Added/updated components to be isolated rectangles.

src/simulator/gui_file_loader.odin

@@ -0,0 +1,77 @@
+package simulator
+
+import "core:log"
+import rl "vendor:raylib"
+
+import emu "../machine"
+import tfd "../../external/tinyfiledialogs"
+
+gui_file_loader :: proc(rect: rl.Rectangle, sim: ^Simulator) {
+	rl.DrawRectangleLinesEx(rect, 1, rl.GRAY)
+
+	bounds := rl.Rectangle {
+		x = rect.x + PADDING_X,
+		y = rect.y + PADDING_Y,
+		width = rect.width - (PADDING_X * 2),
+		height = rect.height - (PADDING_Y * 2),
+	}
+	rl.GuiPanel(bounds, "Rom / File")
+
+	// drop-zone occupies the panel's content area, minus space for the button
+	drop_zone := rl.Rectangle {
+		bounds.x + PADDING_X,
+		bounds.y + PADDING_Y,
+		bounds.width - (PADDING_X * 2),
+		bounds.height - ((PADDING_Y * 2) + (BUTTON_HEIGHT + PADDING_Y))
+	}
+
+	// centered drop-zone text
+	text: cstring = "Drop a CHIP-8 ROM here"
+	text_width := rl.MeasureText(text, BIG_FONT_SIZE)
+	text_x := drop_zone.x + (drop_zone.width - f32(text_width)) / 2
+	text_y := drop_zone.y + (drop_zone.height - f32(BIG_FONT_SIZE)) / 2
+	rl.DrawTextEx(sim.font, text, {text_x, text_y}, BIG_FONT_SIZE, 1, rl.WHITE)
+
+	// open rom button below drop-zone
+	btn_rect := rl.Rectangle {
+		drop_zone.x,
+		drop_zone.y + drop_zone.height + PADDING_Y,
+		drop_zone.width,
+		BUTTON_HEIGHT,
+	}
+
+	if rl.GuiButton(btn_rect, "Open ROM") {
+		ret := tfd.openFileDialog("Open File Dialog", nil, 0, nil, nil, 0,)
+		rom_path := string(ret)
+		if rom_path == "" do return
+
+		// reset machine state
+		emu.reset_machine(sim.machine)
+
+		// load new rom
+		err := emu.load_rom(sim.machine, rom_path)
+		if err != nil {
+			// @TODO: update status bar here
+			panic("failed to load rom!")
+		}
+
+		sim.rom_loaded = true
+	}
+
+	// Handle file drop
+	if rl.IsFileDropped() {
+		dropped_file := rl.LoadDroppedFiles()
+		if dropped_file.count > 0 {
+			mouse := rl.GetMousePosition()
+
+			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)
+	}
+}