Changeset 455 for PrintPreview/UPrintPreview.pas

Timestamp:

Nov 28, 2012, 7:44:19 AM (11 years ago)

Author:

chronos

Message:

• Modified: PrintPreview should use TVectorCanvas instead of raster TCanvas dependent on DPI of printer. But some font function as TextWidth and TextHeight cannot be easily implemented without use of OS API.

File:

• PrintPreview/UPrintPreview.pas (modified) (17 diffs)

PrintPreview/UPrintPreview.pas

@@ -7 +7 @@
 uses
   Classes, SysUtils, FileUtil, LResources, Forms, Controls, Graphics, Dialogs,
-  ComCtrls, ExtCtrls, ActnList, PrintersDlgs, Contnrs, Printers, StdCtrls;
+  ComCtrls, ExtCtrls, ActnList, PrintersDlgs, Contnrs, Printers, StdCtrls,
+  Menus, LCLType, types;
 
 const
@@ -30 +31 @@
     FOnNewPage: TNotifyEvent;
     FOnPrint: TNotifyEvent;
-    FOnPrintFooter: TNotifyEvent;
+    //FOnPrintFooter: TNotifyEvent;
     FZoom: Double;
     FPageNumber: Integer;
@@ -73 +74 @@
   TPrintPreviewForm = class(TForm)
     AClose: TAction;
+    AToolbarShowCaption: TAction;
+    AZoomFitToWidth: TAction;
+    AZoomFitToHeight: TAction;
     ALastPage: TAction;
     AFirstPage: TAction;
@@ -83 +87 @@
     APrint: TAction;
     ActionList1: TActionList;
-    Button1: TButton;
-    Button2: TButton;
-    Button3: TButton;
-    Button4: TButton;
+    ComboBoxZoom: TComboBox;
     EditPageNumber: TEdit;
     Image1: TImage;
     ImageList1: TImageList;
+    MenuItem1: TMenuItem;
     PageSetupDialog1: TPageSetupDialog;
+    Panel1: TPanel;
+    PopupMenuToolbar: TPopupMenu;
     PrintDialog1: TPrintDialog;
     PrinterSetupDialog1: TPrinterSetupDialog;
@@ -97 +101 @@
     ToolBar1: TToolBar;
     ToolButton1: TToolButton;
+    ToolButton10: TToolButton;
+    ToolButton11: TToolButton;
+    ToolButton12: TToolButton;
+    ToolButton13: TToolButton;
+    ToolButton14: TToolButton;
+    ToolButton15: TToolButton;
     ToolButton2: TToolButton;
     ToolButton3: TToolButton;
@@ -113 +123 @@
     procedure APrinterSetupExecute(Sender: TObject);
     procedure APrintExecute(Sender: TObject);
+    procedure AToolbarShowCaptionExecute(Sender: TObject);
+    procedure AZoomFitToHeightExecute(Sender: TObject);
+    procedure AZoomFitToWidthExecute(Sender: TObject);
     procedure AZoomInExecute(Sender: TObject);
     procedure AZoomOutExecute(Sender: TObject);
+    procedure ComboBoxZoomChange(Sender: TObject);
     procedure EditPageNumberChange(Sender: TObject);
     procedure FormCreate(Sender: TObject);
@@ -120 +134 @@
     procedure FormResize(Sender: TObject);
     procedure FormShow(Sender: TObject);
+    procedure Image1MouseDown(Sender: TObject; Button: TMouseButton;
+      Shift: TShiftState; X, Y: Integer);
+    procedure Image1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer
+      );
+    procedure Image1MouseUp(Sender: TObject; Button: TMouseButton;
+      Shift: TShiftState; X, Y: Integer);
+    procedure Image1MouseWheel(Sender: TObject; Shift: TShiftState;
+      WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
     procedure ScrollBarHorizChange(Sender: TObject);
     procedure ScrollBarVertChange(Sender: TObject);
   private
+    DragStart: Boolean;
+    DragStartPos: TPoint;
+    DragScrollBarPos: TPoint;
     FPrintPreview: TPrintPreview;
-    procedure ReloadPageNumber;
+    procedure UpdateInterface;
   public
     PageNumber: Integer;
+    MinZoom: Double;
+    MaxZoom: Double;
+    procedure EraseBackground(DC: HDC); override;
     procedure Redraw;
     property PrintPreview: TPrintPreview read FPrintPreview
@@ -285 +313 @@
 
 procedure TPrintPreview.Preview;
-const
-  DefaultMargin = 10;
 begin
   if Assigned(FOnPrint) then begin
@@ -349 +375 @@
   PrintDialog1.FromPage := 1;
   PrintDialog1.ToPage := PrintPreview.PageCount;
-  if PrintDialog1.Execute then
+  if PrintDialog1.Execute then begin
     if Assigned(FPrintPreview) then PrintPreview.Print;
+  end;
+end;
+
+procedure TPrintPreviewForm.AToolbarShowCaptionExecute(Sender: TObject);
+begin
+  AToolbarShowCaption.Checked := not AToolbarShowCaption.Checked;
+  if AToolbarShowCaption.Checked then begin
+    ToolBar1.ButtonHeight := 42;
+    ToolBar1.ButtonWidth := 42;
+    ToolBar1.ShowCaptions := True;
+  end else begin
+    ToolBar1.ButtonHeight := 22;
+    ToolBar1.ButtonWidth := 23;
+    ToolBar1.ShowCaptions := False;
+  end;
+end;
+
+procedure TPrintPreviewForm.AZoomFitToHeightExecute(Sender: TObject);
+begin
+  PrintPreview.Zoom := 1 / (Printer.PageHeight / SizeDivider / Image1.Height) * 0.95;
+  ScrollBarVert.Position := 0;
+  Redraw;
+  UpdateInterface;
+end;
+
+procedure TPrintPreviewForm.AZoomFitToWidthExecute(Sender: TObject);
+begin
+  PrintPreview.Zoom := 1 / (Printer.PageWidth / SizeDivider / Image1.Width) * 0.95;
+  ScrollBarHoriz.Position := 0;
+  Redraw;
+  UpdateInterface;
 end;
 
 procedure TPrintPreviewForm.AZoomInExecute(Sender: TObject);
-begin
-  PrintPreview.Zoom := PrintPreview.Zoom * 1.25;
-  Redraw;
+var
+  NewZoom: Double;
+begin
+  NewZoom := PrintPreview.Zoom * 1.25;
+  if NewZoom > MaxZoom then NewZoom := MaxZoom;
+  PrintPreview.Zoom := NewZoom;
+  Redraw;
+  UpdateInterface;
 end;
 
 procedure TPrintPreviewForm.AZoomOutExecute(Sender: TObject);
-begin
-  PrintPreview.Zoom := PrintPreview.Zoom / 1.25;
-  EditPageNumberChange(Self);
-  Redraw;
+var
+  NewZoom: Double;
+begin
+  NewZoom := PrintPreview.Zoom / 1.25;
+  if NewZoom < MinZoom then NewZoom := MinZoom;
+  PrintPreview.Zoom := NewZoom;
+  Redraw;
+  UpdateInterface;
+end;
+
+procedure TPrintPreviewForm.ComboBoxZoomChange(Sender: TObject);
+var
+  ZoomText: string;
+  NewZoomInt: Integer;
+  NewZoom: Double;
+begin
+  ZoomText := Trim(ComboBoxZoom.Text);
+  if Pos('%', ZoomText) > 0 then
+    ZoomText := Copy(ZoomText, 1, Pos('%', ZoomText) - 1);
+  if TryStrToInt(ZoomText, NewZoomInt) then begin
+    NewZoom := NewZoomInt / 100;
+    if NewZoom < MinZoom then NewZoom := MinZoom;
+    if NewZoom > MaxZoom then NewZoom := MaxZoom;
+    PrintPreview.Zoom := NewZoom;
+    EditPageNumberChange(Self);
+    Redraw;
+  end;
 end;
 
@@ -376 +461 @@
       PageNumber := PrintPreview.PageCount - 1;
   end;
-  ReloadPageNumber;
+  UpdateInterface;
 end;
 
 procedure TPrintPreviewForm.FormCreate(Sender: TObject);
 begin
-  DoubleBuffered := True;
+  //DoubleBuffered := True;
+  Panel1.DoubleBuffered := True;
+  AToolbarShowCaption.Checked := True;
+  MinZoom := 0.1;
+  MaxZoom := 3;
 end;
 
@@ -418 +507 @@
 
   PrintDialog1.MaxPage := PrintPreview.Pages.Count;
-  ReloadPageNumber;
-  Redraw;
+  UpdateInterface;
+  Redraw;
+end;
+
+procedure TPrintPreviewForm.Image1MouseDown(Sender: TObject;
+  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
+begin
+  DragStartPos := Point(X, Y);
+  DragStart := True;
+  DragScrollBarPos := Point(ScrollBarHoriz.Position, ScrollBarVert.Position);
+end;
+
+procedure TPrintPreviewForm.Image1MouseMove(Sender: TObject;
+  Shift: TShiftState; X, Y: Integer);
+begin
+  if DragStart then begin
+    ScrollBarHoriz.Position := DragScrollBarPos.X - Trunc((X - DragStartPos.x) *
+      (ScrollBarHoriz.Max - ScrollBarHoriz.Min) / Width / PrintPreview.Zoom);
+    ScrollBarVert.Position := DragScrollBarPos.Y - Trunc((Y - DragStartPos.Y) *
+      (ScrollBarVert.Max - ScrollBarVert.Min) / Height / PrintPreview.Zoom);
+  end;
+end;
+
+procedure TPrintPreviewForm.Image1MouseUp(Sender: TObject;
+  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
+begin
+  DragStart := False;
+end;
+
+procedure TPrintPreviewForm.Image1MouseWheel(Sender: TObject;
+  Shift: TShiftState; WheelDelta: Integer; MousePos: TPoint;
+  var Handled: Boolean);
+begin
+  if WheelDelta > 0 then AZoomIn.Execute
+  else if WheelDelta < 0 then AZoomOut.Execute;
 end;
 
@@ -432 +554 @@
 end;
 
-procedure TPrintPreviewForm.ReloadPageNumber;
+procedure TPrintPreviewForm.UpdateInterface;
 begin
   EditPageNumber.Text := IntToStr(PageNumber);
   Redraw;
   ANextPage.Enabled := PageNumber < (PrintPreview.PageCount - 1);
+  ALastPage.Enabled := PageNumber < (PrintPreview.PageCount - 1);
   APreviousPage.Enabled := PageNumber > 0;
+  AFirstPage.Enabled := PageNumber > 0;
+  ComboBoxZoom.Text := IntToStr(Trunc(PrintPreview.Zoom * 100)) + '%';
+end;
+
+procedure TPrintPreviewForm.EraseBackground(DC: HDC);
+begin
+  //inherited EraseBackground(DC);
 end;
 
 procedure TPrintPreviewForm.Redraw;
 var
-  SourceRect: TRect;
+  //SourceRect: TRect;
   DestRect: TRect;
   Page: TPrintPage;
+  PageSize: TPoint;
 begin
   Page := TPrintPage(PrintPreview.Pages[PageNumber]);
-  SourceRect := Rect(0, 0,
-    Page.Bitmap.Canvas.Width,
-    Page.Bitmap.Canvas.Height);
-  DestRect.Left := -Round(ScrollBarHoriz.Position / ScrollBarHoriz.Max * Width * PrintPreview.Zoom);
-  DestRect.Top := -Round(ScrollBarVert.Position / ScrollBarVert.Max * Height * PrintPreview.Zoom);
-  DestRect.Right := DestRect.Left + Round(Page.Bitmap.Canvas.Width * PrintPreview.Zoom);
-  DestRect.Bottom := DestRect.Top + Round(Page.Bitmap.Canvas.Height * PrintPreview.Zoom);
+  //SourceRect := Rect(0, 0,
+  //  Page.Bitmap.Canvas.Width,
+  //  Page.Bitmap.Canvas.Height);
+  PageSize := Point(Round(Page.Bitmap.Canvas.Width),
+    Round(Page.Bitmap.Canvas.Height));
+  DestRect.Left := (Image1.Width - PageSize.X) div 2 - Round(ScrollBarHoriz.Position /
+    (ScrollBarHoriz.Max - ScrollBarHoriz.Min) * Image1.Width * PrintPreview.Zoom);
+  DestRect.Top := (Image1.Height - PageSize.Y) div 2 - Round(ScrollBarVert.Position /
+    (ScrollBarVert.Max - ScrollBarVert.Min) * Image1.Height * PrintPreview.Zoom);
+  DestRect.Right := DestRect.Left + PageSize.X;
+  DestRect.Bottom := DestRect.Top + PageSize.Y;
   try
     Image1.Picture.Bitmap.SetSize(Image1.Width, Image1.Height);
     Image1.Picture.Bitmap.BeginUpdate(True);
     with Image1.Picture.Bitmap, Canvas do begin
-      Brush.Color := clBlack;
+      Brush.Color := clGray;
       Brush.Style := bsSolid;
-      FillRect(Rect(0, 0, Width, Height));
+      FillRect(Rect(0, 0, Image1.Picture.Bitmap.Width, Image1.Picture.Bitmap.Height));
       Draw(DestRect.Left, DestRect.Top, Page.Bitmap);
       //CopyRect(DestRect, Page.Bitmap.Canvas, SourceRect);
@@ -485 +620 @@
         Round(PageSetupDialog1.Margins.Bottom / 100));
       UpdateMargins;
+      PrintPreview.Preview;
       Redraw;
     end;
@@ -494 +630 @@
   Dec(PageNumber);
   if PageNumber < 0 then PageNumber := 0;
-  ReloadPageNumber;
+  UpdateInterface;
 end;
 
@@ -502 +638 @@
   if PageNumber >= PrintPreview.PageCount then
     PageNumber := PrintPreview.PageCount;
-  ReloadPageNumber;
+  UpdateInterface;
 end;
 
@@ -508 +644 @@
 begin
   PageNumber := PrintPreview.PageCount - 1;
-  ReloadPageNumber;
+  UpdateInterface;
 end;
 
@@ -514 +650 @@
 begin
   PageNumber := 0;
-  ReloadPageNumber;
+  UpdateInterface;
 end;