feat: add width option to dialog.showMessageBox() (#31089)

Co-authored-by: Milan Burda <[email protected]>

docs/api/dialog.md

@@ -234,6 +234,7 @@ expanding and collapsing the dialog.
   * `title` String (optional) - Title of the message box, some platforms will not show it.
   * `detail` String (optional) - Extra information of the message.
   * `icon` ([NativeImage](native-image.md) | String) (optional)
+  * `textWidth` Integer (optional) _macOS_ - Custom width of the text in the message box.
   * `cancelId` Integer (optional) - The index of the button to be used to cancel the dialog, via
     the `Esc` key. By default this is assigned to the first button with "cancel" or "no" as the
     label. If no such labeled buttons exist and this option is not set, `0` will be used as the
@@ -285,6 +286,7 @@ If `browserWindow` is not shown dialog will not be attached to it. In such case
   * `checkboxChecked` Boolean (optional) - Initial checked state of the
     checkbox. `false` by default.
   * `icon` [NativeImage](native-image.md) (optional)
+  * `textWidth` Integer (optional) _macOS_ - Custom width of the text in the message box.
   * `cancelId` Integer (optional) - The index of the button to be used to cancel the dialog, via
     the `Esc` key. By default this is assigned to the first button with "cancel" or "no" as the
     label. If no such labeled buttons exist and this option is not set, `0` will be used as the

lib/browser/api/dialog.ts

@@ -168,6 +168,7 @@ const messageBox = (sync: boolean, window: BrowserWindow | null, options?: Messa
     defaultId = -1,
     detail = '',
     icon = null,
+    textWidth = 0,
     noLink = false,
     message = '',
     title = '',
@@ -225,7 +226,8 @@ const messageBox = (sync: boolean, window: BrowserWindow | null, options?: Messa
     detail,
     checkboxLabel,
     checkboxChecked,
-    icon
+    icon,
+    textWidth
   };
 
   if (sync) {

shell/browser/ui/message_box.h

@@ -38,6 +38,7 @@ struct MessageBoxSettings {
   std::string checkbox_label;
   bool checkbox_checked = false;
   gfx::ImageSkia icon;
+  int text_width = 0;
 
   MessageBoxSettings();
   MessageBoxSettings(const MessageBoxSettings&);

shell/browser/ui/message_box_mac.mm

@@ -98,6 +98,12 @@ NSAlert* CreateNSAlert(const MessageBoxSettings& settings) {
     [alert setIcon:image];
   }
 
+  if (settings.text_width > 0) {
+    NSRect rect = NSMakeRect(0, 0, settings.text_width, 0);
+    NSView* accessoryView = [[NSView alloc] initWithFrame:rect];
+    [alert setAccessoryView:[accessoryView autorelease]];
+  }
+
   return alert;
 }
 

shell/common/gin_converters/message_box_converter.cc

@@ -32,6 +32,7 @@ bool Converter<electron::MessageBoxSettings>::FromV8(
   dict.Get("noLink", &out->no_link);
   dict.Get("checkboxChecked", &out->checkbox_checked);
   dict.Get("icon", &out->icon);
+  dict.Get("textWidth", &out->text_width);
   return true;
 }