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SWT (JFace) Image browser implementation Code _java programming

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Author: User
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The code is as follows:


Imageviewer.java


Copy Code code as follows:



Package swt_jface.demo11;


Import Org.eclipse.swt.SWT;


Import org.eclipse.swt.events.PaintEvent;


Import Org.eclipse.swt.events.PaintListener;


Import Org.eclipse.swt.graphics.GC;


Import Org.eclipse.swt.graphics.Image;


Import Org.eclipse.swt.graphics.Point;


Import Org.eclipse.swt.layout.GridData;


Import Org.eclipse.swt.layout.GridLayout;


Import Org.eclipse.swt.printing.PrintDialog;


Import Org.eclipse.swt.printing.Printer;


Import Org.eclipse.swt.printing.PrinterData;


Import Org.eclipse.swt.widgets.Canvas;


Import Org.eclipse.swt.widgets.Display;


Import org.eclipse.swt.widgets.Event;


Import Org.eclipse.swt.widgets.FileDialog;


Import Org.eclipse.swt.widgets.Listener;


Import Org.eclipse.swt.widgets.Shell;


Import Org.eclipse.swt.widgets.ToolBar;


Import Org.eclipse.swt.widgets.ToolItem;


public class Imageviewer {





Display display = new display ();


Shell shell = new shell (display);


Canvas Canvas;


Image Image;


String FileName;





Public Imageviewer () {





Shell.settext ("Image viewer");


Shell.setlayout (New GridLayout (1, true));


ToolBar ToolBar = new ToolBar (Shell, SWT. FLAT);


Toolitem Itemopen = new Toolitem (ToolBar, SWT. PUSH);


Itemopen.settext ("Open");


Itemopen.addlistener (SWT. Selection, New Listener () {


public void Handleevent (event event) {


FileDialog dialog = new FileDialog (Shell, SWT. OPEN);


String file = Dialog.open ();


if (file!= null) {


if (image!= null)


Image.dispose ();


image = NULL;


try {


Image = New Image (display, file);


catch (RuntimeException e) {


}


if (image!= null) {


FileName = file;


} else {


System.err.println (


"Failed to load image from File:" + file);


}


Canvas.redraw ();


}


}


});


Toolitem Itemprintpreview = new Toolitem (ToolBar, SWT. PUSH);


Itemprintpreview.settext ("Preview");


Itemprintpreview.addlistener (SWT. Selection, New Listener () {


public void Handleevent (event event) {


Imageprintpreviewdialog dialog =


New Imageprintpreviewdialog (Imageviewer.this);


Dialog.open ();


}


});


Toolitem itemprint = new Toolitem (ToolBar, SWT. PUSH);


Itemprint.settext ("Print");


Itemprint.addlistener (SWT. Selection, New Listener () {


public void Handleevent (event event) {


Print ();


}


});


Canvas = new Canvas (Shell, SWT. BORDER);


Canvas.setbackground (SWT, Display.getsystemcolor. Color_white));


Canvas.setlayoutdata (New Griddata (Griddata.fill_both));


Canvas.addpaintlistener (New Paintlistener () {


public void Paintcontrol (PaintEvent e) {


if (image = = null) {


E.gc.drawstring ("No image", 0, 0);


} else {


E.gc.drawimage (image, 0, 0);


}


}


});


Image = New Image (Display, "c:/icons/scene.jpg");


FileName = "Scene.jpg";


Shell.setsize (500, 400);


Shell.open ();


while (!shell.isdisposed ()) {


if (!display.readanddispatch ()) {


Display.sleep ();


}


}


Display.dispose ();


}


void print () {


PrintDialog dialog = new PrintDialog (shell);


Printerdata printerdata = Dialog.open ();


if (Printerdata = null) return;


Printer Printer = new Printer (printerdata);


print (printer, null);


}


void print (Final Printer Printer, Printmargin printmargin) {


if (image = = null) return;


Final point printerdpi = printer.getdpi ();


Final point displaydpi = display.getdpi ();


System.out.println (displaydpi + "" + printerdpi);


Final Printmargin margin = (Printmargin = null? Printmargin.getprintmargin (printer, 1.0): Printmargin);


Thread printthread = new Thread () {


public void Run () {


if (!printer.startjob (FileName)) {


System.err.println ("Failed to start print job!");


Printer.dispose ();


Return


}


GC GC = new GC (printer);


if (!printer.startpage ()) {


System.err.println ("Failed to start a new page!");


Gc.dispose ();


Return


} else {


int imagewidth = Image.getbounds (). width;


int imageheight = Image.getbounds (). Height;


Double Dpiscalefactorx = printerdpi.x * 1.0/displaydpi.x;


Double dpiscalefactory = PRINTERDPI.Y * 1.0/DISPLAYDPI.Y;


Double Imagesizefactor =


Math.min (


1,


(Margin.right-margin.left)


* 1.0


/(Dpiscalefactorx * imagewidth));


Imagesizefactor =


Math.min (


Imagesizefactor,


(Margin.bottom-margin.top)


* 1.0


/(Dpiscalefactory * imageheight));


Gc.drawimage (


Image


0,


0,


ImageWidth,


ImageHeight,


Margin.left,


Margin.top,


(int) (Dpiscalefactorx * imagesizefactor * imagewidth),


(int) (dpiscalefactory


* Imagesizefactor


* imageheight));


Gc.dispose ();


}


Printer.endpage ();


Printer.endjob ();


Printer.dispose ();


System.out.println ("Printing job done!");


}


};


Printthread.start ();


}


public static void Main (string[] args) {


New Imageviewer ();


}


}





Imageprintpreviewdialog.java


Copy Code code as follows:



Package swt_jface.demo11;


Import Org.eclipse.swt.SWT;


Import org.eclipse.swt.events.PaintEvent;


Import Org.eclipse.swt.events.PaintListener;


Import Org.eclipse.swt.graphics.Point;


Import Org.eclipse.swt.graphics.Rectangle;


Import Org.eclipse.swt.layout.GridData;


Import Org.eclipse.swt.layout.GridLayout;


Import Org.eclipse.swt.printing.PrintDialog;


Import Org.eclipse.swt.printing.Printer;


Import Org.eclipse.swt.printing.PrinterData;


Import Org.eclipse.swt.widgets.Button;


Import Org.eclipse.swt.widgets.Canvas;


Import Org.eclipse.swt.widgets.Combo;


Import Org.eclipse.swt.widgets.Dialog;


Import org.eclipse.swt.widgets.Event;


Import Org.eclipse.swt.widgets.Label;


Import Org.eclipse.swt.widgets.Listener;


Import Org.eclipse.swt.widgets.Shell;


public class Imageprintpreviewdialog extends Dialog {





Imageviewer Viewer;


Shell Shell;


Canvas Canvas;


Printer Printer;


Printmargin margin;


Combo Combo;


Public Imageprintpreviewdialog (Imageviewer Viewer) {


Super (Viewer.shell);


This.viewer = viewer;


}


public void Open () {


Shell =


New Shell (


Viewer.shell,


Swt. Dialog_trim | Swt. Application_modal | Swt. RESIZE);


Shell.settext ("Print preview");


Shell.setlayout (New GridLayout (4, false));


Final button Buttonselectprinter = New button (Shell, SWT. PUSH);


Buttonselectprinter.settext ("Select a Printer");


Buttonselectprinter.addlistener (SWT. Selection, New Listener () {


public void Handleevent (event event) {


PrintDialog dialog = new PrintDialog (shell);


Printerdata printerdata = Dialog.open ();


if (Printerdata = null) return;


Final Printer Printer = new Printer (printerdata);


SetPrinter (


Printer


Double.parsedouble (


Combo.getitem (Combo.getselectionindex ()));


}


});


New Label (Shell, SWT. NULL). SetText ("Margin in Inches:");


Combo = new Combo (shell, SWT. READ_ONLY);


Combo.add ("0.5");


Combo.add ("1.0");


Combo.add ("1.5");


Combo.add ("2.0");


Combo.add ("2.5");


Combo.add ("3.0");


Combo.select (1);


Combo.addlistener (SWT. Selection, New Listener () {


public void Handleevent (event event) {


Double value =


Double.parsedouble (


Combo.getitem (Combo.getselectionindex ()));


SetPrinter (printer, value);


}


});


Final button Buttonprint = New button (Shell, SWT. PUSH);


Buttonprint.settext ("Print");


Buttonprint.addlistener (SWT. Selection, New Listener () {


public void Handleevent (event event) {


if (printer = null)


Viewer.print ();


Else


Viewer.print (printer, margin);


Shell.dispose ();


}


});


Canvas = new Canvas (Shell, SWT. BORDER);


Griddata griddata = new Griddata (Griddata.fill_both);


Griddata.horizontalspan = 4;


Canvas.setlayoutdata (Griddata);


Canvas.addpaintlistener (New Paintlistener () {


public void Paintcontrol (PaintEvent e) {


int canvasborder = 20;


if (printer = null | | printer.isdisposed ()) return;


Rectangle Rectangle = Printer.getbounds ();


Point canvassize = Canvas.getsize ();


Double Viewscalefactor =


(Canvassize.x-canvasborder * 2) * 1.0/RECTANGLE.WIDTH;


Viewscalefactor =


Math.min (


Viewscalefactor,


(Canvassize.y-canvasborder * 2)


* 1.0


/rectangle.height);


int OffsetX =


(canvassize.x-(int) (Viewscalefactor * rectangle.width))


/2;


int OffsetY =


(Canvassize.y-(int) (Viewscalefactor * rectangle.height))


/2;


E.gc.setbackground (


Shell.getdisplay (). Getsystemcolor (SWT. Color_white));


E.gc.fillrectangle (


OffsetX,


OffsetY,


(int) (Viewscalefactor * rectangle.width),


(int) (Viewscalefactor * rectangle.height));


E.gc.setlinestyle (SWT. Line_dash);


E.gc.setforeground (Shell.getdisplay (). Getsystemcolor (SWT. Color_black));


int marginoffsetx = OffsetX + (int) (Viewscalefactor * margin.left);


int marginoffsety = OffsetY + (int) (Viewscalefactor * margin.top);


E.gc.drawrectangle (


Marginoffsetx,


Marginoffsety,


(int) (Viewscalefactor * (Margin.right-margin.left)),


(int) (Viewscalefactor * (margin.bottom-margin.top));


if (viewer.image!= null) {


int imagewidth = Viewer.image.getBounds (). width;


int imageheight = Viewer.image.getBounds (). Height;


Double Dpiscalefactorx =


PRINTER.GETDPI (). x


* 1.0


/Shell.getdisplay (). getdpi (). x;


Double dpiscalefactory =


PRINTER.GETDPI (). Y


* 1.0


/Shell.getdisplay (). getdpi (). Y;


Double Imagesizefactor =


Math.min (


1,


(Margin.right-margin.left)


* 1.0


/(Dpiscalefactorx * imagewidth));


Imagesizefactor =


Math.min (


Imagesizefactor,


(Margin.bottom-margin.top)


* 1.0


/(Dpiscalefactory * imageheight));


E.gc.drawimage (


Viewer.image,


0,


0,


ImageWidth,


ImageHeight,


Marginoffsetx,


Marginoffsety,


(int) (Dpiscalefactorx


* Imagesizefactor


* ImageWidth


* Viewscalefactor),


(int) (dpiscalefactory


* Imagesizefactor


* ImageHeight


* viewscalefactor));


}


}


});


Shell.setsize (400, 400);


Shell.open ();


SetPrinter (null, 1.0);


while (!shell.isdisposed ()) {


if (!shell.getdisplay (). Readanddispatch ()) {


Shell.getdisplay (). Sleep ();


}


}


}


void SetPrinter (Printer Printer, double marginsize) {


if (printer = = null) {


Printer = new Printer (Printer.getdefaultprinterdata ());


}


This.printer = printer;


Margin = Printmargin.getprintmargin (printer, marginsize);


Canvas.redraw ();


}


}


Package swt_jface.demo11;


Import Org.eclipse.swt.SWT;


Import org.eclipse.swt.events.PaintEvent;


Import Org.eclipse.swt.events.PaintListener;


Import Org.eclipse.swt.graphics.Point;


Import Org.eclipse.swt.graphics.Rectangle;


Import Org.eclipse.swt.layout.GridData;


Import Org.eclipse.swt.layout.GridLayout;


Import Org.eclipse.swt.printing.PrintDialog;


Import Org.eclipse.swt.printing.Printer;


Import Org.eclipse.swt.printing.PrinterData;


Import Org.eclipse.swt.widgets.Button;


Import Org.eclipse.swt.widgets.Canvas;


Import Org.eclipse.swt.widgets.Combo;


Import Org.eclipse.swt.widgets.Dialog;


Import org.eclipse.swt.widgets.Event;


Import Org.eclipse.swt.widgets.Label;


Import Org.eclipse.swt.widgets.Listener;


Import Org.eclipse.swt.widgets.Shell;


public class Imageprintpreviewdialog extends Dialog {





Imageviewer Viewer;


Shell Shell;


Canvas Canvas;


Printer Printer;


Printmargin margin;


Combo Combo;


Public Imageprintpreviewdialog (Imageviewer Viewer) {


Super (Viewer.shell);


This.viewer = viewer;


}


public void Open () {


Shell =


New Shell (


Viewer.shell,


Swt. Dialog_trim | Swt. Application_modal | Swt. RESIZE);


Shell.settext ("Print preview");


Shell.setlayout (New GridLayout (4, false));


Final button Buttonselectprinter = New button (Shell, SWT. PUSH);


Buttonselectprinter.settext ("Select a Printer");


Buttonselectprinter.addlistener (SWT. Selection, New Listener () {


public void Handleevent (event event) {


PrintDialog dialog = new PrintDialog (shell);


Printerdata printerdata = Dialog.open ();


if (Printerdata = null) return;


Final Printer Printer = new Printer (printerdata);


SetPrinter (


Printer


Double.parsedouble (


Combo.getitem (Combo.getselectionindex ()));


}


});


New Label (Shell, SWT. NULL). SetText ("Margin in Inches:");


Combo = new Combo (shell, SWT. READ_ONLY);


Combo.add ("0.5");


Combo.add ("1.0");


Combo.add ("1.5");


Combo.add ("2.0");


Combo.add ("2.5");


Combo.add ("3.0");


Combo.select (1);


Combo.addlistener (SWT. Selection, New Listener () {


public void Handleevent (event event) {


Double value =


Double.parsedouble (


Combo.getitem (Combo.getselectionindex ()));


SetPrinter (printer, value);


}


});


Final button Buttonprint = New button (Shell, SWT. PUSH);


Buttonprint.settext ("Print");


Buttonprint.addlistener (SWT. Selection, New Listener () {


public void Handleevent (event event) {


if (printer = null)


Viewer.print ();


Else


Viewer.print (printer, margin);


Shell.dispose ();


}


});


Canvas = new Canvas (Shell, SWT. BORDER);


Griddata griddata = new Griddata (Griddata.fill_both);


Griddata.horizontalspan = 4;


Canvas.setlayoutdata (Griddata);


Canvas.addpaintlistener (New Paintlistener () {


public void Paintcontrol (PaintEvent e) {


int canvasborder = 20;


if (printer = null | | printer.isdisposed ()) return;


Rectangle Rectangle = Printer.getbounds ();


Point canvassize = Canvas.getsize ();


Double Viewscalefactor =


(Canvassize.x-canvasborder * 2) * 1.0/RECTANGLE.WIDTH;


Viewscalefactor =


Math.min (


Viewscalefactor,


(Canvassize.y-canvasborder * 2)


* 1.0


/rectangle.height);


int OffsetX =


(canvassize.x-(int) (Viewscalefactor * rectangle.width))


/2;


int OffsetY =


(Canvassize.y-(int) (Viewscalefactor * rectangle.height))


/2;


E.gc.setbackground (


Shell.getdisplay (). Getsystemcolor (SWT. Color_white));


E.gc.fillrectangle (


OffsetX,


OffsetY,


(int) (Viewscalefactor * rectangle.width),


(int) (Viewscalefactor * rectangle.height));


E.gc.setlinestyle (SWT. Line_dash);


E.gc.setforeground (Shell.getdisplay (). Getsystemcolor (SWT. Color_black));


int marginoffsetx = OffsetX + (int) (Viewscalefactor * margin.left);


int marginoffsety = OffsetY + (int) (Viewscalefactor * margin.top);


E.gc.drawrectangle (


Marginoffsetx,


Marginoffsety,


(int) (Viewscalefactor * (Margin.right-margin.left)),


(int) (Viewscalefactor * (margin.bottom-margin.top));


if (viewer.image!= null) {


int imagewidth = Viewer.image.getBounds (). width;


int imageheight = Viewer.image.getBounds (). Height;


Double Dpiscalefactorx =


PRINTER.GETDPI (). x


* 1.0


/Shell.getdisplay (). getdpi (). x;


Double dpiscalefactory =


PRINTER.GETDPI (). Y


* 1.0


/Shell.getdisplay (). getdpi (). Y;


Double Imagesizefactor =


Math.min (


1,


(Margin.right-margin.left)


* 1.0


/(Dpiscalefactorx * imagewidth));


Imagesizefactor =


Math.min (


Imagesizefactor,


(Margin.bottom-margin.top)


* 1.0


/(Dpiscalefactory * imageheight));


E.gc.drawimage (


Viewer.image,


0,


0,


ImageWidth,


ImageHeight,


Marginoffsetx,


Marginoffsety,


(int) (Dpiscalefactorx


* Imagesizefactor


* ImageWidth


* Viewscalefactor),


(int) (dpiscalefactory


* Imagesizefactor


* ImageHeight


* viewscalefactor));


}


}


});


Shell.setsize (400, 400);


Shell.open ();


SetPrinter (null, 1.0);


while (!shell.isdisposed ()) {


if (!shell.getdisplay (). Readanddispatch ()) {


Shell.getdisplay (). Sleep ();


}


}


}


void SetPrinter (Printer Printer, double marginsize) {


if (printer = = null) {


Printer = new Printer (Printer.getdefaultprinterdata ());


}


This.printer = printer;


Margin = Printmargin.getprintmargin (printer, marginsize);


Canvas.redraw ();


}


}








Printmargin.java





Copy Code code as follows:



Package swt_jface.demo11;


Import Org.eclipse.swt.graphics.Point;


Import Org.eclipse.swt.graphics.Rectangle;


Import Org.eclipse.swt.printing.Printer;


public class Printmargin {





public int left;


public int right;


public int top;


public int bottom;


Private Printmargin (int left, right of int, int top, int bottom) {


This.left = left;


This.right = right;


This.top = top;


This.bottom = bottom;


}


Static Printmargin Getprintmargin (Printer Printer, double margin) {


return Getprintmargin (printer, margin, margin, margin, margin);


}


Static Printmargin Getprintmargin (


Printer Printer,


Double MarginLeft,


Double MarginRight,


Double MarginTop,


Double marginbottom) {


Rectangle Clientarea = Printer.getclientarea ();


Rectangle trim = Printer.computetrim (0, 0, 0, 0);


Point dpi = printer.getdpi ();


int leftMargin = (int) (MARGINLEFT * dpi.x)-trim.x;


int rightMargin =


Clientarea.width


+ Trim.width


-(int) (MarginRight * dpi.x)


-Trim.x;


int topMargin = (int) (MARGINTOP * dpi.y)-trim.y;


int bottommargin =


Clientarea.height


+ Trim.height


-(int) (MarginBottom * dpi.y)


-Trim.y;


return new Printmargin (


LeftMargin,


RightMargin,


TopMargin,


BottomMargin);


}


Public String toString () {


Return "Margin {"


+ Left


+ ", "


+ Right


+ "; "


+ Top


+ ", "


+ Bottom


+ " }";


}


}





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