macOS Gestures: what changed
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Title: macOS Gestures
| Old | New | Line | |
|---|---|---|---|
| 1 | + | *(macOS only)* | |
| 2 | + | ||
| 3 | + | ## Overview | |
| 4 | + | ||
| 5 | + | The Gestures unit provides convenient Free Pascal classes for handling macOS gestures. | |
| 6 | + | ||
| 7 | + | Currently only the magnification gesture is implemented, but others can be implemented easily in a similar way. | |
| 8 | + | ||
| 9 | + | ## Usage Example | |
| 10 | + | ||
| 11 | + | Let's assume your scalable control has a Scale property and you want to allow an end user to scale it by using the typical trackpad gesture. Here is the code: | |
| 12 | + | ||
| 13 | + | ``` pascal | |
| 14 | + | uses | |
| 15 | + | Gestures; | |
| 16 | + | ||
| 17 | + | type | |
| 18 | + | TForm_Main = class(TForm) | |
| 19 | + | private | |
| 20 | + | Gesture: TMagnificationGesture; | |
| 21 | + | InitialScale: Double; | |
| 22 | + | end; | |
| 23 | + | ||
| 24 | + | procedure TForm_Main.FormCreate(Sender: TObject); | |
| 25 | + | begin | |
| 26 | + | Gesture := TMagnificationGesture.Create(Self); | |
| 27 | + | Gesture.Control := MyScalableControl; | |
| 28 | + | Gesture.OnGesture := @MagnificationGestureGesture; | |
| 29 | + | end; | |
| 30 | + | ||
| 31 | + | procedure TForm_Main.MagnificationGestureGesture(Sender: TMagnificationGesture; | |
| 32 | + | State: TGestureState; Magnification: Double); | |
| 33 | + | begin | |
| 34 | + | case State of | |
| 35 | + | gsBegan: | |
| 36 | + | InitialScale := MyScalableControl.Scale; | |
| 37 | + | ||
| 38 | + | gsChanged: | |
| 39 | + | if Magnification > 0 then | |
| 40 | + | MyScalableControl.Scale := InitialScale * (1 + Magnification) | |
| 41 | + | else | |
| 42 | + | MyScalableControl.Scale := InitialScale / (1 - Magnification); | |
| 43 | + | end; | |
| 44 | + | end; | |
| 45 | + | ``` | |
| 46 | + | ||
| 47 | + | ## Author | |
| 48 | + | ||
| 49 | + | Yuri Plashenkov | |
| 50 | + | ||
| 51 | + | ## License | |
| 52 | + | ||
| 53 | + | This package is licensed under the [MIT license](https://github.com/plashenkov/macOS-gestures-FPC/blob/main/LICENSE.md). | |
| 54 | + | ||
| 55 | + | ## Download | |
| 56 | + | ||
| 57 | + | The Gestures unit may be downloaded from [GitHub](https://github.com/plashenkov/macOS-gestures-FPC). | |
| 58 | + | ||
| 59 | + | ## External links | |
| 60 | + | ||
| 61 | + | - [Apple: Trackpad gestures](https://support.apple.com/en-au/HT204895) | |
| 62 | + | - [Apple: Gestures](https://developer.apple.com/documentation/appkit/gestures) | |
| 63 | + | ||
| 64 | + | --- | |
| 65 | + | *From the Free Pascal wiki, page "macOS Gestures", as it stood on 2020-11-29 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 |