Carbon interface internals
│ Deutsch (de) │ English (en) │
This article applies to macOS only.
See also: Multiplatform Programming Guide
This article applies to iOS only.
See also: Multiplatform Programming Guide
This page gives an overview of the LCL carbon interface for Mac OS X and will help new developers.
For installation and creating a first carbon application read first Carbon Interface.
Documentation about Carbon
Carbon interface development basics
- Target Mac OS X version is 10.4
- Avoid using obsolete or deprecated APIs and functions (e. g. QuickDraw vs. Quartz 2D)
What is already working ?
- Creating a TForm
- Creating and clicking on a TButton
- Creating and editing a TEdit
- Creating and clicking on a TGroupBox
- Creating and clicking on a TCheckBox
- Creating a TStaticText
- Creating a TTimer
- Creating TOpenGLControl with AGL context (see components/opengl/)
- Mouse events
- Keyboard events (VK_ mapping for foreign keyboards needs testing)
What needs to be done next?
Item | Note | Dependencies | Responsible |
---|---|---|---|
TControl.Cursor | SetThemeCursor | ||
TComboBox | HIComboBox(Create) | ||
TListBox | CreateListBoxControl | ||
TCanvas | Quartz 2D, CGContext | Tombo | |
TPen | Quartz 2D | Tombo | |
TBrush | Quartz 2D | Tombo | |
SaveDC, RestoreDC | Quartz 2D, CGContextSaveGState, CGContextRestoreGState | Tombo | |
TBitmap.LoadFromFile | Quartz 2D, CGImage | GetDescriptionFromDevice, CreateBitmapFromRawImage, GetObject | Tombo |
TColorDialog | Color Picker Manager | Tombo | |
TButton.Default indication | kControlPushButtonDefaultTag | Tombo | |
TBitBtn | CreateBevelButtonControl | Tombo | |
TCustomControl | |||
TGraphicControl | MoveWindowOrgEx, IntersectClipRect, SaveDC, RestoreDC | ||
ScreenDC | CGDisplayCapture, CGDisplayGetDrawingContext, CGDisplayRegisterReconfigurationCallback | ||
Hints | CreateNewWindow with kHelpWindowClass | WindowFromPoint |
Bugs
Item | Note | Dependencies | Responsible |
---|---|---|---|
Mouse events fired on structure part of TForm | |||
ShowWindow | Maximize <-> Restore is breaked | ||
TScrollBar and TTrackBar live tracking | |||
TScrollBar arrow clicking | |||
TCustomEdit.MaxLength | The caret pos is not preserved when typed text is longer than maxlength | Tombo | |
TMemo.ReadOnly | |||
TMemo.WordWrap | |||
TMemo is not scrolling to caret | |||
TMemo.ScrollBars | Embed in HIScrollView -> solve event handling | ||
EnumFontFamiliesEx, FindCarbonFontID | Get UTF-8 font names | UTF16ToUTF8 | Tombo |
TCustomCheckBox.OnClick | Called before state is changed -> toggle manually | Tombo | |
TForm.ShowModal | Problem with repeated calling | Tombo |
Compatibility issues
Keyboard
- Apple Command key is mapped to ssCtrl due to Apple Guidelines
- Apple control key is mapped to ssMeta
- Apple option key is mapped to its inscription, i.e. ssAlt
- Shortcuts indication (ampersand)
Drawing on canvas outside OnPaint event
- paints into QuickDraw window port, maybe QDBeginCGContext, QDEndCGContext would help
How to add a new control
For example TButton.
TButton is defined in lcl/buttons.pp. This is the platform independent part of the LCL, which is used by the normal LCL programmer.
Its widgetset class is in lcl/widgetset/wsbuttons.pp. This is the platform independent base for all widgetsets (carbon, gtk, win32, ...).
Its carbon interface class is in lcl/interfaces/carbon/carbonwsbuttons.pp:
TCarbonWSButton = class(TWSButton) private protected public class function CreateHandle(const AWinControl: TWinControl; const AParams: TCreateParams): TLCLIntfHandle; override; end;
Every WS class, that actually implements something must be registered. See the initialization section at the end of the carbonwsXXX.pp unit:
RegisterWSComponent(TCustomButton, TCarbonWSButton);
TCarbonWSButton overrides CreateHandle to create a carbon button. The code is short and should be easily adaptable for other controls like TCheckBox.