Using SftButton/OCX with Delphi
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Using SftButton/OCX with Delphi |
This section describes how SftButton/OCX is typically used with Delphi 7 and other, older versions of Delphi. For information on how to use this product with more recent Delphi versions, such as Delphi 2007, please see "Using SftButton/OCX with Delphi 2005 And Newer".
Adding SftButton/OCX To Delphi
Adding SftButton/OCX To A Project
Special Considerations
- Picture Properties
- Color Properties
- Object vs. Interface
The SftButton/OCX control must be added to the Component Palette before it can be used in a project.
The control is added to the Component Palette using the Component, Import ActiveX Control... menu command, which displays the following dialog:
Select the control "SftButton/OCX 2.5 Button Control (Version 2.5)" by highlighting it and click "Install...".
In the resulting dialog you are prompted to save the definition into a new or existing package. Enter a suitable new package name or select an existing package name (such as "Borland User Components") and click OK.
Click Yes once you are prompted to build and install the new package.
Now the control has been added to the Component Palette under the ActiveX tab. If an error message is displayed instead, the product SftButton/OCX is not correctly installed or the control may have been unregistered accidentally. Quit Delphi and use the entry Maintenance, Register SftButton OCX in Windows Registry in the SftButton/OCX 2.5 program group to register the control. Restart Delphi and try to add the control to the Component Palette again.
After the control has been added to the Delphi Component Palette, the Imports directory in the Delphi product location contains the file SftButtonLib25_TLB.pas. This file has been generated by Delphi and contains all property and method definitions. The generated file should be used as a reference. Please note that the Pascal definitions are generated by Delphi and are not part of SftButton/OCX.
This adds the following SftButton/OCX controls to the Component Palette.
for
use with Delphi (and other
development tools)
for
use with other development tools (do
not use with Delphi)If the icon appears with a small "e" in the top left corner as shown on the right, you have accidentally added the wrong control to the Component Palette. This control is specific to Internet Explorer and HTML pages. Remove the control, then add the correct control by following the above instructions. |
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Now the control can be added to a form by clicking on the SftButton/OCX button of the Component Palette (ActiveX tab).
All required steps have now been completed to use SftButton/OCX.
For a complete example, add the following sample code to initialize the control:
procedure TForm1.FormCreate(Sender: TObject);
begin
SftButton1.Text := 'Click Me';
SftButton1.ShowDropDown := True;
end;
In this example, the control is initialized at run-time using code. Of course it is also possible (and much easier) to set up all properties using the property pages. You can access the property pages by right-clicking on the control and select the Properties... entry of the popup menu.
You can run the sample application and it displays a SftButton/OCX with a drop down button.
After adding the control to the form, right click on the control and select the Properties... entry of the popup menu. This displays the Property Dialog for the control.
Please note that you can right-click on a property in a Property Dialog or double-click on the description of a property to access its complete help information.
This control has many properties and methods which you can use. This is a very simple example and doesn't even begin to exploit the capabilities of this control. Please take a moment to familiarize yourself with the objects offered by the SftButton/OCX control. Each object represents a specific area of the control and can be fully customized. Also make sure to run the demo which is included with this product and take a look at the included samples.
When adding SftButton/OCX to a project, Delphi generates a class wrapper to fully support an ActiveX control such as SftButton/OCX. After the control has been added to the Delphi Tool Palette, your package (defined above) contains the file SftButtonLib25_TLB.pas. This file has been generated by Delphi and contains all property and method definitions. The generated file should be used as a reference. Please note that the Pascal definitions are generated by Delphi and are not part of SftButton/OCX.
While some graphics properties are generated to use a TPicture type, some properties and methods do not. These use the OLE picture type IPictureDisp instead, which cannot directly be used with a TPicture type. The Syntax portion of each method, property and event shows the full syntax and required picture type (TPicture or IPictureDisp).
The TPicture type can easily be converted into an IPictureDisp type using Delphi's GetOlePicture function.
The Syntax section of picture properties typically shows Get, Put and PutRef forms. If both Put and PutRef are available, PutRef is the preferred form as it conserves resources and assigns a picture object reference to the control. Put causes the control to completely copy the picture object.
Color properties (without parameters) of the SftButton object use the Delphi TColor type, but all other properties and objects (such as SftPictureObject, etc.) use the Cardinal type. Converting a Delphi TColor type to a Cardinal (OLE color value) is easily accomplished using the Cardinal conversion.
The valid range for a color value is 0 to 16,777,215 ($00ffffff). The high order byte of a number in this range equals 0; the lower 3 bytes, from least to most significant byte, determine the amount of red, green, and blue, respectively. The red, green, and blue components are each represented by a number between 0 and 255 ($FF). If the high byte is not 0, the system colors as defined in Control Panel's settings are used. The Windows API GetSysColor defines all valid constants. Please see your development environment's documentation for applicable color constants.
The Syntax portion of each method and property shows whether a TColor type or an OLE color of type Cardinal is used.
TColor Type
var c : TColor;
SftButton1.BackColor := clHighlight; SftButton1.BackColor := clRed; SftButton1.BackColor := $000000FF; // red
c := SftButton1.BackColor;
OLE Color Value
var c : TColor;
SftButton1.Image1.SampleColor := Cardinal(clHighlight); SftButton1.Image1.SampleColor := Cardinal(clRed); SftButton1.Image1.SampleColor := $000000FF; // red
c := SftButton1.Image1.SampleColor;
The main control is represented by an object of the TSftButton class, but can also be represented by its ISftButton interface. The ISftButton interface can be retrieved using the Direct property.
Certain methods and properties have different names and return types, based on how they are accessed. While (for example) an object based on the TSftButton class is mostly equivalent to the ISftButton interface exposed by the control, Delphi can introduce minor differences. Such differences are shown in the Syntax section of the affected methods and properties. All other objects are identical to their interfaces and no distinction is made.
The Syntax portion shows both forms, the class member and the interface method (the interface method is always marked with a Note indicator). If both forms are identical, only one entry is shown.
Some properties (particularly font and picture properties) may require different types. For example, the Font property accepts a TFont object when accessed through a TSftButton class object, but uses a IFontDisp interface pointer when accessed directly though the ISftButton interface pointer. IFontDisp can be provided using the GetOLEFont function.