Custom Drawn Interface

Other Interfaces

• Lazarus known issues (things that will never be fixed) - A list of interface compatibility issues
• Win32/64 Interface - The Windows API (formerly Win32 API) interface for Windows 95/98/Me/2000/XP/Vista/10, but not CE
• Windows CE Interface - For Pocket PC and Smartphones
• Carbon Interface - The Carbon 32 bit interface for macOS (deprecated; removed from macOS 10.15)
• Cocoa Interface - The Cocoa 64 bit interface for macOS
• Qt Interface - The Qt4 interface for Unixes, macOS, Windows, and Linux-based PDAs
• Qt5 Interface - The Qt5 interface for Unixes, macOS, Windows, and Linux-based PDAs
• GTK1 Interface - The gtk1 interface for Unixes, macOS (X11), Windows
• GTK2 Interface - The gtk2 interface for Unixes, macOS (X11), Windows
• GTK3 Interface - The gtk3 interface for Unixes, macOS (X11), Windows
• fpGUI Interface - Based on the fpGUI library, which is a cross-platform toolkit completely written in Object Pascal
• Custom Drawn Interface - A cross-platform LCL backend written completely in Object Pascal inside Lazarus. The Lazarus interface to Android.

Platform specific Tips

• Android Programming - For Android smartphones and tablets
• iPhone/iPod development - About using Objective Pascal to develop iOS applications
• FreeBSD Programming Tips - FreeBSD programming tips
• Linux Programming Tips - How to execute particular programming tasks in Linux
• macOS Programming Tips - Lazarus tips, useful tools, Unix commands, and more...
• WinCE Programming Tips - Using the telephone API, sending SMSes, and more...
• Windows Programming Tips - Desktop Windows programming tips

Interface Development Articles

• Carbon interface internals - If you want to help improving the Carbon interface
• Windows CE Development Notes - For Pocket PC and Smartphones
• Adding a new interface - How to add a new widget set interface
• LCL Defines - Choosing the right options to recompile LCL
• LCL Internals - Some info about the inner workings of the LCL
• Cocoa Internals - Some info about the inner workings of the Cocoa widgetset

Introduction

LCL-CustomDrawn-Android has the following features:

• Backends for X11, Android and Windows and a partially working one for Cocoa, more can be added in the future
• Painting is done completely inside Lazarus without any interference from the native libraries except for text drawing. This assures a complete perfection of the executed drawings in all platforms and a uniform level of supported features
• Only 1 native window is utilized for each form, in the Android backend at the moment this is 1 native window for the entire application
• Utilizes the Lazarus Custom Drawn Controls for implementing the LCL standard controls
• Utilizes as it's painting engine the lcl parts: TLazIntfImage, TRawImage, lazcanvas and lazregions

The LCL-CustomDrawn Backends

LCL-CustomDrawn needs backends to implement the most basic parts of the widgetset. Each backend should implement the following minimal parts:

• TWidgetSet.Run, ProcessMessages, etc
• TForm
• TWinControl with all events
• TTrayIcon

LCL-CustomDrawn-Android

See this page Custom Drawn Interface/Android

TCanvas

TCanvas will be fully non-native in this widgetset.

Windowed visual controls

All Windowed visual controls (TButton, TPageControl, etc) will be based in the Lazarus Custom Drawn Controls

Conditional defines accepted by LCL-CustomDrawn

• VerboseCDPaintProfiler - Adds profiling information to indicate how fast the paint event is processed
• VerboseCDWinAPI - Extended verbose information for LCLIntf calls
• VerboseCDForms - Extended verbose information for TWSCustomForm methods and about the non-native form from customdrawnproc (when utilized)
• VerboseCDEvents - Extended verbose information for native events (for example mouse click, key input, etc). This excludes the paint event
• VerboseCDPaintEvent - Debug info for the paint event
• VerboseCDApplication - Verbose info for App routines from the Widgetset object
• VerboseCDMessages - Verbose info for messages from the operating system (Paint, keyboard, mouse)