Project pages (e.g. production tables, production summaries) get 50% …

…bottom padding to enable scrolling past the last row

The base class Scrollable is used in different places (e.g. project pages, item explorer). To ensure that only those subclasses that need vertical bottom padding the padding factor has a default value of 0%. Project pages switch that to 50% to enable scrolling past the last row.

Closes #14

YAFC/Workspace/ProjectPageView.cs

@@ -58,7 +58,8 @@ public void Build(ImGui gui, Vector2 visibleSize) {
             else
                 gui.AllocateRect(contentWidth, headerHeight);
 
-            base.Build(gui, visibleSize.Y - headerHeight);
+            // 50% visible height gets added to the content height to enable scrolling past the last row
+            base.Build(gui, visibleSize.Y - headerHeight, 0.5f);
         }
 
         protected override Vector2 MeasureContent(Rect rect, ImGui gui) {

YAFCui/ImGui/ScrollArea.cs

@@ -22,7 +22,7 @@ protected Scrollable(bool vertical, bool horizontal, bool collapsible) {
 
         protected abstract void PositionContent(ImGui gui, Rect viewport);
 
-        public void Build(ImGui gui, float height) {
+        public void Build(ImGui gui, float height, float heightPaddingFactor = 0f) {
             this.gui = gui;
             this.height = height;
             var rect = gui.statePosition;
@@ -33,6 +33,9 @@ public void Build(ImGui gui, float height) {
                 var innerRect = rect;
                 innerRect.Width = width;
                 contentSize = MeasureContent(innerRect, gui);
+                if (contentSize.Y > height) {
+                    contentSize.Y += height * heightPaddingFactor;
+                }
                 maxScroll = Vector2.Max(contentSize - new Vector2(innerRect.Width, height), Vector2.Zero);
                 var realHeight = collapsible ? MathF.Min(contentSize.Y, height) : height;
                 innerRect.Height = rect.Height = realHeight;