Package totalcross.ui

Class Whiteboard

java.lang.Object

totalcross.ui.gfx.GfxSurface

totalcross.ui.Control

totalcross.ui.Whiteboard

public class Whiteboard
extends Control

This is a whiteboard that can be used to draw something. It uses a special event flag in order to improve the accuracy.

Nested Class Summary

Nested classes/interfaces inherited from class totalcross.ui.Control

Control.TranslucentShape

Field Summary

Fields

Modifier and Type	Field	Description
int	borderColor	Set this to some color so a frame can be drawn around the image
boolean	thick	Set to true to draw a thick line.
boolean	useAA	Deprecated. This field is useless in OpenGL platforms

Fields inherited from class totalcross.ui.Control

AFTER, alphaValue, appId, appObj, asContainer, asWindow, backColor, BEFORE, BOTTOM, BOTTOM_OF, BRIGHTER_BACKGROUND, callListenersOnAllTargets, CENTER, CENTER_OF, clearValueInt, clearValueStr, DARKER_BACKGROUND, DP, effect, enableUpdateScreen, esce, eventsEnabled, FILL, fillColor, FIT, floating, fm, fmH, focusHandler, focusLess, focusOnPenDown, focusTraversable, font, FONTSIZE, foreColor, height, ignoreInsets, isHighlighting, isTablet, KEEP, keepDisabled, keepEnabled, LEFT, next, nextTabControl, npParts, offscreen, offscreen0, onEventFirst, parent, PARENTSIZE, PARENTSIZEMAX, PARENTSIZEMIN, PREFERRED, prev, RANGE, repositionAllowed, RIGHT, RIGHT_OF, SAME, SCREENSIZE, SCREENSIZEMAX, SCREENSIZEMIN, setFont, setH, setRel, setW, setX, SETX_NOT_SET, setY, tempW, textShadowColor, TOP, translucentShape, transparentBackground, uiAdjustmentsBasedOnFontHeightIsSupported, uiAndroid, UICONST, uiFlat, uiHolo, uiMaterial, uiVista, visible, width, WILL_RESIZE, x, y

Constructor Summary

Constructors

Constructor	Description
Whiteboard()	Constructs a new whiteboard, setting the back color to white.

Method Summary

Modifier and Type	Method	Description
void	clear()	Clears the WhiteBoard to the current background color.
Image	getImage()	Returns the image where the drawing is taking place.
int	getPenColor()	Returns the drawing pen color.
int	getPreferredHeight()	Returns the preferred height: FILL
int	getPreferredWidth()	Returns the preferred width: FILL
void	onBoundsChanged(boolean screenChanged)	Now that we know our bounds, we can create the image that will hold the drawing
void	onEvent(Event event)	Called to process key, pen, control and other posted events.
void	onPaint(Graphics g)	Called to draw the control.
void	setImage(Image image)	Sets the image for this WhiteBoard.
void	setPenColor(int c)	Sets the drawing pen color

Methods inherited from class totalcross.ui.Control

_onEvent, addEnabledStateListener, addFocusListener, addFontChangeHandler, addGridListener, addHandler, addHighlightListener, addKeyListener, addListContainerListener, addMouseListener, addMultiTouchListener, addPenListener, addPressListener, addPushNotificationListener, addSizeChangeHandler, addTimer, addTimer, addTimerListener, addValueChangeHandler, addWindowListener, bringToFront, changeHighlighted, contains, drawTranslucentBackground, getAbsoluteRect, getBackColor, getDoEffect, getEffectH, getEffectW, getEffectX, getEffectY, getEventListeners, getFont, getForeColor, getGap, getGraphics, getHeight, getNext, getParent, getParentWindow, getPos, getPressedEvent, getPrev, getRect, getSize, getTextShadowColor, getWidth, getX, getX2, getY, getY2, hadParentScrolled, handleGeographicalFocusChangeKeys, hasFocus, internalSetEnabled, intXYWH, isActionEvent, isChildOf, isDisplayed, isEnabled, isFloating, isInsideOrNear, isObscured, isTopMost, isVisible, isVisibleAndInside, onColorsChanged, onFontChanged, onWindowPaintFinished, post, postEvent, postPressedEvent, releaseScreenShot, removeEnabledStateListener, removeFocusListener, removeGridListener, removeHandler, removeHighlightListener, removeKeyListener, removeListContainerListener, removeMouseListener, removeMultiTouchListener, removePenListener, removePressListener, removePushNotificationListener, removeTimer, removeTimerListener, removeWindowListener, repaint, repaintNow, reposition, reposition, repositionChildren, requestFocus, resetSetPositions, resetStyle, safeRepaintNow, safeUpdateScreen, sendToBack, setBackColor, setBackForeColors, setDoEffect, setEnabled, setFloating, setFocusLess, setFont, setForeColor, setNinePatch, setNinePatch, setRect, setRect, setRect, setRect, setSet, setTextShadowColor, setTranslucent, setVisible, showTip, takeInitialScreenShot, takeScreenShot, translateFromOrigin, uiStyleChanged, updateScreen, updateTemporary, willOpenKeyboard

Methods inherited from class java.lang.Object

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

Field Detail

borderColor

public int borderColor

Set this to some color so a frame can be drawn around the image

useAA

@Deprecated
public boolean useAA

Deprecated.

This field is useless in OpenGL platforms

Set to true to enable antialiase on the line drawing. It must be set right after the constructor.

thick

public boolean thick

Set to true to draw a thick line.

Since:

TotalCross 1.14

Constructor Detail

Whiteboard

public Whiteboard()

Constructs a new whiteboard, setting the back color to white.

Method Detail

onBoundsChanged

public void onBoundsChanged(boolean screenChanged)

Now that we know our bounds, we can create the image that will hold the drawing

Overrides:

onBoundsChanged in class Control

Parameters:

screenChanged - If the bounds were changed due to a screen change (rotation, collapse)

getImage

public Image getImage()

Returns the image where the drawing is taking place.

getPreferredWidth

public int getPreferredWidth()

Returns the preferred width: FILL

Overrides:

getPreferredWidth in class Control

getPreferredHeight

public int getPreferredHeight()

Returns the preferred height: FILL

Overrides:

getPreferredHeight in class Control

setImage

public void setImage(Image image)
              throws ImageException

Sets the image for this WhiteBoard. Pass null to create an empty image.

Throws:

ImageException

clear

public void clear()

Clears the WhiteBoard to the current background color.

Overrides:

clear in class Control

setPenColor

public void setPenColor(int c)

Sets the drawing pen color

getPenColor

public int getPenColor()

Returns the drawing pen color.

onPaint

public void onPaint(Graphics g)

Description copied from class: Control

Called to draw the control. When this method is called, the graphics object passed has been translated into the coordinate system of the control and the area behind the control has already been painted.

Overrides:

onPaint in class Control

Parameters:

g - the graphics object for drawing

See Also:

Graphics

onEvent

public void onEvent(Event event)

Description copied from class: Control

Called to process key, pen, control and other posted events.

Overrides:

onEvent in class Control

Parameters:

event - the event to process

See Also:

Event, KeyEvent, PenEvent