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range preference

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serso 2011-09-19 16:00:22 +04:00
parent ece3d053ff
commit d999d8b9df
5 changed files with 478 additions and 53 deletions
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src/main/java/org/solovyev/android/view/prefs/IntervalPreference.java
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package org.solovyev.android.view.prefs;
import android.content.Context;
import android.preference.DialogPreference;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.TextView;
import org.jetbrains.annotations.NotNull;
import org.solovyev.android.view.widgets.NumberPicker;
/**
* User: serso
* Date: 9/19/11
* Time: 12:27 PM
*/
public class IntervalPreference extends AbstractDialogPreference implements NumberPicker.OnChangedListener {
@NotNull
private final NumberPicker leftBorder;
@NotNull
private final NumberPicker rightBorder;
public IntervalPreference(@NotNull Context context, AttributeSet attrs) {
super(context, attrs);
this.leftBorder = new NumberPicker(context);
this.rightBorder = new NumberPicker(context);
}
@Override
public void onChanged(NumberPicker picker, int oldVal, int newVal) {
/* if (shouldPersist())
persistString(value);
callChangeListener(new Integer(value));*/
}
@Override
protected LinearLayout onCreateDialogView() {
final LinearLayout result = super.onCreateDialogView();
final LinearLayout horizontal = new LinearLayout(context);
horizontal.setOrientation(LinearLayout.HORIZONTAL);
horizontal.addView(leftBorder);
horizontal.addView(rightBorder);
return result;
}
}

45
src/main/java/org/solovyev/android/view/prefs/RangeSeekPreference.java Normal file
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package org.solovyev.android.view.prefs;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.LinearLayout;
import org.jetbrains.annotations.NotNull;
import org.solovyev.android.view.widgets.NumberPicker;
import org.solovyev.android.view.widgets.RangeSeekBar;
/**
* User: serso
* Date: 9/19/11
* Time: 12:27 PM
*/
public abstract class RangeSeekPreference<T extends Number> extends AbstractDialogPreference implements RangeSeekBar.OnRangeSeekBarChangeListener<T> {
@NotNull
private final RangeSeekBar<T> rangeSeekBar;
public RangeSeekPreference(@NotNull Context context, AttributeSet attrs) {
super(context, attrs);
this.rangeSeekBar = new RangeSeekBar<T>(getMinValue(), getMaxValue(), context);
rangeSeekBar.setOnRangeSeekBarChangeListener(this);
}
@NotNull
abstract T getMinValue();
@NotNull
abstract T getMaxValue();
@Override
protected LinearLayout onCreateDialogView() {
final LinearLayout result = super.onCreateDialogView();
result.addView(rangeSeekBar);
return result;
}
@Override
public void rangeSeekBarValuesChanged(T minValue, T maxValue) {
//To change body of implemented methods use File | Settings | File Templates.
}
}

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src/main/java/org/solovyev/android/view/widgets/RangeSeekBar.java Normal file
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package org.solovyev.android.view.widgets;
/**
* User: serso
* Date: 9/19/11
* Time: 3:30 PM
*/
import android.content.Context;
import android.graphics.*;
import android.graphics.Paint.Style;
import android.view.MotionEvent;
import android.widget.ImageView;
import org.jetbrains.annotations.NotNull;
import org.solovyev.android.calculator.R;
import java.math.BigDecimal;
/**
* Widget that lets users select a minimum and maximum value on a given numerical range.
* The range value types can be one of Long, Double, Integer, Float, Short, Byte or BigDecimal.
*
* @param <T> The Number type of the range values. One of Long, Double, Integer, Float, Short, Byte or BigDecimal.
* @author Stephan Tittel (stephan.tittel@kom.tu-darmstadt.de)
*/
public class RangeSeekBar<T extends Number> extends ImageView {
@NotNull
private final Paint paint = new Paint();
@NotNull
private final Bitmap thumbImage = BitmapFactory.decodeResource(getResources(), R.drawable.seek_thumb_normal);
@NotNull
private final Bitmap thumbPressedImage = BitmapFactory.decodeResource(getResources(), R.drawable.seek_thumb_pressed);
private final float thumbWidth = thumbImage.getWidth();
private final float thumbHalfWidth = 0.5f * thumbWidth;
private final float thumbHalfHeight = 0.5f * thumbImage.getHeight();
private final float lineHeight = 0.3f * thumbHalfHeight;
private final float padding = thumbHalfWidth;
@NotNull
private final T minValue, maxValue;
@NotNull
private final NumberType numberType;
private final double dMinValue, dMaxValue;
private double normalizedMinValue = 0d;
private double normalizedMaxValue = 1d;
private Thumb pressedThumb = null;
private boolean notifyWhileDragging = false;
private OnRangeSeekBarChangeListener<T> listener;
/**
* Creates a new RangeSeekBar.
*
* @param minValue The minimum value of the selectable range.
* @param maxValue The maximum value of the selectable range.
* @param context
* @throws IllegalArgumentException Will be thrown if min/max value types are not one of Long, Double, Integer, Float, Short, Byte or BigDecimal.
*/
public RangeSeekBar(@NotNull T minValue, @NotNull T maxValue, Context context) throws IllegalArgumentException {
super(context);
this.minValue = minValue;
this.maxValue = maxValue;
dMinValue = minValue.doubleValue();
dMaxValue = maxValue.doubleValue();
numberType = NumberType.fromNumber(minValue);
}
public boolean isNotifyWhileDragging() {
return notifyWhileDragging;
}
/**
* Should the widget notify the listener callback while the user is still dragging a thumb? Default is false.
*
* @param flag
*/
public void setNotifyWhileDragging(boolean flag) {
this.notifyWhileDragging = flag;
}
/**
* Returns the absolute minimum value of the range that has been set at construction time.
*
* @return The absolute minimum value of the range.
*/
@NotNull
public T getMinValue() {
return minValue;
}
/**
* Returns the absolute maximum value of the range that has been set at construction time.
*
* @return The absolute maximum value of the range.
*/
@NotNull
public T getMaxValue() {
return maxValue;
}
/**
* Returns the currently selected min value.
*
* @return The currently selected min value.
*/
public T getSelectedMinValue() {
return normalizedToValue(normalizedMinValue);
}
/**
* Sets the currently selected minimum value. The widget will be invalidated and redrawn.
*
* @param value The Number value to set the minimum value to. Will be clamped to given absolute minimum/maximum range.
*/
public void setSelectedMinValue(T value) {
// in case absoluteMinValue == absoluteMaxValue, avoid division by zero when normalizing.
if (0 == (dMaxValue - dMinValue)) {
setNormalizedMinValue(0d);
} else {
setNormalizedMinValue(normalizeValue(value));
}
}
/**
* Returns the currently selected max value.
*
* @return The currently selected max value.
*/
public T getSelectedMaxValue() {
return normalizedToValue(normalizedMaxValue);
}
/**
* Sets the currently selected maximum value. The widget will be invalidated and redrawn.
*
* @param value The Number value to set the maximum value to. Will be clamped to given absolute minimum/maximum range.
*/
public void setSelectedMaxValue(T value) {
// in case absoluteMinValue == absoluteMaxValue, avoid division by zero when normalizing.
if (0 == (dMaxValue - dMinValue)) {
setNormalizedMaxValue(1d);
} else {
setNormalizedMaxValue(normalizeValue(value));
}
}
/**
* Registers given listener callback to notify about changed selected values.
*
* @param listener The listener to notify about changed selected values.
*/
public void setOnRangeSeekBarChangeListener(OnRangeSeekBarChangeListener<T> listener) {
this.listener = listener;
}
/**
* Handles thumb selection and movement. Notifies listener callback on certain events.
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
pressedThumb = evalPressedThumb(event.getX());
invalidate();
break;
case MotionEvent.ACTION_MOVE:
if (pressedThumb != null) {
if (Thumb.MIN.equals(pressedThumb)) {
setNormalizedMinValue(convertToNormalizedValue(event.getX()));
} else if (Thumb.MAX.equals(pressedThumb)) {
setNormalizedMaxValue(convertToNormalizedValue(event.getX()));
}
if (notifyWhileDragging && listener != null) {
listener.rangeSeekBarValuesChanged(getSelectedMinValue(), getSelectedMaxValue());
}
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
pressedThumb = null;
invalidate();
if (listener != null) {
listener.rangeSeekBarValuesChanged(getSelectedMinValue(), getSelectedMaxValue());
}
break;
}
return true;
}
/**
* Ensures correct size of the widget.
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = 200;
if (MeasureSpec.UNSPECIFIED != MeasureSpec.getMode(widthMeasureSpec)) {
width = MeasureSpec.getSize(widthMeasureSpec);
}
int height = thumbImage.getHeight();
if (MeasureSpec.UNSPECIFIED != MeasureSpec.getMode(heightMeasureSpec)) {
height = Math.min(height, MeasureSpec.getSize(heightMeasureSpec));
}
setMeasuredDimension(width, height);
}
/**
* Draws the widget on the given canvas.
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// draw seek bar background line
final RectF rect = new RectF(padding, 0.5f * (getHeight() - lineHeight), getWidth() - padding, 0.5f * (getHeight() + lineHeight));
paint.setStyle(Style.FILL);
paint.setColor(Color.GRAY);
canvas.drawRect(rect, paint);
// draw seek bar active range line
rect.left = convertToScreenValue(normalizedMinValue);
rect.right = convertToScreenValue(normalizedMaxValue);
// orange color
paint.setColor(Color.rgb(255, 165, 0));
canvas.drawRect(rect, paint);
// draw minimum thumb
drawThumb(convertToScreenValue(normalizedMinValue), Thumb.MIN == pressedThumb, canvas);
// draw maximum thumb
drawThumb(convertToScreenValue(normalizedMaxValue), Thumb.MAX == pressedThumb, canvas);
}
/**
* Draws the "normal" resp. "pressed" thumb image on specified x-coordinate.
*
* @param normalizedToScreenValue The x-coordinate in screen space where to draw the image.
* @param pressed Is the thumb currently in "pressed" state?
* @param canvas The canvas to draw upon.
*/
private void drawThumb(float normalizedToScreenValue, boolean pressed, Canvas canvas) {
canvas.drawBitmap(pressed ? thumbPressedImage : thumbImage, normalizedToScreenValue - thumbHalfWidth, (float) ((0.5f * getHeight()) - thumbHalfHeight), paint);
}
/**
* Decides which (if any) thumb is touched by the given x-coordinate.
*
* @param touchX The x-coordinate of a touch event in screen space.
* @return The pressed thumb or null if none has been touched.
*/
private Thumb evalPressedThumb(float touchX) {
Thumb result = null;
boolean minThumbPressed = isInThumbRange(touchX, normalizedMinValue);
boolean maxThumbPressed = isInThumbRange(touchX, normalizedMaxValue);
if (minThumbPressed && maxThumbPressed) {
// if both thumbs are pressed (they lie on top of each other), choose the one with more room to drag. this avoids "stalling" the thumbs in a corner, not being able to drag them apart anymore.
result = (touchX / getWidth() > 0.5f) ? Thumb.MIN : Thumb.MAX;
} else if (minThumbPressed) {
result = Thumb.MIN;
} else if (maxThumbPressed) {
result = Thumb.MAX;
}
return result;
}
/**
* Decides if given x-coordinate in screen space needs to be interpreted as "within" the normalized thumb x-coordinate.
*
* @param touchX The x-coordinate in screen space to check.
* @param normalizedThumbValue The normalized x-coordinate of the thumb to check.
* @return true if x-coordinate is in thumb range, false otherwise.
*/
private boolean isInThumbRange(float touchX, double normalizedThumbValue) {
return Math.abs(touchX - convertToScreenValue(normalizedThumbValue)) <= thumbHalfWidth;
}
/**
* Sets normalized min value to value so that 0 <= value <= normalized max value <= 1.
* The View will get invalidated when calling this method.
*
* @param value The new normalized min value to set.
*/
private void setNormalizedMinValue(double value) {
normalizedMinValue = Math.max(0d, Math.min(1d, Math.min(value, normalizedMaxValue)));
invalidate();
}
/**
* Sets normalized max value to value so that 0 <= normalized min value <= value <= 1.
* The View will get invalidated when calling this method.
*
* @param value The new normalized max value to set.
*/
private void setNormalizedMaxValue(double value) {
normalizedMaxValue = Math.max(0d, Math.min(1d, Math.max(value, normalizedMinValue)));
invalidate();
}
/**
* Converts a normalized value to a Number object in the value space between absolute minimum and maximum.
*
* @param normalized
* @return
*/
@SuppressWarnings("unchecked")
private T normalizedToValue(double normalized) {
return (T) numberType.toNumber(dMinValue + normalized * (dMaxValue - dMinValue));
}
/**
* Converts the given Number value to a normalized double.
*
* @param value The Number value to normalize.
* @return The normalized double.
*/
private double normalizeValue(T value) {
assert 0 != dMaxValue - dMinValue;
return (value.doubleValue() - dMinValue) / (dMaxValue - dMinValue);
}
/**
* Converts a normalized value into screen space.
*
* @param normalizedValue The normalized value to convert.
* @return The converted value in screen space.
*/
private float convertToScreenValue(double normalizedValue) {
return (float) (padding + normalizedValue * (getWidth() - 2 * padding));
}
/**
* Converts screen space x-coordinates into normalized values.
*
* @param screenValue The x-coordinate in screen space to convert.
* @return The normalized value.
*/
private double convertToNormalizedValue(float screenValue) {
int width = getWidth();
if (width <= 2 * padding) {
// prevent division by zero, simply return 0.
return 0d;
} else {
double result = (screenValue - padding) / (width - 2 * padding);
return Math.min(1d, Math.max(0d, result));
}
}
/**
* Callback listener interface to notify about changed range values.
*
* @param <T> The Number type the RangeSeekBar has been declared with.
* @author Stephan Tittel (stephan.tittel@kom.tu-darmstadt.de)
*/
public interface OnRangeSeekBarChangeListener<T> {
void rangeSeekBarValuesChanged(T minValue, T maxValue);
}
/**
* Thumb constants (min and max).
*
* @author Stephan Tittel (stephan.tittel@kom.tu-darmstadt.de)
*/
private static enum Thumb {
MIN, MAX
}
/**
* Utility enumaration used to convert between Numbers and doubles.
*
* @author Stephan Tittel (stephan.tittel@kom.tu-darmstadt.de)
*/
private static enum NumberType {
LONG(Long.class),
DOUBLE(Double.class),
INTEGER(Integer.class),
FLOAT(Float.class),
SHORT(Short.class),
BYTE(Byte.class),
BIG_DECIMAL(BigDecimal.class);
@NotNull
private final Class underlyingClass;
private NumberType(@NotNull Class underlyingClass) {
this.underlyingClass = underlyingClass;
}
@NotNull
public static <E extends Number> NumberType fromNumber(E value) throws IllegalArgumentException {
for (NumberType numberType : NumberType.values()) {
if ( numberType.underlyingClass.isInstance(value) ) {
return numberType;
}
}
throw new IllegalArgumentException("Number class '" + value.getClass().getName() + "' is not supported");
}
public Number toNumber(double value) {
switch (this) {
case LONG:
return (long) value;
case DOUBLE:
return value;
case INTEGER:
return (int)value;
case FLOAT:
return (float)value;
case SHORT:
return (short)value;
case BYTE:
return (byte)value;
case BIG_DECIMAL:
return new BigDecimal(value);
}
throw new InstantiationError("can't convert " + this + " to a Number object");
}
}
}