# HG changeset patch
# User Alys Brooks <alysbrooks@fastmail.com>
# Date 2023-01-11 07:26:18
# Node ID 4370c4f6e8f816fe980715b436d0024d0e50cdf9
# Parent  b3e89dc5598bef1ff0524d616300f98c7f646e95

Only scroll after a slight delay.

Wait about 1/3 of a second before beginning to scroll. Otherwise it becomes too
easy to trigger by mistake when mousing over to the toolbar.

diff --git a/isometric-park-fna/Engines/InputEngine.cs b/isometric-park-fna/Engines/InputEngine.cs
--- a/isometric-park-fna/Engines/InputEngine.cs
+++ b/isometric-park-fna/Engines/InputEngine.cs
@@ -46,6 +46,9 @@
         private int height;
         private int width;
 
+        private double timeInRange;
+        private const double SCROLL_THRESHOLD = 0.333f;
+
         public InputEngine(int menuBarHeight, Camera camera,
                            GraphicsDeviceManager gdm, int height, int width) {
             //initialize to blank for now
@@ -56,6 +59,8 @@
             this.graphicsDevice = gdm.GraphicsDevice;
             this.height = height;
             this.width = width;
+
+            this.timeInRange = 0.0f;
         }
 
 
@@ -245,20 +250,33 @@
             #endregion misc_keys
             #region mouse_movement
 
+            var within_top_range = MathUtils.BetweenExclusive(mouseCur.Y, menuBarHeight, 50 + menuBarHeight);
+            var within_bottom_range  = MathUtils.BetweenExclusive(mouseCur.Y, (viewHeight - 50 -menuBarHeight), viewHeight-menuBarHeight);
+            var within_left_range = MathUtils.BetweenExclusive(mouseCur.X, 0, 50);
+            var within_right_range = MathUtils.BetweenExclusive(mouseCur.X, (viewWidth - 50), viewWidth);
 
-            if (MathUtils.BetweenExclusive(mouseCur.Y, menuBarHeight, 50 + menuBarHeight))
+            if (within_top_range || within_bottom_range || within_right_range || within_left_range)
+            {
+                this.timeInRange += dt;
+            }
+            else
+            {
+                this.timeInRange = 0;
+            }
+
+            if (within_top_range && this.timeInRange > SCROLL_THRESHOLD)
             {
                 SendMessage(new MoveCameraMessage {Movement = new Vector2(0, -4)});
             }
-            else if (MathUtils.BetweenExclusive(mouseCur.Y, (viewHeight - 50 -menuBarHeight), viewHeight-menuBarHeight))
+            else if (within_bottom_range && this.timeInRange > SCROLL_THRESHOLD)
             {
                 SendMessage(new MoveCameraMessage {Movement = new Vector2(0, 4)});
             }
-            if (MathUtils.BetweenExclusive(mouseCur.X, 0, 50))
+            if (within_left_range && this.timeInRange > SCROLL_THRESHOLD)
             {
                 SendMessage(new MoveCameraMessage {Movement = new Vector2(-4, 0)});
             }
-            else if (MathUtils.BetweenExclusive(mouseCur.X, (viewWidth - 50), viewWidth))
+            else if (within_right_range && this.timeInRange > SCROLL_THRESHOLD)
             {
                 SendMessage(new MoveCameraMessage {Movement = new Vector2(4, 0)});
             }