191 lines
10 KiB
Markdown
191 lines
10 KiB
Markdown
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# Technical Specification: Multi-Channel Layout Synchronization & Scroll Management (Unified DAW Layout & Sync Scroll)
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This document analyzes and defines the structural hierarchy of the graphical user interface based on the real-world interface analysis. This specification serves to guide Frontend interface programming and porting to a Python Desktop application running inside a Docker container.
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---
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## 1. Structural Wireframe
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Based on the visual analysis, the layout composition is split into vertically static and dynamic zones:
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```text
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+───────────────────────────────────────────────────────────────────────────────+
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| [ZONE A - STATIC] HEADER ZONE (Sticky - Permanently fixed when scrolling down)|
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| +────────────────────+──────────────────────────────────────────────────────+ |
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| | Channels & Tools | Time Ruler Scale | |
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| |--------------------|------------------------------------------------------| |
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| | Tempo Track Header | Tempo Grid Lane (120 BPM) | |
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| +────────────────────+──────────────────────────────────────────────────────+ |
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+───────────────────────────────────────────────────────────────────────────────+
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| [ZONE B - DYNAMIC] TRACKS SCROLL WORKSPACE (Synchronized vertical scroll) |
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| +────────────────────+──────────────────────────────────────────────────────+ |
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| | TCP - Track 01 | Waveform Lane - Track 01 | |
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| | TCP - Track 02 | Waveform Lane - Track 02 | |
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| | TCP - Track 03 | Waveform Lane - Track 03 | |
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| | ... | ... | |
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| +────────────────────+──────────────────────────────────────────────────────+ |
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+───────────────────────────────────────────────────────────────────────────────+ ▲
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│ [Vertical Scrollbar]
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│ (Single unified scroll)
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▼
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```
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---
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## 2. Layout Specifications
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### 2.1. Fixed Header Zone (Green Border Area - Sticky Header)
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* **Visual Scope:** Encompasses the toolbar, the time ruler scale, and the Tempo Track Lane (indicated by the green bounding border in `image_fbbd4e.png`).
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* **Graphical Sticky Behavior:**
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* When a user adds dozens of tracks and scrolls downward, this entire zone must remain anchored to the top of the screen and is not permitted to slide out of view.
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* This ensures that users can continuously track the Ruler Seconds and the master project tempo (Tempo BPM) while editing tracks located deeper down the timeline.
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### 2.2. Absolute Horizontal Row Alignment (Red Border Area - Row Alignment)
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* **Interaction Scope:** The exact matching pair consisting of the left Track Control Panel (TCP) and the right Waveform Lane of the same track (e.g., Track 4 inside the red border of `image_fbbd4e.png`).
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* **Row Alignment Rules:**
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* The corresponding TCP and Waveform Lane must have identical heights ($H = 96\text{ px}$).
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* These two elements must be wrapped within a single parent row container (`Flex Row` or `Grid Row`) to guarantee that during vertical scrolling, both move simultaneously along the exact same vertical axis coordinate ($Y$).
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* Row misalignment must be strictly avoided (e.g., situations where the Track 4 TCP sits higher or lower than the Track 4 Waveform lane).
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### 2.3. Single Vertical Scrollbar Mandate
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* **Issue to Avoid:** Separating the TCP into an independent scrollable column and the Timeline into another independent scrollable column. Doing so leads to scroll-position desynchronization errors when a user drags the scrollbar.
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* **Design Standard:**
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* Only a single unified Vertical Scrollbar is permitted to appear on the absolute far right of the application window (as directed by the two red arrows in `image_fbbd4e.png`).
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* This vertical scrollbar moves the entire dynamic wrapper (**Tracks Scroll Workspace**), scrolling both TCPs and Waveform Lanes up or down in sync.
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---
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## 3. Implementation Guide
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### 3.1. Web Frontend Integration (HTML / Tailwind CSS)
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To group everything into one scrollbar while keeping the Tempo Track anchored at the top, use `position: sticky` and wrap the dynamic track list inside a single container:
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```html
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<!-- Main Container (Entire Editor Wrapper) -->
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<div class="flex flex-col h-full overflow-hidden">
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<!-- [ZONE A] Top Anchored Sticky Header Zone -->
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<div class="sticky top-0 z-40 bg-[#242424] border-b border-[#141414] shrink-0">
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<!-- Toolbar & Time Ruler -->
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<div class="h-8 flex">
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<div class="w-[300px] border-r border-zinc-900 px-4 flex items-center">CHANNELS</div>
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<div class="flex-1 relative h-full">...Ruler Numbers...</div>
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</div>
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<!-- Tempo Track (Green Border Area) -->
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<div class="h-[44px] flex border-t border-zinc-800 bg-[#212121]">
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<div class="w-[300px] border-r border-zinc-900 px-4 flex items-center justify-between">
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<span class="font-bold text-zinc-400">Tempo Track</span>
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<span class="bg-zinc-800 px-1.5 py-0.5 rounded text-[10px]">120 BPM</span>
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</div>
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<div class="flex-1">...Tempo Grid Lines...</div>
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</div>
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</div>
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<!-- [ZONE B] Dynamic Track Workspace (Single global vertical scrollbar on the far right) -->
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<div class="flex-1 overflow-y-auto bg-[#1a1a1a]">
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<div class="flex flex-col divide-y divide-[#141414]">
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<!-- Track Row Container (Absolute Horizontal Row Alignment) -->
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<div class="h-[96px] flex hover:bg-zinc-800/20 transition-colors">
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<!-- Left: TCP -->
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<div class="w-[300px] border-r border-zinc-900 p-2.5 flex-shrink-0">
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...Controls (Mute, Solo, Volume, File Name)...
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</div>
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<!-- Right: Waveform Lane -->
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<div class="flex-1 relative overflow-hidden">
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...Waveform Canvas...
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</div>
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</div>
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<!-- Add more track rows repeating the structure above... -->
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</div>
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</div>
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</div>
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```
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### 3.2. Desktop App Integration (Python PyQt6)
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When engineering this user interface using the Qt framework in Python, utilize a `QScrollArea` to encapsulate a `QWidget` managed by a layout of rows to control the single scrollbar behavior:
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```python
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from PyQt6.QtWidgets import QWidget, QVBoxLayout, QHBoxLayout, QScrollArea, QLabel
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from PyQt6.QtCore import Qt
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class MasterDAWWidget(QWidget):
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def __init__(self):
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super().__init__()
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self.main_layout = QVBoxLayout(self)
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self.main_layout.setContentsMargins(0, 0, 0, 0)
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self.main_layout.setSpacing(0)
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# 1. Initialize Fixed Header (Toolbar, Ruler, Tempo)
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self.header_widget = QWidget()
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self.header_widget.setFixedHeight(76) # 32px Ruler + 44px Tempo
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self.setup_header_ui()
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self.main_layout.addWidget(self.header_widget)
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# 2. Initialize Scroll Area for dynamic track rows
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self.scroll_area = QScrollArea()
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self.scroll_area.setWidgetResizable(True)
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# Force a single vertical scrollbar on the far right
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self.scroll_area.setVerticalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOn)
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self.scroll_area.setHorizontalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
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# Widget container hosting the track list inside the Scroll Area
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self.tracks_container = QWidget()
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self.tracks_layout = QVBoxLayout(self.tracks_container)
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self.tracks_layout.setContentsMargins(0, 0, 0, 0)
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self.tracks_layout.setSpacing(0)
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self.tracks_layout.setAlignment(Qt.AlignmentFlag.AlignTop)
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self.scroll_area.setWidget(self.tracks_container)
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self.main_layout.addWidget(self.scroll_area)
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def add_track_row(self, track_id, track_name):
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"""
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Appends a new track row. Uses QHBoxLayout to lock the TCP and Waveform Lane
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into absolute horizontal sync within the row.
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"""
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row_widget = QWidget()
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row_widget.setFixedHeight(96) # Rigid constraint for the entire row
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row_layout = QHBoxLayout(row_widget)
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row_layout.setContentsMargins(0, 0, 0, 0)
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row_layout.setSpacing(0)
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# Left: Track Control Panel (TCP)
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tcp_widget = QWidget()
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tcp_widget.setFixedWidth(300)
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# Setup TCP UI components...
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row_layout.addWidget(tcp_widget)
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# Right: Waveform Lane
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waveform_widget = QWidget()
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# Setup Waveform Canvas Painter...
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row_layout.addWidget(waveform_widget)
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self.tracks_layout.addWidget(row_widget)
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```
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---
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## 4. Layout Architecture Advantages
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* **Fluid User Experience:** Eliminates row-stuttering or scrolling layout shifts between the control panels and audio visuals when a user scrolls through long track stacks rapidly.
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* **Flawless Python Porting Compatibility:** By wrapping the TCP and the Waveform Canvas inside a common row (`QHBoxLayout` in Qt or `Flex Row` in Web), the core widget tree hierarchy remains incredibly lean. This design removes the need to write custom coordinate bridging code to bind two separate scroll engines together.
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* **Clean Interface Aesthetics:** Safely protects the pixel rendering mapping ratios of the fixed time grids at the top, precisely matching the professional DAW interface conventions observed |