Implemented the add text element function

I18N Commander/Processor/TextElementProcessor.cs

@@ -1,5 +1,4 @@
-using System.Collections;
+using DataModel.Database;
-using DataModel.Database;
 using DataModel.Database.Common;
 using Microsoft.EntityFrameworkCore;
 
@@ -11,4 +10,49 @@ public static class TextElementProcessor
     {
         return Task.FromResult(db.TextElements.Where(n => n.Section == section).AsAsyncEnumerable());
     }
+
+    public static async Task<ProcessorResult<TextElement>> AddTextElement(DataContext db, string? currentSectionKey, string elementName)
+    {
+        if(string.IsNullOrWhiteSpace(currentSectionKey))
+            throw new ArgumentOutOfRangeException(nameof(currentSectionKey));
+        
+        var currentSection = await db.Sections.FirstOrDefaultAsync(n => n.DataKey == currentSectionKey);
+        if (currentSection is null)
+            throw new ArgumentOutOfRangeException(nameof(currentSectionKey));
+
+        // Remove any whitespaces from the element name, regardless of how many e.g. spaces the user typed:
+        var code = string.Join('_', elementName.Split(' ', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries)).ToUpperInvariant();
+        
+        // Check, if this key already exists:
+        if (await db.TextElements.AnyAsync(n => n.Section == currentSection && n.Code == code))
+        {
+            var rng = new Random();
+            while (await db.TextElements.AnyAsync(n => n.Section == currentSection && n.Code == code))
+            {
+                // Add a random number to the end of the key:
+                code += $"_{rng.Next(1, 10_000)}";
+            }
+        }
+        
+        var textElement = new TextElement
+        {
+            Name = elementName,
+            Code = code,
+            Section = currentSection,
+        };
+        
+        // Add the new element to the database:
+        await db.TextElements.AddAsync(textElement);
+
+        try
+        {
+            // Save the changes:
+            await db.SaveChangesAsync();
+            return new ProcessorResult<TextElement>(textElement);
+        }
+        catch (DbUpdateException updateException)
+        {
+            return updateException.ToProcessorResult<TextElement>();
+        }
+    }
 }

I18N Commander/UI WinForms/Components/TextElements.Designer.cs

@@ -37,8 +37,8 @@
             this.listTextElements = new System.Windows.Forms.ListBox();
             this.textBoxFilter = new System.Windows.Forms.TextBox();
             this.labelFilter = new System.Windows.Forms.Label();
-            this.toolTip = new System.Windows.Forms.ToolTip(this.components);
             this.labelSectionPath = new System.Windows.Forms.Label();
+            this.toolTip = new System.Windows.Forms.ToolTip(this.components);
             this.tableLayout.SuspendLayout();
             this.flowLayoutToolbar.SuspendLayout();
             this.SuspendLayout();
@@ -90,6 +90,7 @@
             this.buttonAdd.TabIndex = 0;
             this.toolTip.SetToolTip(this.buttonAdd, "Add text element to selected section");
             this.buttonAdd.UseVisualStyleBackColor = true;
+            this.buttonAdd.Click += new System.EventHandler(this.buttonAdd_Click);
             // 
             // buttonRemove
             // 
@@ -103,6 +104,7 @@
             this.buttonRemove.TabIndex = 2;
             this.toolTip.SetToolTip(this.buttonRemove, "Delete this text element");
             this.buttonRemove.UseVisualStyleBackColor = true;
+            this.buttonRemove.Click += new System.EventHandler(this.buttonRemove_Click);
             // 
             // buttonRename
             // 
@@ -116,6 +118,7 @@
             this.buttonRename.TabIndex = 1;
             this.toolTip.SetToolTip(this.buttonRename, "Rename this text element");
             this.buttonRename.UseVisualStyleBackColor = true;
+            this.buttonRename.Click += new System.EventHandler(this.buttonRename_Click);
             // 
             // listTextElements
             // 
@@ -150,14 +153,6 @@
             this.labelFilter.Text = "Filter:";
             this.labelFilter.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
             // 
-            // toolTip
-            // 
-            this.toolTip.AutoPopDelay = 30000;
-            this.toolTip.InitialDelay = 500;
-            this.toolTip.ReshowDelay = 100;
-            this.toolTip.ToolTipIcon = System.Windows.Forms.ToolTipIcon.Info;
-            this.toolTip.ToolTipTitle = "Help";
-            // 
             // labelSectionPath
             // 
             this.labelSectionPath.AutoSize = true;
@@ -171,6 +166,14 @@
             this.labelSectionPath.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
             this.toolTip.SetToolTip(this.labelSectionPath, "The path of the currently selected section");
             // 
+            // toolTip
+            // 
+            this.toolTip.AutoPopDelay = 30000;
+            this.toolTip.InitialDelay = 500;
+            this.toolTip.ReshowDelay = 100;
+            this.toolTip.ToolTipIcon = System.Windows.Forms.ToolTipIcon.Info;
+            this.toolTip.ToolTipTitle = "Help";
+            // 
             // TextElements
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(120F, 120F);

I18N Commander/UI WinForms/Components/TextElements.cs

@@ -2,6 +2,7 @@
 using DataModel.Database.Common;
 using Microsoft.Extensions.DependencyInjection;
 using Processor;
+using UI_WinForms.Dialogs;
 
 namespace UI_WinForms.Components;
 
@@ -55,10 +56,51 @@ public partial class TextElements : UserControl
         {
             var item = new ListViewItem(textElement.Name)
             {
-                Tag = textElement
+                Tag = textElement.Code,
             };
             
             this.listTextElements.Items.Add(item);
         }
     }
+    
+    private async void buttonAdd_Click(object sender, EventArgs e)
+    {
+        if(this.DesignMode)
+            return;
+        
+        var result = InputDialog.Show(new InputDialog.Options(
+            Message: "Please type the desired text element's name.",
+            Title: "Add a text element",
+            Placeholder: "My text element",
+            ShowQuestionCheckbox: false
+        ));
+        
+        if(result.DialogResult == DialogResult.Cancel)
+            return;
+        
+        // Add the text element to the database into the current section:
+        var newTextElement = await TextElementProcessor.AddTextElement(this.db, this.currentSection?.DataKey, result.Text);
+        newTextElement.ProcessError();
+        
+        if(!newTextElement.Successful)
+            return;
+        
+        // Add the text element to the list:
+        var item = new ListViewItem(newTextElement.Result!.Name)
+        {
+            Tag = newTextElement.Result.Code,
+        };
+
+        this.listTextElements.Items.Add(item);
+    }
+
+    private void buttonRemove_Click(object sender, EventArgs e)
+    {
+
+    }
+    
+    private void buttonRename_Click(object sender, EventArgs e)
+    {
+
+    }
 }

I18N Commander/UI WinForms/Components/TextElements.resx

@@ -60,4 +60,10 @@
   <metadata name="toolTip.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>17, 17</value>
   </metadata>
+  <metadata name="toolTip.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
+  <metadata name="toolTip.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
 </root>