macOS Form Position Save and Restore: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: macOS Form Position Save and Restore
| Old | New | Line | |
|---|---|---|---|
| 1 | + | *(macOS only)* | |
| 2 | + | ||
| 3 | + | ## Overview | |
| 4 | + | ||
| 5 | + | Here is a quick, almost code-free method to save the form's position and size using the Mac preferences system. | |
| 6 | + | ||
| 7 | + | The *setFrameAutosaveName* method sets the preferences key name used and loads any previously-saved state. As a result, it is best to call it in a Form's OnShow event handler. There is no need to do anything else and the state of the form's position and size will be saved automatically when the form closes. | |
| 8 | + | ||
| 9 | + | A short example may be found below. Note that you need to give the form a unique name - here I have used Form_123 | |
| 10 | + | ||
| 11 | + | ## Code example | |
| 12 | + | ||
| 13 | + | ``` pascal | |
| 14 | + | unit Unit1; | |
| 15 | + | ||
| 16 | + | {$mode objfpc}{$H+} | |
| 17 | + | {$modeswitch objectivec1} | |
| 18 | + | ||
| 19 | + | interface | |
| 20 | + | ||
| 21 | + | uses | |
| 22 | + | Forms, // needed for main form | |
| 23 | + | CocoaAll; // needed for NSView | |
| 24 | + | ||
| 25 | + | type | |
| 26 | + | ||
| 27 | + | { TForm_123 } | |
| 28 | + | ||
| 29 | + | TForm_123 = class(TForm) | |
| 30 | + | procedure FormShow(Sender: TObject); | |
| 31 | + | private | |
| 32 | + | ||
| 33 | + | public | |
| 34 | + | ||
| 35 | + | end; | |
| 36 | + | ||
| 37 | + | var | |
| 38 | + | Form_123: TForm_123; | |
| 39 | + | ||
| 40 | + | implementation | |
| 41 | + | ||
| 42 | + | {$R *.lfm} | |
| 43 | + | ||
| 44 | + | { TForm_123 } | |
| 45 | + | ||
| 46 | + | procedure TForm_123.FormShow(Sender: TObject); | |
| 47 | + | begin | |
| 48 | + | NSView(Form_123.Handle).window.setFrameAutosaveName(NSSTR(ClassName)); | |
| 49 | + | end; | |
| 50 | + | ||
| 51 | + | end. | |
| 52 | + | ``` | |
| 53 | + | ||
| 54 | + | ## See also | |
| 55 | + | ||
| 56 | + | - [[Mac Preferences Read and Write]] | |
| 57 | + | - [[Mac Preferences and About Menu]] | |
| 58 | + | - [[macOS Programming Tips]] | |
| 59 | + | ||
| 60 | + | ## External links | |
| 61 | + | ||
| 62 | + | - [Apple: setFrameAutosaveName](https://developer.apple.com/documentation/appkit/nswindow/1419509-setframeautosavename) | |
| 63 | + | ||
| 64 | + | --- | |
| 65 | + | *From the Free Pascal wiki, page "macOS Form Position Save and Restore", as it stood on 2021-12-28 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).* | |
| 66 | + | Category: Code Snippets | |
| 67 | + | Category: Platform-sensitive development | |
| 68 | + | Category: macOS |