Allow default datafile to be disabled

If this option is deselected, the default unit, prefix, dimension and
metric exception data will not be loaded, and only custom data and the
few units that are not provided by files will be available.

The main rationale for this change is so that the data can be localized
by custom unit files.

1 files changed, 15 insertions, 3 deletions

diff --git a/src/main/java/sevenUnitsGUI/TabbedView.java b/src/main/java/sevenUnitsGUI/TabbedView.java
index ca9f23c..40ed0a7 100644
--- a/src/main/java/sevenUnitsGUI/TabbedView.java
+++ b/src/main/java/sevenUnitsGUI/TabbedView.java
@@ -662,10 +662,22 @@ final class TabbedView implements ExpressionConversionView, UnitConversionView {
 			miscPanel.add(showAllVariations, new GridBagBuilder(0, 1, 2, 1)
 					.setAnchor(GridBagConstraints.LINE_START).build());
 			
+			final JCheckBox useDefaultFiles = new JCheckBox();
+			this.localizedTextSetters.put("tv.settings.use_default_files", 
+					useDefaultFiles::setText);
+			useDefaultFiles.setSelected(this.presenter.usingDefaultDatafiles());
+			useDefaultFiles.addItemListener(e -> {
+				this.presenter
+						.setUseDefaultDatafiles(e.getStateChange() == ItemEvent.SELECTED);
+				this.presenter.saveSettings();
+			});
+			miscPanel.add(useDefaultFiles, new GridBagBuilder(0, 2, 2, 1)
+					.setAnchor(GridBagConstraints.LINE_START).build());
+			
 			final JLabel localeLabel = new JLabel();
 			this.localizedTextSetters.put("tv.settings.locale", 
 					localeLabel::setText);
-			miscPanel.add(localeLabel, new GridBagBuilder(0, 2, 1, 1)
+			miscPanel.add(localeLabel, new GridBagBuilder(0, 3, 1, 1)
 					.setAnchor(GridBagConstraints.LINE_START).build());
 			
 			this.presenter.getAvailableLocales().stream().sorted()
@@ -675,14 +687,14 @@ final class TabbedView implements ExpressionConversionView, UnitConversionView {
 				this.presenter.setUserLocale((String) e.getItem());
 				this.presenter.saveSettings();
 			});
-			miscPanel.add(localeSelector, new GridBagBuilder(1, 2, 1, 1)
+			miscPanel.add(localeSelector, new GridBagBuilder(1, 3, 1, 1)
 					.setAnchor(GridBagConstraints.LINE_END).build());
 			
 			final JButton unitFileButton = new JButton();
 			this.localizedTextSetters.put("tv.settings.unitfiles.button", 
 					unitFileButton::setText);
 			unitFileButton.setEnabled(false);
-			miscPanel.add(unitFileButton, new GridBagBuilder(0, 3, 2, 1)
+			miscPanel.add(unitFileButton, new GridBagBuilder(0, 4, 2, 1)
 					.setAnchor(GridBagConstraints.LINE_START).build());
 		}