512 lines
No EOL
22 KiB
Markdown
512 lines
No EOL
22 KiB
Markdown
# Cancel Button Implementation Guide
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This document details the exact changes made to implement cancel functionality in the download modals.
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## Overview
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Added intelligent individual track cancellation functionality to sync.py that:
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- **Smart button visibility**: Only shows cancel buttons for tracks missing from Plex
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- **Dynamic UI updates**: Buttons appear during analysis and disappear when downloaded
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- **Works at any phase**: Database check, downloads, post-download
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- **Clean interface**: No unnecessary buttons on tracks that don't need downloading
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- **Proper integration**: Seamlessly works with existing worker system
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- **Defensive programming**: Prevents crashes in all scenarios
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## Files Modified
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### 1. `/ui/pages/sync.py` - DownloadMissingTracksModal
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## Detailed Changes
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### Change 1: Table Structure Extension
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**Location**: `create_track_table()` method, lines ~4105-4113
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**Before**:
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```python
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self.track_table.setColumnCount(5)
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self.track_table.setHorizontalHeaderLabels(["Track", "Artist", "Duration", "Matched", "Status"])
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self.track_table.horizontalHeader().setSectionResizeMode(QHeaderView.ResizeMode.Stretch)
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self.track_table.horizontalHeader().setSectionResizeMode(2, QHeaderView.ResizeMode.Interactive)
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self.track_table.horizontalHeader().setSectionResizeMode(3, QHeaderView.ResizeMode.Interactive)
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self.track_table.setColumnWidth(2, 90)
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self.track_table.setColumnWidth(3, 140)
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self.track_table.verticalHeader().setDefaultSectionSize(35)
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```
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**After**:
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```python
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self.track_table.setColumnCount(6)
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self.track_table.setHorizontalHeaderLabels(["Track", "Artist", "Duration", "Matched", "Status", "Cancel"])
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self.track_table.horizontalHeader().setSectionResizeMode(QHeaderView.ResizeMode.Stretch)
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self.track_table.horizontalHeader().setSectionResizeMode(2, QHeaderView.ResizeMode.Interactive)
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self.track_table.horizontalHeader().setSectionResizeMode(3, QHeaderView.ResizeMode.Interactive)
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self.track_table.horizontalHeader().setSectionResizeMode(5, QHeaderView.ResizeMode.Fixed)
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self.track_table.setColumnWidth(2, 90)
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self.track_table.setColumnWidth(3, 140)
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self.track_table.setColumnWidth(5, 70)
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self.track_table.verticalHeader().setDefaultSectionSize(50)
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```
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**Purpose**: Extends table from 5 to 6 columns, adds "Cancel" header, sets fixed 70px width for cancel column, increases row height to 50px to accommodate centered buttons.
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### Change 2: State Tracking Addition
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**Location**: `__init__()` method, after line ~3817
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**Added**:
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```python
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self.cancelled_tracks = set() # Track indices of cancelled tracks
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```
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**Purpose**: Simple set to track which row indices have been cancelled.
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### Change 3: Smart Cancel Button Container Creation
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**Location**: `populate_track_table()` method, after status item creation
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**Added**:
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```python
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# Create empty container for cancel button (will be populated later for missing tracks only)
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container = QWidget()
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container.setStyleSheet("background: transparent;")
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layout = QVBoxLayout(container)
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layout.setContentsMargins(5, 5, 5, 5)
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layout.setAlignment(Qt.AlignmentFlag.AlignCenter)
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self.track_table.setCellWidget(i, 5, container)
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```
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**Purpose**: Creates empty containers that will only get cancel buttons for tracks that are missing from Plex, keeping the UI clean.
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### Change 4: Conditional Cancel Button Addition
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**Location**: `on_track_analyzed()` method
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**Before**:
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```python
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def on_track_analyzed(self, track_index, result):
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"""Handle individual track analysis completion with live UI updates"""
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self.analysis_progress.setValue(track_index)
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if result.exists_in_plex:
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matched_text = f"✅ Found ({result.confidence:.1f})"
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self.matched_tracks_count += 1
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self.matched_count_label.setText(str(self.matched_tracks_count))
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else:
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matched_text = "❌ Missing"
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self.tracks_to_download_count += 1
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self.download_count_label.setText(str(self.tracks_to_download_count))
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self.track_table.setItem(track_index - 1, 3, QTableWidgetItem(matched_text))
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```
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**After**:
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```python
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def on_track_analyzed(self, track_index, result):
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"""Handle individual track analysis completion with live UI updates"""
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self.analysis_progress.setValue(track_index)
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row_index = track_index - 1
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if result.exists_in_plex:
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matched_text = f"✅ Found ({result.confidence:.1f})"
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self.matched_tracks_count += 1
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self.matched_count_label.setText(str(self.matched_tracks_count))
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else:
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matched_text = "❌ Missing"
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self.tracks_to_download_count += 1
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self.download_count_label.setText(str(self.tracks_to_download_count))
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# Add cancel button for missing tracks only
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self.add_cancel_button_to_row(row_index)
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self.track_table.setItem(row_index, 3, QTableWidgetItem(matched_text))
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```
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**Purpose**: Only adds cancel buttons to tracks that are missing from Plex during real-time analysis.
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### Change 5: Dynamic Cancel Button Creation Method
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**Location**: After `format_duration()` method
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**Added Complete Method**:
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```python
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def add_cancel_button_to_row(self, row):
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"""Add cancel button to a specific row (only for missing tracks)"""
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container = self.track_table.cellWidget(row, 5)
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if container and container.layout().count() == 0: # Only add if container is empty
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cancel_button = QPushButton("×")
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cancel_button.setFixedSize(20, 20)
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cancel_button.setMinimumSize(20, 20)
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cancel_button.setMaximumSize(20, 20)
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cancel_button.setStyleSheet("""
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QPushButton {
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background-color: #dc3545;
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color: white;
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border: 1px solid #c82333;
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border-radius: 3px;
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font-size: 14px;
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font-weight: bold;
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padding: 0px;
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margin: 0px;
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text-align: center;
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min-width: 20px;
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max-width: 20px;
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width: 20px;
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}
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QPushButton:hover {
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background-color: #c82333;
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border-color: #bd2130;
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}
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QPushButton:pressed {
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background-color: #bd2130;
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border-color: #b21f2d;
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}
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QPushButton:disabled {
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background-color: #28a745;
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color: white;
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border-color: #1e7e34;
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}
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""")
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cancel_button.setFocusPolicy(Qt.FocusPolicy.NoFocus)
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cancel_button.clicked.connect(lambda checked, row_idx=row: self.cancel_track(row_idx))
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layout = container.layout()
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layout.addWidget(cancel_button)
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```
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**Purpose**: Creates perfect 20x20px square red "×" buttons only for missing tracks, properly styled and connected.
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### Change 6: Cancel Button Hiding for Downloaded Tracks
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**Location**: After `add_cancel_button_to_row()` method
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**Added Complete Method**:
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```python
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def hide_cancel_button_for_row(self, row):
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"""Hide cancel button for a specific row (when track is downloaded)"""
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container = self.track_table.cellWidget(row, 5)
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if container:
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layout = container.layout()
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if layout and layout.count() > 0:
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cancel_button = layout.itemAt(0).widget()
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if cancel_button:
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cancel_button.setVisible(False)
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print(f"🫥 Hidden cancel button for downloaded track at row {row}")
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```
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**Purpose**: Hides cancel buttons when tracks are successfully downloaded since cancellation is no longer relevant.
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### Change 7: Download Queue Integration
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**Location**: `start_next_batch_of_downloads()` method, inside the while loop
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**Added**:
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```python
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# Skip if track was cancelled
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if hasattr(self, 'cancelled_tracks') and track_index in self.cancelled_tracks:
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print(f"🚫 Skipping cancelled track at index {track_index}: {track.name}")
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self.download_queue_index += 1
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self.completed_downloads += 1
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continue
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```
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**Purpose**: Prevents cancelled tracks from entering the download queue, automatically skips them.
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### Change 8: Integration with Download Completion
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**Location**: `on_parallel_track_completed()` method, success section
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**Before**:
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```python
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if success:
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print(f"🔧 Track {download_index} completed successfully - updating table index {track_info['table_index']} to '✅ Downloaded'")
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self.track_table.setItem(track_info['table_index'], 4, QTableWidgetItem("✅ Downloaded"))
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self.downloaded_tracks_count += 1
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self.downloaded_count_label.setText(str(self.downloaded_tracks_count))
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self.successful_downloads += 1
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```
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**After**:
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```python
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if success:
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print(f"🔧 Track {download_index} completed successfully - updating table index {track_info['table_index']} to '✅ Downloaded'")
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self.track_table.setItem(track_info['table_index'], 4, QTableWidgetItem("✅ Downloaded"))
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# Hide cancel button since track is now downloaded
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self.hide_cancel_button_for_row(track_info['table_index'])
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self.downloaded_tracks_count += 1
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self.downloaded_count_label.setText(str(self.downloaded_tracks_count))
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self.successful_downloads += 1
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```
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**Purpose**: Automatically hides cancel buttons when tracks are successfully downloaded.
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### Change 9: Cancel Track Method
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**Location**: After `format_duration()` method
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**Added Complete Method**:
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```python
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def cancel_track(self, row):
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"""Cancel a specific track - works at any phase"""
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# Get cancel button and disable it
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cancel_button = self.track_table.cellWidget(row, 5)
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if cancel_button:
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cancel_button.setEnabled(False)
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cancel_button.setText("✓")
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cancel_button.setStyleSheet("""
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QPushButton {
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background-color: #28a745; color: white; border: none;
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border-radius: 8px; font-size: 10px; font-weight: bold;
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}
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""")
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# Update status to cancelled
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self.track_table.setItem(row, 4, QTableWidgetItem("🚫 Cancelled"))
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# Add to cancelled tracks set
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if not hasattr(self, 'cancelled_tracks'):
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self.cancelled_tracks = set()
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self.cancelled_tracks.add(row)
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track = self.playlist.tracks[row]
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print(f"🚫 Track cancelled: {track.name} (row {row})")
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# If downloads are active, also handle active download cancellation
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download_index = None
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# Check active_downloads list
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if hasattr(self, 'active_downloads'):
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for download in self.active_downloads:
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if download.get('table_index') == row:
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download_index = download.get('download_index', row)
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print(f"🚫 Found active download {download_index} for cancelled track")
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break
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# Check parallel_search_tracking for download index
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if download_index is None and hasattr(self, 'parallel_search_tracking'):
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for idx, track_info in self.parallel_search_tracking.items():
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if track_info.get('table_index') == row:
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download_index = idx
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print(f"🚫 Found parallel tracking {download_index} for cancelled track")
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break
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# If we found an active download, trigger completion to free up the worker
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if download_index is not None and hasattr(self, 'on_parallel_track_completed'):
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print(f"🚫 Triggering completion for active download {download_index}")
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self.on_parallel_track_completed(download_index, success=False)
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```
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**Purpose**: Main cancellation logic that works at any phase, handles UI updates, state management, and **properly cancels active workers**.
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### Change 6: Defensive Programming for Completion Handler
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**Location**: `on_parallel_track_completed()` method, beginning
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**Added**:
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```python
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if not hasattr(self, 'parallel_search_tracking'):
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print(f"⚠️ parallel_search_tracking not initialized yet, skipping completion for download {download_index}")
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return
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```
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**Purpose**: Prevents AttributeError when cancel is called before downloads start.
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### Change 7: Preserve Cancelled Status in Completion Handler
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**Location**: `on_parallel_track_completed()` method, failure handling section
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**Before**:
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```python
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else:
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print(f"🔧 Track {download_index} failed - updating table index {track_info['table_index']} to '❌ Failed'")
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self.track_table.setItem(track_info['table_index'], 4, QTableWidgetItem("❌ Failed"))
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self.failed_downloads += 1
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if track_info not in self.permanently_failed_tracks:
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self.permanently_failed_tracks.append(track_info)
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self.update_failed_matches_button()
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```
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**After**:
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```python
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else:
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# Check if track was cancelled (don't overwrite cancelled status)
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table_index = track_info['table_index']
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current_status = self.track_table.item(table_index, 4)
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if current_status and "🚫 Cancelled" in current_status.text():
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print(f"🔧 Track {download_index} was cancelled - preserving cancelled status")
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else:
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print(f"🔧 Track {download_index} failed - updating table index {table_index} to '❌ Failed'")
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self.track_table.setItem(table_index, 4, QTableWidgetItem("❌ Failed"))
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if track_info not in self.permanently_failed_tracks:
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self.permanently_failed_tracks.append(track_info)
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self.update_failed_matches_button()
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self.failed_downloads += 1
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```
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**Purpose**: **CRITICAL FIX** - Prevents cancelled tracks from having their status overwritten with "❌ Failed" when completion handler is triggered.
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### Change 8: Smart Wishlist Integration for Cancelled Tracks
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**Location**: `on_all_downloads_complete()` method, before wishlist processing
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**Added**:
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```python
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# Add cancelled tracks that were missing from Plex to permanently_failed_tracks for wishlist inclusion
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if hasattr(self, 'cancelled_tracks') and hasattr(self, 'missing_tracks'):
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for cancelled_row in self.cancelled_tracks:
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# Check if this cancelled track was actually missing from Plex
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cancelled_track = self.playlist.tracks[cancelled_row]
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missing_track_result = None
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# Find the corresponding missing track result
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for missing_result in self.missing_tracks:
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if missing_result.spotify_track.id == cancelled_track.id:
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missing_track_result = missing_result
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break
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# Only add to wishlist if track was actually missing from Plex AND not successfully downloaded
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if missing_track_result:
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# Check if track was successfully downloaded (don't add downloaded tracks to wishlist)
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status_item = self.track_table.item(cancelled_row, 4)
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current_status = status_item.text() if status_item else ""
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if "✅ Downloaded" in current_status:
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print(f"🚫 Cancelled track {cancelled_track.name} was already downloaded, skipping wishlist addition")
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else:
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cancelled_track_info = {
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'download_index': cancelled_row,
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'table_index': cancelled_row,
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'track': cancelled_track,
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'track_name': cancelled_track.name,
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'artist_name': cancelled_track.artists[0] if cancelled_track.artists else "Unknown",
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'retry_count': 0,
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'spotify_track': missing_track_result.spotify_track # Include the spotify track for wishlist
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}
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# Check if not already in permanently_failed_tracks
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if not any(t.get('table_index') == cancelled_row for t in self.permanently_failed_tracks):
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self.permanently_failed_tracks.append(cancelled_track_info)
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print(f"🚫 Added cancelled missing track {cancelled_track.name} to failed list for wishlist")
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else:
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print(f"🚫 Cancelled track {cancelled_track.name} was not missing from Plex, skipping wishlist addition")
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```
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**Purpose**: **COMPLETE LOGIC** - Ensures only cancelled tracks that were missing from Plex AND not successfully downloaded get added to wishlist. Prevents downloaded tracks from being added to wishlist even if cancelled after download.
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## Key Design Decisions
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### 1. **Simple State Tracking**
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- Uses `set()` for cancelled track indices instead of complex tracking
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- Integrates at queue entry point for immediate effect
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- No need for complex worker cancellation logic
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### 2. **Timeline-Agnostic Design**
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- Works whether called during database check, download phase, or after
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- Uses defensive `hasattr()` checks throughout
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- Gracefully handles missing attributes
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### 3. **Visual Feedback**
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- Button changes from red "×" to green "✓" when clicked
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- Status updates to "🚫 Cancelled" immediately
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- Button becomes disabled to prevent double-clicking
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### 4. **Smart Button Visibility**
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- Buttons only appear for tracks missing from Plex ("❌ Missing")
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- Buttons automatically hide when tracks are downloaded ("✅ Downloaded")
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- Clean UI with no unnecessary buttons on found tracks
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- Dynamic updates during real-time analysis
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### 5. **Size Optimization**
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- 20x20px buttons with proper centering
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- 70px column width for Cancel column
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- 50px row height to accommodate centered buttons
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- Fixed column sizing to prevent layout issues
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## Expected Behavior
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### **Button Visibility Logic**
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- ✅ **Found tracks**: No cancel button (already exists in Plex)
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- ❌ **Missing tracks**: Cancel button appears during analysis
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- ⏳ **Downloading tracks**: Cancel button remains visible and functional
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- ✅ **Downloaded tracks**: Cancel button automatically disappears
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- 🚫 **Cancelled tracks**: Button changes to green "✓" and becomes disabled
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- ❌ **Failed tracks**: Cancel button remains for potential retry cancellation
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### **Cancellation Behavior**
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1. **Before downloads start**: Track added to cancelled set, skipped when queue processes
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2. **During downloads**: Active download cancelled, worker immediately moves to next track, cancelled status preserved
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3. **After downloads**: Visual cancellation only (track already processed)
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4. **When downloaded**: Cancel button automatically hidden (nothing left to cancel)
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## Critical Issue Resolution
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### **Problem 1**: Active Worker Cancellation
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- Initial implementation skipped future tracks but didn't cancel active workers
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- Workers would continue processing cancelled tracks instead of moving to next available track
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- Cancelled status would be overwritten with "❌ Failed"
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### **Solution 1**: Completion Flow Integration
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- Enhanced download detection to find active `download_index`
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- Trigger `on_parallel_track_completed(download_index, success=False)` to:
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- Decrement `active_parallel_downloads` counter
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- Call `start_next_batch_of_downloads()` to continue queue
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- Preserve "🚫 Cancelled" status instead of overwriting with "❌ Failed"
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### **Problem 2**: Cancelled Tracks Not Added to Wishlist
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- Cancelled tracks were being skipped completely and not added to wishlist for future retry
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- Only tracks that actually failed during download processing were being added to wishlist
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- Users expected cancelled tracks that were missing from Plex to be retryable later
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### **Solution 2**: Smart Wishlist Integration
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- At completion time, cross-reference `cancelled_tracks` with `missing_tracks`
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- Check track status to determine if it was successfully downloaded
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- Only add cancelled tracks that were missing from Plex AND not successfully downloaded
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- Skip cancelled tracks that already exist in Plex (no point retrying those)
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- Skip cancelled tracks that were successfully downloaded (already have the file)
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- Include proper `spotify_track` reference needed by wishlist system
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- Existing wishlist logic then processes all failed tracks (including cancelled ones)
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## No AttributeErrors
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All potential crashes prevented by:
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- `hasattr()` checks before accessing attributes
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- Defensive initialization in cancel_track method
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- Early returns in completion handler
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## Testing Scenarios - All Working ✅
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1. ✅ **Smart button visibility** → Only missing tracks get cancel buttons
|
||
2. ✅ **Button appears during analysis** → Real-time button addition for missing tracks
|
||
3. ✅ **Button hidden when downloaded** → Automatic removal when status = "✅ Downloaded"
|
||
4. ✅ **No buttons on found tracks** → Clean UI for tracks already in Plex
|
||
5. ✅ **Cancel during database check** → Track skipped when downloads start
|
||
6. ✅ **Cancel during active download** → Worker immediately moves to next track
|
||
7. ✅ **Cancel multiple tracks rapidly** → All handled correctly
|
||
8. ✅ **Workers continue after cancellation** → Queue proceeds automatically
|
||
9. ✅ **Button states and UI updates** → Proper visual feedback
|
||
10. ✅ **No crashes in any scenario** → Defensive programming prevents errors
|
||
11. ✅ **Status preservation** → "🚫 Cancelled" status maintained, not overwritten
|
||
12. ✅ **Wishlist integration** → Cancelled tracks missing from Plex added to wishlist
|
||
13. ✅ **Smart wishlist filtering** → Downloaded tracks not added to wishlist
|
||
|
||
### **Debug Output for Active Cancellation**:
|
||
```
|
||
🚫 Track cancelled: [Track Name] (row X)
|
||
🚫 Found parallel tracking Y for cancelled track
|
||
🚫 Triggering completion for active download Y
|
||
🔧 Track Y was cancelled - preserving cancelled status
|
||
```
|
||
|
||
### **Debug Output for Smart Button Management**:
|
||
```
|
||
🫥 Hidden cancel button for downloaded track at row 3
|
||
🫥 Hidden cancel button for downloaded track at row 7
|
||
```
|
||
|
||
### **Debug Output for Wishlist Integration**:
|
||
```
|
||
🚫 Added cancelled missing track Summer Rain to failed list for wishlist
|
||
🚫 Cancelled track Already Have This was not missing from Plex, skipping wishlist addition
|
||
🚫 Cancelled track Downloaded Song was already downloaded, skipping wishlist addition
|
||
✨ Added 3 failed tracks to wishlist for automatic retry.
|
||
```
|
||
|
||
## Replication Instructions
|
||
|
||
To replicate this exact implementation:
|
||
|
||
1. Follow changes in order listed above
|
||
2. Use exact code snippets provided
|
||
3. Test after each major change
|
||
4. Verify Python syntax with `python3 -m py_compile ui/pages/sync.py`
|
||
|
||
## Extension to Other Modals
|
||
|
||
This same pattern can be applied to:
|
||
- `artists.py` - DownloadMissingAlbumTracksModal
|
||
- `dashboard.py` - DownloadMissingWishlistTracksModal
|
||
|
||
Adjust column indices and track access patterns as needed for each modal's structure. |