range preference
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res/drawable/seek_thumb_normal.png
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res/drawable/seek_thumb_normal.png
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res/drawable/seek_thumb_pressed.png
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package org.solovyev.android.view.prefs;
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import android.content.Context;
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import android.preference.DialogPreference;
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import android.util.AttributeSet;
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import android.view.Gravity;
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import android.view.View;
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import android.widget.LinearLayout;
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import android.widget.SeekBar;
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import android.widget.TextView;
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import org.jetbrains.annotations.NotNull;
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import org.solovyev.android.view.widgets.NumberPicker;
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/**
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* User: serso
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* Date: 9/19/11
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* Time: 12:27 PM
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*/
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public class IntervalPreference extends AbstractDialogPreference implements NumberPicker.OnChangedListener {
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@NotNull
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private final NumberPicker leftBorder;
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@NotNull
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private final NumberPicker rightBorder;
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public IntervalPreference(@NotNull Context context, AttributeSet attrs) {
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super(context, attrs);
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this.leftBorder = new NumberPicker(context);
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this.rightBorder = new NumberPicker(context);
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}
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@Override
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public void onChanged(NumberPicker picker, int oldVal, int newVal) {
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/* if (shouldPersist())
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persistString(value);
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callChangeListener(new Integer(value));*/
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}
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@Override
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protected LinearLayout onCreateDialogView() {
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final LinearLayout result = super.onCreateDialogView();
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final LinearLayout horizontal = new LinearLayout(context);
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horizontal.setOrientation(LinearLayout.HORIZONTAL);
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horizontal.addView(leftBorder);
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horizontal.addView(rightBorder);
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return result;
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}
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}
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@ -0,0 +1,45 @@
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package org.solovyev.android.view.prefs;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.widget.LinearLayout;
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import org.jetbrains.annotations.NotNull;
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import org.solovyev.android.view.widgets.NumberPicker;
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import org.solovyev.android.view.widgets.RangeSeekBar;
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/**
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* User: serso
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* Date: 9/19/11
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* Time: 12:27 PM
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*/
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public abstract class RangeSeekPreference<T extends Number> extends AbstractDialogPreference implements RangeSeekBar.OnRangeSeekBarChangeListener<T> {
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@NotNull
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private final RangeSeekBar<T> rangeSeekBar;
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public RangeSeekPreference(@NotNull Context context, AttributeSet attrs) {
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super(context, attrs);
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this.rangeSeekBar = new RangeSeekBar<T>(getMinValue(), getMaxValue(), context);
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rangeSeekBar.setOnRangeSeekBarChangeListener(this);
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}
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@NotNull
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abstract T getMinValue();
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@NotNull
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abstract T getMaxValue();
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@Override
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protected LinearLayout onCreateDialogView() {
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final LinearLayout result = super.onCreateDialogView();
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result.addView(rangeSeekBar);
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return result;
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}
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@Override
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public void rangeSeekBarValuesChanged(T minValue, T maxValue) {
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//To change body of implemented methods use File | Settings | File Templates.
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}
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}
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package org.solovyev.android.view.widgets;
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/**
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* User: serso
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* Date: 9/19/11
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* Time: 3:30 PM
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*/
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import android.content.Context;
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import android.graphics.*;
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import android.graphics.Paint.Style;
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import android.view.MotionEvent;
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import android.widget.ImageView;
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import org.jetbrains.annotations.NotNull;
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import org.solovyev.android.calculator.R;
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import java.math.BigDecimal;
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/**
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* Widget that lets users select a minimum and maximum value on a given numerical range.
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* The range value types can be one of Long, Double, Integer, Float, Short, Byte or BigDecimal.
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*
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* @param <T> The Number type of the range values. One of Long, Double, Integer, Float, Short, Byte or BigDecimal.
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* @author Stephan Tittel (stephan.tittel@kom.tu-darmstadt.de)
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*/
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public class RangeSeekBar<T extends Number> extends ImageView {
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@NotNull
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private final Paint paint = new Paint();
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@NotNull
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private final Bitmap thumbImage = BitmapFactory.decodeResource(getResources(), R.drawable.seek_thumb_normal);
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@NotNull
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private final Bitmap thumbPressedImage = BitmapFactory.decodeResource(getResources(), R.drawable.seek_thumb_pressed);
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private final float thumbWidth = thumbImage.getWidth();
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private final float thumbHalfWidth = 0.5f * thumbWidth;
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private final float thumbHalfHeight = 0.5f * thumbImage.getHeight();
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private final float lineHeight = 0.3f * thumbHalfHeight;
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private final float padding = thumbHalfWidth;
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@NotNull
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private final T minValue, maxValue;
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@NotNull
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private final NumberType numberType;
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private final double dMinValue, dMaxValue;
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private double normalizedMinValue = 0d;
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private double normalizedMaxValue = 1d;
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private Thumb pressedThumb = null;
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private boolean notifyWhileDragging = false;
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private OnRangeSeekBarChangeListener<T> listener;
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/**
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* Creates a new RangeSeekBar.
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*
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* @param minValue The minimum value of the selectable range.
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* @param maxValue The maximum value of the selectable range.
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* @param context
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* @throws IllegalArgumentException Will be thrown if min/max value types are not one of Long, Double, Integer, Float, Short, Byte or BigDecimal.
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*/
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public RangeSeekBar(@NotNull T minValue, @NotNull T maxValue, Context context) throws IllegalArgumentException {
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super(context);
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this.minValue = minValue;
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this.maxValue = maxValue;
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dMinValue = minValue.doubleValue();
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dMaxValue = maxValue.doubleValue();
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numberType = NumberType.fromNumber(minValue);
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}
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public boolean isNotifyWhileDragging() {
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return notifyWhileDragging;
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}
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/**
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* Should the widget notify the listener callback while the user is still dragging a thumb? Default is false.
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*
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* @param flag
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*/
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public void setNotifyWhileDragging(boolean flag) {
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this.notifyWhileDragging = flag;
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}
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/**
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* Returns the absolute minimum value of the range that has been set at construction time.
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*
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* @return The absolute minimum value of the range.
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*/
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@NotNull
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public T getMinValue() {
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return minValue;
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}
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/**
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* Returns the absolute maximum value of the range that has been set at construction time.
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*
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* @return The absolute maximum value of the range.
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*/
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@NotNull
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public T getMaxValue() {
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return maxValue;
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}
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/**
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* Returns the currently selected min value.
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*
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* @return The currently selected min value.
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*/
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public T getSelectedMinValue() {
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return normalizedToValue(normalizedMinValue);
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}
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/**
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* Sets the currently selected minimum value. The widget will be invalidated and redrawn.
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*
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* @param value The Number value to set the minimum value to. Will be clamped to given absolute minimum/maximum range.
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*/
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public void setSelectedMinValue(T value) {
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// in case absoluteMinValue == absoluteMaxValue, avoid division by zero when normalizing.
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if (0 == (dMaxValue - dMinValue)) {
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setNormalizedMinValue(0d);
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} else {
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setNormalizedMinValue(normalizeValue(value));
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}
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}
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/**
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* Returns the currently selected max value.
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*
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* @return The currently selected max value.
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*/
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public T getSelectedMaxValue() {
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return normalizedToValue(normalizedMaxValue);
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}
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/**
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* Sets the currently selected maximum value. The widget will be invalidated and redrawn.
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*
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* @param value The Number value to set the maximum value to. Will be clamped to given absolute minimum/maximum range.
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*/
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public void setSelectedMaxValue(T value) {
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// in case absoluteMinValue == absoluteMaxValue, avoid division by zero when normalizing.
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if (0 == (dMaxValue - dMinValue)) {
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setNormalizedMaxValue(1d);
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} else {
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setNormalizedMaxValue(normalizeValue(value));
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}
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}
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/**
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* Registers given listener callback to notify about changed selected values.
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*
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* @param listener The listener to notify about changed selected values.
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*/
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public void setOnRangeSeekBarChangeListener(OnRangeSeekBarChangeListener<T> listener) {
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this.listener = listener;
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}
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/**
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* Handles thumb selection and movement. Notifies listener callback on certain events.
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*/
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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switch (event.getAction()) {
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case MotionEvent.ACTION_DOWN:
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pressedThumb = evalPressedThumb(event.getX());
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invalidate();
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break;
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case MotionEvent.ACTION_MOVE:
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if (pressedThumb != null) {
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if (Thumb.MIN.equals(pressedThumb)) {
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setNormalizedMinValue(convertToNormalizedValue(event.getX()));
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} else if (Thumb.MAX.equals(pressedThumb)) {
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setNormalizedMaxValue(convertToNormalizedValue(event.getX()));
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}
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if (notifyWhileDragging && listener != null) {
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listener.rangeSeekBarValuesChanged(getSelectedMinValue(), getSelectedMaxValue());
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}
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}
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break;
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL:
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pressedThumb = null;
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invalidate();
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if (listener != null) {
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listener.rangeSeekBarValuesChanged(getSelectedMinValue(), getSelectedMaxValue());
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}
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break;
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}
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return true;
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}
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/**
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* Ensures correct size of the widget.
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*/
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int width = 200;
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if (MeasureSpec.UNSPECIFIED != MeasureSpec.getMode(widthMeasureSpec)) {
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width = MeasureSpec.getSize(widthMeasureSpec);
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}
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int height = thumbImage.getHeight();
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if (MeasureSpec.UNSPECIFIED != MeasureSpec.getMode(heightMeasureSpec)) {
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height = Math.min(height, MeasureSpec.getSize(heightMeasureSpec));
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}
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setMeasuredDimension(width, height);
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}
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/**
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* Draws the widget on the given canvas.
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*/
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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// draw seek bar background line
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final RectF rect = new RectF(padding, 0.5f * (getHeight() - lineHeight), getWidth() - padding, 0.5f * (getHeight() + lineHeight));
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paint.setStyle(Style.FILL);
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paint.setColor(Color.GRAY);
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canvas.drawRect(rect, paint);
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// draw seek bar active range line
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rect.left = convertToScreenValue(normalizedMinValue);
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rect.right = convertToScreenValue(normalizedMaxValue);
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// orange color
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paint.setColor(Color.rgb(255, 165, 0));
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canvas.drawRect(rect, paint);
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// draw minimum thumb
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drawThumb(convertToScreenValue(normalizedMinValue), Thumb.MIN == pressedThumb, canvas);
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// draw maximum thumb
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drawThumb(convertToScreenValue(normalizedMaxValue), Thumb.MAX == pressedThumb, canvas);
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}
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/**
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* Draws the "normal" resp. "pressed" thumb image on specified x-coordinate.
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*
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* @param normalizedToScreenValue The x-coordinate in screen space where to draw the image.
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* @param pressed Is the thumb currently in "pressed" state?
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* @param canvas The canvas to draw upon.
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*/
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private void drawThumb(float normalizedToScreenValue, boolean pressed, Canvas canvas) {
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canvas.drawBitmap(pressed ? thumbPressedImage : thumbImage, normalizedToScreenValue - thumbHalfWidth, (float) ((0.5f * getHeight()) - thumbHalfHeight), paint);
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}
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/**
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* Decides which (if any) thumb is touched by the given x-coordinate.
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*
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* @param touchX The x-coordinate of a touch event in screen space.
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* @return The pressed thumb or null if none has been touched.
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*/
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private Thumb evalPressedThumb(float touchX) {
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Thumb result = null;
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boolean minThumbPressed = isInThumbRange(touchX, normalizedMinValue);
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boolean maxThumbPressed = isInThumbRange(touchX, normalizedMaxValue);
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if (minThumbPressed && maxThumbPressed) {
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// 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.
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result = (touchX / getWidth() > 0.5f) ? Thumb.MIN : Thumb.MAX;
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} else if (minThumbPressed) {
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result = Thumb.MIN;
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} else if (maxThumbPressed) {
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result = Thumb.MAX;
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}
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return result;
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}
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/**
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* Decides if given x-coordinate in screen space needs to be interpreted as "within" the normalized thumb x-coordinate.
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*
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* @param touchX The x-coordinate in screen space to check.
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* @param normalizedThumbValue The normalized x-coordinate of the thumb to check.
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* @return true if x-coordinate is in thumb range, false otherwise.
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*/
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private boolean isInThumbRange(float touchX, double normalizedThumbValue) {
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return Math.abs(touchX - convertToScreenValue(normalizedThumbValue)) <= thumbHalfWidth;
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}
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/**
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* Sets normalized min value to value so that 0 <= value <= normalized max value <= 1.
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* The View will get invalidated when calling this method.
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*
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* @param value The new normalized min value to set.
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*/
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private void setNormalizedMinValue(double value) {
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normalizedMinValue = Math.max(0d, Math.min(1d, Math.min(value, normalizedMaxValue)));
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invalidate();
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}
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/**
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||||||
|
* 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");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
Loading…
Reference in New Issue
Block a user