api:dk11:delphi:fmx.giscontrolprintpreview.tgis_controlprintpreviewform.preview_tgis_printmanagerabstract_string_double
Table of Contents
TGIS_ControlPrintPreviewForm.Preview method
DK for Delphi | FMX.GisControlPrintPreview.TGIS_ControlPrintPreviewForm.Preview | Constructors | Methods | Properties | Events
Show the print preview form and start preview generation.
Available also on: .NET WinForms | Java.
Syntax
// Delphi public procedure Preview( const _printManager : TGIS_PrintManagerAbstract; const _customPage : String; var _scale : Double );
// C++ Builder public: void Preview( TGIS_PrintManagerAbstract* const _printManager, const UnicodeString _customPage, double &_scale );
Parameters
| Name | Type | Description |
|---|---|---|
| _printManager | TGIS_PrintManagerAbstract | Print manager used to generate and print preview pages. |
| _customPage | String | Custom page definition passed to the print manager. |
| _scale | Double | Scale factor used for printing; if _scale = 0, the scale is calculated automatically to fit the printed extent. |
Remarks
PURPOSE: Displays the preview form for the specified print manager and initializes preview state, including custom page settings and print scale handling.
BEHAVIOR: Opens the FMX preview user interface and starts previewing from the current page state. The scale value can be updated by the preview workflow when automatic fitting is used.
CONSTRAINTS: Printing and preview generation fail when GIS_Viewer.InPaint is True. Preview page numbering is 1-based, where page 1 is the first page.
2026/07/11 00:18