For minor alterations, you can access the Preview form using the TppReport.PreviewForm property. If you need to completely replace the previewer in ReportBuilder, take a look at the following article...
----------------------------------------- Article: Creating a Preview Plugin -----------------------------------------
Q: I've followed the tutorials and registered a Preview Form replacement but that did not affect the TppDesigner's Preview workspace.
A: Do not use the form replacement, but rather, there is a different architecture built into the preview form that is registered by default.
You will need to register a TppPreview descendent. The class you register is used to create the preview controls inside the standard print preview form and the designer preview workspace.
Here is an example of creating a simple custom preview that access the viewer its been assigned in order to change the page color. You can also do more advanced operations such as adding and removing buttons and change the behavior of the preview form. Access the inherited controls via. protected properties and override the virtual methods in order to customize behavior.
Open ppPreview.pas and view the TppPreview class as a guide to create a custom preview descendent.
unit MyPreviewPlugin;
interface
uses ppPreview;
type TMyPreviewPlugin = class(TppPreview) public procedure BeforePreview; override;
end;
implementation
uses Graphics;
procedure TMyPreviewPlugin.BeforePreview; begin inherited BeforePreview;
Comments
For minor alterations, you can access the Preview form using the
TppReport.PreviewForm property. If you need to completely replace the
previewer in ReportBuilder, take a look at the following article...
-----------------------------------------
Article: Creating a Preview Plugin
-----------------------------------------
Q: I've followed the tutorials and registered a Preview Form replacement but
that did not affect the TppDesigner's Preview workspace.
A: Do not use the form replacement, but rather, there is a different
architecture built into the preview form that is registered by default.
You will need to register a TppPreview descendent. The class you register
is used to create the preview controls inside the standard print preview
form and the designer preview workspace.
Here is an example of creating a simple custom preview that access the
viewer its been assigned in order to change the page color. You can also do
more advanced operations such as adding and removing buttons and change the
behavior of the preview form. Access the inherited controls via. protected
properties and override the virtual methods in order to customize behavior.
Open ppPreview.pas and view the TppPreview class as a guide to create a
custom preview descendent.
unit MyPreviewPlugin;
interface
uses
ppPreview;
type
TMyPreviewPlugin = class(TppPreview)
public
procedure BeforePreview; override;
end;
implementation
uses
Graphics;
procedure TMyPreviewPlugin.BeforePreview;
begin
inherited BeforePreview;
Viewer.PageColor := clRed;
end;
initialization
TppPreviewPlugIn.Register(TMyPreviewPlugin);
finalization
TppPreviewPlugIn.UnRegister(TMyPreviewPlugin);
end.
--
Regards,
Nico Cizik
Digital Metaphors
http://www.digital-metaphors.com
Nico Cizik
Digital Metaphors
http://www.digital-metaphors.com