From ac3bc30a30d3daeb912c989accbb0fb08ea6e582 Mon Sep 17 00:00:00 2001
From: Niels Martin Hansen <nielsm@indvikleren.dk>
Date: Sat, 4 Jan 2020 23:06:49 +0100
Subject: [PATCH] Add: Highlight item under mouse in file browser

---
 src/fios_gui.cpp | 30 ++++++++++++++++++++++++++++++
 src/gfx_func.h   |  1 +
 2 files changed, 31 insertions(+)

diff --git a/src/fios_gui.cpp b/src/fios_gui.cpp
index de66d6b890..9f8b45413f 100644
--- a/src/fios_gui.cpp
+++ b/src/fios_gui.cpp
@@ -271,6 +271,7 @@ private:
 	FileList fios_items;          ///< Save game list.
 	FiosItem o_dir;               ///< Original dir (home dir for this browser)
 	const FiosItem *selected;     ///< Selected game in #fios_items, or \c nullptr.
+	const FiosItem *highlighted;  ///< Item in fios_items highlighted by mouse pointer, or \c nullptr.
 	Scrollbar *vscroll;
 
 	StringFilter string_filter; ///< Filter for available games.
@@ -445,6 +446,8 @@ public:
 
 					if (item == this->selected) {
 						GfxFillRect(r.left + 1, y, r.right, y + this->resize.step_height, PC_DARK_BLUE);
+					} else if (item == this->highlighted) {
+						GfxFillRect(r.left + 1, y, r.right, y + this->resize.step_height, PC_VERY_DARK_BLUE);
 					}
 					DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, item->title, _fios_colours[GetDetailedFileType(item->type)]);
 					y += this->resize.step_height;
@@ -714,6 +717,33 @@ public:
 		}
 	}
 
+	void OnMouseLoop() override
+	{
+		const Point pt{ _cursor.pos.x - this->left, _cursor.pos.y - this->top };
+		const int widget = GetWidgetFromPos(this, pt.x, pt.y);
+
+		if (widget == WID_SL_DRIVES_DIRECTORIES_LIST) {
+			int y = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_SL_DRIVES_DIRECTORIES_LIST, WD_FRAMERECT_TOP);
+			if (y == INT_MAX) return;
+
+			/* Get the corresponding non-filtered out item from the list */
+			int i = 0;
+			while (i <= y) {
+				if (!this->fios_items_shown[i]) y++;
+				i++;
+			}
+			const FiosItem *file = this->fios_items.Get(y);
+
+			if (file != this->highlighted) {
+				this->highlighted = file;
+				this->SetWidgetDirty(WID_SL_DRIVES_DIRECTORIES_LIST);
+			}
+		} else if (this->highlighted != nullptr) {
+			this->highlighted = nullptr;
+			this->SetWidgetDirty(WID_SL_DRIVES_DIRECTORIES_LIST);
+		}
+	}
+
 	EventState OnKeyPress(WChar key, uint16 keycode) override
 	{
 		if (keycode == WKC_ESC) {
diff --git a/src/gfx_func.h b/src/gfx_func.h
index a0b46a477b..ea133acfc1 100644
--- a/src/gfx_func.h
+++ b/src/gfx_func.h
@@ -219,6 +219,7 @@ static const uint8 PC_VERY_LIGHT_YELLOW  = 0x45;           ///< Almost-white yel
 
 static const uint8 PC_GREEN              = 0xD0;           ///< Green palette colour.
 
+static const uint8 PC_VERY_DARK_BLUE     = 0x9A;           ///< Almost-black blue palette colour.
 static const uint8 PC_DARK_BLUE          = 0x9D;           ///< Dark blue palette colour.
 static const uint8 PC_LIGHT_BLUE         = 0x98;           ///< Light blue palette colour.