From b8c94332590e8326af6bbb4b4d33d930631e944b Mon Sep 17 00:00:00 2001
From: Karl Tauber <karl@jformdesigner.com>
Date: Mon, 2 Nov 2020 12:13:06 +0100
Subject: [PATCH] SplitPane: added tooltips to expand/collapse buttons (issue
 #198)

---
 CHANGELOG.md                                  |  3 ++-
 .../formdev/flatlaf/ui/FlatSplitPaneUI.java   | 23 +++++++++++++++++++
 .../flatlaf/resources/Bundle.properties       | 12 ++++++++++
 3 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c3a05f91..6d911aec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,7 +36,8 @@ FlatLaf Change Log
   `TitlePane.borderColor`). (issue #184)
 - Extras: `FlatSVGIcon` now allows specifying icon width and height in
   constructors. (issue #196)
-- SplitPane: Hide not applicable expand/collapse buttons. (issue #198)
+- SplitPane: Hide not applicable expand/collapse buttons. Added tooltips to
+  expand/collapse buttons. (issue #198)
 
 
 #### Fixed bugs
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatSplitPaneUI.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatSplitPaneUI.java
index a1859c01..93608e10 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatSplitPaneUI.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatSplitPaneUI.java
@@ -20,11 +20,13 @@ import java.awt.Color;
 import java.awt.Container;
 import java.awt.Cursor;
 import java.awt.Insets;
+import java.awt.event.MouseEvent;
 import java.beans.PropertyChangeEvent;
 import javax.swing.JButton;
 import javax.swing.JComponent;
 import javax.swing.JSplitPane;
 import javax.swing.SwingConstants;
+import javax.swing.ToolTipManager;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicSplitPaneDivider;
@@ -152,6 +154,7 @@ public class FlatSplitPaneUI
 			protected FlatOneTouchButton( boolean left ) {
 				super( SwingConstants.NORTH, arrowType, oneTouchArrowColor, null, oneTouchHoverArrowColor, null );
 				setCursor( Cursor.getPredefinedCursor( Cursor.DEFAULT_CURSOR ) );
+				ToolTipManager.sharedInstance().registerComponent( this );
 
 				this.left = left;
 			}
@@ -162,6 +165,26 @@ public class FlatSplitPaneUI
 					? (left ? SwingConstants.NORTH : SwingConstants.SOUTH)
 					: (left ? SwingConstants.WEST : SwingConstants.EAST);
 			}
+
+			@Override
+			public String getToolTipText( MouseEvent e ) {
+				String key = (orientation == JSplitPane.VERTICAL_SPLIT)
+					? (left
+						? (isRightCollapsed()
+							? "SplitPaneDivider.expandBottomToolTipText"
+							: "SplitPaneDivider.collapseTopToolTipText")
+						: (isLeftCollapsed()
+							? "SplitPaneDivider.expandTopToolTipText"
+							: "SplitPaneDivider.collapseBottomToolTipText"))
+					: (left
+						? (isRightCollapsed()
+							? "SplitPaneDivider.expandRightToolTipText"
+							: "SplitPaneDivider.collapseLeftToolTipText")
+						: (isLeftCollapsed()
+							? "SplitPaneDivider.expandLeftToolTipText"
+							: "SplitPaneDivider.collapseRightToolTipText"));
+				return UIManager.getString( key, getLocale() );
+			}
 		}
 
 		//---- class FlatDividerLayout ----------------------------------------
diff --git a/flatlaf-core/src/main/resources/com/formdev/flatlaf/resources/Bundle.properties b/flatlaf-core/src/main/resources/com/formdev/flatlaf/resources/Bundle.properties
index fa1d20fc..06caf173 100644
--- a/flatlaf-core/src/main/resources/com/formdev/flatlaf/resources/Bundle.properties
+++ b/flatlaf-core/src/main/resources/com/formdev/flatlaf/resources/Bundle.properties
@@ -48,6 +48,18 @@ FileChooser.listViewActionLabelText=List
 FileChooser.detailsViewActionLabelText=Details
 
 
+#---- SplitPaneDivider ----
+
+SplitPaneDivider.collapseLeftToolTipText=Collapse Left Pane
+SplitPaneDivider.collapseRightToolTipText=Collapse Right Pane
+SplitPaneDivider.collapseTopToolTipText=Collapse Top Pane
+SplitPaneDivider.collapseBottomToolTipText=Collapse Bottom Pane
+SplitPaneDivider.expandLeftToolTipText=Expand Left Pane
+SplitPaneDivider.expandRightToolTipText=Expand Right Pane
+SplitPaneDivider.expandTopToolTipText=Expand Top Pane
+SplitPaneDivider.expandBottomToolTipText=Expand Bottom Pane
+
+
 #---- TabbedPane ----
 
 TabbedPane.moreTabsButtonToolTipText=Show Hidden Tabs