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com.port80.swt.apps
Class ImageViewer3  

java.lang.Object
  com.port80.swt.apps.ImageViewer3

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public class ImageViewer3

extends java.lang.Object

An image viewer using swt.

A GC can be created on an Image and then use it to draw into the Image.

To display very large image, pixel data is loaded into ImageData and then tiles of the data are used to create Image's for display.

This is an more acceptable version of ImageViewer2. Instead of allocating a new Image on scroll, the buffered Image is scrolled and damaged area is updated. A new Image is allocated only when the size of the Canvas client area changed.

Small scrolling is quite smooth for really small scroll but noticably worse when scroll step get larger. There are flicker in the damaged region as it is cleared before updated.

Large scrolls (512 pixels) left the damaged region as cleared for fraction of a second before being updated.

Expose redraw is instantaneous.

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Nested Class Summary
(package private)  class	ImageViewer3.TextPrompter

 

Field Summary
private  org.eclipse.swt.graphics.Color	fBlackColor
private  int	fClientH
private  int	fClientW
private  org.eclipse.swt.graphics.Cursor	fCrossCursor
private  org.eclipse.swt.widgets.Label	fDataLabel
private  org.eclipse.swt.custom.StyledText	fDataText
private  org.eclipse.swt.widgets.Display	fDisplay
private  java.lang.String	fFilename
private  org.eclipse.swt.graphics.Font	fFont
private  org.eclipse.swt.graphics.Image	fImage
private  org.eclipse.swt.widgets.Canvas	fImageCanvas
private  org.eclipse.swt.graphics.ImageData	fImageData
private  int	fImageDataIndex
private  org.eclipse.swt.graphics.ImageData[]	fImageDatas
private  int	fImageH
private  int	fImageW
private  int	fImageX
private  int	fImageY
private  boolean	fIncremental
private  org.eclipse.swt.widgets.Label	fInfoLabel
private  java.lang.String	fLastPath
private  org.eclipse.swt.graphics.Color	fLightColor
private  long	fLoadTime
private  org.eclipse.swt.widgets.Sash	fSash
private  double	fScale
private  org.eclipse.swt.widgets.Combo	fScaleCombo
private  org.eclipse.swt.widgets.Shell	fShell
private  boolean	fShowMask
private  org.eclipse.swt.widgets.Label	fStatusLabel
private  boolean	fTransparent
private  org.eclipse.swt.graphics.Color	fWhiteColor
private  int	fX
private  int	fY
private static java.lang.String[]	IMAGE_FILTER_NAMES
private static java.lang.String[]	IMAGE_SUFFICES
private static java.lang.String	NAME

 

Constructor Summary

ImageViewer3()

 

Method Summary
(package private)  void	createFileMenu(org.eclipse.swt.widgets.Menu menuBar)
(package private)  org.eclipse.swt.graphics.Image	createImage(int x, int y, int w, int h)           Extract an Image from the given area of the original image, fImageData.
(package private)  org.eclipse.swt.widgets.Menu	createMenuBar()
(package private) static java.lang.String	createMsg(java.lang.String msg, java.lang.Object arg)
(package private)  void	createWidgets()
(package private)  void	displayImage(org.eclipse.swt.graphics.ImageData newImageData)
(package private)  void	dispose()
(package private) static java.lang.String	fileTypeString(int filetype)
(package private)  org.eclipse.swt.widgets.Display	getDisplay()
(package private)  org.eclipse.swt.widgets.Shell	getShell()
(package private) static java.lang.String	i18n(java.lang.String str)
static void	main(java.lang.String[] args)
org.eclipse.swt.widgets.Shell	open(org.eclipse.swt.widgets.Display display)
(package private)  void	openFile()
(package private)  void	openURL()
(package private)  void	paintImage(org.eclipse.swt.events.PaintEvent event)
(package private)  void	reset()
(package private)  void	resetScaleCombo()
(package private)  void	resetScrollBars()
(package private)  void	resizeScrollBars()
(package private)  void	resizeShell(org.eclipse.swt.events.ControlEvent event)
(package private)  void	scaleImage()
(package private)  void	scrollHorizontally(org.eclipse.swt.widgets.ScrollBar scrollBar)
(package private)  void	scrollVertically(org.eclipse.swt.widgets.ScrollBar scrollBar)
(package private)  void	showColorAt(int mx, int my)
(package private)  void	showColorForData()
(package private)  void	showColorForPixel(int x, int y)
(package private)  void	showErrorDialog(java.lang.String operation, java.lang.String filename, java.lang.Exception e)

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

NAME

private static final java.lang.String NAME

See Also:

Constant Field Values

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IMAGE_SUFFICES

private static final java.lang.String[] IMAGE_SUFFICES

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IMAGE_FILTER_NAMES

private static final java.lang.String[] IMAGE_FILTER_NAMES

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fDisplay

private org.eclipse.swt.widgets.Display fDisplay

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fShell

private org.eclipse.swt.widgets.Shell fShell

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fFont

private org.eclipse.swt.graphics.Font fFont

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fWhiteColor

private org.eclipse.swt.graphics.Color fWhiteColor

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fBlackColor

private org.eclipse.swt.graphics.Color fBlackColor

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fLightColor

private org.eclipse.swt.graphics.Color fLightColor

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fCrossCursor

private org.eclipse.swt.graphics.Cursor fCrossCursor

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fImage

private org.eclipse.swt.graphics.Image fImage

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fImageDatas

private org.eclipse.swt.graphics.ImageData[] fImageDatas

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fImageData

private org.eclipse.swt.graphics.ImageData fImageData

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fImageDataIndex

private int fImageDataIndex

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fScale

private double fScale

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fX

private int fX

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fY

private int fY

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fImageX

private int fImageX

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fImageY

private int fImageY

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fImageW

private int fImageW

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fImageH

private int fImageH

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fClientW

private int fClientW

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fClientH

private int fClientH

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fLastPath

private java.lang.String fLastPath

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fTransparent

private boolean fTransparent

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fShowMask

private boolean fShowMask

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fIncremental

private boolean fIncremental

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fLoadTime

private long fLoadTime

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fFilename

private java.lang.String fFilename

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fScaleCombo

private org.eclipse.swt.widgets.Combo fScaleCombo

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fImageCanvas

private org.eclipse.swt.widgets.Canvas fImageCanvas

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fSash

private org.eclipse.swt.widgets.Sash fSash

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fDataLabel

private org.eclipse.swt.widgets.Label fDataLabel

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fStatusLabel

private org.eclipse.swt.widgets.Label fStatusLabel

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fDataText

private org.eclipse.swt.custom.StyledText fDataText

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fInfoLabel

private org.eclipse.swt.widgets.Label fInfoLabel

Constructor Detail

ImageViewer3

public ImageViewer3()

Method Detail

main

public static void main(java.lang.String[] args)

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open

public org.eclipse.swt.widgets.Shell open(org.eclipse.swt.widgets.Display display)

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dispose

void dispose()

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getShell

org.eclipse.swt.widgets.Shell getShell()

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getDisplay

org.eclipse.swt.widgets.Display getDisplay()

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createWidgets

void createWidgets()

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createMenuBar

org.eclipse.swt.widgets.Menu createMenuBar()

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createFileMenu

void createFileMenu(org.eclipse.swt.widgets.Menu menuBar)

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openFile

void openFile()

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openURL

void openURL()

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displayImage

void displayImage(org.eclipse.swt.graphics.ImageData newImageData)

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paintImage

void paintImage(org.eclipse.swt.events.PaintEvent event)

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createImage

org.eclipse.swt.graphics.Image createImage(int x,
                                           int y,
                                           int w,
                                           int h)

Extract an Image from the given area of the original image, fImageData.

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showColorAt

void showColorAt(int mx,
                 int my)

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showColorForPixel

void showColorForPixel(int x,
                       int y)

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showColorForData

void showColorForData()

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scrollHorizontally

void scrollHorizontally(org.eclipse.swt.widgets.ScrollBar scrollBar)

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scrollVertically

void scrollVertically(org.eclipse.swt.widgets.ScrollBar scrollBar)

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scaleImage

void scaleImage()

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resetScaleCombo

void resetScaleCombo()

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resetScrollBars

void resetScrollBars()

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resizeScrollBars

void resizeScrollBars()

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resizeShell

void resizeShell(org.eclipse.swt.events.ControlEvent event)

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reset

void reset()

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showErrorDialog

void showErrorDialog(java.lang.String operation,
                     java.lang.String filename,
                     java.lang.Exception e)

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fileTypeString

static java.lang.String fileTypeString(int filetype)

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createMsg

static java.lang.String createMsg(java.lang.String msg,
                                  java.lang.Object arg)

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i18n

static java.lang.String i18n(java.lang.String str)

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> port80 >> swt >> [ apps overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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