From 77c11183c22d640939cd8a6a7588329a5879c64c Mon Sep 17 00:00:00 2001
From: Jack Jamison <jackqjamison@gmail.com>
Date: Sun, 26 Oct 2025 20:59:05 -0400
Subject: refactor to layout

---
 layout.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)

(limited to 'layout.c')

diff --git a/layout.c b/layout.c
index fb3ff4c..981210c 100644
--- a/layout.c
+++ b/layout.c
@@ -1,2 +1,98 @@
 #include "layout.h"
+#include "array.h"
+#include "config.h"
 
+void init_layout(client_state* state) {
+
+}
+
+void calculate_layout(client_state* state, rect_t* input, rect_t* options, bool recalc_options) {
+
+	// calculate input rect
+	*input = (rect_t){ .x = 0, .y = state->line_height * state->lines, .dx = state->width, .dy = state->line_height };
+	if (state->lines == 0 && array_size(state->filtered_items) != 0) {
+		input->dx = state->width / 3.0f;
+	}
+
+	// calculate options rect
+	*options = (rect_t){0};
+	if (state->lines) {
+		options->dx = state->width;
+		options->dy = input->y;
+	} else {
+		options->x = input->x + input->dx;
+		options->dx = state->width - options->x;
+		options->dy = state->line_height;
+	}
+
+	if (recalc_options) {
+
+		// calculate starting conditions
+		rect_t cur;
+		if (state->lines) {
+			cur = (rect_t){ .x = options->x, .y = input->y - state->line_height, .dx = options->dx, .dy = state->line_height };
+		} else {
+			cur = (rect_t){ .x = options->x, .y = options->y, .dx = 0.0f, .dy = state->line_height };
+		}
+
+		// calculate base filtered item rects
+		array_for_all(item_display_t, display, state->filtered_items) {
+			if (!state->lines) {
+				cur.dx = display->item->pixel_len + state->horizontal_spacing;
+			}
+
+			display->r = cur;
+
+			if (state->lines) {
+				cur.y -= state->line_height;
+			} else {
+				cur.x += cur.dx;
+			}
+		}
+
+		// calculate fancy scroll
+		if (fancy_scroll && array_size(state->filtered_items) != 0) {
+
+			// calculate if we should adjust scrolling
+			if (state->lines) {
+				// calc vertical scroll
+				float selected_bot = state->fancy_scroll + state->filtered_items[state->selected_filtered_item].r.y;
+				float selected_top = selected_bot + state->filtered_items[state->selected_filtered_item].r.dy;
+				if (selected_bot < options->y) {
+					state->fancy_scroll -= selected_bot;
+				}
+				float diff = selected_top - (options->y + options->dy);
+				if (diff > 0) {
+					state->fancy_scroll -= diff;
+				}
+			} else {
+				// calc horizontal scroll
+				item_display_t* selected = &state->filtered_items[state->selected_filtered_item];
+				float selected_left = state->fancy_scroll + selected->r.x;
+				float selected_right = selected_left + selected->r.dx;
+				float right_diff = selected_right - (options->x + options->dx);
+				float left_diff = selected_left - options->x;
+
+				if (selected->r.dx > options->dx) {
+					state->fancy_scroll -= left_diff;
+				}
+				else if (right_diff > 0) {
+					state->fancy_scroll -= right_diff;
+				}
+				else if (left_diff < 0) {
+					state->fancy_scroll -= left_diff;
+				}
+			}
+
+			// apply scroll offset
+			array_for_all(item_display_t, display, state->filtered_items) {
+				if (state->lines) {
+					display->r.y += state->fancy_scroll;
+				} else {
+					display->r.x += state->fancy_scroll;
+				}
+			}
+
+		}
+	}
+}
-- 
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