorGUIUtility.labelWidth = 130f;
                        EditorGUI.BeginChangeCheck();
                        string searchPattern = EditorGUILayout.TextField("Glyph Search", m_GlyphSearchPattern, "SearchTextField");
                        if (EditorGUI.EndChangeCheck() || m_isSearchDirty)
                        {
                            if (string.IsNullOrEmpty(searchPattern) == false)
                            {
                                m_GlyphSearchPattern = searchPattern;

                                // Search Glyph Table for potential matches
                                SearchGlyphTable(m_GlyphSearchPattern, ref m_GlyphSearchList);
                            }
                            else
                                m_GlyphSearchPattern = null;

                            m_isSearchDirty = false;
                        }

                        string styleName = string.IsNullOrEmpty(m_GlyphSearchPattern) ? "SearchCancelButtonEmpty" : "SearchCancelButton";
                        if (GUILayout.Button(GUIContent.none, styleName))
                        {
                            GUIUtility.keyboardControl = 0;
                            m_GlyphSearchPattern = string.Empty;
                        }
                    }
                    EditorGUILayout.EndHorizontal();
                    #endregion

                    // Display Page Navigation
                    if (!string.IsNullOrEmpty(m_GlyphSearchPattern))
                        arraySize = m_GlyphSearchList.Count;

                    DisplayPageNavigation(ref m_CurrentGlyphPage, arraySize, itemsPerPage);
                }
                EditorGUILayout.EndVertical();

                // Display Glyph Table Elements

                if (arraySize > 0)
                {
                    // Display each GlyphInfo entry using the GlyphInfo property drawer.