Blackberry Slider

Question

Je suis intéressé par un curseur glissable dans mon application BlackBerry.

Je me demande s'il y a quelque chose comme ça dans l'API BlackBerry, ou si quelqu'un a fait quelque chose comme ça!

Answer 1

Il y a un GaugeField -

Et voici an example de celui-ci avec bimaps -

Answer 2

Voici le code pour le champ curseur, vous devez utiliser votre propre ".png" images comme je ne peux pas les joindre ici avec, maintenant ce que vous devez faire est de faire une classe avec le nom SliderField et coller ce code dans cette classe et passer les arguments:

package mypackage; 

import java.lang.Math; 

import net.rim.device.api.system.*; 
import net.rim.device.api.ui.*; 

public class SliderField extends Field 
{ 
Bitmap _imageThumb; 

Bitmap _imageSlider; 
Bitmap _imageSliderLeft; 
Bitmap _imageSliderCenter; 
Bitmap _imageSliderRight; 

Bitmap _imageSliderFocus; 
Bitmap _imageSliderFocusLeft; 
Bitmap _imageSliderFocusCenter; 
Bitmap _imageSliderFocusRight; 

private int _numStates; 
private int _currentState; 
private boolean _selected; 

private int _xLeftBackMargin; 
private int _xRightBackMargin; 

private int _thumbWidth; 
private int _thumbHeight; 

private int _totalHeight; 
private int _totalWidth; 

private int _rop; 

private int _backgroundColours[]; 
private int _backgroundSelectedColours[]; 

private int _defaultSelectColour = 0x977DED; 
private int _defaultBackgroundColour = 0x000000; 
private int _defaultHoverColour = 0x999999; 


public SliderField(Bitmap thumb 
      , Bitmap sliderBackground 
      , int numStates 
      , int initialState 
      , int xLeftBackMargin 
      , int xRightBackMargin) 
{ 
    this(thumb, sliderBackground, sliderBackground, numStates, initialState, xLeftBackMargin, xRightBackMargin, FOCUSABLE); 
} 

public SliderField(Bitmap thumb 
      , Bitmap sliderBackground 
      , int numStates 
      , int initialState 
      , int xLeftBackMargin 
      , int xRightBackMargin 
      , long style) 
{ 
    this(thumb, sliderBackground, sliderBackground, numStates, initialState, xLeftBackMargin, xRightBackMargin, style); 
} 

public SliderField(Bitmap thumb 
      , Bitmap sliderBackground 
      , Bitmap sliderBackgroundFocus 
      , int numStates 
      , int initialState 
      , int xLeftBackMargin 
      , int xRightBackMargin) 
{ 
    this(thumb, sliderBackground, sliderBackgroundFocus, numStates, initialState, xLeftBackMargin, xRightBackMargin, FOCUSABLE); 
} 

public SliderField(Bitmap thumb 
      , Bitmap sliderBackground 
      , Bitmap sliderBackgroundFocus 
      , int numStates 
      , int initialState 
      , int xLeftBackMargin 
      , int xRightBackMargin 
      , long style) 
{ 
    super(style); 

    if(initialState > numStates || numStates < 2){ 
    } 
    _imageThumb = thumb; 
    _imageSlider = sliderBackground; 
    _imageSliderFocus = sliderBackgroundFocus; 
    _numStates = numStates; 
    setState(initialState); 

    _xLeftBackMargin = xLeftBackMargin; 
    _xRightBackMargin = xRightBackMargin; 

    _rop = _imageSlider.hasAlpha() ? Graphics.ROP_SRC_ALPHA : Graphics.ROP_SRC_COPY; 

    _thumbWidth = thumb.getWidth(); 
    _thumbHeight = thumb.getHeight(); 
    initBitmaps(); 
}    
public SliderField(Bitmap thumb 
      , Bitmap sliderBackground 
      , int numStates 
      , int initialState 
      , int xLeftBackMargin 
      , int xRightBackMargin 
      , int[] colours 
      , int[] selectColours) 
{ 
    this(thumb, sliderBackground, sliderBackground, numStates, initialState, xLeftBackMargin, xRightBackMargin, FOCUSABLE); 

    if(colours.length != numStates+1){ 
     throw new IllegalArgumentException(); 
    } 
    _backgroundColours = colours; 
    _backgroundSelectedColours = selectColours; 
} 
public void initBitmaps() 
{ 
    int height = _imageSlider.getHeight(); 

    _imageSliderLeft = new Bitmap(_xLeftBackMargin, height); 
    _imageSliderCenter = new Bitmap(_imageSlider.getWidth() - _xRightBackMargin - _xLeftBackMargin, height); 
    _imageSliderRight = new Bitmap(_xRightBackMargin, height); 

    copy(_imageSlider, 0, 0, _xLeftBackMargin, height, _imageSliderLeft); 
    copy(_imageSlider, _xLeftBackMargin, 0, _imageSlider.getWidth() - _xRightBackMargin - _xLeftBackMargin, height, _imageSliderCenter); 
    copy(_imageSlider, _imageSlider.getWidth() - _xRightBackMargin, 0, _xRightBackMargin, height, _imageSliderRight); 

    _imageSliderFocusLeft = new Bitmap(_xLeftBackMargin, height); 
    _imageSliderFocusCenter = new Bitmap(_imageSlider.getWidth() - _xRightBackMargin - _xLeftBackMargin, height); 
    _imageSliderFocusRight = new Bitmap(_xRightBackMargin, height); 

    copy(_imageSliderFocus, 0, 0, _xLeftBackMargin, height, _imageSliderFocusLeft); 
    copy(_imageSliderFocus, _xLeftBackMargin, 0, _imageSlider.getWidth() - _xRightBackMargin - _xLeftBackMargin, height, _imageSliderFocusCenter); 
    copy(_imageSliderFocus, _imageSlider.getWidth() - _xRightBackMargin, 0, _xRightBackMargin, height, _imageSliderFocusRight); 
} 
private void copy(Bitmap src, int x, int y, int width, int height, Bitmap dest) { 
    int[] argbData = new int[width * height]; 
    src.getARGB(argbData, 0, width, x, y, width, height); 
    for(int tx = 0; tx < dest.getWidth(); tx += width) { 
     for(int ty = 0; ty < dest.getHeight(); ty += height) { 
      dest.setARGB(argbData, 0, width, tx, ty, width, height); 
     } 
    } 
} 
public void setState(int newState) { 
    if(newState > _numStates){ 
     throw new IllegalArgumentException(); 
    } else { 
     _currentState = newState; 
     invalidate(); 
    } 
} 
public int getState() { 
    return _currentState; 
} 
public int getNumStates() { 
    return _numStates; 
} 
public int getColour() { 
    if(_backgroundSelectedColours != null) { 
     return _backgroundSelectedColours[getState()]; 
    } 
    return 0x000000; 
} 

public int getPreferredWidth() { 
    return _totalWidth; 
} 

public int getPreferredHeight() { 
    return _totalHeight; 
} 
protected void layout(int width, int height) { 
    if (width < 0 || height < 0) 
     throw new IllegalArgumentException(); 
    _totalWidth = width; 
    _totalHeight = Math.max(_imageSlider.getHeight(), _imageThumb.getHeight()); 

    setExtent(_totalWidth, _totalHeight); 
} 

public void paint(Graphics g) 
{ 
    int sliderHeight = _imageSlider.getHeight(); 
    int sliderBackYOffset = (_totalHeight - sliderHeight) >> 1; 
    int backgroundColor = _defaultBackgroundColour; 
    if(_backgroundSelectedColours != null || _backgroundColours != null) { 

     if(_selected) { 
      backgroundColor = _backgroundSelectedColours != null ? _backgroundSelectedColours[getState()] : _defaultSelectColour; 
     } else if(g.isDrawingStyleSet(Graphics.DRAWSTYLE_FOCUS)) { 
      backgroundColor = _backgroundColours != null ? _backgroundColours[getState()] : _defaultHoverColour; 
     } else { 
      backgroundColor = _defaultBackgroundColour; 
     } 
    } 
    g.setColor(backgroundColor); 
    g.fillRect(1, sliderBackYOffset + 1, _totalWidth - 2, sliderHeight - 2); 

    if(g.isDrawingStyleSet(Graphics.DRAWSTYLE_FOCUS)) {  
     paintSliderBackground(g, _imageSliderFocusLeft, _imageSliderFocusCenter, _imageSliderFocusRight); 
    } else { 
     paintSliderBackground(g, _imageSliderLeft, _imageSliderCenter, _imageSliderRight); 
    } 
    int thumbXOffset = ((_totalWidth - _thumbWidth) * _currentState)/_numStates; 
    g.drawBitmap(thumbXOffset, (_totalHeight - _thumbHeight) >> 1, _thumbWidth, _thumbHeight, _imageThumb, 0, 0); 
} 

private void paintSliderBackground(Graphics g, Bitmap left, Bitmap middle, Bitmap right) 
{ 
    int sliderHeight = _imageSlider.getHeight(); 
    int sliderBackYOffset = (_totalHeight - sliderHeight) >> 1; 
    g.drawBitmap(0, sliderBackYOffset, _xLeftBackMargin, sliderHeight, left, 0, 0); 
    g.tileRop(_rop, _xRightBackMargin, sliderBackYOffset, _totalWidth - _xLeftBackMargin - _xRightBackMargin, sliderHeight, middle, 0, 0); 
    g.drawBitmap(_totalWidth - _xRightBackMargin, sliderBackYOffset, _xRightBackMargin, sliderHeight, right, 0, 0); 
} 

public void paintBackground(Graphics g) 
{ 
} 

protected void drawFocus(Graphics g, boolean on) 
{ 
    boolean oldDrawStyleFocus = g.isDrawingStyleSet(Graphics.DRAWSTYLE_FOCUS); 
    try { 
     if(on) { 
      g.setDrawingStyle(Graphics.DRAWSTYLE_FOCUS, true); 
     } 
     paint(g); 
    } finally { 
     g.setDrawingStyle(Graphics.DRAWSTYLE_FOCUS, oldDrawStyleFocus); 
    } 
} 
protected boolean touchEvent(TouchEvent message) 
{ 
    boolean isConsumed = false; 
    boolean isOutOfBounds = false; 
    int x = message.getX(1); 
    int y = message.getY(1); 
    if(x < 0 || y < 0 || x > getExtent().width || y > getExtent().height) { 
     isOutOfBounds = true; 
    } 
    switch(message.getEvent()) { 
     case TouchEvent.CLICK: 
     case TouchEvent.MOVE: 
      if(isOutOfBounds) return true; 
      _selected = true; 

      int stateWidth = getExtent().width/_numStates; 
      int numerator = x/stateWidth; 
      int denominator = x % stateWidth; 
      if(denominator > stateWidth/2) { 
       numerator++; 
      } 
      _currentState = numerator; 
      invalidate(); 

      isConsumed = true; 
      break; 
     case TouchEvent.UNCLICK: 
      if(isOutOfBounds) { 
       _selected = false; 
       return true; 
      } 
      _selected = false; 
      stateWidth = getExtent().width/_numStates; 
      numerator = x/stateWidth; 
      denominator = x % stateWidth; 
      if(denominator > stateWidth/2) { 
       numerator++; 
      } 
      _currentState = numerator; 
      invalidate(); 
      fieldChangeNotify(0); 
      isConsumed = true; 
      break; 
    } 
    return isConsumed; 
} 
protected boolean navigationMovement(int dx, int dy, int status, int time) 
{ 
    if(_selected) 
    { 
     if(dx > 0 || dy > 0) { 
      incrementState(); 
      fieldChangeNotify(0); 
      return true; 
     } else if(dx < 0 || dy < 0) { 
      decrementState(); 
      fieldChangeNotify(0); 
      return true; 
     } 
    } 
    return super.navigationMovement(dx, dy, status, time); 
} 
public void decrementState() { 
    if(_currentState > 0) { 
     _currentState--; 
     invalidate(); 
    } 
} 
public void incrementState() { 
    if(_currentState < _numStates) { 
     _currentState++; 
     invalidate(); 
    } 
} 
protected boolean invokeAction(int action) { 
    switch(action) { 
     case ACTION_INVOKE: { 
      toggleSelected(); 
      return true; 
     } 
    } 
    return false; 
} 
protected boolean keyChar(char key, int status, int time) { 
    if(key == Characters.SPACE || key == Characters.ENTER) { 
     toggleSelected(); 
     return true; 
    } 

    return false; 
} 
protected boolean trackwheelClick(int status, int time) { 
    if(isEditable()) { 
     toggleSelected(); 
     return true; 
    } 
    return super.trackwheelClick(status, time); 
} 
private void toggleSelected() { 
    _selected = !_selected; 
    invalidate(); 
} 
public void setDirty(boolean dirty) 
{ 
} 
public void setMuddy(boolean muddy) 
{ 
} 

}