From f2c544dc65f6fb8a83b05f71bb757044cbe371bf Mon Sep 17 00:00:00 2001
From: Ellpeck <megamaximal@gmail.com>
Date: Tue, 9 Jun 2020 18:56:01 +0200
Subject: [PATCH] modified link behavior for paragraphs to be easier to modify

---
 Demos.Android/Activity1.cs         | 10 ++++++++--
 Demos.Android/Demos.Android.csproj |  4 ++++
 MLEM.Ui/Elements/Paragraph.cs      |  9 ++-------
 MLEM.Ui/UiSystem.cs                | 10 +++++++++-
 4 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/Demos.Android/Activity1.cs b/Demos.Android/Activity1.cs
index 6ee2b0e..4ae7af1 100644
--- a/Demos.Android/Activity1.cs
+++ b/Demos.Android/Activity1.cs
@@ -1,5 +1,7 @@
 using Android.App;
+using Android.Content;
 using Android.Content.PM;
+using Android.Net;
 using Android.OS;
 using Android.Views;
 using Microsoft.Xna.Framework;
@@ -31,8 +33,12 @@ namespace Demos.Android {
             this.game = new GameImpl();
             // reset MlemGame width and height to use device's aspect ratio
             this.game.GraphicsDeviceManager.ResetWidthAndHeight(this.game.Window);
-            // disable mouse handling for android to make emulator behavior more coherent
-            this.game.OnLoadContent += game => game.InputHandler.HandleMouse = false;
+            this.game.OnLoadContent += game => {
+                // disable mouse handling for android to make emulator behavior more coherent
+                game.InputHandler.HandleMouse = false;
+                // make text links be opened properly
+                game.UiSystem.LinkBehavior = l => this.StartActivity(new Intent(Intent.ActionView, Uri.Parse(l.Match.Groups[1].Value)));
+            };
             // set the game to fullscreen to cause the status bar to be hidden
             this.game.GraphicsDeviceManager.IsFullScreen = true;
             this.view = this.game.Services.GetService(typeof(View)) as View;
diff --git a/Demos.Android/Demos.Android.csproj b/Demos.Android/Demos.Android.csproj
index d396e9a..ea3454a 100644
--- a/Demos.Android/Demos.Android.csproj
+++ b/Demos.Android/Demos.Android.csproj
@@ -83,6 +83,10 @@
         <Project>{997f4739-7bec-4621-b9ca-68deb2d74412}</Project>
         <Name>MLEM.Startup</Name>
       </ProjectReference>
+      <ProjectReference Include="..\MLEM.Ui\MLEM.Ui.csproj">
+        <Project>{6f00629a-8b87-4264-8896-19983285e32f}</Project>
+        <Name>MLEM.Ui</Name>
+      </ProjectReference>
       <ProjectReference Include="..\MLEM\MLEM.csproj">
         <Project>{1d6ab762-43c4-4775-8924-707c7ec3f142}</Project>
         <Name>MLEM</Name>
diff --git a/MLEM.Ui/Elements/Paragraph.cs b/MLEM.Ui/Elements/Paragraph.cs
index dd86630..8dedb66 100644
--- a/MLEM.Ui/Elements/Paragraph.cs
+++ b/MLEM.Ui/Elements/Paragraph.cs
@@ -241,13 +241,8 @@ namespace MLEM.Ui.Elements {
                         link.IsSelected = false;
                 };
                 this.OnPressed += e => {
-                    foreach (var code in token.AppliedCodes.OfType<LinkCode>()) {
-                        try {
-                            Process.Start(code.Match.Groups[1].Value);
-                        } catch (Exception) {
-                            // ignored
-                        }
-                    }
+                    foreach (var code in token.AppliedCodes.OfType<LinkCode>())
+                        this.System?.LinkBehavior?.Invoke(code);
                 };
             }
 
diff --git a/MLEM.Ui/UiSystem.cs b/MLEM.Ui/UiSystem.cs
index 2a398b6..e69af66 100644
--- a/MLEM.Ui/UiSystem.cs
+++ b/MLEM.Ui/UiSystem.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Text.RegularExpressions;
 using Microsoft.Xna.Framework;
@@ -99,6 +100,12 @@ namespace MLEM.Ui {
         /// </summary>
         public TextFormatter TextFormatter;
         /// <summary>
+        /// The action that should be executed when a <see cref="LinkCode"/> in a paragraph's <see cref="Paragraph.TokenizedText"/> is pressed.
+        /// The actual link stored in the link code is stored in its <see cref="LinkCode.Match"/>'s 1st group.
+        /// By default, the browser is opened with the given link's address.
+        /// </summary>
+        public Action<LinkCode> LinkBehavior = l => Process.Start(l.Match.Groups[1].Value);
+        /// <summary>
         /// The <see cref="UiControls"/> that this ui system is controlled by.
         /// The ui controls are also the place to change bindings for controller and keyboard input.
         /// </summary>
@@ -213,7 +220,8 @@ namespace MLEM.Ui {
             };
 
             this.TextFormatter = new TextFormatter();
-            this.TextFormatter.Codes.Add(new Regex("<l(?: ([^>]+))?>"), (f, m, r) => new LinkCode(m, r, 1 / 16F, 0.85F, t => this.Controls.MousedElement is Paragraph.Link link && link.Token == t));
+            this.TextFormatter.Codes.Add(new Regex("<l(?: ([^>]+))?>"), (f, m, r) => new LinkCode(m, r, 1 / 16F, 0.85F,
+                t => this.Controls.MousedElement is Paragraph.Link l1 && l1.Token == t || this.Controls.TouchedElement is Paragraph.Link l2 && l2.Token == t));
         }
 
         /// <summary>