GridPrinter: Add demo for usage of OnPrepareCanvas event.

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@8594 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/gridprinter/examples/stringgrid_formatted/formatted_stringgrid_demo.lpi

@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="12"/>
+    <PathDelim Value="\"/>
+    <General>
+      <Flags>
+        <CompatibilityMode Value="True"/>
+      </Flags>
+      <SessionStorage Value="InProjectDir"/>
+      <Title Value="formatted_stringgrid_demo"/>
+      <Scaled Value="True"/>
+      <ResourceType Value="res"/>
+      <UseXPManifest Value="True"/>
+      <XPManifest>
+        <DpiAware Value="True"/>
+      </XPManifest>
+    </General>
+    <BuildModes Count="1">
+      <Item1 Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+      <UseFileFilters Value="True"/>
+    </PublishOptions>
+    <RunParams>
+      <FormatVersion Value="2"/>
+    </RunParams>
+    <RequiredPackages Count="2">
+      <Item1>
+        <PackageName Value="GridPrinterPkg"/>
+      </Item1>
+      <Item2>
+        <PackageName Value="LCL"/>
+      </Item2>
+    </RequiredPackages>
+    <Units Count="2">
+      <Unit0>
+        <Filename Value="formatted_stringgrid_demo.lpr"/>
+        <IsPartOfProject Value="True"/>
+        <UnitName Value="Formatted_StringGrid_Demo"/>
+      </Unit0>
+      <Unit1>
+        <Filename Value="main.pas"/>
+        <IsPartOfProject Value="True"/>
+        <ComponentName Value="MainForm"/>
+        <HasResources Value="True"/>
+        <ResourceBaseClass Value="Form"/>
+      </Unit1>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <PathDelim Value="\"/>
+    <Target>
+      <Filename Value="formatted_stringgrid_demo"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <UnitOutputDirectory Value="lib\$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <Linking>
+      <Debugging>
+        <DebugInfoType Value="dsDwarf3"/>
+      </Debugging>
+      <Options>
+        <Win32>
+          <GraphicApplication Value="True"/>
+        </Win32>
+      </Options>
+    </Linking>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions Count="3">
+      <Item1>
+        <Name Value="EAbort"/>
+      </Item1>
+      <Item2>
+        <Name Value="ECodetoolError"/>
+      </Item2>
+      <Item3>
+        <Name Value="EFOpenError"/>
+      </Item3>
+    </Exceptions>
+  </Debugging>
+</CONFIG>

components/gridprinter/examples/stringgrid_formatted/formatted_stringgrid_demo.lpr

@@ -0,0 +1,25 @@
+program Formatted_StringGrid_Demo;
+
+{$mode objfpc}{$H+}
+
+uses
+  {$IFDEF UNIX}
+  cthreads,
+  {$ENDIF}
+  {$IFDEF HASAMIGA}
+  athreads,
+  {$ENDIF}
+  Interfaces, // this includes the LCL widgetset
+  Forms, main
+  { you can add units after this };
+
+{$R *.res}
+
+begin
+  RequireDerivedFormResource:=True;
+  Application.Scaled:=True;
+  Application.Initialize;
+  Application.CreateForm(TMainForm, MainForm);
+  Application.Run;
+end.
+

components/gridprinter/examples/stringgrid_formatted/main.lfm

@@ -0,0 +1,76 @@
+object MainForm: TMainForm
+  Left = 356
+  Height = 441
+  Top = 194
+  Width = 779
+  Caption = 'MainForm'
+  ClientHeight = 441
+  ClientWidth = 779
+  OnCreate = FormCreate
+  LCLVersion = '2.3.0.0'
+  object ButtonPanel: TPanel
+    Left = 0
+    Height = 37
+    Top = 404
+    Width = 779
+    Align = alBottom
+    AutoSize = True
+    BevelOuter = bvNone
+    ClientHeight = 37
+    ClientWidth = 779
+    TabOrder = 0
+    object btnPrint: TButton
+      AnchorSideLeft.Control = ButtonPanel
+      AnchorSideTop.Control = ButtonPanel
+      Left = 6
+      Height = 25
+      Top = 6
+      Width = 60
+      AutoSize = True
+      BorderSpacing.Around = 6
+      Caption = 'Print...'
+      OnClick = btnPrintClick
+      TabOrder = 0
+    end
+    object btnPreview: TButton
+      AnchorSideLeft.Control = btnPrint
+      AnchorSideLeft.Side = asrBottom
+      AnchorSideTop.Control = ButtonPanel
+      Left = 78
+      Height = 25
+      Top = 6
+      Width = 76
+      AutoSize = True
+      BorderSpacing.Left = 6
+      BorderSpacing.Around = 6
+      Caption = 'Preview...'
+      OnClick = btnPreviewClick
+      TabOrder = 1
+    end
+  end
+  object StringGrid1: TStringGrid
+    Left = 6
+    Height = 398
+    Top = 6
+    Width = 767
+    Align = alClient
+    BorderSpacing.Left = 6
+    BorderSpacing.Top = 6
+    BorderSpacing.Right = 6
+    Options = [goFixedVertLine, goFixedHorzLine, goVertLine, goHorzLine, goRangeSelect, goDrawFocusSelected, goRowSizing, goColSizing, goThumbTracking, goSmoothScroll]
+    TabOrder = 1
+  end
+  object GridPrinter1: TGridPrinter
+    Grid = StringGrid1
+    Footer.Font.Height = -11
+    Header.Font.Height = -11
+    ShowPrintDialog = gpdPrintDialog
+    Left = 218
+    Top = 147
+  end
+  object GridPrintPreviewDialog1: TGridPrintPreviewDialog
+    GridPrinter = GridPrinter1
+    Left = 400
+    Top = 147
+  end
+end

components/gridprinter/examples/stringgrid_formatted/main.pas

@@ -0,0 +1,126 @@
+unit main;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ExtCtrls, Grids,
+  StdCtrls, GridPrn, GridPrnPreviewDlg;
+
+type
+
+  { TMainForm }
+
+  TMainForm = class(TForm)
+    btnPrint: TButton;
+    btnPreview: TButton;
+    ButtonPanel: TPanel;
+    GridPrinter1: TGridPrinter;
+    GridPrintPreviewDialog1: TGridPrintPreviewDialog;
+    StringGrid1: TStringGrid;
+    procedure btnPreviewClick(Sender: TObject);
+    procedure btnPrintClick(Sender: TObject);
+    procedure FormCreate(Sender: TObject);
+    procedure PrepareCanvasHandler(Sender: TObject; aCol, aRow: Integer;
+      aState: TGridDrawState);
+  private
+
+  public
+
+  end;
+
+var
+  MainForm: TMainForm;
+
+implementation
+
+{$R *.lfm}
+
+{ TMainForm }
+
+procedure TMainForm.btnPrintClick(Sender: TObject);
+begin
+  GridPrinter1.Print;
+end;
+
+procedure TMainForm.btnPreviewClick(Sender: TObject);
+begin
+  GridPrintPreviewDialog1.Execute;
+end;
+
+procedure TMainForm.FormCreate(Sender: TObject);
+const
+  NUM_ROWS = 100;
+  NUM_COLS = 20;
+var
+  r, c: Integer;
+begin
+  StringGrid1.BeginUpdate;
+  try
+    StringGrid1.Clear;
+    StringGrid1.RowCount := NUM_ROWS + StringGrid1.FixedRows;
+    StringGrid1.ColCount := NUM_COLS + StringGrid1.FixedCols;
+    for r := StringGrid1.FixedRows to StringGrid1.RowCount-1 do
+      StringGrid1.Cells[0, r] := 'Row ' + IntToStr(r);
+    for c := StringGrid1.FixedCols to StringGrid1.ColCount-1 do
+    begin
+      StringGrid1.Cells[c, 0] := 'Column ' + IntToStr(c);
+      for r := StringGrid1.FixedRows to StringGrid1.RowCount-1 do
+        StringGrid1.Cells[c, r] := Format('C%d R%d', [c, r]);
+    end;
+    StringGrid1.Cells[6, 5] := 'This is a long text';
+
+    StringGrid1.DefaultColWidth := 80;
+    StringGrid1.ColWidths[3] := 40;
+    StringGrid1.RowHeights[5] := 60;
+    StringGrid1.Options := StringGrid1.Options + [goCellEllipsis];
+    StringGrid1.AlternateColor := clMoneyGreen;
+    StringGrid1.OnPrepareCanvas := @PrepareCanvasHandler;
+    GridPrinter1.OnPrepareCanvas := @PrepareCanvasHandler;
+  finally
+    StringGrid1.EndUpdate;
+  end;
+end;
+
+procedure TMainForm.PrepareCanvasHandler(Sender: TObject; aCol,
+  aRow: Integer; aState: TGridDrawState);
+var
+  lCanvas: TCanvas;
+  ts: TTextStyle;
+begin
+  if Sender = StringGrid1 then
+    lCanvas := StringGrid1.Canvas
+  else
+  if Sender = GridPrinter1 then
+    lCanvas := GridPrinter1.Canvas
+  else
+    raise Exception.Create('Unknown sender of OnPrepareCanvas.');
+
+  ts := lCanvas.TextStyle;
+
+  if (ACol = 3) and (ARow >= StringGrid1.FixedRows) and odd(ARow) then
+  begin
+    lCanvas.Brush.Color := clSkyBlue;
+    lCanvas.Font.Color := clBlue;
+  end;
+
+  if (ACol = 6) and (ARow = 5) then
+  begin
+    ts.Wordbreak := true;
+    ts.SingleLine := false;
+    lCanvas.Font.Size := 12;
+    lCanvas.Font.Style := [fsBold];
+  end;
+
+  if (ARow = 5) then
+  begin
+    ts.Alignment := taRightJustify;
+  end;
+
+  lCanvas.TextStyle := ts;
+end;
+
+
+end.
+

components/gridprinter/source/gridprn.pas

@@ -863,7 +863,7 @@ begin
   begin
     color := ColorToRGB(lGrid.Color);
     alternateColor := ColorToRGB(lGrid.AlternateColor);
-    if (color <> alternateColor) and Odd(ARow) then
+    if (color <> alternateColor) and not Odd(ARow) then
       ACanvas.Brush.Color := alternateColor
     else
       ACanvas.Brush.Color := color;