From d5b496fe5ca8562feca921217c01f6df1782374e Mon Sep 17 00:00:00 2001
From: Steve Stonebraker <github@brakertech.com>
Date: Mon, 2 Mar 2026 21:46:04 -0600
Subject: [PATCH] Add Cmd+/Cmd- keyboard shortcuts for zoom

Implements zoom in/out functionality with Cmd+ and Cmd- shortcuts.
Both editor and preview panes scale together.

- Add zoomIn: and zoomOut: IBAction methods to MPDocument
- Add Zoom In/Out menu items to View menu with keyboard shortcuts
- Remove preference check to always scale preview with editor
- Minimum zoom size set to 8pt to prevent unreadable text

Closes #482
---
 MacDown/Code/Document/MPDocument.h           |  3 +++
 MacDown/Code/Document/MPDocument.m           | 22 +++++++++++++++++---
 MacDown/Localization/Base.lproj/MainMenu.xib | 11 ++++++++++
 3 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/MacDown/Code/Document/MPDocument.h b/MacDown/Code/Document/MPDocument.h
index 387f4675..64b39ee8 100644
--- a/MacDown/Code/Document/MPDocument.h
+++ b/MacDown/Code/Document/MPDocument.h
@@ -19,4 +19,7 @@
 @property (nonatomic, readwrite) NSString *markdown;
 @property (nonatomic, readonly) NSString *html;
 
+- (IBAction)zoomIn:(id)sender;
+- (IBAction)zoomOut:(id)sender;
+
 @end
diff --git a/MacDown/Code/Document/MPDocument.m b/MacDown/Code/Document/MPDocument.m
index acbc77ff..054b8b03 100644
--- a/MacDown/Code/Document/MPDocument.m
+++ b/MacDown/Code/Document/MPDocument.m
@@ -1690,9 +1690,6 @@ - (void)redrawDivider
 
 - (void)scaleWebview
 {
-    if (!self.preferences.previewZoomRelativeToBaseFontSize)
-        return;
-
     CGFloat fontSize = self.preferences.editorBaseFontSize;
     if (fontSize <= 0.0)
         return;
@@ -1714,6 +1711,25 @@ - (void)scaleWebview
 #endif
 }
 
+
+- (IBAction)zoomIn:(id)sender
+{
+    NSFont *currentFont = self.preferences.editorBaseFont;
+    CGFloat newSize = currentFont.pointSize + 1.0;
+    NSFont *newFont = [NSFont fontWithName:currentFont.fontName size:newSize];
+    self.preferences.editorBaseFont = newFont;
+    [self scaleWebview];
+}
+
+- (IBAction)zoomOut:(id)sender
+{
+    NSFont *currentFont = self.preferences.editorBaseFont;
+    CGFloat newSize = MAX(currentFont.pointSize - 1.0, 8.0);
+    NSFont *newFont = [NSFont fontWithName:currentFont.fontName size:newSize];
+    self.preferences.editorBaseFont = newFont;
+    [self scaleWebview];
+}
+
 -(void) updateHeaderLocations
 {
     CGFloat offset = NSMinY(self.preview.enclosingScrollView.contentView.bounds);
diff --git a/MacDown/Localization/Base.lproj/MainMenu.xib b/MacDown/Localization/Base.lproj/MainMenu.xib
index ad3ef6c3..eec0fd82 100644
--- a/MacDown/Localization/Base.lproj/MainMenu.xib
+++ b/MacDown/Localization/Base.lproj/MainMenu.xib
@@ -407,6 +407,17 @@
                                 </connections>
                             </menuItem>
                             <menuItem isSeparatorItem="YES" id="QMZ-Ld-Nza"/>
+                            <menuItem title="Zoom In" keyEquivalent="+" id="zIn-01-ABC">
+                                <connections>
+                                    <action selector="zoomIn:" target="-1" id="zIn-02-DEF"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Zoom Out" keyEquivalent="-" id="zOt-01-GHI">
+                                <connections>
+                                    <action selector="zoomOut:" target="-1" id="zOt-02-JKL"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem isSeparatorItem="YES" id="zSp-01-MNO"/>
                             <menuItem title="Enter Full Screen" keyEquivalent="f" id="1gz-YB-DZE">
                                 <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
                                 <connections>