From 7e2453190658529fee2d710aabc57f5f3f968c05 Mon Sep 17 00:00:00 2001
From: wp_xxyyzz <wp_xxyyzz@8e941d3f-bd1b-0410-a28a-d453659cc2b4>
Date: Sat, 12 Nov 2022 23:35:27 +0000
Subject: [PATCH] GridPrinter: Add properties to TGridPrintPreviewDialog to
 determine preview form size and position, as well as initial zoom.

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@8616 8e941d3f-bd1b-0410-a28a-d453659cc2b4
---
 .../examples/multi-language/main.lfm          |  4 +
 .../gridprinter/source/gridprnpreviewdlg.pas  | 73 ++++++++++++++++++-
 .../gridprinter/source/gridprnpreviewform.pas |  2 +-
 3 files changed, 76 insertions(+), 3 deletions(-)

diff --git a/components/gridprinter/examples/multi-language/main.lfm b/components/gridprinter/examples/multi-language/main.lfm
index 8fc3348b0..403932aee 100644
--- a/components/gridprinter/examples/multi-language/main.lfm
+++ b/components/gridprinter/examples/multi-language/main.lfm
@@ -155,7 +155,11 @@ object MainForm: TMainForm
     Top = 96
   end
   object GridPrintPreviewDialog1: TGridPrintPreviewDialog
+    FormParams.Width = 840
+    FormParams.Height = 800
+    FormParams.Position = poDesigned
     GridPrinter = GridPrinter1
+    Zoom = gpzZoomHeight
     Left = 288
     Top = 96
   end
diff --git a/components/gridprinter/source/gridprnpreviewdlg.pas b/components/gridprinter/source/gridprnpreviewdlg.pas
index a0ef21b85..bf6583d4b 100644
--- a/components/gridprinter/source/gridprnpreviewdlg.pas
+++ b/components/gridprinter/source/gridprnpreviewdlg.pas
@@ -5,38 +5,87 @@ unit GridPrnPreviewDlg;
 interface
 
 uses
-  Classes, SysUtils, GridPrn, GridPrnPreviewForm;
+  Classes, SysUtils, Forms, GridPrn, GridPrnPreviewForm;
 
 type
+  TGridPrintPreviewDialog = class;  // forward declaration
+
+  TGridPrintPreviewZoom = (gpzOriginal, gpzZoomWidth, gpzZoomHeight);
+
+  TGridPrintPreviewFormParams = class(TPersistent)
+  private
+    FOwner: TGridPrintPreviewDialog;
+    FLeft: Integer;
+    FTop: Integer;
+    FWidth: Integer;
+    FHeight: Integer;
+    FPosition: TPosition;
+  public
+    constructor Create(AOwner: TGridPrintPreviewDialog);
+  published
+    property Left: Integer read FLeft write FLeft default 0;
+    property Top: Integer read FTop write FTop default 0;
+    property Width: Integer read FWidth write FWidth default 800;
+    property Height: Integer read FHeight write FHeight default 600;
+    property Position: TPosition read FPosition write FPosition default poMainFormCenter;
+  end;
+
   TGridPrintPreviewDialog = class(TComponent)
   private
     FGridPrinter: TGridPrinter;
+    FFormParams: TGridPrintPreviewFormParams;
     FOptions: TGridPrintPreviewOptions;
+    FZoom: TGridPrintPreviewZoom;
   protected
     procedure Notification(AComponent: TComponent; Operation: TOperation); override;
   public
     constructor Create(AOwner: TComponent); override;
+    destructor Destroy; override;
     procedure Execute;
   published
+    property FormParams: TGridPrintPreviewFormParams read FFormParams write FFormParams;
     property GridPrinter: TGridPrinter read FGridPrinter write FGridPrinter;
     property Options: TGridPrintPreviewOptions
       read FOptions write FOptions default DEFAULT_GRIDPRN_OPTIONS;
+    property Zoom: TGridPrintPreviewZoom read FZoom write FZoom default gpzOriginal;
   end;
 
 implementation
 
 uses
-  Controls;
+  Controls, LCLIntf, LCLType;
+
+{ TGridPrintPreviewFormParams }
+
+constructor TGridPrintPreviewFormParams.Create(AOwner: TGridPrintPreviewDialog);
+begin
+  inherited Create;
+  FOwner := AOwner;
+  FWidth := 800;
+  FHeight := 600;
+  FPosition := poMainFormCenter;
+end;
+
+
+{ TGridPrintPreviewDialog }
 
 constructor TGridPrintPreviewDialog.Create(AOwner: TComponent);
 begin
   inherited;
   FOptions := DEFAULT_GRIDPRN_OPTIONS;
+  FFormParams := TGridPrintPreviewFormParams.Create(self);
+end;
+
+destructor TGridPrintPreviewDialog.Destroy;
+begin
+  FFormParams.Free;
+  inherited;
 end;
 
 procedure TGridPrintPreviewDialog.Execute;
 var
   F: TGridPrintPreviewForm;
+  R: TRect;
 begin
   if FGridPrinter = nil then
     exit;
@@ -45,8 +94,28 @@ begin
   try
     F.GridPrinter := FGridPrinter;
     F.Options := FOptions;
+    R := Screen.WorkAreaRect;
+    if FFormParams.Width > R.Width then FFormParams.Width := R.Width;
+    if FFormParams.Height > R.Height then FFormParams.Height := R.Height;
+    if FFormParams.Left < R.Left then FFormParams.Left := R.Left;
+    if FFormParams.Top < R.Top then FFormParams.Top := R.Top;
+    if FFormParams.Left + FFormParams.Width > R.Right then
+      FFormParams.Left := R.Right - FFormParams.Width - GetSystemMetrics(SM_CXSIZEFRAME);
+    if FFormParams.Top + FFormParams.Height > R.Bottom then
+      FFormParams.Top := R.Bottom - FFormParams.Height - GetSystemMetrics(SM_CYCAPTION) - GetSystemMetrics(SM_CYSIZEFRAME);
+    F.SetBounds(FFormParams.Left, FFormParams.Top, FFormParams.Width, FFormParams.Height);
+    F.Position := FFormParams.Position;
+    case FZoom of
+      gpzOriginal: F.acZoom100.Checked := true;
+      gpzZoomWidth: F.ZoomToFitWidth;
+      gpzZoomHeight: F.ZoomToFitHeight;
+    end;
     if (F.ShowModal = mrOK) then
       FGridPrinter.Print;
+    FFormParams.Left := F.RestoredLeft;
+    FFormParams.Top := F.RestoredTop;
+    FFormParams.Width := F.RestoredWidth;
+    FormParams.Height := F.RestoredHeight;
   finally
     F.Free;
   end;
diff --git a/components/gridprinter/source/gridprnpreviewform.pas b/components/gridprinter/source/gridprnpreviewform.pas
index a0c463770..05c39af27 100644
--- a/components/gridprinter/source/gridprnpreviewform.pas
+++ b/components/gridprinter/source/gridprnpreviewform.pas
@@ -492,7 +492,7 @@ begin
   if FActivated then
     exit;
   FUpdatePreviewHandler := FGridPrinter.OnUpdatePreview;
-  ShowPage(1, 100);
+  ShowPage(1);
   FActivated := true;
 end;