VCL.Controls Sample

This sample demonstrates how to create and use custom VCL components. The application proves that you can easily modify the implementation for controls that already exist on the palette.

Location

You can find the Controls sample project at:

• Start | Programs | Embarcadero RAD Studio Sydney | Samples and then navigate to CPP\VCL\Controls.
• C:\Users\Public\Documents\Embarcadero\Studio\21.0\Samples\CPP\VCL\Controls.
• Subversion Repository:
  • You can find C++ code samples in GitHub Repositories. Search by name into the samples repositories according to your RAD Studio version.

Description

The application creates and installs the C++ version of the visual components that already exist in the Samples category on the Tool Palette, plus some new ones.

These are the new components that this sample application adds to the Tool Palette:

• TCTrayIcon
• TPerformanceGraph
• TCSpinButton
• TCSpinEdit
• TCColorGrid
• TCGauge
• TCDirectoryOutline
• TCCalendar
• TPie

How to Use the Sample

To run the example, complete the following steps:

1. Navigate to the location given above.
2. Load bcbsmp.bpl.
3. Load dclbcbsmp.bpl.(By convention, dcl is the prefix for component designer packages.)
4. Build bcbsmp.bpl.
5. Install dclbcbsmp.bpl to install the components.

Note: In order to be able to install this project, go to Component > Install Packages and deselect Embarcadero Sample Controls Design Time Package.

Files

File	Contains
ccalendr	The TCCalendar class
cdiroutl	The TCDirectoryOutline class
cgauges	The TCGauge class and other helper classes
cgrid	The TCColorGrid class
cspin	The TCSpinButton and TCSpinEdit classes
perfgrap	The TPerformanceGraph class
pies	The TPie class and TAngle helper class
trayicon	The TCTrayIcon class
piereg	The code for registering the TPie component and its property editor
smpreg	The code for registering the rest of the components

Classes

• TCCalendar implements a month calendar; it is a version of TCalendar.
• TCDirectoryOutline implements a directory hierarchy; it is a version of TDirectoryOutline.
• TBltBitmap is a helper class for TCGauge.
• TCGauge implements a measurement tool; it is a version of TGauge.
• TCColorGrid implements a grid that allows the user to select a foreground color and a background color.
• TCSpinButton implements a spin button; it is a version of TSpinButton.
• TCSpinEdit implements a spin edit; it is a version of TSpinEdit.
• TPerformanceGraph implements a performance graph.
• TAngles is a helper class for TPie.
• TPie implements a pie component.
• TCTrayIcon implements a tray icon; it is a version of TTrayIcon.

Uses

• TGraphicControl
• TPropertyEditor
• TComponentEditor
• RegisterComponents
• RegisterPropertyEditor
• RegisterComponentEditor

See Also

• Component Writer's Guide
• Making Components Available at Design Time - Overview