added basic keyframe UI

src/app.rs

@@ -17,7 +17,8 @@ pub struct System {
     pub font_size: f32
 }
 
-pub fn init(title: &str, size: (f64, f64)) -> System {
+impl System {
+    pub fn init(title: &str, size: (f64, f64)) -> System {
         let event_loop = EventLoop::new();
         let context = glutin::ContextBuilder::new().with_vsync(true);
         let builder = WindowBuilder::new()
@@ -73,9 +74,8 @@ pub fn init(title: &str, size: (f64, f64)) -> System {
             renderer,
             font_size
         }
-}
+    }
 
-impl System {
     pub fn main_loop<F: FnMut(&mut bool, &mut Ui, &Display) + 'static>(self, mut run_ui: F) {
         let System {
             event_loop,

src/drag_area.rs

@@ -12,14 +12,11 @@ pub struct DragArea {
     pub offset: [f32; 2],
     pub size: [f32; 2],
     pub border_color: ImColor32,
-    default_offset: [f32; 2],
+    pub default_offset: [f32; 2],
     default_size: [f32; 2]
 }
 
-pub fn init(
-    offset: [f32; 2],
-    size: [f32; 2]
-) -> DragArea {
+pub fn init(offset: [f32; 2], size: [f32; 2]) -> DragArea {
     DragArea {
         offset,
         size,

src/main.rs

@@ -1,61 +1,42 @@
 use glium::glutin::dpi::LogicalSize;
-use imgui::*;
-use imgui::color::ImColor32;
+//use glium::glutin::window::Window as GlutinWindow;
+//use imgui::Ui;
 
 mod app;
-mod drag_area;
+use app::System;
+
+mod storage;
+use storage::Storage;
+
+mod main_window;
+use main_window::MainWindow;
+
+mod ui_generic;
 
 const INIT_SIZE: (f64, f64) = (640.0, 480.0);
 const MIN_SIZE: (f64, f64) = (300.0, 250.0);
 
-
 fn main() {
-    let main_app = app::init("muh window", INIT_SIZE);
+    let main_app = System::init("muh window", INIT_SIZE);
 
     main_app.display
         .gl_window()
         .window()
         .set_min_inner_size(Some(LogicalSize::new(MIN_SIZE.0, MIN_SIZE.1)));
 
-    let mut main_drag_area = drag_area::init(
-        [30.0, 30.0],
-        [200.0, 200.0]
-    );
+    let mut main_window = MainWindow::init();
 
-    main_app.main_loop(move |_, ui, display| {
-        Window::new("Node Editor")
-            .size([300.0, 110.0], Condition::FirstUseEver)
-            .build(&ui, || {
-                ui.text("Basic Drag Area");
-                ui.separator();
-
-                main_drag_area.build(
-                    &ui,
-                    &display.gl_window().window(),
-                    move |draw_list, area_min, area_max, offset| {
-                        let text_pos: [f32; 2] = [
-                            area_min[0] + offset[0],
-                            area_min[1] + offset[1]
+    let win_size = main_app.display.gl_window().window().inner_size();
+    main_window.size = [
+        win_size.width as f32,
+        300.0
     ];
 
-                        draw_list.add_text(
-                            text_pos,
-                            ImColor32::WHITE,
-                            "Basic Drag Area Contents"
-                        );
-                    }
-                );
+    let mut main_storage = Storage::init();
 
-                draw_mouse_pos_text(ui);
-            });
-    });
-}
-
-fn draw_mouse_pos_text(ui: &Ui) {
-    let mouse_pos = ui.io().mouse_pos;
+    main_storage.add_bpm_change(0, 120);
 
-    ui.text(format!(
-        "mouse pos: ({:.1}, {:.1})",
-        mouse_pos[0], mouse_pos[1]
-    ));
+    main_app.main_loop(move |_, ui, display| {
+        main_window.build(ui, display, &mut main_storage);
+    });
 }

src/main_window.rs

@@ -0,0 +1,112 @@
+//use glium::glutin::window::Window as GlutinWindow;
+use glium::Display;
+use imgui::{Window, Ui, Condition};
+
+use crate::ui_generic::drag_area::DragArea;
+use crate::ui_generic::keyframe_editor::KeyframeEditor;
+use crate::storage::Storage;
+
+const DRAG_AREA_MIN_SIZE: [f32; 2] = [300.0, 300.0];
+
+const WIN_SIZE: [f32; 2] = [
+    DRAG_AREA_MIN_SIZE[0] + 15.0,
+    DRAG_AREA_MIN_SIZE[1] + 100.0
+];
+
+const WIN_MIN_SIZE: [f32; 2] = WIN_SIZE;
+
+pub struct MainWindow {
+    pub size: [f32; 2],
+    default_size: [f32; 2],
+    min_size: [f32; 2],
+    editor: KeyframeEditor,
+    string_buf: String
+}
+
+impl MainWindow {
+    pub fn init() -> MainWindow {
+        MainWindow {
+            size: WIN_SIZE,
+            default_size: WIN_SIZE,
+            min_size: WIN_MIN_SIZE,
+            editor: KeyframeEditor::new(DRAG_AREA_MIN_SIZE),
+            string_buf: String::new()
+        }
+    }
+
+    pub fn build(
+        &mut self,
+        ui: &Ui,
+        display: &Display,
+        storage: &mut Storage
+    ) {
+        Window::new("Main Window")
+            .size(self.size, Condition::FirstUseEver)
+            .size_constraints(self.min_size, [1000.0, 1000.0])
+            .build(&ui, || {
+                MainWindow::build_window_contents(
+                    self,
+                    ui,
+                    display,
+                    storage
+                )
+            });
+    }
+    
+    fn build_window_contents(
+        self: &mut MainWindow,
+        ui: &Ui,
+        display: &Display,
+        storage: &mut Storage
+    ) {
+        let win_size = ui.window_size();
+
+        self.editor.drag_area.size = [
+            win_size[0] - 20.0,
+            win_size[1] - 100.0
+        ];
+
+        ui.same_line();
+        let dec_bpm = ui.button("-");
+
+        ui.same_line();
+        ui.text(format!("{} bpm", storage.initial_bpm()));
+
+        ui.same_line();
+        let inc_bpm = ui.button("+");
+
+        if dec_bpm { storage.bpm_changes[0].bpm -= 1; }
+        if inc_bpm { storage.bpm_changes[0].bpm += 1; }
+
+        ui.same_line();
+        let kf_name_input = ui
+            .input_text("", &mut self.string_buf)
+            .hint(format!(
+                "name new keyframe channel · {} in current project",
+                storage.keyframe_channels.len()
+            ))
+            .enter_returns_true(true)
+            .build();
+
+        ui.same_line();
+        let add_kf_chan = ui.button("add keyframe channel");
+
+        if (kf_name_input || add_kf_chan) && !self.string_buf.is_empty() {
+            storage.add_keyframe_channel(String::from(&self.string_buf));
+            self.string_buf.clear();
+        }
+
+        ui.separator();
+
+        self.editor.build(ui, display, storage);
+        draw_mouse_pos_text(ui);
+    }
+}
+
+fn draw_mouse_pos_text(ui: &Ui) {
+    let mouse_pos = ui.io().mouse_pos;
+    ui.text(format!(
+        "mouse pos: ({:.1}, {:.1})",
+        mouse_pos[0], mouse_pos[1]
+    ));
+}

src/storage.rs

@@ -0,0 +1,133 @@
+#[allow(dead_code)]
+pub struct Storage {
+    // TODO: add custom timestamp class which can be queried by
+    // beats/measures/etc.
+    pub timestamp: u64,
+    pub playback_mode: PlaybackMode,
+    pub bpm_changes: Vec<BpmChange>,
+    pub time_changes: Vec<TimeChange>,
+    pub keyframe_channels: Vec<KeyframeChannel>
+}
+
+pub enum PlaybackMode {
+    Playing,
+    Stopped,
+    Paused
+}
+
+pub struct BpmChange {
+    pub timestamp: u64,
+    pub bpm: u32
+}
+
+pub struct TimeChange {
+    pub timestamp: u64,
+    pub time: (u8, u8)
+}
+
+pub struct KeyframeChannel {
+    pub name: String,
+    pub enabled: bool,
+    pub keyframes: Vec<Keyframe>
+}
+
+pub enum KeyframeType {
+    Tick
+}
+
+pub struct Keyframe {
+    pub kf_type: KeyframeType,
+    pub timestamp: u64
+}
+
+impl Storage {
+    pub fn init() -> Storage {
+        Storage {
+            timestamp: 0,
+            playback_mode: PlaybackMode::Stopped,
+            bpm_changes: Vec::<BpmChange>::new(),
+            time_changes: Vec::<TimeChange>::new(),
+            keyframe_channels: Vec::<KeyframeChannel>::new()
+        }
+    }
+
+    pub fn add_bpm_change(&mut self, timestamp: u64, bpm: u32) {
+        self.bpm_changes.push(BpmChange::new(timestamp, bpm));
+    }
+
+    pub fn delete_last_bpm_change(&mut self) {
+        self.bpm_changes.pop();
+    }
+
+    pub fn get_bpm_change_index(&self, timestamp: u64) -> Option<usize> {
+        for (idx, bc) in self.bpm_changes.iter().enumerate() {
+            if (bc.timestamp) == timestamp {
+                return Some(idx);
+            }
+        }
+        None
+    }
+
+    pub fn initial_bpm(&self) -> u32 {
+        self.bpm_changes[0].bpm
+    }
+    
+    pub fn add_time_change(&mut self, timestamp: u64, time: (u8, u8)) {
+        self.time_changes.push(TimeChange::new(timestamp, time));
+    }
+
+    pub fn add_keyframe_channel(&mut self, name: String) {
+        self.keyframe_channels.push(KeyframeChannel::new(name));
+    }
+
+    pub fn keyframe_channel_by_name(
+        &self,
+        name: String
+    ) -> Option<&KeyframeChannel> {
+        for chan in self.keyframe_channels.iter() {
+            if chan.name == name {
+                return Some(chan);
+            }
+        }
+        None
+    }
+}
+
+impl BpmChange {
+    pub fn new(timestamp: u64, bpm: u32) -> BpmChange {
+        BpmChange { timestamp, bpm }
+    }
+}
+
+impl TimeChange {
+    pub fn new(timestamp: u64, time: (u8, u8)) -> TimeChange {
+        TimeChange { timestamp, time }
+    }
+}
+
+impl KeyframeChannel {
+    pub fn new(name: String) -> KeyframeChannel {
+        KeyframeChannel {
+            name,
+            enabled: true,
+            keyframes: Vec::<Keyframe>::new()
+        }
+    }
+
+    pub fn add_keyframe(&mut self, timestamp: u64) {
+        self.keyframes.push(Keyframe {
+            kf_type: KeyframeType::Tick,
+            timestamp
+        });
+    }
+    
+    // TODO: improve efficiency of this method
+    pub fn keyframe_at_timestamp(&self, timestamp: u64) -> Option<&Keyframe> {
+        for keyframe in self.keyframes.iter() {
+            if keyframe.timestamp == timestamp {
+                return Some(keyframe);
+            }
+        }
+        None
+    }
+}

src/ui_generic.rs

@@ -0,0 +1,2 @@
+pub mod drag_area;
+pub mod keyframe_editor;

src/ui_generic/drag_area.rs

@@ -0,0 +1,98 @@
+// Node editor UI element
+
+#[allow(dead_code)]
+
+use glium::glutin::window::Window as GlutinWindow;
+use glium::glutin::dpi::LogicalPosition;
+use imgui::{Ui, MouseButton};
+use imgui::color::ImColor32;
+use imgui::draw_list::DrawListMut;
+
+pub struct DragArea {
+    pub offset: [f32; 2],
+    pub size: [f32; 2],
+    pub border_color: ImColor32,
+    pub default_offset: [f32; 2],
+    default_size: [f32; 2],
+    active: bool
+}
+
+impl DragArea {
+    pub fn new(size: [f32; 2], offset: [f32; 2]) -> DragArea {
+        DragArea {
+            offset,
+            size,
+            border_color: ImColor32::from_rgb(15u8, 20u8, 25u8),
+            default_offset: offset,
+            default_size: size,
+            active: false
+        }
+    }
+
+    pub fn build
+        <F: FnMut(&DrawListMut, &[f32; 2], &[f32; 2], &[f32; 2])>
+        (&mut self, ui: &Ui, window: &GlutinWindow, mut build_children: F)
+    {
+        let mouse_delta = ui.io().mouse_delta;
+        let mouse_pos = ui.io().mouse_pos;
+        
+        if ui.button("reset view") {
+            self.offset = self.default_offset;
+        }
+
+        ui.invisible_button("##empty", self.size);
+
+        let rect_min = ui.item_rect_min();
+        let rect_max = ui.item_rect_max();
+
+        let lmb_down = ui.is_mouse_dragging(MouseButton::Left);
+        let mmb_down = ui.is_mouse_dragging(MouseButton::Middle);
+        let hovered = ui.is_item_hovered();
+
+        if !self.active && ((lmb_down || mmb_down) && hovered) {
+            self.active = true;
+        } else if self.active && !(lmb_down || mmb_down) {
+            self.active = false;
+        }
+
+        if self.active {
+            if rect_min[0] > mouse_pos[0] {
+                window.set_cursor_position(
+                    LogicalPosition { x: rect_max[0], y: mouse_pos[1] }
+                ).unwrap();
+                self.offset[0] -= self.size[0];
+            }
+
+            if rect_max[0] < mouse_pos[0] {
+                window.set_cursor_position(
+                    LogicalPosition { x: rect_min[0], y: mouse_pos[1] }
+                ).unwrap();
+                self.offset[0] += self.size[0];
+            }
+
+            if rect_min[1] > mouse_pos[1] {
+                window.set_cursor_position(
+                    LogicalPosition { x: mouse_pos[0], y: rect_max[1] }
+                ).unwrap();
+                self.offset[1] -= self.size[1];
+            }
+
+            if rect_max[1] < mouse_pos[1] {
+                window.set_cursor_position(
+                    LogicalPosition { x: mouse_pos[0], y: rect_min[1] }
+                ).unwrap();
+                self.offset[1] += self.size[1];
+            }
+            
+            self.offset[0] += mouse_delta[0];
+            self.offset[1] += mouse_delta[1];
+        }
+
+        let draw_list = ui.get_window_draw_list();
+
+        draw_list.with_clip_rect(rect_min, rect_max, || {
+            build_children(&draw_list, &rect_min, &rect_max, &self.offset);
+            draw_list.add_rect(rect_min, rect_max, self.border_color).build();
+        });
+    }
+}

src/ui_generic/keyframe_editor.rs

@@ -0,0 +1,153 @@
+use glium::Display;
+use imgui::Ui;
+use imgui::color::ImColor32;
+
+use crate::ui_generic::drag_area::DragArea;
+use crate::storage::Storage;
+
+const KF_CHAN_HEIGHT: f32 = 20.0;
+const KF_CHAN_TITLE_DEFAULT_COLOR: ImColor32 = 
+    ImColor32::from_rgb(38, 38, 38);
+const KF_CHAN_TITLE_HOVER_COLOR: ImColor32 =
+    ImColor32::from_rgb(79, 79, 79);
+const KF_CHAN_CONTENT_DEFAULT_COLOR: ImColor32 =
+    ImColor32::from_rgb(16, 16, 16);
+const KF_CHAN_CONTENT_HOVER_COLOR: ImColor32 =
+    ImColor32::from_rgb(54, 54, 54);
+
+pub struct KeyframeEditor {
+    pub drag_area: DragArea
+}
+
+impl KeyframeEditor {
+    pub fn new(size: [f32; 2]) -> KeyframeEditor {
+        KeyframeEditor {
+            drag_area: DragArea::new(size, [0.0, 0.0])
+        }
+    }
+
+    pub fn build(
+        &mut self,
+        ui: &Ui,
+        display: &Display,
+        storage: &mut Storage
+    ) {
+        self.drag_area.build(
+            &ui,
+            &display.gl_window().window(),
+            |draw_list, area_min, area_max, offset| {
+                let mouse_y = ui.io().mouse_pos[1];
+
+                let origin: [f32; 2];
+
+                if storage.keyframe_channels.len() == 0 {
+                    let text_pos: [f32; 2] = [
+                        area_min[0] + (area_max[0] - area_min[0]) / 2.0 - 50.0,
+                        area_min[1] + (area_max[1] - area_min[1]) / 2.0 - 2.5
+                    ];
+
+                    draw_list.add_text(
+                        text_pos,
+                        KF_CHAN_TITLE_HOVER_COLOR,
+                        "No keyframes to show."
+                    );
+
+                    return;
+                }
+
+                let origin = [
+                    area_min[0] + offset[0],
+                    area_min[1] + offset[1]
+                ];
+
+                let mut chan_y: f32 = 1.0;
+                let mut next_chan_y: f32 = chan_y + KF_CHAN_HEIGHT;
+
+                for (idx, chan) in storage.keyframe_channels.iter().enumerate() {
+                    let title_bg: ImColor32;
+                    let content_bg: ImColor32;
+
+                    if (
+                        (mouse_y < origin[1] + next_chan_y) &&
+                        (mouse_y > origin[1] + chan_y)
+                    ) {
+                        content_bg = KF_CHAN_CONTENT_HOVER_COLOR;
+                        title_bg = KF_CHAN_TITLE_HOVER_COLOR;
+                    } else {
+                        content_bg = KF_CHAN_CONTENT_DEFAULT_COLOR;
+                        title_bg = KF_CHAN_TITLE_DEFAULT_COLOR;
+                    }
+
+                    let chan_title_start: [f32; 2] = [
+                        origin[0] + 1.0,
+                        origin[1] + chan_y + 1.0
+                    ];
+
+                    let chan_title_end: [f32; 2] = [
+                        origin[0] + 100.0,
+                        origin[1] + next_chan_y + 1.0
+                    ];
+
+                    draw_list
+                        .add_rect(
+                            chan_title_start,
+                            chan_title_end,
+                            title_bg
+                        )
+                        .filled(true)
+                        .thickness(0.0)
+                        .build();
+
+                    let title_pos: [f32; 2] = [
+                        origin[0] + 1.0 + 3.0,
+                        origin[1] + chan_y + 2.0
+                    ];
+
+                    draw_list.add_text(
+                        title_pos,
+                        ImColor32::WHITE,
+                        String::from(&chan.name)
+                    );
+
+                    let chan_content_end: [f32; 2] = [
+                        area_max[0],
+                        chan_title_start[1]
+                    ];
+
+                    draw_list
+                        .add_rect(
+                            chan_title_end,
+                            chan_content_end,
+                            content_bg
+                        )
+                        .filled(true)
+                        .thickness(0.0)
+                        .build();
+                    
+                    if true {
+                        let border_start = [
+                            origin[0],
+                            origin[1] + next_chan_y
+                        ];
+
+                        let border_end = [
+                            area_max[0],
+                            origin[1] + next_chan_y
+                        ];
+
+                        draw_list
+                            .add_line(
+                                border_start,
+                                border_end,
+                                title_bg
+                            )
+                            .build();
+                    }
+
+                    chan_y += KF_CHAN_HEIGHT;
+                    next_chan_y += KF_CHAN_HEIGHT;
+                }
+            }
+        );
+    }
+}