Merge PR MacDownApp#1364: Cmd+/Cmd- zoom shortcuts (adapted to WKWebView pageZoom)

Author: macnotes

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

MacDown/Code/Document/MPDocument.m

@@ -1788,9 +1788,6 @@ - (void)updatePreviewBackgroundColorCache
 
 - (void)scaleWebview
 {
-    if (!self.preferences.previewZoomRelativeToBaseFontSize)
-        return;
-
     CGFloat fontSize = self.preferences.editorBaseFontSize;
     if (fontSize <= 0.0)
         return;
@@ -1803,6 +1800,24 @@ - (void)scaleWebview
     self.preview.pageZoom = scale;
 }
 
+- (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)updateHeaderLocationsWithCompletion:(void (^)(void))completion
 {
     // Cache the locations of all of the reference nodes in the editor view.

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>