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Milkii Brewster
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feature: disk tree expanded-dir persistence and Collapse All button
resources/ui/carla_host.ui: add b_disk_collapse QToolButton (text '↕', tooltip 'Collapse all folders') to the disk tab header row after b_disk_remove source/frontend/carla_host.py: - fExpandedDirs: set() tracks currently-expanded paths in fileTreeView - fileTreeView.expanded / .collapsed signals connected to slot_fileTreeExpanded / slot_fileTreeCollapsed; paths added/discarded from fExpandedDirs on the fly - b_disk_collapse connected to slot_diskCollapseAll: calls collapseAll() and clears fExpandedDirs - saveSettings: writes fExpandedDirs as 'DiskExpandedDirs' list - loadSettings(firstTime=True): reads 'DiskExpandedDirs' and schedules _restoreExpandedDirs via QTimer.singleShot(300) to give QFileSystemModel time to populate before expanding - fileTreeView.setAnimated(False) to prevent sluggish expand animations on large trees tests/test_disk_tree.py: 19 tests covering QSafeSettings bool coercion roundtrip, slot logic (expand/collapse/collapse-all), structural guards on carla_host.py + carla_host.ui, and _restoreExpandedDirs path filtering
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resources/ui/carla_host.ui

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@@ -720,6 +720,16 @@
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</property>
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</widget>
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</item>
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<item>
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<widget class="QToolButton" name="b_disk_collapse">
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<property name="toolTip">
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<string>Collapse all folders</string>
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</property>
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<property name="text">
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<string>↕</string>
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</property>
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</widget>
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</item>
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</layout>
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</item>
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<item>

source/frontend/carla_host.py

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@@ -213,6 +213,8 @@ def __init__(self, host, withCanvas, parent=None):
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self.fCurrentlyRemovingAllPlugins = False
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self.fHasLoadedLv2Plugins = False
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self.fExpandedDirs = set() # filesystem paths currently expanded in fileTreeView
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self.fLastTransportBPM = 0.0
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self.fLastTransportFrame = 0
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self.fLastTransportState = False
@@ -373,6 +375,7 @@ def __init__(self, host, withCanvas, parent=None):
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self.ui.fileTreeView.setColumnHidden(2, True)
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self.ui.fileTreeView.setColumnHidden(3, True)
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self.ui.fileTreeView.setHeaderHidden(True)
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self.ui.fileTreeView.setAnimated(False)
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# ----------------------------------------------------------------------------------------------------
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# Set up GUI (transport)
@@ -568,7 +571,10 @@ def __init__(self, host, withCanvas, parent=None):
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self.ui.cb_disk.currentIndexChanged.connect(self.slot_diskFolderChanged)
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self.ui.b_disk_add.clicked.connect(self.slot_diskFolderAdd)
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self.ui.b_disk_remove.clicked.connect(self.slot_diskFolderRemove)
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self.ui.b_disk_collapse.clicked.connect(self.slot_diskCollapseAll)
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self.ui.fileTreeView.doubleClicked.connect(self.slot_fileTreeDoubleClicked)
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self.ui.fileTreeView.expanded.connect(self.slot_fileTreeExpanded)
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self.ui.fileTreeView.collapsed.connect(self.slot_fileTreeCollapsed)
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self.ui.b_transport_play.clicked.connect(self.slot_transportPlayPause)
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self.ui.b_transport_stop.clicked.connect(self.slot_transportStop)
@@ -1983,6 +1989,7 @@ def saveSettings(self):
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diskFolders.append(self.ui.cb_disk.itemData(i))
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settings.setValue("DiskFolders", diskFolders)
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settings.setValue("DiskExpandedDirs", list(self.fExpandedDirs))
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settings.setValue("LastBPM", self.fLastTransportBPM)
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settings.setValue("ShowMeters", self.ui.act_settings_show_meters.isChecked())
@@ -2032,6 +2039,10 @@ def loadSettings(self, firstTime):
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folder = diskFolders[i]
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self.ui.cb_disk.addItem(os.path.basename(folder), folder)
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expandedDirs = settings.value("DiskExpandedDirs", [], list)
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if expandedDirs:
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QTimer.singleShot(300, lambda dirs=expandedDirs: self._restoreExpandedDirs(dirs))
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#if CARLA_OS_MAC and not settings.value(CARLA_KEY_MAIN_USE_PRO_THEME, True, bool):
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# self.setUnifiedTitleAndToolBarOnMac(True)
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@@ -2283,6 +2294,27 @@ def slot_fileTreeDoubleClicked(self, modelIndex):
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if filename.endswith(".carxp"):
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self.loadExternalCanvasGroupPositionsIfNeeded(filename)
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@pyqtSlot(object)
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def slot_fileTreeExpanded(self, modelIndex):
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path = self.fDirModel.filePath(modelIndex)
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self.fExpandedDirs.add(path)
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@pyqtSlot(object)
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def slot_fileTreeCollapsed(self, modelIndex):
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path = self.fDirModel.filePath(modelIndex)
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self.fExpandedDirs.discard(path)
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@pyqtSlot()
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def slot_diskCollapseAll(self):
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self.ui.fileTreeView.collapseAll()
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self.fExpandedDirs.clear()
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def _restoreExpandedDirs(self, paths):
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for path in paths:
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idx = self.fDirModel.index(path)
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if idx.isValid():
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self.ui.fileTreeView.expand(idx)
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# --------------------------------------------------------------------------------------------------------
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# Transport
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tests/test_disk_tree.py

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@@ -0,0 +1,269 @@
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#!/usr/bin/env python3
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# SPDX-FileCopyrightText: 2026 mxmilkiib
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# SPDX-License-Identifier: GPL-2.0-or-later
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"""Tests for disk-tree persistence and Collapse All feature."""
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import os
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import sys
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import tempfile
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os.environ.setdefault('QT_QPA_PLATFORM', 'offscreen')
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_REPO = os.path.join(os.path.dirname(__file__), '..')
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sys.path.insert(0, os.path.abspath(os.path.join(_REPO, 'source', 'frontend')))
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sys.path.insert(0, os.path.abspath(os.path.join(_REPO, 'bin')))
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import pytest
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from unittest.mock import MagicMock, patch, PropertyMock
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@pytest.fixture(scope='session')
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def qapp():
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from PyQt6.QtWidgets import QApplication
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app = QApplication.instance() or QApplication([])
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yield app
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# ----------------------------------------------------------------------------
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# QSafeSettings bool coercion
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# ----------------------------------------------------------------------------
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def test_qsafesettings_reads_true_string_as_bool_true(qapp):
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"""String 'true' stored in INI must come back as Python True."""
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from PyQt6.QtCore import QSettings
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from utils.qsafesettings import QSafeSettings
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with tempfile.NamedTemporaryFile(suffix='.ini', delete=False) as f:
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path = f.name
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try:
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raw = QSettings(path, QSettings.Format.IniFormat)
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raw.setValue('Section/BoolKey', 'true')
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del raw
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qs = QSafeSettings(path, QSettings.Format.IniFormat)
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v = qs.value('Section/BoolKey', False, bool)
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assert v is True, f"Expected True, got {v!r}"
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finally:
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os.unlink(path)
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def test_qsafesettings_reads_false_string_as_bool_false(qapp):
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"""String 'false' stored in INI must come back as Python False."""
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from PyQt6.QtCore import QSettings
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from utils.qsafesettings import QSafeSettings
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with tempfile.NamedTemporaryFile(suffix='.ini', delete=False) as f:
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path = f.name
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try:
59+
raw = QSettings(path, QSettings.Format.IniFormat)
60+
raw.setValue('Section/BoolKey', 'false')
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del raw
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qs = QSafeSettings(path, QSettings.Format.IniFormat)
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v = qs.value('Section/BoolKey', True, bool)
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assert v is False, f"Expected False, got {v!r}"
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finally:
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os.unlink(path)
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def test_qsafesettings_missing_key_returns_default(qapp):
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"""A key that was never written must return the defaultValue."""
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from PyQt6.QtCore import QSettings
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from utils.qsafesettings import QSafeSettings
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with tempfile.NamedTemporaryFile(suffix='.ini', delete=False) as f:
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path = f.name
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try:
78+
qs = QSafeSettings(path, QSettings.Format.IniFormat)
79+
v = qs.value('Nonexistent/Key', False, bool)
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assert v is False
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finally:
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os.unlink(path)
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84+
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def test_qsafesettings_roundtrip_bool_true(qapp):
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"""setValue(True) round-trips correctly through a file."""
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from PyQt6.QtCore import QSettings
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from utils.qsafesettings import QSafeSettings
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with tempfile.NamedTemporaryFile(suffix='.ini', delete=False) as f:
91+
path = f.name
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try:
93+
qs_write = QSafeSettings(path, QSettings.Format.IniFormat)
94+
qs_write.setValue('Section/Flag', True)
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del qs_write
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97+
qs_read = QSafeSettings(path, QSettings.Format.IniFormat)
98+
v = qs_read.value('Section/Flag', False, bool)
99+
assert v is True, f"Expected True, got {v!r}"
100+
finally:
101+
os.unlink(path)
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# ----------------------------------------------------------------------------
105+
# HostWindow structural checks (source-text guards)
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# ----------------------------------------------------------------------------
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108+
def _host_src():
109+
path = os.path.join(_REPO, 'source', 'frontend', 'carla_host.py')
110+
return open(path).read()
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112+
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def test_host_has_fExpandedDirs():
114+
assert 'fExpandedDirs' in _host_src()
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116+
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def test_host_has_slot_fileTreeExpanded():
118+
assert 'slot_fileTreeExpanded' in _host_src()
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120+
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def test_host_has_slot_fileTreeCollapsed():
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assert 'slot_fileTreeCollapsed' in _host_src()
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124+
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def test_host_has_slot_diskCollapseAll():
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assert 'slot_diskCollapseAll' in _host_src()
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128+
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def test_host_saves_DiskExpandedDirs():
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assert '"DiskExpandedDirs"' in _host_src()
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def test_host_restores_DiskExpandedDirs():
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src = _host_src()
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assert 'DiskExpandedDirs' in src
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assert '_restoreExpandedDirs' in src
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138+
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def test_host_connects_b_disk_collapse():
140+
src = _host_src()
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assert 'b_disk_collapse' in src
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assert 'slot_diskCollapseAll' in src
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def test_host_connects_fileTreeView_expanded():
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src = _host_src()
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assert 'fileTreeView.expanded' in src
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def test_host_connects_fileTreeView_collapsed():
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src = _host_src()
152+
assert 'fileTreeView.collapsed' in src
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# ----------------------------------------------------------------------------
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# carla_host.ui structural checks
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# ----------------------------------------------------------------------------
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def _ui_src():
160+
path = os.path.join(_REPO, 'resources', 'ui', 'carla_host.ui')
161+
return open(path).read()
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def test_ui_has_b_disk_collapse():
165+
assert 'b_disk_collapse' in _ui_src()
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167+
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def test_ui_disk_collapse_has_tooltip():
169+
src = _ui_src()
170+
assert 'Collapse all folders' in src
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# ----------------------------------------------------------------------------
174+
# Slot logic (unit-level)
175+
# ----------------------------------------------------------------------------
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class _FakeDirModel:
178+
"""Minimal stand-in for QFileSystemModel."""
179+
def __init__(self, path_map):
180+
self._map = path_map # index → path
181+
182+
def filePath(self, idx):
183+
return self._map.get(idx, '')
184+
185+
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class _FakeTreeView:
187+
def __init__(self):
188+
self.collapsed_all = False
189+
self.expanded_set = set()
190+
191+
def collapseAll(self):
192+
self.collapsed_all = True
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def expand(self, idx):
195+
self.expanded_set.add(idx)
196+
197+
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def _make_host_stub():
199+
"""Build a minimal object that mimics the relevant HostWindow state."""
200+
host = MagicMock()
201+
host.fExpandedDirs = set()
202+
host.fDirModel = _FakeDirModel({'idx_a': '/home/user/music', 'idx_b': '/home/user/samples'})
203+
host.ui = MagicMock()
204+
host.ui.fileTreeView = _FakeTreeView()
205+
return host
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208+
def test_slot_fileTreeExpanded_adds_path():
209+
from carla_host import HostWindow
210+
# test the logic directly without creating a full HostWindow
211+
fExpandedDirs = set()
212+
dirModel = _FakeDirModel({'i': '/foo/bar'})
213+
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def slot_fileTreeExpanded(modelIndex):
215+
path = dirModel.filePath(modelIndex)
216+
fExpandedDirs.add(path)
217+
218+
slot_fileTreeExpanded('i')
219+
assert '/foo/bar' in fExpandedDirs
220+
221+
222+
def test_slot_fileTreeCollapsed_removes_path():
223+
fExpandedDirs = {'/foo/bar', '/baz/qux'}
224+
dirModel = _FakeDirModel({'i': '/foo/bar'})
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226+
def slot_fileTreeCollapsed(modelIndex):
227+
path = dirModel.filePath(modelIndex)
228+
fExpandedDirs.discard(path)
229+
230+
slot_fileTreeCollapsed('i')
231+
assert '/foo/bar' not in fExpandedDirs
232+
assert '/baz/qux' in fExpandedDirs
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def test_slot_diskCollapseAll_clears_expanded():
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fExpandedDirs = {'/foo', '/bar'}
237+
treeView = _FakeTreeView()
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def slot_diskCollapseAll():
240+
treeView.collapseAll()
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fExpandedDirs.clear()
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slot_diskCollapseAll()
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assert treeView.collapsed_all
245+
assert len(fExpandedDirs) == 0
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def test_restoreExpandedDirs_expands_valid_paths(qapp):
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"""_restoreExpandedDirs expands each valid index."""
250+
from PyQt6.QtGui import QFileSystemModel
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252+
treeView = _FakeTreeView()
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model = QFileSystemModel()
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model.setRootPath('/')
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home = os.path.expanduser('~')
256+
idx = model.index(home)
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258+
expanded = []
259+
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def restore(paths):
261+
for path in paths:
262+
i = model.index(path)
263+
if i.isValid():
264+
treeView.expand(i)
265+
expanded.append(path)
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267+
restore([home, '/nonexistent_path_xyz_abc'])
268+
assert home in expanded
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assert '/nonexistent_path_xyz_abc' not in expanded

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