From 4839adf6c1f1783cf7b612bd3fa8dfb0db463c8f Mon Sep 17 00:00:00 2001
From: Jason Hilder <jhilder95@gmail.com>
Date: Fri, 12 Jun 2026 09:44:24 +0200
Subject: [PATCH] Initial workings for components.

---
 src/simulator/left_panel.odin | 108 ++++++++++++++++++++++++++--------
 1 file changed, 84 insertions(+), 24 deletions(-)

diff --git a/src/simulator/left_panel.odin b/src/simulator/left_panel.odin
index 39fc054..26abbb2 100644
--- a/src/simulator/left_panel.odin
+++ b/src/simulator/left_panel.odin
@@ -5,6 +5,7 @@ import "core:strings"
 import rl "vendor:raylib"
 
 gui_left_panel :: proc(rect: rl.Rectangle, sim: ^Simulator) {
+	// ── Top panel and components ──
 	top_panel := rl.Rectangle {
 		rect.x,
 		rect.y,
@@ -12,8 +13,18 @@ gui_left_panel :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 		rect.height / 2,
 	}
 	rl.DrawRectangleLinesEx(top_panel, 1, rl.DARKGRAY)
-	gui_file_loader(top_panel)
 
+	// Dropzone/file loader
+	file_loader_rect := rl.Rectangle {
+		top_panel.x + PANEL_PADDING,
+		top_panel.y + PANEL_HEADER,
+		top_panel.width - PANEL_PADDING * 2,
+		(top_panel.height / 3) - PANEL_HEADER - PANEL_PADDING * 2,
+	}
+	rl.GuiPanel(file_loader_rect, "Rom / File")
+	gui_file_loader(file_loader_rect)
+
+	// ── Bottom panel and components ──
 	bottom_panel := rl.Rectangle {
 		rect.x,
 		rect.y + top_panel.height,
@@ -24,49 +35,98 @@ gui_left_panel :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 	gui_key_pad(bottom_panel, sim.machine.keypad, sim.font)
 }
 
-gui_file_loader :: proc(rect: rl.Rectangle,) {
+gui_file_loader :: proc(rect: rl.Rectangle) {
+	// drop-zone occupies the panel's content area, minus space for the button
+	drop_zone := rl.Rectangle {
+		rect.x + PANEL_PADDING,
+		rect.y + PANEL_HEADER + PANEL_PADDING,
+		rect.width - PANEL_PADDING * 2,
+		rect.height - PANEL_HEADER - PANEL_PADDING * 2 - BUTTON_HEIGHT - PANEL_PADDING,
+	}
+	rl.DrawRectangleLinesEx(drop_zone, 1, rl.GREEN)
+
+	// centered drop-zone text
+	text: cstring = "Drop a CHIP-8 ROM here"
+	text_width := rl.MeasureText(text, DROP_FONT_SIZE)
+	text_x := drop_zone.x + (drop_zone.width - f32(text_width)) / 2
+	text_y := drop_zone.y + (drop_zone.height - f32(DROP_FONT_SIZE)) / 2
+	rl.DrawText(text, i32(text_x), i32(text_y), DROP_FONT_SIZE, rl.GRAY)
+
+	// open rom button below drop-zone
+	btn_rect := rl.Rectangle {
+		drop_zone.x,
+		drop_zone.y + drop_zone.height + PANEL_PADDING,
+		BUTTON_WIDTH,
+		BUTTON_HEIGHT,
+	}
+
+	if rl.GuiButton(btn_rect, "Open ROM") {
+		// @TODO: get tinyfiledialog working here
+	}
+
+	// Handle file drop
 	if rl.IsFileDropped() {
-		log.info("file drop found!")
 		dropped_file := rl.LoadDroppedFiles()
+		if dropped_file.count > 0 {
+			mouse := rl.GetMousePosition()
 
-		if dropped_file.count > 1 {
-			path_str := string(dropped_file.paths[0])
-			log.info("file dropped: ", path_str)
+			if rl.CheckCollisionPointRec(mouse, drop_zone) {
+				path_str := string(dropped_file.paths[0])
+				log.info("file dropped: ", path_str)
+				// @TODO: Stop sim, reset mem etc, load new rom
+			} else {
+				log.info("File dropped outside drop zone, ignoring")
+			}
 		}
-
 		rl.UnloadDroppedFiles(dropped_file)
 	}
 }
 
-gui_key_pad :: proc(rect: rl.Rectangle, display: [16]bool, font: rl.Font)  {
-	Key :: struct { label: string, index: int}
+gui_key_pad :: proc(rect: rl.Rectangle, display: [16]bool, font: rl.Font) {
+	rl.GuiPanel(rect, "Input / Keypad")
+
+	content := rl.Rectangle {
+		rect.x + PANEL_PADDING,
+		rect.y + PANEL_HEADER + PANEL_PADDING,
+		rect.width - PANEL_PADDING * 2,
+		rect.height - PANEL_HEADER - PANEL_PADDING * 2,
+	}
+
+	Key :: struct {
+		label: string,
+		index: int,
+	}
 	keys := [16]Key {
 		{"1", 1}, {"2", 2}, {"3", 3}, {"C", 12},
 		{"4", 4}, {"5", 5}, {"6", 6}, {"D", 13},
-		{"7", 7}, {"8", 8}, {"9", 9}, {"D", 14},
-		{"A", 10}, {"0", 0}, {"B", 11}, {"F", 15}
+		{"7", 7}, {"8", 8}, {"9", 9}, {"E", 14},
+		{"A", 10}, {"0", 0}, {"B", 11}, {"F", 15},
 	}
 
-	btn_width := f32(rect.width / 4)
-	btn_height := f32(rect.height / 4)
+	btn_width := content.width / 4
+	btn_height := content.height / 4
 
 	for val, idx in keys {
 		str := strings.clone_to_cstring(val.label)
-		ri := int(idx / 4)
-		ci := idx % 4
+		defer delete(str)
 
-		irect := rl.Rectangle{
-			x = btn_width * f32(ci),
-			y = (btn_height * f32(ri)) + rect.y,
-			width = btn_width,
+		ri := idx / 4
+		ci := idx % 4
+		irect := rl.Rectangle {
+			x      = content.x + btn_width * f32(ci),
+			y      = content.y + btn_height * f32(ri),
+			width  = btn_width,
 			height = btn_height,
 		}
 
-		if(display[val.index]) { rl.DrawRectangleRec(irect, rl.DARKGRAY) }
-		rl.DrawRectangleLinesEx(irect, 1, rl.GRAY)
-		rl.DrawTextEx(font, str, rl.Vector2{irect.x + btn_width / 2, irect.y + btn_height / 2}, 18, 1, rl.WHITE)
+		if display[val.index] { rl.DrawRectangleRec(irect, rl.BLACK) }
 
-		// Free the allocations!
-		delete(str)
+		rl.DrawRectangleLinesEx(irect, 1, rl.GRAY)
+		rl.DrawTextEx( font, str,
+			rl.Vector2{irect.x + btn_width / 2, irect.y + btn_height / 2},
+			KEYPAD_FONT_SIZE,
+			1,
+			rl.WHITE,
+		)
 	}
 }