Application disable resize over Dock: what changed
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Title: Application disable resize over Dock
| Old | New | Line | |
|---|---|---|---|
| 1 | + | *(macOS only)* | |
| 2 | + | ||
| 3 | + | On macOS it's often needed to disable app window's resize below OS Dock. But Lazarus forms always resize below it. How to disable this resize? | |
| 4 | + | ||
| 5 | + | 1\) Create TForm.OnConstrainedResize handler for your form. Note, it was not "published" in LCL until LCL 1.7. Create it by hands: | |
| 6 | + | ||
| 7 | + | ``` pascal | |
| 8 | + | TfmMain = class(TForm) | |
| 9 | + | ... | |
| 10 | + | private | |
| 11 | + | ... | |
| 12 | + | procedure FormConstrainedResize(Sender: TObject; var MinWidth, MinHeight, | |
| 13 | + | MaxWidth, MaxHeight: TConstraintSize); | |
| 14 | + | ... | |
| 15 | + | end; | |
| 16 | + | ||
| 17 | + | procedure TfmMain.FormCreate(Sender: TObject); | |
| 18 | + | begin | |
| 19 | + | .. | |
| 20 | + | Self.OnConstrainedResize:= @FormConstrainedResize; | |
| 21 | + | .. | |
| 22 | + | end; | |
| 23 | + | ``` | |
| 24 | + | ||
| 25 | + | 2\) Write code in handler to change MaxHeight, value must be workarea height minus current form's Top. | |
| 26 | + | ||
| 27 | + | ``` pascal | |
| 28 | + | procedure TfmMain.FormConstrainedResize(Sender: TObject; var MinWidth, MinHeight, | |
| 29 | + | MaxWidth, MaxHeight: TConstraintSize); | |
| 30 | + | const | |
| 31 | + | cMinHeight = 200; | |
| 32 | + | var | |
| 33 | + | RWork: TRect; | |
| 34 | + | begin | |
| 35 | + | {$ifndef darwin} exit; {$endif} | |
| 36 | + | RWork:= Screen.PrimaryMonitor.WorkareaRect; | |
| 37 | + | MaxHeight:= Max(cMinHeight, RWork.Bottom - RWork.Top - Top); | |
| 38 | + | end; | |
| 39 | + | ``` | |
| 40 | + | ||
| 41 | + | 3\) Note: handler has side effect. On dragging window by its caption, handler is called too, so window will be resized on moving it too low, near the Dock. | |
| 42 | + | ||
| 43 | + | ## See also | |
| 44 | + | ||
| 45 | + | - [[Bounce Application Icon in Dock]] | |
| 46 | + | - [[Hiding a macOS app from the Dock]] | |
| 47 | + | - [[macOS Application Dock Menu]] | |
| 48 | + | - [[Show Badge on Application Icon in Dock]] | |
| 49 | + | ||
| 50 | + | --- | |
| 51 | + | *From the Free Pascal wiki, page "Application disable resize over Dock", as it stood on 2021-12-15 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).* | |
| 52 | + | Category: Code Snippets | |
| 53 | + | Category: macOS |