chore(control): add settings with screenshot preview settings

control/frontend/src/lib/components/NumberSettingInput.svelte

@@ -0,0 +1,66 @@
+<script lang="ts">
+	import type { NumberSetting } from '$lib/ts/types';
+	import { ChevronDown, ChevronUp, Minus, Plus } from 'lucide-svelte';
+	import Button from './Button.svelte';
+
+	let {
+		number_setting,
+		on_change,
+		className = '',
+        disabled = false,
+	}: {
+		number_setting: NumberSetting;
+		on_change: (new_value: number) => void;
+		className?: string;
+        disabled?: boolean;
+	} = $props();
+
+	let el: HTMLInputElement | null = null;
+
+	function increase() {
+        if (!el) return;
+		el.stepUp();
+		el.dispatchEvent(new Event('input', { bubbles: true }));
+		on_change(Number(el.value));
+	}
+
+	function decrease() {
+        if (!el) return;
+		el.stepDown();
+		el.dispatchEvent(new Event('input', { bubbles: true }));
+        on_change(Number(el.value));
+	}
+
+    function on_blur() {
+        if (!el) return;
+        let value = Number(el.value);
+        if (value > number_setting.max) value = number_setting.max;
+        else if (value < number_setting.min) value = number_setting.min;
+        el.value = String(value);
+        on_change(value);
+    }
+</script>
+
+<div class="flex flex-row {className}">
+	<Button click_function={increase} className="rounded-r-none" disabled={disabled}>
+        <ChevronUp />
+    </Button>
+	<input
+        bind:this={el}
+		class="bg-stone-700 focus:bg-stone-550 focus:outline-none transition-colors duration-200 py-2 px-4 w-15 text-center
+        {disabled ? 'text-stone-500 cursor-not-allowed' : 'hover:bg-stone-600'}
+        [appearance:textfield]
+        [&::-webkit-outer-spin-button]:appearance-none
+        [&::-webkit-inner-spin-button]:appearance-none"
+		type="number"
+        disabled={disabled}
+		max={number_setting.max}
+		min={number_setting.min}
+		value={number_setting.now}
+		step={number_setting.step}
+        onblur={on_blur}
+	/>
+    <Button click_function={decrease} className="rounded-l-none" disabled={disabled}>
+        <ChevronDown />
+    </Button>
+</div>

control/frontend/src/lib/ts/stores/displays.ts

@@ -13,6 +13,7 @@ import { delete_and_deselect_unique_files_from_display } from './files';
 import { db } from '../database';
 import { dev } from '$app/environment';
 import { remove_display_from_loading_displays } from '../main';
+import { preview_settings } from './ui_behavior';
 
 export const local_displays: Writable<DisplayIdGroup[]> = writable<DisplayIdGroup[]>([]);
 
@@ -117,7 +118,13 @@ export async function get_display_by_id(display_id: string): Promise<Display | n
 	return (await db.displays.get(display_id)) ?? null;
 }
 
-export async function screenshot_loop(display_id: string, initial_retry_count: number = 5) {
+export async function screenshot_loop(display_id: string) {
+	const settings = get(preview_settings);
+	if (settings.mode === 'never') return;
+
+	const initial_retry_count = settings.retry_count.now;
+	const retry_seconds = get(preview_settings).retry_seconds.now;
+
 	const display = await db.displays.get(display_id);
 	if (!display || display.preview.currently_updating) return;
 
@@ -128,7 +135,7 @@ export async function screenshot_loop(display_id: string, initial_retry_count: n
 
 	let retry_count = initial_retry_count;
 	while (retry_count > 0) {
-		retry_count -= 1;
+		if (settings.mode !== 'always') retry_count -= 1;
 
 		const new_blob = await get_screenshot(display.ip);
 		if (!new_blob) {
@@ -149,7 +156,7 @@ export async function screenshot_loop(display_id: string, initial_retry_count: n
 			retry_count = initial_retry_count;
 		}
 
-		await new Promise((resolve) => setTimeout(resolve, 2000)); // sleep 2s
+		await new Promise((resolve) => setTimeout(resolve, retry_seconds * 1000)); // sleep
 	}
 
 	display.preview.currently_updating = false;

control/frontend/src/lib/ts/stores/ui_behavior.ts

@@ -1,4 +1,5 @@
 import { writable, type Writable } from 'svelte/store';
+import type { NumberSetting } from '../types';
 
 export const dnd_flip_duration_ms = 300;
 
@@ -23,6 +24,30 @@ export const current_height: Writable<Record<string, number>> = writable<Record<
 export const is_group_drag: Writable<boolean> = writable<boolean>(false);
 export const is_display_drag: Writable<boolean> = writable<boolean>(false);
 
+export const preview_settings: Writable<{
+	mode: 'never' | 'normal' | 'always';
+	retry_seconds: NumberSetting;
+	retry_count: NumberSetting;
+}> = writable<{
+	mode: 'never' | 'normal' | 'always';
+	retry_seconds: NumberSetting;
+	retry_count: NumberSetting;
+}>({
+	mode: 'normal',
+	retry_seconds: {
+		max: 10,
+		min: 0.5,
+		now: 2,
+		step: 0.5
+	},
+	retry_count: {
+		max: 10,
+		min: 1,
+		now: 5,
+		step: 1
+	}
+});
+
 export const pinned_display_id: Writable<string | null> = writable<string | null>(null);
 
 export function change_height(key: 'display' | 'file', factor: number) {

control/frontend/src/lib/ts/types.ts

@@ -141,6 +141,13 @@ export type PopupContent = {
 	closable?: boolean;
 };
 
+export type NumberSetting = {
+	max: number,
+	min: number,
+	now: number,
+	step: number
+}
+
 export type DisplayStatus = 'host_offline' | 'app_offline' | 'app_online' | null;
 
 export function to_display_status(value: string): DisplayStatus {