From 8c26e0323ffeab41b3cb4d3767b5ad3867b36e56 Mon Sep 17 00:00:00 2001
From: Karl Tauber <karl@jformdesigner.com>
Date: Sun, 22 Aug 2021 15:33:29 +0200
Subject: [PATCH] Theme Editor: increment/decrement numbers at caret using
 `Ctrl+UP`/`Ctrl+DOWN`

---
 .../themeeditor/FlatSyntaxTextArea.java       |  5 ++
 .../FlatSyntaxTextAreaActions.java            | 59 +++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatSyntaxTextArea.java b/flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatSyntaxTextArea.java
index ef9cf0f5..3fc8de9f 100644
--- a/flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatSyntaxTextArea.java
+++ b/flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatSyntaxTextArea.java
@@ -34,6 +34,7 @@ import org.fife.ui.rtextarea.RTextArea;
 import org.fife.ui.rtextarea.RTextAreaUI;
 import com.formdev.flatlaf.UIDefaultsLoaderAccessor;
 import com.formdev.flatlaf.themeeditor.FlatSyntaxTextAreaActions.DuplicateLinesAction;
+import com.formdev.flatlaf.themeeditor.FlatSyntaxTextAreaActions.IncrementNumberAction;
 
 /**
  * A text area that supports editing FlatLaf themes.
@@ -60,6 +61,8 @@ class FlatSyntaxTextArea
 		ActionMap actionMap = getActionMap();
 		actionMap.put( FlatSyntaxTextAreaActions.duplicateLinesUpAction, new DuplicateLinesAction( FlatSyntaxTextAreaActions.duplicateLinesUpAction, true ) );
 		actionMap.put( FlatSyntaxTextAreaActions.duplicateLinesDownAction, new DuplicateLinesAction( FlatSyntaxTextAreaActions.duplicateLinesDownAction, false ) );
+		actionMap.put( FlatSyntaxTextAreaActions.incrementNumberAction, new IncrementNumberAction( FlatSyntaxTextAreaActions.incrementNumberAction, true ) );
+		actionMap.put( FlatSyntaxTextAreaActions.decrementNumberAction, new IncrementNumberAction( FlatSyntaxTextAreaActions.decrementNumberAction, false ) );
 
 		// add editor key strokes
 		InputMap inputMap = getInputMap();
@@ -67,6 +70,8 @@ class FlatSyntaxTextArea
 		int alt = InputEvent.ALT_DOWN_MASK;
 		inputMap.put( KeyStroke.getKeyStroke( KeyEvent.VK_UP,   defaultModifier|alt), FlatSyntaxTextAreaActions.duplicateLinesUpAction );
 		inputMap.put( KeyStroke.getKeyStroke( KeyEvent.VK_DOWN, defaultModifier|alt), FlatSyntaxTextAreaActions.duplicateLinesDownAction );
+		inputMap.put( KeyStroke.getKeyStroke( KeyEvent.VK_UP,   defaultModifier), FlatSyntaxTextAreaActions.incrementNumberAction );
+		inputMap.put( KeyStroke.getKeyStroke( KeyEvent.VK_DOWN, defaultModifier), FlatSyntaxTextAreaActions.decrementNumberAction );
 	}
 
 	@Override
diff --git a/flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatSyntaxTextAreaActions.java b/flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatSyntaxTextAreaActions.java
index 308f12e2..60d76f90 100644
--- a/flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatSyntaxTextAreaActions.java
+++ b/flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatSyntaxTextAreaActions.java
@@ -28,6 +28,10 @@ class FlatSyntaxTextAreaActions
 {
 	static final String duplicateLinesUpAction = "FlatLaf.DuplicateLinesUpAction";
 	static final String duplicateLinesDownAction = "FlatLaf.DuplicateLinesDownAction";
+	static final String incrementNumberAction = "FlatLaf.IncrementNumberAction";
+	static final String decrementNumberAction = "FlatLaf.DecrementNumberAction";
+
+	//---- class DuplicateLinesAction -----------------------------------------
 
 	static class DuplicateLinesAction
 		extends RecordableTextAction
@@ -73,4 +77,59 @@ class FlatSyntaxTextAreaActions
 			return getName();
 		}
 	}
+
+	//---- class IncrementNumberAction ----------------------------------------
+
+	static class IncrementNumberAction
+		extends RecordableTextAction
+	{
+		private final boolean increment;
+
+		IncrementNumberAction( String name, boolean increment ) {
+			super( name );
+			this.increment = increment;
+		}
+
+		@Override
+		public void actionPerformedImpl( ActionEvent e, RTextArea textArea ) {
+			try {
+				int caretPosition = textArea.getCaretPosition();
+				int start = caretPosition;
+				int end = caretPosition;
+				for( int i = caretPosition - 1; i >= 0; i-- ) {
+					if( !Character.isDigit( textArea.getText( i, 1 ).charAt( 0 ) ) )
+						break;
+					start = i;
+				}
+				int length = textArea.getDocument().getLength();
+				for( int i = caretPosition; i < length; i++ ) {
+					if( !Character.isDigit( textArea.getText( i, 1 ).charAt( 0 ) ) )
+						break;
+					end = i + 1;
+				}
+
+				if( start == end )
+					return;
+
+				String str = textArea.getText( start, end - start );
+				long number = Long.parseLong( str );
+				if( increment )
+					number++;
+				else
+					number--;
+
+				if( number < 0 )
+					return;
+
+				textArea.replaceRange( Long.toString( number ), start, end );
+			} catch( BadLocationException | IndexOutOfBoundsException | NumberFormatException ex ) {
+				ex.printStackTrace();
+			}
+		}
+
+		@Override
+		public String getMacroID() {
+			return getName();
+		}
+	}
 }