refactor sample list to separate list in project

src/app.zig

@@ -166,6 +166,23 @@ fn GenerationalArray(Item: type) type {
     };
 }
 
+pub const SampleList = struct {
+    samples: std.ArrayListUnmanaged(f64) = .{},
+    graph_min_max_cache: Graph.MinMaxCache = .{},
+    min_sample: ?f64 = null,
+    max_sample: ?f64 = null,
+
+    pub fn clear(self: *SampleList, allocator: Allocator) void {
+        self.deinit(allocator);
+        self.* = .{};
+    }
+
+    pub fn deinit(self: *SampleList, allocator: Allocator) void {
+        self.samples.clearAndFree(allocator);
+        self.graph_min_max_cache.deinit(allocator);
+    }
+};
+
 pub const Channel = struct {
     const Name = std.BoundedArray(u8, NIDaq.max_channel_name_size + 1);
     const Device = std.BoundedArray(u8, NIDaq.max_device_name_size + 1);
@@ -176,15 +193,12 @@ pub const Channel = struct {
 
     // Runtime
     device: Device = .{},
+    collected_samples_id: Id,
     allowed_sample_values: ?RangeF64 = null,
     allowed_sample_rates: ?RangeF64 = null,
-    // TODO: Use a linked list, so the whole list wouldn't need to be reallocated when appending collected samples
-    collected_samples: std.ArrayListUnmanaged(f64) = .{},
     write_pattern: std.ArrayListUnmanaged(f64) = .{},
     output_task: ?NIDaq.Task = null,
-    graph_min_max_cache: Graph.MinMaxCache = .{},
     last_sample_save_at: ?i128 = null,
-    processed_samples_up_to: usize = 0,
 
     pub fn deinit(self: *Channel, allocator: Allocator) void {
         self.clear(allocator);
@@ -200,14 +214,11 @@ pub const Channel = struct {
         self.allowed_sample_values = null;
         self.last_sample_save_at = null;
 
-        self.collected_samples.clearAndFree(allocator);
         self.write_pattern.clearAndFree(allocator);
         if (self.output_task) |task| {
             task.clear();
             self.output_task = null;
         }
-
-        self.graph_min_max_cache.deinit(allocator);
     }
 
     pub fn generateSine(
@@ -247,10 +258,6 @@ pub const Channel = struct {
     pub fn invalidateSavedSamples(self: *Channel) void {
         self.last_sample_save_at = null;
     }
-
-    fn hasNewCollectedSamples(self: *Channel) bool {
-        return self.processed_samples_up_to != self.collected_samples.items.len;
-    }
 };
 
 pub const File = struct {
@@ -258,24 +265,16 @@ pub const File = struct {
     path: []u8,
 
     // Runtime
-    samples: ?[]f64 = null,
+    samples_id: Id,
-    graph_min_max_cache: Graph.MinMaxCache = .{},
-    min_sample: f64 = 0,
-    max_sample: f64 = 0,
 
     pub fn deinit(self: *File, allocator: Allocator) void {
         self.clear(allocator);
-        self.graph_min_max_cache.deinit(allocator);
         allocator.free(self.path);
     }
 
     pub fn clear(self: *File, allocator: Allocator) void {
-        if (self.samples) |samples| {
+        _ = self;
-            allocator.free(samples);
+        _ = allocator;
-            self.samples = null;
-        }
-        self.min_sample = 0;
-        self.max_sample = 0;
     }
 };
 
@@ -373,12 +372,14 @@ pub const View = struct {
     graph_opts: Graph.ViewOptions = .{},
     sync_controls: bool = false,
     marked_ranges: std.BoundedArray(MarkedRange, 32) = .{},
+    sliding_window: ?f64 = null,
 
     // Runtime
     graph_cache: Graph.RenderCache = .{},
     available_x_range: RangeF64 = RangeF64.init(0, 0),
     available_y_range: RangeF64 = RangeF64.init(0, 0),
     unit: ?NIDaq.Unit = .Voltage,
+    transformed_samples: ?[]f64 = null,
 
     pub fn clear(self: *View) void {
         self.graph_cache.clear();
@@ -431,6 +432,7 @@ pub const Project = struct {
     // TODO: How this to computer local settings, like appdata. Because this option shouldn't be project specific.
     show_rulers: bool = true,
 
+    sample_lists: GenerationalArray(SampleList) = .{},
     channels: GenerationalArray(Channel) = .{},
     files: GenerationalArray(File) = .{},
     views: GenerationalArray(View) = .{},
@@ -467,23 +469,88 @@ pub const Project = struct {
         return result_range;
     }
 
-    pub fn getViewSamples(self: *Project, view_id: Id) []const f64 {
+    pub fn getViewSampleList(self: *Project, view_id: Id) Id {
-        const empty = &[0]f64{};
+        const view = self.views.get(view_id).?;
 
-        var result: []const f64 = empty;
-
-        if (self.views.get(view_id)) |view| {
         switch (view.reference) {
-                .channel => |channel_id| if (self.channels.get(channel_id)) |channel| {
+            .channel => |channel_id| {
-                    result = channel.collected_samples.items;
+                const channel = self.channels.get(channel_id).?;
+                return channel.collected_samples_id;
             },
-                .file => |file_id| if (self.files.get(file_id)) |file| {
+            .file => |file_id| {
-                    result = file.samples orelse empty;
+                const file = self.files.get(file_id).?;
+                return file.samples_id;
             }
         }
     }
 
-        return result;
+    pub fn getViewSamples(self: *Project, view_id: Id) []const f64 {
+        const samples_list_id = self.getViewSampleList(view_id);
+        const samples_list = self.sample_lists.get(samples_list_id).?;
+
+        return samples_list.samples.items;
+    }
+
+    pub fn appendSamples(self: *Project, allocator: Allocator, sample_list_id: Id, samples: []const f64) !void {
+        if (samples.len == 0) return;
+
+        const sample_list = self.sample_lists.get(sample_list_id).?;
+
+        const affected_range = RangeF64.init(
+            @floatFromInt(sample_list.samples.items.len),
+            @floatFromInt(sample_list.samples.items.len + samples.len)
+        );
+
+        try sample_list.samples.appendSlice(allocator, samples);
+
+        var min_sample = sample_list.min_sample orelse samples[0];
+        var max_sample = sample_list.max_sample orelse samples[0];
+        for (samples) |sample| {
+            min_sample = @min(min_sample, sample);
+            max_sample = @max(max_sample, sample);
+        }
+        sample_list.min_sample = min_sample;
+        sample_list.max_sample = max_sample;
+
+        try sample_list.graph_min_max_cache.updateLast(allocator, sample_list.samples.items);
+
+        self.refreshMarkedRanges(sample_list_id, affected_range);
+    }
+
+    pub fn clearSamples(self: *Project, allocator: Allocator, sample_list_id: Id) void {
+        const sample_list = self.sample_lists.get(sample_list_id).?;
+
+        const affected_range = RangeF64.init(
+            0,
+            @floatFromInt(sample_list.samples.items.len)
+        );
+
+        sample_list.clear(allocator);
+
+        self.refreshMarkedRanges(sample_list_id, affected_range);
+    }
+
+    fn refreshMarkedRanges(self: *Project, sample_list_id: Id, affected_range: RangeF64) void {
+        const sample_list = self.sample_lists.get(sample_list_id).?;
+        const total_samples = sample_list.samples.items;
+
+        var view_iter = self.views.idIterator();
+        while (view_iter.next()) |view_id| {
+            const view_sample_list_id = self.getViewSampleList(view_id);
+            if (!view_sample_list_id.eql(sample_list_id)) {
+                continue;
+            }
+
+            const view = self.views.get(view_id).?;
+            const marked_ranges: []View.MarkedRange = view.marked_ranges.slice();
+            for (marked_ranges) |*marked_range| {
+                if (marked_range.axis != .X) continue;
+
+                if (affected_range.intersectPositive(marked_range.range).isPositive()) {
+                    marked_range.refresh(total_samples);
+                }
+            }
+        }
     }
 
     pub fn deinit(self: *Project, allocator: Allocator) void {
@@ -501,6 +568,12 @@ pub const Project = struct {
 
         self.views.clear();
 
+        var sample_lists_iter = self.sample_lists.iterator();
+        while (sample_lists_iter.next()) |sample_list| {
+            sample_list.clear(allocator);
+        }
+        self.sample_lists.clear();
+
         if (self.save_location) |str| {
             allocator.free(str);
             self.save_location = null;
@@ -548,10 +621,14 @@ pub const Project = struct {
                 }
                 errdefer if (saved_collected_samples) |str| allocator.free(str);
 
+                const sample_list_id = try self.sample_lists.insert(.{});
+                errdefer self.sample_lists.remove(sample_list_id);
+
                 const channel = self.channels.get(id).?;
                 channel.* = Channel{
                     .name = try utils.initBoundedStringZ(Channel.Name, channel_name),
-                    .saved_collected_samples = saved_collected_samples
+                    .saved_collected_samples = saved_collected_samples,
+                    .collected_samples_id = sample_list_id
                 };
             }
         }
@@ -566,9 +643,13 @@ pub const Project = struct {
                 const path = try readString(reader, allocator);
                 errdefer allocator.free(path);
 
+                const sample_list_id = try self.sample_lists.insert(.{});
+                errdefer self.sample_lists.remove(sample_list_id);
+
                 const file = self.files.get(id).?;
                 file.* = File{
-                    .path = path
+                    .path = path,
+                    .samples_id = sample_list_id
                 };
             }
         }
@@ -654,7 +735,8 @@ pub const Project = struct {
                             const samples_file = try dir.createFile(path, .{});
                             defer samples_file.close();
 
-                            try writeFileF64(samples_file, channel.collected_samples.items);
+                            const samples = self.sample_lists.get(channel.collected_samples_id).?.samples.items;
+                            try writeFileF64(samples_file, samples);
                         }
 
                         const stat = try dir.statFile(path);
@@ -848,7 +930,7 @@ pub fn init(self: *App, allocator: Allocator) !void {
         self.ni_daq = try NIDaq.init(allocator, &self.ni_daq_api.?, .{
             .max_devices = 4,
             .max_analog_inputs = 32,
-            .max_analog_outputs = 8,
+            .max_analog_outputs = 16,
             .max_counter_outputs = 8,
             .max_counter_inputs = 8,
             .max_analog_input_voltage_ranges = 4,
@@ -1012,42 +1094,6 @@ pub fn tick(self: *App) !void {
         self.collection_samples_mutex.lock();
         defer self.collection_samples_mutex.unlock();
 
-        {
-            var view_iter = self.project.views.idIterator();
-            while (view_iter.next()) |id| {
-                const view = self.getView(id) orelse continue;
-                if (view.reference != .channel) continue;
-
-                const channel_id = view.reference.channel;
-                const channel = self.getChannel(channel_id) orelse continue;
-                if (!channel.hasNewCollectedSamples()) continue;
-
-                const samples = channel.collected_samples.items;
-
-                const new_samples_range = RangeF64.init(@floatFromInt(channel.processed_samples_up_to), @floatFromInt(samples.len));
-                const marked_ranges: []View.MarkedRange = view.marked_ranges.slice();
-                for (marked_ranges) |*marked_range| {
-                    if (marked_range.axis != .X) continue;
-
-                    if (new_samples_range.intersectPositive(marked_range.range).isPositive()) {
-                        marked_range.refresh(samples);
-                    }
-                }
-            }
-        }
-
-        // Update channel min max caches
-        {
-            var channel_iter = self.project.channels.iterator();
-            while (channel_iter.next()) |channel| {
-                if (channel.hasNewCollectedSamples()) {
-                    channel.invalidateSavedSamples();
-                    try channel.graph_min_max_cache.updateLast(self.allocator, channel.collected_samples.items);
-                    channel.processed_samples_up_to = channel.collected_samples.items.len;
-                }
-            }
-        }
-
         {
             var view_iter = self.project.views.idIterator();
             while (view_iter.next()) |id| {
@@ -1199,7 +1245,7 @@ fn startCollection(self: *App) !void {
 
     for (channels_in_task.constSlice()) |id| {
         const channel = self.getChannel(id).?;
-        channel.collected_samples.clearAndFree(self.allocator);
+        self.project.clearSamples(self.allocator, channel.collected_samples_id);
     }
 
     const read_array = try self.allocator.alloc(f64,
@@ -1345,7 +1391,7 @@ pub fn collectionThreadCallback(self: *App) void {
                         const channel_id = collection_task.channels.get(channel_index);
                         const channel = self.getChannel(channel_id) orelse continue;
 
-                        channel.collected_samples.appendSlice(self.allocator, channel_samples) catch |e| {
+                        self.project.appendSamples(self.allocator, channel.collected_samples_id, channel_samples) catch |e| {
                             log.err("Failed to append samples for channel: {}", .{e});
                             continue;
                         };
@@ -1374,9 +1420,13 @@ pub fn addFile(self: *App, path: []const u8) !Id {
     const path_dupe = try self.allocator.dupe(u8, path);
     errdefer self.allocator.free(path_dupe);
 
+    const sample_list_id = try self.project.sample_lists.insert(.{});
+    errdefer self.project.sample_lists.remove(sample_list_id);
+
     const file = self.project.files.get(id).?;
     file.* = File{
-        .path = path_dupe
+        .path = path_dupe,
+        .samples_id = sample_list_id
     };
 
     self.loadFile(id) catch |e| {
@@ -1423,7 +1473,10 @@ fn writeFileF64(file: std.fs.File, data: []const f64) !void {
 
 pub fn loadFile(self: *App, id: Id) !void {
     const file = self.getFile(id) orelse return;
+    const sample_list = self.project.sample_lists.get(file.samples_id) orelse return;
+
     file.clear(self.allocator);
+    sample_list.clear(self.allocator);
 
     const cwd = std.fs.cwd();
 
@@ -1431,18 +1484,9 @@ pub fn loadFile(self: *App, id: Id) !void {
     defer samples_file.close();
 
     const samples = try readFileF64(self.allocator, samples_file);
-    file.samples = samples;
+    defer self.allocator.free(samples);
 
-    if (samples.len > 0) {
+    try self.project.appendSamples(self.allocator, file.samples_id, samples);
-        file.min_sample = samples[0];
-        file.max_sample = samples[0];
-        for (samples) |sample| {
-            file.min_sample = @min(file.min_sample, sample);
-            file.max_sample = @max(file.max_sample, sample);
-        }
-
-        try file.graph_min_max_cache.updateAll(self.allocator, samples);
-    }
 }
 
 // ---------------- Channels --------------------------------- //
@@ -1455,9 +1499,13 @@ pub fn addChannel(self: *App, channel_name: []const u8) !Id {
     const id = try self.project.channels.insertUndefined();
     errdefer self.project.channels.remove(id);
 
+    const sample_list_id = try self.project.sample_lists.insert(.{});
+    errdefer self.project.sample_lists.remove(sample_list_id);
+
     const channel = self.project.channels.get(id).?;
     channel.* = Channel{
         .name = try utils.initBoundedStringZ(Channel.Name, channel_name),
+        .collected_samples_id = sample_list_id
     };
 
     if (self.project.save_location) |project_file_path| {
@@ -1527,7 +1575,9 @@ fn loadSavedSamples(self: *App, channel_id: Id) !void {
     defer samples_file.close();
 
     const samples = try readFileF64(self.allocator, samples_file);
-    channel.collected_samples = std.ArrayListUnmanaged(f64).fromOwnedSlice(samples);
+    defer self.allocator.free(samples);
+
+    try self.project.appendSamples(self.allocator, channel.collected_samples_id, samples);
 
     const stat = try dir.statFile(saved_samples_location);
     channel.last_sample_save_at = stat.mtime;
@@ -1601,36 +1651,29 @@ pub fn getViewSamples(self: *App, id: Id) []const f64 {
 }
 
 pub fn getViewMinMaxCache(self: *App, id: Id) Graph.MinMaxCache {
-    const view = self.getView(id).?;
+    const samples_list_id = self.project.getViewSampleList(id);
+    const sample_list = self.project.sample_lists.get(samples_list_id).?;
 
-    switch (view.reference) {
+    return sample_list.graph_min_max_cache;
-        .channel => |channel_id| {
-            const channel = self.getChannel(channel_id).?;
-            return channel.graph_min_max_cache;
-        },
-        .file => |file_id| {
-            const file = self.getFile(file_id).?;
-            return file.graph_min_max_cache;
-        }
-    }
 }
 
 fn refreshViewAvailableXYRanges(self: *App, id: Id) void {
     const view = self.getView(id) orelse return;
+    const sample_list_id = self.project.getViewSampleList(id);
+    const sample_list = self.project.sample_lists.get(sample_list_id).?;
+
+    view.available_x_range = RangeF64.init(0, @floatFromInt(sample_list.samples.items.len));
 
     switch (view.reference) {
         .channel => |channel_id| if (self.getChannel(channel_id)) |channel| {
             const allowed_sample_values = channel.allowed_sample_values orelse RangeF64.init(0, 0);
-            const samples = channel.collected_samples.items;
 
-            view.available_x_range = RangeF64.init(0, @floatFromInt(samples.len));
             view.available_y_range = RangeF64.init(allowed_sample_values.upper, allowed_sample_values.lower);
         },
-        .file => |file_id| if (self.getFile(file_id)) |file| {
+        .file => {
-            const samples = file.samples orelse &[_]f64{ };
+            const min_sample = sample_list.min_sample orelse 0;
-
+            const max_sample = sample_list.max_sample orelse 1;
-            view.available_x_range = RangeF64.init(0, @floatFromInt(samples.len));
+            view.available_y_range = RangeF64.init(max_sample, min_sample);
-            view.available_y_range = RangeF64.init(file.max_sample, file.min_sample);
         }
     }
 }

src/components/view.zig

@@ -240,11 +240,20 @@ fn showToolbar(ctx: Context, view_id: Id) void {
             .size_x = UI.Sizing.initGrowFull()
         });
 
+        _ = ui.createBox(.{
+            .size_x = UI.Sizing.initFixedPixels(ui.rem(1))
+        });
+
         const label = ui.label("{s}", .{text});
         label.size.y = UI.Sizing.initGrowFull();
         label.alignment.x = .center;
         label.alignment.y = .center;
-        label.padding = UI.Padding.horizontal(ui.rem(1));
+        // TODO:
+        // label.padding = UI.Padding.horizontal(ui.rem(1));
+
+        _ = ui.createBox(.{
+            .size_x = UI.Sizing.initFixedPixels(ui.rem(1))
+        });
     }
 }
 

src/graph.zig

@@ -191,6 +191,50 @@ pub const RenderCache = struct {
     }
 };
 
+pub const SampleIterator = struct {
+    samples: []const f64,
+    to: f64,
+    step: f64,
+    i: f64,
+    next_i: f64,
+
+    pub fn init(samples: []const f64, from: f64, to: f64, step: f64) SampleIterator {
+        return SampleIterator{
+            .samples = samples,
+            .i = from,
+            .next_i = from + step,
+            .to = to,
+            .step = step
+        };
+    }
+
+    pub fn initRange(samples: []const f64, range: RangeF64, step: f64) SampleIterator {
+        return SampleIterator.init(samples, range.lower, range.upper, step);
+    }
+
+    pub fn next(self: *SampleIterator) ?[]const f64 {
+        if (self.next_i < self.to) {
+            self.i = self.next_i;
+            self.next_i = self.i + self.step;
+
+            const i_usize: usize = @intFromFloat(self.i);
+            const next_i_usize: usize = @intFromFloat(self.next_i);
+            if (next_i_usize >= self.samples.len) {
+                return null;
+            }
+
+            const samples = self.samples[i_usize..next_i_usize];
+            if (samples.len == 0) {
+                return null;
+            }
+
+            return samples;
+        } else {
+            return null;
+        }
+    }
+};
+
 fn drawSamplesExact(draw_rect: rl.Rectangle, options: ViewOptions, samples: []const f64) void {
     rl.beginScissorMode(
         @intFromFloat(draw_rect.x),
@@ -241,20 +285,15 @@ fn drawSamplesApproximate(draw_rect: rl.Rectangle, options: ViewOptions, samples
     const i_range = options.x_range.intersectPositive(
         RangeF64.init(0, @max(@as(f64, @floatFromInt(samples.len)) - 1, 0))
     );
-    if (i_range.lower > i_range.upper) {
+    if (i_range.isNegative()) {
         return;
     }
 
     const samples_per_column = options.x_range.size() / draw_x_range.size();
     assert(samples_per_column >= 1);
 
-    var i = i_range.lower;
+    var iter = SampleIterator.init(samples, i_range.lower, i_range.upper, samples_per_column);
-    while (i < i_range.upper - samples_per_column) : (i += samples_per_column) {
+    while (iter.next()) |column_samples| {
-        const column_start: usize = @intFromFloat(i);
-        const column_end: usize = @intFromFloat(i + samples_per_column);
-        const column_samples = samples[column_start..column_end];
-        if (column_samples.len == 0) continue;
-
         var column_min = column_samples[0];
         var column_max = column_samples[0];
 
@@ -263,7 +302,7 @@ fn drawSamplesApproximate(draw_rect: rl.Rectangle, options: ViewOptions, samples
             column_max = @max(column_max, sample);
         }
 
-        const x = options.x_range.remapTo(draw_x_range, i);
+        const x = options.x_range.remapTo(draw_x_range, iter.i);
         const y_min = options.y_range.remapTo(draw_y_range, column_min);
         const y_max = options.y_range.remapTo(draw_y_range, column_max);
 
@@ -290,7 +329,7 @@ fn drawSamplesMinMax(draw_rect: rl.Rectangle, options: ViewOptions, min_max_cach
     const i_range = options.x_range.intersectPositive(
         RangeF64.init(0, @max(@as(f64, @floatFromInt(min_max_cache.sample_count)) - 1, 0))
     );
-    if (i_range.lower > i_range.upper) {
+    if (i_range.isNegative()) {
         return;
     }
 

src/main.zig

@@ -112,29 +112,29 @@ pub fn main() !void {
         app.project.save_location = save_location;
         app.project.sample_rate = 5000;
 
-        _ = try app.addView(.{
+        // _ = try app.addView(.{
-            .channel = try app.addChannel("Dev1/ai0")
+        //     .channel = try app.addChannel("Dev1/ai0")
-        });
+        // });
 
-        _ = try app.addView(.{
+        // _ = try app.addView(.{
-            .file = try app.addFile("./samples-5k.bin")
+        //     .file = try app.addFile("./samples-5k.bin")
-        });
+        // });
 
-        _ = try app.addView(.{
+        // _ = try app.addView(.{
-            .file = try app.addFile("./samples-50k.bin")
+        //     .file = try app.addFile("./samples-50k.bin")
-        });
+        // });
 
-        _ = try app.addView(.{
+        // _ = try app.addView(.{
-            .file = try app.addFile("./samples-300k.bin")
+        //     .file = try app.addFile("./samples-300k.bin")
-        });
+        // });
 
-        _ = try app.addView(.{
+        // _ = try app.addView(.{
-            .file = try app.addFile("./samples-9m.bin")
+        //     .file = try app.addFile("./samples-9m.bin")
-        });
+        // });
 
-        _ = try app.addView(.{
+        // _ = try app.addView(.{
-            .file = try app.addFile("./samples-18m.bin")
+        //     .file = try app.addFile("./samples-18m.bin")
-        });
+        // });
     }
 
     var profiler: ?Profiler = null;

src/screens/main_screen.zig

@@ -36,6 +36,7 @@ sample_rate_input: UI.TextInputStorage,
 parsed_sample_rate: ?f64 = null,
 
 // View settings
+sliding_window_input: UI.TextInputStorage,
 channel_save_file_picker: ?Platform.FilePickerId = null,
 file_save_file_picker: ?Platform.FilePickerId = null,
 
@@ -47,7 +48,8 @@ pub fn init(app: *App) !MainScreen {
         .frequency_input = UI.TextInputStorage.init(allocator),
         .amplitude_input = UI.TextInputStorage.init(allocator),
         .sample_rate_input = UI.TextInputStorage.init(allocator),
-        .view_controls = ViewControlsSystem.init(&app.project)
+        .view_controls = ViewControlsSystem.init(&app.project),
+        .sliding_window_input = UI.TextInputStorage.init(allocator)
     };
 
     try self.frequency_input.setText("10");
@@ -317,13 +319,13 @@ fn showViewSettings(self: *MainScreen, view_id: Id) !void {
         .label = "Sync controls"
     });
 
-    var sample_count: ?usize = null;
+    const samples = project.getViewSamples(view_id);
+
     switch (view.reference) {
         .channel => |channel_id| {
             const channel = project.channels.get(channel_id).?;
             const channel_name = utils.getBoundedStringZ(&channel.name);
             const channel_type = NIDaq.getChannelType(channel_name);
-            const samples = channel.collected_samples.items;
 
             _ = ui.label("Channel: {s}", .{ channel_name });
 
@@ -346,16 +348,10 @@ fn showViewSettings(self: *MainScreen, view_id: Id) !void {
 
                 channel.saved_collected_samples = path;
             }
-
-            sample_count = samples.len;
         },
         .file => |file_id| {
             const file = project.files.get(file_id).?;
 
-            if (file.samples) |samples| {
-                sample_count = samples.len;
-            }
-
             if (ui.fileInput(.{
                 .key = ui.keyFromString("Filename"),
                 .allocator = self.app.allocator,
@@ -370,18 +366,21 @@ fn showViewSettings(self: *MainScreen, view_id: Id) !void {
 
     }
 
-    if (sample_count != null) {
+    _ = ui.label("Samples: {d}", .{ samples.len });
-        _ = ui.label("Samples: {d}", .{ sample_count.? });
 
     var duration_str: []const u8 = "-";
     if (sample_rate != null) {
-            const duration = @as(f64, @floatFromInt(sample_count.?)) / sample_rate.?;
+        const duration = @as(f64, @floatFromInt(samples.len)) / sample_rate.?;
         if (utils.formatDuration(ui.frameAllocator(), duration)) |str| {
             duration_str = str;
         } else |_| {}
     }
     _ = ui.label("Duration: {s}", .{ duration_str });
-    }
+
+    _ = try ui.numberInput(f64, .{
+        .key = ui.keyFromString("Sliding window"),
+        .storage = &self.sliding_window_input
+    });
 }
 
 fn showMarkedRange(self: *MainScreen, view_id: Id, index: usize) void {